virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-11-21 10:55:51 +02:00
Code Issues Releases Activity
a1a8815220
FFmpeg/libavcodec/atrac3plus.c
Andreas Rheinhardt a1a8815220 libavcodec: Reduce the size of some arrays 
This commit uses smaller types for some static const arrays to reduce
their size in case the entries can be represented in the smaller type.
The biggest savings came from inv_map_table in vp9.c.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2019-06-20 14:47:46 -03:00

1812 lines
70 KiB
C
Raw Blame History

/*
* ATRAC3+ compatible decoder
*
* Copyright (c) 2010-2013 Maxim Poliakovski
*
* 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
* Bitstream parser for ATRAC3+ decoder.
*/
#include "libavutil/avassert.h"
#include "avcodec.h"
#include "get_bits.h"
#include "atrac3plus.h"
#include "atrac3plus_data.h"
static VLC_TYPE tables_data[154276][2];
static VLC wl_vlc_tabs[4];
static VLC sf_vlc_tabs[8];
static VLC ct_vlc_tabs[4];
static VLC spec_vlc_tabs[112];
static VLC gain_vlc_tabs[11];
static VLC tone_vlc_tabs[7];
/**
* Generate canonical VLC table from given descriptor.
*
* @param[in] cb ptr to codebook descriptor
* @param[in] xlat ptr to translation table or NULL
* @param[in,out] tab_offset starting offset to the generated vlc table
* @param[out] out_vlc ptr to vlc table to be generated
*/
static av_cold void build_canonical_huff(const uint8_t *cb, const uint8_t *xlat,
int *tab_offset, VLC *out_vlc)
{
int i, b;
uint16_t codes[256];
uint8_t bits[256];
unsigned code = 0;
int index = 0;
int min_len = *cb++; // get shortest codeword length
int max_len = *cb++; // get longest codeword length
for (b = min_len; b <= max_len; b++) {
for (i = *cb++; i > 0; i--) {
av_assert0(index < 256);
bits[index] = b;
codes[index] = code++;
index++;
}
code <<= 1;
}
out_vlc->table = &tables_data[*tab_offset];
out_vlc->table_allocated = 1 << max_len;
ff_init_vlc_sparse(out_vlc, max_len, index, bits, 1, 1, codes, 2, 2,
xlat, 1, 1, INIT_VLC_USE_NEW_STATIC);
*tab_offset += 1 << max_len;
}
av_cold void ff_atrac3p_init_vlcs(void)
{
int i, wl_vlc_offs, ct_vlc_offs, sf_vlc_offs, tab_offset;
static const uint8_t wl_nb_bits[4] = { 2, 3, 5, 5 };
static const uint8_t wl_nb_codes[4] = { 3, 5, 8, 8 };
static const uint8_t * const wl_bits[4] = {
atrac3p_wl_huff_bits1, atrac3p_wl_huff_bits2,
atrac3p_wl_huff_bits3, atrac3p_wl_huff_bits4
};
static const uint8_t * const wl_codes[4] = {
atrac3p_wl_huff_code1, atrac3p_wl_huff_code2,
atrac3p_wl_huff_code3, atrac3p_wl_huff_code4
};
static const uint8_t * const wl_xlats[4] = {
atrac3p_wl_huff_xlat1, atrac3p_wl_huff_xlat2, NULL, NULL
};
static const uint8_t ct_nb_bits[4] = { 3, 4, 4, 4 };
static const uint8_t ct_nb_codes[4] = { 4, 8, 8, 8 };
static const uint8_t * const ct_bits[4] = {
atrac3p_ct_huff_bits1, atrac3p_ct_huff_bits2,
atrac3p_ct_huff_bits2, atrac3p_ct_huff_bits3
};
static const uint8_t * const ct_codes[4] = {
atrac3p_ct_huff_code1, atrac3p_ct_huff_code2,
atrac3p_ct_huff_code2, atrac3p_ct_huff_code3
};
static const uint8_t * const ct_xlats[4] = {
NULL, NULL, atrac3p_ct_huff_xlat1, NULL
};
static const uint8_t sf_nb_bits[8] = { 9, 9, 9, 9, 6, 6, 7, 7 };
static const uint8_t sf_nb_codes[8] = { 64, 64, 64, 64, 16, 16, 16, 16 };
static const uint8_t * const sf_bits[8] = {
atrac3p_sf_huff_bits1, atrac3p_sf_huff_bits1, atrac3p_sf_huff_bits2,
atrac3p_sf_huff_bits3, atrac3p_sf_huff_bits4, atrac3p_sf_huff_bits4,
atrac3p_sf_huff_bits5, atrac3p_sf_huff_bits6
};
static const uint16_t * const sf_codes[8] = {
atrac3p_sf_huff_code1, atrac3p_sf_huff_code1, atrac3p_sf_huff_code2,
atrac3p_sf_huff_code3, atrac3p_sf_huff_code4, atrac3p_sf_huff_code4,
atrac3p_sf_huff_code5, atrac3p_sf_huff_code6
};
static const uint8_t * const sf_xlats[8] = {
atrac3p_sf_huff_xlat1, atrac3p_sf_huff_xlat2, NULL, NULL,
atrac3p_sf_huff_xlat4, atrac3p_sf_huff_xlat5, NULL, NULL
};
static const uint8_t * const gain_cbs[11] = {
atrac3p_huff_gain_npoints1_cb, atrac3p_huff_gain_npoints1_cb,
atrac3p_huff_gain_lev1_cb, atrac3p_huff_gain_lev2_cb,
atrac3p_huff_gain_lev3_cb, atrac3p_huff_gain_lev4_cb,
atrac3p_huff_gain_loc3_cb, atrac3p_huff_gain_loc1_cb,
atrac3p_huff_gain_loc4_cb, atrac3p_huff_gain_loc2_cb,
atrac3p_huff_gain_loc5_cb
};
static const uint8_t * const gain_xlats[11] = {
NULL, atrac3p_huff_gain_npoints2_xlat, atrac3p_huff_gain_lev1_xlat,
atrac3p_huff_gain_lev2_xlat, atrac3p_huff_gain_lev3_xlat,
atrac3p_huff_gain_lev4_xlat, atrac3p_huff_gain_loc3_xlat,
atrac3p_huff_gain_loc1_xlat, atrac3p_huff_gain_loc4_xlat,
atrac3p_huff_gain_loc2_xlat, atrac3p_huff_gain_loc5_xlat
};
static const uint8_t * const tone_cbs[7] = {
atrac3p_huff_tonebands_cb, atrac3p_huff_numwavs1_cb,
atrac3p_huff_numwavs2_cb, atrac3p_huff_wav_ampsf1_cb,
atrac3p_huff_wav_ampsf2_cb, atrac3p_huff_wav_ampsf3_cb,
atrac3p_huff_freq_cb
};
static const uint8_t * const tone_xlats[7] = {
NULL, NULL, atrac3p_huff_numwavs2_xlat, atrac3p_huff_wav_ampsf1_xlat,
atrac3p_huff_wav_ampsf2_xlat, atrac3p_huff_wav_ampsf3_xlat,
atrac3p_huff_freq_xlat
};
for (i = 0, wl_vlc_offs = 0, ct_vlc_offs = 2508; i < 4; i++) {
wl_vlc_tabs[i].table = &tables_data[wl_vlc_offs];
wl_vlc_tabs[i].table_allocated = 1 << wl_nb_bits[i];
ct_vlc_tabs[i].table = &tables_data[ct_vlc_offs];
ct_vlc_tabs[i].table_allocated = 1 << ct_nb_bits[i];
ff_init_vlc_sparse(&wl_vlc_tabs[i], wl_nb_bits[i], wl_nb_codes[i],
wl_bits[i], 1, 1,
wl_codes[i], 1, 1,
wl_xlats[i], 1, 1,
INIT_VLC_USE_NEW_STATIC);
ff_init_vlc_sparse(&ct_vlc_tabs[i], ct_nb_bits[i], ct_nb_codes[i],
ct_bits[i], 1, 1,
ct_codes[i], 1, 1,
ct_xlats[i], 1, 1,
INIT_VLC_USE_NEW_STATIC);
wl_vlc_offs += wl_vlc_tabs[i].table_allocated;
ct_vlc_offs += ct_vlc_tabs[i].table_allocated;
}
for (i = 0, sf_vlc_offs = 76; i < 8; i++) {
sf_vlc_tabs[i].table = &tables_data[sf_vlc_offs];
sf_vlc_tabs[i].table_allocated = 1 << sf_nb_bits[i];
ff_init_vlc_sparse(&sf_vlc_tabs[i], sf_nb_bits[i], sf_nb_codes[i],
sf_bits[i], 1, 1,
sf_codes[i], 2, 2,
sf_xlats[i], 1, 1,
INIT_VLC_USE_NEW_STATIC);
sf_vlc_offs += sf_vlc_tabs[i].table_allocated;
}
tab_offset = 2564;
/* build huffman tables for spectrum decoding */
for (i = 0; i < 112; i++) {
if (atrac3p_spectra_tabs[i].cb)
build_canonical_huff(atrac3p_spectra_tabs[i].cb,
atrac3p_spectra_tabs[i].xlat,
&tab_offset, &spec_vlc_tabs[i]);
else
spec_vlc_tabs[i].table = 0;
}
/* build huffman tables for gain data decoding */
for (i = 0; i < 11; i++)
build_canonical_huff(gain_cbs[i], gain_xlats[i], &tab_offset, &gain_vlc_tabs[i]);
/* build huffman tables for tone decoding */
for (i = 0; i < 7; i++)
build_canonical_huff(tone_cbs[i], tone_xlats[i], &tab_offset, &tone_vlc_tabs[i]);
}
/**
* Decode number of coded quantization units.
