ffmpeg / libavcodec / aaccoder.c @ 00f0b4b9
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/*


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* AAC coefficients encoder

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* Copyright (C) 20082009 Konstantin Shishkov

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*

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* This file is part of Libav.

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*

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* Libav is free software; you can redistribute it and/or

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* modify it under the terms of the GNU Lesser General Public

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* License as published by the Free Software Foundation; either

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* version 2.1 of the License, or (at your option) any later version.

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*

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* Libav is distributed in the hope that it will be useful,

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* but WITHOUT ANY WARRANTY; without even the implied warranty of

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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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* Lesser General Public License for more details.

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*

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* You should have received a copy of the GNU Lesser General Public

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* License along with Libav; if not, write to the Free Software

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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 021101301 USA

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*/

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/**

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* @file

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* AAC coefficients encoder

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*/

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/***********************************

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* TODOs:

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* speedup quantizer selection

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* add sane pulse detection

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***********************************/

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#include <float.h> 
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#include "avcodec.h" 
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#include "put_bits.h" 
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#include "aac.h" 
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#include "aacenc.h" 
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#include "aactab.h" 
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/** bits needed to code codebook run value for long windows */

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static const uint8_t run_value_bits_long[64] = { 
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5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 
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5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 10, 
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10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 
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10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 15 
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}; 
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/** bits needed to code codebook run value for short windows */

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static const uint8_t run_value_bits_short[16] = { 
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3, 3, 3, 3, 3, 3, 3, 6, 6, 6, 6, 6, 6, 6, 6, 9 
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}; 
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static const uint8_t *run_value_bits[2] = { 
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run_value_bits_long, run_value_bits_short 
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}; 
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/**

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* Quantize one coefficient.

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* @return absolute value of the quantized coefficient

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* @see 3GPP TS26.403 5.6.2 "Scalefactor determination"

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*/

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static av_always_inline int quant(float coef, const float Q) 
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{ 
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float a = coef * Q;

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return sqrtf(a * sqrtf(a)) + 0.4054; 
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} 
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static void quantize_bands(int *out, const float *in, const float *scaled, 
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int size, float Q34, int is_signed, int maxval) 
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{ 
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int i;

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double qc;

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for (i = 0; i < size; i++) { 
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qc = scaled[i] * Q34; 
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out[i] = (int)FFMIN(qc + 0.4054, (double)maxval); 
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if (is_signed && in[i] < 0.0f) { 
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out[i] = out[i]; 
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} 
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} 
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} 
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static void abs_pow34_v(float *out, const float *in, const int size) 
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{ 
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#ifndef USE_REALLY_FULL_SEARCH

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int i;

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for (i = 0; i < size; i++) { 
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float a = fabsf(in[i]);

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out[i] = sqrtf(a * sqrtf(a)); 
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} 
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#endif /* USE_REALLY_FULL_SEARCH */ 
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} 
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static const uint8_t aac_cb_range [12] = {0, 3, 3, 3, 3, 9, 9, 8, 8, 13, 13, 17}; 
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static const uint8_t aac_cb_maxval[12] = {0, 1, 1, 2, 2, 4, 4, 7, 7, 12, 12, 16}; 
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/**

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* Calculate rate distortion cost for quantizing with given codebook

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*

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* @return quantization distortion

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*/

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static av_always_inline float quantize_and_encode_band_cost_template( 
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struct AACEncContext *s,

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PutBitContext *pb, const float *in, 
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const float *scaled, int size, int scale_idx, 
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int cb, const float lambda, const float uplim, 
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int *bits, int BT_ZERO, int BT_UNSIGNED, 
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int BT_PAIR, int BT_ESC) 
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{ 
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const float IQ = ff_aac_pow2sf_tab[200 + scale_idx  SCALE_ONE_POS + SCALE_DIV_512]; 
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const float Q = ff_aac_pow2sf_tab[200  scale_idx + SCALE_ONE_POS  SCALE_DIV_512]; 
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const float CLIPPED_ESCAPE = 165140.0f*IQ; 
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int i, j, k;

