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ac3dec.c
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ac3dec.c
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/*
* AC-3 Audio Decoder
* This code was developed as part of Google Summer of Code 2006.
* E-AC-3 support was added as part of Google Summer of Code 2007.
*
* Copyright (c) 2006 Kartikey Mahendra BHATT (bhattkm at gmail dot com)
* Copyright (c) 2007-2008 Bartlomiej Wolowiec <[email protected]>
* Copyright (c) 2007 Justin Ruggles <[email protected]>
*
* 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
*/
#include <stdio.h>
#include <stddef.h>
#include <math.h>
#include <string.h>
#include "libavutil/channel_layout.h"
#include "libavutil/crc.h"
#include "libavutil/downmix_info.h"
#include "libavutil/opt.h"
#include "bswapdsp.h"
#include "internal.h"
#include "aac_ac3_parser.h"
#include "ac3_parser_internal.h"
#include "ac3dec.h"
#include "ac3dec_data.h"
#include "kbdwin.h"
/**
* table for ungrouping 3 values in 7 bits.
* used for exponents and bap=2 mantissas
*/
static uint8_t ungroup_3_in_7_bits_tab[128][3];
/** tables for ungrouping mantissas */
static int b1_mantissas[32][3];
static int b2_mantissas[128][3];
static int b3_mantissas[8];
static int b4_mantissas[128][2];
static int b5_mantissas[16];
/**
* Quantization table: levels for symmetric. bits for asymmetric.
* reference: Table 7.18 Mapping of bap to Quantizer
*/
static const uint8_t quantization_tab[16] = {
0, 3, 5, 7, 11, 15,
5, 6, 7, 8, 9, 10, 11, 12, 14, 16
};
#if (!USE_FIXED)
/** dynamic range table. converts codes to scale factors. */
static float dynamic_range_tab[256];
float ff_ac3_heavy_dynamic_range_tab[256];
#endif
/** Adjustments in dB gain */
static const float gain_levels[9] = {
LEVEL_PLUS_3DB,
LEVEL_PLUS_1POINT5DB,
LEVEL_ONE,
LEVEL_MINUS_1POINT5DB,
LEVEL_MINUS_3DB,
LEVEL_MINUS_4POINT5DB,
LEVEL_MINUS_6DB,
LEVEL_ZERO,
LEVEL_MINUS_9DB
};
/** Adjustments in dB gain (LFE, +10 to -21 dB) */
static const float gain_levels_lfe[32] = {
3.162275, 2.818382, 2.511886, 2.238719, 1.995261, 1.778278, 1.584893,
1.412536, 1.258924, 1.122018, 1.000000, 0.891251, 0.794328, 0.707946,
0.630957, 0.562341, 0.501187, 0.446683, 0.398107, 0.354813, 0.316227,
0.281838, 0.251188, 0.223872, 0.199526, 0.177828, 0.158489, 0.141253,
0.125892, 0.112201, 0.100000, 0.089125
};
/**
* Table for default stereo downmixing coefficients
* reference: Section 7.8.2 Downmixing Into Two Channels
*/
static const uint8_t ac3_default_coeffs[8][5][2] = {
{ { 2, 7 }, { 7, 2 }, },
{ { 4, 4 }, },
{ { 2, 7 }, { 7, 2 }, },
{ { 2, 7 }, { 5, 5 }, { 7, 2 }, },
{ { 2, 7 }, { 7, 2 }, { 6, 6 }, },
{ { 2, 7 }, { 5, 5 }, { 7, 2 }, { 8, 8 }, },
{ { 2, 7 }, { 7, 2 }, { 6, 7 }, { 7, 6 }, },
{ { 2, 7 }, { 5, 5 }, { 7, 2 }, { 6, 7 }, { 7, 6 }, },
};
static const uint64_t custom_channel_map_locations[16][2] = {
{ 1, AV_CH_FRONT_LEFT },
{ 1, AV_CH_FRONT_CENTER },
{ 1, AV_CH_FRONT_RIGHT },
{ 1, AV_CH_SIDE_LEFT },
{ 1, AV_CH_SIDE_RIGHT },
{ 0, AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER },
{ 0, AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT },
{ 0, AV_CH_BACK_CENTER },
{ 0, AV_CH_TOP_CENTER },
{ 0, AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT },
{ 0, AV_CH_WIDE_LEFT | AV_CH_WIDE_RIGHT },
{ 0, AV_CH_TOP_FRONT_LEFT | AV_CH_TOP_FRONT_RIGHT},
{ 0, AV_CH_TOP_FRONT_CENTER },
{ 0, AV_CH_TOP_BACK_LEFT | AV_CH_TOP_BACK_RIGHT },
{ 0, AV_CH_LOW_FREQUENCY_2 },
{ 1, AV_CH_LOW_FREQUENCY },
};
/**
* Symmetrical Dequantization
* reference: Section 7.3.3 Expansion of Mantissas for Symmetrical Quantization
* Tables 7.19 to 7.23
*/
static inline int
symmetric_dequant(int code, int levels)
{
return ((code - (levels >> 1)) * (1 << 24)) / levels;
}
/*
* Initialize tables at runtime.
