{"id":467,"date":"2022-01-31T18:59:32","date_gmt":"2022-01-31T10:59:32","guid":{"rendered":"http:\/\/192.168.0.122:8088\/?p=467"},"modified":"2022-06-11T03:07:22","modified_gmt":"2022-06-10T19:07:22","slug":"ffplay%e6%ba%90%e7%a0%81%e5%88%86%e6%9e%90-stream_component_open","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=467","title":{"rendered":"FFplay\u6e90\u7801\u5206\u6790-stream_component_open"},"content":{"rendered":"\n

\u672c\u7cfb\u5217 \u4ee5 ffmpeg4.2 \u6e90\u7801\u4e3a\u51c6\uff0c\u4e0b\u8f7d\u5730\u5740\uff1a\u94fe\u63a5\uff1a\u767e\u5ea6\u7f51\u76d8<\/a> \u63d0\u53d6\u7801\uff1ag3k8<\/p>\n\n\n\n

FFplay \u6e90\u7801\u5206\u6790\u7cfb\u5217\u4ee5\u4e00\u6761\u7b80\u5355\u7684\u547d\u4ee4\u5f00\u59cb\uff0cffplay -i a.mp4<\/code>\u3002a.mp4\u4e0b\u8f7d\u94fe\u63a5\uff1a\u767e\u5ea6\u7f51\u76d8<\/a>\uff0c\u63d0\u53d6\u7801\uff1anl0s \u3002<\/p>\n\n\n\n

\n\n\n\n

\u4e0a\u4e00\u7bc7\u6587\u7ae0\u5df2\u7ecf\u8bb2\u89e3\u5b8c\u4e86 stream_component_open() \u7684\u903b\u8f91\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u8bb2\u89e3 audio_thread()\uff0c\u97f3\u9891\u89e3\u7801\u7ebf\u7a0b\u7684\u5185\u90e8\u903b\u8f91\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u56e0\u4e3a\u89e3\u7801\u7ebf\u7a0b\u91cc\u9762\u6d89\u53ca\u5230\u4e86 struct Decoder\uff0cPacketQueue\uff0cFrameQueue\u7684\u64cd\u4f5c\uff0c\u6240\u4ee5\u5fc5\u987b\u5148\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e0b\u8fd9\u4e9b\u6570\u636e\u7ed3\u6784\u7684\u5173\u7cfb\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

struct Decoder<\/strong><\/p>\n\n\n\n

  • AVPacket pkt; \u7f13\u5b58\u5305\uff0c\u5728 avcodec_send_packet() \u8fd4\u56de AVERROR(EAGAIN) \u7684\u65f6\u5019\u7528\u7684\uff0c\u56e0\u4e3aAVPacket\u5df2\u7ecf\u4ece\u961f\u5217\u91cc\u9762\u62ff\u51fa\u6765\u4e86\uff0c\u5982\u679csend\u7ed9\u89e3\u7801\u5668\u7684\u65f6\u5019\u5931\u8d25\u4e86\uff0c\u5c31\u9700\u8981\u628a\u62ff\u51fa\u6765\u7684AVPacket\u653e\u5230 Decoder::pkt \u91cc\u9762\uff0c\u8981\u4e0dAVPacket\u5c31\u4f1a\u4e22\u5931\uff0c\u540c\u65f6 packet_pending \u7f6e\u4e3a 1\uff0c\u4e0b\u6b21\u4f18\u5148\u53d6Decoder::pkt \u6765 send\u7ed9\u89e3\u7801\u5668\u3002\u8bf7\u770b\u4ee3\u7801\u3002<\/li><\/ul>\n\n\n\n
    ffplay.c 668 ~ 672\u884c\nif (avcodec_send_packet(d->avctx, &pkt) == AVERROR(EAGAIN)) {\n\tav_log(d->avctx, AV_LOG_ERROR, "Receive_frame and send_packet both returned EAGAIN, which is an API violation.\\n");\n\td->packet_pending = 1; \/\/\u6ce8\u610f\u8fd9\u884c\u4ee3\u7801\u3002\n\tav_packet_move_ref(&d->pkt, &pkt); \/\/\u6ce8\u610f\u8fd9\u884c\u4ee3\u7801\u3002\n}\nffplay.c 637 ~ 647\u884c\ndo {\n    if (d->queue->nb_packets == 0)\n       SDL_CondSignal(d->empty_queue_cond);\n    if (d->packet_pending) { \/\/\u6ce8\u610f\u8fd9\u884c\u4ee3\u7801\u3002\n       av_packet_move_ref(&pkt, &d->pkt);\n       d->packet_pending = 0;\n    } else {\n       if (packet_queue_get(d->queue, &pkt, 1, &d->pkt_serial) < 0)\n          return -1;\n    }\n} while (d->queue->serial != d->pkt_serial);<\/code><\/pre>\n\n\n\n