*
* @param[in] gb the GetBit context
* @param[in,out] chan ptr to the channel parameters
* @param[in,out] ctx ptr to the channel unit context
* @param[in] avctx ptr to the AVCodecContext
* @return result code: 0 = OK, otherwise - error code
*/
static int num_coded_units(GetBitContext *gb, Atrac3pChanParams *chan,
Atrac3pChanUnitCtx *ctx, AVCodecContext *avctx)
{
chan->fill_mode = get_bits(gb, 2);
if (!chan->fill_mode) {
chan->num_coded_vals = ctx->num_quant_units;
} else {
chan->num_coded_vals = get_bits(gb, 5);
if (chan->num_coded_vals > ctx->num_quant_units) {
av_log(avctx, AV_LOG_ERROR,
"Invalid number of transmitted units!\n");
return AVERROR_INVALIDDATA;
}
if (chan->fill_mode == 3)
chan->split_point = get_bits(gb, 2) + (chan->ch_num << 1) + 1;
}
return 0;
}
/**
* Add weighting coefficients to the decoded word-length information.
*
* @param[in,out] ctx ptr to the channel unit context
* @param[in,out] chan ptr to the channel parameters
* @param[in] wtab_idx index of the table of weights
* @param[in] avctx ptr to the AVCodecContext
* @return result code: 0 = OK, otherwise - error code
*/
static int add_wordlen_weights(Atrac3pChanUnitCtx *ctx,
Atrac3pChanParams *chan, int wtab_idx,
AVCodecContext *avctx)
{
int i;
const int8_t *weights_tab =
&atrac3p_wl_weights[chan->ch_num * 3 + wtab_idx - 1][0];
for (i = 0; i < ctx->num_quant_units; i++) {
chan->qu_wordlen[i] += weights_tab[i];
if (chan->qu_wordlen[i] < 0 || chan->qu_wordlen[i] > 7) {
av_log(avctx, AV_LOG_ERROR,
"WL index out of range: pos=%d, val=%d!\n",
i, chan->qu_wordlen[i]);
return AVERROR_INVALIDDATA;
}
}
return 0;
}
/**
* Subtract weighting coefficients from decoded scalefactors.
*
* @param[in,out] ctx ptr to the channel unit context
* @param[in,out] chan ptr to the channel parameters
* @param[in] wtab_idx index of table of weights
* @param[in] avctx ptr to the AVCodecContext
* @return result code: 0 = OK, otherwise - error code
*/
static int subtract_sf_weights(Atrac3pChanUnitCtx *ctx,
Atrac3pChanParams *chan, int wtab_idx,
AVCodecContext *avctx)
{
int i;
const int8_t *weights_tab = &atrac3p_sf_weights[wtab_idx - 1][0];
for (i = 0; i < ctx->used_quant_units; i++) {
chan->qu_sf_idx[i] -= weights_tab[i];
if (chan->qu_sf_idx[i] < 0 || chan->qu_sf_idx[i] > 63) {
av_log(avctx, AV_LOG_ERROR,
"SF index out of range: pos=%d, val=%d!\n",
i, chan->qu_sf_idx[i]);
return AVERROR_INVALIDDATA;
}
}
return 0;
}
/**
* Unpack vector quantization tables.
*
* @param[in] start_val start value for the unpacked table
* @param[in] shape_vec ptr to table to unpack
* @param[out] dst ptr to output array
* @param[in] num_values number of values to unpack
*/
static inline void unpack_vq_shape(int start_val, const int8_t *shape_vec,
int *dst, int num_values)
{
int i;
if (num_values) {
dst[0] = dst[1] = dst[2] = start_val;
for (i = 3; i < num_values; i++)
dst[i] = start_val - shape_vec[atrac3p_qu_num_to_seg[i] - 1];
}
}
#define UNPACK_SF_VQ_SHAPE(gb, dst, num_vals) \
start_val = get_bits((gb), 6); \
unpack_vq_shape(start_val, &atrac3p_sf_shapes[get_bits((gb), 6)][0], \
(dst), (num_vals))
/**
* Decode word length for each quantization unit of a channel.
*
* @param[in] gb the GetBit context
* @param[in,out] ctx ptr to the channel unit context
* @param[in] ch_num channel to process
* @param[in] avctx ptr to the AVCodecContext
* @return result code: 0 = OK, otherwise - error code
*/
static int decode_channel_wordlen(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
int ch_num, AVCodecContext *avctx)
{
int i, weight_idx = 0, delta, diff, pos, delta_bits, min_val, flag,
ret, start_val;
VLC *vlc_tab;
Atrac3pChanParams *chan = &ctx->channels[ch_num];
Atrac3pChanParams *ref_chan = &ctx->channels[0];
chan->fill_mode = 0;
switch (get_bits(gb, 2)) { /* switch according to coding mode */
case 0: /* coded using constant number of bits */
for (i = 0; i < ctx->num_quant_units; i++)
chan->qu_wordlen[i] = get_bits(gb, 3);
break;
case 1:
if (ch_num) {
if ((ret = num_coded_units(gb, chan, ctx, avctx)) < 0)
return ret;
if (chan->num_coded_vals) {
vlc_tab = &wl_vlc_tabs[get_bits(gb, 2)];
for (i = 0; i < chan->num_coded_vals; i++) {
delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1);
chan->qu_wordlen[i] = (ref_chan->qu_wordlen[i] + delta) & 7;
}
}
} else {
weight_idx = get_bits(gb, 2);
if ((ret = num_coded_units(gb, chan, ctx, avctx)) < 0)
return ret;
if (chan->num_coded_vals) {
pos = get_bits(gb, 5);
if (pos > chan->num_coded_vals) {
av_log(avctx, AV_LOG_ERROR,
"WL mode 1: invalid position!\n");
return AVERROR_INVALIDDATA;
}
delta_bits = get_bits(gb, 2);
min_val = get_bits(gb, 3);
for (i = 0; i < pos; i++)
chan->qu_wordlen[i] = get_bits(gb, 3);
for (i = pos; i < chan->num_coded_vals; i++)
chan->qu_wordlen[i] = (min_val + get_bitsz(gb, delta_bits)) & 7;
}
}
break;
case 2:
if ((ret = num_coded_units(gb, chan, ctx, avctx)) < 0)
return ret;
if (ch_num && chan->num_coded_vals) {
vlc_tab = &wl_vlc_tabs[get_bits(gb, 2)];
delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1);
chan->qu_wordlen[0] = (ref_chan->qu_wordlen[0] + delta) & 7;
for (i = 1; i < chan->num_coded_vals; i++) {
diff = ref_chan->qu_wordlen[i] - ref_chan->qu_wordlen[i - 1];
delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1);
chan->qu_wordlen[i] = (chan->qu_wordlen[i - 1] + diff + delta) & 7;
}
} else if (chan->num_coded_vals) {
flag = get_bits(gb, 1);
vlc_tab = &wl_vlc_tabs[get_bits(gb, 1)];
start_val = get_bits(gb, 3);
unpack_vq_shape(start_val,
&atrac3p_wl_shapes[start_val][get_bits(gb, 4)][0],
chan->qu_wordlen, chan->num_coded_vals);
if (!flag) {
for (i = 0; i < chan->num_coded_vals; i++) {
delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1);
chan->qu_wordlen[i] = (chan->qu_wordlen[i] + delta) & 7;
}
} else {
for (i = 0; i < (chan->num_coded_vals & - 2); i += 2)
if (!get_bits1(gb)) {
chan->qu_wordlen[i] = (chan->qu_wordlen[i] +
get_vlc2(gb, vlc_tab->table,
vlc_tab->bits, 1)) & 7;
chan->qu_wordlen[i + 1] = (chan->qu_wordlen[i + 1] +
get_vlc2(gb, vlc_tab->table,
vlc_tab->bits, 1)) & 7;
}
if (chan->num_coded_vals & 1)
chan->qu_wordlen[i] = (chan->qu_wordlen[i] +
get_vlc2(gb, vlc_tab->table,
vlc_tab->bits, 1)) & 7;
}
}
break;
case 3:
weight_idx = get_bits(gb, 2);
if ((ret = num_coded_units(gb, chan, ctx, avctx)) < 0)
return ret;
if (chan->num_coded_vals) {
vlc_tab = &wl_vlc_tabs[get_bits(gb, 2)];
/* first coefficient is coded directly */
chan->qu_wordlen[0] = get_bits(gb, 3);
for (i = 1; i < chan->num_coded_vals; i++) {
delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1);
chan->qu_wordlen[i] = (chan->qu_wordlen[i - 1] + delta) & 7;
}
}
break;
}
if (chan->fill_mode == 2) {
for (i = chan->num_coded_vals; i < ctx->num_quant_units; i++)
chan->qu_wordlen[i] = ch_num ? get_bits1(gb) : 1;
} else if (chan->fill_mode == 3) {
pos = ch_num ? chan->num_coded_vals + chan->split_point
: ctx->num_quant_units - chan->split_point;
for (i = chan->num_coded_vals; i < pos; i++)
chan->qu_wordlen[i] = 1;
}
if (weight_idx)
return add_wordlen_weights(ctx, chan, weight_idx, avctx);
return 0;
}
/**
* Decode scale factor indexes for each quant unit of a channel.
