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FFmpeg/libavcodec/aacsbr_template.c
Rostislav Pehlivanov a04ae469e7 aacsbr: reduce element type mismatch warning severity 
All HE-AAC samples with an LFE channel make this warning get spammed on
every frame. Turning off SBR for LFE channels makes sense (since it has
much less coefficients than normal channels do), so this error print is
of no value in this case.
It makes sense to keep the error in other cases, hence why it's still
around, degraded to warning severity since the decoder will still
attempt to decode without SBR.

Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
2016-06-08 21:01:04 +01:00

1572 lines
58 KiB
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/*
* AAC Spectral Band Replication decoding functions
* Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
* Copyright (c) 2009-2010 Alex Converse <alex.converse@gmail.com>
*
* Fixed point code
* Copyright (c) 2013
* MIPS Technologies, Inc., California.
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* AAC Spectral Band Replication decoding functions
* @author Robert Swain ( rob opendot cl )
* @author Stanislav Ocovaj ( stanislav.ocovaj@imgtec.com )
* @author Zoran Basaric ( zoran.basaric@imgtec.com )
*/
#include "libavutil/qsort.h"
av_cold void AAC_RENAME(ff_aac_sbr_init)(void)
{
static const struct {
const void *sbr_codes, *sbr_bits;
const unsigned int table_size, elem_size;
} sbr_tmp[] = {
SBR_VLC_ROW(t_huffman_env_1_5dB),
SBR_VLC_ROW(f_huffman_env_1_5dB),
SBR_VLC_ROW(t_huffman_env_bal_1_5dB),
SBR_VLC_ROW(f_huffman_env_bal_1_5dB),
SBR_VLC_ROW(t_huffman_env_3_0dB),
SBR_VLC_ROW(f_huffman_env_3_0dB),
SBR_VLC_ROW(t_huffman_env_bal_3_0dB),
SBR_VLC_ROW(f_huffman_env_bal_3_0dB),
SBR_VLC_ROW(t_huffman_noise_3_0dB),
SBR_VLC_ROW(t_huffman_noise_bal_3_0dB),
};
// SBR VLC table initialization
SBR_INIT_VLC_STATIC(0, 1098);
SBR_INIT_VLC_STATIC(1, 1092);
SBR_INIT_VLC_STATIC(2, 768);
SBR_INIT_VLC_STATIC(3, 1026);
SBR_INIT_VLC_STATIC(4, 1058);
SBR_INIT_VLC_STATIC(5, 1052);
SBR_INIT_VLC_STATIC(6, 544);
SBR_INIT_VLC_STATIC(7, 544);
SBR_INIT_VLC_STATIC(8, 592);
SBR_INIT_VLC_STATIC(9, 512);
aacsbr_tableinit();
AAC_RENAME(ff_ps_init)();
}
/** Places SBR in pure upsampling mode. */
static void sbr_turnoff(SpectralBandReplication *sbr) {
sbr->start = 0;
sbr->ready_for_dequant = 0;
// Init defults used in pure upsampling mode
sbr->kx[1] = 32; //Typo in spec, kx' inits to 32
sbr->m[1] = 0;
// Reset values for first SBR header
sbr->data[0].e_a[1] = sbr->data[1].e_a[1] = -1;
memset(&sbr->spectrum_params, -1, sizeof(SpectrumParameters));
}
av_cold void AAC_RENAME(ff_aac_sbr_ctx_init)(AACContext *ac, SpectralBandReplication *sbr)
{
if(sbr->mdct.mdct_bits)
return;
sbr->kx[0] = sbr->kx[1];
sbr_turnoff(sbr);
sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
/* SBR requires samples to be scaled to +/-32768.0 to work correctly.
* mdct scale factors are adjusted to scale up from +/-1.0 at analysis
* and scale back down at synthesis. */
AAC_RENAME_32(ff_mdct_init)(&sbr->mdct, 7, 1, 1.0 / (64 * 32768.0));
AAC_RENAME_32(ff_mdct_init)(&sbr->mdct_ana, 7, 1, -2.0 * 32768.0);
AAC_RENAME(ff_ps_ctx_init)(&sbr->ps);
AAC_RENAME(ff_sbrdsp_init)(&sbr->dsp);
aacsbr_func_ptr_init(&sbr->c);
}
av_cold void AAC_RENAME(ff_aac_sbr_ctx_close)(SpectralBandReplication *sbr)
{
AAC_RENAME_32(ff_mdct_end)(&sbr->mdct);
AAC_RENAME_32(ff_mdct_end)(&sbr->mdct_ana);
}
static int qsort_comparison_function_int16(const void *a, const void *b)
{
return *(const int16_t *)a - *(const int16_t *)b;
}
static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle)
{
int i;
for (i = 0; i <= last_el; i++)
if (table[i] == needle)
return 1;
return 0;
}
/// Limiter Frequency Band Table (14496-3 sp04 p198)
static void sbr_make_f_tablelim(SpectralBandReplication *sbr)
{
int k;
if (sbr->bs_limiter_bands > 0) {
static const INTFLOAT bands_warped[3] = { Q23(1.32715174233856803909f), //2^(0.49/1.2)
Q23(1.18509277094158210129f), //2^(0.49/2)
Q23(1.11987160404675912501f) }; //2^(0.49/3)
const INTFLOAT lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1];
int16_t patch_borders[7];
uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim;
patch_borders[0] = sbr->kx[1];
for (k = 1; k <= sbr->num_patches; k++)
patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1];
memcpy(sbr->f_tablelim, sbr->f_tablelow,
(sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0]));
if (sbr->num_patches > 1)
memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1,
(sbr->num_patches - 1) * sizeof(patch_borders[0]));
AV_QSORT(sbr->f_tablelim, sbr->num_patches + sbr->n[0],
uint16_t,
qsort_comparison_function_int16);
sbr->n_lim = sbr->n[0] + sbr->num_patches - 1;
while (out < sbr->f_tablelim + sbr->n_lim) {
#if USE_FIXED
if ((*in << 23) >= *out * lim_bands_per_octave_warped) {
#else
if (*in >= *out * lim_bands_per_octave_warped) {
#endif /* USE_FIXED */
*++out = *in++;
} else if (*in == *out ||
!in_table_int16(patch_borders, sbr->num_patches, *in)) {
in++;
sbr->n_lim--;
} else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) {
*out = *in++;
sbr->n_lim--;
} else {
*++out = *in++;
}
}
} else {
sbr->f_tablelim[0] = sbr->f_tablelow[0];
sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]];
sbr->n_lim = 1;
}
}
static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb)
{
unsigned int cnt = get_bits_count(gb);
uint8_t bs_header_extra_1;
uint8_t bs_header_extra_2;
int old_bs_limiter_bands = sbr->bs_limiter_bands;
SpectrumParameters old_spectrum_params;
sbr->start = 1;
sbr->ready_for_dequant = 0;
