{"id":303906,"date":"2020-05-20T09:00:34","date_gmt":"2020-05-20T09:00:34","guid":{"rendered":"http:\/\/savepearlharbor.com\/?p=303906"},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-29T21:00:00","slug":"","status":"publish","type":"post","link":"https:\/\/savepearlharbor.com\/?p=303906","title":{"rendered":"[\u0427\u0430\u0441\u0442\u044c 2\/2] \u0420\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u043e \u043f\u043e FFmpeg \u0438 SDL \u0438\u043b\u0438 \u041a\u0430\u043a \u043d\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u0432\u0438\u0434\u0435\u043e\u043f\u043b\u0435\u0435\u0440 \u043c\u0435\u043d\u0435\u0435 \u0447\u0435\u043c \u0432 1000 \u0441\u0442\u0440\u043e\u043a"},"content":{"rendered":"\n
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<\/a>
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\u0418 \u0445\u043e\u0442\u044f \u043c\u044b \u0441\u0442\u0430\u0440\u0430\u043b\u0438\u0441\u044c, \u0432 \u0442\u0430\u043a\u043e\u043c \u043e\u0431\u044a\u0451\u043c\u043d\u043e\u043c \u0442\u0435\u043a\u0441\u0442\u0435 \u043d\u0435\u0438\u0437\u0431\u0435\u0436\u043d\u044b \u0442\u0440\u0443\u0434\u043d\u043e\u0441\u0442\u0438 \u043f\u0435\u0440\u0435\u0432\u043e\u0434\u0430<\/i>. \u0421\u043e\u043e\u0431\u0449\u0430\u0439\u0442\u0435 \u043e \u043d\u0435\u0434\u043e\u0447\u0451\u0442\u0430\u0445 (\u0436\u0435\u043b\u0430\u0442\u0435\u043b\u044c\u043d\u043e, \u0432 \u043b\u0438\u0447\u043d\u044b\u0445 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f\u0445) \u2014 \u0432\u043c\u0435\u0441\u0442\u0435 \u0441\u0434\u0435\u043b\u0430\u0435\u043c \u043b\u0443\u0447\u0448\u0435.<\/a><\/p>\n

\u041e\u0433\u043b\u0430\u0432\u043b\u0435\u043d\u0438\u0435<\/h3>\n
\n\n\n\n
\u0427\u0430\u0441\u0442\u044c 1<\/a><\/th>\n\u0427\u0430\u0441\u0442\u044c 2<\/th>\n<\/tr>\n
\u041f\u0440\u0435\u0434\u0438\u0441\u043b\u043e\u0432\u0438\u0435
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\u0423\u0440\u043e\u043a 2: \u0412\u044b\u0432\u043e\u0434 \u043d\u0430 \u044d\u043a\u0440\u0430\u043d
\u0423\u0440\u043e\u043a 3: \u0412\u043e\u0441\u043f\u0440\u043e\u0438\u0437\u0432\u0435\u0434\u0435\u043d\u0438\u0435 \u0437\u0432\u0443\u043a\u0430
\u0423\u0440\u043e\u043a 4: \u041c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u0435 \u0442\u0440\u0435\u0434\u044b
\u0423\u0440\u043e\u043a 5: \u0421\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0430\u0446\u0438\u044f \u0432\u0438\u0434\u0435\u043e <\/td>\n		\u0423\u0440\u043e\u043a 6: \u0421\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0430\u0446\u0438\u044f \u0430\u0443\u0434\u0438\u043e<\/a>
\u0423\u0440\u043e\u043a 7: \u041f\u043e\u0438\u0441\u043a<\/a>
\u041f\u043e\u0441\u043b\u0435\u0441\u043b\u043e\u0432\u0438\u0435<\/a>
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\u041f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0435 2. \u0421\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b \u0434\u0430\u043d\u043d\u044b\u0445<\/a>
\u0421\u0441\u044b\u043b\u043a\u0438<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

<\/a>
<\/a><\/p>\n

\"EDISON<\/a>
\u0421\u0442\u0430\u0442\u044c\u044f \u043f\u0435\u0440\u0435\u0432\u0435\u0434\u0435\u043d\u0430 \u043f\u0440\u0438 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0435 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 EDISON.<\/p>\n

\u0421\u0440\u0435\u0434\u0438 \u043d\u0430\u0448\u0438\u0445 \u0440\u0430\u0431\u043e\u0442 \u043c\u043d\u043e\u0433\u043e \u0442\u0430\u043a\u0438\u0445, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0441\u0432\u044f\u0437\u0430\u043d\u044b \u0441\u043e \u0441\u043b\u043e\u0436\u043d\u043e\u0439 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 \u0432\u0438\u0434\u0435\u043e.<\/p>\n

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\u041c\u044b \u043b\u044e\u0431\u0438\u043c \u0438 \u0443\u043c\u0435\u0435\u043c \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u0441 \u0432\u0438\u0434\u0435\u043e! \ud83d\ude09<\/p><\/blockquote>\n

<\/p>\n

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<\/p>\n

\u041f\u043e\u043b\u043d\u044b\u0439 \u043b\u0438\u0441\u0442\u0438\u043d\u0433 tutorial06.c<\/b> <\/p>\n
\n
\/\/ tutorial05.c \/\/ A pedagogical video player that really works! \/\/ \/\/ Code based on FFplay, Copyright (c) 2003 Fabrice Bellard,  \/\/ and a tutorial by Martin Bohme (boehme@inb.uni-luebeckREMOVETHIS.de) \/\/ Tested on Gentoo, CVS version 5\/01\/07 compiled with GCC 4.1.1 \/\/ With updates from https:\/\/github.com\/chelyaev\/ffmpeg-tutorial \/\/ Updates tested on: \/\/ LAVC 54.59.100, LAVF 54.29.104, LSWS 2.1.101, SDL 1.2.15 \/\/ on GCC 4.7.2 in Debian February 2015 \/\/ Use \/\/ \/\/ gcc -o tutorial05 tutorial05.c -lavformat -lavcodec -lswscale -lz -lm `sdl-config --cflags --libs` \/\/ to build (assuming libavformat and libavcodec are correctly installed,  \/\/ and assuming you have sdl-config. Please refer to SDL docs for your installation.) \/\/ \/\/ Run using \/\/ tutorial04 myvideofile.mpg \/\/ \/\/ to play the video stream on your screen.  #include <libavcodec\/avcodec.h> #include <libavformat\/avformat.h> #include <libswscale\/swscale.h>  #include <SDL.h> #include <SDL_thread.h>  #ifdef __MINGW32__ #undef main \/* Prevents SDL from overriding main() *\/ #endif  #include <stdio.h> #include <assert.h> #include <math.h>  \/\/ compatibility with newer API #if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(55,28,1) #define av_frame_alloc avcodec_alloc_frame #define av_frame_free avcodec_free_frame #endif  #define SDL_AUDIO_BUFFER_SIZE 1024 #define MAX_AUDIO_FRAME_SIZE 192000  #define MAX_AUDIOQ_SIZE (5 * 16 * 1024) #define MAX_VIDEOQ_SIZE (5 * 256 * 1024)  #define AV_SYNC_THRESHOLD 0.01 #define AV_NOSYNC_THRESHOLD 10.0  #define SAMPLE_CORRECTION_PERCENT_MAX 10 #define AUDIO_DIFF_AVG_NB 20  #define FF_REFRESH_EVENT (SDL_USEREVENT) #define FF_QUIT_EVENT (SDL_USEREVENT + 1)  #define VIDEO_PICTURE_QUEUE_SIZE 1  #define DEFAULT_AV_SYNC_TYPE AV_SYNC_VIDEO_MASTER  typedef struct PacketQueue {   AVPacketList *first_pkt, *last_pkt;   int nb_packets;   int size;   SDL_mutex *mutex;   SDL_cond *cond; } PacketQueue;   typedef struct VideoPicture {   SDL_Overlay *bmp;   int width, height; \/* source height & width *\/   int allocated;   double pts; } VideoPicture;  typedef struct VideoState {    AVFormatContext *pFormatCtx;   int             videoStream, audioStream;    int             av_sync_type;   double          external_clock; \/* external clock base *\/   int64_t         external_clock_time;    double          audio_clock;   AVStream        *audio_st;   AVCodecContext  *audio_ctx;   PacketQueue     audioq;   uint8_t         audio_buf[(AVCODEC_MAX_AUDIO_FRAME_SIZE * 3) \/ 2];   unsigned int    audio_buf_size;   unsigned int    audio_buf_index;   AVFrame         audio_frame;   AVPacket        audio_pkt;   uint8_t         *audio_pkt_data;   int             audio_pkt_size;   int             audio_hw_buf_size;   double          audio_diff_cum; \/* used for AV difference average computation *\/   double          audio_diff_avg_coef;   double          audio_diff_threshold;   int             audio_diff_avg_count;   double          frame_timer;   double          frame_last_pts;   double          frame_last_delay;   double          video_clock; \/\/\/<pts of last decoded frame \/ predicted pts of next decoded frame   double          video_current_pts; \/\/\/<current displayed pts (different from video_clock if frame fifos are used)   int64_t         video_current_pts_time;  \/\/\/<time (av_gettime) at which we updated video_current_pts - used to have running video pts   AVStream        *video_st;   AVCodecContext  *video_ctx;   PacketQueue     videoq;   struct SwsContext *sws_ctx;    VideoPicture    pictq[VIDEO_PICTURE_QUEUE_SIZE];   int             pictq_size, pictq_rindex, pictq_windex;   SDL_mutex       *pictq_mutex;   SDL_cond        *pictq_cond;      SDL_Thread      *parse_tid;   SDL_Thread      *video_tid;    char            filename[1024];   int             quit; } VideoState;  enum {   AV_SYNC_AUDIO_MASTER,   AV_SYNC_VIDEO_MASTER,   AV_SYNC_EXTERNAL_MASTER, };  SDL_Surface     *screen; SDL_mutex       *screen_mutex;  \/* Since we only have one decoding thread, the Big Struct    can be global in case we need it. *\/ VideoState *global_video_state;  void packet_queue_init(PacketQueue *q) {   memset(q, 0, sizeof(PacketQueue));   q->mutex = SDL_CreateMutex();   q->cond = SDL_CreateCond(); } int packet_queue_put(PacketQueue *q, AVPacket *pkt) {    AVPacketList *pkt1;   if(av_dup_packet(pkt) < 0) {     return -1;   }   pkt1 = av_malloc(sizeof(AVPacketList));   if (!pkt1)     return -1;   pkt1->pkt = *pkt;   pkt1->next = NULL;      SDL_LockMutex(q->mutex);    if (!q->last_pkt)     q->first_pkt = pkt1;   else     q->last_pkt->next = pkt1;   q->last_pkt = pkt1;   q->nb_packets++;   q->size += pkt1->pkt.size;   SDL_CondSignal(q->cond);      SDL_UnlockMutex(q->mutex);   return 0; } static int packet_queue_get(PacketQueue *q, AVPacket *pkt, int block) {   AVPacketList *pkt1;   int ret;    SDL_LockMutex(q->mutex);      for(;;) {          if(global_video_state->quit) {       ret = -1;       break;     }      pkt1 = q->first_pkt;     if (pkt1) {       q->first_pkt = pkt1->next;       if (!q->first_pkt) \tq->last_pkt = NULL;       q->nb_packets--;       q->size -= pkt1->pkt.size;       *pkt = pkt1->pkt;       av_free(pkt1);       ret = 1;       break;     } else if (!block) {       ret = 0;       break;     } else {       SDL_CondWait(q->cond, q->mutex);     }   }   SDL_UnlockMutex(q->mutex);   return ret; }  double get_audio_clock(VideoState *is) {   double pts;   int hw_buf_size, bytes_per_sec, n;      pts = is->audio_clock; \/* maintained in the audio thread *\/   hw_buf_size = is->audio_buf_size - is->audio_buf_index;   bytes_per_sec = 0;   n = is->audio_ctx->channels * 2;   if(is->audio_st) {     bytes_per_sec = is->audio_ctx->sample_rate * n;   }   if(bytes_per_sec) {     pts -= (double)hw_buf_size \/ bytes_per_sec;   }   return pts; } double get_video_clock(VideoState *is) {   double delta;    delta = (av_gettime() - is->video_current_pts_time) \/ 1000000.0;   return is->video_current_pts + delta; } double get_external_clock(VideoState *is) {   return av_gettime() \/ 1000000.0; }  double get_master_clock(VideoState *is) {   if(is->av_sync_type == AV_SYNC_VIDEO_MASTER) {     return get_video_clock(is);   } else if(is->av_sync_type == AV_SYNC_AUDIO_MASTER) {     return get_audio_clock(is);   } else {     return get_external_clock(is);   } }   \/* Add or subtract samples to get a better sync, return new    audio buffer size *\/ int synchronize_audio(VideoState *is, short *samples, \t\t      int samples_size, double pts) {   int n;   double ref_clock;    n = 2 * is->audio_ctx->channels;      if(is->av_sync_type != AV_SYNC_AUDIO_MASTER) {     double diff, avg_diff;     int wanted_size, min_size, max_size \/*, nb_samples *\/;          ref_clock = get_master_clock(is);     diff = get_audio_clock(is) - ref_clock;      if(diff < AV_NOSYNC_THRESHOLD) {       \/\/ accumulate the diffs       is->audio_diff_cum = diff + is->audio_diff_avg_coef \t* is->audio_diff_cum;       if(is->audio_diff_avg_count < AUDIO_DIFF_AVG_NB) { \tis->audio_diff_avg_count++;       } else { \tavg_diff = is->audio_diff_cum * (1.0 - is->audio_diff_avg_coef); \tif(fabs(avg_diff) >= is->audio_diff_threshold) { \t  wanted_size = samples_size + ((int)(diff * is->audio_ctx->sample_rate) * n); \t  min_size = samples_size * ((100 - SAMPLE_CORRECTION_PERCENT_MAX) \/ 100); \t  max_size = samples_size * ((100 + SAMPLE_CORRECTION_PERCENT_MAX) \/ 100); \t  if(wanted_size < min_size) { \t    wanted_size = min_size; \t  } else if (wanted_size > max_size) { \t    wanted_size = max_size; \t  } \t  if(wanted_size < samples_size) { \t    \/* remove samples *\/ \t    samples_size = wanted_size; \t  } else if(wanted_size > samples_size) { \t    uint8_t *samples_end, *q; \t    int nb;  \t    \/* add samples by copying final sample*\/ \t    nb = (samples_size - wanted_size); \t    samples_end = (uint8_t *)samples + samples_size - n; \t    q = samples_end + n; \t    while(nb > 0) { \t      memcpy(q, samples_end, n); \t      q += n; \t      nb -= n; \t    } \t    samples_size = wanted_size; \t  } \t}       }     } else {       \/* difference is TOO big; reset diff stuff *\/       is->audio_diff_avg_count = 0;       is->audio_diff_cum = 0;     }   }   return samples_size; }  int audio_decode_frame(VideoState *is, uint8_t *audio_buf, int buf_size, double *pts_ptr) {    int len1, data_size = 0;   AVPacket *pkt = &is->audio_pkt;   double pts;   int n;    for(;;) {     while(is->audio_pkt_size > 0) {       int got_frame = 0;       len1 = avcodec_decode_audio4(is->audio_ctx, &is->audio_frame, &got_frame, pkt);       if(len1 < 0) { \t\/* if error, skip frame *\/ \tis->audio_pkt_size = 0; \tbreak;       }       data_size = 0;       if(got_frame) { \tdata_size = av_samples_get_buffer_size(NULL,  \t\t\t\t\t       is->audio_ctx->channels, \t\t\t\t\t       is->audio_frame.nb_samples, \t\t\t\t\t       is->audio_ctx->sample_fmt, \t\t\t\t\t       1); \tassert(data_size <= buf_size); \tmemcpy(audio_buf, is->audio_frame.data[0], data_size);       }       is->audio_pkt_data += len1;       is->audio_pkt_size -= len1;       if(data_size <= 0) { \t\/* No data yet, get more frames *\/ \tcontinue;       }       pts = is->audio_clock;       *pts_ptr = pts;       n = 2 * is->audio_ctx->channels;       is->audio_clock += (double)data_size \/ \t(double)(n * is->audio_ctx->sample_rate);       \/* We have data, return it and come back for more later *\/       return data_size;     }     if(pkt->data)       av_free_packet(pkt);      if(is->quit) {       return -1;     }     \/* next packet *\/     if(packet_queue_get(&is->audioq, pkt, 1) < 0) {       return -1;     }     is->audio_pkt_data = pkt->data;     is->audio_pkt_size = pkt->size;     \/* if update, update the audio clock w\/pts *\/     if(pkt->pts != AV_NOPTS_VALUE) {       is->audio_clock = av_q2d(is->audio_st->time_base)*pkt->pts;     }   } }  void audio_callback(void *userdata, Uint8 *stream, int len) {    VideoState *is = (VideoState *)userdata;   int len1, audio_size;   double pts;    while(len > 0) {     if(is->audio_buf_index >= is->audio_buf_size) {       \/* We have already sent all our data; get more *\/       audio_size = audio_decode_frame(is, is->audio_buf, sizeof(is->audio_buf), &pts);       if(audio_size < 0) { \t\/* If error, output silence *\/ \tis->audio_buf_size = 1024; \tmemset(is->audio_buf, 0, is->audio_buf_size);       } else { \taudio_size = synchronize_audio(is, (int16_t *)is->audio_buf, \t\t\t\t       audio_size, pts); \tis->audio_buf_size = audio_size;       }       is->audio_buf_index = 0;     }     len1 = is->audio_buf_size - is->audio_buf_index;     if(len1 > len)       len1 = len;     memcpy(stream, (uint8_t *)is->audio_buf + is->audio_buf_index, len1);     len -= len1;     stream += len1;     is->audio_buf_index += len1;   } }  static Uint32 sdl_refresh_timer_cb(Uint32 interval, void *opaque) {   SDL_Event event;   event.type = FF_REFRESH_EVENT;   event.user.data1 = opaque;   SDL_PushEvent(&event);   return 0; \/* 0 means stop timer *\/ }  \/* schedule a video refresh in 'delay' ms *\/ static void schedule_refresh(VideoState *is, int delay) {   SDL_AddTimer(delay, sdl_refresh_timer_cb, is); }  void video_display(VideoState *is) {    SDL_Rect rect;   VideoPicture *vp;   float aspect_ratio;   int w, h, x, y;   int i;    vp = &is->pictq[is->pictq_rindex];   if(vp->bmp) {     if(is->video_ctx->sample_aspect_ratio.num == 0) {       aspect_ratio = 0;     } else {       aspect_ratio = av_q2d(is->video_ctx->sample_aspect_ratio) * \tis->video_ctx->width \/ is->video_ctx->height;     }     if(aspect_ratio <= 0.0) {       aspect_ratio = (float)is->video_ctx->width \/ \t(float)is->video_ctx->height;     }     h = screen->h;     w = ((int)rint(h * aspect_ratio)) & -3;     if(w > screen->w) {       w = screen->w;       h = ((int)rint(w \/ aspect_ratio)) & -3;     }     x = (screen->w - w) \/ 2;     y = (screen->h - h) \/ 2;          rect.x = x;     rect.y = y;     rect.w = w;     rect.h = h;     SDL_LockMutex(screen_mutex);     SDL_DisplayYUVOverlay(vp->bmp, &rect);     SDL_UnlockMutex(screen_mutex);   } }  void video_refresh_timer(void *userdata) {    VideoState *is = (VideoState *)userdata;   VideoPicture *vp;   double actual_delay, delay, sync_threshold, ref_clock, diff;      if(is->video_st) {     if(is->pictq_size == 0) {       schedule_refresh(is, 1);     } else {       vp = &is->pictq[is->pictq_rindex];              is->video_current_pts = vp->pts;       is->video_current_pts_time = av_gettime();       delay = vp->pts - is->frame_last_pts; \/* the pts from last time *\/       if(delay <= 0 || delay >= 1.0) { \t\/* if incorrect delay, use previous one *\/ \tdelay = is->frame_last_delay;       }       \/* save for next time *\/       is->frame_last_delay = delay;       is->frame_last_pts = vp->pts;          \/* update delay to sync to audio if not master source *\/       if(is->av_sync_type != AV_SYNC_VIDEO_MASTER) { \tref_clock = get_master_clock(is); \tdiff = vp->pts - ref_clock; \t \t\/* Skip or repeat the frame. Take delay into account \t   FFPlay still doesn't "know if this is the best guess." *\/ \tsync_threshold = (delay > AV_SYNC_THRESHOLD) ? delay : AV_SYNC_THRESHOLD; \tif(fabs(diff) < AV_NOSYNC_THRESHOLD) { \t  if(diff <= -sync_threshold) { \t    delay = 0; \t  } else if(diff >= sync_threshold) { \t    delay = 2 * delay; \t  } \t}       }       is->frame_timer += delay;       \/* computer the REAL delay *\/       actual_delay = is->frame_timer - (av_gettime() \/ 1000000.0);       if(actual_delay < 0.010) { \t\/* Really it should skip the picture instead *\/ \tactual_delay = 0.010;       }       schedule_refresh(is, (int)(actual_delay * 1000 + 0.5));              \/* show the picture! *\/       video_display(is);              \/* update queue for next picture! *\/       if(++is->pictq_rindex == VIDEO_PICTURE_QUEUE_SIZE) { \tis->pictq_rindex = 0;       }       SDL_LockMutex(is->pictq_mutex);       is->pictq_size--;       SDL_CondSignal(is->pictq_cond);       SDL_UnlockMutex(is->pictq_mutex);     }   } else {     schedule_refresh(is, 100);   } }        void alloc_picture(void *userdata) {    VideoState *is = (VideoState *)userdata;   VideoPicture *vp;    vp = &is->pictq[is->pictq_windex];   if(vp->bmp) {     \/\/ we already have one make another, bigger\/smaller     SDL_FreeYUVOverlay(vp->bmp);   }   \/\/ Allocate a place to put our YUV image on that screen   SDL_LockMutex(screen_mutex);   vp->bmp = SDL_CreateYUVOverlay(is->video_ctx->width, \t\t\t\t is->video_ctx->height, \t\t\t\t SDL_YV12_OVERLAY, \t\t\t\t screen);   SDL_UnlockMutex(screen_mutex);    vp->width = is->video_ctx->width;   vp->height = is->video_ctx->height;   vp->allocated = 1;  }  int queue_picture(VideoState *is, AVFrame *pFrame, double pts) {    VideoPicture *vp;   int dst_pix_fmt;   AVPicture pict;    \/* wait until we have space for a new pic *\/   SDL_LockMutex(is->pictq_mutex);   while(is->pictq_size >= VIDEO_PICTURE_QUEUE_SIZE && \t!is->quit) {     SDL_CondWait(is->pictq_cond, is->pictq_mutex);   }   SDL_UnlockMutex(is->pictq_mutex);    if(is->quit)     return -1;    \/\/ windex is set to 0 initially   vp = &is->pictq[is->pictq_windex];    \/* allocate or resize the buffer! *\/   if(!vp->bmp ||      vp->width != is->video_ctx->width ||      vp->height != is->video_ctx->height) {     SDL_Event event;      vp->allocated = 0;     alloc_picture(is);     if(is->quit) {       return -1;     }   }    \/* We have a place to put our picture on the queue *\/    if(vp->bmp) {      SDL_LockYUVOverlay(vp->bmp);     vp->pts = pts;          dst_pix_fmt = PIX_FMT_YUV420P;     \/* point pict at the queue *\/      pict.data[0] = vp->bmp->pixels[0];     pict.data[1] = vp->bmp->pixels[2];     pict.data[2] = vp->bmp->pixels[1];          pict.linesize[0] = vp->bmp->pitches[0];     pict.linesize[1] = vp->bmp->pitches[2];     pict.linesize[2] = vp->bmp->pitches[1];          \/\/ Convert the image into YUV format that SDL uses     sws_scale(is->sws_ctx, (uint8_t const * const *)pFrame->data, \t      pFrame->linesize, 0, is->video_ctx->height, \t      pict.data, pict.linesize);          SDL_UnlockYUVOverlay(vp->bmp);     \/* now we inform our display thread that we have a pic ready *\/     if(++is->pictq_windex == VIDEO_PICTURE_QUEUE_SIZE) {       is->pictq_windex = 0;     }     SDL_LockMutex(is->pictq_mutex);     is->pictq_size++;     SDL_UnlockMutex(is->pictq_mutex);   }   return 0; }  double synchronize_video(VideoState *is, AVFrame *src_frame, double pts) {    double frame_delay;    if(pts != 0) {     \/* if we have pts, set video clock to it *\/     is->video_clock = pts;   } else {     \/* if we aren't given a pts, set it to the clock *\/     pts = is->video_clock;   }   \/* update the video clock *\/   frame_delay = av_q2d(is->video_ctx->time_base);   \/* if we are repeating a frame, adjust clock accordingly *\/   frame_delay += src_frame->repeat_pict * (frame_delay * 0.5);   is->video_clock += frame_delay;   return pts; }  int video_thread(void *arg) {   VideoState *is = (VideoState *)arg;   AVPacket pkt1, *packet = &pkt1;   int frameFinished;   AVFrame *pFrame;   double pts;    pFrame = av_frame_alloc();    for(;;) {     if(packet_queue_get(&is->videoq, packet, 1) < 0) {       \/\/ means we quit getting packets       break;     }     if(packet_queue_get(&is->videoq, packet, 1) < 0) {       \/\/ means we quit getting packets       break;     }     pts = 0;      \/\/ Decode video frame     avcodec_decode_video2(is->video_ctx, pFrame, &frameFinished, packet);      if((pts = av_frame_get_best_effort_timestamp(pFrame)) == AV_NOPTS_VALUE) {     } else {       pts = 0;     }     pts *= av_q2d(is->video_st->time_base);      \/\/ Did we get a video frame?     if(frameFinished) {       pts = synchronize_video(is, pFrame, pts);       if(queue_picture(is, pFrame, pts) < 0) { \tbreak;       }     }     av_free_packet(packet);   }   av_frame_free(&pFrame);   return 0; }  int stream_component_open(VideoState *is, int stream_index) {    AVFormatContext *pFormatCtx = is->pFormatCtx;   AVCodecContext *codecCtx = NULL;   AVCodec *codec = NULL;   SDL_AudioSpec wanted_spec, spec;    if(stream_index < 0 || stream_index >= pFormatCtx->nb_streams) {     return -1;   }    codec = avcodec_find_decoder(pFormatCtx->streams[stream_index]->codec->codec_id);   if(!codec) {     fprintf(stderr, "Unsupported codec!\\n");     return -1;   }    codecCtx = avcodec_alloc_context3(codec);   if(avcodec_copy_context(codecCtx, pFormatCtx->streams[stream_index]->codec) != 0) {     fprintf(stderr, "Couldn't copy codec context");     return -1; \/\/ Error copying codec context   }     if(codecCtx->codec_type == AVMEDIA_TYPE_AUDIO) {     \/\/ Set audio settings from codec info     wanted_spec.freq = codecCtx->sample_rate;     wanted_spec.format = AUDIO_S16SYS;     wanted_spec.channels = codecCtx->channels;     wanted_spec.silence = 0;     wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE;     wanted_spec.callback = audio_callback;     wanted_spec.userdata = is;          if(SDL_OpenAudio(&wanted_spec, &spec) < 0) {       fprintf(stderr, "SDL_OpenAudio: %s\\n", SDL_GetError());       return -1;     }     is->audio_hw_buf_size = spec.size;   }   if(avcodec_open2(codecCtx, codec, NULL) < 0) {     fprintf(stderr, "Unsupported codec!\\n");     return -1;   }    switch(codecCtx->codec_type) {   case AVMEDIA_TYPE_AUDIO:     is->audioStream = stream_index;     is->audio_st = pFormatCtx->streams[stream_index];     is->audio_ctx = codecCtx;     is->audio_buf_size = 0;     is->audio_buf_index = 0;     memset(&is->audio_pkt, 0, sizeof(is->audio_pkt));     packet_queue_init(&is->audioq);     SDL_PauseAudio(0);     break;   case AVMEDIA_TYPE_VIDEO:     is->videoStream = stream_index;     is->video_st = pFormatCtx->streams[stream_index];     is->video_ctx = codecCtx;      is->frame_timer = (double)av_gettime() \/ 1000000.0;     is->frame_last_delay = 40e-3;     is->video_current_pts_time = av_gettime();      packet_queue_init(&is->videoq);     is->video_tid = SDL_CreateThread(video_thread, is);     is->sws_ctx = sws_getContext(is->video_ctx->width, is->video_ctx->height, \t\t\t\t is->video_ctx->pix_fmt, is->video_ctx->width, \t\t\t\t is->video_ctx->height, PIX_FMT_YUV420P, \t\t\t\t SWS_BILINEAR, NULL, NULL, NULL \t\t\t\t );     break;   default:     break;   } }  int decode_thread(void *arg) {    VideoState *is = (VideoState *)arg;   AVFormatContext *pFormatCtx;   AVPacket pkt1, *packet = &pkt1;    int video_index = -1;   int audio_index = -1;   int i;    is->videoStream=-1;   is->audioStream=-1;    global_video_state = is;    \/\/ Open video file   if(avformat_open_input(&pFormatCtx, is->filename, NULL, NULL)!=0)     return -1; \/\/ Couldn't open file    is->pFormatCtx = pFormatCtx;      \/\/ Retrieve stream information   if(avformat_find_stream_info(pFormatCtx, NULL)<0)     return -1; \/\/ Couldn't find stream information      \/\/ Dump information about file onto standard error   av_dump_format(pFormatCtx, 0, is->filename, 0);      \/\/ Find the first video stream    for(i=0; i<pFormatCtx->nb_streams; i++) {     if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO &&        video_index < 0) {       video_index=i;     }     if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO &&        audio_index < 0) {       audio_index=i;     }   }   if(audio_index >= 0) {     stream_component_open(is, audio_index);   }   if(video_index >= 0) {     stream_component_open(is, video_index);   }       if(is->videoStream < 0 || is->audioStream < 0) {     fprintf(stderr, "%s: could not open codecs\\n", is->filename);     goto fail;   }    \/\/ main decode loop    for(;;) {     if(is->quit) {       break;     }     \/\/ seek stuff goes here     if(is->audioq.size > MAX_AUDIOQ_SIZE ||        is->videoq.size > MAX_VIDEOQ_SIZE) {       SDL_Delay(10);       continue;     }     if(av_read_frame(is->pFormatCtx, packet) < 0) {       if(is->pFormatCtx->pb->error == 0) { \tSDL_Delay(100); \/* no error; wait for user input *\/ \tcontinue;       } else { \tbreak;       }     }     \/\/ Is this a packet from the video stream?     if(packet->stream_index == is->videoStream) {       packet_queue_put(&is->videoq, packet);     } else if(packet->stream_index == is->audioStream) {       packet_queue_put(&is->audioq, packet);     } else {       av_free_packet(packet);     }   }   \/* all done - wait for it *\/   while(!is->quit) {     SDL_Delay(100);   }   fail:   if(1){     SDL_Event event;     event.type = FF_QUIT_EVENT;     event.user.data1 = is;     SDL_PushEvent(&event);   }   return 0; }  int main(int argc, char *argv[]) {    SDL_Event       event;    VideoState      *is;    is = av_mallocz(sizeof(VideoState));    if(argc < 2) {     fprintf(stderr, "Usage: test <file>\\n");     exit(1);   }   \/\/ Register all formats and codecs   av_register_all();      if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {     fprintf(stderr, "Could not initialize SDL - %s\\n", SDL_GetError());     exit(1);   }    \/\/ Make a screen to put our video #ifndef __DARWIN__         screen = SDL_SetVideoMode(640, 480, 0, 0); #else         screen = SDL_SetVideoMode(640, 480, 24, 0); #endif   if(!screen) {     fprintf(stderr, "SDL: could not set video mode - exiting\\n");     exit(1);   }    screen_mutex = SDL_CreateMutex();    av_strlcpy(is->filename, argv[1], sizeof(is->filename));    is->pictq_mutex = SDL_CreateMutex();   is->pictq_cond = SDL_CreateCond();    schedule_refresh(is, 40);    is->av_sync_type = DEFAULT_AV_SYNC_TYPE;   is->parse_tid = SDL_CreateThread(decode_thread, is);   if(!is->parse_tid) {     av_free(is);     return -1;   }   for(;;) {      SDL_WaitEvent(&event);     switch(event.type) {     case FF_QUIT_EVENT:     case SDL_QUIT:       is->quit = 1;       SDL_Quit();       return 0;       break;     case FF_REFRESH_EVENT:       video_refresh_timer(event.user.data1);       break;     default:       break;     }   }   return 0; }<\/code><\/pre>\n<\/div><\/div>\n
  <\/p>\n
