FFMEPG -- A ffmpeg and SDL Tutorial : tutorial05

修改了同步播放ffmpeg问题。并且增加可以放大视频。

 // 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
 // Use
 //
 // gcc -o tutorial05 tutorial05.c -lavformat -lavcodec -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
 // tutorial05 myvideofile.mpg
 //
 // to play the video.

 #include <libavcodec/avcodec.h>
 #include <libavformat/avformat.h>

 #include <SDL/SDL.h>
 #include <SDL/SDL_thread.h>
 #include <libswscale/swscale.h>
 #define W 1920
 #define H 1080
 #ifdef __MINGW32__
 #undef main /* Prevents SDL from overriding main() */
 #endif

 #include <stdio.h>
 #include <math.h>

 #define SDL_AUDIO_BUFFER_SIZE 1024

 #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 FF_ALLOC_EVENT   (SDL_USEREVENT)
 #define FF_REFRESH_EVENT (SDL_USEREVENT + 1)
 #define FF_QUIT_EVENT (SDL_USEREVENT + 2)

 #define VIDEO_PICTURE_QUEUE_SIZE 1

 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;

   double          audio_clock;
   AVStream        *audio_st;
   PacketQueue     audioq;
   uint8_t         audio_buf[(AVCODEC_MAX_AUDIO_FRAME_SIZE * ) / ];
   unsigned int    audio_buf_size;
   unsigned int    audio_buf_index;
   AVPacket        audio_pkt;
   uint8_t         *audio_pkt_data;
   int             audio_pkt_size;
   int             audio_hw_buf_size;
   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
   AVStream        *video_st;
   PacketQueue     videoq;

   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[];
   int             quit;
 } VideoState;

 SDL_Surface     *screen;

 /* 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, , 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) < ) {
     return -;
   }
   pkt1 = av_malloc(sizeof(AVPacketList));
   if (!pkt1)
     return -;
   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 ;
 }
 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 = -;
       break;
     }

     pkt1 = q->first_pkt;
     if (pkt1) {
       q->first_pkt = pkt1->next;
       if (!q->first_pkt)
     q->last_pkt = NULL;
       q->nb_packets--;
       q->size -= pkt1->pkt.size;
       *pkt = pkt1->pkt;
       av_free(pkt1);
       ret = ;
       break;
     } else if (!block) {
       ret = ;
       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 = ;
   n = is->audio_st->codec->channels * ;
   if(is->audio_st) {
     bytes_per_sec = is->audio_st->codec->sample_rate * n;
   }
   if(bytes_per_sec) {
     pts -= (double)hw_buf_size / bytes_per_sec;
   }
   return pts;
 }

 int audio_decode_frame(VideoState *is, uint8_t *audio_buf, int buf_size, double *pts_ptr) {

   int len1, data_size, n;
   AVPacket *pkt = &is->audio_pkt;
   double pts;

   for(;;) {
     while(is->audio_pkt_size > ) {
       data_size = buf_size;
       len1 = avcodec_decode_audio2(is->audio_st->codec,
                   (int16_t *)audio_buf, &data_size,
                   is->audio_pkt_data, is->audio_pkt_size);
       if(len1 < ) {
     /* if error, skip frame */
     is->audio_pkt_size = ;
     break;
       }
       is->audio_pkt_data += len1;
       is->audio_pkt_size -= len1;
       if(data_size <= ) {
     /* No data yet, get more frames */
     continue;
       }
       pts = is->audio_clock;
       *pts_ptr = pts;
       n =  * is->audio_st->codec->channels;
       is->audio_clock += (double)data_size /
     (double)(n * is->audio_st->codec->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 -;
     }
     /* next packet */
     if(packet_queue_get(&is->audioq, pkt, ) < ) {
       return -;
     }
     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 > ) {
     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 < ) {
     /* If error, output silence */
     is->audio_buf_size = ;
     memset(is->audio_buf, , is->audio_buf_size);
       } else {
     is->audio_buf_size = audio_size;
       }
       is->audio_buf_index = ;
     }
     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 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;
   AVPicture pict;
   float aspect_ratio;
   int w, h, x, y;
   int i;

