/*
* TwinVQ decoder
* Copyright (c) 2009 Vitor Sessak
*
* 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 <math.h>
#include <stdint.h>
#include "libavutil/channel_layout.h"
#include "avcodec.h"
#include "get_bits.h"
#include "internal.h"
#include "twinvq.h"
#include "twinvq_data.h"
static const TwinVQModeTab mode_08_08 = {
{
{ 8, bark_tab_s08_64, 10, tab.fcb08s, 1, 5, tab.cb0808s0, tab.cb0808s1, 18 },
{ 2, bark_tab_m08_256, 20, tab.fcb08m, 2, 5, tab.cb0808m0, tab.cb0808m1, 16 },
{ 1, bark_tab_l08_512, 30, tab.fcb08l, 3, 6, tab.cb0808l0, tab.cb0808l1, 17 }
},
512, 12, tab.lsp08, 1, 5, 3, 3, tab.shape08, 8, 28, 20, 6, 40
};
static const TwinVQModeTab mode_11_08 = {
{
{ 8, bark_tab_s11_64, 10, tab.fcb11s, 1, 5, tab.cb1108s0, tab.cb1108s1, 29 },
{ 2, bark_tab_m11_256, 20, tab.fcb11m, 2, 5, tab.cb1108m0, tab.cb1108m1, 24 },
{ 1, bark_tab_l11_512, 30, tab.fcb11l, 3, 6, tab.cb1108l0, tab.cb1108l1, 27 }
},
512, 16, tab.lsp11, 1, 6, 4, 3, tab.shape11, 9, 36, 30, 7, 90
};
static const TwinVQModeTab mode_11_10 = {
{
{ 8, bark_tab_s11_64, 10, tab.fcb11s, 1, 5, tab.cb1110s0, tab.cb1110s1, 21 },
{ 2, bark_tab_m11_256, 20, tab.fcb11m, 2, 5, tab.cb1110m0, tab.cb1110m1, 18 },
{ 1, bark_tab_l11_512, 30, tab.fcb11l, 3, 6, tab.cb1110l0, tab.cb1110l1, 20 }
},
512, 16, tab.lsp11, 1, 6, 4, 3, tab.shape11, 9, 36, 30, 7, 90
};
static const TwinVQModeTab mode_16_16 = {
{
{ 8, bark_tab_s16_128, 10, tab.fcb16s, 1, 5, tab.cb1616s0, tab.cb1616s1, 16 },
{ 2, bark_tab_m16_512, 20, tab.fcb16m, 2, 5, tab.cb1616m0, tab.cb1616m1, 15 },
{ 1, bark_tab_l16_1024, 30, tab.fcb16l, 3, 6, tab.cb1616l0, tab.cb1616l1, 16 }
},
1024, 16, tab.lsp16, 1, 6, 4, 3, tab.shape16, 9, 56, 60, 7, 180
};
static const TwinVQModeTab mode_22_20 = {
{
{ 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2220s0, tab.cb2220s1, 18 },
{ 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2220m0, tab.cb2220m1, 17 },
{ 1, bark_tab_l22_1024, 32, tab.fcb22l_1, 4, 6, tab.cb2220l0, tab.cb2220l1, 18 }
},
1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144
};
static const TwinVQModeTab mode_22_24 = {
{
{ 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2224s0, tab.cb2224s1, 15 },
{ 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2224m0, tab.cb2224m1, 14 },
{ 1, bark_tab_l22_1024, 32, tab.fcb22l_1, 4, 6, tab.cb2224l0, tab.cb2224l1, 15 }
},
1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144
};
static const TwinVQModeTab mode_22_32 = {
{
{ 4, bark_tab_s22_128, 10, tab.fcb22s_2, 1, 6, tab.cb2232s0, tab.cb2232s1, 11 },
{ 2, bark_tab_m22_256, 20, tab.fcb22m_2, 2, 6, tab.cb2232m0, tab.cb2232m1, 11 },
{ 1, bark_tab_l22_512, 32, tab.fcb22l_2, 4, 6, tab.cb2232l0, tab.cb2232l1, 12 }
},
512, 16, tab.lsp22_2, 1, 6, 4, 4, tab.shape22_2, 9, 56, 36, 7, 72
};
static const TwinVQModeTab mode_44_40 = {
{
{ 16, bark_tab_s44_128, 10, tab.fcb44s, 1, 6, tab.cb4440s0, tab.cb4440s1, 18 },
{ 4, bark_tab_m44_512, 20, tab.fcb44m, 2, 6, tab.cb4440m0, tab.cb4440m1, 17 },
