ref: c0ae72652fc9619e8b1e8f365ab977614179779a
dir: /libfaad/sbr_syntax.c/
/*
** 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 [email protected].
**
** $Id: sbr_syntax.c,v 1.15 2003/11/12 20:47:58 menno 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
uint8_t crc_len;
if (sbr->Is_DRM_SBR)
faad_getbits(ld, 8); /* 8-bit CRC */
else
#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"));
#ifdef DRM
if (sbr->Is_DRM_SBR)
{
/* Check CRC, get number of bits for check */
if (sbr->id_aac == ID_SCE)
{
if (sbr->lcstereo_flag)
{
if (sbr->bs_header_flag)
crc_len = min(76, sbr->data_size_bits);
else
crc_len = min(47, sbr->data_size_bits);
} else {
if (sbr->bs_header_flag)
crc_len = min(74, sbr->data_size_bits);
else
crc_len = min(47, sbr->data_size_bits);
}
} else {
if (sbr->bs_header_flag)
crc_len = min(120, sbr->data_size_bits);
else
crc_len = min(93, sbr->data_size_bits);
}
if ((result = faad_check_CRC(ld, crc_len)) > 0)
return result;
/* Rewind and read bits again to set correct position in bit-stream */
faad_rewindbits(ld);
faad_getbits(ld, 8);
faad_get1bit(ld);
}
#endif
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++;
#ifdef DRM
/* protocol_version (should be 0) */
if (sbr->Is_DRM_SBR)
faad_getbits(ld, 2);
#endif
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 = faad_getbits(ld, 4
DEBUGVAR(1,204,"sbr_header(): bs_start_freq"));
sbr->bs_stop_freq = faad_getbits(ld, 4
DEBUGVAR(1,205,"sbr_header(): bs_stop_freq"));
sbr->bs_xover_band = 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"));
#ifdef DRM
if (sbr->Is_DRM_SBR)
sbr->bs_dataextra = faad_getbits(ld, 1);
#endif
bs_header_extra_1 = faad_get1bit(ld
DEBUGVAR(1,208,"sbr_header(): bs_header_extra_1"));
bs_header_extra_2 = faad_get1bit(ld
DEBUGVAR(1,209,"sbr_header(): bs_header_extra_2"));
#ifdef DRM
/* No low complexity stereo support so far */
if ((sbr->lcstereo_flag) && (sbr->Is_DRM_SBR))
faad_getbits(ld, 2);
#endif
if (bs_header_extra_1)
{
sbr->bs_freq_scale = faad_getbits(ld, 2
DEBUGVAR(1,211,"sbr_header(): bs_freq_scale"));
sbr->bs_alter_scale = faad_get1bit(ld
DEBUGVAR(1,212,"sbr_header(): bs_alter_scale"));
sbr->bs_noise_bands = 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 = faad_getbits(ld, 2
DEBUGVAR(1,214,"sbr_header(): bs_limiter_bands"));
sbr->bs_limiter_gains = faad_getbits(ld, 2
DEBUGVAR(1,215,"sbr_header(): bs_limiter_gains"));
sbr->bs_interpol_freq = faad_get1bit(ld
DEBUGVAR(1,216,"sbr_header(): bs_interpol_freq"));
sbr->bs_smoothing_mode = faad_get1bit(ld
DEBUGVAR(1,217,"sbr_header(): bs_smoothing_mode"));
#ifdef DRM
/* reserved */
if (sbr->Is_DRM_SBR)
faad_get1bit(ld);
#endif
} 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;
#ifdef DRM
if (sbr->Is_DRM_SBR)
sbr->rate = 2;
#endif
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;
#ifdef DRM
if (!sbr->Is_DRM_SBR)
#endif
{
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"));
}
}
if ((result = sbr_grid(ld, sbr, 0)) > 0)
return result;
sbr_dtdf(ld, sbr, 0);
invf_mode(ld, sbr, 0);
#ifdef DRM
if (sbr->Is_DRM_SBR)
{
/* sbr mode not needed in V1.0. Should be set to 2 by a V1.0 encoder */
faad_getbits(ld, 2);
if (sbr->bs_dataextra)
faad_getbits(ld, 3); /* reserved */
}
#endif
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));
#ifdef DRM
if (sbr->Is_DRM_SBR)
sbr->bs_add_harmonic_flag[0] = 0;
else
#endif
{
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 = faad_getbits(ld, 4
DEBUGVAR(1,225,"sbr_single_channel_element(): bs_extension_size"));
if (cnt == 15)
{
cnt += 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 = 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 = 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;
#ifdef DRM
if (!sbr->Is_DRM_SBR)
#endif
{
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);
#ifdef DRM
if (sbr->Is_DRM_SBR)
{
/* sbr mode not needed in V1.0. Should be set to 2 by a V1.0 encoder */
faad_getbits(ld, 2);
if (sbr->bs_dataextra)
faad_getbits(ld, 3); /* reserved */
}
#endif
/* 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));
