ffplay流程分析

void main()

{

     is = stream_open(input_filename, file_iformat);

}

static VideoState *stream_open(const char *filename, AVInputFormat *iformat)

{

    is->read_tid     = SDL_CreateThread(read_thread, "read_thread", is);

}

static int read_thread(void *arg)

{

     /* open the streams */

    if (st_index[AVMEDIA_TYPE_AUDIO] >= ) {

        stream_component_open(is, st_index[AVMEDIA_TYPE_AUDIO]);

    }

    ret = -;

    if (st_index[AVMEDIA_TYPE_VIDEO] >= ) {

        ret = stream_component_open(is, st_index[AVMEDIA_TYPE_VIDEO]);

    }

    if (is->show_mode == SHOW_MODE_NONE)

        is->show_mode = ret >=  ? SHOW_MODE_VIDEO : SHOW_MODE_RDFT;

    if (st_index[AVMEDIA_TYPE_SUBTITLE] >= ) {

        stream_component_open(is, st_index[AVMEDIA_TYPE_SUBTITLE]);

    }

}

static int stream_component_open(VideoState *is, int stream_index)

{

    //audio

     decoder_init(&is->auddec, avctx, &is->audioq, is->continue_read_thread);

        if ((is->ic->iformat->flags & (AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK)) && !is->ic->iformat->read_seek) {

            is->auddec.start_pts = is->audio_st->start_time;

            is->auddec.start_pts_tb = is->audio_st->time_base;

        }

        if ((ret = decoder_start(&is->auddec, audio_thread, is)) < )

    //video

     decoder_init(&is->viddec, avctx, &is->videoq, is->continue_read_thread);

        if ((ret = decoder_start(&is->viddec, video_thread, is)) < )

   //subtitle

   decoder_init(&is->subdec, avctx, &is->subtitleq, is->continue_read_thread);

        if ((ret = decoder_start(&is->subdec, subtitle_thread, is)) < )

}