*/
static av_cold void ac3_tables_init(void)
{
int i;
/* generate table for ungrouping 3 values in 7 bits
reference: Section 7.1.3 Exponent Decoding */
for (i = 0; i < 128; i++) {
ungroup_3_in_7_bits_tab[i][0] = i / 25;
ungroup_3_in_7_bits_tab[i][1] = (i % 25) / 5;
ungroup_3_in_7_bits_tab[i][2] = (i % 25) % 5;
}
/* generate grouped mantissa tables
reference: Section 7.3.5 Ungrouping of Mantissas */
for (i = 0; i < 32; i++) {
/* bap=1 mantissas */
b1_mantissas[i][0] = symmetric_dequant(ff_ac3_ungroup_3_in_5_bits_tab[i][0], 3);
b1_mantissas[i][1] = symmetric_dequant(ff_ac3_ungroup_3_in_5_bits_tab[i][1], 3);
b1_mantissas[i][2] = symmetric_dequant(ff_ac3_ungroup_3_in_5_bits_tab[i][2], 3);
}
for (i = 0; i < 128; i++) {
/* bap=2 mantissas */
b2_mantissas[i][0] = symmetric_dequant(ungroup_3_in_7_bits_tab[i][0], 5);
b2_mantissas[i][1] = symmetric_dequant(ungroup_3_in_7_bits_tab[i][1], 5);
b2_mantissas[i][2] = symmetric_dequant(ungroup_3_in_7_bits_tab[i][2], 5);
/* bap=4 mantissas */
b4_mantissas[i][0] = symmetric_dequant(i / 11, 11);
b4_mantissas[i][1] = symmetric_dequant(i % 11, 11);
}
/* generate ungrouped mantissa tables
reference: Tables 7.21 and 7.23 */
for (i = 0; i < 7; i++) {
/* bap=3 mantissas */
b3_mantissas[i] = symmetric_dequant(i, 7);
}
for (i = 0; i < 15; i++) {
/* bap=5 mantissas */
b5_mantissas[i] = symmetric_dequant(i, 15);
}
#if (!USE_FIXED)
/* generate dynamic range table
reference: Section 7.7.1 Dynamic Range Control */
for (i = 0; i < 256; i++) {
int v = (i >> 5) - ((i >> 7) << 3) - 5;
dynamic_range_tab[i] = powf(2.0f, v) * ((i & 0x1F) | 0x20);
}
/* generate compr dynamic range table
reference: Section 7.7.2 Heavy Compression */
for (i = 0; i < 256; i++) {
int v = (i >> 4) - ((i >> 7) << 4) - 4;
ff_ac3_heavy_dynamic_range_tab[i] = powf(2.0f, v) * ((i & 0xF) | 0x10);
}
#endif
}
/**
* AVCodec initialization
*/
static av_cold int ac3_decode_init(AVCodecContext *avctx)
{
AC3DecodeContext *s = avctx->priv_data;
int i;
s->avctx = avctx;
ac3_tables_init();
ff_mdct_init(&s->imdct_256, 8, 1, 1.0);
ff_mdct_init(&s->imdct_512, 9, 1, 1.0);
AC3_RENAME(ff_kbd_window_init)(s->window, 5.0, 256);
ff_bswapdsp_init(&s->bdsp);
#if (USE_FIXED)
s->fdsp = avpriv_alloc_fixed_dsp(avctx->flags & AV_CODEC_FLAG_BITEXACT);
#else
s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
ff_fmt_convert_init(&s->fmt_conv, avctx);
#endif
ff_ac3dsp_init(&s->ac3dsp, avctx->flags & AV_CODEC_FLAG_BITEXACT);
av_lfg_init(&s->dith_state, 0);
if (USE_FIXED)
avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
else
avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
/* allow downmixing to stereo or mono */
if (avctx->channels > 1 &&
avctx->request_channel_layout == AV_CH_LAYOUT_MONO)
avctx->channels = 1;
else if (avctx->channels > 2 &&
avctx->request_channel_layout == AV_CH_LAYOUT_STEREO)
avctx->channels = 2;
s->downmixed = 1;
for (i = 0; i < AC3_MAX_CHANNELS; i++) {
s->xcfptr[i] = s->transform_coeffs[i];
s->dlyptr[i] = s->delay[i];
}
return 0;
}
/**
* Parse the 'sync info' and 'bit stream info' from the AC-3 bitstream.
