811 lines
27 KiB
C
Executable file
811 lines
27 KiB
C
Executable file
/*
|
|
* 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 "libavutil/float_dsp.h"
|
|
#include "avcodec.h"
|
|
#include "fft.h"
|
|
#include "internal.h"
|
|
#include "lsp.h"
|
|
#include "sinewin.h"
|
|
#include "twinvq.h"
|
|
|
|
/**
|
|
* Evaluate a single LPC amplitude spectrum envelope coefficient from the line
|
|
* spectrum pairs.
|
|
*
|
|
* @param lsp a vector of the cosine of the LSP values
|
|
* @param cos_val cos(PI*i/N) where i is the index of the LPC amplitude
|
|
* @param order the order of the LSP (and the size of the *lsp buffer). Must
|
|
* be a multiple of four.
|
|
* @return the LPC value
|
|
*
|
|
* @todo reuse code from Vorbis decoder: vorbis_floor0_decode
|
|
*/
|
|
static float eval_lpc_spectrum(const float *lsp, float cos_val, int order)
|
|
{
|
|
int j;
|
|
float p = 0.5f;
|
|
float q = 0.5f;
|
|
float two_cos_w = 2.0f * cos_val;
|
|
|
|
for (j = 0; j + 1 < order; j += 2 * 2) {
|
|
// Unroll the loop once since order is a multiple of four
|
|
q *= lsp[j] - two_cos_w;
|
|
p *= lsp[j + 1] - two_cos_w;
|
|
|
|
q *= lsp[j + 2] - two_cos_w;
|
|
p *= lsp[j + 3] - two_cos_w;
|
|
}
|
|
|
|
p *= p * (2.0f - two_cos_w);
|
|
q *= q * (2.0f + two_cos_w);
|
|
|
|
return 0.5 / (p + q);
|
|
}
|
|
|
|
/**
|
|
* Evaluate the LPC amplitude spectrum envelope from the line spectrum pairs.
|
|
*/
|
|
static void eval_lpcenv(TwinVQContext *tctx, const float *cos_vals, float *lpc)
|
|
{
|
|
int i;
|
|
const TwinVQModeTab *mtab = tctx->mtab;
|
|
int size_s = mtab->size / mtab->fmode[TWINVQ_FT_SHORT].sub;
|
|
|
|
for (i = 0; i < size_s / 2; i++) {
|
|
float cos_i = tctx->cos_tabs[0][i];
|
|
lpc[i] = eval_lpc_spectrum(cos_vals, cos_i, mtab->n_lsp);
|
|
lpc[size_s - i - 1] = eval_lpc_spectrum(cos_vals, -cos_i, mtab->n_lsp);
|
|
}
|
|
}
|
|
|
|
static void interpolate(float *out, float v1, float v2, int size)
|
|
{
|
|
int i;
|
|
float step = (v1 - v2) / (size + 1);
|
|
|
|
for (i = 0; i < size; i++) {
|
|
v2 += step;
|
|
out[i] = v2;
|
|
}
|
|
}
|
|
|
|
static inline float get_cos(int idx, int part, const float *cos_tab, int size)
|
|
{
|
|
return part ? -cos_tab[size - idx - 1]
|
|
: cos_tab[idx];
|
|
}
|
|
|
|
/**
|
|
* Evaluate the LPC amplitude spectrum envelope from the line spectrum pairs.
|
|
* Probably for speed reasons, the coefficients are evaluated as
|
|
* siiiibiiiisiiiibiiiisiiiibiiiisiiiibiiiis ...
|
|
* where s is an evaluated value, i is a value interpolated from the others
|
|
* and b might be either calculated or interpolated, depending on an
|
|
* unexplained condition.
