static uint16_t ps_extension(ps_info *ps, bitfile *ld, const uint8_t ps_extension_id, const uint16_t num_bits_left) { uint8_t n; uint16_t bits = (uint16_t)faad_get_processed_bits(ld); if (ps_extension_id == 0) { ps->enable_ipdopd = (uint8_t)faad_get1bit(ld DEBUGVAR(1,1015,"ps_extension(): enable_ipdopd")); if (ps->enable_ipdopd) { for (n = 0; n < ps->num_env; n++) { ps->ipd_dt[n] = (uint8_t)faad_get1bit(ld DEBUGVAR(1,1016,"ps_extension(): ipd_dt")); /* ipd_data */ huff_data(ld, ps->ipd_dt[n], ps->nr_ipdopd_par, t_huff_ipd, f_huff_ipd, ps->ipd_index[n]); ps->opd_dt[n] = (uint8_t)faad_get1bit(ld DEBUGVAR(1,1017,"ps_extension(): opd_dt")); /* opd_data */ huff_data(ld, ps->opd_dt[n], ps->nr_ipdopd_par, t_huff_opd, f_huff_opd, ps->opd_index[n]); } } faad_get1bit(ld DEBUGVAR(1,1018,"ps_extension(): reserved_ps")); } /* return number of bits read */ bits = (uint16_t)faad_get_processed_bits(ld) - bits; return bits; }
uint16_t ps_data(ps_info *ps, bitfile *ld) { uint8_t tmp, n; uint16_t bits = (uint16_t)faad_get_processed_bits(ld); /* check for new PS header */ if (faad_get1bit(ld DEBUGVAR(1,1000,"ps_data(): enable_ps_header"))) { ps->use34hybrid_bands = 0; /* Inter-channel Intensity Difference (IID) parameters enabled */ ps->enable_iid = (uint8_t)faad_get1bit(ld DEBUGVAR(1,1001,"ps_data(): enable_iid")); if (ps->enable_iid) { ps->iid_mode = (uint8_t)faad_getbits(ld, 3 DEBUGVAR(1,1002,"ps_data(): iid_mode")); ps->nr_iid_par = nr_iid_par_tab[ps->iid_mode]; ps->nr_ipdopd_par = nr_ipdopd_par_tab[ps->iid_mode]; if (ps->iid_mode == 2 || ps->iid_mode == 5) ps->use34hybrid_bands = 1; /* IPD freq res equal to IID freq res */ ps->ipd_mode = ps->iid_mode; } /* Inter-channel Coherence (ICC) parameters enabled */ ps->enable_icc = (uint8_t)faad_get1bit(ld DEBUGVAR(1,1003,"ps_data(): enable_icc")); if (ps->enable_icc) { ps->icc_mode = (uint8_t)faad_getbits(ld, 3 DEBUGVAR(1,1004,"ps_data(): icc_mode")); ps->nr_icc_par = nr_icc_par_tab[ps->icc_mode]; if (ps->icc_mode == 2 || ps->icc_mode == 5) ps->use34hybrid_bands = 1; } /* PS extension layer enabled */ ps->enable_ext = (uint8_t)faad_get1bit(ld DEBUGVAR(1,1005,"ps_data(): enable_ext")); } ps->frame_class = (uint8_t)faad_get1bit(ld DEBUGVAR(1,1006,"ps_data(): frame_class")); tmp = (uint8_t)faad_getbits(ld, 2 DEBUGVAR(1,1007,"ps_data(): num_env_idx")); ps->num_env = num_env_tab[ps->frame_class][tmp]; if (ps->frame_class) { for (n = 1; n < ps->num_env+1; n++) { ps->border_position[n] = (uint8_t)faad_getbits(ld, 5 DEBUGVAR(1,1008,"ps_data(): border_position")); } } if (ps->enable_iid) { for (n = 0; n < ps->num_env; n++) { ps->iid_dt[n] = (uint8_t)faad_get1bit(ld DEBUGVAR(1,1009,"ps_data(): iid_dt")); /* iid_data */ if (ps->iid_mode < 3) { huff_data(ld, ps->iid_dt[n], ps->nr_iid_par, t_huff_iid_def, f_huff_iid_def, ps->iid_index[n]); } else { huff_data(ld, ps->iid_dt[n], ps->nr_iid_par, t_huff_iid_fine, f_huff_iid_fine, ps->iid_index[n]); } } } if (ps->enable_icc) { for (n = 0; n < ps->num_env; n++) { ps->icc_dt[n] = (uint8_t)faad_get1bit(ld DEBUGVAR(1,1010,"ps_data(): icc_dt")); /* icc_data */ huff_data(ld, ps->icc_dt[n], ps->nr_icc_par, t_huff_icc, f_huff_icc, ps->icc_index[n]); } } if (ps->enable_ext) { uint16_t num_bits_left; uint16_t cnt = (uint16_t)faad_getbits(ld, 4 DEBUGVAR(1,1011,"ps_data(): ps_extension_size")); if (cnt == 15) { cnt += (uint16_t)faad_getbits(ld, 8 DEBUGVAR(1,1012,"ps_data(): esc_count")); } num_bits_left = 8 * cnt; while (num_bits_left > 7) { uint8_t ps_extension_id = (uint8_t)faad_getbits(ld, 2 DEBUGVAR(1,1013,"ps_data(): ps_extension_size")); num_bits_left -= 2; num_bits_left -= ps_extension(ps, ld, ps_extension_id, num_bits_left); } faad_getbits(ld, num_bits_left DEBUGVAR(1,1014,"ps_data(): fill_bits")); } bits = (uint16_t)faad_get_processed_bits(ld) - bits; ps->ps_data_available = 1; return bits; }
int8_t AudioSpecificConfig2(uint8_t *pBuffer, uint32_t buffer_size, mp4AudioSpecificConfig *mp4ASC, program_config *pce) { bitfile ld; int8_t result = 0; #ifdef SBR_DEC int8_t bits_to_decode = 0; #endif if (pBuffer == NULL) return -7; if (mp4ASC == NULL) return -8; memset(mp4ASC, 0, sizeof(mp4AudioSpecificConfig)); faad_initbits(&ld, pBuffer, buffer_size); faad_byte_align(&ld); mp4ASC->objectTypeIndex = (uint8_t)faad_getbits(&ld, 5 DEBUGVAR(1,1,"parse_audio_decoder_specific_info(): ObjectTypeIndex")); mp4ASC->samplingFrequencyIndex = (uint8_t)faad_getbits(&ld, 4 DEBUGVAR(1,2,"parse_audio_decoder_specific_info(): SamplingFrequencyIndex")); mp4ASC->channelsConfiguration = (uint8_t)faad_getbits(&ld, 4 DEBUGVAR(1,3,"parse_audio_decoder_specific_info(): ChannelsConfiguration")); mp4ASC->samplingFrequency = get_sample_rate(mp4ASC->samplingFrequencyIndex); if (ObjectTypesTable[mp4ASC->objectTypeIndex] != 1) { faad_endbits(&ld); return -1; } if (mp4ASC->samplingFrequency == 0) { faad_endbits(&ld); return -2; } if (mp4ASC->channelsConfiguration > 7) { faad_endbits(&ld); return -3; } #if (defined(PS_DEC) || defined(DRM_PS)) /* check if we have a mono file */ if (mp4ASC->channelsConfiguration == 1) { /* upMatrix to 2 channels for implicit signalling of PS */ mp4ASC->channelsConfiguration = 2; } #endif #ifdef SBR_DEC mp4ASC->sbr_present_flag = -1; if (mp4ASC->objectTypeIndex == 5) { uint8_t tmp; mp4ASC->sbr_present_flag = 1; tmp = (uint8_t)faad_getbits(&ld, 4 DEBUGVAR(1,5,"parse_audio_decoder_specific_info(): extensionSamplingFrequencyIndex")); /* check for downsampled SBR */ if (tmp == mp4ASC->samplingFrequencyIndex) mp4ASC->downSampledSBR = 1; mp4ASC->samplingFrequencyIndex = tmp; if (mp4ASC->samplingFrequencyIndex == 15) { mp4ASC->samplingFrequency = (uint32_t)faad_getbits(&ld, 24 DEBUGVAR(1,6,"parse_audio_decoder_specific_info(): extensionSamplingFrequencyIndex")); } else { mp4ASC->samplingFrequency = get_sample_rate(mp4ASC->samplingFrequencyIndex); } mp4ASC->objectTypeIndex = (uint8_t)faad_getbits(&ld, 5 DEBUGVAR(1,7,"parse_audio_decoder_specific_info(): ObjectTypeIndex")); } #endif /* get GASpecificConfig */ if (mp4ASC->objectTypeIndex == 1 || mp4ASC->objectTypeIndex == 2 || mp4ASC->objectTypeIndex == 3 || mp4ASC->objectTypeIndex == 4 || mp4ASC->objectTypeIndex == 6 || mp4ASC->objectTypeIndex == 7) { result = GASpecificConfig(&ld, mp4ASC, pce); #ifdef ERROR_RESILIENCE } else if (mp4ASC->objectTypeIndex >= ER_OBJECT_START) { /* ER */ result = GASpecificConfig(&ld, mp4ASC, pce); mp4ASC->epConfig = (uint8_t)faad_getbits(&ld, 2 DEBUGVAR(1,143,"parse_audio_decoder_specific_info(): epConfig")); if (mp4ASC->epConfig != 0) result = -5; #endif } else { result = -4; } #ifdef SSR_DEC /* shorter frames not allowed for SSR */ if ((mp4ASC->objectTypeIndex == 4) && mp4ASC->frameLengthFlag) return -6; #endif #ifdef SBR_DEC bits_to_decode = (int8_t)(buffer_size*8 - faad_get_processed_bits(&ld)); if ((mp4ASC->objectTypeIndex != 5) && (bits_to_decode >= 16)) { int16_t syncExtensionType = (int16_t)faad_getbits(&ld, 11 DEBUGVAR(1,9,"parse_audio_decoder_specific_info(): syncExtensionType")); if (syncExtensionType == 0x2b7) { uint8_t tmp_OTi = (uint8_t)faad_getbits(&ld, 5 DEBUGVAR(1,10,"parse_audio_decoder_specific_info(): extensionAudioObjectType")); if (mp4ASC->objectTypeIndex == 5) { mp4ASC->sbr_present_flag = (uint8_t)faad_get1bit(&ld DEBUGVAR(1,11,"parse_audio_decoder_specific_info(): sbr_present_flag")); if (mp4ASC->sbr_present_flag) { uint8_t tmp; /* Don't set OT to SBR until checked that it is actually there */ mp4ASC->objectTypeIndex = tmp_OTi; tmp = (uint8_t)faad_getbits(&ld, 4 DEBUGVAR(1,12,"parse_audio_decoder_specific_info(): extensionSamplingFrequencyIndex")); /* check for downsampled SBR */ if (tmp == mp4ASC->samplingFrequencyIndex) mp4ASC->downSampledSBR = 1; mp4ASC->samplingFrequencyIndex = tmp; if (mp4ASC->samplingFrequencyIndex == 15) { mp4ASC->samplingFrequency = (uint32_t)faad_getbits(&ld, 24 DEBUGVAR(1,13,"parse_audio_decoder_specific_info(): extensionSamplingFrequencyIndex")); } else { mp4ASC->samplingFrequency = get_sample_rate(mp4ASC->samplingFrequencyIndex); } } } } } /* no SBR signalled, this could mean either implicit signalling or no SBR in this file */ /* MPEG specification states: assume SBR on files with samplerate <= 24000 Hz */ if (mp4ASC->sbr_present_flag == -1) { if (mp4ASC->samplingFrequency <= 24000) { mp4ASC->samplingFrequency *= 2; mp4ASC->forceUpSampling = 1; } else /* > 24000*/ { mp4ASC->downSampledSBR = 1; } } #endif faad_endbits(&ld); return result; }