// Save last spectrum parameters variables to compare to new ones
memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters));
sbr->bs_amp_res_header = get_bits1(gb);
sbr->spectrum_params.bs_start_freq = get_bits(gb, 4);
sbr->spectrum_params.bs_stop_freq = get_bits(gb, 4);
sbr->spectrum_params.bs_xover_band = get_bits(gb, 3);
skip_bits(gb, 2); // bs_reserved
bs_header_extra_1 = get_bits1(gb);
bs_header_extra_2 = get_bits1(gb);
if (bs_header_extra_1) {
sbr->spectrum_params.bs_freq_scale = get_bits(gb, 2);
sbr->spectrum_params.bs_alter_scale = get_bits1(gb);
sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2);
} else {
sbr->spectrum_params.bs_freq_scale = 2;
sbr->spectrum_params.bs_alter_scale = 1;
sbr->spectrum_params.bs_noise_bands = 2;
}
// Check if spectrum parameters changed
if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)))
sbr->reset = 1;
if (bs_header_extra_2) {
sbr->bs_limiter_bands = get_bits(gb, 2);
sbr->bs_limiter_gains = get_bits(gb, 2);
sbr->bs_interpol_freq = get_bits1(gb);
sbr->bs_smoothing_mode = get_bits1(gb);
} else {
sbr->bs_limiter_bands = 2;
sbr->bs_limiter_gains = 2;
sbr->bs_interpol_freq = 1;
sbr->bs_smoothing_mode = 1;
}
if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset)
sbr_make_f_tablelim(sbr);
return get_bits_count(gb) - cnt;
}
static int array_min_int16(const int16_t *array, int nel)
{
int i, min = array[0];
for (i = 1; i < nel; i++)
min = FFMIN(array[i], min);
return min;
}
static int check_n_master(AVCodecContext *avctx, int n_master, int bs_xover_band)
{
// Requirements (14496-3 sp04 p205)
if (n_master <= 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master);
return -1;
}
if (bs_xover_band >= n_master) {
av_log(avctx, AV_LOG_ERROR,
"Invalid bitstream, crossover band index beyond array bounds: %d\n",
bs_xover_band);
return -1;
}
return 0;
}
/// Master Frequency Band Table (14496-3 sp04 p194)
static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,
SpectrumParameters *spectrum)
{
unsigned int temp, max_qmf_subbands = 0;
unsigned int start_min, stop_min;
int k;
const int8_t *sbr_offset_ptr;
int16_t stop_dk[13];
if (sbr->sample_rate < 32000) {
temp = 3000;
} else if (sbr->sample_rate < 64000) {
temp = 4000;
} else
temp = 5000;
switch (sbr->sample_rate) {
case 16000:
sbr_offset_ptr = sbr_offset[0];
break;
case 22050:
sbr_offset_ptr = sbr_offset[1];
break;
case 24000:
sbr_offset_ptr = sbr_offset[2];
break;
case 32000:
sbr_offset_ptr = sbr_offset[3];
break;
case 44100: case 48000: case 64000:
sbr_offset_ptr = sbr_offset[4];
break;
case 88200: case 96000: case 128000: case 176400: case 192000:
sbr_offset_ptr = sbr_offset[5];
break;
default:
av_log(ac->avctx, AV_LOG_ERROR,
"Unsupported sample rate for SBR: %d\n", sbr->sample_rate);
return -1;
}
start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
stop_min = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];
if (spectrum->bs_stop_freq < 14) {
sbr->k[2] = stop_min;
make_bands(stop_dk, stop_min, 64, 13);
AV_QSORT(stop_dk, 13, int16_t, qsort_comparison_function_int16);
for (k = 0; k < spectrum->bs_stop_freq; k++)
sbr->k[2] += stop_dk[k];
} else if (spectrum->bs_stop_freq == 14) {
sbr->k[2] = 2*sbr->k[0];
} else if (spectrum->bs_stop_freq == 15) {
sbr->k[2] = 3*sbr->k[0];
} else {
av_log(ac->avctx, AV_LOG_ERROR,
"Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq);
return -1;
}
sbr->k[2] = FFMIN(64, sbr->k[2]);
// Requirements (14496-3 sp04 p205)
if (sbr->sample_rate <= 32000) {
max_qmf_subbands = 48;
} else if (sbr->sample_rate == 44100) {
max_qmf_subbands = 35;
} else if (sbr->sample_rate >= 48000)
max_qmf_subbands = 32;
else
av_assert0(0);
if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) {
av_log(ac->avctx, AV_LOG_ERROR,
"Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]);
return -1;
}
if (!spectrum->bs_freq_scale) {
int dk, k2diff;
dk = spectrum->bs_alter_scale + 1;
sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1;
if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
return -1;
for (k = 1; k <= sbr->n_master; k++)
sbr->f_master[k] = dk;
k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk;
if (k2diff < 0) {
sbr->f_master[1]--;
sbr->f_master[2]-= (k2diff < -1);
} else if (k2diff) {
sbr->f_master[sbr->n_master]++;
}
sbr->f_master[0] = sbr->k[0];
for (k = 1; k <= sbr->n_master; k++)
sbr->f_master[k] += sbr->f_master[k - 1];
} else {
int half_bands = 7 - spectrum->bs_freq_scale; // bs_freq_scale = {1,2,3}
int two_regions, num_bands_0;
int vdk0_max, vdk1_min;
int16_t vk0[49];
#if USE_FIXED
int tmp, nz = 0;
#endif /* USE_FIXED */
if (49 * sbr->k[2] > 110 * sbr->k[0]) {
two_regions = 1;
sbr->k[1] = 2 * sbr->k[0];
} else {
two_regions = 0;
sbr->k[1] = sbr->k[2];
}
#if USE_FIXED
tmp = (sbr->k[1] << 23) / sbr->k[0];
while (tmp < 0x40000000) {
tmp <<= 1;
nz++;
}
tmp = fixed_log(tmp - 0x80000000);
tmp = (int)(((int64_t)tmp * CONST_RECIP_LN2 + 0x20000000) >> 30);
tmp = (((tmp + 0x80) >> 8) + ((8 - nz) << 23)) * half_bands;
num_bands_0 = ((tmp + 0x400000) >> 23) * 2;
#else
num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2;
#endif /* USE_FIXED */
if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205)
av_log(ac->avctx, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0);
return -1;
}
vk0[0] = 0;
make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0);
AV_QSORT(vk0 + 1, num_bands_0, int16_t, qsort_comparison_function_int16);
vdk0_max = vk0[num_bands_0];
vk0[0] = sbr->k[0];
for (k = 1; k <= num_bands_0; k++) {
if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205)