* GetBitContext within AC3DecodeContext must point to
* the start of the synchronized AC-3 bitstream.
*/
static int ac3_parse_header(AC3DecodeContext *s)
{
GetBitContext *gbc = &s->gbc;
int i;
/* read the rest of the bsi. read twice for dual mono mode. */
i = !s->channel_mode;
do {
s->dialog_normalization[(!s->channel_mode)-i] = -get_bits(gbc, 5);
if (s->dialog_normalization[(!s->channel_mode)-i] == 0) {
s->dialog_normalization[(!s->channel_mode)-i] = -31;
}
if (s->target_level != 0) {
s->level_gain[(!s->channel_mode)-i] = powf(2.0f,
(float)(s->target_level -
s->dialog_normalization[(!s->channel_mode)-i])/6.0f);
}
if (s->compression_exists[(!s->channel_mode)-i] = get_bits1(gbc)) {
s->heavy_dynamic_range[(!s->channel_mode)-i] =
AC3_HEAVY_RANGE(get_bits(gbc, 8));
}
if (get_bits1(gbc))
skip_bits(gbc, 8); //skip language code
if (get_bits1(gbc))
skip_bits(gbc, 7); //skip audio production information
} while (i--);
skip_bits(gbc, 2); //skip copyright bit and original bitstream bit
/* skip the timecodes or parse the Alternate Bit Stream Syntax */
if (s->bitstream_id != 6) {
if (get_bits1(gbc))
skip_bits(gbc, 14); //skip timecode1
if (get_bits1(gbc))
skip_bits(gbc, 14); //skip timecode2
} else {
if (get_bits1(gbc)) {
s->preferred_downmix = get_bits(gbc, 2);
s->center_mix_level_ltrt = get_bits(gbc, 3);
s->surround_mix_level_ltrt = av_clip(get_bits(gbc, 3), 3, 7);
s->center_mix_level = get_bits(gbc, 3);
s->surround_mix_level = av_clip(get_bits(gbc, 3), 3, 7);
}
if (get_bits1(gbc)) {
s->dolby_surround_ex_mode = get_bits(gbc, 2);
s->dolby_headphone_mode = get_bits(gbc, 2);
skip_bits(gbc, 10); // skip adconvtyp (1), xbsi2 (8), encinfo (1)
}
}
/* skip additional bitstream info */
if (get_bits1(gbc)) {
i = get_bits(gbc, 6);
do {
skip_bits(gbc, 8);
} while (i--);
}
return 0;
}
/**
* Common function to parse AC-3 or E-AC-3 frame header
*/
static int parse_frame_header(AC3DecodeContext *s)
{
AC3HeaderInfo hdr;
int err;
err = ff_ac3_parse_header(&s->gbc, &hdr);
if (err)
return err;
/* get decoding parameters from header info */
s->bit_alloc_params.sr_code = hdr.sr_code;
s->bitstream_id = hdr.bitstream_id;
s->bitstream_mode = hdr.bitstream_mode;
s->channel_mode = hdr.channel_mode;
s->lfe_on = hdr.lfe_on;
s->bit_alloc_params.sr_shift = hdr.sr_shift;
s->sample_rate = hdr.sample_rate;
s->bit_rate = hdr.bit_rate;
s->channels = hdr.channels;
s->fbw_channels = s->channels - s->lfe_on;
s->lfe_ch = s->fbw_channels + 1;
s->frame_size = hdr.frame_size;
s->superframe_size += hdr.frame_size;
s->preferred_downmix = AC3_DMIXMOD_NOTINDICATED;
s->center_mix_level = hdr.center_mix_level;
s->center_mix_level_ltrt = 4; // -3.0dB
s->surround_mix_level = hdr.surround_mix_level;
s->surround_mix_level_ltrt = 4; // -3.0dB
s->lfe_mix_level_exists = 0;
s->num_blocks = hdr.num_blocks;
s->frame_type = hdr.frame_type;
s->substreamid = hdr.substreamid;
s->dolby_surround_mode = hdr.dolby_surround_mode;
s->dolby_surround_ex_mode = AC3_DSUREXMOD_NOTINDICATED;
s->dolby_headphone_mode = AC3_DHEADPHONMOD_NOTINDICATED;
if (s->lfe_on) {
s->start_freq[s->lfe_ch] = 0;
s->end_freq[s->lfe_ch] = 7;
s->num_exp_groups[s->lfe_ch] = 2;
s->channel_in_cpl[s->lfe_ch] = 0;
}
if (s->bitstream_id <= 10) {
s->eac3 = 0;
s->snr_offset_strategy = 2;
s->block_switch_syntax = 1;
s->dither_flag_syntax = 1;
s->bit_allocation_syntax = 1;
s->fast_gain_syntax = 0;
s->first_cpl_leak = 0;
s->dba_syntax = 1;
s->skip_syntax = 1;
memset(s->channel_uses_aht, 0, sizeof(s->channel_uses_aht));
return ac3_parse_header(s);
} else if (CONFIG_EAC3_DECODER) {
s->eac3 = 1;
return ff_eac3_parse_header(s);
} else {
av_log(s->avctx, AV_LOG_ERROR, "E-AC-3 support not compiled in\n");
return AVERROR(ENOSYS);
}
}
/**
* Set stereo downmixing coefficients based on frame header info.