|
|
*
|
|
* @param step the size of a block "siiiibiiii"
|
|
* @param in the cosine of the LSP data
|
|
* @param part is 0 for 0...PI (positive cosine values) and 1 for PI...2PI
|
|
* (negative cosine values)
|
|
* @param size the size of the whole output
|
|
*/
|
|
static inline void eval_lpcenv_or_interp(TwinVQContext *tctx,
|
|
enum TwinVQFrameType ftype,
|
|
float *out, const float *in,
|
|
int size, int step, int part)
|
|
{
|
|
int i;
|
|
const TwinVQModeTab *mtab = tctx->mtab;
|
|
const float *cos_tab = tctx->cos_tabs[ftype];
|
|
|
|
// Fill the 's'
|
|
for (i = 0; i < size; i += step)
|
|
out[i] =
|
|
eval_lpc_spectrum(in,
|
|
get_cos(i, part, cos_tab, size),
|
|
mtab->n_lsp);
|
|
|
|
// Fill the 'iiiibiiii'
|
|
for (i = step; i <= size - 2 * step; i += step) {
|
|
if (out[i + step] + out[i - step] > 1.95 * out[i] ||
|
|
out[i + step] >= out[i - step]) {
|
|
interpolate(out + i - step + 1, out[i], out[i - step], step - 1);
|
|
} else {
|
|
out[i - step / 2] =
|
|
eval_lpc_spectrum(in,
|
|
get_cos(i - step / 2, part, cos_tab, size),
|
|
mtab->n_lsp);
|
|
interpolate(out + i - step + 1, out[i - step / 2],
|
|
out[i - step], step / 2 - 1);
|
|
interpolate(out + i - step / 2 + 1, out[i],
|
|
out[i - step / 2], step / 2 - 1);
|
|
}
|
|
}
|
|
|
|
interpolate(out + size - 2 * step + 1, out[size - step],
|
|
out[size - 2 * step], step - 1);
|
|
}
|
|
|
|
static void eval_lpcenv_2parts(TwinVQContext *tctx, enum TwinVQFrameType ftype,
|
|
const float *buf, float *lpc,
|
|
int size, int step)
|
|
{
|
|
eval_lpcenv_or_interp(tctx, ftype, lpc, buf, size / 2, step, 0);
|
|
eval_lpcenv_or_interp(tctx, ftype, lpc + size / 2, buf, size / 2,
|
|
2 * step, 1);
|
|
|
|
interpolate(lpc + size / 2 - step + 1, lpc[size / 2],
|
|
lpc[size / 2 - step], step);
|
|
|
|
twinvq_memset_float(lpc + size - 2 * step + 1, lpc[size - 2 * step],
|
|
2 * step - 1);
|
|
}
|
|
|
|
/**
|
|
* Inverse quantization. Read CB coefficients for cb1 and cb2 from the
|
|
* bitstream, sum the corresponding vectors and write the result to *out
|
|
* after permutation.
|
|
*/
|
|
static void dequant(TwinVQContext *tctx, const uint8_t *cb_bits, float *out,
|
|
enum TwinVQFrameType ftype,
|
|
const int16_t *cb0, const int16_t *cb1, int cb_len)
|
|
{
|
|
int pos = 0;
|
|
int i, j;
|
|
|
|
for (i = 0; i < tctx->n_div[ftype]; i++) {
|
|
int tmp0, tmp1;
|
|
int sign0 = 1;
|
|
int sign1 = 1;
|
|
const int16_t *tab0, *tab1;
|
|
int length = tctx->length[ftype][i >= tctx->length_change[ftype]];
|
|
int bitstream_second_part = (i >= tctx->bits_main_spec_change[ftype]);
|
|
|
|
int bits = tctx->bits_main_spec[0][ftype][bitstream_second_part];
|
|
tmp0 = *cb_bits++;
|
|
if (bits == 7) {
|
|
if (tmp0 & 0x40)
|
|
sign0 = -1;
|
|
tmp0 &= 0x3F;
|
|
}
|
|
|
|
bits = tctx->bits_main_spec[1][ftype][bitstream_second_part];
|
|
tmp1 = *cb_bits++;
|
|
if (bits == 7) {
|
|
if (tmp1 & 0x40)
|
|
sign1 = -1;
|
|
tmp1 &= 0x3F;
|
|
}
|
|
|
|
tab0 = cb0 + tmp0 * cb_len;
|
|
tab1 = cb1 + tmp1 * cb_len;
|
|
|
|
for (j = 0; j < length; j++)
|
|
out[tctx->permut[ftype][pos + j]] = sign0 * tab0[j] +
|
|
sign1 * tab1[j];
|
|
|
|
pos += length;
|
|
}
|
|
}
|
|
|
|
static void dec_gain(TwinVQContext *tctx,
|
|
enum TwinVQFrameType ftype, float *out)
|
|
{
|
|
const TwinVQModeTab *mtab = tctx->mtab;
|
|
const TwinVQFrameData *bits = &tctx->bits[tctx->cur_frame];
|
|
int i, j;
|
|
int sub = mtab->fmode[ftype].sub;
|
|
float step = TWINVQ_AMP_MAX / ((1 << TWINVQ_GAIN_BITS) - 1);
|
|
float sub_step = TWINVQ_SUB_AMP_MAX / ((1 << TWINVQ_SUB_GAIN_BITS) - 1);
|
|
|
|
if (ftype == TWINVQ_FT_LONG) {
|
|
for (i = 0; i < tctx->avctx->channels; i++)
|
|
out[i] = (1.0 / (1 << 13)) *
|
|
twinvq_mulawinv(step * 0.5 + step * bits->gain_bits[i],
|
|
TWINVQ_AMP_MAX, TWINVQ_MULAW_MU);
|
|
} else {
|
|
for (i = 0; i < tctx->avctx->channels; i++) {
|
|
float val = (1.0 / (1 << 23)) *
|
|
twinvq_mulawinv(step * 0.5 + step * bits->gain_bits[i],
|
|
TWINVQ_AMP_MAX, TWINVQ_MULAW_MU);
|
|
|
|
for (j = 0; j < sub; j++)
|
|
out[i * sub + j] =
|
|
val * twinvq_mulawinv(sub_step * 0.5 +
|
|
sub_step * bits->sub_gain_bits[i * sub + j],
|
|
TWINVQ_SUB_AMP_MAX, TWINVQ_MULAW_MU);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Rearrange the LSP coefficients so that they have a minimum distance of
|
|
* min_dist. This function does it exactly as described in section of 3.2.4
|
|
* of the G.729 specification (but interestingly is different from what the
|
|
* reference decoder actually does).
