mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-15 19:39:05 +02:00
c92cc2d559
Does nothing fancy but still sounds very decent at 128kbps. Still room to improve by bringing in the low pass and PNS management from the main big twoloop which should improve its quality but not sacrifice that much speed. Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
966 lines
40 KiB
C
966 lines
40 KiB
C
/*
|
|
* AAC coefficients encoder
|
|
* Copyright (C) 2008-2009 Konstantin Shishkov
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* AAC coefficients encoder
|
|
*/
|
|
|
|
/***********************************
|
|
* TODOs:
|
|
* speedup quantizer selection
|
|
* add sane pulse detection
|
|
***********************************/
|
|
|
|
#include "libavutil/libm.h" // brought forward to work around cygwin header breakage
|
|
|
|
#include <float.h>
|
|
|
|
#include "libavutil/mathematics.h"
|
|
#include "mathops.h"
|
|
#include "avcodec.h"
|
|
#include "put_bits.h"
|
|
#include "aac.h"
|
|
#include "aacenc.h"
|
|
#include "aactab.h"
|
|
#include "aacenctab.h"
|
|
#include "aacenc_utils.h"
|
|
#include "aacenc_quantization.h"
|
|
|
|
#include "aacenc_is.h"
|
|
#include "aacenc_tns.h"
|
|
#include "aacenc_ltp.h"
|
|
#include "aacenc_pred.h"
|
|
|
|
#include "libavcodec/aaccoder_twoloop.h"
|
|
|
|
/* Parameter of f(x) = a*(lambda/100), defines the maximum fourier spread
|
|
* beyond which no PNS is used (since the SFBs contain tone rather than noise) */
|
|
#define NOISE_SPREAD_THRESHOLD 0.9f
|
|
|
|
/* Parameter of f(x) = a*(100/lambda), defines how much PNS is allowed to
|
|
* replace low energy non zero bands */
|
|
#define NOISE_LAMBDA_REPLACE 1.948f
|
|
|
|
#include "libavcodec/aaccoder_trellis.h"
|
|
|
|
/**
|
|
* structure used in optimal codebook search
|
|
*/
|
|
typedef struct BandCodingPath {
|
|
int prev_idx; ///< pointer to the previous path point
|
|
float cost; ///< path cost
|
|
int run;
|
|
} BandCodingPath;
|
|
|
|
/**
|
|
* Encode band info for single window group bands.
|
|
*/
|
|
static void encode_window_bands_info(AACEncContext *s, SingleChannelElement *sce,
|
|
int win, int group_len, const float lambda)
|
|
{
|
|
BandCodingPath path[120][CB_TOT_ALL];
|
|
int w, swb, cb, start, size;
|
|
int i, j;
|
|
const int max_sfb = sce->ics.max_sfb;
|
|
const int run_bits = sce->ics.num_windows == 1 ? 5 : 3;
|
|
const int run_esc = (1 << run_bits) - 1;
|
|
int idx, ppos, count;
|
|
int stackrun[120], stackcb[120], stack_len;
|
|
float next_minrd = INFINITY;
|
|
int next_mincb = 0;
|
|
|
|
abs_pow34_v(s->scoefs, sce->coeffs, 1024);
|
|
start = win*128;
|
|
for (cb = 0; cb < CB_TOT_ALL; cb++) {
|
|
path[0][cb].cost = 0.0f;
|
|
path[0][cb].prev_idx = -1;
|
|
path[0][cb].run = 0;
|
|
}
|
|
for (swb = 0; swb < max_sfb; swb++) {
|
|
size = sce->ics.swb_sizes[swb];
|
|
if (sce->zeroes[win*16 + swb]) {
|
|
for (cb = 0; cb < CB_TOT_ALL; cb++) {
|
|
path[swb+1][cb].prev_idx = cb;
|
|
path[swb+1][cb].cost = path[swb][cb].cost;
|
|
path[swb+1][cb].run = path[swb][cb].run + 1;
|
|
}
|
|
} else {
|
|
float minrd = next_minrd;
|
|
int mincb = next_mincb;
|
|
next_minrd = INFINITY;
|
|
next_mincb = 0;
|
|
for (cb = 0; cb < CB_TOT_ALL; cb++) {
|
|
float cost_stay_here, cost_get_here;
|
|
float rd = 0.0f;
|
|
if (cb >= 12 && sce->band_type[win*16+swb] < aac_cb_out_map[cb] ||
|
|
cb < aac_cb_in_map[sce->band_type[win*16+swb]] && sce->band_type[win*16+swb] > aac_cb_out_map[cb]) {
|
|
path[swb+1][cb].prev_idx = -1;
|
|
path[swb+1][cb].cost = INFINITY;
|
|
path[swb+1][cb].run = path[swb][cb].run + 1;
|
|
continue;
|
|
}
|
|
for (w = 0; w < group_len; w++) {
|
|
FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(win+w)*16+swb];
|
|
rd += quantize_band_cost(s, &sce->coeffs[start + w*128],
|
|
&s->scoefs[start + w*128], size,
|
|
sce->sf_idx[(win+w)*16+swb], aac_cb_out_map[cb],
|
|
lambda / band->threshold, INFINITY, NULL, NULL, 0);
|
|
}
|
|
cost_stay_here = path[swb][cb].cost + rd;
|
|
cost_get_here = minrd + rd + run_bits + 4;
|
|
if ( run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run]
|
|
!= run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run+1])
|
|
cost_stay_here += run_bits;
|
|
if (cost_get_here < cost_stay_here) {