    • PacketQueue *queue; \u961f\u5217\u3002<\/li>
    • AVCodecContext *avctx; \u89e3\u7801\u5668\u4e0a\u4e0b\u6587<\/li>
    • int pkt_serial; \u89e3\u7801\u5668\u5305\u5e8f\u5217\uff0c\u8fd9\u4e2a\u53d8\u91cf\u662f\u6bcf\u6b21\u4ece\u961f\u5217\u91cc\u9762\u53d6\u51fa\u4e00\u4e2a MyAVPacketList\uff0c\u90fd\u4f1a\u628a pkt_serial \u8bbe\u7f6e\u4e3a MyAVPacketList::serial\uff0c\u53ef\u4ee5\u7406\u89e3\u4e3a\uff0c\u8fd9\u4e2a\u53d8\u91cf\u662f\u6700\u540e\u4e00\u4e2a\u53d1\u9001\u7ed9\u89e3\u7801\u5668\u7684 packet \u7684\u5e8f\u5217\u53f7\u3002<\/li>
    • int finished; \u89e3\u7801\u5668\u662f\u5426\u5df2\u7ecf\u6ca1\u6709 AVFrame\u53ef\u4ee5\u8f93\u51fa\u3002\u5728 avcodec_receive_frame() \u8fd4\u56de AVERROR_EOF \u7684\u65f6\u5019\uff0cfinished \u4f1a\u8bbe\u7f6e\u4e3a pkt_serial\uff0c\u5c31\u662f\u8bbe\u7f6e\u4e3a\u6700\u540e\u4e00\u4e2apacket\u7684\u5e8f\u5217\u53f7\u3002<\/li>
    • int packet_pending; \u5728 avcodec_send_packet() \u8fd4\u56de AVERROR(EAGAIN) \u7684\u65f6\u5019\u7528\u7684<\/li>
    • SDL_cond *empty_queue_cond; empty_queue_cond \u6761\u4ef6\u53d8\u91cf\u5176\u5b9e\u7b49\u4e8e continue_read_thread\uff0c\u8bf7\u770b\u4e0b\u9762\u4ee3\u7801\u3002\u4e0a\u4e00\u7bc7\u6587\u7ae0\u5206\u6790 read_thread() \u7684\u65f6\u5019\uff0cread_thread() \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u4f1a\u4f11\u772010ms\uff0c\u4f8b\u5982\u961f\u5217\u6ee1\u4e86\u6216\u8d85\u8fc7\u6700\u5c0f\u7f13\u5b58size\uff0c\u4f1a\u4f11\u772010ms\uff0c\u5982\u679c\u57285ms\u7684\u65f6\u5019\uff0c\u961f\u5217\u5df2\u7ecf\u88ab\u6d88\u8017\u5b8c\u4e86\uff0c\u6ca1\u6709frame\u53ef\u4ee5\u64ad\u653e\u4e86\uff0c\u90a3\u5c31\u9700\u8981\u5c3d\u5feb\u5524\u9192read_thread() \u7ebf\u7a0b\uff0c\u8fd9\u4e2a empty_queue_cond \u6761\u4ef6\u53d8\u91cf\u5c31\u662f\u7528\u6765\u5524\u9192 read_thread \u7ebf\u7a0b\u7684\u3002<\/li><\/ul>\n\n\n\n
      \/\/read_thread \u4f11\u7720 10ms\nSDL_CondWaitTimeout(is->continue_read_thread, wait_mutex, 10);\n\/\/\u6ce8\u610f\u6700\u540e\u4e00\u4e2a\u53c2\u6570,continue_read_thread \u8d4b\u503c\u7ed9 empty_queue_cond \ndecoder_init(&is->auddec, avctx, &is->audioq, is->continue_read_thread);\ndecoder_init(&is->viddec, avctx, &is->videoq, is->continue_read_thread);<\/code><\/pre>\n\n\n\n
      • int64_t start_pts; \u8fd9\u4e2a\u5b57\u6bb5\u53ea\u7528\u4e8e\u97f3\u9891\u6d41\uff0c\u5728\u672c\u6587\u547d\u4ee4\u91cc\u9762\uff0c\u8fd9\u4e2a\u5b57\u6bb5\u7684\u503c\u4e00\u76f4\u662f AV_NOPTS_VALUE\uff0c\u4e0d\u6e05\u695a\u5728\u97f3\u9891\u6d41\u4ec0\u4e48\u573a\u666f\u4e0b\u4f7f\u7528\u3002<\/li>
