ffplay源码__音频解码线程audio_thread

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已于 2025-05-01 19:56:40 修改 · 768 阅读

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#音视频 #ffmpeg

于 2025-04-12 19:08:59 首次发布

前言

audio_thread线程主要负责解码音频数据。本文是把CONFIG_AVFILTER设置为0去掉滤镜功能后分析的。

一、audio_thread线程

去掉滤镜后的代码如下：

static int audio_thread(void *arg)
{
    VideoState *is = arg;
    AVFrame *frame = av_frame_alloc();
    Frame *af;
    int got_frame = 0;
    AVRational tb;
    int ret = 0;

    if (!frame)
        return AVERROR(ENOMEM);

    do {
        if ((got_frame = decoder_decode_frame(&is->auddec, frame, NULL)) < 0)
            goto the_end;

        if (got_frame) {
                tb = (AVRational){1, frame->sample_rate};
             
                if (!(af = frame_queue_peek_writable(&is->sampq)))
                    goto the_end;

                af->pts = (frame->pts == AV_NOPTS_VALUE) ? NAN : frame->pts * av_q2d(tb);
                af->pos = frame->pkt_pos;
                af->serial = is->auddec.pkt_serial;
                af->duration = av_q2d((AVRational){frame->nb_samples,