|
|
path[swb+1][cb].prev_idx = mincb;
|
|
path[swb+1][cb].cost = cost_get_here;
|
|
path[swb+1][cb].run = 1;
|
|
} else {
|
|
path[swb+1][cb].prev_idx = cb;
|
|
path[swb+1][cb].cost = cost_stay_here;
|
|
path[swb+1][cb].run = path[swb][cb].run + 1;
|
|
}
|
|
if (path[swb+1][cb].cost < next_minrd) {
|
|
next_minrd = path[swb+1][cb].cost;
|
|
next_mincb = cb;
|
|
}
|
|
}
|
|
}
|
|
start += sce->ics.swb_sizes[swb];
|
|
}
|
|
|
|
//convert resulting path from backward-linked list
|
|
stack_len = 0;
|
|
idx = 0;
|
|
for (cb = 1; cb < CB_TOT_ALL; cb++)
|
|
if (path[max_sfb][cb].cost < path[max_sfb][idx].cost)
|
|
idx = cb;
|
|
ppos = max_sfb;
|
|
while (ppos > 0) {
|
|
av_assert1(idx >= 0);
|
|
cb = idx;
|
|
stackrun[stack_len] = path[ppos][cb].run;
|
|
stackcb [stack_len] = cb;
|
|
idx = path[ppos-path[ppos][cb].run+1][cb].prev_idx;
|
|
ppos -= path[ppos][cb].run;
|
|
stack_len++;
|
|
}
|
|
//perform actual band info encoding
|
|
start = 0;
|
|
for (i = stack_len - 1; i >= 0; i--) {
|
|
cb = aac_cb_out_map[stackcb[i]];
|
|
put_bits(&s->pb, 4, cb);
|
|
count = stackrun[i];
|
|
memset(sce->zeroes + win*16 + start, !cb, count);
|
|
//XXX: memset when band_type is also uint8_t
|
|
for (j = 0; j < count; j++) {
|
|
sce->band_type[win*16 + start] = cb;
|
|
start++;
|
|
}
|
|
while (count >= run_esc) {
|
|
put_bits(&s->pb, run_bits, run_esc);
|
|
count -= run_esc;
|
|
}
|
|
put_bits(&s->pb, run_bits, count);
|
|
}
|
|
}
|
|
|
|
|
|
typedef struct TrellisPath {
|
|
float cost;
|
|
int prev;
|
|
} TrellisPath;
|
|
|
|
#define TRELLIS_STAGES 121
|
|
#define TRELLIS_STATES (SCALE_MAX_DIFF+1)
|
|
|
|
static void set_special_band_scalefactors(AACEncContext *s, SingleChannelElement *sce)
|
|
{
|
|
int w, g;
|
|
int prevscaler_n = -255, prevscaler_i = 0;
|
|
int bands = 0;
|
|
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
if (sce->zeroes[w*16+g])
|
|
continue;
|
|
if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) {
|
|
sce->sf_idx[w*16+g] = av_clip(roundf(log2f(sce->is_ener[w*16+g])*2), -155, 100);
|
|
bands++;
|
|
} else if (sce->band_type[w*16+g] == NOISE_BT) {
|
|
sce->sf_idx[w*16+g] = av_clip(3+ceilf(log2f(sce->pns_ener[w*16+g])*2), -100, 155);
|
|
if (prevscaler_n == -255)
|
|
prevscaler_n = sce->sf_idx[w*16+g];
|
|
bands++;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!bands)
|
|
return;
|
|
|
|
/* Clip the scalefactor indices */
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
if (sce->zeroes[w*16+g])
|
|
continue;
|
|
if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) {
|
|
sce->sf_idx[w*16+g] = prevscaler_i = av_clip(sce->sf_idx[w*16+g], prevscaler_i - SCALE_MAX_DIFF, prevscaler_i + SCALE_MAX_DIFF);
|
|
} else if (sce->band_type[w*16+g] == NOISE_BT) {
|
|
sce->sf_idx[w*16+g] = prevscaler_n = av_clip(sce->sf_idx[w*16+g], prevscaler_n - SCALE_MAX_DIFF, prevscaler_n + SCALE_MAX_DIFF);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s,
|
|
SingleChannelElement *sce,
|
|
const float lambda)
|
|
{
|
|
int q, w, w2, g, start = 0;
|
|
int i, j;
|
|
int idx;
|
|
TrellisPath paths[TRELLIS_STAGES][TRELLIS_STATES];
|
|
int bandaddr[TRELLIS_STAGES];
|
|
int minq;
|
|
float mincost;
|
|
float q0f = FLT_MAX, q1f = 0.0f, qnrgf = 0.0f;
|
|
int q0, q1, qcnt = 0;
|
|
|
|
for (i = 0; i < 1024; i++) {
|
|
float t = fabsf(sce->coeffs[i]);
|
|
if (t > 0.0f) {
|
|
q0f = FFMIN(q0f, t);
|
|
q1f = FFMAX(q1f, t);
|
|
qnrgf += t*t;
|
|
qcnt++;
|
|
}
|
|
}
|
|
|
|
if (!qcnt) {
|
|
memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
|
|
memset(sce->zeroes, 1, sizeof(sce->zeroes));
|
|
return;
|
|
}
|
|
|
|
//minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
|
|
q0 = av_clip(coef2minsf(q0f), 0, SCALE_MAX_POS-1);
|
|
//maximum scalefactor index is when maximum coefficient after quantizing is still not zero
|
|
q1 = av_clip(coef2maxsf(q1f), 1, SCALE_MAX_POS);
|
|
if (q1 - q0 > 60) {
|
|
int q0low = q0;
|
|
int q1high = q1;
|
|
//minimum scalefactor index is when maximum nonzero coefficient after quantizing is not clipped
|
|
int qnrg = av_clip_uint8(log2f(sqrtf(qnrgf/qcnt))*4 - 31 + SCALE_ONE_POS - SCALE_DIV_512);
|
|
q1 = qnrg + 30;
|
|
q0 = qnrg - 30;
|
|
if (q0 < q0low) {
|
|
q1 += q0low - q0;
|
|
q0 = q0low;
|
|