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float cost = 0; 
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const int dim = BT_PAIR ? 2 : 4; 
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int resbits = 0; 
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const float Q34 = sqrtf(Q * sqrtf(Q)); 
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const int range = aac_cb_range[cb]; 
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const int maxval = aac_cb_maxval[cb]; 
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int off;

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if (BT_ZERO) {

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for (i = 0; i < size; i++) 
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cost += in[i]*in[i]; 
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if (bits)

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*bits = 0;

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return cost * lambda;

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} 
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if (!scaled) {

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abs_pow34_v(s>scoefs, in, size); 
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scaled = s>scoefs; 
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} 
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quantize_bands(s>qcoefs, in, scaled, size, Q34, !BT_UNSIGNED, maxval); 
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if (BT_UNSIGNED) {

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off = 0;

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} else {

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off = maxval; 
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} 
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for (i = 0; i < size; i += dim) { 
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const float *vec; 
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int *quants = s>qcoefs + i;

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int curidx = 0; 
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int curbits;

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float rd = 0.0f; 
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for (j = 0; j < dim; j++) { 
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curidx *= range; 
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curidx += quants[j] + off; 
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} 
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curbits = ff_aac_spectral_bits[cb1][curidx];

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vec = &ff_aac_codebook_vectors[cb1][curidx*dim];

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if (BT_UNSIGNED) {

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for (k = 0; k < dim; k++) { 
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float t = fabsf(in[i+k]);

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float di;

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if (BT_ESC && vec[k] == 64.0f) { //FIXME: slow 
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if (t >= CLIPPED_ESCAPE) {

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di = t  CLIPPED_ESCAPE; 
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curbits += 21;

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} else {

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int c = av_clip(quant(t, Q), 0, 8191); 
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di = t  c*cbrtf(c)*IQ; 
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curbits += av_log2(c)*2  4 + 1; 
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} 
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} else {

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di = t  vec[k]*IQ; 
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} 
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if (vec[k] != 0.0f) 
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curbits++; 
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rd += di*di; 
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} 
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} else {

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for (k = 0; k < dim; k++) { 
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float di = in[i+k]  vec[k]*IQ;

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rd += di*di; 
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} 
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} 
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cost += rd * lambda + curbits; 
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resbits += curbits; 
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if (cost >= uplim)

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return uplim;

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if (pb) {

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put_bits(pb, ff_aac_spectral_bits[cb1][curidx], ff_aac_spectral_codes[cb1][curidx]); 
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if (BT_UNSIGNED)

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for (j = 0; j < dim; j++) 
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if (ff_aac_codebook_vectors[cb1][curidx*dim+j] != 0.0f) 
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put_bits(pb, 1, in[i+j] < 0.0f); 
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if (BT_ESC) {

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for (j = 0; j < 2; j++) { 
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if (ff_aac_codebook_vectors[cb1][curidx*2+j] == 64.0f) { 
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int coef = av_clip(quant(fabsf(in[i+j]), Q), 0, 8191); 
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int len = av_log2(coef);

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put_bits(pb, len  4 + 1, (1 << (len  4 + 1))  2); 
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put_bits(pb, len, coef & ((1 << len)  1)); 
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} 
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} 
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} 
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} 
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} 
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if (bits)

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*bits = resbits; 
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return cost;

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} 
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#define QUANTIZE_AND_ENCODE_BAND_COST_FUNC(NAME, BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC) \

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static float quantize_and_encode_band_cost_ ## NAME( \ 
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struct AACEncContext *s, \

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PutBitContext *pb, const float *in, \ 
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const float *scaled, int size, int scale_idx, \ 
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int cb, const float lambda, const float uplim, \ 
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int *bits) { \

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return quantize_and_encode_band_cost_template( \

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s, pb, in, scaled, size, scale_idx, \ 
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BT_ESC ? ESC_BT : cb, lambda, uplim, bits, \ 
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BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC); \ 
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} 
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QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ZERO, 1, 0, 0, 0) 
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QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SQUAD, 0, 0, 0, 0) 
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QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UQUAD, 0, 1, 0, 0) 
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QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SPAIR, 0, 0, 1, 0) 
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QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UPAIR, 0, 1, 1, 0) 
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QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ESC, 0, 1, 1, 1) 
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static float (*const quantize_and_encode_band_cost_arr[])( 
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struct AACEncContext *s,