      • AVRational start_pts_tb; \u65f6\u95f4\u57fa\u3002<\/li>
      • int64_t next_pts; \u8fd9\u4e2a\u5b57\u6bb5\u4e5f\u662f\u53ea\u7528\u4e8e\u97f3\u9891\u6d41\u4e86\u3002\u4ece avcodec_receive_frame() \u89e3\u7801\u5668\u53d6\u5230\u7684AVFrame \u7684pts\u5982\u679c\u6709\u95ee\u9898\uff0c\u5c31\u4f1a\u7528next_pts\u4ee3\u66ff\u3002next_pts\u7684\u8ba1\u7b97\u65b9\u5f0f\u662f\u4e0a\u4e00\u5e27\u7684pts + \u4e0a\u4e00\u5e27\u7684\u6837\u672c\u6570\u3002\u5982\u4e0b\u4ee3\u7801\u6240\u793a\uff1a<\/li><\/ul>\n\n\n\n
        ret = avcodec_receive_frame(d->avctx, frame);\nif (ret >= 0) {\n\tAVRational tb = (AVRational){1, frame->sample_rate};\n\tif (frame->pts != AV_NOPTS_VALUE)\n\t\tframe->pts = av_rescale_q(frame->pts, d->avctx->pkt_timebase, tb);\n\telse if (d->next_pts != AV_NOPTS_VALUE) \/\/\u6ce8\u610f\u8fd9\u884c\u4ee3\u7801\n\t\tframe->pts = av_rescale_q(d->next_pts, d->next_pts_tb, tb);\n\tif (frame->pts != AV_NOPTS_VALUE) {\n\t\td->next_pts = frame->pts + frame->nb_samples;\n\t\td->next_pts_tb = tb;\n\t}\n}<\/code><\/pre>\n\n\n\n
        • AVRational next_pts_tb; \u65f6\u95f4\u57fa<\/li>
        • SDL_Thread *decoder_tid; \u89e3\u7801\u7ebf\u7a0b id\u3002<\/li><\/ul>\n\n\n\n
          struct PacketQueue<\/strong><\/p>\n\n\n\n
          • MyAVPacketList *first_pkt, *last_pkt; \u961f\u5217\u7684\u5934\u5c3e<\/li>
          • int nb_packets; \u961f\u5217\u7684\u5305\u6570\u91cf<\/li>
          • int size; \u961f\u5217\u7f13\u5b58\u7684\u6570\u636esize<\/li>
          • int64_t duration; \u961f\u5217\u7f13\u5b58\u7684duration\uff0c\u901a\u8fc7AVPacket->duration \u7d2f\u52a0\u5f97\u5230\u3002<\/li>
          • int abort_request; \u505c\u6b62\u89e3\u7801\u7ebf\u7a0b\uff0c\u89e3\u7801\u7ebf\u7a0b\u4ee3\u7801\u6709\u597d\u51e0\u4e2a\u5730\u65b9\u5224\u65ad abort_request \u662f\u5426\u4e3a1\uff0c stream_component_close() \u91cc\u9762\u4f1a\u628a\u8fd9\u4e2a\u5b57\u6bb5\u7f6e\u4e3a1\u3002<\/li>
          • int serial; \u961f\u5217\u7684\u5e8f\u5217\u53f7\uff0c\u961f\u5217\u7684serial\u8ddf MyAVPacketList \u7684serial \u53ef\u4ee5\u4e0d\u4e00\u6837\u7684\u3002\u8ddf\u961f\u5217serial\u4e0d\u4e00\u6837\u7684 MyAVPacketList \u5c31\u662f\u65e7\u7684\uff0c\u89e3\u7801\u7684\u65f6\u5019\u4f1a\u4e22\u5f03\u65e7\u7684MyAVPacketList\u3002<\/li>
          • SDL_mutex *mutex; \u4e92\u65a5\u9501\uff0c\u4e3b\u8981\u7528\u4e8e\u4fee\u6539\u961f\u5217\u7684\u65f6\u5019\u52a0\u9501\u3002<\/li>