* reference: Section 7.8.2 Downmixing Into Two Channels
*/
static int set_downmix_coeffs(AC3DecodeContext *s)
{
int i;
float cmix = gain_levels[s-> center_mix_level];
float smix = gain_levels[s->surround_mix_level];
float norm0, norm1;
float downmix_coeffs[2][AC3_MAX_CHANNELS];
if (!s->downmix_coeffs[0]) {
s->downmix_coeffs[0] = av_malloc_array(2 * AC3_MAX_CHANNELS,
sizeof(**s->downmix_coeffs));
if (!s->downmix_coeffs[0])
return AVERROR(ENOMEM);
s->downmix_coeffs[1] = s->downmix_coeffs[0] + AC3_MAX_CHANNELS;
}
for (i = 0; i < s->fbw_channels; i++) {
downmix_coeffs[0][i] = gain_levels[ac3_default_coeffs[s->channel_mode][i][0]];
downmix_coeffs[1][i] = gain_levels[ac3_default_coeffs[s->channel_mode][i][1]];
}
if (s->channel_mode > 1 && s->channel_mode & 1) {
downmix_coeffs[0][1] = downmix_coeffs[1][1] = cmix;
}
if (s->channel_mode == AC3_CHMODE_2F1R || s->channel_mode == AC3_CHMODE_3F1R) {
int nf = s->channel_mode - 2;
downmix_coeffs[0][nf] = downmix_coeffs[1][nf] = smix * LEVEL_MINUS_3DB;
}
if (s->channel_mode == AC3_CHMODE_2F2R || s->channel_mode == AC3_CHMODE_3F2R) {
int nf = s->channel_mode - 4;
downmix_coeffs[0][nf] = downmix_coeffs[1][nf+1] = smix;
}
/* renormalize */
norm0 = norm1 = 0.0;
for (i = 0; i < s->fbw_channels; i++) {
norm0 += downmix_coeffs[0][i];
norm1 += downmix_coeffs[1][i];
}
norm0 = 1.0f / norm0;
norm1 = 1.0f / norm1;
for (i = 0; i < s->fbw_channels; i++) {
downmix_coeffs[0][i] *= norm0;
downmix_coeffs[1][i] *= norm1;
}
if (s->output_mode == AC3_CHMODE_MONO) {
for (i = 0; i < s->fbw_channels; i++)
downmix_coeffs[0][i] = (downmix_coeffs[0][i] +
downmix_coeffs[1][i]) * LEVEL_MINUS_3DB;
}
for (i = 0; i < s->fbw_channels; i++) {
s->downmix_coeffs[0][i] = FIXR12(downmix_coeffs[0][i]);
s->downmix_coeffs[1][i] = FIXR12(downmix_coeffs[1][i]);
}
return 0;
}
/**
* Decode the grouped exponents according to exponent strategy.
* reference: Section 7.1.3 Exponent Decoding
*/
static int decode_exponents(AC3DecodeContext *s,
GetBitContext *gbc, int exp_strategy, int ngrps,
uint8_t absexp, int8_t *dexps)
{
int i, j, grp, group_size;
int dexp[256];
int expacc, prevexp;
/* unpack groups */
group_size = exp_strategy + (exp_strategy == EXP_D45);
for (grp = 0, i = 0; grp < ngrps; grp++) {
expacc = get_bits(gbc, 7);
if (expacc >= 125) {
av_log(s->avctx, AV_LOG_ERROR, "expacc %d is out-of-range\n", expacc);
return AVERROR_INVALIDDATA;
}
dexp[i++] = ungroup_3_in_7_bits_tab[expacc][0];
dexp[i++] = ungroup_3_in_7_bits_tab[expacc][1];
dexp[i++] = ungroup_3_in_7_bits_tab[expacc][2];
}
/* convert to absolute exps and expand groups */
prevexp = absexp;
for (i = 0, j = 0; i < ngrps * 3; i++) {
prevexp += dexp[i] - 2;
if (prevexp > 24U) {
av_log(s->avctx, AV_LOG_ERROR, "exponent %d is out-of-range\n", prevexp);
return -1;
}
switch (group_size) {
case 4: dexps[j++] = prevexp;
dexps[j++] = prevexp;
case 2: dexps[j++] = prevexp;
case 1: dexps[j++] = prevexp;
}
}
return 0;
}
/**
* Generate transform coefficients for each coupled channel in the coupling
* range using the coupling coefficients and coupling coordinates.