} else if (q1 > q1high) {
|
|
q0 -= q1 - q1high;
|
|
q1 = q1high;
|
|
}
|
|
}
|
|
// q0 == q1 isn't really a legal situation
|
|
if (q0 == q1) {
|
|
// the following is indirect but guarantees q1 != q0 && q1 near q0
|
|
q1 = av_clip(q0+1, 1, SCALE_MAX_POS);
|
|
q0 = av_clip(q1-1, 0, SCALE_MAX_POS - 1);
|
|
}
|
|
|
|
for (i = 0; i < TRELLIS_STATES; i++) {
|
|
paths[0][i].cost = 0.0f;
|
|
paths[0][i].prev = -1;
|
|
}
|
|
for (j = 1; j < TRELLIS_STAGES; j++) {
|
|
for (i = 0; i < TRELLIS_STATES; i++) {
|
|
paths[j][i].cost = INFINITY;
|
|
paths[j][i].prev = -2;
|
|
}
|
|
}
|
|
idx = 1;
|
|
abs_pow34_v(s->scoefs, sce->coeffs, 1024);
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
start = w*128;
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
const float *coefs = &sce->coeffs[start];
|
|
float qmin, qmax;
|
|
int nz = 0;
|
|
|
|
bandaddr[idx] = w * 16 + g;
|
|
qmin = INT_MAX;
|
|
qmax = 0.0f;
|
|
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
|
|
FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
|
|
if (band->energy <= band->threshold || band->threshold == 0.0f) {
|
|
sce->zeroes[(w+w2)*16+g] = 1;
|
|
continue;
|
|
}
|
|
sce->zeroes[(w+w2)*16+g] = 0;
|
|
nz = 1;
|
|
for (i = 0; i < sce->ics.swb_sizes[g]; i++) {
|
|
float t = fabsf(coefs[w2*128+i]);
|
|
if (t > 0.0f)
|
|
qmin = FFMIN(qmin, t);
|
|
qmax = FFMAX(qmax, t);
|
|
}
|
|
}
|
|
if (nz) {
|
|
int minscale, maxscale;
|
|
float minrd = INFINITY;
|
|
float maxval;
|
|
//minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
|
|
minscale = coef2minsf(qmin);
|
|
//maximum scalefactor index is when maximum coefficient after quantizing is still not zero
|
|
maxscale = coef2maxsf(qmax);
|
|
minscale = av_clip(minscale - q0, 0, TRELLIS_STATES - 1);
|
|
maxscale = av_clip(maxscale - q0, 0, TRELLIS_STATES);
|
|
if (minscale == maxscale) {
|
|
maxscale = av_clip(minscale+1, 1, TRELLIS_STATES);
|
|
minscale = av_clip(maxscale-1, 0, TRELLIS_STATES - 1);
|
|
}
|
|
maxval = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], s->scoefs+start);
|
|
for (q = minscale; q < maxscale; q++) {
|
|
float dist = 0;
|
|
int cb = find_min_book(maxval, sce->sf_idx[w*16+g]);
|
|
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
|
|
FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
|
|
dist += quantize_band_cost(s, coefs + w2*128, s->scoefs + start + w2*128, sce->ics.swb_sizes[g],
|
|
q + q0, cb, lambda / band->threshold, INFINITY, NULL, NULL, 0);
|
|
}
|
|
minrd = FFMIN(minrd, dist);
|
|
|
|
for (i = 0; i < q1 - q0; i++) {
|
|
float cost;
|
|
cost = paths[idx - 1][i].cost + dist
|
|
+ ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO];
|
|
if (cost < paths[idx][q].cost) {
|
|
paths[idx][q].cost = cost;
|
|
paths[idx][q].prev = i;
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
for (q = 0; q < q1 - q0; q++) {
|
|
paths[idx][q].cost = paths[idx - 1][q].cost + 1;
|
|
paths[idx][q].prev = q;
|
|
}
|
|
}
|
|
sce->zeroes[w*16+g] = !nz;
|
|
start += sce->ics.swb_sizes[g];
|
|
idx++;
|
|
}
|
|
}
|
|
idx--;
|
|
mincost = paths[idx][0].cost;
|
|
minq = 0;
|
|
for (i = 1; i < TRELLIS_STATES; i++) {
|
|
if (paths[idx][i].cost < mincost) {
|
|
mincost = paths[idx][i].cost;
|
|
minq = i;
|
|
}
|
|
}
|
|
while (idx) {
|
|
sce->sf_idx[bandaddr[idx]] = minq + q0;
|
|
minq = FFMAX(paths[idx][minq].prev, 0);
|
|
idx--;
|
|
}
|
|
//set the same quantizers inside window groups
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
|
|
for (g = 0; g < sce->ics.num_swb; g++)
|
|
for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
|
|
sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
|
|
}
|
|
|
|
static void search_for_quantizers_fast(AVCodecContext *avctx, AACEncContext *s,
|
|
SingleChannelElement *sce,
|
|
const float lambda)
|
|
{
|
|
int start = 0, i, w, w2, g;
|
|
int destbits = avctx->bit_rate * 1024.0 / avctx->sample_rate / avctx->channels * (lambda / 120.f);
|
|
float dists[128] = { 0 }, uplims[128] = { 0 };
|
|
float maxvals[128];
|
|
int fflag, minscaler;
|
|
int its = 0;
|
|
int allz = 0;
|
|
float minthr = INFINITY;
|
|
|
|
// for values above this the decoder might end up in an endless loop
|
|
// due to always having more bits than what can be encoded.