av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]);
return -1;
}
vk0[k] += vk0[k-1];
}
if (two_regions) {
int16_t vk1[49];
#if USE_FIXED
int num_bands_1;
tmp = (sbr->k[2] << 23) / sbr->k[1];
nz = 0;
while (tmp < 0x40000000) {
tmp <<= 1;
nz++;
}
tmp = fixed_log(tmp - 0x80000000);
tmp = (int)(((int64_t)tmp * CONST_RECIP_LN2 + 0x20000000) >> 30);
tmp = (((tmp + 0x80) >> 8) + ((8 - nz) << 23)) * half_bands;
if (spectrum->bs_alter_scale)
tmp = (int)(((int64_t)tmp * CONST_076923 + 0x40000000) >> 31);
num_bands_1 = ((tmp + 0x400000) >> 23) * 2;
#else
float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f
: 1.0f; // bs_alter_scale = {0,1}
int num_bands_1 = lrintf(half_bands * invwarp *
log2f(sbr->k[2] / (float)sbr->k[1])) * 2;
#endif /* USE_FIXED */
make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1);
vdk1_min = array_min_int16(vk1 + 1, num_bands_1);
if (vdk1_min < vdk0_max) {
int change;
AV_QSORT(vk1 + 1, num_bands_1, int16_t, qsort_comparison_function_int16);
change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1);
vk1[1] += change;
vk1[num_bands_1] -= change;
}
AV_QSORT(vk1 + 1, num_bands_1, int16_t, qsort_comparison_function_int16);
vk1[0] = sbr->k[1];
for (k = 1; k <= num_bands_1; k++) {
if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205)
av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]);
return -1;
}
vk1[k] += vk1[k-1];
}
sbr->n_master = num_bands_0 + num_bands_1;
if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
return -1;
memcpy(&sbr->f_master[0], vk0,
(num_bands_0 + 1) * sizeof(sbr->f_master[0]));
memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1,
num_bands_1 * sizeof(sbr->f_master[0]));
} else {
sbr->n_master = num_bands_0;
if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
return -1;
memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
}
}
return 0;
}
/// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)
static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr)
{
int i, k, last_k = -1, last_msb = -1, sb = 0;
int msb = sbr->k[0];
int usb = sbr->kx[1];
int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
sbr->num_patches = 0;
if (goal_sb < sbr->kx[1] + sbr->m[1]) {
for (k = 0; sbr->f_master[k] < goal_sb; k++) ;
} else
k = sbr->n_master;
do {
int odd = 0;
if (k == last_k && msb == last_msb) {
av_log(ac->avctx, AV_LOG_ERROR, "patch construction failed\n");
return AVERROR_INVALIDDATA;
}
last_k = k;
last_msb = msb;
for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) {
sb = sbr->f_master[i];
odd = (sb + sbr->k[0]) & 1;
}
// Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5.
// After this check the final number of patches can still be six which is
// illegal however the Coding Technologies decoder check stream has a final
// count of 6 patches
if (sbr->num_patches > 5) {
av_log(ac->avctx, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches);
return -1;
}
sbr->patch_num_subbands[sbr->num_patches] = FFMAX(sb - usb, 0);
sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches];
if (sbr->patch_num_subbands[sbr->num_patches] > 0) {
usb = sb;
msb = sb;
sbr->num_patches++;
} else
msb = sbr->kx[1];
if (sbr->f_master[k] - sb < 3)
k = sbr->n_master;
} while (sb != sbr->kx[1] + sbr->m[1]);
if (sbr->num_patches > 1 &&
sbr->patch_num_subbands[sbr->num_patches - 1] < 3)
sbr->num_patches--;
return 0;
}
/// Derived Frequency Band Tables (14496-3 sp04 p197)
static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr)
{
int k, temp;
#if USE_FIXED
int nz = 0;
#endif /* USE_FIXED */
sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band;
sbr->n[0] = (sbr->n[1] + 1) >> 1;
memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band],
(sbr->n[1] + 1) * sizeof(sbr->f_master[0]));
sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0];
sbr->kx[1] = sbr->f_tablehigh[0];
// Requirements (14496-3 sp04 p205)
if (sbr->kx[1] + sbr->m[1] > 64) {
av_log(ac->avctx, AV_LOG_ERROR,
"Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]);
return -1;
}
if (sbr->kx[1] > 32) {
av_log(ac->avctx, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]);
return -1;
}
sbr->f_tablelow[0] = sbr->f_tablehigh[0];
temp = sbr->n[1] & 1;
for (k = 1; k <= sbr->n[0]; k++)
sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp];
#if USE_FIXED
temp = (sbr->k[2] << 23) / sbr->kx[1];
while (temp < 0x40000000) {
temp <<= 1;
nz++;
}
temp = fixed_log(temp - 0x80000000);
temp = (int)(((int64_t)temp * CONST_RECIP_LN2 + 0x20000000) >> 30);
temp = (((temp + 0x80) >> 8) + ((8 - nz) << 23)) * sbr->spectrum_params.bs_noise_bands;
sbr->n_q = (temp + 0x400000) >> 23;
if (sbr->n_q < 1)
sbr->n_q = 1;
#else
sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands *
log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3
#endif /* USE_FIXED */
if (sbr->n_q > 5) {
av_log(ac->avctx, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q);
return -1;
}
sbr->f_tablenoise[0] = sbr->f_tablelow[0];
temp = 0;
for (k = 1; k <= sbr->n_q; k++) {
temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k);
sbr->f_tablenoise[k] = sbr->f_tablelow[temp];
}
if (sbr_hf_calc_npatches(ac, sbr) < 0)
return -1;
sbr_make_f_tablelim(sbr);
sbr->data[0].f_indexnoise = 0;
sbr->data[1].f_indexnoise = 0;
return 0;
}
static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec,
int elements)
{
int i;
for (i = 0; i < elements; i++) {
vec[i] = get_bits1(gb);
}
}
/** ceil(log2(index+1)) */
static const int8_t ceil_log2[] = {
0, 1, 2, 2, 3, 3,
};
static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
