Function hca_read_header

libavformat/hca.c:51–120

}

static int hca_read_header(AVFormatContext *s)
{
    HCADemuxContext *hca = s->priv_data;
    AVCodecParameters *par;
    GetByteContext gb;
    AVIOContext *pb = s->pb;
    AVStream *st;
    uint32_t chunk;
    uint16_t version;
    uint32_t block_count;
    uint16_t block_size, data_offset;
    int ret;

    avio_skip(pb, 4);
    version = avio_rb16(pb);

    data_offset = avio_rb16(pb);
    if (data_offset <= 8)
        return AVERROR_INVALIDDATA;

    st = avformat_new_stream(s, NULL);
    if (!st)
        return AVERROR(ENOMEM);

    par = st->codecpar;
    ret = ff_alloc_extradata(par, data_offset + 10);
    if (ret < 0)
        return ret;

    ret = ffio_read_size(pb, par->extradata + 8, par->extradata_size - 8 - 10);
    if (ret < 0)
        return AVERROR_INVALIDDATA;
    AV_WL32(par->extradata, MKTAG('H', 'C', 'A', 0));
    AV_WB16(par->extradata + 4, version);
    AV_WB16(par->extradata + 6, data_offset);
    AV_WB32(par->extradata + par->extradata_size - 10, hca->keyh);
    AV_WB32(par->extradata + par->extradata_size -  6, hca->keyl);
    AV_WB16(par->extradata + par->extradata_size -  2, hca->subkey);

    bytestream2_init(&gb, par->extradata + 8, par->extradata_size - 8);

    if ((bytestream2_get_le32(&gb) & HCA_MASK) != MKTAG('f', 'm', 't', 0))
        return AVERROR_INVALIDDATA;

    par->codec_type  = AVMEDIA_TYPE_AUDIO;
    par->codec_id    = AV_CODEC_ID_HCA;
    par->codec_tag   = 0;
    st->codecpar->ch_layout.nb_channels = bytestream2_get_byte(&gb);
    par->sample_rate = bytestream2_get_be24(&gb);
    block_count      = bytestream2_get_be32(&gb);
    bytestream2_skip(&gb, 4);
    chunk = bytestream2_get_le32(&gb) & HCA_MASK;
    if (chunk == MKTAG('c', 'o', 'm', 'p')) {
        block_size = bytestream2_get_be16(&gb);
    } else if (chunk == MKTAG('d', 'e', 'c', 0)) {
        block_size = bytestream2_get_be16(&gb);
    } else {
        return AVERROR_INVALIDDATA;