{ 1, bark_tab_l44_2048, 40, tab.fcb44l, 4, 6, tab.cb4440l0, tab.cb4440l1, 17 }
},
2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44, 9, 84, 54, 7, 432
};
static const TwinVQModeTab mode_44_48 = {
{
{ 16, bark_tab_s44_128, 10, tab.fcb44s, 1, 6, tab.cb4448s0, tab.cb4448s1, 15 },
{ 4, bark_tab_m44_512, 20, tab.fcb44m, 2, 6, tab.cb4448m0, tab.cb4448m1, 14 },
{ 1, bark_tab_l44_2048, 40, tab.fcb44l, 4, 6, tab.cb4448l0, tab.cb4448l1, 14 }
},
2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44, 9, 84, 54, 7, 432
};
/**
* Evaluate a * b / 400 rounded to the nearest integer. When, for example,
* a * b == 200 and the nearest integer is ill-defined, use a table to emulate
* the following broken float-based implementation used by the binary decoder:
*
* @code
* static int very_broken_op(int a, int b)
* {
* static float test; // Ugh, force gcc to do the division first...
*
* test = a / 400.0;
* return b * test + 0.5;
* }
* @endcode
*
* @note if this function is replaced by just ROUNDED_DIV(a * b, 400.0), the
* stddev between the original file (before encoding with Yamaha encoder) and
* the decoded output increases, which leads one to believe that the encoder
* expects exactly this broken calculation.
*/
static int very_broken_op(int a, int b)
{
int x = a * b + 200;
int size;
const uint8_t *rtab;
if (x % 400 || b % 5)
return x / 400;
x /= 400;
size = tabs[b / 5].size;
rtab = tabs[b / 5].tab;
return x - rtab[size * av_log2(2 * (x - 1) / size) + (x - 1) % size];
}
/**
* Sum to data a periodic peak of a given period, width and shape.
*
* @param period the period of the peak divised by 400.0
*/
static void add_peak(int period, int width, const float *shape,
float ppc_gain, float *speech, int len)
{
int i, j;
const float *shape_end = shape + len;
int center;
// First peak centered around zero
for (i = 0; i < width / 2; i++)
speech[i] += ppc_gain * *shape++;
for (i = 1; i < ROUNDED_DIV(len, width); i++) {
center = very_broken_op(period, i);
for (j = -width / 2; j < (width + 1) / 2; j++)
speech[j + center] += ppc_gain * *shape++;
}
// For the last block, be careful not to go beyond the end of the buffer
center = very_broken_op(period, i);
for (j = -width / 2; j < (width + 1) / 2 && shape < shape_end; j++)
speech[j + center] += ppc_gain * *shape++;
}
static void decode_ppc(TwinVQContext *tctx, int period_coef, int g_coef,
const float *shape, float *speech)
{
const TwinVQModeTab *mtab = tctx->mtab;
int isampf = tctx->avctx->sample_rate / 1000;
int ibps = tctx->avctx->bit_rate / (1000 * tctx->avctx->channels);
int min_period = ROUNDED_DIV(40 * 2 * mtab->size, isampf);
int max_period = ROUNDED_DIV(40 * 2 * mtab->size * 6, isampf);
int period_range = max_period - min_period;
float pgain_step = 25000.0 / ((1 << mtab->pgain_bit) - 1);
float ppc_gain = 1.0 / 8192 *
twinvq_mulawinv(pgain_step * g_coef +
pgain_step / 2,
25000.0, TWINVQ_PGAIN_MU);
// This is actually the period multiplied by 400. It is just linearly coded
// between its maximum and minimum value.