/* table 2 */ uint8_t sbr_extension_data(bitfile *ld, sbr_info *sbr, uint16_t cnt) { uint8_t result = 0; uint16_t num_align_bits = 0; uint16_t num_sbr_bits = (uint16_t)faad_get_processed_bits(ld); #ifdef DRM if (!sbr->Is_DRM_SBR) #endif { uint8_t bs_extension_type = (uint8_t)faad_getbits(ld, 4 DEBUGVAR(1,198,"sbr_bitstream(): bs_extension_type")); if (bs_extension_type == EXT_SBR_DATA_CRC) { sbr->bs_sbr_crc_bits = (uint16_t)faad_getbits(ld, 10 DEBUGVAR(1,199,"sbr_bitstream(): bs_sbr_crc_bits")); } } sbr->bs_header_flag = faad_get1bit(ld DEBUGVAR(1,200,"sbr_bitstream(): bs_header_flag")); if (sbr->bs_header_flag) sbr_header(ld, sbr); /* Reset? */ sbr_reset(sbr); /* first frame should have a header */ //if (!(sbr->frame == 0 && sbr->bs_header_flag == 0)) if (sbr->header_count != 0) { if (sbr->Reset || (sbr->bs_header_flag && sbr->just_seeked)) { uint8_t k2; /* calculate the Master Frequency Table */ sbr->k0 = qmf_start_channel(sbr->bs_start_freq, sbr->bs_samplerate_mode, sbr->sample_rate); k2 = qmf_stop_channel(sbr->bs_stop_freq, sbr->sample_rate, sbr->k0); /* check k0 and k2 */ if (sbr->sample_rate >= 48000) { if ((k2 - sbr->k0) > 32) result += 1; } else if (sbr->sample_rate <= 32000) { if ((k2 - sbr->k0) > 48) result += 1; } else { /* (sbr->sample_rate == 44100) */ if ((k2 - sbr->k0) > 45) result += 1; } if (sbr->bs_freq_scale == 0) { result += master_frequency_table_fs0(sbr, sbr->k0, k2, sbr->bs_alter_scale); } else { result += master_frequency_table(sbr, sbr->k0, k2, sbr->bs_freq_scale, sbr->bs_alter_scale); } result += derived_frequency_table(sbr, sbr->bs_xover_band, k2); result = (result > 0) ? 1 : 0; } if (result == 0) result = sbr_data(ld, sbr); } else { result = 1; } #ifdef DRM if (!sbr->Is_DRM_SBR) #endif { num_sbr_bits = (uint16_t)faad_get_processed_bits(ld) - num_sbr_bits; /* -4 does not apply, bs_extension_type is re-read in this function */ num_align_bits = 8*cnt /*- 4*/ - num_sbr_bits; while (num_align_bits > 7) { faad_getbits(ld, 8 DEBUGVAR(1,999,"sbr_bitstream(): num_align_bits")); num_align_bits -= 8; } faad_getbits(ld, num_align_bits DEBUGVAR(1,999,"sbr_bitstream(): num_align_bits")); } return result; }
/* table 2 */ uint8_t sbr_extension_data(bitfile *ld, sbr_info *sbr, uint16_t cnt, uint8_t psResetFlag) { uint8_t result = 0; uint16_t num_align_bits = 0; uint16_t num_sbr_bits1 = (uint16_t)faad_get_processed_bits(ld); uint16_t num_sbr_bits2; uint8_t saved_start_freq, saved_samplerate_mode; uint8_t saved_stop_freq, saved_freq_scale; uint8_t saved_alter_scale, saved_xover_band; #if (defined(PS_DEC) || defined(DRM_PS)) if (psResetFlag) sbr->psResetFlag = psResetFlag; #endif #ifdef DRM if (!sbr->Is_DRM_SBR) #endif { uint8_t bs_extension_type = (uint8_t)faad_getbits(ld, 4 