#ifdef DRM
if (sbr->Is_DRM_SBR)
sbr->bs_add_harmonic_flag[0] = 0;
else
#endif
{
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);
#ifdef DRM
if (sbr->Is_DRM_SBR)
sbr->bs_add_harmonic_flag[1] = 0;
else
#endif
{
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);
#ifdef DRM
if (sbr->Is_DRM_SBR)
{
/* sbr mode not needed in V1.0. Should be set to 2 by a V1.0 encoder */
faad_getbits(ld, 2);
faad_getbits(ld, 2);
if (sbr->bs_dataextra)
faad_getbits(ld, 6); /* reserved */
}
#endif
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));
#ifdef DRM
if (sbr->Is_DRM_SBR)
sbr->bs_add_harmonic_flag[0] = 0;
else
#endif
{
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);
#ifdef DRM
if (sbr->Is_DRM_SBR)
sbr->bs_add_harmonic_flag[1] = 0;
else
#endif
{
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 = faad_getbits(ld, 4
DEBUGVAR(1,234,"sbr_channel_pair_element(): bs_extension_size"));
if (cnt == 15)
{
cnt += 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 = 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 = 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;
}
/* 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;
uint16_t bs_num_env;
sbr->bs_frame_class[ch] = faad_getbits(ld, 2
DEBUGVAR(1,248,"sbr_grid(): bs_frame_class"));
switch (sbr->bs_frame_class[ch])
{
case FIXFIX:
i = faad_getbits(ld, 2
DEBUGVAR(1,249,"sbr_grid(): bs_num_env_raw"));
bs_num_env = min(1 << i, 5);
i = 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:
#ifdef DRM
if (sbr->Is_DRM_SBR)
{
bs_abs_bord = faad_getbits(ld, 3
DEBUGVAR(1,251,"sbr_grid(): bs_abs_bord")) + sbr->numTimeSlots;
} else
#endif
{
bs_abs_bord = faad_getbits(ld, 2
DEBUGVAR(1,251,"sbr_grid(): bs_abs_bord")) + sbr->numTimeSlots;
}
bs_num_env = 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 * faad_getbits(ld, 2
DEBUGVAR(1,253,"sbr_grid(): bs_rel_bord")) + 2;
}
i = int_log2((int32_t)(bs_num_env + 1));
sbr->bs_pointer[ch] = 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] = 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:
#ifdef DRM
if (sbr->Is_DRM_SBR)
{
bs_abs_bord = faad_getbits(ld, 3
DEBUGVAR(1,256,"sbr_grid(): bs_abs_bord"));
} else
#endif
{
bs_abs_bord = faad_getbits(ld, 2
DEBUGVAR(1,256,"sbr_grid(): bs_abs_bord"));
}
bs_num_env = 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 * faad_getbits(ld, 2
DEBUGVAR(1,258,"sbr_grid(): bs_rel_bord")) + 2;
}
i = int_log2((int32_t)(bs_num_env + 1));
sbr->bs_pointer[ch] = faad_getbits(ld, i
DEBUGVAR(1,259,"sbr_grid(): bs_pointer"));
for (env = 0; env < bs_num_env; env++)
{
sbr->f[ch][env] = 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:
#ifdef DRM
if (sbr->Is_DRM_SBR)
{
bs_abs_bord = faad_getbits(ld, 3
DEBUGVAR(1,261,"sbr_grid(): bs_abs_bord_0"));
bs_abs_bord_1 = faad_getbits(ld, 3
DEBUGVAR(1,262,"sbr_grid(): bs_abs_bord_1")) + sbr->numTimeSlots;
}
else
#endif
{
bs_abs_bord = faad_getbits(ld, 2
DEBUGVAR(1,261,"sbr_grid(): bs_abs_bord_0"));
bs_abs_bord_1 = faad_getbits(ld, 2
DEBUGVAR(1,262,"sbr_grid(): bs_abs_bord_1")) + sbr->numTimeSlots;
}
sbr->bs_num_rel_0[ch] = faad_getbits(ld, 2
DEBUGVAR(1,263,"sbr_grid(): bs_num_rel_0"));
sbr->bs_num_rel_1[ch] = 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 * 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 * faad_getbits(ld, 2
DEBUGVAR(1,266,"sbr_grid(): bs_rel_bord")) + 2;
}
i = int_log2((int32_t)(sbr->bs_num_rel_0[ch] + sbr->bs_num_rel_1[ch] + 2));
sbr->bs_pointer[ch] = faad_getbits(ld, i
DEBUGVAR(1,267,"sbr_grid(): bs_pointer"));
for (env = 0; env < bs_num_env; env++)
{
sbr->f[ch][env] = 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;
#ifdef DRM
if (sbr->Is_DRM_SBR)
{
/* Only one inv_mode in DRM */
uint8_t invf_mode;
invf_mode = faad_getbits(ld, 2
DEBUGVAR(1,271,"invf_mode(): bs_invf_mode"));
for (n = 0; n < sbr->N_Q; n++)
sbr->bs_invf_mode[ch][n] = invf_mode;
} else
#endif
{
for (n = 0; n < sbr->N_Q; n++)
{
sbr->bs_invf_mode[ch][n] = 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 */