          • SDL_cond *cond; \u6761\u4ef6\u53d8\u91cf\uff0c\u7528\u4e8e\u89e3\u7801\u7ebf\u7a0b\u8ddf read_thread \u7ebf\u7a0b\u901a\u4fe1\u3002\u5f53\u89e3\u7801\u7ebf\u7a0b\u6ca1\u6709packet\u53ef\u4ee5\u8bfb\u7684\u65f6\u5019\uff0c\u5c31\u4f1a wait cond \u963b\u585e\uff0c\u7b49\u5f85\uff0c\u7136\u540e read_thread \u8bfb\u53d6\u5230packet\u4e22\u8fdb\u53bb\u961f\u5217\u4e4b\u540e\uff0c\u5c31\u4f1asignal cond \u5524\u9192\u89e3\u7801\u7ebf\u7a0b\u7ee7\u7eed\u89e3\u7801\u3002<\/li><\/ul>\n\n\n\n
            \n\n\n\n
            google_ads_content<\/p>\n\n\n\n
            \n\n\n\n
            \u9884\u5907\u5de5\u4f5c\uff0c\u6570\u636e\u7ed3\u6784\u5df2\u7ecf\u8bb2\u5b8c\u4e86\uff0c\u4e0b\u9762\u6b63\u5f0f\u5f00\u59cb\u8bb2\u89e3 audio_thread() \u89e3\u7801\u7ebf\u7a0b\u91cc\u9762\u7684\u903b\u8f91\u3002<\/p>\n\n\n\n
            static int audio_thread(void *arg)\n{\n    VideoState *is = arg;\n    AVFrame *frame = av_frame_alloc();\n    ...\u7701\u7565\u4ee3\u7801..\n    do {\n        if ((got_frame = decoder_decode_frame(&is->auddec, frame, NULL)) < 0)\n            goto the_end;\n        ...\u7701\u7565\u4ee3\u7801...\n    } while (ret >= 0 || ret == AVERROR(EAGAIN) || ret == AVERROR_EOF);\n}<\/code><\/pre>\n\n\n\n
            \u4ece\u4e0a\u9762\u7684\u4ee3\u7801\u53ef\u4ee5\u770b\u5230 audio_thread() \u4e00\u5f00\u59cb\u5c31\u8fdb\u5165\u4e00\u4e2a do() while{} \u7684\u5faa\u73af\u3002\u5728\u8fd9\u4e2a\u5faa\u73af\u91cc\u9762\u4f1a\u4e0d\u65ad\u7684\u62ff PacketQueue \u7684\u6570\u636e\uff0c\u4f20\u7ed9\u89e3\u7801\u5668\uff0c\u89e3\u51fa AVFrame\uff0c\u7136\u540e\u628a AVFrame \u8fc7\u4e00\u904dfilter\uff0c\u672c\u6587\u547d\u4ee4filter\u662f\u7a7a\uff0c\u7136\u540e\u518d\u628a frame \u63d2\u5165 FrameQueue \u961f\u5217\uff0c\u8ba9\u64ad\u653e\u7ebf\u7a0b\u53d6\u62ffframe\u64ad\u653e\u3002<\/p>\n\n\n\n
            \u91cc\u9762\u6bd4\u8f83\u91cd\u8981\u7684\u4e00\u4e2a\u51fd\u6570\u662f decoder_decode_frame()<\/strong>\uff0c\u8fd9\u662f\u4e00\u4e2a\u963b\u585e\u51fd\u6570\uff0c\u5b83\u5185\u90e8\u4f1a\u4e0d\u65ad\u5faa\u73af\u7b49\u5f85\uff0c\u76f4\u5230\u8bfb\u51fa\u4e00\u4e2aAVFrame\u3002<\/p>\n\n\n\n
            \u91cd\u70b9\u77e5\u8bc6\uff1a<\/strong><\/p>\n\n\n\n
            decoder_decode_frame()\u8fd4\u56de\u7684 got_frame \u7684\u6709\u51e0\u4e2a\u503c\uff1f\u3002<\/p>\n\n\n\n
            • \u8fd4\u56de 1\uff0c\u83b7\u53d6\u5230 AVFrame\u4e86\u3002<\/li>
            • \u8fd4\u56de 0 \uff0c\u6587\u4ef6\u5df2\u7ecf\u8bfb\u53d6\u5b8c\u6bd5\uff0c\u5e76\u4e14\u4e5f\u89e3\u7801\u5b8c\u6bd5\uff0c\u6ca1\u6709AVFrame\u8fd4\u56de\u3002<\/li>
            • \u8fd4\u56de -1\uff0c\u6d41\u5173\u95ed\u4e86\uff0cabort_request \u53d8\u6210\u4e86 1\u4e86\uff0cgot_frame \u5c31\u4f1a\u662f -1\u3002<\/li><\/ul>\n\n\n\n
              \n\n\n\n
              \u4e0b\u9762\u5206\u6790\u83b7\u53d6\u5230 AVFrame \u4e4b\u540e\u7684\u903b\u8f91\u3002<\/p>\n\n\n\n