|
|
*/
|
|
static void rearrange_lsp(int order, float *lsp, float min_dist)
|
|
{
|
|
int i;
|
|
float min_dist2 = min_dist * 0.5;
|
|
for (i = 1; i < order; i++)
|
|
if (lsp[i] - lsp[i - 1] < min_dist) {
|
|
float avg = (lsp[i] + lsp[i - 1]) * 0.5;
|
|
|
|
lsp[i - 1] = avg - min_dist2;
|
|
lsp[i] = avg + min_dist2;
|
|
}
|
|
}
|
|
|
|
static void decode_lsp(TwinVQContext *tctx, int lpc_idx1, uint8_t *lpc_idx2,
|
|
int lpc_hist_idx, float *lsp, float *hist)
|
|
{
|
|
const TwinVQModeTab *mtab = tctx->mtab;
|
|
int i, j;
|
|
|
|
const float *cb = mtab->lspcodebook;
|
|
const float *cb2 = cb + (1 << mtab->lsp_bit1) * mtab->n_lsp;
|
|
const float *cb3 = cb2 + (1 << mtab->lsp_bit2) * mtab->n_lsp;
|
|
|
|
const int8_t funny_rounding[4] = {
|
|
-2,
|
|
mtab->lsp_split == 4 ? -2 : 1,
|
|
mtab->lsp_split == 4 ? -2 : 1,
|
|
0
|
|
};
|
|
|
|
j = 0;
|
|
for (i = 0; i < mtab->lsp_split; i++) {
|
|
int chunk_end = ((i + 1) * mtab->n_lsp + funny_rounding[i]) /
|
|
mtab->lsp_split;
|
|
for (; j < chunk_end; j++)
|
|
lsp[j] = cb[lpc_idx1 * mtab->n_lsp + j] +
|
|
cb2[lpc_idx2[i] * mtab->n_lsp + j];
|
|
}
|
|
|
|
rearrange_lsp(mtab->n_lsp, lsp, 0.0001);
|
|
|
|
for (i = 0; i < mtab->n_lsp; i++) {
|
|
float tmp1 = 1.0 - cb3[lpc_hist_idx * mtab->n_lsp + i];
|
|
float tmp2 = hist[i] * cb3[lpc_hist_idx * mtab->n_lsp + i];
|
|
hist[i] = lsp[i];
|
|
lsp[i] = lsp[i] * tmp1 + tmp2;
|
|
}
|
|
|
|
rearrange_lsp(mtab->n_lsp, lsp, 0.0001);
|
|
rearrange_lsp(mtab->n_lsp, lsp, 0.000095);
|
|
ff_sort_nearly_sorted_floats(lsp, mtab->n_lsp);
|
|
}
|
|
|
|
static void dec_lpc_spectrum_inv(TwinVQContext *tctx, float *lsp,
|
|
enum TwinVQFrameType ftype, float *lpc)
|
|
{
|
|
int i;
|
|
int size = tctx->mtab->size / tctx->mtab->fmode[ftype].sub;
|
|
|
|
for (i = 0; i < tctx->mtab->n_lsp; i++)
|
|
lsp[i] = 2 * cos(lsp[i]);
|
|
|
|
switch (ftype) {
|
|
case TWINVQ_FT_LONG:
|
|
eval_lpcenv_2parts(tctx, ftype, lsp, lpc, size, 8);
|
|
break;
|
|
case TWINVQ_FT_MEDIUM:
|
|
eval_lpcenv_2parts(tctx, ftype, lsp, lpc, size, 2);
|
|
break;
|
|
case TWINVQ_FT_SHORT:
|
|
eval_lpcenv(tctx, lsp, lpc);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static const uint8_t wtype_to_wsize[] = { 0, 0, 2, 2, 2, 1, 0, 1, 1 };
|
|
|
|
static void imdct_and_window(TwinVQContext *tctx, enum TwinVQFrameType ftype,
|
|
int wtype, float *in, float *prev, int ch)
|
|
{
|
|
FFTContext *mdct = &tctx->mdct_ctx[ftype];
|
|
const TwinVQModeTab *mtab = tctx->mtab;
|
|
int bsize = mtab->size / mtab->fmode[ftype].sub;
|
|
int size = mtab->size;
|
|
float *buf1 = tctx->tmp_buf;
|
|
int j, first_wsize, wsize; // Window size
|
|
float *out = tctx->curr_frame + 2 * ch * mtab->size;
|
|