* reference: Section 7.4.3 Coupling Coordinate Format
*/
static void calc_transform_coeffs_cpl(AC3DecodeContext *s)
{
int bin, band, ch;
bin = s->start_freq[CPL_CH];
for (band = 0; band < s->num_cpl_bands; band++) {
int band_start = bin;
int band_end = bin + s->cpl_band_sizes[band];
for (ch = 1; ch <= s->fbw_channels; ch++) {
if (s->channel_in_cpl[ch]) {
int cpl_coord = s->cpl_coords[ch][band] << 5;
for (bin = band_start; bin < band_end; bin++) {
s->fixed_coeffs[ch][bin] =
MULH(s->fixed_coeffs[CPL_CH][bin] * (1 << 4), cpl_coord);
}
if (ch == 2 && s->phase_flags[band]) {
for (bin = band_start; bin < band_end; bin++)
s->fixed_coeffs[2][bin] = -s->fixed_coeffs[2][bin];
}
}
}
bin = band_end;
}
}
/**
* Grouped mantissas for 3-level 5-level and 11-level quantization
*/
typedef struct mant_groups {
int b1_mant[2];
int b2_mant[2];
int b4_mant;
int b1;
int b2;
int b4;
} mant_groups;
/**
* Decode the transform coefficients for a particular channel
* reference: Section 7.3 Quantization and Decoding of Mantissas
*/
static void ac3_decode_transform_coeffs_ch(AC3DecodeContext *s, int ch_index, mant_groups *m)
{
int start_freq = s->start_freq[ch_index];
int end_freq = s->end_freq[ch_index];
uint8_t *baps = s->bap[ch_index];
int8_t *exps = s->dexps[ch_index];
int32_t *coeffs = s->fixed_coeffs[ch_index];
int dither = (ch_index == CPL_CH) || s->dither_flag[ch_index];
GetBitContext *gbc = &s->gbc;
int freq;
for (freq = start_freq; freq < end_freq; freq++) {
int bap = baps[freq];
int mantissa;
switch (bap) {
case 0:
/* random noise with approximate range of -0.707 to 0.707 */
if (dither)
mantissa = (((av_lfg_get(&s->dith_state)>>8)*181)>>8) - 5931008;
else
mantissa = 0;
break;
case 1:
if (m->b1) {
m->b1--;
mantissa = m->b1_mant[m->b1];
} else {
int bits = get_bits(gbc, 5);
mantissa = b1_mantissas[bits][0];
m->b1_mant[1] = b1_mantissas[bits][1];
m->b1_mant[0] = b1_mantissas[bits][2];
m->b1 = 2;
}
break;
case 2:
if (m->b2) {
m->b2--;
mantissa = m->b2_mant[m->b2];
} else {
int bits = get_bits(gbc, 7);
mantissa = b2_mantissas[bits][0];
m->b2_mant[1] = b2_mantissas[bits][1];
m->b2_mant[0] = b2_mantissas[bits][2];
m->b2 = 2;
}
break;
case 3:
mantissa = b3_mantissas[get_bits(gbc, 3)];
break;
case 4:
if (m->b4) {
m->b4 = 0;
mantissa = m->b4_mant;
} else {
int bits = get_bits(gbc, 7);
mantissa = b4_mantissas[bits][0];
m->b4_mant = b4_mantissas[bits][1];
m->b4 = 1;
}
break;
case 5:
mantissa = b5_mantissas[get_bits(gbc, 4)];
break;
default: /* 6 to 15 */
/* Shift mantissa and sign-extend it. */
if (bap > 15) {
av_log(s->avctx, AV_LOG_ERROR, "bap %d is invalid in plain AC-3\n", bap);
bap = 15;
}
mantissa = (unsigned)get_sbits(gbc, quantization_tab[bap]) << (24 - quantization_tab[bap]);
break;
}
coeffs[freq] = mantissa >> exps[freq];
}
}
/**
* Remove random dithering from coupling range coefficients with zero-bit
* mantissas for coupled channels which do not use dithering.