GetBitContext *gb, SBRData *ch_data)
{
int i;
int bs_pointer = 0;
// frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots
int abs_bord_trail = 16;
int num_rel_lead, num_rel_trail;
unsigned bs_num_env_old = ch_data->bs_num_env;
ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env];
ch_data->bs_amp_res = sbr->bs_amp_res_header;
ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old];
switch (ch_data->bs_frame_class = get_bits(gb, 2)) {
case FIXFIX:
ch_data->bs_num_env = 1 << get_bits(gb, 2);
num_rel_lead = ch_data->bs_num_env - 1;
if (ch_data->bs_num_env == 1)
ch_data->bs_amp_res = 0;
if (ch_data->bs_num_env > 4) {
av_log(ac->avctx, AV_LOG_ERROR,
"Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",
ch_data->bs_num_env);
return -1;
}
ch_data->t_env[0] = 0;
ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
abs_bord_trail = (abs_bord_trail + (ch_data->bs_num_env >> 1)) /
ch_data->bs_num_env;
for (i = 0; i < num_rel_lead; i++)
ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail;
ch_data->bs_freq_res[1] = get_bits1(gb);
for (i = 1; i < ch_data->bs_num_env; i++)
ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];
break;
case FIXVAR:
abs_bord_trail += get_bits(gb, 2);
num_rel_trail = get_bits(gb, 2);
ch_data->bs_num_env = num_rel_trail + 1;
ch_data->t_env[0] = 0;
ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
for (i = 0; i < num_rel_trail; i++)
ch_data->t_env[ch_data->bs_num_env - 1 - i] =
ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
for (i = 0; i < ch_data->bs_num_env; i++)
ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb);
break;
case VARFIX:
ch_data->t_env[0] = get_bits(gb, 2);
num_rel_lead = get_bits(gb, 2);
ch_data->bs_num_env = num_rel_lead + 1;
ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
for (i = 0; i < num_rel_lead; i++)
ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
break;
case VARVAR:
ch_data->t_env[0] = get_bits(gb, 2);
abs_bord_trail += get_bits(gb, 2);
num_rel_lead = get_bits(gb, 2);
num_rel_trail = get_bits(gb, 2);
ch_data->bs_num_env = num_rel_lead + num_rel_trail + 1;
if (ch_data->bs_num_env > 5) {
av_log(ac->avctx, AV_LOG_ERROR,
"Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",
ch_data->bs_num_env);
return -1;
}
ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
for (i = 0; i < num_rel_lead; i++)
ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
for (i = 0; i < num_rel_trail; i++)
ch_data->t_env[ch_data->bs_num_env - 1 - i] =
ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
break;
}
av_assert0(bs_pointer >= 0);
if (bs_pointer > ch_data->bs_num_env + 1) {
av_log(ac->avctx, AV_LOG_ERROR,
"Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n",
bs_pointer);
return -1;
}
for (i = 1; i <= ch_data->bs_num_env; i++) {
if (ch_data->t_env[i-1] >= ch_data->t_env[i]) {
av_log(ac->avctx, AV_LOG_ERROR, "Not strictly monotone time borders\n");
return -1;
}
}
ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1;
ch_data->t_q[0] = ch_data->t_env[0];
ch_data->t_q[ch_data->bs_num_noise] = ch_data->t_env[ch_data->bs_num_env];
if (ch_data->bs_num_noise > 1) {
int idx;
if (ch_data->bs_frame_class == FIXFIX) {
idx = ch_data->bs_num_env >> 1;
} else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
idx = ch_data->bs_num_env - FFMAX(bs_pointer - 1, 1);
} else { // VARFIX
if (!bs_pointer)
idx = 1;
else if (bs_pointer == 1)
idx = ch_data->bs_num_env - 1;
else // bs_pointer > 1
idx = bs_pointer - 1;
}
ch_data->t_q[1] = ch_data->t_env[idx];
}
ch_data->e_a[0] = -(ch_data->e_a[1] != bs_num_env_old); // l_APrev
ch_data->e_a[1] = -1;
if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0
ch_data->e_a[1] = ch_data->bs_num_env + 1 - bs_pointer;
} else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1
ch_data->e_a[1] = bs_pointer - 1;
return 0;
}
static void copy_sbr_grid(SBRData *dst, const SBRData *src) {
//These variables are saved from the previous frame rather than copied
dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env];
dst->t_env_num_env_old = dst->t_env[dst->bs_num_env];
dst->e_a[0] = -(dst->e_a[1] != dst->bs_num_env);
//These variables are read from the bitstream and therefore copied
memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res));
memcpy(dst->t_env, src->t_env, sizeof(dst->t_env));
memcpy(dst->t_q, src->t_q, sizeof(dst->t_q));
dst->bs_num_env = src->bs_num_env;
dst->bs_amp_res = src->bs_amp_res;
dst->bs_num_noise = src->bs_num_noise;
dst->bs_frame_class = src->bs_frame_class;
dst->e_a[1] = src->e_a[1];
}
/// Read how the envelope and noise floor data is delta coded
static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb,
SBRData *ch_data)
{
get_bits1_vector(gb, ch_data->bs_df_env, ch_data->bs_num_env);
get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise);
}
/// Read inverse filtering data
static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb,
SBRData *ch_data)
{
int i;
memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t));
for (i = 0; i < sbr->n_q; i++)
ch_data->bs_invf_mode[0][i] = get_bits(gb, 2);
}
static int read_sbr_envelope(AACContext *ac, SpectralBandReplication *sbr, GetBitContext *gb,
SBRData *ch_data, int ch)
{
int bits;
int i, j, k;
VLC_TYPE (*t_huff)[2], (*f_huff)[2];
int t_lav, f_lav;
const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
const int odd = sbr->n[1] & 1;
if (sbr->bs_coupling && ch) {
if (ch_data->bs_amp_res) {
bits = 5;
t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;
t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];
f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