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  \u0422\u0435\u043f\u0435\u0440\u044c, \u043a\u043e\u0433\u0434\u0430 \u0443 \u043d\u0430\u0441 \u0435\u0441\u0442\u044c \u0431\u043e\u043b\u0435\u0435-\u043c\u0435\u043d\u0435\u0435 \u043f\u0440\u0438\u0441\u0442\u043e\u0439\u043d\u044b\u0439 \u043f\u043b\u0435\u0435\u0440, \u043d\u0430 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0434\u0430\u0436\u0435 \u043c\u043e\u0436\u043d\u043e \u043f\u043e\u0433\u043b\u044f\u0434\u0435\u0442\u044c \u043a\u0438\u043d\u043e, \u0434\u0430\u0432\u0430\u0439\u0442\u0435 \u0441\u0432\u0435\u0434\u0451\u043c \u0442\u0435\u043f\u0435\u0440\u044c \u043a\u043e\u043d\u0446\u044b \u0441 \u043a\u043e\u043d\u0446\u0430\u043c\u0438. \u0412 \u043f\u0440\u043e\u0448\u043b\u044b\u0439 \u0440\u0430\u0437 \u043c\u044b \u0441\u043b\u0435\u0433\u043a\u0430 \u043a\u043e\u0441\u043d\u0443\u043b\u0438\u0441\u044c \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0430\u0446\u0438\u0438, \u0430 \u0438\u043c\u0435\u043d\u043d\u043e \u2014 \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0430\u0446\u0438\u044f \u0437\u0432\u0443\u043a\u0430 \u0441 \u0432\u0438\u0434\u0435\u043e, \u0438\u043c\u0435\u043d\u043d\u043e \u0432 \u0442\u0430\u043a\u043e\u043c \u043f\u043e\u0440\u044f\u0434\u043a\u0435, \u043d\u0435 \u043d\u0430\u043e\u0431\u043e\u0440\u043e\u0442. \u041c\u044b \u0441\u043e\u0431\u0438\u0440\u0430\u0435\u043c\u0441\u044f \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u044d\u0442\u043e \u0442\u0430\u043a\u0438\u043c \u0436\u0435 \u043c\u0430\u043a\u0430\u0440\u043e\u043c, \u043a\u0430\u043a \u0438 \u0441 \u0432\u0438\u0434\u0435\u043e: \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0438\u0435 \u0432\u0438\u0434\u0435\u043e\u0447\u0430\u0441\u044b, \u0447\u0442\u043e\u0431\u044b \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u0442\u044c, \u043a\u0430\u043a \u0434\u0430\u043b\u0435\u043a\u043e \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u0432\u0438\u0434\u0435\u043e\u043f\u043e\u0442\u043e\u043a, \u0438 \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0441 \u043d\u0438\u043c \u0430\u0443\u0434\u0438\u043e. \u041f\u043e\u0437\u0436\u0435 \u043c\u044b \u0435\u0449\u0451 \u0431\u043e\u043b\u0435\u0435 \u043e\u0431\u043e\u0431\u0449\u0438\u043c \u2014 \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0438\u0440\u0443\u0435\u043c \u0430\u0443\u0434\u0438\u043e \u0438 \u0432\u0438\u0434\u0435\u043e \u0441 \u0432\u043d\u0435\u0448\u043d\u0438\u043c\u0438 \u0447\u0430\u0441\u0430\u043c\u0438.<\/p>\n
\u0420\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f \u0432\u0438\u0434\u0435\u043e\u0447\u0430\u0441\u043e\u0432<\/h3>\n
  \u0422\u0435\u043f\u0435\u0440\u044c \u043c\u044b \u0445\u043e\u0442\u0438\u043c \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u0432\u0438\u0434\u0435\u043e\u0447\u0430\u0441\u044b, \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0447\u043d\u044b\u0435 \u0430\u0443\u0434\u0438\u043e\u0447\u0430\u0441\u0430\u043c, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0431\u044b\u043b\u0438 \u0443 \u043d\u0430\u0441 \u0432 \u043f\u0440\u043e\u0448\u043b\u044b\u0439 \u0440\u0430\u0437: \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0435\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442 \u0442\u0435\u043a\u0443\u0449\u0435\u0435 \u0441\u043c\u0435\u0449\u0435\u043d\u0438\u0435 \u0432\u0440\u0435\u043c\u0435\u043d\u0438 \u0432\u043e\u0441\u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u043c\u043e\u0433\u043e \u0432 \u0434\u0430\u043d\u043d\u044b\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 \u0432\u0438\u0434\u0435\u043e. \u041c\u043e\u0436\u043d\u043e \u043f\u043e\u0434\u0443\u043c\u0430\u0442\u044c, \u0447\u0442\u043e \u044d\u0442\u043e \u0431\u0443\u0434\u0435\u0442 \u0442\u0430\u043a \u0436\u0435 \u043f\u0440\u043e\u0441\u0442\u043e, \u043a\u0430\u043a \u043e\u0431\u043d\u043e\u0432\u0438\u0442\u044c \u0442\u0430\u0439\u043c\u0435\u0440 \u0442\u0435\u043a\u0443\u0449\u0438\u043c PTS<\/b> \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0433\u043e \u043e\u0442\u043e\u0431\u0440\u0430\u0436\u0430\u0435\u043c\u043e\u0433\u043e \u043a\u0430\u0434\u0440\u0430. \u041e\u0434\u043d\u0430\u043a\u043e \u043d\u0435 \u0437\u0430\u0431\u044b\u0432\u0430\u0439\u0442\u0435, \u0447\u0442\u043e \u0432\u0440\u0435\u043c\u044f \u043c\u0435\u0436\u0434\u0443 \u0432\u0438\u0434\u0435\u043e\u043a\u0430\u0434\u0440\u0430\u043c\u0438 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0441\u043b\u0438\u0448\u043a\u043e\u043c \u0431\u043e\u043b\u044c\u0448\u0438\u043c, \u0435\u0441\u043b\u0438 \u043c\u044b \u043e\u043f\u0443\u0441\u043a\u0430\u0435\u043c\u0441\u044f \u0434\u043e \u043c\u0438\u043b\u043b\u0438\u0441\u0435\u043a\u0443\u043d\u0434\u043d\u043e\u0433\u043e \u0443\u0440\u043e\u0432\u043d\u044f. \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u0440\u0435\u0448\u0435\u043d\u0438\u0435 \u0437\u0430\u043a\u043b\u044e\u0447\u0430\u0435\u0442\u0441\u044f \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e\u0431\u044b \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u0442\u044c \u0434\u0440\u0443\u0433\u043e\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435, \u0432\u0440\u0435\u043c\u044f, \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u043c\u044b \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0435\u043c \u0432\u0438\u0434\u0435\u043e\u0447\u0430\u0441\u044b \u043d\u0430 PTS<\/b> \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0433\u043e \u043a\u0430\u0434\u0440\u0430. \u0422\u0430\u043a\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c, \u0442\u0435\u043a\u0443\u0449\u0435\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0432\u0438\u0434\u0435\u043e\u0447\u0430\u0441\u043e\u0432 \u0431\u0443\u0434\u0435\u0442 PTS_of_last_frame<\/b> + (current_time<\/b> \u2014 time_elapsed_since_PTS_value_was_set<\/b>). \u042d\u0442\u043e \u0440\u0435\u0448\u0435\u043d\u0438\u0435 \u043e\u0447\u0435\u043d\u044c \u043f\u043e\u0445\u043e\u0436\u0435 \u043d\u0430 \u0442\u043e, \u0447\u0442\u043e \u043c\u044b \u0441\u0434\u0435\u043b\u0430\u043b\u0438 \u0441 get_audio_clock<\/b>.<\/p>\n
  \u0418\u0442\u0430\u043a, \u0432 \u043d\u0430\u0448\u0443 \u043f\u043e\u043b\u043d\u043e\u043c\u0430\u0441\u0448\u0442\u0430\u0431\u043d\u0443\u044e \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0443 \u043c\u044b \u0441\u043e\u0431\u0438\u0440\u0430\u0435\u043c\u0441\u044f \u043f\u043e\u043c\u0435\u0441\u0442\u0438\u0442\u044c double video_current_pts<\/b> \u0438 int64_t video_current_pts_time<\/b>. \u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u0447\u0430\u0441\u043e\u0432 \u0431\u0443\u0434\u0435\u0442 \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442\u044c \u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 video_refresh_timer<\/b>:<\/p>\n
void video_refresh_timer(void *userdata) {    \/* ... *\/    if(is->video_st) {     if(is->pictq_size == 0) {       schedule_refresh(is, 1);     } else {       vp = &is->pictq[is->pictq_rindex];        is->video_current_pts = vp->pts;       is->video_current_pts_time = av_gettime();<\/code><\/pre>\n
  \u041d\u0435 \u0437\u0430\u0431\u044b\u0432\u0430\u0435\u043c \u0438\u043d\u0438\u0446\u0438\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0435\u0433\u043e \u0432 stream_component_open<\/b>:<\/p>\n
is->video_current_pts_time = av_gettime();<\/code><\/pre>\n
  \u0418 \u0442\u0435\u043f\u0435\u0440\u044c \u0432\u0441\u0435, \u0447\u0442\u043e \u043d\u0430\u043c \u043d\u0443\u0436\u043d\u043e, \u044d\u0442\u043e \u043a\u0430\u043a\u0438\u043c-\u0442\u043e \u0441\u043f\u043e\u0441\u043e\u0431\u043e\u043c \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e:<\/p>\n
double get_video_clock(VideoState *is) {   double delta;    delta = (av_gettime() - is->video_current_pts_time) \/ 1000000.0;   return is->video_current_pts + delta; }<\/code><\/pre>\n
  <\/p>\n
\u0410\u0431\u0441\u0442\u0440\u0430\u0433\u0438\u0440\u0443\u044f\u0441\u044c \u043e\u0442 \u0447\u0430\u0441\u043e\u0432<\/h3>\n
  \u041d\u043e \u0437\u0430\u0447\u0435\u043c \u0437\u0430\u0441\u0442\u0430\u0432\u043b\u044f\u0442\u044c \u0441\u0435\u0431\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0432\u0438\u0434\u0435\u043e\u0447\u0430\u0441\u044b? \u041c\u043e\u0436\u043d\u043e \u043f\u043e\u0439\u0442\u0438 \u0434\u0430\u043b\u044c\u0448\u0435 \u0438 \u0438\u0437\u043c\u0435\u043d\u0438\u0442\u044c \u043d\u0430\u0448 \u043a\u043e\u0434 \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0432\u0438\u0434\u0435\u043e, \u0447\u0442\u043e\u0431\u044b \u0430\u0443\u0434\u0438\u043e \u0438 \u0432\u0438\u0434\u0435\u043e \u043d\u0435 \u043f\u044b\u0442\u0430\u043b\u0438\u0441\u044c \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0434\u0440\u0443\u0433 \u0434\u0440\u0443\u0433\u0430. \u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u044c\u0442\u0435 \u0441\u0435\u0431\u0435 \u043a\u0430\u043a\u043e\u0439 \u0431\u0443\u0434\u0435\u0442 \u0431\u0430\u0440\u0434\u0430\u043a, \u0435\u0441\u043b\u0438 \u043c\u044b \u043f\u043e\u043f\u044b\u0442\u0430\u0435\u043c\u0441\u044f \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u044d\u0442\u043e \u043e\u043f\u0446\u0438\u0435\u0439 \u043a\u043e\u043c\u0430\u043d\u0434\u043d\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0438, \u043a\u0430\u043a \u0432 FFplay. \u0418\u0442\u0430\u043a, \u0434\u0430\u0432\u0430\u0439\u0442\u0435 \u0430\u0431\u0441\u0442\u0440\u0430\u0433\u0438\u0440\u0443\u0435\u043c\u0441\u044f: \u043c\u044b \u0441\u043e\u0437\u0434\u0430\u0434\u0438\u043c \u043d\u043e\u0432\u0443\u044e \u0444\u0443\u043d\u043a\u0446\u0438\u044e-\u043e\u0431\u0435\u0440\u0442\u043a\u0443, get_master_clock<\/b>, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u044f\u0435\u0442 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0443\u044e av_sync_type<\/b>, \u0430 \u0437\u0430\u0442\u0435\u043c \u0432\u044b\u0437\u044b\u0432\u0430\u0435\u0442 get_audio_clock<\/b>, get_video_clock<\/b> \u0438\u043b\u0438 \u0432\u043e\u043e\u0431\u0449\u0435 \u043b\u044e\u0431\u044b\u0435 \u0434\u0440\u0443\u0433\u0438\u0435 \u0447\u0430\u0441\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043c\u043e\u0433\u043b\u0438 \u0431\u044b \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c. \u041c\u044b \u043c\u043e\u0436\u0435\u043c \u0434\u0430\u0436\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0447\u0430\u0441\u044b \u043a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043d\u0430\u0437\u043e\u0432\u0435\u043c get_external_clock<\/b>:<\/p>\n
enum {   AV_SYNC_AUDIO_MASTER,   AV_SYNC_VIDEO_MASTER,   AV_SYNC_EXTERNAL_MASTER, };  #define DEFAULT_AV_SYNC_TYPE AV_SYNC_VIDEO_MASTER  double get_master_clock(VideoState *is) {   if(is->av_sync_type == AV_SYNC_VIDEO_MASTER) {     return get_video_clock(is);   } else if(is->av_sync_type == AV_SYNC_AUDIO_MASTER) {     return get_audio_clock(is);   } else {     return get_external_clock(is);   } } main() { ...   is->av_sync_type = DEFAULT_AV_SYNC_TYPE; ... }<\/code><\/pre>\n
  <\/p>\n
\u0421\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0430\u0446\u0438\u044f \u0430\u0443\u0434\u0438\u043e<\/h3>\n
  \u0422\u0435\u043f\u0435\u0440\u044c \u0441\u0430\u043c\u043e\u0435 \u0441\u043b\u043e\u0436\u043d\u043e\u0435: \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0430\u0443\u0434\u0438\u043e \u0441 \u0432\u0438\u0434\u0435\u043e\u0447\u0430\u0441\u0430\u043c\u0438. \u041d\u0430\u0448\u0430 \u0441\u0442\u0440\u0430\u0442\u0435\u0433\u0438\u044f \u0441\u043e\u0441\u0442\u043e\u0438\u0442 \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e\u0431\u044b \u0438\u0437\u043c\u0435\u0440\u0438\u0442\u044c, \u0433\u0434\u0435 \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u0430\u0443\u0434\u0438\u043e, \u0441\u0440\u0430\u0432\u043d\u0438\u0442\u044c \u0435\u0433\u043e \u0441 \u0432\u0438\u0434\u0435\u043e\u0447\u0430\u0441\u0430\u043c\u0438, \u0430 \u0437\u0430\u0442\u0435\u043c \u0432\u044b\u044f\u0441\u043d\u0438\u0442\u044c, \u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0441\u044d\u043c\u043f\u043b\u043e\u0432 \u043d\u0430\u043c \u043d\u0443\u0436\u043d\u043e \u043e\u0442\u0440\u0435\u0433\u0443\u043b\u0438\u0440\u043e\u0432\u0430\u0442\u044c, \u0442\u043e \u0435\u0441\u0442\u044c \u043d\u0443\u0436\u043d\u043e \u043b\u0438 \u043d\u0430\u043c \u0443\u0441\u043a\u043e\u0440\u044f\u0442\u044c\u0441\u044f \u043f\u0443\u0442\u0435\u043c \u043e\u0442\u0431\u0440\u0430\u0441\u044b\u0432\u0430\u043d\u0438\u044f \u0441\u044d\u043c\u043f\u043b\u043e\u0432 \u0438\u043b\u0438 \u0437\u0430\u043c\u0435\u0434\u043b\u0438\u0442\u044c\u0441\u044f, \u0434\u043e\u0431\u0430\u0432\u043b\u044f\u044f?<\/p>\n
  \u041c\u044b \u0437\u0430\u043f\u0443\u0441\u043a\u0430\u0435\u043c \u0444\u0443\u043d\u043a\u0446\u0438\u044e synchronize_audio<\/b> \u043a\u0430\u0436\u0434\u044b\u0439 \u0440\u0430\u0437, \u043a\u043e\u0433\u0434\u0430 \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0435\u043c \u043a\u0430\u0436\u0434\u044b\u0439 \u043d\u0430\u0431\u043e\u0440 \u0430\u0443\u0434\u0438\u043e\u0441\u044d\u043c\u043f\u043b\u043e\u0432, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043f\u043e\u043b\u0443\u0447\u0438\u043c, \u0447\u0442\u043e\u0431\u044b \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e \u0443\u043c\u0435\u043d\u044c\u0448\u0438\u0442\u044c \u0438\u043b\u0438 \u0443\u0432\u0435\u043b\u0438\u0447\u0438\u0442\u044c \u044d\u0442\u043e\u0442 \u043d\u0430\u0431\u043e\u0440. \u041e\u0434\u043d\u0430\u043a\u043e \u043c\u044b \u043d\u0435 \u0445\u043e\u0442\u0438\u043c \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0432\u0441\u0451 \u0432\u0440\u0435\u043c\u044f, \u0438\u0431\u043e \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0430 \u0430\u0443\u0434\u0438\u043e \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442 \u043d\u0430\u043c\u043d\u043e\u0433\u043e \u0447\u0430\u0449\u0435, \u0447\u0435\u043c \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0430 \u0432\u0438\u0434\u0435\u043e\u043f\u0430\u043a\u0435\u0442\u043e\u0432. \u0418\u0442\u0430\u043a, \u043c\u044b \u0441\u043e\u0431\u0438\u0440\u0430\u0435\u043c\u0441\u044f \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c \u043c\u0438\u043d\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0435 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0445 \u0432\u044b\u0437\u043e\u0432\u043e\u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 synchronize_audio<\/b>, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0441\u0447\u0438\u0442\u0430\u044e\u0442\u0441\u044f \u043d\u0435\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u044b\u043c\u0438, \u043f\u0440\u0435\u0436\u0434\u0435 \u0447\u0435\u043c \u0443\u0434\u043e\u0441\u0443\u0436\u0438\u043c\u0441\u044f \u0447\u0442\u043e-\u043b\u0438\u0431\u043e \u0441\u0434\u0435\u043b\u0430\u0442\u044c. \u041a\u043e\u043d\u0435\u0447\u043d\u043e, \u043a\u0430\u043a \u0438 \u0432 \u043f\u0440\u043e\u0448\u043b\u044b\u0439 \u0440\u0430\u0437, \u00ab\u043d\u0435\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0430\u0446\u0438\u044f\u00bb \u043e\u0437\u043d\u0430\u0447\u0430\u0435\u0442, \u0447\u0442\u043e \u0430\u0443\u0434\u0438\u043e\u0447\u0430\u0441\u044b \u0438 \u0432\u0438\u0434\u0435\u043e\u0447\u0430\u0441\u044b \u043e\u0442\u043b\u0438\u0447\u0430\u044e\u0442\u0441\u044f \u043d\u0430 \u0432\u0435\u043b\u0438\u0447\u0438\u043d\u0443, \u0431\u043e\u043b\u044c\u0448\u0443\u044e \u0447\u0435\u043c \u043f\u043e\u0440\u043e\u0433 \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0430\u0446\u0438\u0438.<\/p>\n