float *out2 = out;
|
|
float *prev_buf;
|
|
int types_sizes[] = {
|
|
mtab->size / mtab->fmode[TWINVQ_FT_LONG].sub,
|
|
mtab->size / mtab->fmode[TWINVQ_FT_MEDIUM].sub,
|
|
mtab->size / (mtab->fmode[TWINVQ_FT_SHORT].sub * 2),
|
|
};
|
|
|
|
wsize = types_sizes[wtype_to_wsize[wtype]];
|
|
first_wsize = wsize;
|
|
prev_buf = prev + (size - bsize) / 2;
|
|
|
|
for (j = 0; j < mtab->fmode[ftype].sub; j++) {
|
|
int sub_wtype = ftype == TWINVQ_FT_MEDIUM ? 8 : wtype;
|
|
|
|
if (!j && wtype == 4)
|
|
sub_wtype = 4;
|
|
else if (j == mtab->fmode[ftype].sub - 1 && wtype == 7)
|
|
sub_wtype = 7;
|
|
|
|
wsize = types_sizes[wtype_to_wsize[sub_wtype]];
|
|
|
|
mdct->imdct_half(mdct, buf1 + bsize * j, in + bsize * j);
|
|
|
|
tctx->fdsp->vector_fmul_window(out2, prev_buf + (bsize - wsize) / 2,
|
|
buf1 + bsize * j,
|
|
ff_sine_windows[av_log2(wsize)],
|
|
wsize / 2);
|
|
out2 += wsize;
|
|
|
|
memcpy(out2, buf1 + bsize * j + wsize / 2,
|
|
(bsize - wsize / 2) * sizeof(float));
|
|
|
|
out2 += ftype == TWINVQ_FT_MEDIUM ? (bsize - wsize) / 2 : bsize - wsize;
|
|
|
|
prev_buf = buf1 + bsize * j + bsize / 2;
|
|
}
|
|
|
|
tctx->last_block_pos[ch] = (size + first_wsize) / 2;
|
|
}
|
|
|
|
static void imdct_output(TwinVQContext *tctx, enum TwinVQFrameType ftype,
|
|
int wtype, float **out, int offset)
|
|
{
|
|
const TwinVQModeTab *mtab = tctx->mtab;
|
|
float *prev_buf = tctx->prev_frame + tctx->last_block_pos[0];
|
|
int size1, size2, i;
|
|
float *out1, *out2;
|
|
|
|
for (i = 0; i < tctx->avctx->channels; i++)
|
|
imdct_and_window(tctx, ftype, wtype,
|
|
tctx->spectrum + i * mtab->size,
|
|
prev_buf + 2 * i * mtab->size,
|
|
i);
|
|
|
|
if (!out)
|
|
return;
|
|
|
|
size2 = tctx->last_block_pos[0];
|
|
size1 = mtab->size - size2;
|
|
|
|
out1 = &out[0][0] + offset;
|
|
memcpy(out1, prev_buf, size1 * sizeof(*out1));
|
|
memcpy(out1 + size1, tctx->curr_frame, size2 * sizeof(*out1));
|
|
|
|
if (tctx->avctx->channels == 2) {
|
|
out2 = &out[1][0] + offset;
|
|
memcpy(out2, &prev_buf[2 * mtab->size],
|
|
size1 * sizeof(*out2));
|
|
memcpy(out2 + size1, &tctx->curr_frame[2 * mtab->size],
|
|
size2 * sizeof(*out2));
|
|
tctx->fdsp->butterflies_float(out1, out2, mtab->size);
|
|
}
|
|
}
|
|
|
|
static void read_and_decode_spectrum(TwinVQContext *tctx, float *out,
|
|
enum TwinVQFrameType ftype)
|
|
{
|
|
const TwinVQModeTab *mtab = tctx->mtab;
|
|
TwinVQFrameData *bits = &tctx->bits[tctx->cur_frame];
|
|
int channels = tctx->avctx->channels;
|
|
int sub = mtab->fmode[ftype].sub;
|
|
int block_size = mtab->size / sub;
|
|
float gain[TWINVQ_CHANNELS_MAX * TWINVQ_SUBBLOCKS_MAX];
|
|
float ppc_shape[TWINVQ_PPC_SHAPE_LEN_MAX * TWINVQ_CHANNELS_MAX * 4];