*
* @param[in] gb the GetBit context
* @param[in,out] ctx ptr to the channel unit context
* @param[in] ch_num channel to process
* @param[in] avctx ptr to the AVCodecContext
* @return result code: 0 = OK, otherwise - error code
*/
static int decode_channel_sf_idx(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
int ch_num, AVCodecContext *avctx)
{
int i, weight_idx = 0, delta, diff, num_long_vals,
delta_bits, min_val, vlc_sel, start_val;
VLC *vlc_tab;
Atrac3pChanParams *chan = &ctx->channels[ch_num];
Atrac3pChanParams *ref_chan = &ctx->channels[0];
switch (get_bits(gb, 2)) { /* switch according to coding mode */
case 0: /* coded using constant number of bits */
for (i = 0; i < ctx->used_quant_units; i++)
chan->qu_sf_idx[i] = get_bits(gb, 6);
break;
case 1:
if (ch_num) {
vlc_tab = &sf_vlc_tabs[get_bits(gb, 2)];
for (i = 0; i < ctx->used_quant_units; i++) {
delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1);
chan->qu_sf_idx[i] = (ref_chan->qu_sf_idx[i] + delta) & 0x3F;
}
} else {
weight_idx = get_bits(gb, 2);
if (weight_idx == 3) {
UNPACK_SF_VQ_SHAPE(gb, chan->qu_sf_idx, ctx->used_quant_units);
num_long_vals = get_bits(gb, 5);
delta_bits = get_bits(gb, 2);
min_val = get_bits(gb, 4) - 7;
for (i = 0; i < num_long_vals; i++)
chan->qu_sf_idx[i] = (chan->qu_sf_idx[i] +
get_bits(gb, 4) - 7) & 0x3F;
/* all others are: min_val + delta */
for (i = num_long_vals; i < ctx->used_quant_units; i++)
chan->qu_sf_idx[i] = (chan->qu_sf_idx[i] + min_val +
get_bitsz(gb, delta_bits)) & 0x3F;
} else {
num_long_vals = get_bits(gb, 5);
delta_bits = get_bits(gb, 3);
min_val = get_bits(gb, 6);
if (num_long_vals > ctx->used_quant_units || delta_bits == 7) {
av_log(avctx, AV_LOG_ERROR,
"SF mode 1: invalid parameters!\n");
return AVERROR_INVALIDDATA;
}
/* read full-precision SF indexes */
for (i = 0; i < num_long_vals; i++)
chan->qu_sf_idx[i] = get_bits(gb, 6);
/* all others are: min_val + delta */
for (i = num_long_vals; i < ctx->used_quant_units; i++)
chan->qu_sf_idx[i] = (min_val +
get_bitsz(gb, delta_bits)) & 0x3F;
}
}
break;
case 2:
if (ch_num) {
vlc_tab = &sf_vlc_tabs[get_bits(gb, 2)];
delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1);
chan->qu_sf_idx[0] = (ref_chan->qu_sf_idx[0] + delta) & 0x3F;
for (i = 1; i < ctx->used_quant_units; i++) {
diff = ref_chan->qu_sf_idx[i] - ref_chan->qu_sf_idx[i - 1];
delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1);
chan->qu_sf_idx[i] = (chan->qu_sf_idx[i - 1] + diff + delta) & 0x3F;
}
} else {
vlc_tab = &sf_vlc_tabs[get_bits(gb, 2) + 4];
UNPACK_SF_VQ_SHAPE(gb, chan->qu_sf_idx, ctx->used_quant_units);
for (i = 0; i < ctx->used_quant_units; i++) {
delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1);
chan->qu_sf_idx[i] = (chan->qu_sf_idx[i] +
sign_extend(delta, 4)) & 0x3F;
}
}
break;
case 3:
if (ch_num) {
/* copy coefficients from reference channel */
for (i = 0; i < ctx->used_quant_units; i++)
chan->qu_sf_idx[i] = ref_chan->qu_sf_idx[i];
} else {
weight_idx = get_bits(gb, 2);
vlc_sel = get_bits(gb, 2);
vlc_tab = &sf_vlc_tabs[vlc_sel];
if (weight_idx == 3) {
vlc_tab = &sf_vlc_tabs[vlc_sel + 4];
UNPACK_SF_VQ_SHAPE(gb, chan->qu_sf_idx, ctx->used_quant_units);
diff = (get_bits(gb, 4) + 56) & 0x3F;
chan->qu_sf_idx[0] = (chan->qu_sf_idx[0] + diff) & 0x3F;
for (i = 1; i < ctx->used_quant_units; i++) {
delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1);
diff = (diff + sign_extend(delta, 4)) & 0x3F;
chan->qu_sf_idx[i] = (diff + chan->qu_sf_idx[i]) & 0x3F;
}
} else {
/* 1st coefficient is coded directly */
chan->qu_sf_idx[0] = get_bits(gb, 6);
for (i = 1; i < ctx->used_quant_units; i++) {
delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1);
chan->qu_sf_idx[i] = (chan->qu_sf_idx[i - 1] + delta) & 0x3F;
}
}
}
break;
}
if (weight_idx && weight_idx < 3)
return subtract_sf_weights(ctx, chan, weight_idx, avctx);
return 0;
}
/**
* Decode word length information for each channel.
*
* @param[in] gb the GetBit context
* @param[in,out] ctx ptr to the channel unit context
* @param[in] num_channels number of channels to process
* @param[in] avctx ptr to the AVCodecContext
* @return result code: 0 = OK, otherwise - error code
*/
static int decode_quant_wordlen(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
int num_channels, AVCodecContext *avctx)
{
int ch_num, i, ret;
for (ch_num = 0; ch_num < num_channels; ch_num++) {
memset(ctx->channels[ch_num].qu_wordlen, 0,
sizeof(ctx->channels[ch_num].qu_wordlen));
if ((ret = decode_channel_wordlen(gb, ctx, ch_num, avctx)) < 0)
return ret;
}
/* scan for last non-zero coeff in both channels and
* set number of quant units having coded spectrum */
for (i = ctx->num_quant_units - 1; i >= 0; i--)
if (ctx->channels[0].qu_wordlen[i] ||
(num_channels == 2 && ctx->channels[1].qu_wordlen[i]))
break;
ctx->used_quant_units = i + 1;
return 0;
}
/**
* Decode scale factor indexes for each channel.