  \u0422\u0430\u043a \u0447\u0442\u043e \u043c\u044b \u0441\u043e\u0431\u0438\u0440\u0430\u0435\u043c\u0441\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u0440\u043e\u0431\u043d\u044b\u0439 \u043a\u043e\u044d\u0444\u0444\u0438\u0446\u0438\u0435\u043d\u0442, \u0441\u043a\u0430\u0436\u0435\u043c, \u0441<\/b>, \u0438 \u0442\u0435\u043f\u0435\u0440\u044c, \u0434\u043e\u043f\u0443\u0441\u0442\u0438\u043c, \u043c\u044b \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0438 N<\/b> \u043d\u0430\u0431\u043e\u0440\u043e\u0432 \u0430\u0443\u0434\u0438\u043e\u0441\u044d\u043c\u043f\u043b\u043e\u0432, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0431\u044b\u043b\u0438 \u043d\u0435 \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u044b. \u041a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0441\u044d\u043c\u043f\u043b\u043e\u0432, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u043c\u044b \u043d\u0435 \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0438\u0440\u0443\u0435\u043c, \u0442\u0430\u043a\u0436\u0435 \u043c\u043e\u0436\u0435\u0442 \u0441\u0438\u043b\u044c\u043d\u043e \u0432\u0430\u0440\u044c\u0438\u0440\u043e\u0432\u0430\u0442\u044c\u0441\u044f, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u043c\u044b \u0432\u043e\u0437\u044c\u043c\u0451\u043c \u0441\u0440\u0435\u0434\u043d\u0435\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0442\u043e\u0433\u043e, \u043d\u0430\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0441\u0438\u043b\u044c\u043d\u043e \u043d\u0435 \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d \u043a\u0430\u0436\u0434\u044b\u0439 \u0438\u0437 \u043d\u0438\u0445. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043f\u0435\u0440\u0432\u044b\u0439 \u0432\u044b\u0437\u043e\u0432 \u043c\u043e\u0433 \u043f\u043e\u043a\u0430\u0437\u0430\u0442\u044c, \u0447\u0442\u043e \u043c\u044b \u043d\u0435 \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u044b \u043d\u0430 40 \u043c\u0441, \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439 \u043d\u0430 50 \u043c\u0441 \u0438 \u0442\u0430\u043a \u0434\u0430\u043b\u0435\u0435. \u041d\u043e \u043c\u044b \u043d\u0435 \u0441\u043e\u0431\u0438\u0440\u0430\u0435\u043c\u0441\u044f \u0431\u0440\u0430\u0442\u044c \u043f\u0440\u043e\u0441\u0442\u043e\u0435 \u0441\u0440\u0435\u0434\u043d\u0435\u0435, \u043f\u043e\u0442\u043e\u043c\u0443 \u0447\u0442\u043e \u0441\u0430\u043c\u044b\u0435 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0438\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u0431\u043e\u043b\u0435\u0435 \u0432\u0430\u0436\u043d\u044b, \u0447\u0435\u043c \u0442\u0435, \u0447\u0442\u043e \u0438\u0434\u0443\u0442 \u043f\u0435\u0440\u0435\u0434 \u043d\u0438\u043c\u0438. \u0418\u0442\u0430\u043a, \u043c\u044b \u0441\u043e\u0431\u0438\u0440\u0430\u0435\u043c\u0441\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u0440\u043e\u0431\u043d\u044b\u0439 \u043a\u043e\u044d\u0444\u0444\u0438\u0446\u0438\u0435\u043d\u0442, \u0441\u043a\u0430\u0436\u0435\u043c, c<\/b>, \u0438 \u0441\u0443\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0440\u0430\u0437\u043b\u0438\u0447\u0438\u044f \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c: diff_sum<\/b> = new_diff<\/b> + diff_sum<\/b> * c<\/b>. \u041a\u043e\u0433\u0434\u0430 \u043c\u044b \u0433\u043e\u0442\u043e\u0432\u044b \u043d\u0430\u0439\u0442\u0438 \u0441\u0440\u0435\u0434\u043d\u044e\u044e \u0440\u0430\u0437\u043d\u0438\u0446\u0443, \u043c\u044b \u043f\u0440\u043e\u0441\u0442\u043e \u0432\u044b\u0447\u0438\u0441\u043b\u044f\u0435\u043c avg_diff<\/b> = diff_sum<\/b> * (1 \u2212 c<\/b>).<\/p>\n
  \u0427\u0442\u043e \u0437\u0434\u0435\u0441\u044c, \u0447\u0451\u0440\u0442 \u0432\u043e\u0437\u044c\u043c\u0438, \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442? \u0423\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u0435 \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u043a\u0430\u043a \u043a\u0430\u043a\u0430\u044f-\u0442\u043e \u043c\u0430\u0433\u0438\u044f. \u041d\u0443, \u044d\u0442\u043e \u0432 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u043c \u0432\u0437\u0432\u0435\u0448\u0435\u043d\u043d\u043e\u0435 \u0441\u0440\u0435\u0434\u043d\u0435\u0435 \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u0433\u0435\u043e\u043c\u0435\u0442\u0440\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0440\u044f\u0434\u0430 \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u0432\u0435\u0441\u043e\u0432. \u042f \u043d\u0435 \u0437\u043d\u0430\u044e, \u0435\u0441\u0442\u044c \u043b\u0438 \u043d\u0430\u0437\u0432\u0430\u043d\u0438\u0435 \u0434\u043b\u044f \u044d\u0442\u043e\u0433\u043e (\u044f \u0434\u0430\u0436\u0435 \u043f\u0440\u043e\u0432\u0435\u0440\u044f\u043b \u0432 \u0412\u0438\u043a\u0438\u043f\u0435\u0434\u0438\u0438!), \u041d\u043e \u0434\u043b\u044f \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u044f \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0439 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438, \u0432\u043e\u0442 \u043e\u0431\u044a\u044f\u0441\u043d\u0435\u043d\u0438\u0435<\/a> (\u0438\u043b\u0438 \u0432\u043e\u0442: weightedmean.txt<\/a>).<\/p>\n
  \u0412\u043e\u0442 \u043a\u0430\u043a \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u043d\u0430\u0448\u0430 \u0444\u0443\u043d\u043a\u0446\u0438\u044f:<\/p>\n
\/* Add or subtract samples to get a better sync, return new    audio buffer size *\/ int synchronize_audio(VideoState *is, short *samples, \t\t      int samples_size, double pts) {   int n;   double ref_clock;      n = 2 * is->audio_st->codec->channels;      if(is->av_sync_type != AV_SYNC_AUDIO_MASTER) {     double diff, avg_diff;     int wanted_size, min_size, max_size, nb_samples;          ref_clock = get_master_clock(is);     diff = get_audio_clock(is) - ref_clock;      if(diff < AV_NOSYNC_THRESHOLD) {       \/\/ accumulate the diffs       is->audio_diff_cum = diff + is->audio_diff_avg_coef \t* is->audio_diff_cum;       if(is->audio_diff_avg_count < AUDIO_DIFF_AVG_NB) { \tis->audio_diff_avg_count++;       } else { \tavg_diff = is->audio_diff_cum * (1.0 - is->audio_diff_avg_coef);         \/* Shrinking\/expanding buffer code.... *\/        }     } else {       \/* difference is TOO big; reset diff stuff *\/       is->audio_diff_avg_count = 0;       is->audio_diff_cum = 0;     }   }   return samples_size; }<\/code><\/pre>\n
  \u0422\u0430\u043a \u0447\u0442\u043e \u0443 \u043d\u0430\u0441 \u0432\u0441\u0435 \u0445\u043e\u0440\u043e\u0448\u043e; \u043c\u044b \u043f\u0440\u0438\u0431\u043b\u0438\u0437\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u0437\u043d\u0430\u0435\u043c, \u043d\u0430\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0437\u0432\u0443\u043a \u043d\u0435 \u0441\u043e\u0433\u043b\u0430\u0441\u043e\u0432\u0430\u043d \u0441 \u0432\u0438\u0434\u0435\u043e \u0438\u043b\u0438 \u0441 \u0442\u0435\u043c, \u0447\u0442\u043e \u043c\u044b \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u0447\u0430\u0441\u043e\u0432. \u0418\u0442\u0430\u043a, \u0434\u0430\u0432\u0430\u0439\u0442\u0435 \u0442\u0435\u043f\u0435\u0440\u044c \u043f\u043e\u0441\u0447\u0438\u0442\u0430\u0435\u043c, \u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0441\u044d\u043c\u043f\u043b\u043e\u0432 \u043d\u0430\u043c \u043d\u0443\u0436\u043d\u043e \u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u0438\u043b\u0438 \u043e\u0442\u0431\u0440\u043e\u0441\u0438\u0442\u044c, \u043f\u043e\u043c\u0435\u0441\u0442\u0438\u0432 \u044d\u0442\u043e\u0442 \u043a\u043e\u0434 \u0432 \u0440\u0430\u0437\u0434\u0435\u043b \u00ab\u0421\u043e\u043a\u0440\u0430\u0449\u0430\u044e\u0449\u0438\u0439\/\u0440\u0430\u0441\u0448\u0438\u0440\u044f\u044e\u0449\u0438\u0439 \u0431\u0443\u0444\u0435\u0440\u043d\u044b\u0439 \u043a\u043e\u0434\u00bb:<\/p>\n
if(fabs(avg_diff) >= is->audio_diff_threshold) {   wanted_size = samples_size +    ((int)(diff * is->audio_st->codec->sample_rate) * n);   min_size = samples_size * ((100 - SAMPLE_CORRECTION_PERCENT_MAX)                              \/ 100);   max_size = samples_size * ((100 + SAMPLE_CORRECTION_PERCENT_MAX)                               \/ 100);   if(wanted_size < min_size) {     wanted_size = min_size;   } else if (wanted_size > max_size) {     wanted_size = max_size;   }<\/code><\/pre>\n
  \u041f\u043e\u043c\u043d\u0438\u0442\u0435, \u0447\u0442\u043e audio_length<\/b> * (sample_rate<\/b> * # of channel<\/b> * 2) \u2014 \u044d\u0442\u043e \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0441\u044d\u043c\u043f\u043b\u043e\u0432 \u0432 audio_length<\/b> \u0441\u0435\u043a\u0443\u043d\u0434\u0430\u0445 \u0430\u0443\u0434\u0438\u043e. \u0421\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e, \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0441\u044d\u043c\u043f\u043b\u043e\u0432, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u043c\u044b \u0445\u043e\u0442\u0438\u043c, \u0431\u0443\u0434\u0435\u0442 \u0440\u0430\u0432\u043d\u044b\u043c \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u0443 \u0441\u044d\u043c\u043f\u043b\u043e\u0432, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0443 \u043d\u0430\u0441 \u0443\u0436\u0435 \u0435\u0441\u0442\u044c, \u043f\u043b\u044e\u0441 \u0438\u043b\u0438 \u043c\u0438\u043d\u0443\u0441 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0441\u044d\u043c\u043f\u043b\u043e\u0432, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u044e\u0442 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u0443 \u0432\u0440\u0435\u043c\u0435\u043d\u0438, \u0432 \u0442\u0435\u0447\u0435\u043d\u0438\u0435 \u043a\u043e\u0442\u043e\u0440\u043e\u0433\u043e \u0432\u043e\u0441\u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u043b\u0441\u044f \u0437\u0432\u0443\u043a. \u041c\u044b \u0442\u0430\u043a\u0436\u0435 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u043c \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u043e\u0433\u043e, \u043d\u0430\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0431\u043e\u043b\u044c\u0448\u043e\u0439 \u0438\u043b\u0438 \u043c\u0430\u043b\u0435\u043d\u044c\u043a\u043e\u0439 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u043d\u0430\u0448\u0430 \u043a\u043e\u0440\u0440\u0435\u043a\u0446\u0438\u044f, \u043f\u043e\u0442\u043e\u043c\u0443 \u0447\u0442\u043e \u0435\u0441\u043b\u0438 \u043c\u044b \u0441\u043b\u0438\u0448\u043a\u043e\u043c \u0441\u0438\u043b\u044c\u043d\u043e \u0438\u0437\u043c\u0435\u043d\u0438\u043c \u043d\u0430\u0448 \u0431\u0443\u0444\u0435\u0440, \u044d\u0442\u043e \u0431\u0443\u0434\u0435\u0442 \u0441\u043b\u0438\u0448\u043a\u043e\u043c \u0440\u0430\u0437\u0434\u0440\u0430\u0436\u0430\u044e\u0449\u0438\u043c \u0434\u043b\u044f \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f.<\/p>\n
\u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u0430 \u0441\u044d\u043c\u043f\u043b\u043e\u0432<\/h3>\n
  \u0422\u0435\u043f\u0435\u0440\u044c \u043d\u0430\u043c \u043d\u0443\u0436\u043d\u043e \u0438\u0441\u043f\u0440\u0430\u0432\u0438\u0442\u044c \u0437\u0432\u0443\u043a. \u0412\u043e\u0437\u043c\u043e\u0436\u043d\u043e, \u0432\u044b \u0437\u0430\u043c\u0435\u0442\u0438\u043b\u0438, \u0447\u0442\u043e \u043d\u0430\u0448\u0430 \u0444\u0443\u043d\u043a\u0446\u0438\u044f synchronize_audio<\/b> \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442 \u0440\u0430\u0437\u043c\u0435\u0440 \u0441\u044d\u043c\u043f\u043b\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0437\u0430\u0442\u0435\u043c \u0441\u043e\u043e\u0431\u0449\u0438\u0442 \u043d\u0430\u043c, \u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0431\u0430\u0439\u0442\u043e\u0432 \u043d\u0443\u0436\u043d\u043e \u043e\u0442\u043f\u0440\u0430\u0432\u0438\u0442\u044c \u043f\u043e\u0442\u043e\u043a\u0443. \u0422\u0430\u043a \u0447\u0442\u043e \u043d\u0430\u043c \u043f\u0440\u043e\u0441\u0442\u043e \u043d\u0443\u0436\u043d\u043e \u043d\u0430\u0441\u0442\u0440\u043e\u0438\u0442\u044c \u0440\u0430\u0437\u043c\u0435\u0440 \u0441\u044d\u043c\u043f\u043b\u0430 \u043d\u0430 \u0442\u0440\u0435\u0431\u0443\u0435\u043c\u043e\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435. \u042d\u0442\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u0434\u043b\u044f \u0443\u043c\u0435\u043d\u044c\u0448\u0435\u043d\u0438\u044f \u0440\u0430\u0437\u043c\u0435\u0440\u0430 \u0441\u044d\u043c\u043f\u043b\u0430. \u041d\u043e \u0435\u0441\u043b\u0438 \u043d\u0430\u0434\u043e \u0443\u0432\u0435\u043b\u0438\u0447\u0438\u0442\u044c \u0435\u0433\u043e, \u043c\u044b \u043d\u0435 \u043c\u043e\u0436\u0435\u043c \u043f\u0440\u043e\u0441\u0442\u043e \u0443\u0432\u0435\u043b\u0438\u0447\u0438\u0442\u044c \u0440\u0430\u0437\u043c\u0435\u0440 \u0441\u044d\u043c\u043f\u043b\u0430, \u043f\u043e\u0442\u043e\u043c\u0443 \u0447\u0442\u043e \u0432 \u0431\u0443\u0444\u0435\u0440\u0435 \u0431\u043e\u043b\u044c\u0448\u0435 \u043d\u0435\u0442 \u0434\u0430\u043d\u043d\u044b\u0445! \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u043c\u044b \u0434\u043e\u043b\u0436\u043d\u044b \u043d\u0435\u043c\u043d\u043e\u0433\u043e \u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c. \u041d\u043e \u0447\u0442\u043e \u0438\u043c\u0435\u043d\u043d\u043e \u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c? \u0411\u044b\u043b\u043e \u0431\u044b \u0433\u043b\u0443\u043f\u043e \u043f\u044b\u0442\u0430\u0442\u044c\u0441\u044f \u044d\u043a\u0441\u0442\u0440\u0430\u043f\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0430\u0443\u0434\u0438\u043e, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u0434\u0430\u0432\u0430\u0439\u0442\u0435 \u043f\u0440\u043e\u0441\u0442\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c \u0430\u0443\u0434\u0438\u043e, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u0443 \u043d\u0430\u0441 \u0443\u0436\u0435 \u0435\u0441\u0442\u044c, \u0434\u043e\u0431\u0430\u0432\u0438\u0432 \u0432 \u0431\u0443\u0444\u0435\u0440 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0433\u043e \u0441\u044d\u043c\u043f\u043b\u0430.<\/p>\n
if(wanted_size < samples_size) {   \/* remove samples *\/   samples_size = wanted_size; } else if(wanted_size > samples_size) {   uint8_t *samples_end, *q;   int nb;    \/* add samples by copying final samples *\/   nb = (samples_size - wanted_size);   samples_end = (uint8_t *)samples + samples_size - n;   q = samples_end + n;   while(nb > 0) {     memcpy(q, samples_end, n);     q += n;     nb -= n;   }   samples_size = wanted_size; }<\/code><\/pre>\n
  \u0422\u0435\u043f\u0435\u0440\u044c \u043c\u044b \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u043c \u0440\u0430\u0437\u043c\u0435\u0440 \u0441\u044d\u043c\u043f\u043b\u0430, \u0438 \u043c\u044b \u0437\u0430\u043a\u043e\u043d\u0447\u0438\u043b\u0438 \u0441 \u044d\u0442\u043e\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u0435\u0439. \u0412\u0441\u0451, \u0447\u0442\u043e \u043d\u0430\u043c \u043d\u0443\u0436\u043d\u043e \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u0441\u0435\u0439\u0447\u0430\u0441, \u044d\u0442\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0432\u043e\u0442 \u044d\u0442\u043e:<\/p>\n
