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/*
* 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
*/
/** |
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* @file |
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* AAC coefficients encoder
*/
/***********************************
* TODOs:
* speedup quantizer selection
* add sane pulse detection
***********************************/
|
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#include "libavutil/libm.h" // brought forward to work around cygwin header breakage
|
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#include <float.h> |
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|
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#include "libavutil/mathematics.h" |
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#include "mathops.h" |
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#include "avcodec.h"
#include "put_bits.h"
#include "aac.h"
#include "aacenc.h"
#include "aactab.h" |
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#include "aacenctab.h" |
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#include "aacenc_utils.h" |
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#include "aacenc_quantization.h" |
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|
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#include "aacenc_is.h" |
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#include "aacenc_tns.h" |
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#include "aacenc_ltp.h" |
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#include "aacenc_pred.h" |
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|
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#include "libavcodec/aaccoder_twoloop.h"
|
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/* 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) */ |
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#define NOISE_SPREAD_THRESHOLD 0.9f |
38fd4c2e |
|
033e5894 |
/* 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 |
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|
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#include "libavcodec/aaccoder_trellis.h"
|
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/**
* 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)
{ |
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BandCodingPath path[120][CB_TOT_ALL]; |
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int w, swb, cb, start, size; |
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int i, j; |
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const int max_sfb = sce->ics.max_sfb; |
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const int run_bits = sce->ics.num_windows == 1 ? 5 : 3; |
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const int run_esc = (1 << run_bits) - 1; |
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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; |
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for (cb = 0; cb < CB_TOT_ALL; cb++) { |
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path[0][cb].cost = 0.0f; |
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path[0][cb].prev_idx = -1; |
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path[0][cb].run = 0; |
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} |
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for (swb = 0; swb < max_sfb; swb++) { |
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size = sce->ics.swb_sizes[swb]; |
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if (sce->zeroes[win*16 + swb]) { |
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for (cb = 0; cb < CB_TOT_ALL; cb++) { |
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path[swb+1][cb].prev_idx = cb; |
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path[swb+1][cb].cost = path[swb][cb].cost;
path[swb+1][cb].run = path[swb][cb].run + 1; |
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} |
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} else { |
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float minrd = next_minrd;
int mincb = next_mincb;
next_minrd = INFINITY;
next_mincb = 0; |
55397b0e |
for (cb = 0; cb < CB_TOT_ALL; cb++) { |