|
|
|
|
int i, j;
|
|
|
|
dequant(tctx, bits->main_coeffs, out, ftype,
|
|
mtab->fmode[ftype].cb0, mtab->fmode[ftype].cb1,
|
|
mtab->fmode[ftype].cb_len_read);
|
|
|
|
dec_gain(tctx, ftype, gain);
|
|
|
|
if (ftype == TWINVQ_FT_LONG) {
|
|
int cb_len_p = (tctx->n_div[3] + mtab->ppc_shape_len * channels - 1) /
|
|
tctx->n_div[3];
|
|
dequant(tctx, bits->ppc_coeffs, ppc_shape,
|
|
TWINVQ_FT_PPC, mtab->ppc_shape_cb,
|
|
mtab->ppc_shape_cb + cb_len_p * TWINVQ_PPC_SHAPE_CB_SIZE,
|
|
cb_len_p);
|
|
}
|
|
|
|
for (i = 0; i < channels; i++) {
|
|
float *chunk = out + mtab->size * i;
|
|
float lsp[TWINVQ_LSP_COEFS_MAX];
|
|
|
|
for (j = 0; j < sub; j++) {
|
|
tctx->dec_bark_env(tctx, bits->bark1[i][j],
|
|
bits->bark_use_hist[i][j], i,
|
|
tctx->tmp_buf, gain[sub * i + j], ftype);
|
|
|
|
tctx->fdsp->vector_fmul(chunk + block_size * j,
|
|
chunk + block_size * j,
|
|
tctx->tmp_buf, block_size);
|
|
}
|
|
|
|
if (ftype == TWINVQ_FT_LONG)
|
|
tctx->decode_ppc(tctx, bits->p_coef[i], bits->g_coef[i],
|
|
ppc_shape + i * mtab->ppc_shape_len, chunk);
|
|
|
|
decode_lsp(tctx, bits->lpc_idx1[i], bits->lpc_idx2[i],
|
|
bits->lpc_hist_idx[i], lsp, tctx->lsp_hist[i]);
|
|
|
|
dec_lpc_spectrum_inv(tctx, lsp, ftype, tctx->tmp_buf);
|
|
|
|
for (j = 0; j < mtab->fmode[ftype].sub; j++) {
|
|
tctx->fdsp->vector_fmul(chunk, chunk, tctx->tmp_buf, block_size);
|
|
chunk += block_size;
|
|
}
|
|
}
|
|
}
|
|
|
|
const enum TwinVQFrameType ff_twinvq_wtype_to_ftype_table[] = {
|
|
TWINVQ_FT_LONG, TWINVQ_FT_LONG, TWINVQ_FT_SHORT, TWINVQ_FT_LONG,
|
|
TWINVQ_FT_MEDIUM, TWINVQ_FT_LONG, TWINVQ_FT_LONG, TWINVQ_FT_MEDIUM,
|
|
TWINVQ_FT_MEDIUM
|
|
};
|
|
|
|
int ff_twinvq_decode_frame(AVCodecContext *avctx, void *data,
|
|
int *got_frame_ptr, AVPacket *avpkt)
|
|
{
|
|
AVFrame *frame = data;
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
TwinVQContext *tctx = avctx->priv_data;
|
|
const TwinVQModeTab *mtab = tctx->mtab;
|
|
float **out = NULL;
|
|
int ret;
|
|
|
|
/* get output buffer */
|
|
if (tctx->discarded_packets >= 2) {
|
|
frame->nb_samples = mtab->size * tctx->frames_per_packet;
|
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
|
|
return ret;
|
|
out = (float **)frame->extended_data;
|
|
}
|
|
|
|
if (buf_size < avctx->block_align) {
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"Frame too small (%d bytes). Truncated file?\n", buf_size);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
if ((ret = tctx->read_bitstream(avctx, tctx, buf, buf_size)) < 0)
|
|
return ret;
|
|
|
|
for (tctx->cur_frame = 0; tctx->cur_frame < tctx->frames_per_packet;
|
|
tctx->cur_frame++) {
|
|
read_and_decode_spectrum(tctx, tctx->spectrum,