void audio_callback(void *userdata, Uint8 *stream, int len) {    VideoState *is = (VideoState *)userdata;   int len1, audio_size;   double pts;    while(len > 0) {     if(is->audio_buf_index >= is->audio_buf_size) {       \/* We have already sent all our data; get more *\/       audio_size = audio_decode_frame(is, is->audio_buf, sizeof(is->audio_buf), &pts);       if(audio_size < 0) { \t\/* If error, output silence *\/ \tis->audio_buf_size = 1024; \tmemset(is->audio_buf, 0, is->audio_buf_size);       } else { \taudio_size = synchronize_audio(is, (int16_t *)is->audio_buf, \t\t\t\t       audio_size, pts); \tis->audio_buf_size = audio_size;<\/code><\/pre>\n
  \u0412\u0441\u0435, \u0447\u0442\u043e \u043c\u044b \u0441\u0434\u0435\u043b\u0430\u043b\u0438, \u044d\u0442\u043e \u0432\u0441\u0442\u0430\u0432\u0438\u043b\u0438 \u0432\u044b\u0437\u043e\u0432 synchronize_audio<\/b>. (\u0422\u0430\u043a\u0436\u0435 \u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u043e \u043f\u0440\u043e\u0432\u0435\u0440\u044c\u0442\u0435 \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u0439 \u043a\u043e\u0434, \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u043c\u044b \u0438\u043d\u0438\u0446\u0438\u0430\u043b\u0438\u0437\u0438\u0440\u0443\u0435\u043c \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0435, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u044f \u043d\u0435 \u0443\u0434\u043e\u0441\u0443\u0436\u0438\u043b\u0441\u044f \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c.)<\/p>\n
  \u0418 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0435, \u043f\u0440\u0435\u0436\u0434\u0435 \u0447\u0435\u043c \u0437\u0430\u043a\u043e\u043d\u0447\u0438\u043c: \u043d\u0430\u043c \u043d\u0443\u0436\u043d\u043e \u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u0443\u0441\u043b\u043e\u0432\u0438\u0435 \u00ab\u0435\u0441\u043b\u0438\u00bb, \u0447\u0442\u043e\u0431\u044b \u0443\u0431\u0435\u0434\u0438\u0442\u044c\u0441\u044f, \u0447\u0442\u043e \u043c\u044b \u043d\u0435 \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0438\u0440\u0443\u0435\u043c \u0432\u0438\u0434\u0435\u043e, \u0435\u0441\u043b\u0438 \u044d\u0442\u043e \u0433\u043b\u0430\u0432\u043d\u044b\u0435 \u0447\u0430\u0441\u044b:<\/p>\n
if(is->av_sync_type != AV_SYNC_VIDEO_MASTER) {   ref_clock = get_master_clock(is);   diff = vp->pts - ref_clock;    \/* Skip or repeat the frame. Take delay into account      FFPlay still doesn't "know if this is the best guess." *\/   sync_threshold = (delay > AV_SYNC_THRESHOLD) ? delay :                     AV_SYNC_THRESHOLD;   if(fabs(diff) < AV_NOSYNC_THRESHOLD) {     if(diff <= -sync_threshold) {       delay = 0;     } else if(diff >= sync_threshold) {       delay = 2 * delay;     }   } }<\/code><\/pre>\n
  \u0418 \u044d\u0442\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442! \u0423\u0431\u0435\u0434\u0438\u0442\u0435\u0441\u044c, \u0447\u0442\u043e \u0432\u044b \u043f\u0440\u043e\u0432\u0435\u0440\u0438\u043b\u0438 \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u0439 \u0444\u0430\u0439\u043b, \u0447\u0442\u043e\u0431\u044b \u0438\u043d\u0438\u0446\u0438\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043b\u044e\u0431\u044b\u0435 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0435, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u044f \u043d\u0435 \u0443\u0434\u043e\u0441\u0443\u0436\u0438\u043b\u0441\u044f \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u0438\u043b\u0438 \u0438\u043d\u0438\u0446\u0438\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u0442\u044c. \u0417\u0430\u0442\u0435\u043c \u0441\u043a\u043e\u043c\u043f\u0438\u043b\u0438\u0440\u0443\u0439\u0442\u0435:<\/p>\n
gcc -o tutorial06 tutorial06.c -lavutil -lavformat -lavcodec -lswscale -lz -lm \\ `sdl-config --cflags --libs`<\/code><\/pre>\n
  \u0438 \u043f\u043e\u043b\u0451\u0442 \u0431\u0443\u0434\u0435\u0442 \u043d\u043e\u0440\u043c\u0430\u043b\u044c\u043d\u044b\u0439.<\/p>\n
  \u0412 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u043c \u0443\u0440\u043e\u043a\u0435 \u0441\u0434\u0435\u043b\u0430\u0435\u043c \u043f\u0435\u0440\u0435\u043c\u043e\u0442\u043a\u0443.<\/a><\/p>\n
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\u0423\u0440\u043e\u043a 7: \u041f\u043e\u0438\u0441\u043a \u2190<\/a> \u21d1<\/a> \u2192<\/a><\/h2>\n
  <\/p>\n
                         \u041f\u043e\u043b\u043d\u044b\u0439 \u043b\u0438\u0441\u0442\u0438\u043d\u0433 tutorial07.c<\/b>                         <\/p>\n
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\/\/ tutorial05.c \/\/ A pedagogical video player that really works! \/\/ \/\/ Code based on FFplay, Copyright (c) 2003 Fabrice Bellard,  \/\/ and a tutorial by Martin Bohme (boehme@inb.uni-luebeckREMOVETHIS.de) \/\/ Tested on Gentoo, CVS version 5\/01\/07 compiled with GCC 4.1.1 \/\/ With updates from https:\/\/github.com\/chelyaev\/ffmpeg-tutorial \/\/ Updates tested on: \/\/ LAVC 54.59.100, LAVF 54.29.104, LSWS 2.1.101, SDL 1.2.15 \/\/ on GCC 4.7.2 in Debian February 2015 \/\/ Use \/\/ \/\/ gcc -o tutorial05 tutorial05.c -lavformat -lavcodec -lswscale -lz -lm `sdl-config --cflags --libs` \/\/ to build (assuming libavformat and libavcodec are correctly installed,  \/\/ and assuming you have sdl-config. Please refer to SDL docs for your installation.) \/\/ \/\/ Run using \/\/ tutorial04 myvideofile.mpg \/\/ \/\/ to play the video stream on your screen.  #include <libavcodec\/avcodec.h> #include <libavformat\/avformat.h> #include <libswscale\/swscale.h>  #include <SDL.h> #include <SDL_thread.h>  #ifdef __MINGW32__ #undef main \/* Prevents SDL from overriding main() *\/ #endif  #include <stdio.h> #include <assert.h> #include <math.h>  \/\/ compatibility with newer API #if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(55,28,1) #define av_frame_alloc avcodec_alloc_frame #define av_frame_free avcodec_free_frame #endif  #define SDL_AUDIO_BUFFER_SIZE 1024 #define MAX_AUDIO_FRAME_SIZE 192000  #define MAX_AUDIOQ_SIZE (5 * 16 * 1024) #define MAX_VIDEOQ_SIZE (5 * 256 * 1024)  #define AV_SYNC_THRESHOLD 0.01 #define AV_NOSYNC_THRESHOLD 10.0  #define SAMPLE_CORRECTION_PERCENT_MAX 10 #define AUDIO_DIFF_AVG_NB 20  #define FF_REFRESH_EVENT (SDL_USEREVENT) #define FF_QUIT_EVENT (SDL_USEREVENT + 1)  #define VIDEO_PICTURE_QUEUE_SIZE 1  #define DEFAULT_AV_SYNC_TYPE AV_SYNC_VIDEO_MASTER  typedef struct PacketQueue {   AVPacketList *first_pkt, *last_pkt;   int nb_packets;   int size;   SDL_mutex *mutex;   SDL_cond *cond; } PacketQueue;   typedef struct VideoPicture {   SDL_Overlay *bmp;   int width, height; \/* source height & width *\/   int allocated;   double pts; } VideoPicture;  typedef struct VideoState {    AVFormatContext *pFormatCtx;   int             videoStream, audioStream;    int             av_sync_type;   double          external_clock; \/* external clock base *\/   int64_t         external_clock_time;   int             seek_req;   int             seek_flags;   int64_t         seek_pos;    double          audio_clock;   AVStream        *audio_st;   AVCodecContext  *audio_ctx;   PacketQueue     audioq;   uint8_t         audio_buf[(AVCODEC_MAX_AUDIO_FRAME_SIZE * 3) \/ 2];   unsigned int    audio_buf_size;   unsigned int    audio_buf_index;   AVFrame         audio_frame;   AVPacket        audio_pkt;   uint8_t         *audio_pkt_data;   int             audio_pkt_size;   int             audio_hw_buf_size;   double          audio_diff_cum; \/* used for AV difference average computation *\/   double          audio_diff_avg_coef;   double          audio_diff_threshold;   int             audio_diff_avg_count;   double          frame_timer;   double          frame_last_pts;   double          frame_last_delay;   double          video_clock; \/\/\/<pts of last decoded frame \/ predicted pts of next decoded frame   double          video_current_pts; \/\/\/<current displayed pts (different from video_clock if frame fifos are used)   int64_t         video_current_pts_time;  \/\/\/<time (av_gettime) at which we updated video_current_pts - used to have running video pts   AVStream        *video_st;   AVCodecContext  *video_ctx;   PacketQueue     videoq;   struct SwsContext *sws_ctx;    VideoPicture    pictq[VIDEO_PICTURE_QUEUE_SIZE];   int             pictq_size, pictq_rindex, pictq_windex;   SDL_mutex       *pictq_mutex;   SDL_cond        *pictq_cond;      SDL_Thread      *parse_tid;   SDL_Thread      *video_tid;    char            filename[1024];   int             quit; } VideoState;  enum {   AV_SYNC_AUDIO_MASTER,   AV_SYNC_VIDEO_MASTER,   AV_SYNC_EXTERNAL_MASTER, };  SDL_Surface     *screen; SDL_mutex       *screen_mutex;  \/* Since we only have one decoding thread, the Big Struct    can be global in case we need it. *\/ VideoState *global_video_state; AVPacket flush_pkt;  void packet_queue_init(PacketQueue *q) {   memset(q, 0, sizeof(PacketQueue));   q->mutex = SDL_CreateMutex();   q->cond = SDL_CreateCond(); }  int packet_queue_put(PacketQueue *q, AVPacket *pkt) {    AVPacketList *pkt1;   if(pkt != &flush_pkt && av_dup_packet(pkt) < 0) {     return -1;   }   pkt1 = av_malloc(sizeof(AVPacketList));   if (!pkt1)     return -1;   pkt1->pkt = *pkt;   pkt1->next = NULL;      SDL_LockMutex(q->mutex);    if (!q->last_pkt)     q->first_pkt = pkt1;   else     q->last_pkt->next = pkt1;   q->last_pkt = pkt1;   q->nb_packets++;   q->size += pkt1->pkt.size;   SDL_CondSignal(q->cond);      SDL_UnlockMutex(q->mutex);   return 0; } static int packet_queue_get(PacketQueue *q, AVPacket *pkt, int block) {   AVPacketList *pkt1;   int ret;    SDL_LockMutex(q->mutex);      for(;;) {          if(global_video_state->quit) {       ret = -1;       break;     }      pkt1 = q->first_pkt;     if (pkt1) {       q->first_pkt = pkt1->next;       if (!q->first_pkt) \tq->last_pkt = NULL;       q->nb_packets--;       q->size -= pkt1->pkt.size;       *pkt = pkt1->pkt;       av_free(pkt1);       ret = 1;       break;     } else if (!block) {       ret = 0;       break;     } else {       SDL_CondWait(q->cond, q->mutex);     }   }   SDL_UnlockMutex(q->mutex);   return ret; }  static void packet_queue_flush(PacketQueue *q) {   AVPacketList *pkt, *pkt1;    SDL_LockMutex(q->mutex);   for(pkt = q->first_pkt; pkt != NULL; pkt = pkt1) {     pkt1 = pkt->next;     av_free_packet(&pkt->pkt);     av_freep(&pkt);   }   q->last_pkt = NULL;   q->first_pkt = NULL;   q->nb_packets = 0;   q->size = 0;   SDL_UnlockMutex(q->mutex); }  double get_audio_clock(VideoState *is) {   double pts;   int hw_buf_size, bytes_per_sec, n;      pts = is->audio_clock; \/* maintained in the audio thread *\/   hw_buf_size = is->audio_buf_size - is->audio_buf_index;   bytes_per_sec = 0;   n = is->audio_ctx->channels * 2;   if(is->audio_st) {     bytes_per_sec = is->audio_ctx->sample_rate * n;   }   if(bytes_per_sec) {     pts -= (double)hw_buf_size \/ bytes_per_sec;   }   return pts; } double get_video_clock(VideoState *is) {   double delta;    delta = (av_gettime() - is->video_current_pts_time) \/ 1000000.0;   return is->video_current_pts + delta; } double get_external_clock(VideoState *is) {   return av_gettime() \/ 1000000.0; }  double get_master_clock(VideoState *is) {   if(is->av_sync_type == AV_SYNC_VIDEO_MASTER) {     return get_video_clock(is);   } else if(is->av_sync_type == AV_SYNC_AUDIO_MASTER) {     return get_audio_clock(is);   } else {     return get_external_clock(is);   } }   \/* Add or subtract samples to get a better sync, return new    audio buffer size *\/ int synchronize_audio(VideoState *is, short *samples, \t\t      int samples_size, double pts) {   int n;   double ref_clock;    n = 2 * is->audio_ctx->channels;      if(is->av_sync_type != AV_SYNC_AUDIO_MASTER) {     double diff, avg_diff;     int wanted_size, min_size, max_size \/*, nb_samples *\/;          ref_clock = get_master_clock(is);     diff = get_audio_clock(is) - ref_clock;      if(diff < AV_NOSYNC_THRESHOLD) {       \/\/ accumulate the diffs       is->audio_diff_cum = diff + is->audio_diff_avg_coef \t* is->audio_diff_cum;       if(is->audio_diff_avg_count < AUDIO_DIFF_AVG_NB) { \tis->audio_diff_avg_count++;       } else { \tavg_diff = is->audio_diff_cum * (1.0 - is->audio_diff_avg_coef); \tif(fabs(avg_diff) >= is->audio_diff_threshold) { \t  wanted_size = samples_size + ((int)(diff * is->audio_ctx->sample_rate) * n); \t  min_size = samples_size * ((100 - SAMPLE_CORRECTION_PERCENT_MAX) \/ 100); \t  max_size = samples_size * ((100 + SAMPLE_CORRECTION_PERCENT_MAX) \/ 100); \t  if(wanted_size < min_size) { \t    wanted_size = min_size; \t  } else if (wanted_size > max_size) { \t    wanted_size = max_size; \t  } \t  if(wanted_size < samples_size) { \t    \/* remove samples *\/ \t    samples_size = wanted_size; \t  } else if(wanted_size > samples_size) { \t    uint8_t *samples_end, *q; \t    int nb;  \t    \/* add samples by copying final sample*\/ \t    nb = (samples_size - wanted_size); \t    samples_end = (uint8_t *)samples + samples_size - n; \t    q = samples_end + n; \t    while(nb > 0) { \t      memcpy(q, samples_end, n); \t      q += n; \t      nb -= n; \t    } \t    samples_size = wanted_size; \t  } \t}       }     } else {       \/* difference is TOO big; reset diff stuff *\/       is->audio_diff_avg_count = 0;       is->audio_diff_cum = 0;     }   }   return samples_size; }  int audio_decode_frame(VideoState *is, uint8_t *audio_buf, int buf_size, double *pts_ptr) {    int len1, data_size = 0;   AVPacket *pkt = &is->audio_pkt;   double pts;   int n;    for(;;) {     while(is->audio_pkt_size > 0) {       int got_frame = 0;       len1 = avcodec_decode_audio4(is->audio_ctx, &is->audio_frame, &got_frame, pkt);       if(len1 < 0) { \t\/* if error, skip frame *\/ \tis->audio_pkt_size = 0; \tbreak;       }       data_size = 0;       if(got_frame) { \tdata_size = av_samples_get_buffer_size(NULL,  \t\t\t\t\t       is->audio_ctx->channels, \t\t\t\t\t       is->audio_frame.nb_samples, \t\t\t\t\t       is->audio_ctx->sample_fmt, \t\t\t\t\t       1); \tassert(data_size <= buf_size); \tmemcpy(audio_buf, is->audio_frame.data[0], data_size);       }       is->audio_pkt_data += len1;       is->audio_pkt_size -= len1;       if(data_size <= 0) { \t\/* No data yet, get more frames *\/ \tcontinue;       }       pts = is->audio_clock;       *pts_ptr = pts;       n = 2 * is->audio_ctx->channels;       is->audio_clock += (double)data_size \/ \t(double)(n * is->audio_ctx->sample_rate);       \/* We have data, return it and come back for more later *\/       return data_size;     }     if(pkt->data)       av_free_packet(pkt);      if(is->quit) {       return -1;     }     \/* next