*
* @param[in] gb the GetBit context
* @param[in,out] ctx ptr to the channel unit context
* @param[in] num_channels number of channels to process
* @param[in] avctx ptr to the AVCodecContext
* @return result code: 0 = OK, otherwise - error code
*/
static int decode_scale_factors(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
int num_channels, AVCodecContext *avctx)
{
int ch_num, ret;
if (!ctx->used_quant_units)
return 0;
for (ch_num = 0; ch_num < num_channels; ch_num++) {
memset(ctx->channels[ch_num].qu_sf_idx, 0,
sizeof(ctx->channels[ch_num].qu_sf_idx));
if ((ret = decode_channel_sf_idx(gb, ctx, ch_num, avctx)) < 0)
return ret;
}
return 0;
}
/**
* Decode number of code table values.
*
* @param[in] gb the GetBit context
* @param[in,out] ctx ptr to the channel unit context
* @param[in] avctx ptr to the AVCodecContext
* @return result code: 0 = OK, otherwise - error code
*/
static int get_num_ct_values(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
AVCodecContext *avctx)
{
int num_coded_vals;
if (get_bits1(gb)) {
num_coded_vals = get_bits(gb, 5);
if (num_coded_vals > ctx->used_quant_units) {
av_log(avctx, AV_LOG_ERROR,
"Invalid number of code table indexes: %d!\n", num_coded_vals);
return AVERROR_INVALIDDATA;
}
return num_coded_vals;
} else
return ctx->used_quant_units;
}
#define DEC_CT_IDX_COMMON(OP) \
num_vals = get_num_ct_values(gb, ctx, avctx); \
if (num_vals < 0) \
return num_vals; \
\
for (i = 0; i < num_vals; i++) { \
if (chan->qu_wordlen[i]) { \
chan->qu_tab_idx[i] = OP; \
} else if (ch_num && ref_chan->qu_wordlen[i]) \
/* get clone master flag */ \
chan->qu_tab_idx[i] = get_bits1(gb); \
}
#define CODING_DIRECT get_bits(gb, num_bits)
#define CODING_VLC get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1)
#define CODING_VLC_DELTA \
(!i) ? CODING_VLC \
: (pred + get_vlc2(gb, delta_vlc->table, \
delta_vlc->bits, 1)) & mask; \
pred = chan->qu_tab_idx[i]
#define CODING_VLC_DIFF \
(ref_chan->qu_tab_idx[i] + \
get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1)) & mask
/**
* Decode code table indexes for each quant unit of a channel.
*
* @param[in] gb the GetBit context
* @param[in,out] ctx ptr to the channel unit context
* @param[in] ch_num channel to process
* @param[in] avctx ptr to the AVCodecContext
* @return result code: 0 = OK, otherwise - error code
*/
static int decode_channel_code_tab(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
int ch_num, AVCodecContext *avctx)
{
int i, num_vals, num_bits, pred;
int mask = ctx->use_full_table ? 7 : 3; /* mask for modular arithmetic */
VLC *vlc_tab, *delta_vlc;
Atrac3pChanParams *chan = &ctx->channels[ch_num];
Atrac3pChanParams *ref_chan = &ctx->channels[0];
chan->table_type = get_bits1(gb);
switch (get_bits(gb, 2)) { /* switch according to coding mode */
case 0: /* directly coded */
num_bits = ctx->use_full_table + 2;
DEC_CT_IDX_COMMON(CODING_DIRECT);
break;
case 1: /* entropy-coded */
vlc_tab = ctx->use_full_table ? &ct_vlc_tabs[1]
: ct_vlc_tabs;
DEC_CT_IDX_COMMON(CODING_VLC);
break;
case 2: /* entropy-coded delta */
if (ctx->use_full_table) {
vlc_tab = &ct_vlc_tabs[1];
delta_vlc = &ct_vlc_tabs[2];
} else {
vlc_tab = ct_vlc_tabs;
delta_vlc = ct_vlc_tabs;
}
pred = 0;
DEC_CT_IDX_COMMON(CODING_VLC_DELTA);
break;
case 3: /* entropy-coded difference to master */
if (ch_num) {
vlc_tab = ctx->use_full_table ? &ct_vlc_tabs[3]
: ct_vlc_tabs;
DEC_CT_IDX_COMMON(CODING_VLC_DIFF);
}
break;
}
return 0;
}
/**
* Decode code table indexes for each channel.
*
* @param[in] gb the GetBit context
* @param[in,out] ctx ptr to the channel unit context
* @param[in] num_channels number of channels to process
* @param[in] avctx ptr to the AVCodecContext
* @return result code: 0 = OK, otherwise - error code
*/
static int decode_code_table_indexes(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
int num_channels, AVCodecContext *avctx)
{
int ch_num, ret;
if (!ctx->used_quant_units)
return 0;
ctx->use_full_table = get_bits1(gb);
for (ch_num = 0; ch_num < num_channels; ch_num++) {
memset(ctx->channels[ch_num].qu_tab_idx, 0,
sizeof(ctx->channels[ch_num].qu_tab_idx));
if ((ret = decode_channel_code_tab(gb, ctx, ch_num, avctx)) < 0)
return ret;
}
return 0;
}
/**
* Decode huffman-coded spectral lines for a given quant unit.
*
* This is a generalized version for all known coding modes.
* Its speed can be improved by creating separate functions for each mode.
*
* @param[in] gb the GetBit context
* @param[in] tab code table telling how to decode spectral lines
* @param[in] vlc_tab ptr to the huffman table associated with the code table
* @param[out] out pointer to buffer where decoded data should be stored
* @param[in] num_specs number of spectral lines to decode
*/
static void decode_qu_spectra(GetBitContext *gb, const Atrac3pSpecCodeTab *tab,
VLC *vlc_tab, int16_t *out, const int num_specs)
{
int i, j, pos, cf;
int group_size = tab->group_size;
int num_coeffs = tab->num_coeffs;
int bits = tab->bits;
int is_signed = tab->is_signed;
unsigned val;
for (pos = 0; pos < num_specs;) {
if (group_size == 1 || get_bits1(gb)) {
for (j = 0; j < group_size; j++) {
val = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1);
for (i = 0; i < num_coeffs; i++) {
cf = av_mod_uintp2(val, bits);
if (is_signed)
cf = sign_extend(cf, bits);
else if (cf && get_bits1(gb))
cf = -cf;
out[pos++] = cf;
val >>= bits;
}
}
} else /* group skipped */
pos += group_size * num_coeffs;
}
}
/**
* Decode huffman-coded IMDCT spectrum for all channels.
*
* @param[in] gb the GetBit context
* @param[in,out] ctx ptr to the channel unit context
* @param[in] num_channels number of channels to process
* @param[in] avctx ptr to the AVCodecContext
*/
static void decode_spectrum(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
int num_channels, AVCodecContext *avctx)
{
int i, ch_num, qu, wordlen, codetab, tab_index, num_specs;
const Atrac3pSpecCodeTab *tab;
Atrac3pChanParams *chan;
for (ch_num = 0; ch_num < num_channels; ch_num++) {
chan = &ctx->channels[ch_num];
memset(chan->spectrum, 0, sizeof(chan->spectrum));
/* set power compensation level to disabled */
memset(chan->power_levs, ATRAC3P_POWER_COMP_OFF, sizeof(chan->power_levs));
for (qu = 0; qu < ctx->used_quant_units; qu++) {
num_specs = ff_atrac3p_qu_to_spec_pos[qu + 1] -
ff_atrac3p_qu_to_spec_pos[qu];
wordlen = chan->qu_wordlen[qu];
codetab = chan->qu_tab_idx[qu];
if (wordlen) {
if (!ctx->use_full_table)
codetab = atrac3p_ct_restricted_to_full[chan->table_type][wordlen - 1][codetab];
tab_index = (chan->table_type * 8 + codetab) * 7 + wordlen - 1;
tab = &atrac3p_spectra_tabs[tab_index];
/* this allows reusing VLC tables */
if (tab->redirect >= 0)
tab_index = tab->redirect;
decode_qu_spectra(gb, tab, &spec_vlc_tabs[tab_index],
&chan->spectrum[ff_atrac3p_qu_to_spec_pos[qu]],
num_specs);
} else if (ch_num && ctx->channels[0].qu_wordlen[qu] && !codetab) {
/* copy coefficients from master */
memcpy(&chan->spectrum[ff_atrac3p_qu_to_spec_pos[qu]],
&ctx->channels[0].spectrum[ff_atrac3p_qu_to_spec_pos[qu]],
num_specs *
sizeof(chan->spectrum[ff_atrac3p_qu_to_spec_pos[qu]]));
chan->qu_wordlen[qu] = ctx->channels[0].qu_wordlen[qu];
}
}
/* Power compensation levels only present in the bitstream
* if there are more than 2 quant units. The lowest two units
* correspond to the frequencies 0...351 Hz, whose shouldn't
* be affected by the power compensation. */
if (ctx->used_quant_units > 2) {
num_specs = atrac3p_subband_to_num_powgrps[ctx->num_coded_subbands - 1];
for (i = 0; i < num_specs; i++)
chan->power_levs[i] = get_bits(gb, 4);
}
}
}
/**
* Retrieve specified amount of flag bits from the input bitstream.