|
|
destbits = FFMIN(destbits, 5800);
|
|
//XXX: some heuristic to determine initial quantizers will reduce search time
|
|
//determine zero bands and upper limits
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
start = 0;
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
int nz = 0;
|
|
float uplim = 0.0f, energy = 0.0f;
|
|
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
|
|
FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
|
|
uplim += band->threshold;
|
|
energy += band->energy;
|
|
if (band->energy <= band->threshold || band->threshold == 0.0f) {
|
|
sce->zeroes[(w+w2)*16+g] = 1;
|
|
continue;
|
|
}
|
|
nz = 1;
|
|
}
|
|
uplims[w*16+g] = uplim *512;
|
|
sce->band_type[w*16+g] = 0;
|
|
sce->zeroes[w*16+g] = !nz;
|
|
if (nz)
|
|
minthr = FFMIN(minthr, uplim);
|
|
allz |= nz;
|
|
start += sce->ics.swb_sizes[g];
|
|
}
|
|
}
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
if (sce->zeroes[w*16+g]) {
|
|
sce->sf_idx[w*16+g] = SCALE_ONE_POS;
|
|
continue;
|
|
}
|
|
sce->sf_idx[w*16+g] = SCALE_ONE_POS + FFMIN(log2f(uplims[w*16+g]/minthr)*4,59);
|
|
}
|
|
}
|
|
|
|
if (!allz)
|
|
return;
|
|
abs_pow34_v(s->scoefs, sce->coeffs, 1024);
|
|
ff_quantize_band_cost_cache_init(s);
|
|
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
start = w*128;
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
const float *scaled = s->scoefs + start;
|
|
maxvals[w*16+g] = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], scaled);
|
|
start += sce->ics.swb_sizes[g];
|
|
}
|
|
}
|
|
|
|
//perform two-loop search
|
|
//outer loop - improve quality
|
|
do {
|
|
int tbits, qstep;
|
|
minscaler = sce->sf_idx[0];
|
|
//inner loop - quantize spectrum to fit into given number of bits
|
|
qstep = its ? 1 : 32;
|
|
do {
|
|
int prev = -1;
|
|
tbits = 0;
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
start = w*128;
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
const float *coefs = sce->coeffs + start;
|
|
const float *scaled = s->scoefs + start;
|
|
int bits = 0;
|
|
int cb;
|
|
float dist = 0.0f;
|
|
|
|
if (sce->zeroes[w*16+g] || sce->sf_idx[w*16+g] >= 218) {
|
|
start += sce->ics.swb_sizes[g];
|
|
continue;
|
|
}
|
|
minscaler = FFMIN(minscaler, sce->sf_idx[w*16+g]);
|
|
cb = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);
|
|
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
|
|
int b;
|
|
dist += quantize_band_cost_cached(s, w + w2, g,
|
|
coefs + w2*128,
|
|
scaled + w2*128,
|
|
sce->ics.swb_sizes[g],
|
|
sce->sf_idx[w*16+g],
|
|
cb, 1.0f, INFINITY,
|
|
&b, NULL, 0);
|
|
bits += b;
|
|
}
|
|
dists[w*16+g] = dist - bits;
|
|
if (prev != -1) {
|
|
bits += ff_aac_scalefactor_bits[sce->sf_idx[w*16+g] - prev + SCALE_DIFF_ZERO];
|
|
}
|
|
tbits += bits;
|
|
start += sce->ics.swb_sizes[g];
|
|
prev = sce->sf_idx[w*16+g];
|
|
}
|
|
}
|
|
if (tbits > destbits) {
|
|
for (i = 0; i < 128; i++)
|
|
if (sce->sf_idx[i] < 218 - qstep)
|
|
sce->sf_idx[i] += qstep;
|
|
} else {
|
|
for (i = 0; i < 128; i++)
|
|
if (sce->sf_idx[i] > 60 - qstep)
|
|
sce->sf_idx[i] -= qstep;
|
|
}
|
|
qstep >>= 1;
|
|
if (!qstep && tbits > destbits*1.02 && sce->sf_idx[0] < 217)
|
|
qstep = 1;
|
|
} while (qstep);
|
|
|
|
fflag = 0;
|
|
minscaler = av_clip(minscaler, 60, 255 - SCALE_MAX_DIFF);
|
|
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
int prevsc = sce->sf_idx[w*16+g];
|
|
if (dists[w*16+g] > uplims[w*16+g] && sce->sf_idx[w*16+g] > 60) {
|
|
if (find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]-1))
|
|
sce->sf_idx[w*16+g]--;
|
|
else //Try to make sure there is some energy in every band
|
|
sce->sf_idx[w*16+g]-=2;
|
|
}
|
|
sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler, minscaler + SCALE_MAX_DIFF);
|
|
sce->sf_idx[w*16+g] = FFMIN(sce->sf_idx[w*16+g], 219);
|
|
if (sce->sf_idx[w*16+g] != prevsc)
|
|
fflag = 1;
|
|
sce->band_type[w*16+g] = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);
|
|
}
|
|
}
|
|
its++;
|
|