packet *\/     if(packet_queue_get(&is->audioq, pkt, 1) < 0) {       return -1;     }     if(pkt->data == flush_pkt.data) {       avcodec_flush_buffers(is->audio_ctx);       continue;     }     is->audio_pkt_data = pkt->data;     is->audio_pkt_size = pkt->size;     \/* if update, update the audio clock w\/pts *\/     if(pkt->pts != AV_NOPTS_VALUE) {       is->audio_clock = av_q2d(is->audio_st->time_base)*pkt->pts;     }   } }  void audio_callback(void *userdata, Uint8 *stream, int len) {    VideoState *is = (VideoState *)userdata;   int len1, audio_size;   double pts;    while(len > 0) {     if(is->audio_buf_index >= is->audio_buf_size) {       \/* We have already sent all our data; get more *\/       audio_size = audio_decode_frame(is, is->audio_buf, sizeof(is->audio_buf), &pts);       if(audio_size < 0) { \t\/* If error, output silence *\/ \tis->audio_buf_size = 1024; \tmemset(is->audio_buf, 0, is->audio_buf_size);       } else { \taudio_size = synchronize_audio(is, (int16_t *)is->audio_buf, \t\t\t\t       audio_size, pts); \tis->audio_buf_size = audio_size;       }       is->audio_buf_index = 0;     }     len1 = is->audio_buf_size - is->audio_buf_index;     if(len1 > len)       len1 = len;     memcpy(stream, (uint8_t *)is->audio_buf + is->audio_buf_index, len1);     len -= len1;     stream += len1;     is->audio_buf_index += len1;   } }  static Uint32 sdl_refresh_timer_cb(Uint32 interval, void *opaque) {   SDL_Event event;   event.type = FF_REFRESH_EVENT;   event.user.data1 = opaque;   SDL_PushEvent(&event);   return 0; \/* 0 means stop timer *\/ }  \/* schedule a video refresh in 'delay' ms *\/ static void schedule_refresh(VideoState *is, int delay) {   SDL_AddTimer(delay, sdl_refresh_timer_cb, is); }  void video_display(VideoState *is) {    SDL_Rect rect;   VideoPicture *vp;   float aspect_ratio;   int w, h, x, y;   int i;    vp = &is->pictq[is->pictq_rindex];   if(vp->bmp) {     if(is->video_ctx->sample_aspect_ratio.num == 0) {       aspect_ratio = 0;     } else {       aspect_ratio = av_q2d(is->video_ctx->sample_aspect_ratio) * \tis->video_ctx->width \/ is->video_ctx->height;     }     if(aspect_ratio <= 0.0) {       aspect_ratio = (float)is->video_ctx->width \/ \t(float)is->video_ctx->height;     }     h = screen->h;     w = ((int)rint(h * aspect_ratio)) & -3;     if(w > screen->w) {       w = screen->w;       h = ((int)rint(w \/ aspect_ratio)) & -3;     }     x = (screen->w - w) \/ 2;     y = (screen->h - h) \/ 2;          rect.x = x;     rect.y = y;     rect.w = w;     rect.h = h;     SDL_LockMutex(screen_mutex);     SDL_DisplayYUVOverlay(vp->bmp, &rect);     SDL_UnlockMutex(screen_mutex);   } }  void video_refresh_timer(void *userdata) {    VideoState *is = (VideoState *)userdata;   VideoPicture *vp;   double actual_delay, delay, sync_threshold, ref_clock, diff;      if(is->video_st) {     if(is->pictq_size == 0) {       schedule_refresh(is, 1);     } else {       vp = &is->pictq[is->pictq_rindex];              is->video_current_pts = vp->pts;       is->video_current_pts_time = av_gettime();       delay = vp->pts - is->frame_last_pts; \/* the pts from last time *\/       if(delay <= 0 || delay >= 1.0) { \t\/* if incorrect delay, use previous one *\/ \tdelay = is->frame_last_delay;       }       \/* save for next time *\/       is->frame_last_delay = delay;       is->frame_last_pts = vp->pts;          \/* update delay to sync to audio if not master source *\/       if(is->av_sync_type != AV_SYNC_VIDEO_MASTER) { \tref_clock = get_master_clock(is); \tdiff = vp->pts - ref_clock; \t \t\/* Skip or repeat the frame. Take delay into account \t   FFPlay still doesn't "know if this is the best guess." *\/ \tsync_threshold = (delay > AV_SYNC_THRESHOLD) ? delay : AV_SYNC_THRESHOLD; \tif(fabs(diff) < AV_NOSYNC_THRESHOLD) { \t  if(diff <= -sync_threshold) { \t    delay = 0; \t  } else if(diff >= sync_threshold) { \t    delay = 2 * delay; \t  } \t}       }       is->frame_timer += delay;       \/* computer the REAL delay *\/       actual_delay = is->frame_timer - (av_gettime() \/ 1000000.0);       if(actual_delay < 0.010) { \t\/* Really it should skip the picture instead *\/ \tactual_delay = 0.010;       }       schedule_refresh(is, (int)(actual_delay * 1000 + 0.5));              \/* show the picture! *\/       video_display(is);              \/* update queue for next picture! *\/       if(++is->pictq_rindex == VIDEO_PICTURE_QUEUE_SIZE) { \tis->pictq_rindex = 0;       }       SDL_LockMutex(is->pictq_mutex);       is->pictq_size--;       SDL_CondSignal(is->pictq_cond);       SDL_UnlockMutex(is->pictq_mutex);     }   } else {     schedule_refresh(is, 100);   } }        void alloc_picture(void *userdata) {    VideoState *is = (VideoState *)userdata;   VideoPicture *vp;    vp = &is->pictq[is->pictq_windex];   if(vp->bmp) {     \/\/ we already have one make another, bigger\/smaller     SDL_FreeYUVOverlay(vp->bmp);   }   \/\/ Allocate a place to put our YUV image on that screen   SDL_LockMutex(screen_mutex);   vp->bmp = SDL_CreateYUVOverlay(is->video_ctx->width, \t\t\t\t is->video_ctx->height, \t\t\t\t SDL_YV12_OVERLAY, \t\t\t\t screen);   SDL_UnlockMutex(screen_mutex);    vp->width = is->video_ctx->width;   vp->height = is->video_ctx->height;   vp->allocated = 1;  }  int queue_picture(VideoState *is, AVFrame *pFrame, double pts) {    VideoPicture *vp;   int dst_pix_fmt;   AVPicture pict;    \/* wait until we have space for a new pic *\/   SDL_LockMutex(is->pictq_mutex);   while(is->pictq_size >= VIDEO_PICTURE_QUEUE_SIZE && \t!is->quit) {     SDL_CondWait(is->pictq_cond, is->pictq_mutex);   }   SDL_UnlockMutex(is->pictq_mutex);    if(is->quit)     return -1;    \/\/ windex is set to 0 initially   vp = &is->pictq[is->pictq_windex];    \/* allocate or resize the buffer! *\/   if(!vp->bmp ||      vp->width != is->video_ctx->width ||      vp->height != is->video_ctx->height) {     SDL_Event event;      vp->allocated = 0;     alloc_picture(is);     if(is->quit) {       return -1;     }   }   \/* We have a place to put our picture on the queue *\/    if(vp->bmp) {      SDL_LockYUVOverlay(vp->bmp);     vp->pts = pts;          dst_pix_fmt = PIX_FMT_YUV420P;     \/* point pict at the queue *\/      pict.data[0] = vp->bmp->pixels[0];     pict.data[1] = vp->bmp->pixels[2];     pict.data[2] = vp->bmp->pixels[1];          pict.linesize[0] = vp->bmp->pitches[0];     pict.linesize[1] = vp->bmp->pitches[2];     pict.linesize[2] = vp->bmp->pitches[1];          \/\/ Convert the image into YUV format that SDL uses     sws_scale(is->sws_ctx, (uint8_t const * const *)pFrame->data, \t      pFrame->linesize, 0, is->video_ctx->height, \t      pict.data, pict.linesize);          SDL_UnlockYUVOverlay(vp->bmp);     \/* now we inform our display thread that we have a pic ready *\/     if(++is->pictq_windex == VIDEO_PICTURE_QUEUE_SIZE) {       is->pictq_windex = 0;     }     SDL_LockMutex(is->pictq_mutex);     is->pictq_size++;     SDL_UnlockMutex(is->pictq_mutex);   }   return 0; }  double synchronize_video(VideoState *is, AVFrame *src_frame, double pts) {    double frame_delay;    if(pts != 0) {     \/* if we have pts, set video clock to it *\/     is->video_clock = pts;   } else {     \/* if we aren't given a pts, set it to the clock *\/     pts = is->video_clock;   }   \/* update the video clock *\/   frame_delay = av_q2d(is->video_ctx->time_base);   \/* if we are repeating a frame, adjust clock accordingly *\/   frame_delay += src_frame->repeat_pict * (frame_delay * 0.5);   is->video_clock += frame_delay;   return pts; }  int video_thread(void *arg) {   VideoState *is = (VideoState *)arg;   AVPacket pkt1, *packet = &pkt1;   int frameFinished;   AVFrame *pFrame;   double pts;    pFrame = av_frame_alloc();    for(;;) {     if(packet_queue_get(&is->videoq, packet, 1) < 0) {       \/\/ means we quit getting packets       break;     }     if(packet_queue_get(&is->videoq, packet, 1) < 0) {       \/\/ means we quit getting packets       break;     }     pts = 0;      \/\/ Decode video frame     avcodec_decode_video2(is->video_ctx, pFrame, &frameFinished, packet);      if((pts = av_frame_get_best_effort_timestamp(pFrame)) == AV_NOPTS_VALUE) {       pts = av_frame_get_best_effort_timestamp(pFrame);     } else {       pts = 0;     }     pts *= av_q2d(is->video_st->time_base);      \/\/ Did we get a video frame?     if(frameFinished) {       pts = synchronize_video(is, pFrame, pts);       if(queue_picture(is, pFrame, pts) < 0) { \tbreak;       }     }     av_free_packet(packet);   }   av_frame_free(&pFrame);   return 0; }  int stream_component_open(VideoState *is, int stream_index) {    AVFormatContext *pFormatCtx = is->pFormatCtx;   AVCodecContext *codecCtx = NULL;   AVCodec *codec = NULL;   SDL_AudioSpec wanted_spec, spec;    if(stream_index < 0 || stream_index >= pFormatCtx->nb_streams) {     return -1;   }    codec = avcodec_find_decoder(pFormatCtx->streams[stream_index]->codec->codec_id);   if(!codec) {     fprintf(stderr, "Unsupported codec!\\n");     return -1;   }    codecCtx = avcodec_alloc_context3(codec);   if(avcodec_copy_context(codecCtx, pFormatCtx->streams[stream_index]->codec) != 0) {     fprintf(stderr, "Couldn't copy codec context");     return -1; \/\/ Error copying codec context   }     if(codecCtx->codec_type == AVMEDIA_TYPE_AUDIO) {     \/\/ Set audio settings from codec info     wanted_spec.freq = codecCtx->sample_rate;     wanted_spec.format = AUDIO_S16SYS;     wanted_spec.channels = codecCtx->channels;     wanted_spec.silence = 0;     wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE;     wanted_spec.callback = audio_callback;     wanted_spec.userdata = is;          if(SDL_OpenAudio(&wanted_spec, &spec) < 0) {       fprintf(stderr, "SDL_OpenAudio: %s\\n", SDL_GetError());       return -1;     }     is->audio_hw_buf_size = spec.size;   }   if(avcodec_open2(codecCtx, codec, NULL) < 0) {     fprintf(stderr, "Unsupported codec!\\n");     return -1;   }    switch(codecCtx->codec_type) {   case AVMEDIA_TYPE_AUDIO:     is->audioStream = stream_index;     is->audio_st = pFormatCtx->streams[stream_index];     is->audio_ctx = codecCtx;     is->audio_buf_size = 0;     is->audio_buf_index = 0;     memset(&is->audio_pkt, 0, sizeof(is->audio_pkt));     packet_queue_init(&is->audioq);     SDL_PauseAudio(0);     break;   case AVMEDIA_TYPE_VIDEO:     is->videoStream = stream_index;     is->video_st = pFormatCtx->streams[stream_index];     is->video_ctx = codecCtx;      is->frame_timer = (double)av_gettime() \/ 1000000.0;     is->frame_last_delay = 40e-3;     is->video_current_pts_time = av_gettime();      packet_queue_init(&is->videoq);     is->video_tid = SDL_CreateThread(video_thread, is);     is->sws_ctx = sws_getContext(is->video_ctx->width, is->video_ctx->height, \t\t\t\t is->video_ctx->pix_fmt, is->video_ctx->width, \t\t\t\t is->video_ctx->height, PIX_FMT_YUV420P, \t\t\t\t SWS_BILINEAR, NULL, NULL, NULL \t\t\t\t );     break;   default:     break;   } }  int decode_thread(void *arg) {    VideoState *is = (VideoState *)arg;   AVFormatContext *pFormatCtx;   AVPacket pkt1, *packet = &pkt1;    int video_index = -1;   int audio_index = -1;   int i;    is->videoStream=-1;   is->audioStream=-1;    global_video_state = is;    \/\/ Open video file   if(avformat_open_input(&pFormatCtx, is->filename, NULL, NULL)!=0)     return -1; \/\/ Couldn't open file    is->pFormatCtx = pFormatCtx;      \/\/ Retrieve stream information   if(avformat_find_stream_info(pFormatCtx, NULL)<0)     return -1; \/\/ Couldn't find stream information      \/\/ Dump information about file onto standard error   av_dump_format(pFormatCtx, 0, is->filename, 0);      \/\/ Find the first video stream    for(i=0; i<pFormatCtx->nb_streams; i++) {     if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO &&        video_index < 0) {       video_index=i;     }     if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO &&        audio_index < 0) {       audio_index=i;     }   }   if(audio_index >= 0) {     stream_component_open(is, audio_index);   }   if(video_index >= 0) {     stream_component_open(is, video_index);   }       if(is->videoStream < 0 || is->audioStream < 0) {     fprintf(stderr, "%s: could not open codecs\\n", is->filename);     goto fail;   }    \/\/ main decode loop    for(;;) {     if(is->quit) {       break;     }     \/\/ seek stuff goes here     if(is->seek_req) {       int stream_index= -1;       int64_t seek_target = is->seek_pos;        if     (is->videoStream >= 0) stream_index = is->videoStream;       else if(is->audioStream >= 0) stream_index = is->audioStream;        if(stream_index>=0){ \tseek_target= av_rescale_q(seek_target, AV_TIME_BASE_Q, \t\t\t\t  pFormatCtx->streams[stream_index]->time_base);       }       if(av_seek_frame(is->pFormatCtx, stream_index,  \t\t       seek_target, is->seek_flags) < 0) { \tfprintf(stderr, "%s: error while seeking\\n", \t\tis->pFormatCtx->filename);       } else {  \tif(is->audioStream >= 0) { \t  packet_queue_flush(&is->audioq); \t  packet_queue_put(&is->audioq, &flush_pkt); \t} \tif(is->videoStream >= 0) { \t  packet_queue_flush(&is->videoq); \t  packet_queue_put(&is->videoq, &flush_pkt); \t}       }       is->seek_req = 0;     }      if(is->audioq.size > MAX_AUDIOQ_SIZE ||        is->videoq.size > MAX_VIDEOQ_SIZE) {       SDL_Delay(10);       continue;     }     if(av_read_frame(is->pFormatCtx, packet) < 0) {       if(is->pFormatCtx->pb->error == 0) { \tSDL_Delay(100); \/* no error; wait for user input *\/ \tcontinue;       } else { \tbreak;       }     }     \/\/ Is this a packet from the video stream?     if(packet->stream_index == is->videoStream) {       packet_queue_put(&is->videoq, packet);     } else if(packet->stream_index == is->audioStream) {       packet_queue_put(&is->audioq, packet);     } else {       av_free_packet(packet);     }   }   \/* all done - wait for it *\/   while(!is->quit) {     SDL_Delay(100);   }   fail:   if(1){     SDL_Event event;     event.type = FF_QUIT_EVENT;     event.user.data1 = is;     SDL_PushEvent(&event);   }   return 0; }  void stream_seek(VideoState *is, int64_t pos, int rel) {    if(!is->seek_req) {     is->seek_pos = pos;     is->seek_flags = rel < 0 ? AVSEEK_FLAG_BACKWARD : 0;     is->seek_req = 1;   } }  int main(int argc, char *argv[]) {    SDL_Event       event;    VideoState      *is;    is = av_mallocz(sizeof(VideoState));    if(argc < 2) {     fprintf(stderr, "Usage: test <file>\\n");     exit(1);   }   \/\/ Register all formats and codecs   av_register_all();      if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {     fprintf(stderr, "Could not initialize SDL - %s\\n", SDL_GetError());     exit(1);   }    \/\/ Make a screen to put our video #ifndef __DARWIN__         screen = SDL_SetVideoMode(640, 480, 0, 0); #else         screen = SDL_SetVideoMode(640, 480, 24, 0); #endif   if(!screen) {     fprintf(stderr, "SDL: could not set video mode - exiting\\n");     exit(1);   }    screen_mutex = SDL_CreateMutex();    av_strlcpy(is->filename, argv[1], sizeof(is->filename));    is->pictq_mutex = SDL_CreateMutex();   is->pictq_cond = SDL_CreateCond();    schedule_refresh(is, 40);    is->av_sync_type = DEFAULT_AV_SYNC_TYPE;   is->parse_tid = SDL_CreateThread(decode_thread, is);   if(!is->parse_tid) {     av_free(is);     return -1;   }    av_init_packet(&flush_pkt);   flush_pkt.data = "FLUSH";    for(;;) {     double incr, pos;     SDL_WaitEvent(&event);     switch(event.type) {     case SDL_KEYDOWN:       switch(event.key.keysym.sym) {       case SDLK_LEFT: \tincr = -10.0; \tgoto do_seek;       case SDLK_RIGHT: \tincr = 10.0; \tgoto do_seek;       case SDLK_UP: \tincr = 60.0; \tgoto do_seek;       case SDLK_DOWN: \tincr = -60.0; \tgoto do_seek;       do_seek: \tif(global_video_state) { \t  pos = get_master_clock(global_video_state); \t  pos += incr; \t  stream_seek(global_video_state, (int64_t)(pos * AV_TIME_BASE), incr); \t} \tbreak;       default: \tbreak;       }       break;     case FF_QUIT_EVENT:     case SDL_QUIT:       is->quit = 1;       \/*        * If the video has finished playing, then both the picture and        * audio queues are waiting for more data.  Make them stop        * waiting and terminate normally.        *\/       SDL_CondSignal(is->audioq.cond);       SDL_CondSignal(is->videoq.cond);       SDL_Quit();       return 0;       break;     case FF_REFRESH_EVENT:       video_refresh_timer(event.user.data1);       break;     default:       break;     }   }   return 0;  } <\/code><\/pre>\n<\/div><\/div>\n