              \u83b7\u53d6\u5230 AVFrame \u4e4b\u540e\uff0cffplay \u4f1a\u5bf9 AVFrame\u7684\u91c7\u6837\u7387\uff0c\u683c\u5f0f\u505a\u4e00\u6b21\u6821\u9a8c\uff0c\u8fd9\u91cc\u53c8\u6709\u4e00\u6b21\u6821\u9a8c\uff0cffplay\u771f\u662f\u4e25\u8c28\u3002\u4e3b\u8981\u6821\u9a8c\u4ec0\u4e48\u5462\uff1f\u6821\u9a8cstream\u5bb9\u5668\u5c42\u7684\u91c7\u6837\u7387\uff0c\u683c\u5f0f\uff0c\u662f\u4e0d\u662f\u8ddf AVFrame \u7684\u6570\u636e\u662f\u4e00\u81f4\u7684\uff1f\u5e94\u8be5\u662fffpaly\u62c5\u5fc3\uff0c\u6709\u4e9b\u97f3\u9891\u6d41\uff0c\u867d\u7136\u5bb9\u5668\u5c42\u7684\u91c7\u6837\u7387\u5b57\u6bb5\u662f48000\uff0c\u4f46\u5b9e\u9645\u89e3\u7801\u51fa\u6765\u7684AVFrame \u5374\u662f 44100\u3002\u6821\u9a8c\u5982\u679c\u4e0d\u4e00\u81f4\uff0c\u5c31\u4f1a \u8c03 configure_audio_filters() \u91cd\u65b0\u521d\u59cbfilter\u3002<\/p>\n\n\n\n
              \u6821\u9a8c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
              reconfigure =\n             cmp_audio_fmts(is->audio_filter_src.fmt, is->audio_filter_src.channels,frame->format, frame->channels) ||\n             is->audio_filter_src.channel_layout != dec_channel_layout ||\n             is->audio_filter_src.freq           != frame->sample_rate ||\n             is->auddec.pkt_serial               != last_serial;<\/code><\/pre>\n\n\n\n
              is->audio_filter_src \u7684\u503c\u662f\u4ece\u89e3\u7801\u5668 avctx \u91cc\u9762\u6765\u7684\uff0c\u8bf7\u770b\u4e0b\u56fe\u3002<\/p>\n\n\n\n
              ffpaly.c 2639 \u884c\nis->audio_filter_src.freq           = avctx->sample_rate;\nis->audio_filter_src.channels       = avctx->channels;\nis->audio_filter_src.channel_layout = get_valid_channel_layout(avctx->channel_layout, avctx->channels);\nis->audio_filter_src.fmt            = avctx->sample_fmt;<\/code><\/pre>\n\n\n\n
              \u89e3\u7801\u5668 avctx \u7684\u91c7\u6837\u7387\u53c8\u662f\u4ece\u5bb9\u5668\u5c42\u6765\u7684\uff0c\u8bf7\u770b\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n\n\n\n
              ffpaly.c 2581 \u884c\nret = avcodec_parameters_to_context(avctx, ic->streams[stream_index]->codecpar);<\/code><\/pre>\n\n\n\n
              \u6821\u9a8c\u5b8c\u91c7\u6837\u7387\u4e4b\u540e\uff0c\u5c31\u662f\u8c03 av_buffersrc_add_frame() \u628a AVFrame \u5f80 filter \u91cc\u9762\u9001\u4e86\uff0c\u7136\u540e \u5faa\u73af \u8c03 av_buffersink_get_frame_flags()\uff0c\u4e0d\u65ad\u6536\u5272\u7ecf\u8fc7filter\u7684AVFrame\u3002\u7136\u540e\u8c03 frame_queue_push() \u63d2\u5165 FrameQueue \u961f\u5217\uff0c\u8ba9\u64ad\u653e\u7ebf\u7a0b\u53d6\u3002<\/p>\n\n\n\n
              \n\n\n\n
              ffplay \u6e90\u7801\u5206\u6790\uff0caudio_thread() \u89e3\u7801\u7ebf\u7a0b\u5206\u6790\u5b8c\u6bd5\u3002<\/p>\n\n\n\n
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