* The data can be shortened in the case of the following two common conditions:
* if all bits are zero then only one signal bit = 0 will be stored,
* if all bits are ones then two signal bits = 1,0 will be stored.
* Otherwise, all necessary bits will be directly stored
* prefixed by two signal bits = 1,1.
*
* @param[in] gb ptr to the GetBitContext
* @param[out] out where to place decoded flags
* @param[in] num_flags number of flags to process
* @return: 0 = all flag bits are zero, 1 = there is at least one non-zero flag bit
*/
static int get_subband_flags(GetBitContext *gb, uint8_t *out, int num_flags)
{
int i, result;
memset(out, 0, num_flags);
result = get_bits1(gb);
if (result) {
if (get_bits1(gb))
for (i = 0; i < num_flags; i++)
out[i] = get_bits1(gb);
else
memset(out, 1, num_flags);
}
return result;
}
/**
* Decode mdct window shape flags for all channels.
*
* @param[in] gb the GetBit context
* @param[in,out] ctx ptr to the channel unit context
* @param[in] num_channels number of channels to process
*/
static void decode_window_shape(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
int num_channels)
{
int ch_num;
for (ch_num = 0; ch_num < num_channels; ch_num++)
get_subband_flags(gb, ctx->channels[ch_num].wnd_shape,
ctx->num_subbands);
}
/**
* Decode number of gain control points.
*
* @param[in] gb the GetBit context
* @param[in,out] ctx ptr to the channel unit context
* @param[in] ch_num channel to process
* @param[in] coded_subbands number of subbands to process
* @return result code: 0 = OK, otherwise - error code
*/
static int decode_gainc_npoints(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
int ch_num, int coded_subbands)
{
int i, delta, delta_bits, min_val;
Atrac3pChanParams *chan = &ctx->channels[ch_num];
Atrac3pChanParams *ref_chan = &ctx->channels[0];
switch (get_bits(gb, 2)) { /* switch according to coding mode */
case 0: /* fixed-length coding */
for (i = 0; i < coded_subbands; i++)
chan->gain_data[i].num_points = get_bits(gb, 3);
break;
case 1: /* variable-length coding */
for (i = 0; i < coded_subbands; i++)
chan->gain_data[i].num_points =
get_vlc2(gb, gain_vlc_tabs[0].table,
gain_vlc_tabs[0].bits, 1);
break;
case 2:
if (ch_num) { /* VLC modulo delta to master channel */
for (i = 0; i < coded_subbands; i++) {
delta = get_vlc2(gb, gain_vlc_tabs[1].table,
gain_vlc_tabs[1].bits, 1);
chan->gain_data[i].num_points =
(ref_chan->gain_data[i].num_points + delta) & 7;
}
} else { /* VLC modulo delta to previous */
chan->gain_data[0].num_points =
get_vlc2(gb, gain_vlc_tabs[0].table,
gain_vlc_tabs[0].bits, 1);
for (i = 1; i < coded_subbands; i++) {
delta = get_vlc2(gb, gain_vlc_tabs[1].table,
gain_vlc_tabs[1].bits, 1);
chan->gain_data[i].num_points =
(chan->gain_data[i - 1].num_points + delta) & 7;
}
}
break;
case 3:
if (ch_num) { /* copy data from master channel */
for (i = 0; i < coded_subbands; i++)
chan->gain_data[i].num_points =
ref_chan->gain_data[i].num_points;
} else { /* shorter delta to min */
delta_bits = get_bits(gb, 2);
min_val = get_bits(gb, 3);
for (i = 0; i < coded_subbands; i++) {
chan->gain_data[i].num_points = min_val + get_bitsz(gb, delta_bits);
if (chan->gain_data[i].num_points > 7)
return AVERROR_INVALIDDATA;
}
}
}
return 0;
}
/**
* Implements coding mode 3 (slave) for gain compensation levels.
*
* @param[out] dst ptr to the output array
* @param[in] ref ptr to the reference channel
*/
static inline void gainc_level_mode3s(AtracGainInfo *dst, AtracGainInfo *ref)
{
int i;
for (i = 0; i < dst->num_points; i++)
dst->lev_code[i] = (i >= ref->num_points) ? 7 : ref->lev_code[i];
}
/**
* Implements coding mode 1 (master) for gain compensation levels.
*
* @param[in] gb the GetBit context
* @param[in] ctx ptr to the channel unit context
* @param[out] dst ptr to the output array
*/
static inline void gainc_level_mode1m(GetBitContext *gb,
Atrac3pChanUnitCtx *ctx,
AtracGainInfo *dst)
{
int i, delta;
if (dst->num_points > 0)
dst->lev_code[0] = get_vlc2(gb, gain_vlc_tabs[2].table,
gain_vlc_tabs[2].bits, 1);
for (i = 1; i < dst->num_points; i++) {
delta = get_vlc2(gb, gain_vlc_tabs[3].table,
gain_vlc_tabs[3].bits, 1);
dst->lev_code[i] = (dst->lev_code[i - 1] + delta) & 0xF;
}
}
/**
* Decode level code for each gain control point.
*
* @param[in] gb the GetBit context
* @param[in,out] ctx ptr to the channel unit context
* @param[in] ch_num channel to process
* @param[in] coded_subbands number of subbands to process
* @return result code: 0 = OK, otherwise - error code
*/
static int decode_gainc_levels(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
int ch_num, int coded_subbands)
{
int sb, i, delta, delta_bits, min_val, pred;
Atrac3pChanParams *chan = &ctx->channels[ch_num];
Atrac3pChanParams *ref_chan = &ctx->channels[0];
switch (get_bits(gb, 2)) { /* switch according to coding mode */
case 0: /* fixed-length coding */
for (sb = 0; sb < coded_subbands; sb++)
for (i = 0; i < chan->gain_data[sb].num_points; i++)
chan->gain_data[sb].lev_code[i] = get_bits(gb, 4);
break;
case 1:
if (ch_num) { /* VLC modulo delta to master channel */
for (sb = 0; sb < coded_subbands; sb++)
for (i = 0; i < chan->gain_data[sb].num_points; i++) {
delta = get_vlc2(gb, gain_vlc_tabs[5].table,
gain_vlc_tabs[5].bits, 1);
pred = (i >= ref_chan->gain_data[sb].num_points)
? 7 : ref_chan->gain_data[sb].lev_code[i];
chan->gain_data[sb].lev_code[i] = (pred + delta) & 0xF;
}
} else { /* VLC modulo delta to previous */
for (sb = 0; sb < coded_subbands; sb++)
gainc_level_mode1m(gb, ctx, &chan->gain_data[sb]);
}
break;
case 2:
if (ch_num) { /* VLC modulo delta to previous or clone master */
for (sb = 0; sb < coded_subbands; sb++)
if (chan->gain_data[sb].num_points > 0) {
if (get_bits1(gb))
gainc_level_mode1m(gb, ctx, &chan->gain_data[sb]);
else
gainc_level_mode3s(&chan->gain_data[sb],
&ref_chan->gain_data[sb]);
}
} else { /* VLC modulo delta to lev_codes of previous subband */
if (chan->gain_data[0].num_points > 0)
gainc_level_mode1m(gb, ctx, &chan->gain_data[0]);
for (sb = 1; sb < coded_subbands; sb++)
for (i = 0; i < chan->gain_data[sb].num_points; i++) {
delta = get_vlc2(gb, gain_vlc_tabs[4].table,
gain_vlc_tabs[4].bits, 1);
pred = (i >= chan->gain_data[sb - 1].num_points)
? 7 : chan->gain_data[sb - 1].lev_code[i];
chan->gain_data[sb].lev_code[i] = (pred + delta) & 0xF;
}
}
break;
case 3:
if (ch_num) { /* clone master */
for (sb = 0; sb < coded_subbands; sb++)
gainc_level_mode3s(&chan->gain_data[sb],
&ref_chan->gain_data[sb]);
} else { /* shorter delta to min */
delta_bits = get_bits(gb, 2);
min_val = get_bits(gb, 4);
for (sb = 0; sb < coded_subbands; sb++)
for (i = 0; i < chan->gain_data[sb].num_points; i++) {
chan->gain_data[sb].lev_code[i] = min_val + get_bitsz(gb, delta_bits);
if (chan->gain_data[sb].lev_code[i] > 15)
return AVERROR_INVALIDDATA;
}
}
break;
}
return 0;
}
/**
* Implements coding mode 0 for gain compensation locations.