} else {
bits = 6;
t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;
t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];
f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;
f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];
}
} else {
if (ch_data->bs_amp_res) {
bits = 6;
t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;
t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];
f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
} else {
bits = 7;
t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;
t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];
f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;
f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];
}
}
for (i = 0; i < ch_data->bs_num_env; i++) {
if (ch_data->bs_df_env[i]) {
// bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame
if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {
for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
ch_data->env_facs_q[i + 1][j] = ch_data->env_facs_q[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
if (ch_data->env_facs_q[i + 1][j] > 127U) {
av_log(ac->avctx, AV_LOG_ERROR, "env_facs_q %d is invalid\n", ch_data->env_facs_q[i + 1][j]);
return AVERROR_INVALIDDATA;
}
}
} else if (ch_data->bs_freq_res[i + 1]) {
for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]
ch_data->env_facs_q[i + 1][j] = ch_data->env_facs_q[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
if (ch_data->env_facs_q[i + 1][j] > 127U) {
av_log(ac->avctx, AV_LOG_ERROR, "env_facs_q %d is invalid\n", ch_data->env_facs_q[i + 1][j]);
return AVERROR_INVALIDDATA;
}
}
} else {
for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]
ch_data->env_facs_q[i + 1][j] = ch_data->env_facs_q[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
if (ch_data->env_facs_q[i + 1][j] > 127U) {
av_log(ac->avctx, AV_LOG_ERROR, "env_facs_q %d is invalid\n", ch_data->env_facs_q[i + 1][j]);
return AVERROR_INVALIDDATA;
}
}
}
} else {
ch_data->env_facs_q[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance
for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
ch_data->env_facs_q[i + 1][j] = ch_data->env_facs_q[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);
if (ch_data->env_facs_q[i + 1][j] > 127U) {
av_log(ac->avctx, AV_LOG_ERROR, "env_facs_q %d is invalid\n", ch_data->env_facs_q[i + 1][j]);
return AVERROR_INVALIDDATA;
}
}
}
}
//assign 0th elements of env_facs_q from last elements
memcpy(ch_data->env_facs_q[0], ch_data->env_facs_q[ch_data->bs_num_env],
sizeof(ch_data->env_facs_q[0]));
return 0;
}
static int read_sbr_noise(AACContext *ac, SpectralBandReplication *sbr, GetBitContext *gb,
SBRData *ch_data, int ch)
{
int i, j;
VLC_TYPE (*t_huff)[2], (*f_huff)[2];
int t_lav, f_lav;
int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
if (sbr->bs_coupling && ch) {
t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;
t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];
f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
} else {
t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;
t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];
f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
}
for (i = 0; i < ch_data->bs_num_noise; i++) {
if (ch_data->bs_df_noise[i]) {
for (j = 0; j < sbr->n_q; j++) {
ch_data->noise_facs_q[i + 1][j] = ch_data->noise_facs_q[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav);
if (ch_data->noise_facs_q[i + 1][j] > 30U) {
av_log(ac->avctx, AV_LOG_ERROR, "noise_facs_q %d is invalid\n", ch_data->noise_facs_q[i + 1][j]);
return AVERROR_INVALIDDATA;
}
}
} else {
ch_data->noise_facs_q[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level
for (j = 1; j < sbr->n_q; j++) {
ch_data->noise_facs_q[i + 1][j] = ch_data->noise_facs_q[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);
if (ch_data->noise_facs_q[i + 1][j] > 30U) {
av_log(ac->avctx, AV_LOG_ERROR, "noise_facs_q %d is invalid\n", ch_data->noise_facs_q[i + 1][j]);
return AVERROR_INVALIDDATA;
}
}
}
}
//assign 0th elements of noise_facs_q from last elements
memcpy(ch_data->noise_facs_q[0], ch_data->noise_facs_q[ch_data->bs_num_noise],
sizeof(ch_data->noise_facs_q[0]));
return 0;
}
static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
GetBitContext *gb,
int bs_extension_id, int *num_bits_left)
{
switch (bs_extension_id) {
case EXTENSION_ID_PS:
if (!ac->oc[1].m4ac.ps) {
av_log(ac->avctx, AV_LOG_ERROR, "Parametric Stereo signaled to be not-present but was found in the bitstream.\n");
skip_bits_long(gb, *num_bits_left); // bs_fill_bits
*num_bits_left = 0;
} else {
#if 1
*num_bits_left -= AAC_RENAME(ff_ps_read_data)(ac->avctx, gb, &sbr->ps, *num_bits_left);
ac->avctx->profile = FF_PROFILE_AAC_HE_V2;
#else
avpriv_report_missing_feature(ac->avctx, "Parametric Stereo");
skip_bits_long(gb, *num_bits_left); // bs_fill_bits
*num_bits_left = 0;
#endif
}
break;
default:
// some files contain 0-padding
if (bs_extension_id || *num_bits_left > 16 || show_bits(gb, *num_bits_left))
avpriv_request_sample(ac->avctx, "Reserved SBR extensions");
skip_bits_long(gb, *num_bits_left); // bs_fill_bits
*num_bits_left = 0;
break;
}
}
static int read_sbr_single_channel_element(AACContext *ac,
SpectralBandReplication *sbr,
GetBitContext *gb)
{
int ret;
if (get_bits1(gb)) // bs_data_extra
skip_bits(gb, 4); // bs_reserved
if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
return -1;
read_sbr_dtdf(sbr, gb, &sbr->data[0]);
read_sbr_invf(sbr, gb, &sbr->data[0]);
if((ret = read_sbr_envelope(ac, sbr, gb, &sbr->data[0], 0)) < 0)