  <\/p>\n
\u041e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0430 \u043a\u043e\u043c\u0430\u043d\u0434\u044b \u043f\u043e\u0438\u0441\u043a\u0430<\/h3>\n
  \u0422\u0435\u043f\u0435\u0440\u044c \u043c\u044b \u0441\u043e\u0431\u0438\u0440\u0430\u0435\u043c\u0441\u044f \u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0434\u043b\u044f \u043f\u043e\u0438\u0441\u043a\u0430 \u0432 \u043d\u0430\u0448\u0435\u043c \u043f\u043b\u0435\u0435\u0440\u0435, \u043f\u043e\u0442\u043e\u043c\u0443 \u0447\u0442\u043e \u044d\u0442\u043e \u0440\u0435\u0430\u043b\u044c\u043d\u043e \u0440\u0430\u0437\u0434\u0440\u0430\u0436\u0430\u0435\u0442, \u043a\u043e\u0433\u0434\u0430 \u043d\u0435\u043b\u044c\u0437\u044f \u043f\u0435\u0440\u0435\u043c\u043e\u0442\u0430\u0442\u044c \u0444\u0438\u043b\u044c\u043c \u043d\u0430\u0437\u0430\u0434. \u041a\u0440\u043e\u043c\u0435 \u0442\u043e\u0433\u043e, \u043c\u044b \u0443\u0432\u0438\u0434\u0438\u043c, \u043d\u0430\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043b\u0435\u0433\u043a\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0444\u0443\u043d\u043a\u0446\u0438\u044e av_seek_frame<\/b>.<\/p>\n
  \u041c\u044b \u0441\u043e\u0431\u0438\u0440\u0430\u0435\u043c\u0441\u044f \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u0442\u0430\u043a, \u0447\u0442\u043e\u0431\u044b \u0441\u0442\u0440\u0435\u043b\u043a\u0438 \u043d\u0430 \u043a\u043b\u0430\u0432\u0438\u0430\u0442\u0443\u0440\u0435 \u00ab\u0432\u043b\u0435\u0432\u043e\u00bb \u0438 \u00ab\u0432\u043f\u0440\u0430\u0432\u043e\u00bb \u043f\u0440\u043e\u043a\u0440\u0443\u0447\u0438\u0432\u0430\u043b\u0438 \u0444\u0438\u043b\u044c\u043c \u0432\u043f\u0435\u0440\u0435\u0434 \u0438 \u043d\u0430\u0437\u0430\u0434 \u043d\u0435\u043c\u043d\u043e\u0433\u043e, \u0430 \u0441\u0442\u0440\u0435\u043b\u043a\u0438 \u00ab\u0432\u0432\u0435\u0440\u0445\u00bb \u0438 \u00ab\u0432\u043d\u0438\u0437\u00bb \u2014 \u0443\u0436\u0435 \u0431\u043e\u043b\u0435\u0435 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e. \u00ab\u041d\u0435\u043c\u043d\u043e\u0433\u043e\u00bb \u2014 \u044d\u0442\u043e \u0431\u0443\u0434\u0435\u0442 10 \u0441\u0435\u043a\u0443\u043d\u0434, \u0430 \u00ab\u043c\u043d\u043e\u0433\u043e\u00bb \u2014 \u0432\u0441\u0435 60. \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u043d\u0430\u043c \u043d\u0443\u0436\u043d\u043e \u043d\u0430\u0441\u0442\u0440\u043e\u0438\u0442\u044c \u043d\u0430\u0448 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 \u0446\u0438\u043a\u043b, \u0447\u0442\u043e\u0431\u044b \u043e\u043d \u043f\u0435\u0440\u0435\u0445\u0432\u0430\u0442\u044b\u0432\u0430\u043b \u0441\u043e\u0431\u044b\u0442\u0438\u044f \u043d\u0430\u0436\u0430\u0442\u0438\u044f \u043a\u043b\u0430\u0432\u0438\u0448. \u041d\u043e \u0434\u0435\u043b\u043e \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u043a\u043e\u0433\u0434\u0430 \u043c\u044b \u043f\u043e\u043b\u0443\u0447\u0430\u0435\u043c \u043d\u0430\u0436\u0430\u0442\u0438\u0435 \u043a\u043b\u0430\u0432\u0438\u0448\u0438, \u043c\u044b \u043d\u0435 \u043c\u043e\u0436\u0435\u043c \u0432\u044b\u0437\u0432\u0430\u0442\u044c av_seek_frame<\/b> \u043d\u0430\u043f\u0440\u044f\u043c\u0443\u044e. \u042d\u0442\u043e \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u043d\u0430\u0434\u043e \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u0432 \u043d\u0430\u0448\u0435\u043c \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u043c \u0446\u0438\u043a\u043b\u0435 \u0434\u0435\u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f, \u0446\u0438\u043a\u043b\u0435 decode_thread<\/b>. \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u0432\u043c\u0435\u0441\u0442\u043e \u044d\u0442\u043e\u0433\u043e \u043c\u044b \u0434\u043e\u0431\u0430\u0432\u0438\u043c \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u0432 \u043e\u0441\u043d\u043e\u0432\u043d\u0443\u044e \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0443, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0431\u0443\u0434\u0435\u0442 \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u0442\u044c \u043d\u043e\u0432\u0443\u044e \u043f\u043e\u0437\u0438\u0446\u0438\u044e \u0434\u043b\u044f \u043f\u043e\u0438\u0441\u043a\u0430 \u0438 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0444\u043b\u0430\u0433\u0438 \u043f\u043e\u0438\u0441\u043a\u0430:<\/p>\n
  int             seek_req;   int             seek_flags;   int64_t         seek_pos;<\/code><\/pre>\n
  \u0422\u0435\u043f\u0435\u0440\u044c \u043d\u0430\u043c \u043d\u0443\u0436\u043d\u043e \u043d\u0430\u0441\u0442\u0440\u043e\u0438\u0442\u044c \u043d\u0430\u0448 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 \u0446\u0438\u043a\u043b, \u043e\u0442\u043b\u0430\u0432\u043b\u0438\u0432\u0430\u044e\u0449\u0438\u0439 \u043d\u0430\u0436\u0430\u0442\u0438\u044f \u043a\u043b\u0430\u0432\u0438\u0448:<\/p>\n
  for(;;) {     double incr, pos;      SDL_WaitEvent(&event);     switch(event.type) {     case SDL_KEYDOWN:       switch(event.key.keysym.sym) {       case SDLK_LEFT: \tincr = -10.0; \tgoto do_seek;       case SDLK_RIGHT: \tincr = 10.0; \tgoto do_seek;       case SDLK_UP: \tincr = 60.0; \tgoto do_seek;       case SDLK_DOWN: \tincr = -60.0; \tgoto do_seek;       do_seek: \tif(global_video_state) { \t  pos = get_master_clock(global_video_state); \t  pos += incr; \t  stream_seek(global_video_state,                        (int64_t)(pos * AV_TIME_BASE), incr); \t} \tbreak;       default: \tbreak;       }       break;<\/code><\/pre>\n
  \u0427\u0442\u043e\u0431\u044b \u043f\u043e\u0439\u043c\u0430\u0442\u044c \u043d\u0430\u0436\u0430\u0442\u0438\u0435 \u043a\u043b\u0430\u0432\u0438\u0448\u0438, \u0441\u043d\u0430\u0447\u0430\u043b\u0430 \u0441\u043c\u043e\u0442\u0440\u0438\u043c, \u043f\u0440\u043e\u0438\u0437\u043e\u0448\u043b\u043e \u043b\u0438 \u043c\u044b \u0441\u043e\u0431\u044b\u0442\u0438\u0435 SDL_KEYDOWN<\/b>. \u0417\u0430\u0442\u0435\u043c \u043f\u0440\u043e\u0432\u0435\u0440\u044f\u0435\u043c, \u043a\u0430\u043a\u043e\u0439 \u043a\u043b\u044e\u0447 \u043f\u043e\u043b\u0443\u0447\u0435\u043d, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044f event.key.keysym.sym<\/b><\/nobr>. \u041a\u0430\u043a \u0442\u043e\u043b\u044c\u043a\u043e \u043c\u044b \u0443\u0437\u043d\u0430\u0435\u043c, \u0432 \u043a\u0430\u043a\u043e\u043c \u043d\u0430\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0438 \u0438\u0449\u0435\u043c, \u0432\u044b\u0447\u0438\u0441\u043b\u044f\u0435\u043c \u043d\u043e\u0432\u043e\u0435 \u0432\u0440\u0435\u043c\u044f, \u0434\u043e\u0431\u0430\u0432\u043b\u044f\u044f \u043f\u0440\u0438\u0440\u0430\u0449\u0435\u043d\u0438\u0435 \u043a \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044e \u0438\u0437 \u043d\u0430\u0448\u0435\u0439 \u043d\u043e\u0432\u043e\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 get_master_clock<\/b>. \u0417\u0430\u0442\u0435\u043c \u0432\u044b\u0437\u044b\u0432\u0430\u0435\u043c \u0444\u0443\u043d\u043a\u0446\u0438\u044e stream_seek<\/b> \u0434\u043b\u044f \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0438 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439 seek_pos<\/b> \u0438 \u0442.\u0434. \u041a\u043e\u043d\u0432\u0435\u0440\u0442\u0438\u0440\u0443\u0435\u043c \u043d\u0430\u0448\u0435 \u043d\u043e\u0432\u043e\u0435 \u0432\u0440\u0435\u043c\u044f \u0432 \u0435\u0434\u0438\u043d\u0438\u0446\u044b \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0435\u0439 \u043c\u0435\u0442\u043a\u0438 \u0432\u0440\u0435\u043c\u0435\u043d\u0438 avcodec<\/b>. \u041d\u0430\u043f\u043e\u043c\u043d\u0438\u043c, \u0447\u0442\u043e \u0432\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0435 \u043c\u0435\u0442\u043a\u0438 \u0432 \u043f\u043e\u0442\u043e\u043a\u0430\u0445 \u0438\u0437\u043c\u0435\u0440\u044f\u044e\u0442\u0441\u044f \u0432 \u043a\u0430\u0434\u0440\u0430\u0445, \u0430 \u043d\u0435 \u0432 \u0441\u0435\u043a\u0443\u043d\u0434\u0430\u0445, \u043f\u043e \u0442\u0430\u043a\u043e\u0439 \u0444\u043e\u0440\u043c\u0443\u043b\u0435: \u0441\u0435\u043a\u0443\u043d\u0434\u044b<\/b> = \u043a\u0430\u0434\u0440\u044b<\/b> * time_base<\/b>(fps<\/b>).<\/nobr> \u041f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0434\u043b\u044f avcodec<\/b> \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 1000000 \u043a\u0430\u0434\u0440\u043e\u0432 \u0432 \u0441\u0435\u043a\u0443\u043d\u0434\u0443 (\u0442\u0430\u043a\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c, \u043f\u043e\u0437\u0438\u0446\u0438\u044f \u0432 2 \u0441\u0435\u043a\u0443\u043d\u0434\u044b \u0431\u0443\u0434\u0435\u0442 \u0438\u043c\u0435\u0442\u044c \u043c\u0435\u0442\u043a\u0443 \u0432\u0440\u0435\u043c\u0435\u043d\u0438 2000000). \u041f\u043e\u0447\u0435\u043c\u0443 \u043d\u0430\u043c \u043d\u0443\u0436\u043d\u043e \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u0442\u044c \u044d\u0442\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u2014 \u0443\u0432\u0438\u0434\u0438\u043c \u043f\u043e\u0437\u0436\u0435.<\/p>\n
  \u0412\u043e\u0442 \u043d\u0430\u0448\u0430 \u0444\u0443\u043d\u043a\u0446\u0438\u044f stream_seek<\/b>. \u041e\u0431\u0440\u0430\u0442\u0438\u0442\u0435 \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435, \u0447\u0442\u043e \u043c\u044b \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0435\u043c \u0444\u043b\u0430\u0433, \u0435\u0441\u043b\u0438 \u0438\u0434\u0435\u043c \u043d\u0430\u0437\u0430\u0434:<\/p>\n
void stream_seek(VideoState *is, int64_t pos, int rel) {    if(!is->seek_req) {     is->seek_pos = pos;     is->seek_flags = rel < 0 ? AVSEEK_FLAG_BACKWARD : 0;     is->seek_req = 1;   } }<\/code><\/pre>\n
  \u0422\u0435\u043f\u0435\u0440\u044c \u0434\u0430\u0432\u0430\u0439\u0442\u0435 \u043f\u0435\u0440\u0435\u0439\u0434\u0435\u043c \u043a \u043d\u0430\u0448\u0435\u0439 decode_thread<\/b>, \u0433\u0434\u0435 \u0444\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u043c \u043f\u043e\u0438\u0441\u043a. \u0412 \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u0445 \u0444\u0430\u0439\u043b\u0430\u0445 \u043c\u043e\u0436\u043d\u043e \u0437\u0430\u043c\u0435\u0442\u0438\u0442\u044c, \u0447\u0442\u043e \u043c\u044b \u043f\u043e\u043c\u0435\u0442\u0438\u043b\u0438 \u043e\u0431\u043b\u0430\u0441\u0442\u044c \u00ab\u0437\u0434\u0435\u0441\u044c \u0438\u0434\u0451\u0442 \u043f\u043e\u0438\u0441\u043a\u00bb. \u041d\u0443, \u043c\u044b \u0441\u043e\u0431\u0438\u0440\u0430\u0435\u043c\u0441\u044f \u043f\u0440\u044f\u043c\u043e \u0441\u0435\u0439\u0447\u0430\u0441 \u044d\u0442\u043e \u0442\u0430\u043c \u043f\u043e\u043c\u0435\u0441\u0442\u0438\u0442\u044c.<\/p>\n
  \u041f\u043e\u0438\u0441\u043a \u0441\u043e\u0441\u0440\u0435\u0434\u043e\u0442\u043e\u0447\u0435\u043d \u0432\u043e\u043a\u0440\u0443\u0433 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 av_seek_frame<\/b>. \u042d\u0442\u0430 \u0444\u0443\u043d\u043a\u0446\u0438\u044f \u043f\u0440\u0438\u043d\u0438\u043c\u0430\u0435\u0442 \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u0430\u0440\u0433\u0443\u043c\u0435\u043d\u0442\u0430 \u0444\u043e\u0440\u043c\u0430\u0442\u043d\u044b\u0439 \u043a\u043e\u043d\u0442\u0435\u043a\u0441\u0442, \u043f\u043e\u0442\u043e\u043a, \u0432\u0440\u0435\u043c\u0435\u043d\u043d\u0443\u044e \u043c\u0435\u0442\u043a\u0443 \u0438 \u043d\u0430\u0431\u043e\u0440 \u0444\u043b\u0430\u0433\u043e\u0432. \u0424\u0443\u043d\u043a\u0446\u0438\u044f \u0431\u0443\u0434\u0435\u0442 \u0438\u0441\u043a\u0430\u0442\u044c \u043c\u0435\u0442\u043a\u0443 \u0432\u0440\u0435\u043c\u0435\u043d\u0438, \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u0432\u044b \u0435\u0439 \u0434\u0430\u0434\u0438\u0442\u0435. \u0415\u0434\u0438\u043d\u0438\u0446\u0435\u0439 \u043e\u0442\u043c\u0435\u0442\u043a\u0438 \u0432\u0440\u0435\u043c\u0435\u043d\u0438 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f time_base<\/b> \u043f\u043e\u0442\u043e\u043a\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0432\u044b \u043f\u0435\u0440\u0435\u0434\u0430\u0451\u0442\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438. \u0422\u0435\u043c \u043d\u0435 \u043c\u0435\u043d\u0435\u0435, \u0432\u0430\u043c \u043d\u0435 \u043d\u0443\u0436\u043d\u043e \u043f\u0435\u0440\u0435\u0434\u0430\u0432\u0430\u0442\u044c \u0435\u0433\u043e \u0432 \u043f\u043e\u0442\u043e\u043a (\u043e\u0431\u043e\u0437\u043d\u0430\u0447\u0430\u0435\u0442\u0441\u044f \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0435\u0439 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f -1). \u0415\u0441\u043b\u0438 \u0432\u044b \u044d\u0442\u043e \u0441\u0434\u0435\u043b\u0430\u0435\u0442\u0435, time_base<\/b> \u0431\u0443\u0434\u0435\u0442 \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u044c\u0441\u044f \u0432\u043e \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0435\u0439 \u0435\u0434\u0438\u043d\u0438\u0446\u0435 \u0432\u0440\u0435\u043c\u0435\u043d\u0438 avcodec<\/b> \u0438\u043b\u0438 1000000fps. \u0412\u043e\u0442 \u043f\u043e\u0447\u0435\u043c\u0443 \u043c\u044b \u0443\u043c\u043d\u043e\u0436\u0438\u043b\u0438 \u043d\u0430\u0448\u0443 \u043f\u043e\u0437\u0438\u0446\u0438\u044e \u043d\u0430 AV_TIME_BASE<\/b>, \u043a\u043e\u0433\u0434\u0430 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u043b\u0438 seek_pos<\/b>.<\/p>\n