DEBUGVAR(1,198,"sbr_bitstream(): bs_extension_type")); if (bs_extension_type == EXT_SBR_DATA_CRC) { sbr->bs_sbr_crc_bits = (uint16_t)faad_getbits(ld, 10 DEBUGVAR(1,199,"sbr_bitstream(): bs_sbr_crc_bits")); } } /* save old header values, in case the new ones are corrupted */ saved_start_freq = sbr->bs_start_freq; saved_samplerate_mode = sbr->bs_samplerate_mode; saved_stop_freq = sbr->bs_stop_freq; saved_freq_scale = sbr->bs_freq_scale; saved_alter_scale = sbr->bs_alter_scale; saved_xover_band = sbr->bs_xover_band; sbr->bs_header_flag = faad_get1bit(ld DEBUGVAR(1,200,"sbr_bitstream(): bs_header_flag")); if (sbr->bs_header_flag) sbr_header(ld, sbr); /* Reset? */ sbr_reset(sbr); /* first frame should have a header */ //if (!(sbr->frame == 0 && sbr->bs_header_flag == 0)) if (sbr->header_count != 0) { if (sbr->Reset || (sbr->bs_header_flag && sbr->just_seeked)) { uint8_t rt = calc_sbr_tables(sbr, sbr->bs_start_freq, sbr->bs_stop_freq, sbr->bs_samplerate_mode, sbr->bs_freq_scale, sbr->bs_alter_scale, sbr->bs_xover_band); /* if an error occured with the new header values revert to the old ones */ if (rt > 0) { calc_sbr_tables(sbr, saved_start_freq, saved_stop_freq, saved_samplerate_mode, saved_freq_scale, saved_alter_scale, saved_xover_band); } } if (result == 0) { result = sbr_data(ld, sbr); /* sbr_data() returning an error means that there was an error in envelope_time_border_vector(). In this case the old time border vector is saved and all the previous data normally read after sbr_grid() is saved. */ /* to be on the safe side, calculate old sbr tables in case of error */ if ((result > 0) && (sbr->Reset || (sbr->bs_header_flag && sbr->just_seeked))) { calc_sbr_tables(sbr, saved_start_freq, saved_stop_freq, saved_samplerate_mode, saved_freq_scale, saved_alter_scale, saved_xover_band); } /* we should be able to safely set result to 0 now, */ /* but practise indicates this doesn't work well */ } } else { result = 1; } num_sbr_bits2 = (uint16_t)faad_get_processed_bits(ld) - num_sbr_bits1; /* check if we read more bits then were available for sbr */ if (8*cnt < num_sbr_bits2) { faad_resetbits(ld, num_sbr_bits1 + 8*cnt); num_sbr_bits2 = 8*cnt; #ifdef PS_DEC /* turn off PS for the unfortunate case that we randomly read some * PS data that looks correct */ sbr->ps_used = 0; #endif /* Make sure it doesn't decode SBR in this frame, or we'll get glitches */ return 1; } #ifdef DRM if (!sbr->Is_DRM_SBR) #endif { /* -4 does not apply, bs_extension_type is re-read in this function */ num_align_bits = 8*cnt /*- 4*/ - num_sbr_bits2; while (num_align_bits > 7) { faad_getbits(ld, 8 DEBUGVAR(1,999,"sbr_bitstream(): num_align_bits")); num_align_bits -= 8; } faad_getbits(ld, num_align_bits DEBUGVAR(1,999,"sbr_bitstream(): num_align_bits")); } return result; }