* reference: Section 7.3.4 Dither for Zero Bit Mantissas (bap=0)
*/
static void remove_dithering(AC3DecodeContext *s) {
int ch, i;
for (ch = 1; ch <= s->fbw_channels; ch++) {
if (!s->dither_flag[ch] && s->channel_in_cpl[ch]) {
for (i = s->start_freq[CPL_CH]; i < s->end_freq[CPL_CH]; i++) {
if (!s->bap[CPL_CH][i])
s->fixed_coeffs[ch][i] = 0;
}
}
}
}
static inline void decode_transform_coeffs_ch(AC3DecodeContext *s, int blk,
int ch, mant_groups *m)
{
if (!s->channel_uses_aht[ch]) {
ac3_decode_transform_coeffs_ch(s, ch, m);
} else {
/* if AHT is used, mantissas for all blocks are encoded in the first
block of the frame. */
int bin;
if (CONFIG_EAC3_DECODER && !blk)
ff_eac3_decode_transform_coeffs_aht_ch(s, ch);
for (bin = s->start_freq[ch]; bin < s->end_freq[ch]; bin++) {
s->fixed_coeffs[ch][bin] = s->pre_mantissa[ch][bin][blk] >> s->dexps[ch][bin];
}
}
}
/**
* Decode the transform coefficients.
*/
static inline void decode_transform_coeffs(AC3DecodeContext *s, int blk)
{
int ch, end;
int got_cplchan = 0;
mant_groups m;
m.b1 = m.b2 = m.b4 = 0;
for (ch = 1; ch <= s->channels; ch++) {
/* transform coefficients for full-bandwidth channel */
decode_transform_coeffs_ch(s, blk, ch, &m);
/* transform coefficients for coupling channel come right after the
coefficients for the first coupled channel*/
if (s->channel_in_cpl[ch]) {
if (!got_cplchan) {
decode_transform_coeffs_ch(s, blk, CPL_CH, &m);
calc_transform_coeffs_cpl(s);
got_cplchan = 1;
}
end = s->end_freq[CPL_CH];
} else {
end = s->end_freq[ch];
}
do
s->fixed_coeffs[ch][end] = 0;
while (++end < 256);
}
/* zero the dithered coefficients for appropriate channels */
remove_dithering(s);
}
/**
* Stereo rematrixing.
* reference: Section 7.5.4 Rematrixing : Decoding Technique
*/
static void do_rematrixing(AC3DecodeContext *s)
{
int bnd, i;
int end, bndend;
end = FFMIN(s->end_freq[1], s->end_freq[2]);
for (bnd = 0; bnd < s->num_rematrixing_bands; bnd++) {
if (s->rematrixing_flags[bnd]) {
bndend = FFMIN(end, ff_ac3_rematrix_band_tab[bnd + 1]);
for (i = ff_ac3_rematrix_band_tab[bnd]; i < bndend; i++) {
int tmp0 = s->fixed_coeffs[1][i];
s->fixed_coeffs[1][i] += s->fixed_coeffs[2][i];
s->fixed_coeffs[2][i] = tmp0 - s->fixed_coeffs[2][i];
}
}
}
}
/**
* Inverse MDCT Transform.
* Convert frequency domain coefficients to time-domain audio samples.
* reference: Section 7.9.4 Transformation Equations
*/
static inline void do_imdct(AC3DecodeContext *s, int channels, int offset)
{
int ch;
for (ch = 1; ch <= channels; ch++) {
if (s->block_switch[ch]) {
int i;
FFTSample *x = s->tmp_output + 128;
for (i = 0; i < 128; i++)
x[i] = s->transform_coeffs[ch][2 * i];
s->imdct_256.imdct_half(&s->imdct_256, s->tmp_output, x);
#if USE_FIXED
s->fdsp->vector_fmul_window_scaled(s->outptr[ch - 1], s->delay[ch - 1 + offset],
s->tmp_output, s->window, 128, 8);
#else
s->fdsp->vector_fmul_window(s->outptr[ch - 1], s->delay[ch - 1 + offset],
s->tmp_output, s->window, 128);
#endif
for (i = 0; i < 128; i++)
x[i] = s->transform_coeffs[ch][2 * i + 1];
s->imdct_256.imdct_half(&s->imdct_256, s->delay[ch - 1 + offset], x);
} else {
s->imdct_512.imdct_half(&s->imdct_512, s->tmp_output, s->transform_coeffs[ch]);
#if USE_FIXED
s->fdsp->vector_fmul_window_scaled(s->outptr[ch - 1], s->delay[ch - 1 + offset],
s->tmp_output, s->window, 128, 8);
#else
s->fdsp->vector_fmul_window(s->outptr[ch - 1], s->delay[ch - 1 + offset],
s->tmp_output, s->window, 128);
#endif
memcpy(s->delay[ch - 1 + offset], s->tmp_output + 128, 128 * sizeof(FFTSample));
}
}
}
/**
* Upmix delay samples from stereo to original channel layout.