  \u041e\u0434\u043d\u0430\u043a\u043e \u0438\u043d\u043e\u0433\u0434\u0430 \u0432\u044b \u043c\u043e\u0436\u0435\u0442\u0435 (\u0440\u0435\u0434\u043a\u043e) \u0441\u0442\u043e\u043b\u043a\u043d\u0443\u0442\u044c\u0441\u044f \u0441 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u043c\u0438 \u0434\u043b\u044f \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0444\u0430\u0439\u043b\u043e\u0432, \u0435\u0441\u043b\u0438 \u043f\u0435\u0440\u0435\u0434\u0430\u0451\u0442\u0435 av_seek_frame<\/b> \u2212 1<\/nobr> \u0434\u043b\u044f \u043f\u043e\u0442\u043e\u043a\u0430, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u043c\u044b \u0441\u043e\u0431\u0438\u0440\u0430\u0435\u043c\u0441\u044f \u0432\u044b\u0431\u0440\u0430\u0442\u044c \u043f\u0435\u0440\u0432\u044b\u0439 \u043f\u043e\u0442\u043e\u043a \u0432 \u043d\u0430\u0448\u0435\u043c \u0444\u0430\u0439\u043b\u0435 \u0438 \u043f\u0435\u0440\u0435\u0434\u0430\u0442\u044c \u0435\u0433\u043e av_seek_frame<\/b>. \u041d\u0435 \u0437\u0430\u0431\u044b\u0432\u0430\u0439\u0442\u0435, \u0447\u0442\u043e \u043c\u044b \u0434\u043e\u043b\u0436\u043d\u044b \u0438\u0437\u043c\u0435\u043d\u0438\u0442\u044c \u043c\u0430\u0441\u0448\u0442\u0430\u0431 \u043d\u0430\u0448\u0435\u0439 \u043c\u0435\u0442\u043a\u0438 \u0432\u0440\u0435\u043c\u0435\u043d\u0438, \u0447\u0442\u043e\u0431\u044b \u043e\u043a\u0430\u0437\u0430\u0442\u044c\u0441\u044f \u0432 \u043d\u043e\u0432\u043e\u0439 \u00ab\u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u043a\u043e\u043e\u0440\u0434\u0438\u043d\u0430\u0442\u00bb.<\/p>\n
if(is->seek_req) {   int stream_index= -1;   int64_t seek_target = is->seek_pos;    if     (is->videoStream >= 0) stream_index = is->videoStream;   else if(is->audioStream >= 0) stream_index = is->audioStream;    if(stream_index>=0){     seek_target= av_rescale_q(seek_target, AV_TIME_BASE_Q,                       pFormatCtx->streams[stream_index]->time_base);   }   if(av_seek_frame(is->pFormatCtx, stream_index,                      seek_target, is->seek_flags) < 0) {     fprintf(stderr, "%s: error while seeking\\n",             is->pFormatCtx->filename);   } else {      \/* handle packet queues... more later... *\/ <\/code><\/pre>\n
  av_rescale_q<\/b>(a<\/b>, b<\/b>, c<\/b>) \u2014 \u044d\u0442\u043e \u0444\u0443\u043d\u043a\u0446\u0438\u044f, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043c\u0430\u0441\u0448\u0442\u0430\u0431\u0438\u0440\u0443\u0435\u0442 \u0432\u0440\u0435\u043c\u0435\u043d\u043d\u0443\u0301\u044e \u043c\u0435\u0442\u043a\u0443 \u043e\u0442 \u043e\u0434\u043d\u043e\u0439 \u0431\u0430\u0437\u044b \u043a \u0434\u0440\u0443\u0433\u043e\u0439. \u041e\u043d \u0432 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u043c \u0432\u044b\u0447\u0438\u0441\u043b\u044f\u0435\u0442 a<\/b> * b<\/b> \/ c<\/b><\/nobr>, \u043d\u043e \u044d\u0442\u0430 \u0444\u0443\u043d\u043a\u0446\u0438\u044f \u043f\u0440\u0438\u0433\u043e\u0434\u0438\u0442\u0441\u044f, \u043f\u043e\u0442\u043e\u043c\u0443 \u0447\u0442\u043e \u044d\u0442\u043e \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u0435 \u0438\u043d\u043e\u0433\u0434\u0430 \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u043a \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e. AV_TIME_BASE_Q<\/b> \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0434\u0440\u043e\u0431\u043d\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0435\u0439 AV_TIME_BASE<\/b>. \u041e\u043d\u0438 \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u043d\u043e \u0440\u0430\u0437\u043d\u044b\u0435: AV_TIME_BASE<\/b> * time_in_seconds<\/b> = avcodec_timestamp<\/b><\/nobr> \u0438 AV_TIME_BASE_Q<\/b> * avcodec_timestamp<\/b> = time_in_seconds<\/b><\/nobr> (\u043d\u043e \u043e\u0431\u0440\u0430\u0442\u0438\u0442\u0435 \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435, \u0447\u0442\u043e AV_TIME_BASE_Q<\/b> \u043d\u0430 \u0441\u0430\u043c\u043e\u043c \u0434\u0435\u043b\u0435 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043e\u0431\u044a\u0435\u043a\u0442\u043e\u043c AVRational<\/b>, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u043d\u0443\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 q<\/b> \u0432 avcodec<\/b> \u0434\u043b\u044f \u0435\u0433\u043e \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438).<\/p>\n
\u041e\u0447\u0438\u0441\u0442\u043a\u0430 \u0431\u0443\u0444\u0435\u0440\u043e\u0432<\/h3>\n
  \u0418\u0442\u0430\u043a, \u043c\u044b \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e \u043d\u0430\u0441\u0442\u0440\u043e\u0438\u043b\u0438 \u043d\u0430\u0448\u0438 \u043f\u043e\u0438\u0441\u043a\u0438, \u043d\u043e \u043f\u043e\u043a\u0430 \u0435\u0449\u0451 \u043d\u0435 \u0437\u0430\u043a\u043e\u043d\u0447\u0438\u043b\u0438. \u041f\u0440\u0438\u043f\u043e\u043c\u0438\u043d\u0430\u0435\u0442\u0435, \u0443 \u043d\u0430\u0441 \u0432\u0435\u0434\u044c \u0435\u0441\u0442\u044c \u043e\u0447\u0435\u0440\u0435\u0434\u044c, \u043d\u0430\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u0430\u044f \u0434\u043b\u044f \u043d\u0430\u043a\u043e\u043f\u043b\u0435\u043d\u0438\u044f \u043f\u0430\u043a\u0435\u0442\u043e\u0432? \u0422\u0435\u043f\u0435\u0440\u044c, \u043a\u043e\u0433\u0434\u0430 \u043c\u044b \u0432 \u0434\u0440\u0443\u0433\u043e\u0439 \u043c\u0435\u0442\u043a\u0435 \u0432\u0440\u0435\u043c\u0435\u043d\u0438, \u043d\u0443\u0436\u043d\u043e \u043e\u0447\u0438\u0441\u0442\u0438\u0442\u044c \u044d\u0442\u0443 \u043e\u0447\u0435\u0440\u0435\u0434\u044c, \u0438\u043d\u0430\u0447\u0435 \u043f\u043e\u0438\u0441\u043a \u0432 \u0444\u0438\u043b\u044c\u043c\u0435 \u043d\u0435 \u0431\u0443\u0434\u0435\u0442 \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c! \u041a\u0440\u043e\u043c\u0435 \u0442\u043e\u0433\u043e, avcodec<\/b> \u0438\u043c\u0435\u0435\u0442 \u0441\u0432\u043e\u0438 \u0441\u043e\u0431\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u0435 \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0438\u0435 \u0431\u0443\u0444\u0435\u0440\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0442\u0430\u043a\u0436\u0435 \u0434\u043e\u043b\u0436\u043d\u044b \u0431\u044b\u0442\u044c \u043e\u0447\u0438\u0449\u0435\u043d\u044b \u0434\u043b\u044f \u043a\u0430\u0436\u0434\u043e\u0433\u043e \u043f\u043e\u0442\u043e\u043a\u0430.<\/p>\n
  \u0414\u043b\u044f \u044d\u0442\u043e\u0433\u043e \u043d\u0443\u0436\u043d\u043e \u0441\u043d\u0430\u0447\u0430\u043b\u0430 \u043d\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u0444\u0443\u043d\u043a\u0446\u0438\u044e, \u043e\u0447\u0438\u0449\u0430\u044e\u0449\u0443\u044e \u043d\u0430\u0448\u0443 \u043e\u0447\u0435\u0440\u0435\u0434\u044c \u043f\u0430\u043a\u0435\u0442\u043e\u0432. \u0417\u0430\u0442\u0435\u043c \u043d\u0443\u0436\u043d\u043e \u043a\u0430\u043a\u0438\u043c-\u0442\u043e \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u043f\u0440\u043e\u0438\u043d\u0441\u0442\u0440\u0443\u043a\u0442\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0430\u0443\u0434\u0438\u043e- \u0438 \u0432\u0438\u0434\u0435\u043e\u043f\u043e\u0442\u043e\u043a, \u0447\u0442\u043e \u043e\u043d\u0438 \u043e\u0447\u0438\u0449\u0430\u043b\u0438 \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0438\u0435 \u0431\u0443\u0444\u0435\u0440\u044b avcodec<\/b>. \u041c\u044b \u043c\u043e\u0436\u0435\u043c \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u044d\u0442\u043e, \u043f\u043e\u043c\u0435\u0441\u0442\u0438\u0432 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043f\u0430\u043a\u0435\u0442 \u0432 \u043e\u0447\u0435\u0440\u0435\u0434\u044c \u043f\u043e\u0441\u043b\u0435 \u0435\u0433\u043e \u043e\u0447\u0438\u0441\u0442\u043a\u0438, \u0438 \u043a\u043e\u0433\u0434\u0430 \u043e\u043d\u0438 (\u043f\u043e\u0442\u043e\u043a\u0438) \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0430\u0442 \u044d\u0442\u043e\u0442 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043f\u0430\u043a\u0435\u0442, \u043e\u043d\u0438 \u043f\u0440\u043e\u0441\u0442\u043e \u043e\u0447\u0438\u0441\u0442\u044f\u0442 \u0441\u0432\u043e\u0438 \u0431\u0443\u0444\u0435\u0440\u044b.<\/p>\n
  \u0414\u0430\u0432\u0430\u0439\u0442\u0435 \u043d\u0430\u0447\u043d\u0451\u043c \u0441 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0441\u0431\u0440\u043e\u0441\u0430. \u042d\u0442\u043e \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u0434\u043e\u0432\u043e\u043b\u044c\u043d\u043e \u043f\u0440\u043e\u0441\u0442\u043e, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u044f \u043f\u0440\u043e\u0441\u0442\u043e \u043f\u043e\u043a\u0430\u0436\u0443 \u0432\u0430\u043c \u043a\u043e\u0434:<\/p>\n
static void packet_queue_flush(PacketQueue *q) {   AVPacketList *pkt, *pkt1;    SDL_LockMutex(q->mutex);   for(pkt = q->first_pkt; pkt != NULL; pkt = pkt1) {     pkt1 = pkt->next;     av_free_packet(&pkt->pkt);     av_freep(&pkt);   }   q->last_pkt = NULL;   q->first_pkt = NULL;   q->nb_packets = 0;   q->size = 0;   SDL_UnlockMutex(q->mutex); }<\/code><\/pre>\n
  \u0422\u0435\u043f\u0435\u0440\u044c, \u043a\u043e\u0433\u0434\u0430 \u043e\u0447\u0435\u0440\u0435\u0434\u044c \u043e\u0447\u0438\u0449\u0435\u043d\u0430, \u0434\u043e\u0431\u0430\u0432\u0438\u043c \u043d\u0430\u0448 \u00ab\u043e\u0447\u0438\u0449\u0430\u044e\u0449\u0438\u0439 \u043f\u0430\u043a\u0435\u0442\u00bb. \u041d\u043e \u0441\u043d\u0430\u0447\u0430\u043b\u0430 \u043d\u0435\u043f\u043b\u043e\u0445\u043e \u0431\u044b \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c, \u0447\u0442\u043e \u044d\u0442\u043e \u0442\u0430\u043a\u043e\u0435, \u0438 \u0441\u043e\u0437\u0434\u0430\u0442\u044c \u0435\u0433\u043e:<\/p>\n
AVPacket flush_pkt;  main() {   ...   av_init_packet(&flush_pkt);   flush_pkt.data = "FLUSH";   ... }<\/code><\/pre>\n
  \u0422\u0435\u043f\u0435\u0440\u044c \u043f\u043e\u043c\u0435\u0449\u0430\u0435\u043c \u044d\u0442\u043e\u0442 \u043f\u0430\u043a\u0435\u0442 \u0432 \u043e\u0447\u0435\u0440\u0435\u0434\u044c:<\/p>\n
  } else {     if(is->audioStream >= 0) {       packet_queue_flush(&is->audioq);       packet_queue_put(&is->audioq, &flush_pkt);     }     if(is->videoStream >= 0) {       packet_queue_flush(&is->videoq);       packet_queue_put(&is->videoq, &flush_pkt);     }   }   is->seek_req = 0; }<\/code><\/pre>\n
  (\u042d\u0442\u043e\u0442 \u0444\u0440\u0430\u0433\u043c\u0435\u043d\u0442 \u043a\u043e\u0434\u0430 \u043f\u0440\u043e\u0434\u043e\u043b\u0436\u0430\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0434\u0435\u043d\u043d\u044b\u0439 \u0432\u044b\u0448\u0435 \u0444\u0440\u0430\u0433\u043c\u0435\u043d\u0442 \u043a\u043e\u0434\u0430 \u0434\u043b\u044f decode_thread<\/b>.) \u041d\u0430\u043c \u0442\u0430\u043a\u0436\u0435 \u043d\u0443\u0436\u043d\u043e \u0438\u0437\u043c\u0435\u043d\u0438\u0442\u044c packet_queue_put<\/b>, \u0447\u0442\u043e\u0431\u044b \u043c\u044b \u043d\u0435 \u0434\u0443\u0431\u043b\u0438\u0440\u043e\u0432\u0430\u043b\u0438 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043f\u0430\u043a\u0435\u0442 \u0434\u043b\u044f \u043e\u0447\u0438\u0441\u0442\u043a\u0438:<\/p>\n
int packet_queue_put(PacketQueue *q, AVPacket *pkt) {    AVPacketList *pkt1;   if(pkt != &flush_pkt && av_dup_packet(pkt) < 0) {     return -1;   }<\/code><\/pre>\n
  \u0418 \u0437\u0430\u0442\u0435\u043c \u0432 \u0430\u0443\u0434\u0438\u043e- \u0438 \u0432\u0438\u0434\u0435\u043e\u043f\u043e\u0442\u043e\u043a\u0435 \u043c\u044b \u043f\u043e\u043c\u0435\u0449\u0430\u0435\u043c \u044d\u0442\u043e\u0442 \u0432\u044b\u0437\u043e\u0432 \u0432 avcodec_flush_buffers<\/b> \u0441\u0440\u0430\u0437\u0443 \u043f\u043e\u0441\u043b\u0435 packet_queue_get<\/b>:<\/p>\n
    if(packet_queue_get(&is->audioq, pkt, 1) < 0) {       return -1;     }     if(pkt->data == flush_pkt.data) {       avcodec_flush_buffers(is->audio_st->codec);       continue;     }<\/code><\/pre>\n
  \u041f\u0440\u0438\u0432\u0435\u0434\u0435\u043d\u043d\u044b\u0439 \u0432\u044b\u0448\u0435 \u0444\u0440\u0430\u0433\u043c\u0435\u043d\u0442 \u043a\u043e\u0434\u0430 \u0442\u043e\u0447\u043d\u043e \u0442\u0430\u043a\u043e\u0439 \u0436\u0435 \u0434\u043b\u044f \u0432\u0438\u0434\u0435\u043e\u043f\u043e\u0442\u043e\u043a\u0430, \u0441 \u0437\u0430\u043c\u0435\u043d\u043e\u0439 \u00abaudio\u00bb \u043d\u0430 \u00abvideo\u00bb.<\/p>\n
  \u042d\u0442\u043e \u0441\u0430\u043c\u043e\u0435 \u043e\u043d\u043e! \u041c\u044b \u0441\u0434\u0435\u043b\u0430\u043b\u0438 \u044d\u0442\u043e! \u0421\u043a\u043e\u043c\u043f\u0438\u043b\u0438\u0440\u0443\u0439\u0442\u0435 \u0432\u0430\u0448 \u043f\u043b\u0435\u0435\u0440:<\/p>\n
gcc -o tutorial07 tutorial07.c -lavutil -lavformat -lavcodec -lswscale -lz -lm \\ `sdl-config --cflags --libs`<\/code><\/pre>\n
  \u0438 \u043d\u0430\u0441\u043b\u0430\u0436\u0434\u0430\u0439\u0442\u0435\u0441\u044c \u0432\u0430\u0448\u0438\u043c \u043a\u0438\u043d\u043e\u043f\u043b\u0435\u0435\u0440\u043e\u043c, \u0441\u0434\u0435\u043b\u0430\u043d\u043d\u044b\u043c \u043c\u0435\u043d\u0435\u0435 \u0447\u0435\u043c \u0437\u0430 1000 \u0441\u0442\u0440\u043e\u043a C!<\/p>\n
  \u0425\u043e\u0442\u044f, \u043a\u043e\u043d\u0435\u0447\u043d\u043e, \u043e\u0441\u0442\u0430\u0451\u0442\u0441\u044f \u043a\u0443\u0447\u0430 \u0432\u0435\u0449\u0435\u0439, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043c\u043e\u0436\u043d\u043e \u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u0438\u043b\u0438 \u0443\u043b\u0443\u0447\u0448\u0438\u0442\u044c.<\/a><\/p>\n
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\u041f\u043e\u0441\u043b\u0435\u0441\u043b\u043e\u0432\u0438\u0435 \u2190<\/a> \u21d1<\/a> \u2192<\/a><\/h2>\n
  \u0418\u0442\u0430\u043a, \u0443 \u043d\u0430\u0441 \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0441\u044f \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0438\u0439 \u043f\u043b\u0435\u0435\u0440, \u043d\u043e \u043e\u043d, \u043a\u043e\u043d\u0435\u0447\u043d\u043e, \u043d\u0435 \u0442\u0430\u043a \u0445\u043e\u0440\u043e\u0448, \u043a\u0430\u043a\u0438\u043c \u043c\u043e\u0433 \u0431\u044b \u0431\u044b\u0442\u044c. \u041c\u043e\u0436\u043d\u043e \u0431\u044b\u043b\u043e \u0431\u044b \u0435\u0449\u0451 \u0434\u043e\u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u043d\u0430\u043f\u0438\u043b\u044c\u043d\u0438\u043a\u043e\u043c \u0438 \u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u043c\u043d\u043e\u0433\u043e \u0447\u0435\u0433\u043e \u043f\u043e\u043b\u0435\u0437\u043d\u043e\u0433\u043e:<\/p>\n