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float cost_stay_here, cost_get_here;
float rd = 0.0f; |
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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;
} |
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for (w = 0; w < group_len; w++) { |
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FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(win+w)*16+swb]; |
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rd += quantize_band_cost(s, &sce->coeffs[start + w*128],
&s->scoefs[start + w*128], size, |
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sce->sf_idx[(win+w)*16+swb], aac_cb_out_map[cb], |
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lambda / band->threshold, INFINITY, NULL, NULL, 0); |
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}
cost_stay_here = path[swb][cb].cost + rd;
cost_get_here = minrd + rd + run_bits + 4; |
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if ( run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run] |
99d61d34 |
!= run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run+1]) |
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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; |
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idx = 0; |
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for (cb = 1; cb < CB_TOT_ALL; cb++) |
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if (path[max_sfb][cb].cost < path[max_sfb][idx].cost) |
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idx = cb;
ppos = max_sfb; |
99d61d34 |
while (ppos > 0) { |
55397b0e |
av_assert1(idx >= 0); |
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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; |
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for (i = stack_len - 1; i >= 0; i--) { |
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cb = aac_cb_out_map[stackcb[i]];
put_bits(&s->pb, 4, cb); |
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count = stackrun[i]; |
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memset(sce->zeroes + win*16 + start, !cb, count); |
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//XXX: memset when band_type is also uint8_t |
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for (j = 0; j < count; j++) { |
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sce->band_type[win*16 + start] = cb; |
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start++;
} |
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while (count >= run_esc) { |
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put_bits(&s->pb, run_bits, run_esc);
count -= run_esc;
}
put_bits(&s->pb, run_bits, count);
}
}
|
759510e6 |
|
78e65cd7 |
typedef struct TrellisPath {
float cost;
int prev;
} TrellisPath;
|
f5e82fec |
#define TRELLIS_STAGES 121 |
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#define TRELLIS_STATES (SCALE_MAX_DIFF+1) |
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|
7c10b87b |
static void set_special_band_scalefactors(AACEncContext *s, SingleChannelElement *sce)
{ |
60a76f8b |
int w, g;
int prevscaler_n = -255, prevscaler_i = 0; |
7c10b87b |
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++) { |
60a76f8b |
if (sce->zeroes[w*16+g])
continue; |
7c10b87b |
if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) { |
b9b1fd11 |
sce->sf_idx[w*16+g] = av_clip(roundf(log2f(sce->is_ener[w*16+g])*2), -155, 100); |
7c10b87b |
bands++;
} else if (sce->band_type[w*16+g] == NOISE_BT) { |
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sce->sf_idx[w*16+g] = av_clip(3+ceilf(log2f(sce->pns_ener[w*16+g])*2), -100, 155); |
60a76f8b |
if (prevscaler_n == -255)
prevscaler_n = sce->sf_idx[w*16+g]; |
7c10b87b |
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++) { |
60a76f8b |
if (sce->zeroes[w*16+g])
continue; |
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if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) { |
60a76f8b |
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); |
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} else if (sce->band_type[w*16+g] == NOISE_BT) { |
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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); |