*
* @param[in] gb the GetBit context
* @param[in] ctx ptr to the channel unit context
* @param[out] dst ptr to the output array
* @param[in] pos position of the value to be processed
*/
static inline void gainc_loc_mode0(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
AtracGainInfo *dst, int pos)
{
int delta_bits;
if (!pos || dst->loc_code[pos - 1] < 15)
dst->loc_code[pos] = get_bits(gb, 5);
else if (dst->loc_code[pos - 1] >= 30)
dst->loc_code[pos] = 31;
else {
delta_bits = av_log2(30 - dst->loc_code[pos - 1]) + 1;
dst->loc_code[pos] = dst->loc_code[pos - 1] +
get_bits(gb, delta_bits) + 1;
}
}
/**
* Implements coding mode 1 for gain compensation locations.
*
* @param[in] gb the GetBit context
* @param[in] ctx ptr to the channel unit context
* @param[out] dst ptr to the output array
*/
static inline void gainc_loc_mode1(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
AtracGainInfo *dst)
{
int i;
VLC *tab;
if (dst->num_points > 0) {
/* 1st coefficient is stored directly */
dst->loc_code[0] = get_bits(gb, 5);
for (i = 1; i < dst->num_points; i++) {
/* switch VLC according to the curve direction
* (ascending/descending) */
tab = (dst->lev_code[i] <= dst->lev_code[i - 1])
? &gain_vlc_tabs[7]
: &gain_vlc_tabs[9];
dst->loc_code[i] = dst->loc_code[i - 1] +
get_vlc2(gb, tab->table, tab->bits, 1);
}
}
}
/**
* Decode location code for each gain control point.
*
* @param[in] gb the GetBit context
* @param[in,out] ctx ptr to the channel unit context
* @param[in] ch_num channel to process
* @param[in] coded_subbands number of subbands to process
* @param[in] avctx ptr to the AVCodecContext
* @return result code: 0 = OK, otherwise - error code
*/
static int decode_gainc_loc_codes(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
int ch_num, int coded_subbands,
AVCodecContext *avctx)
{
int sb, i, delta, delta_bits, min_val, pred, more_than_ref;
AtracGainInfo *dst, *ref;
VLC *tab;
Atrac3pChanParams *chan = &ctx->channels[ch_num];
Atrac3pChanParams *ref_chan = &ctx->channels[0];
switch (get_bits(gb, 2)) { /* switch according to coding mode */
case 0: /* sequence of numbers in ascending order */
for (sb = 0; sb < coded_subbands; sb++)
for (i = 0; i < chan->gain_data[sb].num_points; i++)
gainc_loc_mode0(gb, ctx, &chan->gain_data[sb], i);
break;
case 1:
if (ch_num) {
for (sb = 0; sb < coded_subbands; sb++) {
if (chan->gain_data[sb].num_points <= 0)
continue;
dst = &chan->gain_data[sb];
ref = &ref_chan->gain_data[sb];
/* 1st value is vlc-coded modulo delta to master */
delta = get_vlc2(gb, gain_vlc_tabs[10].table,
gain_vlc_tabs[10].bits, 1);
pred = ref->num_points > 0 ? ref->loc_code[0] : 0;
dst->loc_code[0] = (pred + delta) & 0x1F;
for (i = 1; i < dst->num_points; i++) {
more_than_ref = i >= ref->num_points;
if (dst->lev_code[i] > dst->lev_code[i - 1]) {
/* ascending curve */
if (more_than_ref) {
delta =
get_vlc2(gb, gain_vlc_tabs[9].table,
gain_vlc_tabs[9].bits, 1);
dst->loc_code[i] = dst->loc_code[i - 1] + delta;
} else {
if (get_bits1(gb))
gainc_loc_mode0(gb, ctx, dst, i); // direct coding
else
dst->loc_code[i] = ref->loc_code[i]; // clone master
}
} else { /* descending curve */
tab = more_than_ref ? &gain_vlc_tabs[7]
: &gain_vlc_tabs[10];
delta = get_vlc2(gb, tab->table, tab->bits, 1);
if (more_than_ref)
dst->loc_code[i] = dst->loc_code[i - 1] + delta;
else
dst->loc_code[i] = (ref->loc_code[i] + delta) & 0x1F;
}
}
}
} else /* VLC delta to previous */
for (sb = 0; sb < coded_subbands; sb++)
gainc_loc_mode1(gb, ctx, &chan->gain_data[sb]);
break;
case 2:
if (ch_num) {
for (sb = 0; sb < coded_subbands; sb++) {
if (chan->gain_data[sb].num_points <= 0)
continue;
dst = &chan->gain_data[sb];
ref = &ref_chan->gain_data[sb];
if (dst->num_points > ref->num_points || get_bits1(gb))
gainc_loc_mode1(gb, ctx, dst);
else /* clone master for the whole subband */
for (i = 0; i < chan->gain_data[sb].num_points; i++)
dst->loc_code[i] = ref->loc_code[i];
}
} else {
/* data for the first subband is coded directly */
for (i = 0; i < chan->gain_data[0].num_points; i++)
gainc_loc_mode0(gb, ctx, &chan->gain_data[0], i);
for (sb = 1; sb < coded_subbands; sb++) {
if (chan->gain_data[sb].num_points <= 0)
continue;
dst = &chan->gain_data[sb];
/* 1st value is vlc-coded modulo delta to the corresponding
* value of the previous subband if any or zero */
delta = get_vlc2(gb, gain_vlc_tabs[6].table,
gain_vlc_tabs[6].bits, 1);
pred = dst[-1].num_points > 0
? dst[-1].loc_code[0] : 0;
dst->loc_code[0] = (pred + delta) & 0x1F;
for (i = 1; i < dst->num_points; i++) {
more_than_ref = i >= dst[-1].num_points;
/* Select VLC table according to curve direction and
* presence of prediction. */
tab = &gain_vlc_tabs[(dst->lev_code[i] > dst->lev_code[i - 1]) *
2 + more_than_ref + 6];
delta = get_vlc2(gb, tab->table, tab->bits, 1);
if (more_than_ref)
dst->loc_code[i] = dst->loc_code[i - 1] + delta;
else
dst->loc_code[i] = (dst[-1].loc_code[i] + delta) & 0x1F;
}
}
}
break;
case 3:
if (ch_num) { /* clone master or direct or direct coding */
for (sb = 0; sb < coded_subbands; sb++)
for (i = 0; i < chan->gain_data[sb].num_points; i++) {
if (i >= ref_chan->gain_data[sb].num_points)
gainc_loc_mode0(gb, ctx, &chan->gain_data[sb], i);
else
chan->gain_data[sb].loc_code[i] =
ref_chan->gain_data[sb].loc_code[i];
}
} else { /* shorter delta to min */
delta_bits = get_bits(gb, 2) + 1;
min_val = get_bits(gb, 5);
for (sb = 0; sb < coded_subbands; sb++)
for (i = 0; i < chan->gain_data[sb].num_points; i++)
chan->gain_data[sb].loc_code[i] = min_val + i +
get_bits(gb, delta_bits);
}
break;
}
/* Validate decoded information */
for (sb = 0; sb < coded_subbands; sb++) {
dst = &chan->gain_data[sb];
for (i = 0; i < chan->gain_data[sb].num_points; i++) {
if (dst->loc_code[i] < 0 || dst->loc_code[i] > 31 ||
(i && dst->loc_code[i] <= dst->loc_code[i - 1])) {
av_log(avctx, AV_LOG_ERROR,
"Invalid gain location: ch=%d, sb=%d, pos=%d, val=%d\n",
ch_num, sb, i, dst->loc_code[i]);
return AVERROR_INVALIDDATA;
}
}
}
return 0;
}
/**
* Decode gain control data for all channels.