} while (fflag && its < 10);
|
|
}
|
|
|
|
static void search_for_pns(AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)
|
|
{
|
|
FFPsyBand *band;
|
|
int w, g, w2, i;
|
|
int wlen = 1024 / sce->ics.num_windows;
|
|
int bandwidth, cutoff;
|
|
float *PNS = &s->scoefs[0*128], *PNS34 = &s->scoefs[1*128];
|
|
float *NOR34 = &s->scoefs[3*128];
|
|
uint8_t nextband[128];
|
|
const float lambda = s->lambda;
|
|
const float freq_mult = avctx->sample_rate*0.5f/wlen;
|
|
const float thr_mult = NOISE_LAMBDA_REPLACE*(100.0f/lambda);
|
|
const float spread_threshold = FFMIN(0.75f, NOISE_SPREAD_THRESHOLD*FFMAX(0.5f, lambda/100.f));
|
|
const float dist_bias = av_clipf(4.f * 120 / lambda, 0.25f, 4.0f);
|
|
const float pns_transient_energy_r = FFMIN(0.7f, lambda / 140.f);
|
|
|
|
int refbits = avctx->bit_rate * 1024.0 / avctx->sample_rate
|
|
/ ((avctx->flags & CODEC_FLAG_QSCALE) ? 2.0f : avctx->channels)
|
|
* (lambda / 120.f);
|
|
|
|
/** Keep this in sync with twoloop's cutoff selection */
|
|
float rate_bandwidth_multiplier = 1.5f;
|
|
int prev = -1000, prev_sf = -1;
|
|
int frame_bit_rate = (avctx->flags & CODEC_FLAG_QSCALE)
|
|
? (refbits * rate_bandwidth_multiplier * avctx->sample_rate / 1024)
|
|
: (avctx->bit_rate / avctx->channels);
|
|
|
|
frame_bit_rate *= 1.15f;
|
|
|
|
if (avctx->cutoff > 0) {
|
|
bandwidth = avctx->cutoff;
|
|
} else {
|
|
bandwidth = FFMAX(3000, AAC_CUTOFF_FROM_BITRATE(frame_bit_rate, 1, avctx->sample_rate));
|
|
}
|
|
|
|
cutoff = bandwidth * 2 * wlen / avctx->sample_rate;
|
|
|
|
memcpy(sce->band_alt, sce->band_type, sizeof(sce->band_type));
|
|
ff_init_nextband_map(sce, nextband);
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
int wstart = w*128;
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
int noise_sfi;
|
|
float dist1 = 0.0f, dist2 = 0.0f, noise_amp;
|
|
float pns_energy = 0.0f, pns_tgt_energy, energy_ratio, dist_thresh;
|
|
float sfb_energy = 0.0f, threshold = 0.0f, spread = 2.0f;
|
|
float min_energy = -1.0f, max_energy = 0.0f;
|
|
const int start = wstart+sce->ics.swb_offset[g];
|
|
const float freq = (start-wstart)*freq_mult;
|
|
const float freq_boost = FFMAX(0.88f*freq/NOISE_LOW_LIMIT, 1.0f);
|
|
if (freq < NOISE_LOW_LIMIT || (start-wstart) >= cutoff) {
|
|
if (!sce->zeroes[w*16+g])
|
|
prev_sf = sce->sf_idx[w*16+g];
|
|
continue;
|
|
}
|
|
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
|
|
band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
|
|
sfb_energy += band->energy;
|
|
spread = FFMIN(spread, band->spread);
|
|
threshold += band->threshold;
|
|
if (!w2) {
|
|
min_energy = max_energy = band->energy;
|
|
} else {
|
|
min_energy = FFMIN(min_energy, band->energy);
|
|
max_energy = FFMAX(max_energy, band->energy);
|
|
}
|
|
}
|
|
|
|
/* Ramps down at ~8000Hz and loosens the dist threshold */
|
|
dist_thresh = av_clipf(2.5f*NOISE_LOW_LIMIT/freq, 0.5f, 2.5f) * dist_bias;
|
|
|
|
/* PNS is acceptable when all of these are true:
|
|
* 1. high spread energy (noise-like band)
|
|
* 2. near-threshold energy (high PE means the random nature of PNS content will be noticed)
|
|
* 3. on short window groups, all windows have similar energy (variations in energy would be destroyed by PNS)
|
|
*
|
|
* At this stage, point 2 is relaxed for zeroed bands near the noise threshold (hole avoidance is more important)
|
|
*/
|
|
if ((!sce->zeroes[w*16+g] && !ff_sfdelta_can_remove_band(sce, nextband, prev_sf, w*16+g)) ||
|
|
((sce->zeroes[w*16+g] || !sce->band_alt[w*16+g]) && sfb_energy < threshold*sqrtf(1.0f/freq_boost)) || spread < spread_threshold ||
|
|
(!sce->zeroes[w*16+g] && sce->band_alt[w*16+g] && sfb_energy > threshold*thr_mult*freq_boost) ||
|
|
min_energy < pns_transient_energy_r * max_energy ) {
|
|
sce->pns_ener[w*16+g] = sfb_energy;
|
|
if (!sce->zeroes[w*16+g])
|
|
prev_sf = sce->sf_idx[w*16+g];
|
|
continue;
|
|
}
|
|
|
|
pns_tgt_energy = sfb_energy*FFMIN(1.0f, spread*spread);
|
|