|
|
tctx->bits[tctx->cur_frame].ftype);
|
|
|
|
imdct_output(tctx, tctx->bits[tctx->cur_frame].ftype,
|
|
tctx->bits[tctx->cur_frame].window_type, out,
|
|
tctx->cur_frame * mtab->size);
|
|
|
|
FFSWAP(float *, tctx->curr_frame, tctx->prev_frame);
|
|
}
|
|
|
|
if (tctx->discarded_packets < 2) {
|
|
tctx->discarded_packets++;
|
|
*got_frame_ptr = 0;
|
|
return buf_size;
|
|
}
|
|
|
|
*got_frame_ptr = 1;
|
|
|
|
// VQF can deliver packets 1 byte greater than block align
|
|
if (buf_size == avctx->block_align + 1)
|
|
return buf_size;
|
|
return avctx->block_align;
|
|
}
|
|
|
|
/**
|
|
* Init IMDCT and windowing tables
|
|
*/
|
|
static av_cold int init_mdct_win(TwinVQContext *tctx)
|
|
{
|
|
int i, j, ret;
|
|
const TwinVQModeTab *mtab = tctx->mtab;
|
|
int size_s = mtab->size / mtab->fmode[TWINVQ_FT_SHORT].sub;
|
|
int size_m = mtab->size / mtab->fmode[TWINVQ_FT_MEDIUM].sub;
|
|
int channels = tctx->avctx->channels;
|
|
float norm = channels == 1 ? 2.0 : 1.0;
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
int bsize = tctx->mtab->size / tctx->mtab->fmode[i].sub;
|
|
if ((ret = ff_mdct_init(&tctx->mdct_ctx[i], av_log2(bsize) + 1, 1,
|
|
-sqrt(norm / bsize) / (1 << 15))))
|
|
return ret;
|
|
}
|
|
|
|
FF_ALLOC_ARRAY_OR_GOTO(tctx->avctx, tctx->tmp_buf,
|
|
mtab->size, sizeof(*tctx->tmp_buf), alloc_fail);
|
|
|
|
FF_ALLOC_ARRAY_OR_GOTO(tctx->avctx, tctx->spectrum,
|
|
2 * mtab->size, channels * sizeof(*tctx->spectrum),
|
|
alloc_fail);
|
|
FF_ALLOC_ARRAY_OR_GOTO(tctx->avctx, tctx->curr_frame,
|
|
2 * mtab->size, channels * sizeof(*tctx->curr_frame),
|
|
alloc_fail);
|
|
FF_ALLOC_ARRAY_OR_GOTO(tctx->avctx, tctx->prev_frame,
|
|
2 * mtab->size, channels * sizeof(*tctx->prev_frame),
|
|
alloc_fail);
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
int m = 4 * mtab->size / mtab->fmode[i].sub;
|
|
double freq = 2 * M_PI / m;
|
|
FF_ALLOC_ARRAY_OR_GOTO(tctx->avctx, tctx->cos_tabs[i],
|
|
(m / 4), sizeof(*tctx->cos_tabs[i]), alloc_fail);
|
|
|
|
for (j = 0; j <= m / 8; j++)
|
|
tctx->cos_tabs[i][j] = cos((2 * j + 1) * freq);
|
|
for (j = 1; j < m / 8; j++)
|
|
tctx->cos_tabs[i][m / 4 - j] = tctx->cos_tabs[i][j];
|
|
}
|
|
|
|
ff_init_ff_sine_windows(av_log2(size_m));
|
|
ff_init_ff_sine_windows(av_log2(size_s / 2));
|
|
ff_init_ff_sine_windows(av_log2(mtab->size));
|
|
|
|
return 0;
|
|
|
|
alloc_fail:
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
/**
|
|
* Interpret the data as if it were a num_blocks x line_len[0] matrix and for
|
|
* each line do a cyclic permutation, i.e.
|
|
* abcdefghijklm -> defghijklmabc
|
|
* where the amount to be shifted is evaluated depending on the column.