   vp = &is->pictq[is->pictq_rindex];
   if(vp->bmp) {
     if(is->video_st->codec->sample_aspect_ratio.num == ) {
       aspect_ratio = ;
     } else {
       aspect_ratio = av_q2d(is->video_st->codec->sample_aspect_ratio) *
     is->video_st->codec->width / is->video_st->codec->height;
     }
     if(aspect_ratio <= 0.0) {
       aspect_ratio = (float)is->video_st->codec->width /
     (float)is->video_st->codec->height;
     }
     h = screen->h;
     w = ((int)rint(h * aspect_ratio)) & -;
     if(w > screen->w) {
       w = screen->w;
       h = ((int)rint(w / aspect_ratio)) & -;
     }
     x = (screen->w - w) / ;
     y = (screen->h - h) / ;
 //x=0;y=0;w=0;h=0;
     rect.x = x;
     rect.y = y;
     rect.w = w;
     rect.h = h;
     SDL_DisplayYUVOverlay(vp->bmp, &rect);
   }
 }

 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 == ) {
       schedule_refresh(is, );
     } else {
       vp = &is->pictq[is->pictq_rindex];

       delay = vp->pts - is->frame_last_pts; /* the pts from last time */
       if(delay <=  || delay >= 1.0) {
     /* if incorrect delay, use previous one */
     delay = 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 */
       ref_clock = get_audio_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 = ;
     } else if(diff >= sync_threshold) {
       delay =  * delay;
     }
       }
       is->frame_timer += delay;
       /* computer the REAL delay */
       actual_delay = is->frame_timer - (av_gettime() / 1000000.0);
       if(actual_delay < 0.010) {
     /* Really it should skip the picture instead */
     actual_delay = 0.010;
       }
       schedule_refresh(is, (int)(actual_delay *  + 0.5));
       /* show the picture! */
       video_display(is);

       /* update queue for next picture! */
       if(++is->pictq_rindex == VIDEO_PICTURE_QUEUE_SIZE) {
     is->pictq_rindex = ;
       }
       SDL_LockMutex(is->pictq_mutex);
       is->pictq_size--;
       SDL_CondSignal(is->pictq_cond);
       SDL_UnlockMutex(is->pictq_mutex);
     }
   } else {
     schedule_refresh(is, );
   }
 }

 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
   vp->bmp = SDL_CreateYUVOverlay(W,
                 H,
                  SDL_YV12_OVERLAY,
                  screen);
   vp->width = W;
   vp->height = H;

   SDL_LockMutex(is->pictq_mutex);
   vp->allocated = ;
   SDL_CondSignal(is->pictq_cond);
   SDL_UnlockMutex(is->pictq_mutex);

 }

 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 &&
     !is->quit) {
     SDL_CondWait(is->pictq_cond, is->pictq_mutex);
   }
   SDL_UnlockMutex(is->pictq_mutex);

   if(is->quit)
     return -;

   // windex is set to 0 initially
   vp = &is->pictq[is->pictq_windex];

   /* allocate or resize the buffer! */
   if(!vp->bmp ||
      vp->width != is->video_st->codec->width ||
      vp->height != is->video_st->codec->height) {
     SDL_Event event;

     vp->allocated = ;
     /* we have to do it in the main thread */
     event.type = FF_ALLOC_EVENT;
     event.user.data1 = is;
     SDL_PushEvent(&event);

     /* wait until we have a picture allocated */
     SDL_LockMutex(is->pictq_mutex);
     while(!vp->allocated && !is->quit) {
       SDL_CondWait(is->pictq_cond, is->pictq_mutex);
     }
     SDL_UnlockMutex(is->pictq_mutex);
     if(is->quit) {
       return -;
     }
   }
   /* We have a place to put our picture on the queue */
   /* If we are skipping a frame, do we set this to null
      but still return vp->allocated = 1? */

   if(vp->bmp) {

     SDL_LockYUVOverlay(vp->bmp);

     dst_pix_fmt = PIX_FMT_YUV420P;
     /* point pict at the queue */

     pict.data[] = vp->bmp->pixels[];
     pict.data[] = vp->bmp->pixels[];
     pict.data[] = vp->bmp->pixels[];

     pict.linesize[] = vp->bmp->pitches[];
     pict.linesize[] = vp->bmp->pitches[];
     pict.linesize[] = vp->bmp->pitches[];