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PutBitContext *pb, const float *in, 
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const float *scaled, int size, int scale_idx, 
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int cb, const float lambda, const float uplim, 
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int *bits) = {

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quantize_and_encode_band_cost_ZERO, 
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quantize_and_encode_band_cost_SQUAD, 
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quantize_and_encode_band_cost_SQUAD, 
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quantize_and_encode_band_cost_UQUAD, 
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quantize_and_encode_band_cost_UQUAD, 
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quantize_and_encode_band_cost_SPAIR, 
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quantize_and_encode_band_cost_SPAIR, 
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quantize_and_encode_band_cost_UPAIR, 
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quantize_and_encode_band_cost_UPAIR, 
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quantize_and_encode_band_cost_UPAIR, 
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quantize_and_encode_band_cost_UPAIR, 
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quantize_and_encode_band_cost_ESC, 
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}; 
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#define quantize_and_encode_band_cost( \

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s, pb, in, scaled, size, scale_idx, cb, \ 
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lambda, uplim, bits) \ 
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quantize_and_encode_band_cost_arr[cb]( \ 
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s, pb, in, scaled, size, scale_idx, cb, \ 
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lambda, uplim, bits) 
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static float quantize_band_cost(struct AACEncContext *s, const float *in, 
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const float *scaled, int size, int scale_idx, 
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int cb, const float lambda, const float uplim, 
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int *bits)

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{ 
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return quantize_and_encode_band_cost(s, NULL, in, scaled, size, scale_idx, 
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cb, lambda, uplim, bits); 
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} 
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262 
static void quantize_and_encode_band(struct AACEncContext *s, PutBitContext *pb, 
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const float *in, int size, int scale_idx, 
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int cb, const float lambda) 
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{ 
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quantize_and_encode_band_cost(s, pb, in, NULL, size, scale_idx, cb, lambda,

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INFINITY, NULL);

268 
} 
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static float find_max_val(int group_len, int swb_size, const float *scaled) { 
271 
float maxval = 0.0f; 
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int w2, i;

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for (w2 = 0; w2 < group_len; w2++) { 
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for (i = 0; i < swb_size; i++) { 
275 
maxval = FFMAX(maxval, scaled[w2*128+i]);

276 
} 
277 
} 
278 
return maxval;

279 
} 
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281 
static int find_min_book(float maxval, int sf) { 
282 
float Q = ff_aac_pow2sf_tab[200  sf + SCALE_ONE_POS  SCALE_DIV_512]; 
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float Q34 = sqrtf(Q * sqrtf(Q));

284 
int qmaxval, cb;

285 
qmaxval = maxval * Q34 + 0.4054f; 
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if (qmaxval == 0) cb = 0; 
287 
else if (qmaxval == 1) cb = 1; 
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else if (qmaxval == 2) cb = 3; 
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else if (qmaxval <= 4) cb = 5; 
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else if (qmaxval <= 7) cb = 7; 
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else if (qmaxval <= 12) cb = 9; 
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else cb = 11; 
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return cb;

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} 
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/**

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* structure used in optimal codebook search

298 
*/

299 
typedef struct BandCodingPath { 
300 
int prev_idx; ///< pointer to the previous path point 
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float cost; ///< path cost 
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int run;

303 
} BandCodingPath; 
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/**

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* Encode band info for single window group bands.