int period = min_period +
ROUNDED_DIV(period_coef * period_range,
(1 << mtab->ppc_period_bit) - 1);
int width;
if (isampf == 22 && ibps == 32) {
// For some unknown reason, NTT decided to code this case differently...
width = ROUNDED_DIV((period + 800) * mtab->peak_per2wid,
400 * mtab->size);
} else
width = period * mtab->peak_per2wid / (400 * mtab->size);
add_peak(period, width, shape, ppc_gain, speech, mtab->ppc_shape_len);
}
static void dec_bark_env(TwinVQContext *tctx, const uint8_t *in, int use_hist,
int ch, float *out, float gain,
enum TwinVQFrameType ftype)
{
const TwinVQModeTab *mtab = tctx->mtab;
int i, j;
float *hist = tctx->bark_hist[ftype][ch];
float val = ((const float []) { 0.4, 0.35, 0.28 })[ftype];
int bark_n_coef = mtab->fmode[ftype].bark_n_coef;
int fw_cb_len = mtab->fmode[ftype].bark_env_size / bark_n_coef;
int idx = 0;
for (i = 0; i < fw_cb_len; i++)
for (j = 0; j < bark_n_coef; j++, idx++) {
float tmp2 = mtab->fmode[ftype].bark_cb[fw_cb_len * in[j] + i] *
(1.0 / 4096);
float st = use_hist ? (1.0 - val) * tmp2 + val * hist[idx] + 1.0
: tmp2 + 1.0;
hist[idx] = tmp2;
if (st < -1.0)
st = 1.0;
twinvq_memset_float(out, st * gain, mtab->fmode[ftype].bark_tab[idx]);
out += mtab->fmode[ftype].bark_tab[idx];
}
}
static void read_cb_data(TwinVQContext *tctx, GetBitContext *gb,
uint8_t *dst, enum TwinVQFrameType ftype)
{
int i;
for (i = 0; i < tctx->n_div[ftype]; i++) {
int bs_second_part = (i >= tctx->bits_main_spec_change[ftype]);
*dst++ = get_bits(gb, tctx->bits_main_spec[0][ftype][bs_second_part]);
*dst++ = get_bits(gb, tctx->bits_main_spec[1][ftype][bs_second_part]);
}
}
static int twinvq_read_bitstream(AVCodecContext *avctx, TwinVQContext *tctx,
const uint8_t *buf, int buf_size)
{
TwinVQFrameData *bits = &tctx->bits;
const TwinVQModeTab *mtab = tctx->mtab;
int channels = tctx->avctx->channels;
int sub;
GetBitContext gb;
int i, j, k;
init_get_bits(&gb, buf, buf_size * 8);
skip_bits(&gb, get_bits(&gb, 8));
bits->window_type = get_bits(&gb, TWINVQ_WINDOW_TYPE_BITS);
if (bits->window_type > 8) {
av_log(avctx, AV_LOG_ERROR, "Invalid window type, broken sample?\n");
return AVERROR_INVALIDDATA;
}
bits->ftype = ff_twinvq_wtype_to_ftype_table[tctx->bits.window_type];
sub = mtab->fmode[bits->ftype].sub;
read_cb_data(tctx, &gb, bits->main_coeffs, bits->ftype);
for (i = 0; i < channels; i++)
for (j = 0; j < sub; j++)
for (k = 0; k < mtab->fmode[bits->ftype].bark_n_coef; k++)
bits->bark1[i][j][k] =
get_bits(&gb, mtab->fmode[bits->ftype].bark_n_bit);
for (i = 0; i < channels; i++)
for (j = 0; j < sub; j++)
bits->bark_use_hist[i][j] = get_bits1(&gb);
if (bits->ftype == TWINVQ_FT_LONG) {
for (i = 0; i < channels; i++)
bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS);
} else {
for (i = 0; i < channels; i++) {
bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS);
for (j = 0; j < sub; j++)
bits->sub_gain_bits[i * sub + j] = get_bits(&gb,
TWINVQ_SUB_GAIN_BITS);
}
}
for (i = 0; i < channels; i++) {
