播放逻辑

//视频
  while(av_read_frame(pFormatCtx, &packet)>=0) {
        // Is this a packet from the video stream?
        if(packet.stream_index==videoStream) {
            // Decode video frame
            avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished,
                                  &packet);
            
            // Did we get a video frame?
            if(frameFinished) {
            //播放
            }    
       }
}

　//音视频

　

    /* read frames from the file */
    while (av_read_frame(fmt_ctx, &pkt) >= 0) {
        AVPacket orig_pkt = pkt;
        do {
            ret = decode_packet(&got_frame, 0);
            if (ret < 0)
                break;
            pkt.data += ret;
            pkt.size -= ret;
        } while (pkt.size > 0);
        av_packet_unref(&orig_pkt);
    }

　　   /* 判断剩下的一点儿播完没有 got_frame的用处 */
　　　pkt.data = NULL;
　　　pkt.size = 0;
　　　 do {
　　　　　　decode_packet(&got_frame, 1);
　　　} while (got_frame);

　　

static int decode_packet(int *got_frame, int cached)
{
    int ret = 0;
    int decoded = pkt.size;

    *got_frame = 0;

    if (pkt.stream_index == video_stream_idx) {
        /* decode video frame */
        ret = avcodec_decode_video2(video_dec_ctx, frame, got_frame, &pkt);
        if (ret < 0) {
            fprintf(stderr, "Error decoding video frame (%s)\n", av_err2str(ret));
            return ret;
        }

        if (*got_frame) {
　　　　　　//播放
        }
    } else if (pkt.stream_index == audio_stream_idx) {
        /* decode audio frame */
        ret = avcodec_decode_audio4(audio_dec_ctx, frame, got_frame, &pkt);
        if (ret < 0) {
            fprintf(stderr, "Error decoding audio frame (%s)\n", av_err2str(ret));
            return ret;
        }
 
        decoded = FFMIN(ret, pkt.size);

        if (*got_frame) {
　　　　　　　　//播放
        }
    }

    /* If we use frame reference counting, we own the data and need
     * to de-reference it when we don't use it anymore */
    if (*got_frame && refcount)
        av_frame_unref(frame);

    return decoded;
}

 

转载于:https://www.cnblogs.com/cnchengv/p/9841743.html