noise_sfi = av_clip(roundf(log2f(pns_tgt_energy)*2), -100, 155); /* Quantize */
|
|
noise_amp = -ff_aac_pow2sf_tab[noise_sfi + POW_SF2_ZERO]; /* Dequantize */
|
|
if (prev != -1000) {
|
|
int noise_sfdiff = noise_sfi - prev + SCALE_DIFF_ZERO;
|
|
if (noise_sfdiff < 0 || noise_sfdiff > 2*SCALE_MAX_DIFF) {
|
|
if (!sce->zeroes[w*16+g])
|
|
prev_sf = sce->sf_idx[w*16+g];
|
|
continue;
|
|
}
|
|
}
|
|
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
|
|
float band_energy, scale, pns_senergy;
|
|
const int start_c = (w+w2)*128+sce->ics.swb_offset[g];
|
|
band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
|
|
for (i = 0; i < sce->ics.swb_sizes[g]; i+=2) {
|
|
double rnd[2];
|
|
av_bmg_get(&s->lfg, rnd);
|
|
PNS[i+0] = (float)rnd[0];
|
|
PNS[i+1] = (float)rnd[1];
|
|
}
|
|
band_energy = s->fdsp->scalarproduct_float(PNS, PNS, sce->ics.swb_sizes[g]);
|
|
scale = noise_amp/sqrtf(band_energy);
|
|
s->fdsp->vector_fmul_scalar(PNS, PNS, scale, sce->ics.swb_sizes[g]);
|
|
pns_senergy = s->fdsp->scalarproduct_float(PNS, PNS, sce->ics.swb_sizes[g]);
|
|
pns_energy += pns_senergy;
|
|
abs_pow34_v(NOR34, &sce->coeffs[start_c], sce->ics.swb_sizes[g]);
|
|
abs_pow34_v(PNS34, PNS, sce->ics.swb_sizes[g]);
|
|
dist1 += quantize_band_cost(s, &sce->coeffs[start_c],
|
|
NOR34,
|
|
sce->ics.swb_sizes[g],
|
|
sce->sf_idx[(w+w2)*16+g],
|
|
sce->band_alt[(w+w2)*16+g],
|
|
lambda/band->threshold, INFINITY, NULL, NULL, 0);
|
|
/* Estimate rd on average as 5 bits for SF, 4 for the CB, plus spread energy * lambda/thr */
|
|
dist2 += band->energy/(band->spread*band->spread)*lambda*dist_thresh/band->threshold;
|
|
}
|
|
if (g && sce->band_type[w*16+g-1] == NOISE_BT) {
|
|
dist2 += 5;
|
|
} else {
|
|
dist2 += 9;
|
|
}
|
|
energy_ratio = pns_tgt_energy/pns_energy; /* Compensates for quantization error */
|
|
sce->pns_ener[w*16+g] = energy_ratio*pns_tgt_energy;
|
|
if (sce->zeroes[w*16+g] || !sce->band_alt[w*16+g] || (energy_ratio > 0.85f && energy_ratio < 1.25f && dist2 < dist1)) {
|
|
sce->band_type[w*16+g] = NOISE_BT;
|
|
sce->zeroes[w*16+g] = 0;
|
|
prev = noise_sfi;
|
|
} else {
|
|
if (!sce->zeroes[w*16+g])
|
|
prev_sf = sce->sf_idx[w*16+g];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void mark_pns(AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)
|
|
{
|
|
FFPsyBand *band;
|
|
int w, g, w2;
|
|
int wlen = 1024 / sce->ics.num_windows;
|
|
int bandwidth, cutoff;
|
|
const float lambda = s->lambda;
|
|
const float freq_mult = avctx->sample_rate*0.5f/wlen;
|
|
const float spread_threshold = FFMIN(0.75f, NOISE_SPREAD_THRESHOLD*FFMAX(0.5f, lambda/100.f));
|
|
const float pns_transient_energy_r = FFMIN(0.7f, lambda / 140.f);
|
|
|
|
int refbits = avctx->bit_rate * 1024.0 / avctx->sample_rate
|
|
/ ((avctx->flags & CODEC_FLAG_QSCALE) ? 2.0f : avctx->channels)
|
|
* (lambda / 120.f);
|
|
|
|
/** Keep this in sync with twoloop's cutoff selection */
|
|
float rate_bandwidth_multiplier = 1.5f;
|
|
int frame_bit_rate = (avctx->flags & CODEC_FLAG_QSCALE)
|
|
? (refbits * rate_bandwidth_multiplier * avctx->sample_rate / 1024)
|
|
: (avctx->bit_rate / avctx->channels);
|
|
|
|
frame_bit_rate *= 1.15f;
|
|
|
|
if (avctx->cutoff > 0) {
|
|
bandwidth = avctx->cutoff;
|
|
} else {
|
|
bandwidth = FFMAX(3000, AAC_CUTOFF_FROM_BITRATE(frame_bit_rate, 1, avctx->sample_rate));
|
|
}
|
|
|
|
cutoff = bandwidth * 2 * wlen / avctx->sample_rate;
|
|
|
|
memcpy(sce->band_alt, sce->band_type, sizeof(sce->band_type));
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
float sfb_energy = 0.0f, threshold = 0.0f, spread = 2.0f;
|
|
float min_energy = -1.0f, max_energy = 0.0f;
|
|
const int start = sce->ics.swb_offset[g];
|
|
const float freq = start*freq_mult;
|
|
const float freq_boost = FFMAX(0.88f*freq/NOISE_LOW_LIMIT, 1.0f);
|
|
if (freq < NOISE_LOW_LIMIT || start >= cutoff) {
|
|
sce->can_pns[w*16+g] = 0;
|
|
continue;
|
|
}
|
|
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
|
|