*
* @param[in] gb the GetBit context
* @param[in,out] ctx ptr to the channel unit context
* @param[in] num_channels number of channels to process
* @param[in] avctx ptr to the AVCodecContext
* @return result code: 0 = OK, otherwise - error code
*/
static int decode_gainc_data(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
int num_channels, AVCodecContext *avctx)
{
int ch_num, coded_subbands, sb, ret;
for (ch_num = 0; ch_num < num_channels; ch_num++) {
memset(ctx->channels[ch_num].gain_data, 0,
sizeof(*ctx->channels[ch_num].gain_data) * ATRAC3P_SUBBANDS);
if (get_bits1(gb)) { /* gain control data present? */
coded_subbands = get_bits(gb, 4) + 1;
if (get_bits1(gb)) /* is high band gain data replication on? */
ctx->channels[ch_num].num_gain_subbands = get_bits(gb, 4) + 1;
else
ctx->channels[ch_num].num_gain_subbands = coded_subbands;
if ((ret = decode_gainc_npoints(gb, ctx, ch_num, coded_subbands)) < 0 ||
(ret = decode_gainc_levels(gb, ctx, ch_num, coded_subbands)) < 0 ||
(ret = decode_gainc_loc_codes(gb, ctx, ch_num, coded_subbands, avctx)) < 0)
return ret;
if (coded_subbands > 0) { /* propagate gain data if requested */
for (sb = coded_subbands; sb < ctx->channels[ch_num].num_gain_subbands; sb++)
ctx->channels[ch_num].gain_data[sb] =
ctx->channels[ch_num].gain_data[sb - 1];
}
} else {
ctx->channels[ch_num].num_gain_subbands = 0;
}
}
return 0;
}
/**
* Decode envelope for all tones of a channel.
*
* @param[in] gb the GetBit context
* @param[in,out] ctx ptr to the channel unit context
* @param[in] ch_num channel to process
* @param[in] band_has_tones ptr to an array of per-band-flags:
* 1 - tone data present
*/
static void decode_tones_envelope(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
int ch_num, int band_has_tones[])
{
int sb;
Atrac3pWavesData *dst = ctx->channels[ch_num].tones_info;
Atrac3pWavesData *ref = ctx->channels[0].tones_info;
if (!ch_num || !get_bits1(gb)) { /* mode 0: fixed-length coding */
for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) {
if (!band_has_tones[sb])
continue;
dst[sb].pend_env.has_start_point = get_bits1(gb);
dst[sb].pend_env.start_pos = dst[sb].pend_env.has_start_point
? get_bits(gb, 5) : -1;
dst[sb].pend_env.has_stop_point = get_bits1(gb);
dst[sb].pend_env.stop_pos = dst[sb].pend_env.has_stop_point
? get_bits(gb, 5) : 32;
}
} else { /* mode 1(slave only): copy master */
for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) {
if (!band_has_tones[sb])
continue;
dst[sb].pend_env.has_start_point = ref[sb].pend_env.has_start_point;
dst[sb].pend_env.has_stop_point = ref[sb].pend_env.has_stop_point;
dst[sb].pend_env.start_pos = ref[sb].pend_env.start_pos;
dst[sb].pend_env.stop_pos = ref[sb].pend_env.stop_pos;
}
}
}
/**
* Decode number of tones for each subband of a channel.
*
* @param[in] gb the GetBit context
* @param[in,out] ctx ptr to the channel unit context
* @param[in] ch_num channel to process
* @param[in] band_has_tones ptr to an array of per-band-flags:
* 1 - tone data present
* @param[in] avctx ptr to the AVCodecContext
* @return result code: 0 = OK, otherwise - error code
*/
static int decode_band_numwavs(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
int ch_num, int band_has_tones[],
AVCodecContext *avctx)
{
int mode, sb, delta;
Atrac3pWavesData *dst = ctx->channels[ch_num].tones_info;
Atrac3pWavesData *ref = ctx->channels[0].tones_info;
mode = get_bits(gb, ch_num + 1);
switch (mode) {
case 0: /** fixed-length coding */
for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++)
if (band_has_tones[sb])
dst[sb].num_wavs = get_bits(gb, 4);
break;
case 1: /** variable-length coding */
for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++)
if (band_has_tones[sb])
dst[sb].num_wavs =
get_vlc2(gb, tone_vlc_tabs[1].table,
tone_vlc_tabs[1].bits, 1);
break;
case 2: /** VLC modulo delta to master (slave only) */
for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++)
if (band_has_tones[sb]) {
delta = get_vlc2(gb, tone_vlc_tabs[2].table,
tone_vlc_tabs[2].bits, 1);
delta = sign_extend(delta, 3);
dst[sb].num_wavs = (ref[sb].num_wavs + delta) & 0xF;
}
break;
case 3: /** copy master (slave only) */
for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++)
if (band_has_tones[sb])
dst[sb].num_wavs = ref[sb].num_wavs;
break;
}
/** initialize start tone index for each subband */
for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++)
if (band_has_tones[sb]) {
if (ctx->waves_info->tones_index + dst[sb].num_wavs > 48) {
av_log(avctx, AV_LOG_ERROR,
"Too many tones: %d (max. 48), frame: %d!\n",
ctx->waves_info->tones_index + dst[sb].num_wavs,
avctx->frame_number);
return AVERROR_INVALIDDATA;
}
dst[sb].start_index = ctx->waves_info->tones_index;
ctx->waves_info->tones_index += dst[sb].num_wavs;
}
return 0;
}
/**
* Decode frequency information for each subband of a channel.
*
* @param[in] gb the GetBit context
* @param[in,out] ctx ptr to the channel unit context
* @param[in] ch_num channel to process
* @param[in] band_has_tones ptr to an array of per-band-flags:
* 1 - tone data present
*/
static void decode_tones_frequency(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
int ch_num, int band_has_tones[])
{
int sb, i, direction, nbits, pred, delta;
Atrac3pWaveParam *iwav, *owav;
Atrac3pWavesData *dst = ctx->channels[ch_num].tones_info;
Atrac3pWavesData *ref = ctx->channels[0].tones_info;
if (!ch_num || !get_bits1(gb)) { /* mode 0: fixed-length coding */
for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) {
if (!band_has_tones[sb] || !dst[sb].num_wavs)
continue;
iwav = &ctx->waves_info->waves[dst[sb].start_index];
direction = (dst[sb].num_wavs > 1) ? get_bits1(gb) : 0;
if (direction) { /** packed numbers in descending order */
if (dst[sb].num_wavs)
iwav[dst[sb].num_wavs - 1].freq_index = get_bits(gb, 10);
for (i = dst[sb].num_wavs - 2; i >= 0 ; i--) {
nbits = av_log2(iwav[i+1].freq_index) + 1;
iwav[i].freq_index = get_bits(gb, nbits);
}
} else { /** packed numbers in ascending order */
for (i = 0; i < dst[sb].num_wavs; i++) {
if (!i || iwav[i - 1].freq_index < 512)
iwav[i].freq_index = get_bits(gb, 10);
else {
nbits = av_log2(1023 - iwav[i - 1].freq_index) + 1;
iwav[i].freq_index = get_bits(gb, nbits) +
1024 - (1 << nbits);
}
}
}
}
} else { /* mode 1: VLC modulo delta to master (slave only) */
for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) {
if (!band_has_tones[sb] || !dst[sb].num_wavs)
continue;
iwav = &ctx->waves_info->waves[ref[sb].start_index];
owav = &ctx->waves_info->waves[dst[sb].start_index];
for (i = 0; i < dst[sb].num_wavs; i++) {
delta = get_vlc2(gb, tone_vlc_tabs[6].table,
tone_vlc_tabs[6].bits, 1);
delta = sign_extend(delta, 8);
pred = (i < ref[sb].num_wavs) ? iwav[i].freq_index :
(ref[sb].num_wavs ? iwav[ref[sb].num_wavs - 1].freq_index : 0);
owav[i].freq_index = (pred + delta) & 0x3FF;
}
}
}
}
/**
* Decode amplitude information for each subband of a channel.
