diff options
Diffstat (limited to 'src/libfaad/sbr_syntax.c')
| -rw-r--r-- | src/libfaad/sbr_syntax.c | 665 |
1 files changed, 665 insertions, 0 deletions
diff --git a/src/libfaad/sbr_syntax.c b/src/libfaad/sbr_syntax.c new file mode 100644 index 000000000..f24aff986 --- /dev/null +++ b/src/libfaad/sbr_syntax.c @@ -0,0 +1,665 @@ +/* +** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding +** Copyright (C) 2003 M. Bakker, Ahead Software AG, http://www.nero.com +** +** This program is free software; you can redistribute it and/or modify +** it under the terms of the GNU General Public License as published by +** the Free Software Foundation; either version 2 of the License, or +** (at your option) any later version. +** +** This program is distributed in the hope that it will be useful, +** but WITHOUT ANY WARRANTY; without even the implied warranty of +** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +** GNU General Public License for more details. +** +** You should have received a copy of the GNU General Public License +** along with this program; if not, write to the Free Software +** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +** +** Any non-GPL usage of this software or parts of this software is strictly +** forbidden. +** +** Commercial non-GPL licensing of this software is possible. +** For more info contact Ahead Software through Mpeg4AAClicense@nero.com. +** +** $Id: sbr_syntax.c,v 1.3 2003/12/30 02:00:11 miguelfreitas Exp $ +**/ + +#include "common.h" +#include "structs.h" + +#ifdef SBR_DEC + +#include "sbr_syntax.h" +#include "syntax.h" +#include "sbr_huff.h" +#include "sbr_fbt.h" +#include "sbr_tf_grid.h" +#include "sbr_e_nf.h" +#include "bits.h" +#include "analysis.h" + +static void sbr_reset(sbr_info *sbr) +{ +#if 0 + printf("%d\n", sbr->bs_start_freq_prev); + printf("%d\n", sbr->bs_stop_freq_prev); + printf("%d\n", sbr->bs_freq_scale_prev); + printf("%d\n", sbr->bs_alter_scale_prev); + printf("%d\n", sbr->bs_xover_band_prev); + printf("%d\n\n", sbr->bs_noise_bands_prev); +#endif + + /* if these are different from the previous frame: Reset = 1 */ + if ((sbr->bs_start_freq != sbr->bs_start_freq_prev) || + (sbr->bs_stop_freq != sbr->bs_stop_freq_prev) || + (sbr->bs_freq_scale != sbr->bs_freq_scale_prev) || + (sbr->bs_alter_scale != sbr->bs_alter_scale_prev)) + { + sbr->Reset = 1; + } else { + sbr->Reset = 0; + } + + if ((sbr->bs_start_freq != sbr->bs_start_freq_prev) || + (sbr->bs_stop_freq != sbr->bs_stop_freq_prev) || + (sbr->bs_freq_scale != sbr->bs_freq_scale_prev) || + (sbr->bs_alter_scale != sbr->bs_alter_scale_prev) || + (sbr->bs_xover_band != sbr->bs_xover_band_prev) || + (sbr->bs_noise_bands != sbr->bs_noise_bands_prev)) + { + sbr->Reset = 1; + } else { + sbr->Reset = 0; + } + + sbr->bs_start_freq_prev = sbr->bs_start_freq; + sbr->bs_stop_freq_prev = sbr->bs_stop_freq; + sbr->bs_freq_scale_prev = sbr->bs_freq_scale; + sbr->bs_alter_scale_prev = sbr->bs_alter_scale; + sbr->bs_xover_band_prev = sbr->bs_xover_band; + sbr->bs_noise_bands_prev = sbr->bs_noise_bands; + + if (sbr->frame == 0) + { + sbr->Reset = 1; + } +} + +/* table 2 */ +uint8_t sbr_extension_data(bitfile *ld, sbr_info *sbr) +{ + uint8_t result; + +#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); + + /* TODO: Reset? */ + sbr_reset(sbr); + + /* first frame should have a header */ + if (sbr->frame == 0 && sbr->bs_header_flag == 0) + return 1; + + + 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) + return 1; + } else if (sbr->sample_rate <= 32000) { + if ((k2 - sbr->k0) > 48) + return 1; + } else { /* (sbr->sample_rate == 44100) */ + if ((k2 - sbr->k0) > 45) + return 1; + } + + if (sbr->bs_freq_scale == 0) + { + master_frequency_table_fs0(sbr, sbr->k0, k2, sbr->bs_alter_scale); + } else { + master_frequency_table(sbr, sbr->k0, k2, sbr->bs_freq_scale, + sbr->bs_alter_scale); + } + if ((result = derived_frequency_table(sbr, sbr->bs_xover_band, k2)) > 0) + return result; + } + + if ((result = sbr_data(ld, sbr)) > 0) + return result; + + /* no error */ + return 0; +} + +/* table 3 */ +static void sbr_header(bitfile *ld, sbr_info *sbr) +{ + uint8_t bs_header_extra_1, bs_header_extra_2; + + sbr->header_count++; + + sbr->bs_amp_res = faad_get1bit(ld + DEBUGVAR(1,203,"sbr_header(): bs_amp_res")); + + /* bs_start_freq and bs_stop_freq must define a fequency band that does + not exceed 48 channels */ + sbr->bs_start_freq = (uint8_t)faad_getbits(ld, 4 + DEBUGVAR(1,204,"sbr_header(): bs_start_freq")); + sbr->bs_stop_freq = (uint8_t)faad_getbits(ld, 4 + DEBUGVAR(1,205,"sbr_header(): bs_stop_freq")); + sbr->bs_xover_band = (uint8_t)faad_getbits(ld, 3 + DEBUGVAR(1,206,"sbr_header(): bs_xover_band")); + faad_getbits(ld, 2 + DEBUGVAR(1,207,"sbr_header(): bs_reserved_bits_hdr")); + bs_header_extra_1 = (uint8_t)faad_get1bit(ld + DEBUGVAR(1,208,"sbr_header(): bs_header_extra_1")); + bs_header_extra_2 = (uint8_t)faad_get1bit(ld + DEBUGVAR(1,209,"sbr_header(): bs_header_extra_2")); + + if (bs_header_extra_1) + { + sbr->bs_freq_scale = (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,211,"sbr_header(): bs_freq_scale")); + sbr->bs_alter_scale = (uint8_t)faad_get1bit(ld + DEBUGVAR(1,212,"sbr_header(): bs_alter_scale")); + sbr->bs_noise_bands = (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,213,"sbr_header(): bs_noise_bands")); + } else { + /* Default values */ + sbr->bs_freq_scale = 2; + sbr->bs_alter_scale = 1; + sbr->bs_noise_bands = 2; + } + + if (bs_header_extra_2) + { + sbr->bs_limiter_bands = (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,214,"sbr_header(): bs_limiter_bands")); + sbr->bs_limiter_gains = (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,215,"sbr_header(): bs_limiter_gains")); + sbr->bs_interpol_freq = (uint8_t)faad_get1bit(ld + DEBUGVAR(1,216,"sbr_header(): bs_interpol_freq")); + sbr->bs_smoothing_mode = (uint8_t)faad_get1bit(ld + DEBUGVAR(1,217,"sbr_header(): bs_smoothing_mode")); + } else { + /* Default values */ + sbr->bs_limiter_bands = 2; + sbr->bs_limiter_gains = 2; + sbr->bs_interpol_freq = 1; + sbr->bs_smoothing_mode = 1; + } + +#if 0 + /* print the header to screen */ + printf("bs_amp_res: %d\n", sbr->bs_amp_res); + printf("bs_start_freq: %d\n", sbr->bs_start_freq); + printf("bs_stop_freq: %d\n", sbr->bs_stop_freq); + printf("bs_xover_band: %d\n", sbr->bs_xover_band); + if (bs_header_extra_1) + { + printf("bs_freq_scale: %d\n", sbr->bs_freq_scale); + printf("bs_alter_scale: %d\n", sbr->bs_alter_scale); + printf("bs_noise_bands: %d\n", sbr->bs_noise_bands); + } + if (bs_header_extra_2) + { + printf("bs_limiter_bands: %d\n", sbr->bs_limiter_bands); + printf("bs_limiter_gains: %d\n", sbr->bs_limiter_gains); + printf("bs_interpol_freq: %d\n", sbr->bs_interpol_freq); + printf("bs_smoothing_mode: %d\n", sbr->bs_smoothing_mode); + } + printf("\n"); +#endif +} + +/* table 4 */ +static uint8_t sbr_data(bitfile *ld, sbr_info *sbr) +{ + uint8_t result; +#if 0 + sbr->bs_samplerate_mode = faad_get1bit(ld + DEBUGVAR(1,219,"sbr_data(): bs_samplerate_mode")); +#endif + + sbr->rate = (sbr->bs_samplerate_mode) ? 2 : 1; + + switch (sbr->id_aac) + { + case ID_SCE: + if ((result = sbr_single_channel_element(ld, sbr)) > 0) + return result; + break; + case ID_CPE: + if ((result = sbr_channel_pair_element(ld, sbr)) > 0) + return result; + break; + } + + return 0; +} + +/* table 5 */ +static uint8_t sbr_single_channel_element(bitfile *ld, sbr_info *sbr) +{ + uint8_t result; + + if (faad_get1bit(ld + DEBUGVAR(1,220,"sbr_single_channel_element(): bs_data_extra"))) + { + faad_getbits(ld, 4 + DEBUGVAR(1,221,"sbr_single_channel_element(): bs_reserved_bits_data")); + } + +#ifdef DRM + /* bs_coupling, from sbr_channel_pair_base_element(bs_amp_res) */ + if (sbr->Is_DRM_SBR) + faad_get1bit(ld); +#endif + + if ((result = sbr_grid(ld, sbr, 0)) > 0) + return result; + sbr_dtdf(ld, sbr, 0); + invf_mode(ld, sbr, 0); + sbr_envelope(ld, sbr, 0); + sbr_noise(ld, sbr, 0); + + envelope_noise_dequantisation(sbr, 0); + + memset(sbr->bs_add_harmonic[0], 0, 64*sizeof(uint8_t)); + + sbr->bs_add_harmonic_flag[0] = faad_get1bit(ld + DEBUGVAR(1,223,"sbr_single_channel_element(): bs_add_harmonic_flag[0]")); + if (sbr->bs_add_harmonic_flag[0]) + sinusoidal_coding(ld, sbr, 0); + + sbr->bs_extended_data = faad_get1bit(ld + DEBUGVAR(1,224,"sbr_single_channel_element(): bs_extended_data[0]")); + if (sbr->bs_extended_data) + { + uint16_t nr_bits_left; + uint16_t cnt = (uint16_t)faad_getbits(ld, 4 + DEBUGVAR(1,225,"sbr_single_channel_element(): bs_extension_size")); + if (cnt == 15) + { + cnt += (uint16_t)faad_getbits(ld, 8 + DEBUGVAR(1,226,"sbr_single_channel_element(): bs_esc_count")); + } + + nr_bits_left = 8 * cnt; + while (nr_bits_left > 7) + { + sbr->bs_extension_id = (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,227,"sbr_single_channel_element(): bs_extension_id")); + nr_bits_left -= 2; + /* sbr_extension(ld, sbr, 0, nr_bits_left); */ +#ifdef DRM + if (!sbr->Is_DRM_SBR) +#endif + { + sbr->bs_extension_data = (uint8_t)faad_getbits(ld, 6 + DEBUGVAR(1,279,"sbr_single_channel_element(): bs_extension_data")); + } + } + + /* Corrigendum */ + faad_getbits(ld, nr_bits_left + DEBUGVAR(1,280,"sbr_single_channel_element(): nr_bits_left")); + } + + return 