|
|
*/
|
|
static void permutate_in_line(int16_t *tab, int num_vect, int num_blocks,
|
|
int block_size,
|
|
const uint8_t line_len[2], int length_div,
|
|
enum TwinVQFrameType ftype)
|
|
{
|
|
int i, j;
|
|
|
|
for (i = 0; i < line_len[0]; i++) {
|
|
int shift;
|
|
|
|
if (num_blocks == 1 ||
|
|
(ftype == TWINVQ_FT_LONG && num_vect % num_blocks) ||
|
|
(ftype != TWINVQ_FT_LONG && num_vect & 1) ||
|
|
i == line_len[1]) {
|
|
shift = 0;
|
|
} else if (ftype == TWINVQ_FT_LONG) {
|
|
shift = i;
|
|
} else
|
|
shift = i * i;
|
|
|
|
for (j = 0; j < num_vect && (j + num_vect * i < block_size * num_blocks); j++)
|
|
tab[i * num_vect + j] = i * num_vect + (j + shift) % num_vect;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Interpret the input data as in the following table:
|
|
*
|
|
* @verbatim
|
|
*
|
|
* abcdefgh
|
|
* ijklmnop
|
|
* qrstuvw
|
|
* x123456
|
|
*
|
|
* @endverbatim
|
|
*
|
|
* and transpose it, giving the output
|
|
* aiqxbjr1cks2dlt3emu4fvn5gow6hp
|
|
*/
|
|
static void transpose_perm(int16_t *out, int16_t *in, int num_vect,
|
|
const uint8_t line_len[2], int length_div)
|
|
{
|
|
int i, j;
|
|
int cont = 0;
|
|
|
|
for (i = 0; i < num_vect; i++)
|
|
for (j = 0; j < line_len[i >= length_div]; j++)
|
|
out[cont++] = in[j * num_vect + i];
|
|
}
|
|
|
|
static void linear_perm(int16_t *out, int16_t *in, int n_blocks, int size)
|
|
{
|
|
int block_size = size / n_blocks;
|
|
int i;
|
|
|
|
for (i = 0; i < size; i++)
|
|
out[i] = block_size * (in[i] % n_blocks) + in[i] / n_blocks;
|
|
}
|
|
|
|
static av_cold void construct_perm_table(TwinVQContext *tctx,
|
|
enum TwinVQFrameType ftype)
|
|
{
|
|
int block_size, size;
|
|
const TwinVQModeTab *mtab = tctx->mtab;
|
|
int16_t *tmp_perm = (int16_t *)tctx->tmp_buf;
|
|
|
|
if (ftype == TWINVQ_FT_PPC) {
|
|
size = tctx->avctx->channels;
|
|
block_size = mtab->ppc_shape_len;
|
|
} else {
|
|
size = tctx->avctx->channels * mtab->fmode[ftype].sub;
|
|
block_size = mtab->size / mtab->fmode[ftype].sub;
|
|
}
|
|
|
|
permutate_in_line(tmp_perm, tctx->n_div[ftype], size,
|
|
block_size, tctx->length[ftype],
|
|
tctx->length_change[ftype], ftype);
|
|
|
|
transpose_perm(tctx->permut[ftype], tmp_perm, tctx->n_div[ftype],
|
|
tctx->length[ftype], tctx->length_change[ftype]);
|
|
|
|
linear_perm(tctx->permut[ftype], tctx->permut[ftype], size,
|
|
size * block_size);
|
|
}
|
|
|
|
static av_cold void init_bitstream_params(TwinVQContext *tctx)
|
|
{
|
|
const TwinVQModeTab *mtab = tctx->mtab;
|
|
int n_ch = tctx->avctx->channels;
|
|
int total_fr_bits = tctx->avctx->bit_rate * mtab->size /
|
|
tctx->avctx->sample_rate;
|
|
|
|
int lsp_bits_per_block = n_ch * (mtab->lsp_bit0 + mtab->lsp_bit1 +
|
|
mtab->lsp_split * mtab->lsp_bit2);
|
|
|
|
int ppc_bits = n_ch * (mtab->pgain_bit + mtab->ppc_shape_bit +
|
|
mtab->ppc_period_bit);
|
|
|
|
int bsize_no_main_cb[3], bse_bits[3], i;
|
|
enum TwinVQFrameType frametype;
|
|
|
|
for (i = 0; i < 3; i++)
|
|
// +1 for history usage switch
|
|
bse_bits[i] = n_ch *
|
|
(mtab->fmode[i].bark_n_coef *
|
|
mtab->fmode[i].bark_n_bit + 1);
|
|
|
|
bsize_no_main_cb[2] = bse_bits[2] + lsp_bits_per_block + ppc_bits +
|
|
TWINVQ_WINDOW_TYPE_BITS + n_ch * TWINVQ_GAIN_BITS;
|
|
|
|
for (i = 0; i < 2; i++)
|
|
bsize_no_main_cb[i] =
|
|
lsp_bits_per_block + n_ch * TWINVQ_GAIN_BITS +
|
|
TWINVQ_WINDOW_TYPE_BITS +
|
|
mtab->fmode[i].sub * (bse_bits[i] + n_ch * TWINVQ_SUB_GAIN_BITS);
|
|
|
|