*
* @param[in] gb the GetBit context
* @param[in,out] ctx ptr to the channel unit context
* @param[in] ch_num channel to process
* @param[in] band_has_tones ptr to an array of per-band-flags:
* 1 - tone data present
*/
static void decode_tones_amplitude(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
int ch_num, int band_has_tones[])
{
int mode, sb, j, i, diff, maxdiff, fi, delta, pred;
Atrac3pWaveParam *wsrc, *wref;
int refwaves[48] = { 0 };
Atrac3pWavesData *dst = ctx->channels[ch_num].tones_info;
Atrac3pWavesData *ref = ctx->channels[0].tones_info;
if (ch_num) {
for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) {
if (!band_has_tones[sb] || !dst[sb].num_wavs)
continue;
wsrc = &ctx->waves_info->waves[dst[sb].start_index];
wref = &ctx->waves_info->waves[ref[sb].start_index];
for (j = 0; j < dst[sb].num_wavs; j++) {
for (i = 0, fi = 0, maxdiff = 1024; i < ref[sb].num_wavs; i++) {
diff = FFABS(wsrc[j].freq_index - wref[i].freq_index);
if (diff < maxdiff) {
maxdiff = diff;
fi = i;
}
}
if (maxdiff < 8)
refwaves[dst[sb].start_index + j] = fi + ref[sb].start_index;
else if (j < ref[sb].num_wavs)
refwaves[dst[sb].start_index + j] = j + ref[sb].start_index;
else
refwaves[dst[sb].start_index + j] = -1;
}
}
}
mode = get_bits(gb, ch_num + 1);
switch (mode) {
case 0: /** fixed-length coding */
for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) {
if (!band_has_tones[sb] || !dst[sb].num_wavs)
continue;
if (ctx->waves_info->amplitude_mode)
for (i = 0; i < dst[sb].num_wavs; i++)
ctx->waves_info->waves[dst[sb].start_index + i].amp_sf = get_bits(gb, 6);
else
ctx->waves_info->waves[dst[sb].start_index].amp_sf = get_bits(gb, 6);
}
break;
case 1: /** min + VLC delta */
for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) {
if (!band_has_tones[sb] || !dst[sb].num_wavs)
continue;
if (ctx->waves_info->amplitude_mode)
for (i = 0; i < dst[sb].num_wavs; i++)
ctx->waves_info->waves[dst[sb].start_index + i].amp_sf =
get_vlc2(gb, tone_vlc_tabs[3].table,
tone_vlc_tabs[3].bits, 1) + 20;
else
ctx->waves_info->waves[dst[sb].start_index].amp_sf =
get_vlc2(gb, tone_vlc_tabs[4].table,
tone_vlc_tabs[4].bits, 1) + 24;
}
break;
case 2: /** VLC modulo delta to master (slave only) */
for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) {
if (!band_has_tones[sb] || !dst[sb].num_wavs)
continue;
for (i = 0; i < dst[sb].num_wavs; i++) {
delta = get_vlc2(gb, tone_vlc_tabs[5].table,
tone_vlc_tabs[5].bits, 1);
delta = sign_extend(delta, 5);
pred = refwaves[dst[sb].start_index + i] >= 0 ?
ctx->waves_info->waves[refwaves[dst[sb].start_index + i]].amp_sf : 34;
ctx->waves_info->waves[dst[sb].start_index + i].amp_sf = (pred + delta) & 0x3F;
}
}
break;
case 3: /** clone master (slave only) */
for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) {
if (!band_has_tones[sb])
continue;
for (i = 0; i < dst[sb].num_wavs; i++)
ctx->waves_info->waves[dst[sb].start_index + i].amp_sf =
refwaves[dst[sb].start_index + i] >= 0
? ctx->waves_info->waves[refwaves[dst[sb].start_index + i]].amp_sf
: 32;
}
break;
}
}
/**
* Decode phase information for each subband of a channel.
*
* @param[in] gb the GetBit context
* @param[in,out] ctx ptr to the channel unit context
* @param[in] ch_num channel to process
* @param[in] band_has_tones ptr to an array of per-band-flags:
* 1 - tone data present
*/
static void decode_tones_phase(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
int ch_num, int band_has_tones[])
{
int sb, i;
Atrac3pWaveParam *wparam;
Atrac3pWavesData *dst = ctx->channels[ch_num].tones_info;
for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) {
if (!band_has_tones[sb])
continue;
wparam = &ctx->waves_info->waves[dst[sb].start_index];
for (i = 0; i < dst[sb].num_wavs; i++)
wparam[i].phase_index = get_bits(gb, 5);
}
}
/**
* Decode tones info for all channels.
*
* @param[in] gb the GetBit context
* @param[in,out] ctx ptr to the channel unit context
* @param[in] num_channels number of channels to process
* @param[in] avctx ptr to the AVCodecContext
* @return result code: 0 = OK, otherwise - error code
*/
static int decode_tones_info(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
int num_channels, AVCodecContext *avctx)
{
int ch_num, i, ret;
int band_has_tones[16];
for (ch_num = 0; ch_num < num_channels; ch_num++)
memset(ctx->channels[ch_num].tones_info, 0,
sizeof(*ctx->channels[ch_num].tones_info) * ATRAC3P_SUBBANDS);
ctx->waves_info->tones_present = get_bits1(gb);
if (!ctx->waves_info->tones_present)
return 0;
memset(ctx->waves_info->waves, 0, sizeof(ctx->waves_info->waves));
ctx->waves_info->amplitude_mode = get_bits1(gb);
if (!ctx->waves_info->amplitude_mode) {
avpriv_report_missing_feature(avctx, "GHA amplitude mode 0");
return AVERROR_PATCHWELCOME;
}
ctx->waves_info->num_tone_bands =
get_vlc2(gb, tone_vlc_tabs[0].table,
tone_vlc_tabs[0].bits, 1) + 1;
if (num_channels == 2) {
get_subband_flags(gb, ctx->waves_info->tone_sharing, ctx->waves_info->num_tone_bands);
get_subband_flags(gb, ctx->waves_info->tone_master, ctx->waves_info->num_tone_bands);
get_subband_flags(gb, ctx->waves_info->invert_phase, ctx->waves_info->num_tone_bands);
}
ctx->waves_info->tones_index = 0;
for (ch_num = 0; ch_num < num_channels; ch_num++) {
for (i = 0; i < ctx->waves_info->num_tone_bands; i++)
band_has_tones[i] = !ch_num ? 1 : !ctx->waves_info->tone_sharing[i];
decode_tones_envelope(gb, ctx, ch_num, band_has_tones);
if ((ret = decode_band_numwavs(gb, ctx, ch_num, band_has_tones,
avctx)) < 0)
return ret;
decode_tones_frequency(gb, ctx, ch_num, band_has_tones);
decode_tones_amplitude(gb, ctx, ch_num, band_has_tones);
decode_tones_phase(gb, ctx, ch_num, band_has_tones);
}
if (num_channels == 2) {
for (i = 0; i < ctx->waves_info->num_tone_bands; i++) {
if (ctx->waves_info->tone_sharing[i])
ctx->channels[1].tones_info[i] = ctx->channels[0].tones_info[i];
if (ctx->waves_info->tone_master[i])
FFSWAP(Atrac3pWavesData, ctx->channels[0].tones_info[i],
ctx->channels[1].tones_info[i]);
}
}
return 0;
}
int ff_atrac3p_decode_channel_unit(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
int num_channels, AVCodecContext *avctx)
{
int ret;
/* parse sound header */
ctx->num_quant_units = get_bits(gb, 5) + 1;
if (ctx->num_quant_units > 28 && ctx->num_quant_units < 32) {
av_log(avctx, AV_LOG_ERROR,
"Invalid number of quantization units: %d!\n",
ctx->num_quant_units);
return AVERROR_INVALIDDATA;
}
ctx->mute_flag = get_bits1(gb);
/* decode various sound parameters */
if ((ret = decode_quant_wordlen(gb, ctx, num_channels, avctx)) < 0)
return ret;
ctx->num_subbands = atrac3p_qu_to_subband[ctx->num_quant_units - 1] + 1;
ctx->num_coded_subbands = ctx->used_quant_units
? atrac3p_qu_to_subband[ctx->used_quant_units - 1] + 1
: 0;
if ((ret = decode_scale_factors(gb, ctx, num_channels, avctx)) < 0)
return ret;
if ((ret = decode_code_table_indexes(gb, ctx, num_channels, avctx)) < 0)
return ret;
decode_spectrum(gb, ctx, num_channels, avctx);
if (num_channels == 2) {
get_subband_flags(gb, ctx->swap_channels, ctx->num_coded_subbands);
get_subband_flags(gb, ctx->negate_coeffs, ctx->num_coded_subbands);
}
decode_window_shape(gb, ctx, num_channels);
if ((ret = decode_gainc_data(gb, ctx, num_channels, avctx)) < 0)
return ret;
if ((ret = decode_tones_info(gb, ctx, num_channels, avctx)) < 0)
return ret;
/* decode global noise info */
ctx->noise_present = get_bits1(gb);
if (ctx->noise_present) {
ctx->noise_level_index = get_bits(gb, 4);
ctx->noise_table_index = get_bits(gb, 4);
}
return 0;
}
Reference in New Issue View Git Blame Copy Permalink