0; +} + +/* table 6 */ +static uint8_t sbr_channel_pair_element(bitfile *ld, sbr_info *sbr) +{ + uint8_t n, result; + + if (faad_get1bit(ld + DEBUGVAR(1,228,"sbr_single_channel_element(): bs_data_extra"))) + { + faad_getbits(ld, 4 + DEBUGVAR(1,228,"sbr_channel_pair_element(): bs_reserved_bits_data")); + faad_getbits(ld, 4 + DEBUGVAR(1,228,"sbr_channel_pair_element(): bs_reserved_bits_data")); + } + + sbr->bs_coupling = faad_get1bit(ld + DEBUGVAR(1,228,"sbr_channel_pair_element(): bs_coupling")); + + if (sbr->bs_coupling) + { + if ((result = sbr_grid(ld, sbr, 0)) > 0) + return result; + + /* need to copy some data from left to right */ + sbr->bs_frame_class[1] = sbr->bs_frame_class[0]; + sbr->L_E[1] = sbr->L_E[0]; + sbr->L_Q[1] = sbr->L_Q[0]; + sbr->bs_pointer[1] = sbr->bs_pointer[0]; + + for (n = 0; n <= sbr->L_E[0]; n++) + { + sbr->t_E[1][n] = sbr->t_E[0][n]; + sbr->f[1][n] = sbr->f[0][n]; + } + for (n = 0; n <= sbr->L_Q[0]; n++) + sbr->t_Q[1][n] = sbr->t_Q[0][n]; + + sbr_dtdf(ld, sbr, 0); + sbr_dtdf(ld, sbr, 1); + invf_mode(ld, sbr, 0); + + /* more copying */ + for (n = 0; n < sbr->N_Q; n++) + sbr->bs_invf_mode[1][n] = sbr->bs_invf_mode[0][n]; + + sbr_envelope(ld, sbr, 0); + sbr_noise(ld, sbr, 0); + sbr_envelope(ld, sbr, 1); + sbr_noise(ld, sbr, 1); + + memset(sbr->bs_add_harmonic[0], 0, 64*sizeof(uint8_t)); + memset(sbr->bs_add_harmonic[1], 0, 64*sizeof(uint8_t)); + + sbr->bs_add_harmonic_flag[0] = faad_get1bit(ld + DEBUGVAR(1,231,"sbr_channel_pair_element(): bs_add_harmonic_flag[0]")); + if (sbr->bs_add_harmonic_flag[0]) + sinusoidal_coding(ld, sbr, 0); + + sbr->bs_add_harmonic_flag[1] = faad_get1bit(ld + DEBUGVAR(1,232,"sbr_channel_pair_element(): bs_add_harmonic_flag[1]")); + if (sbr->bs_add_harmonic_flag[1]) + sinusoidal_coding(ld, sbr, 1); + } else { + if ((result = sbr_grid(ld, sbr, 0)) > 0) + return result; + if ((result = sbr_grid(ld, sbr, 1)) > 0) + return result; + sbr_dtdf(ld, sbr, 0); + sbr_dtdf(ld, sbr, 1); + invf_mode(ld, sbr, 0); + invf_mode(ld, sbr, 1); + sbr_envelope(ld, sbr, 0); + sbr_envelope(ld, sbr, 1); + sbr_noise(ld, sbr, 0); + sbr_noise(ld, sbr, 1); + + memset(sbr->bs_add_harmonic[0], 0, 64*sizeof(uint8_t)); + memset(sbr->bs_add_harmonic[1], 0, 64*sizeof(uint8_t)); + + sbr->bs_add_harmonic_flag[0] = faad_get1bit(ld + DEBUGVAR(1,239,"sbr_channel_pair_element(): bs_add_harmonic_flag[0]")); + if (sbr->bs_add_harmonic_flag[0]) + sinusoidal_coding(ld, sbr, 0); + + sbr->bs_add_harmonic_flag[1] = faad_get1bit(ld + DEBUGVAR(1,240,"sbr_channel_pair_element(): bs_add_harmonic_flag[1]")); + if (sbr->bs_add_harmonic_flag[1]) + sinusoidal_coding(ld, sbr, 1); + } + envelope_noise_dequantisation(sbr, 0); + envelope_noise_dequantisation(sbr, 1); + + if (sbr->bs_coupling) + unmap_envelope_noise(sbr); + + sbr->bs_extended_data = faad_get1bit(ld + DEBUGVAR(1,233,"sbr_channel_pair_element(): bs_extended_data[0]")); + if (sbr->bs_extended_data) + { + uint16_t nr_bits_left; + uint16_t cnt = (uint16_t)faad_getbits(ld, 4 + DEBUGVAR(1,234,"sbr_channel_pair_element(): bs_extension_size")); + if (cnt == 15) + { + cnt += (uint16_t)faad_getbits(ld, 8 + DEBUGVAR(1,235,"sbr_channel_pair_element(): bs_esc_count")); + } + + nr_bits_left = 8 * cnt; + while (nr_bits_left > 7) + { + sbr->bs_extension_id = (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,236,"sbr_channel_pair_element(): bs_extension_id")); + nr_bits_left -= 2; + /* sbr_extension(ld, sbr, 0, nr_bits_left); */ +#ifdef DRM + if (!sbr->Is_DRM_SBR) +#endif + { + sbr->bs_extension_data = (uint8_t)faad_getbits(ld, 6 + DEBUGVAR(1,280,"sbr_channel_pair_element(): bs_extension_data")); + } + } + + /* Corrigendum */ + faad_getbits(ld, nr_bits_left + DEBUGVAR(1,280,"sbr_channel_pair_element(): nr_bits_left")); + } + + return 0; +} + +/* integer log[2](x): input range [0,10) */ +static int8_t sbr_log2(const int8_t val) +{ + int8_t log2tab[] = { 0, 0, 1, 2, 2, 3, 3, 3, 3, 4 }; + if (val < 10 && val >= 0) + return log2tab[val]; + else + return 0; +} + + +/* table 7 */ +static uint8_t sbr_grid(bitfile *ld, sbr_info *sbr, uint8_t ch) +{ + uint8_t i, env, rel, result; + uint8_t bs_abs_bord, bs_abs_bord_1; + uint8_t bs_num_env; + + sbr->bs_frame_class[ch] = (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,248,"sbr_grid(): bs_frame_class")); + + switch (sbr->bs_frame_class[ch]) + { + case FIXFIX: + i = (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,249,"sbr_grid(): bs_num_env_raw")); + + bs_num_env = min(1 << i, 5); + + i = (uint8_t)faad_get1bit(ld + DEBUGVAR(1,250,"sbr_grid(): bs_freq_res_flag")); + for (env = 0; env < bs_num_env; env++) + sbr->f[ch][env] = i; + + sbr->abs_bord_lead[ch] = 0; + sbr->abs_bord_trail[ch] = sbr->numTimeSlots; + sbr->n_rel_lead[ch] = bs_num_env - 1; + sbr->n_rel_trail[ch] = 0; + break; + + case FIXVAR: + bs_abs_bord = (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,251,"sbr_grid(): bs_abs_bord")) + sbr->numTimeSlots; + bs_num_env = (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,252,"sbr_grid(): bs_num_env")) + 1; + + for (rel = 0; rel < bs_num_env-1; rel++) + { + sbr->bs_rel_bord[ch][rel] = 2 * (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,253,"sbr_grid(): bs_rel_bord")) + 2; + } + i = sbr_log2(bs_num_env + 1); + sbr->bs_pointer[ch] = (uint8_t)faad_getbits(ld, i + DEBUGVAR(1,254,"sbr_grid(): bs_pointer")); + + for (env = 0; env < bs_num_env; env++) + { + sbr->f[ch][bs_num_env - env - 1] = (uint8_t)faad_get1bit(ld + DEBUGVAR(1,255,"sbr_grid(): bs_freq_res")); + } + + sbr->abs_bord_lead[ch] = 0; + sbr->abs_bord_trail[ch] = bs_abs_bord; + sbr->n_rel_lead[ch] = 0; + sbr->n_rel_trail[ch] = bs_num_env - 1; + break; + + case VARFIX: + bs_abs_bord = (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,256,"sbr_grid(): bs_abs_bord")); + bs_num_env = (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,257,"sbr_grid(): bs_num_env")) + 1; + + for (rel = 0; rel < bs_num_env-1; rel++) + { + sbr->bs_rel_bord[ch][rel] = 2 * (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,258,"sbr_grid(): bs_rel_bord")) + 2; + } + i = sbr_log2(bs_num_env + 1); + sbr->bs_pointer[ch] = (uint8_t)faad_getbits(ld, i + DEBUGVAR(1,259,"sbr_grid(): bs_pointer")); + + for (env = 0; env < bs_num_env; env++) + { + sbr->f[ch][env] = (uint8_t)faad_get1bit(ld + DEBUGVAR(1,260,"sbr_grid(): bs_freq_res")); + } + + sbr->abs_bord_lead[ch] = bs_abs_bord; + sbr->abs_bord_trail[ch] = sbr->numTimeSlots; + sbr->n_rel_lead[ch] = bs_num_env - 1; + sbr->n_rel_trail[ch] = 0; + break; + + case VARVAR: + bs_abs_bord = (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,261,"sbr_grid(): bs_abs_bord_0")); + bs_abs_bord_1 = (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,262,"sbr_grid(): bs_abs_bord_1")) + sbr->numTimeSlots; + sbr->bs_num_rel_0[ch] = (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,263,"sbr_grid(): bs_num_rel_0")); + sbr->bs_num_rel_1[ch] = (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,264,"sbr_grid(): bs_num_rel_1")); + + bs_num_env = min(5, sbr->bs_num_rel_0[ch] + sbr->bs_num_rel_1[ch] + 1); + + for (rel = 0; rel < sbr->bs_num_rel_0[ch]; rel++) + { + sbr->bs_rel_bord_0[ch][rel] = 2 * (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,265,"sbr_grid(): bs_rel_bord")) + 2; + } + for(rel = 0; rel < sbr->bs_num_rel_1[ch]; rel++) + { + sbr->bs_rel_bord_1[ch][rel] = 2 * (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,266,"sbr_grid(): bs_rel_bord")) + 2; + } + i = sbr_log2(sbr->bs_num_rel_0[ch] + sbr->bs_num_rel_1[ch] + 2); + sbr->bs_pointer[ch] = (uint8_t)faad_getbits(ld, i + DEBUGVAR(1,267,"sbr_grid(): bs_pointer")); + + for (env = 0; env < bs_num_env; env++) + { + sbr->f[ch][env] = (uint8_t)faad_get1bit(ld + DEBUGVAR(1,268,"sbr_grid(): bs_freq_res")); + } + + sbr->abs_bord_lead[ch] = bs_abs_bord; + sbr->abs_bord_trail[ch] = bs_abs_bord_1; + sbr->n_rel_lead[ch] = sbr->bs_num_rel_0[ch]; + sbr->n_rel_trail[ch] = sbr->bs_num_rel_1[ch]; + break; + } + + if (sbr->bs_frame_class[ch] == VARVAR) + sbr->L_E[ch] = min(bs_num_env, 5); + else + sbr->L_E[ch] = min(bs_num_env, 4); + + if (sbr->L_E[ch] > 1) + sbr->L_Q[ch] = 2; + else + sbr->L_Q[ch] = 1; + + /* TODO: this code can probably be integrated into the code above! */ + if ((result = envelope_time_border_vector(sbr, ch)) > 0) + return result; + noise_floor_time_border_vector(sbr, ch); + + return 0; +} + +/* table 8 */ +static void sbr_dtdf(bitfile *ld, sbr_info *sbr, uint8_t ch) +{ + uint8_t i; + + for (i = 0; i < sbr->L_E[ch]; i++) + { + sbr->bs_df_env[ch][i] = faad_get1bit(ld + DEBUGVAR(1,269,"sbr_dtdf(): bs_df_env")); + } + + for (i = 0; i < sbr->L_Q[ch]; i++) + { + sbr->bs_df_noise[ch][i] = faad_get1bit(ld + DEBUGVAR(1,270,"sbr_dtdf(): bs_df_noise")); + } +} + +/* table 9 */ +static void invf_mode(bitfile *ld, sbr_info *sbr, uint8_t ch) +{ + uint8_t n; + + for (n = 0; n < sbr->N_Q; n++) + { + sbr->bs_invf_mode[ch][n] = (uint8_t)faad_getbits(ld, 2 + DEBUGVAR(1,271,"invf_mode(): bs_invf_mode")); + } +} + +/* table 12 */ +static void sinusoidal_coding(bitfile *ld, sbr_info *sbr, uint8_t ch) +{ + uint8_t n; + + for (n = 0; n < sbr->N_high; n++) + { + sbr->bs_add_harmonic[ch][n] = faad_get1bit(ld + DEBUGVAR(1,278,"sinusoidal_coding(): bs_add_harmonic")); + } +} + + +#endif /* SBR_DEC */ |