if (tctx->codec == TWINVQ_CODEC_METASOUND && !tctx->is_6kbps) {
|
|
bsize_no_main_cb[1] += 2;
|
|
bsize_no_main_cb[2] += 2;
|
|
}
|
|
|
|
// The remaining bits are all used for the main spectrum coefficients
|
|
for (i = 0; i < 4; i++) {
|
|
int bit_size, vect_size;
|
|
int rounded_up, rounded_down, num_rounded_down, num_rounded_up;
|
|
if (i == 3) {
|
|
bit_size = n_ch * mtab->ppc_shape_bit;
|
|
vect_size = n_ch * mtab->ppc_shape_len;
|
|
} else {
|
|
bit_size = total_fr_bits - bsize_no_main_cb[i];
|
|
vect_size = n_ch * mtab->size;
|
|
}
|
|
|
|
tctx->n_div[i] = (bit_size + 13) / 14;
|
|
|
|
rounded_up = (bit_size + tctx->n_div[i] - 1) /
|
|
tctx->n_div[i];
|
|
rounded_down = (bit_size) / tctx->n_div[i];
|
|
num_rounded_down = rounded_up * tctx->n_div[i] - bit_size;
|
|
num_rounded_up = tctx->n_div[i] - num_rounded_down;
|
|
tctx->bits_main_spec[0][i][0] = (rounded_up + 1) / 2;
|
|
tctx->bits_main_spec[1][i][0] = rounded_up / 2;
|
|
tctx->bits_main_spec[0][i][1] = (rounded_down + 1) / 2;
|
|
tctx->bits_main_spec[1][i][1] = rounded_down / 2;
|
|
tctx->bits_main_spec_change[i] = num_rounded_up;
|
|
|
|
rounded_up = (vect_size + tctx->n_div[i] - 1) /
|
|
tctx->n_div[i];
|
|
rounded_down = (vect_size) / tctx->n_div[i];
|
|
num_rounded_down = rounded_up * tctx->n_div[i] - vect_size;
|
|
num_rounded_up = tctx->n_div[i] - num_rounded_down;
|
|
tctx->length[i][0] = rounded_up;
|
|
tctx->length[i][1] = rounded_down;
|
|
tctx->length_change[i] = num_rounded_up;
|
|
}
|
|
|
|
for (frametype = TWINVQ_FT_SHORT; frametype <= TWINVQ_FT_PPC; frametype++)
|
|
construct_perm_table(tctx, frametype);
|
|
}
|
|
|
|
av_cold int ff_twinvq_decode_close(AVCodecContext *avctx)
|
|
{
|
|
TwinVQContext *tctx = avctx->priv_data;
|
|
int i;
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
ff_mdct_end(&tctx->mdct_ctx[i]);
|
|
av_freep(&tctx->cos_tabs[i]);
|
|
}
|
|
|
|
av_freep(&tctx->curr_frame);
|
|
av_freep(&tctx->spectrum);
|
|
av_freep(&tctx->prev_frame);
|
|
av_freep(&tctx->tmp_buf);
|
|
av_freep(&tctx->fdsp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
av_cold int ff_twinvq_decode_init(AVCodecContext *avctx)
|
|
{
|
|
int ret;
|
|
TwinVQContext *tctx = avctx->priv_data;
|
|
int64_t frames_per_packet;
|
|
|
|
tctx->avctx = avctx;
|
|
avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
|
|
|
|
if (!avctx->block_align) {
|
|
avctx->block_align = tctx->frame_size + 7 >> 3;
|
|
}
|
|
frames_per_packet = avctx->block_align * 8LL / tctx->frame_size;
|
|
if (frames_per_packet <= 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "Block align is %"PRId64" bits, expected %d\n",
|
|
avctx->block_align * (int64_t)8, tctx->frame_size);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if (frames_per_packet > TWINVQ_MAX_FRAMES_PER_PACKET) {
|
|
av_log(avctx, AV_LOG_ERROR, "Too many frames per packet (%"PRId64")\n",
|
|
frames_per_packet);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
tctx->frames_per_packet = frames_per_packet;
|
|
|
|
tctx->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
|
|
if (!tctx->fdsp) {
|
|
ff_twinvq_decode_close(avctx);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
if ((ret = init_mdct_win(tctx))) {
|
|
av_log(avctx, AV_LOG_ERROR, "Error initializing MDCT\n");
|
|
ff_twinvq_decode_close(avctx);
|
|
return ret;
|
|
}
|
|
init_bitstream_params(tctx);
|
|
|
|
twinvq_memset_float(tctx->bark_hist[0][0], 0.1,
|
|
FF_ARRAY_ELEMS(tctx->bark_hist));
|
|
|
|
return 0;
|
|
}
|