Function ffat_encode

libavcodec/audiotoolboxenc.c:516–586

}

static int ffat_encode(AVCodecContext *avctx, AVPacket *avpkt,
                       const AVFrame *frame, int *got_packet_ptr)
{
    ATDecodeContext *at = avctx->priv_data;
    OSStatus ret;

    AudioBufferList out_buffers = {
        .mNumberBuffers = 1,
        .mBuffers = {
            {
                .mNumberChannels = avctx->ch_layout.nb_channels,
                .mDataByteSize = at->pkt_size,
            }
        }
    };
    AudioStreamPacketDescription out_pkt_desc = {0};

    if (frame) {
        AVFrame *in_frame;

        if (ff_bufqueue_is_full(&at->frame_queue)) {
            /*
             * The frame queue is significantly larger than needed in practice,
             * but no clear way to determine the minimum number of samples to
             * get output from AudioConverterFillComplexBuffer().
             */
            av_log(avctx, AV_LOG_ERROR, "Bug: frame queue is too small.\n");
            return AVERROR_BUG;
        }

        if ((ret = ff_af_queue_add(&at->afq, frame)) < 0)
            return ret;

        in_frame = av_frame_clone(frame);
        if (!in_frame)
            return AVERROR(ENOMEM);

        ff_bufqueue_add(avctx, &at->frame_queue, in_frame);
    } else {
        at->eof = 1;
    }

    if ((ret = ff_alloc_packet(avctx, avpkt, at->pkt_size)) < 0)
        return ret;


    out_buffers.mBuffers[0].mData = avpkt->data;

    *got_packet_ptr = avctx->frame_size / at->frame_size;

    ret = AudioConverterFillComplexBuffer(at->converter, ffat_encode_callback, avctx,
                                          got_packet_ptr, &out_buffers,
                                          (avctx->frame_size > at->frame_size) ? NULL : &out_pkt_desc);

    ff_bufqueue_discard_all(&at->used_frame_queue);

    if ((!ret || ret == 1) && *got_packet_ptr) {
        avpkt->size = out_buffers.mBuffers[0].mDataByteSize;