band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
|
|
sfb_energy += band->energy;
|
|
spread = FFMIN(spread, band->spread);
|
|
threshold += band->threshold;
|
|
if (!w2) {
|
|
min_energy = max_energy = band->energy;
|
|
} else {
|
|
min_energy = FFMIN(min_energy, band->energy);
|
|
max_energy = FFMAX(max_energy, band->energy);
|
|
}
|
|
}
|
|
|
|
/* PNS is acceptable when all of these are true:
|
|
* 1. high spread energy (noise-like band)
|
|
* 2. near-threshold energy (high PE means the random nature of PNS content will be noticed)
|
|
* 3. on short window groups, all windows have similar energy (variations in energy would be destroyed by PNS)
|
|
*/
|
|
sce->pns_ener[w*16+g] = sfb_energy;
|
|
if (sfb_energy < threshold*sqrtf(1.5f/freq_boost) || spread < spread_threshold || min_energy < pns_transient_energy_r * max_energy) {
|
|
sce->can_pns[w*16+g] = 0;
|
|
} else {
|
|
sce->can_pns[w*16+g] = 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void search_for_ms(AACEncContext *s, ChannelElement *cpe)
|
|
{
|
|
int start = 0, i, w, w2, g, sid_sf_boost, prev_mid, prev_side;
|
|
uint8_t nextband0[128], nextband1[128];
|
|
float M[128], S[128];
|
|
float *L34 = s->scoefs, *R34 = s->scoefs + 128, *M34 = s->scoefs + 128*2, *S34 = s->scoefs + 128*3;
|
|
const float lambda = s->lambda;
|
|
const float mslambda = FFMIN(1.0f, lambda / 120.f);
|
|
SingleChannelElement *sce0 = &cpe->ch[0];
|
|
SingleChannelElement *sce1 = &cpe->ch[1];
|
|
if (!cpe->common_window)
|
|
return;
|
|
|
|
/** Scout out next nonzero bands */
|
|
ff_init_nextband_map(sce0, nextband0);
|
|
ff_init_nextband_map(sce1, nextband1);
|
|
|
|
prev_mid = sce0->sf_idx[0];
|
|
prev_side = sce1->sf_idx[0];
|
|
for (w = 0; w < sce0->ics.num_windows; w += sce0->ics.group_len[w]) {
|
|
start = 0;
|
|
for (g = 0; g < sce0->ics.num_swb; g++) {
|
|
float bmax = bval2bmax(g * 17.0f / sce0->ics.num_swb) / 0.0045f;
|
|
if (!cpe->is_mask[w*16+g])
|
|
cpe->ms_mask[w*16+g] = 0;
|
|
if (!sce0->zeroes[w*16+g] && !sce1->zeroes[w*16+g] && !cpe->is_mask[w*16+g]) {
|
|
float Mmax = 0.0f, Smax = 0.0f;
|
|
|
|
/* Must compute mid/side SF and book for the whole window group */
|
|
for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
|
|
for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
|
|
M[i] = (sce0->coeffs[start+(w+w2)*128+i]
|
|
+ sce1->coeffs[start+(w+w2)*128+i]) * 0.5;
|
|
S[i] = M[i]
|
|
- sce1->coeffs[start+(w+w2)*128+i];
|
|
}
|
|
abs_pow34_v(M34, M, sce0->ics.swb_sizes[g]);
|
|
abs_pow34_v(S34, S, sce0->ics.swb_sizes[g]);
|
|
for (i = 0; i < sce0->ics.swb_sizes[g]; i++ ) {
|
|
Mmax = FFMAX(Mmax, M34[i]);
|
|
Smax = FFMAX(Smax, S34[i]);
|
|
}
|
|
}
|
|
|
|
for (sid_sf_boost = 0; sid_sf_boost < 4; sid_sf_boost++) {
|
|
float dist1 = 0.0f, dist2 = 0.0f;
|
|
int B0 = 0, B1 = 0;
|
|
int minidx;
|
|
int mididx, sididx;
|
|
int midcb, sidcb;
|
|
|
|
minidx = FFMIN(sce0->sf_idx[w*16+g], sce1->sf_idx[w*16+g]);
|
|
mididx = av_clip(minidx, 0, SCALE_MAX_POS - SCALE_DIV_512);
|
|
sididx = av_clip(minidx - sid_sf_boost * 3, 0, SCALE_MAX_POS - SCALE_DIV_512);
|
|
if (sce0->band_type[w*16+g] != NOISE_BT && sce1->band_type[w*16+g] != NOISE_BT
|
|
&& ( !ff_sfdelta_can_replace(sce0, nextband0, prev_mid, mididx, w*16+g)
|
|
|| !ff_sfdelta_can_replace(sce1, nextband1, prev_side, sididx, w*16+g))) {
|
|
/* scalefactor range violation, bad stuff, will decrease quality unacceptably */
|
|
continue;
|
|
}
|
|
|
|
midcb = find_min_book(Mmax, mididx);
|
|
sidcb = find_min_book(Smax, sididx);
|
|
|
|
/* No CB can be zero */
|
|
midcb = FFMAX(1,midcb);
|
|
sidcb = FFMAX(1,sidcb);
|
|
|
|
for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
|
|
FFPsyBand *band0 = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g];
|
|
FFPsyBand *band1 = &s->psy.ch[s->cur_channel+1].psy_bands[(w+w2)*16+g];
|
|
float minthr = FFMIN(band0->threshold, band1->threshold);
|
|
int b1,b2,b3,b4;
|
|
for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
|
|