return ret;
if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[0], 0)) < 0)
return ret;
if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
return 0;
}
static int read_sbr_channel_pair_element(AACContext *ac,
SpectralBandReplication *sbr,
GetBitContext *gb)
{
int ret;
if (get_bits1(gb)) // bs_data_extra
skip_bits(gb, 8); // bs_reserved
if ((sbr->bs_coupling = get_bits1(gb))) {
if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
return -1;
copy_sbr_grid(&sbr->data[1], &sbr->data[0]);
read_sbr_dtdf(sbr, gb, &sbr->data[0]);
read_sbr_dtdf(sbr, gb, &sbr->data[1]);
read_sbr_invf(sbr, gb, &sbr->data[0]);
memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
if((ret = read_sbr_envelope(ac, sbr, gb, &sbr->data[0], 0)) < 0)
return ret;
if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[0], 0)) < 0)
return ret;
if((ret = read_sbr_envelope(ac, sbr, gb, &sbr->data[1], 1)) < 0)
return ret;
if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[1], 1)) < 0)
return ret;
} else {
if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) ||
read_sbr_grid(ac, sbr, gb, &sbr->data[1]))
return -1;
read_sbr_dtdf(sbr, gb, &sbr->data[0]);
read_sbr_dtdf(sbr, gb, &sbr->data[1]);
read_sbr_invf(sbr, gb, &sbr->data[0]);
read_sbr_invf(sbr, gb, &sbr->data[1]);
if((ret = read_sbr_envelope(ac, sbr, gb, &sbr->data[0], 0)) < 0)
return ret;
if((ret = read_sbr_envelope(ac, sbr, gb, &sbr->data[1], 1)) < 0)
return ret;
if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[0], 0)) < 0)
return ret;
if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[1], 1)) < 0)
return ret;
}
if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))
get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);
return 0;
}
static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,
GetBitContext *gb, int id_aac)
{
unsigned int cnt = get_bits_count(gb);
sbr->id_aac = id_aac;
sbr->ready_for_dequant = 1;
if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {
if (read_sbr_single_channel_element(ac, sbr, gb)) {
sbr_turnoff(sbr);
return get_bits_count(gb) - cnt;
}
} else if (id_aac == TYPE_CPE) {
if (read_sbr_channel_pair_element(ac, sbr, gb)) {
sbr_turnoff(sbr);
return get_bits_count(gb) - cnt;
}
} else {
av_log(ac->avctx, AV_LOG_ERROR,
"Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);
sbr_turnoff(sbr);
return get_bits_count(gb) - cnt;
}
if (get_bits1(gb)) { // bs_extended_data
int num_bits_left = get_bits(gb, 4); // bs_extension_size
if (num_bits_left == 15)
num_bits_left += get_bits(gb, 8); // bs_esc_count
num_bits_left <<= 3;
while (num_bits_left > 7) {
num_bits_left -= 2;
read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id
}
if (num_bits_left < 0) {
av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n");
}
if (num_bits_left > 0)
skip_bits(gb, num_bits_left);
}
return get_bits_count(gb) - cnt;
}
static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr)
{
int err;
err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);
if (err >= 0)
err = sbr_make_f_derived(ac, sbr);
if (err < 0) {
av_log(ac->avctx, AV_LOG_ERROR,
"SBR reset failed. Switching SBR to pure upsampling mode.\n");
sbr_turnoff(sbr);
}
}
/**
* Decode Spectral Band Replication extension data; reference: table 4.55.
*
* @param crc flag indicating the presence of CRC checksum
* @param cnt length of TYPE_FIL syntactic element in bytes
*
* @return Returns number of bytes consumed from the TYPE_FIL element.
*/
int AAC_RENAME(ff_decode_sbr_extension)(AACContext *ac, SpectralBandReplication *sbr,
GetBitContext *gb_host, int crc, int cnt, int id_aac)
{
unsigned int num_sbr_bits = 0, num_align_bits;
unsigned bytes_read;
GetBitContext gbc = *gb_host, *gb = &gbc;
skip_bits_long(gb_host, cnt*8 - 4);
sbr->reset = 0;
if (!sbr->sample_rate)
sbr->sample_rate = 2 * ac->oc[1].m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support
if (!ac->oc[1].m4ac.ext_sample_rate)
ac->oc[1].m4ac.ext_sample_rate = 2 * ac->oc[1].m4ac.sample_rate;
if (crc) {
skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check
num_sbr_bits += 10;
}
//Save some state from the previous frame.
sbr->kx[0] = sbr->kx[1];
sbr->m[0] = sbr->m[1];
sbr->kx_and_m_pushed = 1;
num_sbr_bits++;
if (get_bits1(gb)) // bs_header_flag
num_sbr_bits += read_sbr_header(sbr, gb);
if (sbr->reset)
sbr_reset(ac, sbr);
if (sbr->start)
num_sbr_bits += read_sbr_data(ac, sbr, gb, id_aac);
num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;
bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);
if (bytes_read > cnt) {
av_log(ac->avctx, AV_LOG_ERROR,
"Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);
}
return cnt;
}
/**
* Analysis QMF Bank (14496-3 sp04 p206)
*
* @param x pointer to the beginning of the first sample window
* @param W array of complex-valued samples split into subbands
*/
#ifndef sbr_qmf_analysis
#if USE_FIXED
static void sbr_qmf_analysis(AVFixedDSPContext *dsp, FFTContext *mdct,
#else
static void sbr_qmf_analysis(AVFloatDSPContext *dsp, FFTContext *mdct,
#endif /* USE_FIXED */
SBRDSPContext *sbrdsp, const INTFLOAT *in, INTFLOAT *x,
INTFLOAT z[320], INTFLOAT W[2][32][32][2], int buf_idx)
{
int i;
#if USE_FIXED
int j;
#endif
memcpy(x , x+1024, (320-32)*sizeof(x[0]));
memcpy(x+288, in, 1024*sizeof(x[0]));
for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames
// are not supported
dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);
sbrdsp->sum64x5(z);
sbrdsp->qmf_pre_shuffle(z);
#if USE_FIXED
for (j = 64; j < 128; j++) {
if (z[j] > 1<<24) {
av_log(NULL, AV_LOG_WARNING,
"sbr_qmf_analysis: value %09d too large, setting to %09d\n",