     // Convert the image into YUV format that SDL uses
 //    img_convert(&pict, dst_pix_fmt,
 //        (AVPicture *)pFrame, is->video_st->codec->pix_fmt,
 //        is->video_st->codec->width, is->video_st->codec->height);

 #if 1//zhibin

     static struct SwsContext *img_convert_ctx;

         img_convert_ctx = sws_getContext(is->video_st->codec->width, is->video_st->codec->height, is->video_st->codec->pix_fmt, W,H,
 //                                                                PIX_FMT_RGB24,
                 PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL );
         sws_scale(img_convert_ctx, (const uint8_t* const *) pFrame->data, pFrame->linesize, , is->video_st->codec->height, pict.data,
                 pict.linesize);
 #endif

     SDL_UnlockYUVOverlay(vp->bmp);
     vp->pts = pts;

     /* now we inform our display thread that we have a pic ready */
     if(++is->pictq_windex == VIDEO_PICTURE_QUEUE_SIZE) {
       is->pictq_windex = ;
     }
     SDL_LockMutex(is->pictq_mutex);
     is->pictq_size++;
     SDL_UnlockMutex(is->pictq_mutex);
   }
   return ;
 }

 double synchronize_video(VideoState *is, AVFrame *src_frame, double pts) {

   double frame_delay;

   if(pts != ) {
     /* 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_st->codec->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;
 }
 uint64_t global_video_pkt_pts = AV_NOPTS_VALUE;

 /* These are called whenever we allocate a frame
  * buffer. We use this to store the global_pts in
  * a frame at the time it is allocated.
  */
 int our_get_buffer(struct AVCodecContext *c, AVFrame *pic) {
   int ret = avcodec_default_get_buffer(c, pic);
   uint64_t *pts = av_malloc(sizeof(uint64_t));
   *pts = global_video_pkt_pts;
   pic->opaque = pts;
   return ret;
 }
 void our_release_buffer(struct AVCodecContext *c, AVFrame *pic) {
   if(pic) av_freep(&pic->opaque);
   avcodec_default_release_buffer(c, pic);
 }

 int video_thread(void *arg) {
   VideoState *is = (VideoState *)arg;
   AVPacket pkt1, *packet = &pkt1;
   int len1, frameFinished;
   AVFrame *pFrame;
   double pts;

   pFrame = avcodec_alloc_frame();

   for(;;) {
     if(packet_queue_get(&is->videoq, packet, ) < ) {
       // means we quit getting packets
       break;
     }
     pts = ;

     // Save global pts to be stored in pFrame in first call
     global_video_pkt_pts = packet->pts;
     // Decode video frame
     len1 = avcodec_decode_video(is->video_st->codec, pFrame, &frameFinished,
                 packet->data, packet->size);
     if(packet->dts == AV_NOPTS_VALUE
        && pFrame->opaque && *(uint64_t*)pFrame->opaque != AV_NOPTS_VALUE) {
       pts = *(uint64_t *)pFrame->opaque;
     } else if(packet->dts != AV_NOPTS_VALUE) {
       pts = packet->dts;
     } else {
       pts = ;
     }
     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) < ) {
     break;
       }
     }
     av_free_packet(packet);
   }
   av_free(pFrame);
   return ;
 }

 int stream_component_open(VideoState *is, int stream_index) {

   AVFormatContext *pFormatCtx = is->pFormatCtx;
   AVCodecContext *codecCtx;
   AVCodec *codec;
   SDL_AudioSpec wanted_spec, spec;

   if(stream_index <  || stream_index >= pFormatCtx->nb_streams) {
     return -;
   }

   // Get a pointer to the codec context for the video stream
   codecCtx = pFormatCtx->streams[stream_index]->codec;

   if(codecCtx->codec_type == CODEC_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 = ;
     wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE;
     wanted_spec.callback = audio_callback;
     wanted_spec.userdata = is;

     if(SDL_OpenAudio(&wanted_spec, &spec) < ) {
       fprintf(stderr, "SDL_OpenAudio: %s\n", SDL_GetError());
       return -;
     }
     is->audio_hw_buf_size = spec.size;
   }
   codec = avcodec_find_decoder(codecCtx->codec_id);

   if(!codec || (avcodec_open(codecCtx, codec) < )) {
     fprintf(stderr, "Unsupported codec!\n");
     return -;
   }