*/
static void ac3_upmix_delay(AC3DecodeContext *s)
{
int channel_data_size = sizeof(s->delay[0]);
switch (s->channel_mode) {
case AC3_CHMODE_DUALMONO:
case AC3_CHMODE_STEREO:
/* upmix mono to stereo */
memcpy(s->delay[1], s->delay[0], channel_data_size);
break;
case AC3_CHMODE_2F2R:
memset(s->delay[3], 0, channel_data_size);
case AC3_CHMODE_2F1R:
memset(s->delay[2], 0, channel_data_size);
break;
case AC3_CHMODE_3F2R:
memset(s->delay[4], 0, channel_data_size);
case AC3_CHMODE_3F1R:
memset(s->delay[3], 0, channel_data_size);
case AC3_CHMODE_3F:
memcpy(s->delay[2], s->delay[1], channel_data_size);
memset(s->delay[1], 0, channel_data_size);
break;
}
}
/**
* Decode band structure for coupling, spectral extension, or enhanced coupling.
* The band structure defines how many subbands are in each band. For each
* subband in the range, 1 means it is combined with the previous band, and 0
* means that it starts a new band.
*
* @param[in] gbc bit reader context
* @param[in] blk block number
* @param[in] eac3 flag to indicate E-AC-3
* @param[in] ecpl flag to indicate enhanced coupling
* @param[in] start_subband subband number for start of range
* @param[in] end_subband subband number for end of range
* @param[in] default_band_struct default band structure table
* @param[out] num_bands number of bands (optionally NULL)
* @param[out] band_sizes array containing the number of bins in each band (optionally NULL)
* @param[in,out] band_struct current band structure
*/
static void decode_band_structure(GetBitContext *gbc, int blk, int eac3,
int ecpl, int start_subband, int end_subband,
const uint8_t *default_band_struct,
int *num_bands, uint8_t *band_sizes,
uint8_t *band_struct, int band_struct_size)
{
int subbnd, bnd, n_subbands, n_bands=0;
uint8_t bnd_sz[22];
n_subbands = end_subband - start_subband;
if (!blk)
memcpy(band_struct, default_band_struct, band_struct_size);
av_assert0(band_struct_size >= start_subband + n_subbands);
band_struct += start_subband + 1;
/* decode band structure from bitstream or use default */
if (!eac3 || get_bits1(gbc)) {
for (subbnd = 0; subbnd < n_subbands - 1; subbnd++) {
band_struct[subbnd] = get_bits1(gbc);
}
}
/* calculate number of bands and band sizes based on band structure.
note that the first 4 subbands in enhanced coupling span only 6 bins
instead of 12. */
if (num_bands || band_sizes ) {
n_bands = n_subbands;
bnd_sz[0] = ecpl ? 6 : 12;
for (bnd = 0, subbnd = 1; subbnd < n_subbands; subbnd++) {
int subbnd_size = (ecpl && subbnd < 4) ? 6 : 12;
if (band_struct[subbnd - 1]) {
n_bands--;
bnd_sz[bnd] += subbnd_size;
} else {
bnd_sz[++bnd] = subbnd_size;
}
}
}
/* set optional output params */
if (num_bands)
*num_bands = n_bands;
if (band_sizes)
memcpy(band_sizes, bnd_sz, n_bands);
}
static inline int spx_strategy(AC3DecodeContext *s, int blk)
{
GetBitContext *bc = &s->gbc;
int fbw_channels = s->fbw_channels;
int dst_start_freq, dst_end_freq, src_start_freq,
start_subband, end_subband, ch;
/* determine which channels use spx */
if (s->channel_mode == AC3_CHMODE_MONO) {
s->channel_uses_spx[1] = 1;
} else {
for (ch = 1; ch <= fbw_channels; ch++)
s->channel_uses_spx[ch] = get_bits1(bc);
}
/* get the frequency bins of the spx copy region and the spx start
and end subbands */
dst_start_freq = get_bits(bc, 2);
start_subband = get_bits(bc, 3) + 2;
if (start_subband > 7)
start_subband += start_subband - 7;
end_subband = get_bits(bc, 3) + 5;
#if USE_FIXED
s->spx_dst_end_freq = end_freq_inv_tab[end_subband-5];
#endif
if (end_subband > 7)
end_subband += end_subband - 7;
dst_start_freq = dst_start_freq * 12 + 25;
src_start_freq = start_subband * 12 + 25;
dst_end_freq = end_subband * 12 + 25;
/* check validity of spx ranges */