M[i] = (sce0->coeffs[start+(w+w2)*128+i]
|
|
+ sce1->coeffs[start+(w+w2)*128+i]) * 0.5;
|
|
S[i] = M[i]
|
|
- sce1->coeffs[start+(w+w2)*128+i];
|
|
}
|
|
|
|
abs_pow34_v(L34, sce0->coeffs+start+(w+w2)*128, sce0->ics.swb_sizes[g]);
|
|
abs_pow34_v(R34, sce1->coeffs+start+(w+w2)*128, sce0->ics.swb_sizes[g]);
|
|
abs_pow34_v(M34, M, sce0->ics.swb_sizes[g]);
|
|
abs_pow34_v(S34, S, sce0->ics.swb_sizes[g]);
|
|
dist1 += quantize_band_cost(s, &sce0->coeffs[start + (w+w2)*128],
|
|
L34,
|
|
sce0->ics.swb_sizes[g],
|
|
sce0->sf_idx[w*16+g],
|
|
sce0->band_type[w*16+g],
|
|
lambda / band0->threshold, INFINITY, &b1, NULL, 0);
|
|
dist1 += quantize_band_cost(s, &sce1->coeffs[start + (w+w2)*128],
|
|
R34,
|
|
sce1->ics.swb_sizes[g],
|
|
sce1->sf_idx[w*16+g],
|
|
sce1->band_type[w*16+g],
|
|
lambda / band1->threshold, INFINITY, &b2, NULL, 0);
|
|
dist2 += quantize_band_cost(s, M,
|
|
M34,
|
|
sce0->ics.swb_sizes[g],
|
|
mididx,
|
|
midcb,
|
|
lambda / minthr, INFINITY, &b3, NULL, 0);
|
|
dist2 += quantize_band_cost(s, S,
|
|
S34,
|
|
sce1->ics.swb_sizes[g],
|
|
sididx,
|
|
sidcb,
|
|
mslambda / (minthr * bmax), INFINITY, &b4, NULL, 0);
|
|
B0 += b1+b2;
|
|
B1 += b3+b4;
|
|
dist1 -= b1+b2;
|
|
dist2 -= b3+b4;
|
|
}
|
|
cpe->ms_mask[w*16+g] = dist2 <= dist1 && B1 < B0;
|
|
if (cpe->ms_mask[w*16+g]) {
|
|
if (sce0->band_type[w*16+g] != NOISE_BT && sce1->band_type[w*16+g] != NOISE_BT) {
|
|
sce0->sf_idx[w*16+g] = mididx;
|
|
sce1->sf_idx[w*16+g] = sididx;
|
|
sce0->band_type[w*16+g] = midcb;
|
|
sce1->band_type[w*16+g] = sidcb;
|
|
} else if ((sce0->band_type[w*16+g] != NOISE_BT) ^ (sce1->band_type[w*16+g] != NOISE_BT)) {
|
|
/* ms_mask unneeded, and it confuses some decoders */
|
|
cpe->ms_mask[w*16+g] = 0;
|
|
}
|
|
break;
|
|
} else if (B1 > B0) {
|
|
/* More boost won't fix this */
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (!sce0->zeroes[w*16+g] && sce0->band_type[w*16+g] < RESERVED_BT)
|
|
prev_mid = sce0->sf_idx[w*16+g];
|
|
if (!sce1->zeroes[w*16+g] && !cpe->is_mask[w*16+g] && sce1->band_type[w*16+g] < RESERVED_BT)
|
|
prev_side = sce1->sf_idx[w*16+g];
|
|
start += sce0->ics.swb_sizes[g];
|
|
}
|
|
}
|
|
}
|
|
|
|
AACCoefficientsEncoder ff_aac_coders[AAC_CODER_NB] = {
|
|
[AAC_CODER_ANMR] = {
|
|
search_for_quantizers_anmr,
|
|
encode_window_bands_info,
|
|
quantize_and_encode_band,
|
|
ff_aac_encode_tns_info,
|
|
ff_aac_encode_ltp_info,
|
|
ff_aac_encode_main_pred,
|
|
ff_aac_adjust_common_pred,
|
|
ff_aac_adjust_common_ltp,
|
|
ff_aac_apply_main_pred,
|
|
ff_aac_apply_tns,
|
|
ff_aac_update_ltp,
|
|
ff_aac_ltp_insert_new_frame,
|
|
set_special_band_scalefactors,
|
|
search_for_pns,
|
|
mark_pns,
|
|
ff_aac_search_for_tns,
|
|
ff_aac_search_for_ltp,
|
|
search_for_ms,
|
|
ff_aac_search_for_is,
|
|
ff_aac_search_for_pred,
|
|
},
|
|
[AAC_CODER_TWOLOOP] = {
|
|
search_for_quantizers_twoloop,
|
|
codebook_trellis_rate,
|
|
quantize_and_encode_band,
|
|
ff_aac_encode_tns_info,
|
|
ff_aac_encode_ltp_info,
|
|
ff_aac_encode_main_pred,
|
|
ff_aac_adjust_common_pred,
|
|
ff_aac_adjust_common_ltp,
|
|
ff_aac_apply_main_pred,
|
|
ff_aac_apply_tns,
|
|
ff_aac_update_ltp,
|
|
ff_aac_ltp_insert_new_frame,
|
|
set_special_band_scalefactors,
|
|
search_for_pns,
|
|
mark_pns,
|
|
ff_aac_search_for_tns,
|
|
ff_aac_search_for_ltp,
|
|
search_for_ms,
|
|
ff_aac_search_for_is,
|
|
ff_aac_search_for_pred,
|
|
},
|
|
[AAC_CODER_FAST] = {
|
|
search_for_quantizers_fast,
|
|
codebook_trellis_rate,
|
|
quantize_and_encode_band,
|
|
ff_aac_encode_tns_info,
|
|
ff_aac_encode_ltp_info,
|
|
ff_aac_encode_main_pred,
|
|
ff_aac_adjust_common_pred,
|
|
ff_aac_adjust_common_ltp,
|
|
ff_aac_apply_main_pred,
|
|
ff_aac_apply_tns,
|
|
ff_aac_update_ltp,
|
|
ff_aac_ltp_insert_new_frame,
|
|
set_special_band_scalefactors,
|
|
search_for_pns,
|
|
mark_pns,
|
|
ff_aac_search_for_tns,
|
|
ff_aac_search_for_ltp,
|
|
search_for_ms,
|
|
ff_aac_search_for_is,
|
|
ff_aac_search_for_pred,
|
|
},
|
|
};
|