PeerStreamer

            av_log(s, AV_LOG_ERROR, "invalid AAC magic cookie\n");

            return AVERROR_INVALIDDATA;

        }

    } else if (st->codec->codec_id == CODEC_ID_ALAC) {

#define ALAC_PREAMBLE 12

#define ALAC_HEADER   36

        if (size < ALAC_PREAMBLE + ALAC_HEADER) {

            av_log(s, AV_LOG_ERROR, "invalid ALAC magic cookie\n");

            return AVERROR_INVALIDDATA;

        }

        st->codec->extradata = av_mallocz(ALAC_HEADER + FF_INPUT_BUFFER_PADDING_SIZE);

        if (!st->codec->extradata)

            return AVERROR(ENOMEM);

        avio_read(pb, st->codec->extradata, ALAC_HEADER);

        st->codec->extradata_size = ALAC_HEADER;

    } else {

        st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);

        if (!st->codec->extradata)

    int found_data, ret;

    int64_t size;

    /* audio description chunk */

    if (avio_rb32(pb) != MKBETAG('d','e','s','c')) {

        switch (tag) {

        case MKBETAG('d','a','t','a'):

            caf->data_start = avio_tell(pb);

            caf->data_size  = size < 0 ? -1 : size - 4;

            if (caf->data_size > 0 && !url_is_streamed(pb))

            found_data = 1;

            break;

        case MKBETAG('f','r','e','e'):

            if (size < 0)

                return AVERROR_INVALIDDATA;

            break;

        }

    }