if (start_subband >= end_subband) {
av_log(s->avctx, AV_LOG_ERROR, "invalid spectral extension "
"range (%d >= %d)\n", start_subband, end_subband);
return AVERROR_INVALIDDATA;
}
if (dst_start_freq >= src_start_freq) {
av_log(s->avctx, AV_LOG_ERROR, "invalid spectral extension "
"copy start bin (%d >= %d)\n", dst_start_freq, src_start_freq);
return AVERROR_INVALIDDATA;
}
s->spx_dst_start_freq = dst_start_freq;
s->spx_src_start_freq = src_start_freq;
if (!USE_FIXED)
s->spx_dst_end_freq = dst_end_freq;
decode_band_structure(bc, blk, s->eac3, 0,
start_subband, end_subband,
ff_eac3_default_spx_band_struct,
&s->num_spx_bands,
s->spx_band_sizes,
s->spx_band_struct, sizeof(s->spx_band_struct));
return 0;
}
static inline void spx_coordinates(AC3DecodeContext *s)
{
GetBitContext *bc = &s->gbc;
int fbw_channels = s->fbw_channels;
int ch, bnd;
for (ch = 1; ch <= fbw_channels; ch++) {
if (s->channel_uses_spx[ch]) {
if (s->first_spx_coords[ch] || get_bits1(bc)) {
INTFLOAT spx_blend;
int bin, master_spx_coord;
s->first_spx_coords[ch] = 0;
spx_blend = AC3_SPX_BLEND(get_bits(bc, 5));
master_spx_coord = get_bits(bc, 2) * 3;
bin = s->spx_src_start_freq;
for (bnd = 0; bnd < s->num_spx_bands; bnd++) {
int bandsize = s->spx_band_sizes[bnd];
int spx_coord_exp, spx_coord_mant;
INTFLOAT nratio, sblend, nblend;
#if USE_FIXED
/* calculate blending factors */
int64_t accu = ((bin << 23) + (bandsize << 22))
* (int64_t)s->spx_dst_end_freq;
nratio = (int)(accu >> 32);
nratio -= spx_blend << 18;
if (nratio < 0) {
nblend = 0;
sblend = 0x800000;
} else if (nratio > 0x7fffff) {
nblend = 14529495; // sqrt(3) in FP.23
sblend = 0;
} else {
nblend = fixed_sqrt(nratio, 23);
accu = (int64_t)nblend * 1859775393;
nblend = (int)((accu + (1<<29)) >> 30);
sblend = fixed_sqrt(0x800000 - nratio, 23);
}
#else
float spx_coord;
/* calculate blending factors */
nratio = ((float)((bin + (bandsize >> 1))) / s->spx_dst_end_freq) - spx_blend;
nratio = av_clipf(nratio, 0.0f, 1.0f);
nblend = sqrtf(3.0f * nratio); // noise is scaled by sqrt(3)
// to give unity variance
sblend = sqrtf(1.0f - nratio);
#endif
bin += bandsize;
/* decode spx coordinates */
spx_coord_exp = get_bits(bc, 4);
spx_coord_mant = get_bits(bc, 2);
if (spx_coord_exp == 15) spx_coord_mant <<= 1;
else spx_coord_mant += 4;
spx_coord_mant <<= (25 - spx_coord_exp - master_spx_coord);
/* multiply noise and signal blending factors by spx coordinate */
#if USE_FIXED
accu = (int64_t)nblend * spx_coord_mant;
s->spx_noise_blend[ch][bnd] = (int)((accu + (1<<22)) >> 23);
accu = (int64_t)sblend * spx_coord_mant;
s->spx_signal_blend[ch][bnd] = (int)((accu + (1<<22)) >> 23);
#else
spx_coord = spx_coord_mant * (1.0f / (1 << 23));
s->spx_noise_blend [ch][bnd] = nblend * spx_coord;
s->spx_signal_blend[ch][bnd] = sblend * spx_coord;
#endif
}
}
} else {
s->first_spx_coords[ch] = 1;
}
}
}
static inline int coupling_strategy(AC3DecodeContext *s, int blk,
uint8_t *bit_alloc_stages)
{
GetBitContext *bc = &s->gbc;
int fbw_channels = s->fbw_channels;
int channel_mode = s->channel_mode;
int ch;
memset(bit_alloc_stages, 3, AC3_MAX_CHANNELS);
if (!s->eac3)
s->cpl_in_use[blk] = get_bits1(bc);
if (s->cpl_in_use[blk]) {
/* coupling in use */
int cpl_start_subband, cpl_end_subband;
if (channel_mode < AC3_CHMODE_STEREO) {
av_log(s->avctx, AV_LOG_ERROR, "coupling not allowed in mono or dual-mono\n");
return AVERROR_INVALIDDATA;
}
/* check for enhanced coupling */
if (s->eac3 && get_bits1(bc)) {
/* TODO: parse enhanced coupling strategy info */
avpriv_request_sample(s->avctx, "Enhanced coupling");
return AVERROR_PATCHWELCOME;
}
/* determine which channels are coupled */
if (s->eac3 && s->channel_mode == AC3_CHMODE_STEREO) {
s->channel_in_cpl[1] = 1;
s->channel_in_cpl[2] = 1;