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}
}
}
}
|
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static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s, |
99d61d34 |
SingleChannelElement *sce,
const float lambda) |
78e65cd7 |
{
int q, w, w2, g, start = 0; |
9072c29e |
int i, j; |
78e65cd7 |
int idx; |
f5e82fec |
TrellisPath paths[TRELLIS_STAGES][TRELLIS_STATES];
int bandaddr[TRELLIS_STAGES]; |
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int minq;
float mincost; |
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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 |
293c170f |
q0 = av_clip(coef2minsf(q0f), 0, SCALE_MAX_POS-1); |
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//maximum scalefactor index is when maximum coefficient after quantizing is still not zero |
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q1 = av_clip(coef2maxsf(q1f), 1, SCALE_MAX_POS); |
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if (q1 - q0 > 60) {
int q0low = q0;
int q1high = q1;
//minimum scalefactor index is when maximum nonzero coefficient after quantizing is not clipped |
51ffd3a6 |
int qnrg = av_clip_uint8(log2f(sqrtf(qnrgf/qcnt))*4 - 31 + SCALE_ONE_POS - SCALE_DIV_512); |
144c5e3d |
q1 = qnrg + 30;
q0 = qnrg - 30;
if (q0 < q0low) {
q1 += q0low - q0;
q0 = q0low;
} else if (q1 > q1high) {
q0 -= q1 - q1high;
q1 = q1high;
}
} |
293c170f |
// 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);
} |
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|
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for (i = 0; i < TRELLIS_STATES; i++) { |
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paths[0][i].cost = 0.0f;
paths[0][i].prev = -1; |
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} |
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for (j = 1; j < TRELLIS_STAGES; j++) {
for (i = 0; i < TRELLIS_STATES; i++) { |
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paths[j][i].cost = INFINITY;
paths[j][i].prev = -2;
} |
78e65cd7 |
} |
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idx = 1; |
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abs_pow34_v(s->scoefs, sce->coeffs, 1024); |
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for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { |
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start = w*128; |
fd257dc4 |
for (g = 0; g < sce->ics.num_swb; g++) { |
32be264c |
const float *coefs = &sce->coeffs[start]; |
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float qmin, qmax;
int nz = 0;
|
9072c29e |
bandaddr[idx] = w * 16 + g; |
78e65cd7 |
qmin = INT_MAX;
qmax = 0.0f; |
fd257dc4 |
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) { |
0bc01cc9 |
FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g]; |
fd257dc4 |
if (band->energy <= band->threshold || band->threshold == 0.0f) { |
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sce->zeroes[(w+w2)*16+g] = 1;
continue;
}
sce->zeroes[(w+w2)*16+g] = 0;
nz = 1; |
fd257dc4 |
for (i = 0; i < sce->ics.swb_sizes[g]; i++) { |
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float t = fabsf(coefs[w2*128+i]); |
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if (t > 0.0f) |
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qmin = FFMIN(qmin, t);
qmax = FFMAX(qmax, t); |
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}
} |
fd257dc4 |
if (nz) { |
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int minscale, maxscale;
float minrd = INFINITY; |
9069b7d3 |
float maxval; |
78e65cd7 |
//minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped |
04d72abf |
minscale = coef2minsf(qmin); |
78e65cd7 |
//maximum scalefactor index is when maximum coefficient after quantizing is still not zero |
04d72abf |
maxscale = coef2maxsf(qmax); |
144c5e3d |
minscale = av_clip(minscale - q0, 0, TRELLIS_STATES - 1);
maxscale = av_clip(maxscale - q0, 0, TRELLIS_STATES); |
293c170f |
if (minscale == maxscale) {
maxscale = av_clip(minscale+1, 1, TRELLIS_STATES);
minscale = av_clip(maxscale-1, 0, TRELLIS_STATES - 1);
} |
9069b7d3 |
maxval = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], s->scoefs+start); |
fd257dc4 |
for (q = minscale; q < maxscale; q++) { |
acc9f51f |
float dist = 0; |