bits->lpc_hist_idx[i] = get_bits(&gb, mtab->lsp_bit0);
bits->lpc_idx1[i] = get_bits(&gb, mtab->lsp_bit1);
for (j = 0; j < mtab->lsp_split; j++)
bits->lpc_idx2[i][j] = get_bits(&gb, mtab->lsp_bit2);
}
if (bits->ftype == TWINVQ_FT_LONG) {
read_cb_data(tctx, &gb, bits->ppc_coeffs, 3);
for (i = 0; i < channels; i++) {
bits->p_coef[i] = get_bits(&gb, mtab->ppc_period_bit);
bits->g_coef[i] = get_bits(&gb, mtab->pgain_bit);
}
}
return (get_bits_count(&gb) + 7) / 8;
}
static av_cold int twinvq_decode_init(AVCodecContext *avctx)
{
int isampf, ibps;
TwinVQContext *tctx = avctx->priv_data;
if (!avctx->extradata || avctx->extradata_size < 12) {
av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata\n");
return AVERROR_INVALIDDATA;
}
avctx->channels = AV_RB32(avctx->extradata) + 1;
avctx->bit_rate = AV_RB32(avctx->extradata + 4) * 1000;
isampf = AV_RB32(avctx->extradata + 8);
if (isampf < 8 || isampf > 44) {
av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate\n");
return AVERROR_INVALIDDATA;
}
switch (isampf) {
case 44:
avctx->sample_rate = 44100;
break;
case 22:
avctx->sample_rate = 22050;
break;
case 11:
avctx->sample_rate = 11025;
break;
default:
avctx->sample_rate = isampf * 1000;
break;
}
if (avctx->channels <= 0 || avctx->channels > TWINVQ_CHANNELS_MAX) {
av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %i\n",
avctx->channels);
return -1;
}
avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO
: AV_CH_LAYOUT_STEREO;
ibps = avctx->bit_rate / (1000 * avctx->channels);
if (ibps < 8 || ibps > 48) {
av_log(avctx, AV_LOG_ERROR, "Bad bitrate per channel value %d\n", ibps);
return AVERROR_INVALIDDATA;
}
switch ((isampf << 8) + ibps) {
case (8 << 8) + 8:
tctx->mtab = &mode_08_08;
break;
case (11 << 8) + 8:
tctx->mtab = &mode_11_08;
break;
case (11 << 8) + 10:
tctx->mtab = &mode_11_10;
break;
case (16 << 8) + 16:
tctx->mtab = &mode_16_16;
break;
case (22 << 8) + 20:
tctx->mtab = &mode_22_20;
break;
case (22 << 8) + 24:
tctx->mtab = &mode_22_24;
break;
case (22 << 8) + 32:
tctx->mtab = &mode_22_32;
break;
case (44 << 8) + 40:
tctx->mtab = &mode_44_40;
break;
case (44 << 8) + 48:
tctx->mtab = &mode_44_48;
break;
default:
av_log(avctx, AV_LOG_ERROR,
"This version does not support %d kHz - %d kbit/s/ch mode.\n",
isampf, isampf);
return -1;
}
avctx->block_align = (avctx->bit_rate * tctx->mtab->size
/ avctx->sample_rate + 15) / 8;
tctx->codec = TWINVQ_CODEC_VQF;
tctx->read_bitstream = twinvq_read_bitstream;
tctx->dec_bark_env = dec_bark_env;
tctx->decode_ppc = decode_ppc;
return ff_twinvq_decode_init(avctx);
}
AVCodec ff_twinvq_decoder = {
.name = "twinvq",
.long_name = NULL_IF_CONFIG_SMALL("VQF TwinVQ"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_TWINVQ,
.priv_data_size = sizeof(TwinVQContext),
.init = twinvq_decode_init,
.close = ff_twinvq_decode_close,
.decode = ff_twinvq_decode_frame,
.capabilities = CODEC_CAP_DR1,
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
AV_SAMPLE_FMT_NONE },
};