z[j], 1<<24);
z[j] = 1<<24;
} else if (z[j] < -(1<<24)) {
av_log(NULL, AV_LOG_WARNING,
"sbr_qmf_analysis: value %09d too small, setting to %09d\n",
z[j], -(1<<24));
z[j] = -(1<<24);
}
}
#endif
mdct->imdct_half(mdct, z, z+64);
sbrdsp->qmf_post_shuffle(W[buf_idx][i], z);
x += 32;
}
}
#endif
/**
* Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank
* (14496-3 sp04 p206)
*/
#ifndef sbr_qmf_synthesis
static void sbr_qmf_synthesis(FFTContext *mdct,
#if USE_FIXED
SBRDSPContext *sbrdsp, AVFixedDSPContext *dsp,
#else
SBRDSPContext *sbrdsp, AVFloatDSPContext *dsp,
#endif /* USE_FIXED */
INTFLOAT *out, INTFLOAT X[2][38][64],
INTFLOAT mdct_buf[2][64],
INTFLOAT *v0, int *v_off, const unsigned int div)
{
int i, n;
const INTFLOAT *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;
const int step = 128 >> div;
INTFLOAT *v;
for (i = 0; i < 32; i++) {
if (*v_off < step) {
int saved_samples = (1280 - 128) >> div;
memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(INTFLOAT));
*v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step;
} else {
*v_off -= step;
}
v = v0 + *v_off;
if (div) {
for (n = 0; n < 32; n++) {
X[0][i][ n] = -X[0][i][n];
X[0][i][32+n] = X[1][i][31-n];
}
mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
sbrdsp->qmf_deint_neg(v, mdct_buf[0]);
} else {
sbrdsp->neg_odd_64(X[1][i]);
mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
mdct->imdct_half(mdct, mdct_buf[1], X[1][i]);
sbrdsp->qmf_deint_bfly(v, mdct_buf[1], mdct_buf[0]);
}
dsp->vector_fmul (out, v , sbr_qmf_window , 64 >> div);
dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out , 64 >> div);
dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out , 64 >> div);
dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out , 64 >> div);
dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out , 64 >> div);
dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out , 64 >> div);
dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out , 64 >> div);
dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out , 64 >> div);
dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out , 64 >> div);
dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out , 64 >> div);
out += 64 >> div;
}
}
#endif
/// Generate the subband filtered lowband
static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr,
INTFLOAT X_low[32][40][2], const INTFLOAT W[2][32][32][2],
int buf_idx)
{
int i, k;
const int t_HFGen = 8;
const int i_f = 32;
memset(X_low, 0, 32*sizeof(*X_low));
for (k = 0; k < sbr->kx[1]; k++) {
for (i = t_HFGen; i < i_f + t_HFGen; i++) {
X_low[k][i][0] = W[buf_idx][i - t_HFGen][k][0];
X_low[k][i][1] = W[buf_idx][i - t_HFGen][k][1];
}
}
buf_idx = 1-buf_idx;
for (k = 0; k < sbr->kx[0]; k++) {
for (i = 0; i < t_HFGen; i++) {
X_low[k][i][0] = W[buf_idx][i + i_f - t_HFGen][k][0];
X_low[k][i][1] = W[buf_idx][i + i_f - t_HFGen][k][1];
}
}
return 0;
}
/// High Frequency Generator (14496-3 sp04 p215)
static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr,
INTFLOAT X_high[64][40][2], const INTFLOAT X_low[32][40][2],
const INTFLOAT (*alpha0)[2], const INTFLOAT (*alpha1)[2],
const INTFLOAT bw_array[5], const uint8_t *t_env,
int bs_num_env)
{
int j, x;
int g = 0;
int k = sbr->kx[1];
for (j = 0; j < sbr->num_patches; j++) {
for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) {
const int p = sbr->patch_start_subband[j] + x;
while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])
g++;
g--;
if (g < 0) {
av_log(ac->avctx, AV_LOG_ERROR,
"ERROR : no subband found for frequency %d\n", k);
return -1;
}
sbr->dsp.hf_gen(X_high[k] + ENVELOPE_ADJUSTMENT_OFFSET,
X_low[p] + ENVELOPE_ADJUSTMENT_OFFSET,
alpha0[p], alpha1[p], bw_array[g],
2 * t_env[0], 2 * t_env[bs_num_env]);
}
}
if (k < sbr->m[1] + sbr->kx[1])
memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));
return 0;
}
/// Generate the subband filtered lowband
static int sbr_x_gen(SpectralBandReplication *sbr, INTFLOAT X[2][38][64],
const INTFLOAT Y0[38][64][2], const INTFLOAT Y1[38][64][2],
const INTFLOAT X_low[32][40][2], int ch)
{
int k, i;
const int i_f = 32;
const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);
memset(X, 0, 2*sizeof(*X));
for (k = 0; k < sbr->kx[0]; k++) {
for (i = 0; i < i_Temp; i++) {
X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
}
}
for (; k < sbr->kx[0] + sbr->m[0]; k++) {
for (i = 0; i < i_Temp; i++) {
X[0][i][k] = Y0[i + i_f][k][0];
X[1][i][k] = Y0[i + i_f][k][1];
}
}
for (k = 0; k < sbr->kx[1]; k++) {
for (i = i_Temp; i < 38; i++) {
X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
}
}
for (; k < sbr->kx[1] + sbr->m[1]; k++) {
for (i = i_Temp; i < i_f; i++) {
X[0][i][k] = Y1[i][k][0];
X[1][i][k] = Y1[i][k][1];
}
}
return 0;
}
/** High Frequency Adjustment (14496-3 sp04 p217) and Mapping
* (14496-3 sp04 p217)
*/
static int sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,
SBRData *ch_data, int e_a[2])
{
int e, i, m;
memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));
for (e = 0; e < ch_data->bs_num_env; e++) {
const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];
uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
int k;
if (sbr->kx[1] != table[0]) {
av_log(ac->avctx, AV_LOG_ERROR, "kx != f_table{high,low}[0]. "
"Derived frequency tables were not regenerated.\n");
sbr_turnoff(sbr);
return AVERROR_BUG;
}
for (i = 0; i < ilim; i++)
for (m = table[i]; m < table[i + 1]; m++)
sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];
// ch_data->bs_num_noise > 1 => 2 noise floors