0ecfa7b7 |
int cb = find_min_book(maxval, sce->sf_idx[w*16+g]); |
fd257dc4 |
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) { |
0bc01cc9 |
FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g]; |
acc9f51f |
dist += quantize_band_cost(s, coefs + w2*128, s->scoefs + start + w2*128, sce->ics.swb_sizes[g], |
01ecb717 |
q + q0, cb, lambda / band->threshold, INFINITY, NULL, NULL, 0); |
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} |
988c1705 |
minrd = FFMIN(minrd, dist); |
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|
144c5e3d |
for (i = 0; i < q1 - q0; i++) { |
78e65cd7 |
float cost; |
9072c29e |
cost = paths[idx - 1][i].cost + dist |
78e65cd7 |
+ ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO]; |
144c5e3d |
if (cost < paths[idx][q].cost) { |
9072c29e |
paths[idx][q].cost = cost;
paths[idx][q].prev = i; |
78e65cd7 |
}
}
} |
fd257dc4 |
} else { |
144c5e3d |
for (q = 0; q < q1 - q0; q++) { |
911fbc45 |
paths[idx][q].cost = paths[idx - 1][q].cost + 1;
paths[idx][q].prev = q; |
78e65cd7 |
}
}
sce->zeroes[w*16+g] = !nz;
start += sce->ics.swb_sizes[g]; |
9072c29e |
idx++; |
78e65cd7 |
}
} |
9072c29e |
idx--;
mincost = paths[idx][0].cost;
minq = 0; |
f5e82fec |
for (i = 1; i < TRELLIS_STATES; i++) { |
9072c29e |
if (paths[idx][i].cost < mincost) {
mincost = paths[idx][i].cost;
minq = i; |
78e65cd7 |
}
} |
9072c29e |
while (idx) { |
144c5e3d |
sce->sf_idx[bandaddr[idx]] = minq + q0; |
7a4652dd |
minq = FFMAX(paths[idx][minq].prev, 0); |
9072c29e |
idx--; |
78e65cd7 |
}
//set the same quantizers inside window groups |
fd257dc4 |
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++) |
78e65cd7 |
sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
}
static void search_for_quantizers_fast(AVCodecContext *avctx, AACEncContext *s, |
99d61d34 |
SingleChannelElement *sce,
const float lambda) |
78e65cd7 |
{ |
e65ab9d9 |
int i, w, w2, g; |
78e65cd7 |
int minq = 255;
memset(sce->sf_idx, 0, sizeof(sce->sf_idx)); |
fd257dc4 |
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 = 0; w2 < sce->ics.group_len[w]; w2++) { |
0bc01cc9 |
FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g]; |
fd257dc4 |
if (band->energy <= band->threshold) { |
78e65cd7 |
sce->sf_idx[(w+w2)*16+g] = 218;
sce->zeroes[(w+w2)*16+g] = 1; |
fd257dc4 |
} else { |
51ffd3a6 |
sce->sf_idx[(w+w2)*16+g] = av_clip(SCALE_ONE_POS - SCALE_DIV_512 + log2f(band->threshold), 80, 218); |
78e65cd7 |
sce->zeroes[(w+w2)*16+g] = 0;
}
minq = FFMIN(minq, sce->sf_idx[(w+w2)*16+g]);
}
}
} |
fd257dc4 |
for (i = 0; i < 128; i++) { |
c8f47d8b |
sce->sf_idx[i] = 140;
//av_clip(sce->sf_idx[i], minq, minq + SCALE_MAX_DIFF - 1); |
78e65cd7 |
}
//set the same quantizers inside window groups |
fd257dc4 |
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++) |
78e65cd7 |
sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
}
|
6d175158 |
static void search_for_pns(AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce) |
38fd4c2e |
{ |
033e5894 |
FFPsyBand *band; |
da64bd6a |
int w, g, w2, i; |
01ecb717 |
int wlen = 1024 / sce->ics.num_windows;
int bandwidth, cutoff; |
033e5894 |
float *PNS = &s->scoefs[0*128], *PNS34 = &s->scoefs[1*128];
float *NOR34 = &s->scoefs[3*128]; |
ca203e99 |
uint8_t nextband[128]; |
6d175158 |
const float lambda = s->lambda; |
01ecb717 |
const float freq_mult = avctx->sample_rate*0.5f/wlen; |
033e5894 |
const float thr_mult = NOISE_LAMBDA_REPLACE*(100.0f/lambda); |
01ecb717 |
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; |
ca203e99 |
int prev = -1000, prev_sf = -1; |
01ecb717 |
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; |
da64bd6a |
|
9458a62d |
memcpy(sce->band_alt, sce->band_type, sizeof(sce->band_type)); |
ca203e99 |
ff_init_nextband_map(sce, nextband); |
38fd4c2e |
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { |
0f98fd30 |
int wstart = w*128; |
38fd4c2e |
for (g = 0; g < sce->ics.num_swb; g++) { |
da64bd6a |
int noise_sfi; |
033e5894 |
float dist1 = 0.0f, dist2 = 0.0f, noise_amp; |
9458a62d |
float pns_energy = 0.0f, pns_tgt_energy, energy_ratio, dist_thresh; |
01ecb717 |
float sfb_energy = 0.0f, threshold = 0.0f, spread = 2.0f;
float min_energy = -1.0f, max_energy = 0.0f; |
0f98fd30 |
const int start = wstart+sce->ics.swb_offset[g]; |
9458a62d |
