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 ((ret = init_get_bits8(&gb, hdr, ret)) < 0) return ret; if (avpriv_dca_parse_core_frame_header(&gb, &h) < 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; }
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 ((ret = init_get_bits8(&gb, hdr, ret)) < 0) return ret; if (avpriv_dca_parse_core_frame_header(&gb, &h) < 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; }