Function wav_read_header

libavformat/wavdec.c:354–690

wav input */

/* wav input */
static int wav_read_header(AVFormatContext *s)
{
    int64_t size, av_uninit(data_size);
    int64_t sample_count = 0;
    int rf64 = 0, bw64 = 0;
    uint32_t tag;
    AVIOContext *pb      = s->pb;
    AVStream *st         = NULL;
    WAVDemuxContext *wav = s->priv_data;
    int ret, got_fmt = 0, got_xma2 = 0;
    int64_t next_tag_ofs, data_ofs = -1;

    wav->unaligned = avio_tell(s->pb) & 1;

    wav->smv_data_ofs = -1;

    /* read chunk ID */
    tag = avio_rl32(pb);
    switch (tag) {
    case MKTAG('R', 'I', 'F', 'F'):
        break;
    case MKTAG('R', 'I', 'F', 'X'):
        wav->rifx = 1;
        break;
    case MKTAG('R', 'F', '6', '4'):
        rf64 = 1;
        break;
    case MKTAG('B', 'W', '6', '4'):
        bw64 = 1;
        break;
    default:
        av_log(s, AV_LOG_ERROR, "invalid start code %s in RIFF header\n",
               av_fourcc2str(tag));
        return AVERROR_INVALIDDATA;
    }

    /* read chunk size */
    avio_rl32(pb);

    /* read format */
    if (avio_rl32(pb) != MKTAG('W', 'A', 'V', 'E')) {
        av_log(s, AV_LOG_ERROR, "invalid format in RIFF header\n");
        return AVERROR_INVALIDDATA;
    }

    if (rf64 || bw64) {
        if (avio_rl32(pb) != MKTAG('d', 's', '6', '4'))
            return AVERROR_INVALIDDATA;
        size = avio_rl32(pb);
        if (size < 24)
            return AVERROR_INVALIDDATA;
        avio_rl64(pb); /* RIFF size */

        data_size    = avio_rl64(pb);
        sample_count = avio_rl64(pb);

        if (data_size < 0 || sample_count < 0) {
            av_log(s, AV_LOG_ERROR, "negative data_size and/or sample_count in "