const float freq = (start-wstart)*freq_mult; |
da64bd6a |
const float freq_boost = FFMAX(0.88f*freq/NOISE_LOW_LIMIT, 1.0f); |
00d481b2 |
if (freq < NOISE_LOW_LIMIT || (start-wstart) >= cutoff) {
if (!sce->zeroes[w*16+g])
prev_sf = sce->sf_idx[w*16+g]; |
033e5894 |
continue; |
00d481b2 |
} |
033e5894 |
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g]; |
b6cc8ec7 |
sfb_energy += band->energy; |
01ecb717 |
spread = FFMIN(spread, band->spread); |
b6cc8ec7 |
threshold += band->threshold; |
01ecb717 |
if (!w2) {
min_energy = max_energy = band->energy;
} else {
min_energy = FFMIN(min_energy, band->energy);
max_energy = FFMAX(max_energy, band->energy);
} |
033e5894 |
}
|
da64bd6a |
/* Ramps down at ~8000Hz and loosens the dist threshold */ |
01ecb717 |
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) |
9458a62d |
*/ |
ca203e99 |
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 || |
01ecb717 |
(!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 ) { |
da64bd6a |
sce->pns_ener[w*16+g] = sfb_energy; |
ca203e99 |
if (!sce->zeroes[w*16+g])
prev_sf = sce->sf_idx[w*16+g]; |
033e5894 |
continue;
}
|
01ecb717 |
pns_tgt_energy = sfb_energy*FFMIN(1.0f, spread*spread); |
9458a62d |
noise_sfi = av_clip(roundf(log2f(pns_tgt_energy)*2), -100, 155); /* Quantize */ |
b6cc8ec7 |
noise_amp = -ff_aac_pow2sf_tab[noise_sfi + POW_SF2_ZERO]; /* Dequantize */ |
ca203e99 |
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;
}
} |
033e5894 |
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) { |
9458a62d |
float band_energy, scale, pns_senergy; |
0f98fd30 |
const int start_c = (w+w2)*128+sce->ics.swb_offset[g]; |
da64bd6a |
band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g]; |
ade31b94 |
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];
} |
033e5894 |
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]); |
9458a62d |
pns_senergy = s->fdsp->scalarproduct_float(PNS, PNS, sce->ics.swb_sizes[g]);
pns_energy += pns_senergy; |
da64bd6a |
abs_pow34_v(NOR34, &sce->coeffs[start_c], sce->ics.swb_sizes[g]); |
033e5894 |
abs_pow34_v(PNS34, PNS, sce->ics.swb_sizes[g]); |
da64bd6a |
dist1 += quantize_band_cost(s, &sce->coeffs[start_c], |
033e5894 |
NOR34,
sce->ics.swb_sizes[g],
sce->sf_idx[(w+w2)*16+g],
sce->band_alt[(w+w2)*16+g], |
01ecb717 |
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;
} |
124c3759 |
if (g && sce->band_type[w*16+g-1] == NOISE_BT) { |
01ecb717 |
dist2 += 5;
} else {
dist2 += 9; |
033e5894 |
} |
9458a62d |
energy_ratio = pns_tgt_energy/pns_energy; /* Compensates for quantization error */
sce->pns_ener[w*16+g] = energy_ratio*pns_tgt_energy; |
01ecb717 |
if (sce->zeroes[w*16+g] || !sce->band_alt[w*16+g] || (energy_ratio > 0.85f && energy_ratio < 1.25f && dist2 < dist1)) { |
033e5894 |
sce->band_type[w*16+g] = NOISE_BT;
sce->zeroes[w*16+g] = 0; |
ca203e99 |
prev = noise_sfi; |
4720a562 |
} else {
if (!sce->zeroes[w*16+g])
prev_sf = sce->sf_idx[w*16+g]; |
38fd4c2e |
}
}
}
}
|
01ecb717 |
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;
}
}
}
}
|
6d175158 |
static void search_for_ms(AACEncContext *s, ChannelElement *cpe) |
78e65cd7 |
{ |
ca203e99 |
int start = 0, i, w, w2, g, sid_sf_boost, prev_mid, prev_side;
uint8_t nextband0[128], nextband1[128]; |
78e65cd7 |
float M[128], S[128];
float *L34 = s->scoefs, *R34 = s->scoefs + 128, *M34 = s->scoefs + 128*2, *S34 = s->scoefs + 128*3; |
6d175158 |
const float lambda = s->lambda; |
01ecb717 |
const float mslambda = FFMIN(1.0f, lambda / 120.f); |
78e65cd7 |
SingleChannelElement *sce0 = &cpe->ch[0];
SingleChannelElement *sce1 = &cpe->ch[1]; |
fd257dc4 |
if (!cpe->common_window) |
78e65cd7 |
return; |
01ecb717 |
|
ca203e99 |
/** 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]) { |
57848ef3 |
start = 0; |
fd257dc4 |
for (g = 0; g < sce0->ics.num_swb; g++) { |
01ecb717 |
float bmax = bval2bmax(g * 17.0f / sce0->ics.num_swb) / 0.0045f; |
6711aa21 |
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]) { |
01ecb717 |
float Mmax = 0.0f, Smax = 0.0f;
/* Must compute mid/side SF and book for the whole window group */ |
fd257dc4 |
for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
for (i = 0; i < sce0->ics.swb_sizes[g]; i++) { |
32be264c |
M[i] = (sce0->coeffs[start+(w+w2)*128+i]
+ sce1->coeffs[start+(w+w2)*128+i]) * 0.5; |