   switch(codecCtx->codec_type) {
   case CODEC_TYPE_AUDIO:
     is->audioStream = stream_index;
     is->audio_st = pFormatCtx->streams[stream_index];
     is->audio_buf_size = ;
     is->audio_buf_index = ;
     memset(&is->audio_pkt, , sizeof(is->audio_pkt));
     packet_queue_init(&is->audioq);
     SDL_PauseAudio();
     break;
   case CODEC_TYPE_VIDEO:
     is->videoStream = stream_index;
     is->video_st = pFormatCtx->streams[stream_index];

     is->frame_timer = (double)av_gettime() / 1000000.0;
     is->frame_last_delay = 40e-;

     packet_queue_init(&is->videoq);
     is->video_tid = SDL_CreateThread(video_thread, is);
     codecCtx->get_buffer = our_get_buffer;
     codecCtx->release_buffer = our_release_buffer;
     break;
   default:
     break;
   }

 }

 int decode_interrupt_cb(void) {
   return (global_video_state && global_video_state->quit);
 }

 int decode_thread(void *arg) {

   VideoState *is = (VideoState *)arg;
   AVFormatContext *pFormatCtx;
   AVPacket pkt1, *packet = &pkt1;

   int video_index = -;
   int audio_index = -;
   int i;

   is->videoStream=-;
   is->audioStream=-;

   global_video_state = is;
   // will interrupt blocking functions if we quit!
   url_set_interrupt_cb(decode_interrupt_cb);

   // Open video file
   if(av_open_input_file(&pFormatCtx, is->filename, NULL, , NULL)!=)
     return -; // Couldn't open file

   is->pFormatCtx = pFormatCtx;

   // Retrieve stream information
   if(av_find_stream_info(pFormatCtx)<)
     return -; // Couldn't find stream information

   // Dump information about file onto standard error
   dump_format(pFormatCtx, , is->filename, );

   // Find the first video stream

   for(i=; i<pFormatCtx->nb_streams; i++) {
     if(pFormatCtx->streams[i]->codec->codec_type==CODEC_TYPE_VIDEO &&
        video_index < ) {
       video_index=i;
     }
     if(pFormatCtx->streams[i]->codec->codec_type==CODEC_TYPE_AUDIO &&
        audio_index < ) {
       audio_index=i;
     }
   }
   if(audio_index >= ) {
     stream_component_open(is, audio_index);
   }
   if(video_index >= ) {
     stream_component_open(is, video_index);
   }

   if(is->videoStream <  || is->audioStream < ) {
     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();
       continue;
     }
     if(av_read_frame(is->pFormatCtx, packet) < ) {
       if(url_ferror(&pFormatCtx->pb) == ) {
     SDL_Delay(); /* no error; wait for user input */
     continue;
       } else {
     break;
       }
     }
     // 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();
   }

  fail:
   {
     SDL_Event event;
     event.type = FF_QUIT_EVENT;
     event.user.data1 = is;
     SDL_PushEvent(&event);
   }
   return ;
 }

 int main_sync(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();
   }

   // Make a screen to put our video
 #ifndef __DARWIN__
         screen = SDL_SetVideoMode(W, H, , );
 #else
         screen = SDL_SetVideoMode(, , , );
 #endif
   if(!screen) {
     fprintf(stderr, "SDL: could not set video mode - exiting\n");
     exit();
   }

   strncpy(is->filename, "test.mp4", sizeof(is->filename));

   is->pictq_mutex = SDL_CreateMutex();
   is->pictq_cond = SDL_CreateCond();

   schedule_refresh(is, );

   is->parse_tid = SDL_CreateThread(decode_thread, is);
   if(!is->parse_tid) {
     av_free(is);
     return -;
   }
   for(;;) {

     SDL_WaitEvent(&event);
     switch(event.type) {
     case FF_QUIT_EVENT:
     case SDL_QUIT:
       is->quit = ;
       SDL_Quit();
       exit();
       break;
     case FF_ALLOC_EVENT:
       alloc_picture(event.user.data1);
       break;
     case FF_REFRESH_EVENT:
       video_refresh_timer(event.user.data1);
       break;
     default:
       break;
     }
   }
   return ;

 }