static int dca_parse_params(DCAParseContext *pc1, const uint8_t *buf,
                            int buf_size, int *duration, int *sample_rate,
                            int *profile)
{
    DCAExssAsset *asset = &pc1->exss.assets[0];
    GetBitContext gb;
    DCACoreFrameHeader h;
    uint8_t hdr[DCA_CORE_FRAME_HEADER_SIZE + AV_INPUT_BUFFER_PADDING_SIZE] = { 0 };
    int ret, frame_size;

    if (buf_size < DCA_CORE_FRAME_HEADER_SIZE)
        return AVERROR_INVALIDDATA;

    if (AV_RB32(buf) == DCA_SYNCWORD_SUBSTREAM) {
        if ((ret = ff_dca_exss_parse(&pc1->exss, buf, buf_size)) < 0)
            return ret;

        if (asset->extension_mask & DCA_EXSS_LBR) {
            if ((ret = init_get_bits8(&gb, buf + asset->lbr_offset, asset->lbr_size)) < 0)
                return ret;

            if (get_bits_long(&gb, 32) != DCA_SYNCWORD_LBR)
                return AVERROR_INVALIDDATA;

            switch (get_bits(&gb, 8)) {
            case DCA_LBR_HEADER_DECODER_INIT:
                pc1->sr_code = get_bits(&gb, 8);
            case DCA_LBR_HEADER_SYNC_ONLY:
                break;
            default:
                return AVERROR_INVALIDDATA;
            }

            if (pc1->sr_code >= FF_ARRAY_ELEMS(ff_dca_sampling_freqs))
                return AVERROR_INVALIDDATA;

            *sample_rate = ff_dca_sampling_freqs[pc1->sr_code];
            *duration = 1024 << ff_dca_freq_ranges[pc1->sr_code];
            *profile = FF_PROFILE_DTS_EXPRESS;
            return 0;
        }

        if (asset->extension_mask & DCA_EXSS_XLL) {
            int nsamples_log2;

            if ((ret = init_get_bits8(&gb, buf + asset->xll_offset, asset->xll_size)) < 0)
                return ret;

            if (get_bits_long(&gb, 32) != DCA_SYNCWORD_XLL)
                return AVERROR_INVALIDDATA;

            if (get_bits(&gb, 4))
                return AVERROR_INVALIDDATA;

            skip_bits(&gb, 8);
            skip_bits_long(&gb, get_bits(&gb, 5) + 1);
            skip_bits(&gb, 4);
            nsamples_log2 = get_bits(&gb, 4) + get_bits(&gb, 4);
            if (nsamples_log2 > 24)
                return AVERROR_INVALIDDATA;

            *sample_rate = asset->max_sample_rate;
            *duration = (1 + (*sample_rate > 96000)) << nsamples_log2;
            *profile = FF_PROFILE_DTS_HD_MA;
            return 0;
        }

        return AVERROR_INVALIDDATA;
    }

    if ((ret = avpriv_dca_convert_bitstream(buf, DCA_CORE_FRAME_HEADER_SIZE,
                                            hdr, DCA_CORE_FRAME_HEADER_SIZE)) < 0)
        return ret;
    if (avpriv_dca_parse_core_frame_header(&h, hdr, ret) < 0)
        return AVERROR_INVALIDDATA;

    *duration = h.npcmblocks * DCA_PCMBLOCK_SAMPLES;
    *sample_rate = avpriv_dca_sample_rates[h.sr_code];
    if (*profile != FF_PROFILE_UNKNOWN)
        return 0;

    *profile = FF_PROFILE_DTS;
    if (h.ext_audio_present) {
        switch (h.ext_audio_type) {
        case DCA_EXT_AUDIO_XCH:
        case DCA_EXT_AUDIO_XXCH:
            *profile = FF_PROFILE_DTS_ES;
            break;
        case DCA_EXT_AUDIO_X96:
            *profile = FF_PROFILE_DTS_96_24;
            break;
        }
    }

    frame_size = FFALIGN(h.frame_size, 4);
    if (buf_size - 4 < frame_size)
        return 0;

    buf      += frame_size;
    buf_size -= frame_size;
    if (AV_RB32(buf) != DCA_SYNCWORD_SUBSTREAM)
        return 0;
    if (ff_dca_exss_parse(&pc1->exss, buf, buf_size) < 0)
        return 0;

    if (asset->extension_mask & DCA_EXSS_XLL)
        *profile = FF_PROFILE_DTS_HD_MA;
    else if (asset->extension_mask & (DCA_EXSS_XBR | DCA_EXSS_XXCH | DCA_EXSS_X96))
        *profile = FF_PROFILE_DTS_HD_HRA;

    return 0;
}