92efa2bd |
S[i] = M[i] |
32be264c |
- sce1->coeffs[start+(w+w2)*128+i]; |
78e65cd7 |
} |
01ecb717 |
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]); |
ca203e99 |
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); |
6711aa21 |
if (sce0->band_type[w*16+g] != NOISE_BT && sce1->band_type[w*16+g] != NOISE_BT |
ca203e99 |
&& ( !ff_sfdelta_can_replace(sce0, nextband0, prev_mid, mididx, w*16+g)
|| !ff_sfdelta_can_replace(sce1, nextband1, prev_side, sididx, w*16+g))) { |
01ecb717 |
/* scalefactor range violation, bad stuff, will decrease quality unacceptably */
continue;
}
|
ca203e99 |
midcb = find_min_book(Mmax, mididx);
sidcb = find_min_book(Smax, sididx);
|
01ecb717 |
/* 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], |
6711aa21 |
sce0->sf_idx[w*16+g],
sce0->band_type[w*16+g], |
01ecb717 |
lambda / band0->threshold, INFINITY, &b1, NULL, 0);
dist1 += quantize_band_cost(s, &sce1->coeffs[start + (w+w2)*128],
R34,
sce1->ics.swb_sizes[g], |
6711aa21 |
sce1->sf_idx[w*16+g],
sce1->band_type[w*16+g], |
01ecb717 |
lambda / band1->threshold, INFINITY, &b2, NULL, 0);
dist2 += quantize_band_cost(s, M,
M34,
sce0->ics.swb_sizes[g], |
6711aa21 |
mididx,
midcb, |
01ecb717 |
lambda / minthr, INFINITY, &b3, NULL, 0);
dist2 += quantize_band_cost(s, S,
S34,
sce1->ics.swb_sizes[g], |
6711aa21 |
sididx,
sidcb, |
01ecb717 |
mslambda / (minthr * bmax), INFINITY, &b4, NULL, 0);
B0 += b1+b2;
B1 += b3+b4; |
6711aa21 |
dist1 -= b1+b2;
dist2 -= b3+b4; |
01ecb717 |
}
cpe->ms_mask[w*16+g] = dist2 <= dist1 && B1 < B0;
if (cpe->ms_mask[w*16+g]) { |
6711aa21 |
if (sce0->band_type[w*16+g] != NOISE_BT && sce1->band_type[w*16+g] != NOISE_BT) { |
01ecb717 |
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; |
6711aa21 |
} 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; |
01ecb717 |
}
break;
} else if (B1 > B0) {
/* More boost won't fix this */
break;
} |
78e65cd7 |
}
} |
ca203e99 |
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]; |
78e65cd7 |
start += sce0->ics.swb_sizes[g];
}
}
}
|
1b122387 |
AACCoefficientsEncoder ff_aac_coders[AAC_CODER_NB] = { |
4bd910d8 |
[AAC_CODER_ANMR] = { |
78e65cd7 |
search_for_quantizers_anmr,
encode_window_bands_info,
quantize_and_encode_band, |
21dd5279 |
ff_aac_encode_tns_info, |
27d23ae0 |
ff_aac_encode_ltp_info, |
21dd5279 |
ff_aac_encode_main_pred, |
93e6b23c |
ff_aac_adjust_common_pred, |
27d23ae0 |
ff_aac_adjust_common_ltp, |
21dd5279 |
ff_aac_apply_main_pred, |
f20b6717 |
ff_aac_apply_tns, |
27d23ae0 |
ff_aac_update_ltp,
ff_aac_ltp_insert_new_frame, |
e06578e3 |
set_special_band_scalefactors, |
38fd4c2e |
search_for_pns, |
01ecb717 |
mark_pns, |
21dd5279 |
ff_aac_search_for_tns, |
27d23ae0 |
ff_aac_search_for_ltp, |
dd0e43e4 |
search_for_ms, |
21dd5279 |
ff_aac_search_for_is,
ff_aac_search_for_pred, |
78e65cd7 |
}, |
4bd910d8 |
[AAC_CODER_TWOLOOP] = { |
78e65cd7 |
search_for_quantizers_twoloop, |
759510e6 |
codebook_trellis_rate, |
78e65cd7 |
quantize_and_encode_band, |
21dd5279 |
ff_aac_encode_tns_info, |
27d23ae0 |
ff_aac_encode_ltp_info, |
21dd5279 |
ff_aac_encode_main_pred, |
93e6b23c |
ff_aac_adjust_common_pred, |
27d23ae0 |
ff_aac_adjust_common_ltp, |
21dd5279 |
ff_aac_apply_main_pred, |
f20b6717 |
ff_aac_apply_tns, |
27d23ae0 |
ff_aac_update_ltp,
ff_aac_ltp_insert_new_frame, |
e06578e3 |
set_special_band_scalefactors, |
38fd4c2e |
search_for_pns, |
01ecb717 |
mark_pns, |
21dd5279 |
ff_aac_search_for_tns, |
27d23ae0 |
ff_aac_search_for_ltp, |
dd0e43e4 |
search_for_ms, |
21dd5279 |
ff_aac_search_for_is,
ff_aac_search_for_pred, |
78e65cd7 |
}, |
4bd910d8 |
[AAC_CODER_FAST] = { |
78e65cd7 |
search_for_quantizers_fast,
encode_window_bands_info,
quantize_and_encode_band, |
21dd5279 |
ff_aac_encode_tns_info, |
27d23ae0 |
ff_aac_encode_ltp_info, |
21dd5279 |
ff_aac_encode_main_pred, |
93e6b23c |
ff_aac_adjust_common_pred, |
27d23ae0 |
ff_aac_adjust_common_ltp, |
21dd5279 |
ff_aac_apply_main_pred, |
f20b6717 |
ff_aac_apply_tns, |
27d23ae0 |
ff_aac_update_ltp,
ff_aac_ltp_insert_new_frame, |
e06578e3 |
set_special_band_scalefactors, |
38fd4c2e |
search_for_pns, |
01ecb717 |
mark_pns, |
21dd5279 |
ff_aac_search_for_tns, |
27d23ae0 |
ff_aac_search_for_ltp, |
dd0e43e4 |
search_for_ms, |
21dd5279 |
ff_aac_search_for_is,
ff_aac_search_for_pred, |
78e65cd7 |
},
}; |