k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);
for (i = 0; i < sbr->n_q; i++)
for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)
sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];
for (i = 0; i < sbr->n[1]; i++) {
if (ch_data->bs_add_harmonic_flag) {
const unsigned int m_midpoint =
(sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;
ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *
(e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));
}
}
for (i = 0; i < ilim; i++) {
int additional_sinusoid_present = 0;
for (m = table[i]; m < table[i + 1]; m++) {
if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {
additional_sinusoid_present = 1;
break;
}
}
memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,
(table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));
}
}
memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0]));
return 0;
}
/// Estimation of current envelope (14496-3 sp04 p218)
static void sbr_env_estimate(AAC_FLOAT (*e_curr)[48], INTFLOAT X_high[64][40][2],
SpectralBandReplication *sbr, SBRData *ch_data)
{
int e, m;
int kx1 = sbr->kx[1];
if (sbr->bs_interpol_freq) {
for (e = 0; e < ch_data->bs_num_env; e++) {
#if USE_FIXED
const SoftFloat recip_env_size = av_int2sf(0x20000000 / (ch_data->t_env[e + 1] - ch_data->t_env[e]), 30);
#else
const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]);
#endif /* USE_FIXED */
int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
for (m = 0; m < sbr->m[1]; m++) {
AAC_FLOAT sum = sbr->dsp.sum_square(X_high[m+kx1] + ilb, iub - ilb);
#if USE_FIXED
e_curr[e][m] = av_mul_sf(sum, recip_env_size);
#else
e_curr[e][m] = sum * recip_env_size;
#endif /* USE_FIXED */
}
}
} else {
int k, p;
for (e = 0; e < ch_data->bs_num_env; e++) {
const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);
int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {
#if USE_FIXED
SoftFloat sum = FLOAT_0;
const SoftFloat den = av_int2sf(0x20000000 / (env_size * (table[p + 1] - table[p])), 29);
for (k = table[p]; k < table[p + 1]; k++) {
sum = av_add_sf(sum, sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb));
}
sum = av_mul_sf(sum, den);
#else
float sum = 0.0f;
const int den = env_size * (table[p + 1] - table[p]);
for (k = table[p]; k < table[p + 1]; k++) {
sum += sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb);
}
sum /= den;
#endif /* USE_FIXED */
for (k = table[p]; k < table[p + 1]; k++) {
e_curr[e][k - kx1] = sum;
}
}
}
}
}
void AAC_RENAME(ff_sbr_apply)(AACContext *ac, SpectralBandReplication *sbr, int id_aac,
INTFLOAT* L, INTFLOAT* R)
{
int downsampled = ac->oc[1].m4ac.ext_sample_rate < sbr->sample_rate;
int ch;
int nch = (id_aac == TYPE_CPE) ? 2 : 1;
int err;
if (id_aac != sbr->id_aac) {
av_log(ac->avctx, id_aac == TYPE_LFE ? AV_LOG_VERBOSE : AV_LOG_WARNING,
"element type mismatch %d != %d\n", id_aac, sbr->id_aac);
sbr_turnoff(sbr);
}
if (sbr->start && !sbr->ready_for_dequant) {
av_log(ac->avctx, AV_LOG_ERROR,
"No quantized data read for sbr_dequant.\n");
sbr_turnoff(sbr);
}
if (!sbr->kx_and_m_pushed) {
sbr->kx[0] = sbr->kx[1];
sbr->m[0] = sbr->m[1];
} else {
sbr->kx_and_m_pushed = 0;
}
if (sbr->start) {
sbr_dequant(sbr, id_aac);
sbr->ready_for_dequant = 0;
}
for (ch = 0; ch < nch; ch++) {
/* decode channel */
sbr_qmf_analysis(ac->fdsp, &sbr->mdct_ana, &sbr->dsp, ch ? R : L, sbr->data[ch].analysis_filterbank_samples,
(INTFLOAT*)sbr->qmf_filter_scratch,
sbr->data[ch].W, sbr->data[ch].Ypos);
sbr->c.sbr_lf_gen(ac, sbr, sbr->X_low,
(const INTFLOAT (*)[32][32][2]) sbr->data[ch].W,
sbr->data[ch].Ypos);
sbr->data[ch].Ypos ^= 1;
if (sbr->start) {
sbr->c.sbr_hf_inverse_filter(&sbr->dsp, sbr->alpha0, sbr->alpha1,
(const INTFLOAT (*)[40][2]) sbr->X_low, sbr->k[0]);
sbr_chirp(sbr, &sbr->data[ch]);
av_assert0(sbr->data[ch].bs_num_env > 0);
sbr_hf_gen(ac, sbr, sbr->X_high,
(const INTFLOAT (*)[40][2]) sbr->X_low,
(const INTFLOAT (*)[2]) sbr->alpha0,
(const INTFLOAT (*)[2]) sbr->alpha1,
sbr->data[ch].bw_array, sbr->data[ch].t_env,
sbr->data[ch].bs_num_env);
// hf_adj
err = sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
if (!err) {
sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);
sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
sbr->c.sbr_hf_assemble(sbr->data[ch].Y[sbr->data[ch].Ypos],
(const INTFLOAT (*)[40][2]) sbr->X_high,
sbr, &sbr->data[ch],
sbr->data[ch].e_a);
}
}
/* synthesis */
sbr->c.sbr_x_gen(sbr, sbr->X[ch],
(const INTFLOAT (*)[64][2]) sbr->data[ch].Y[1-sbr->data[ch].Ypos],
(const INTFLOAT (*)[64][2]) sbr->data[ch].Y[ sbr->data[ch].Ypos],
(const INTFLOAT (*)[40][2]) sbr->X_low, ch);
}
if (ac->oc[1].m4ac.ps == 1) {
if (sbr->ps.start) {
AAC_RENAME(ff_ps_apply)(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]);
} else {
memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0]));
}
nch = 2;
}
sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, ac->fdsp,
L, sbr->X[0], sbr->qmf_filter_scratch,
sbr->data[0].synthesis_filterbank_samples,
&sbr->data[0].synthesis_filterbank_samples_offset,
downsampled);
if (nch == 2)
sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, ac->fdsp,
R, sbr->X[1], sbr->qmf_filter_scratch,
sbr->data[1].synthesis_filterbank_samples,
&sbr->data[1].synthesis_filterbank_samples_offset,
downsampled);
}
static void aacsbr_func_ptr_init(AACSBRContext *c)
{
c->sbr_lf_gen = sbr_lf_gen;
c->sbr_hf_assemble = sbr_hf_assemble;
c->sbr_x_gen = sbr_x_gen;
c->sbr_hf_inverse_filter = sbr_hf_inverse_filter;
#if !USE_FIXED
if(ARCH_MIPS)
ff_aacsbr_func_ptr_init_mips(c);
#endif
}
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