307 
*/

308 
static void encode_window_bands_info(AACEncContext *s, SingleChannelElement *sce, 
309 
int win, int group_len, const float lambda) 
310 
{ 
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BandCodingPath path[120][12]; 
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int w, swb, cb, start, start2, size;

313 
int i, j;

314 
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;

318 
int stackrun[120], stackcb[120], stack_len; 
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float next_minrd = INFINITY;

320 
int next_mincb = 0; 
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322 
abs_pow34_v(s>scoefs, sce>coeffs, 1024);

323 
start = win*128;

324 
for (cb = 0; cb < 12; 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; 
328 
} 
329 
for (swb = 0; swb < max_sfb; swb++) { 
330 
start2 = start; 
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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 < 12; 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;

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path[swb+1][cb].run = path[swb][cb].run + 1; 
337 
} 
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} else {

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float minrd = next_minrd;

340 
int mincb = next_mincb;

341 
next_minrd = INFINITY; 
342 
next_mincb = 0;

343 
for (cb = 0; cb < 12; cb++) { 
344 
float cost_stay_here, cost_get_here;

345 
float rd = 0.0f; 
346 
for (w = 0; w < group_len; w++) { 
347 
FFPsyBand *band = &s>psy.psy_bands[s>cur_channel*PSY_MAX_BANDS+(win+w)*16+swb];

348 
rd += quantize_band_cost(s, sce>coeffs + start + w*128,

349 
s>scoefs + start + w*128, size,

350 
sce>sf_idx[(win+w)*16+swb], cb,

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lambda / band>threshold, INFINITY, NULL);

352 
} 
353 
cost_stay_here = path[swb][cb].cost + rd; 
354 
cost_get_here = minrd + rd + run_bits + 4;

355 
if ( run_value_bits[sce>ics.num_windows == 8][path[swb][cb].run] 
356 
!= run_value_bits[sce>ics.num_windows == 8][path[swb][cb].run+1]) 
357 
cost_stay_here += run_bits; 
358 
if (cost_get_here < cost_stay_here) {

359 
path[swb+1][cb].prev_idx = mincb;

360 
path[swb+1][cb].cost = cost_get_here;

361 
path[swb+1][cb].run = 1; 
362 
} else {

363 
path[swb+1][cb].prev_idx = cb;

364 
path[swb+1][cb].cost = cost_stay_here;

365 
path[swb+1][cb].run = path[swb][cb].run + 1; 
366 
} 
367 
if (path[swb+1][cb].cost < next_minrd) { 
368 
next_minrd = path[swb+1][cb].cost;

369 
next_mincb = cb; 
370 
} 
371 
} 
372 
} 
373 
start += sce>ics.swb_sizes[swb]; 
374 
} 
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376 
//convert resulting path from backwardlinked list

377 
stack_len = 0;

378 
idx = 0;

379 
for (cb = 1; cb < 12; cb++) 
380 
if (path[max_sfb][cb].cost < path[max_sfb][idx].cost)

381 
idx = cb; 
382 
ppos = max_sfb; 
383 
while (ppos > 0) { 
384 
cb = idx; 
385 
stackrun[stack_len] = path[ppos][cb].run; 
386 
stackcb [stack_len] = cb; 
387 
idx = path[ppospath[ppos][cb].run+1][cb].prev_idx;

388 
ppos = path[ppos][cb].run; 
389 
stack_len++; 
390 
} 
391 
//perform actual band info encoding

392 
start = 0;

393 
for (i = stack_len  1; i >= 0; i) { 
394 
put_bits(&s>pb, 4, stackcb[i]);

395 
count = stackrun[i]; 
396 
memset(sce>zeroes + win*16 + start, !stackcb[i], count);

397 
//XXX: memset when band_type is also uint8_t

398 
for (j = 0; j < count; j++) { 
399 
sce>band_type[win*16 + start] = stackcb[i];

400 
start++; 
401 
} 
402 
while (count >= run_esc) {

403 
put_bits(&s>pb, run_bits, run_esc); 
404 
count = run_esc; 
405 
} 
406 
put_bits(&s>pb, run_bits, count); 
407 
} 
408 
} 
409  
410 
static void codebook_trellis_rate(AACEncContext *s, SingleChannelElement *sce, 
411 
int win, int group_len, const float lambda) 
412 
{ 
413 
BandCodingPath path[120][12]; 
414 
int w, swb, cb, start, start2, size;

415 
int i, j;

416 
const int max_sfb = sce>ics.max_sfb; 
417 
const int run_bits = sce>ics.num_windows == 1 ? 5 : 3; 
418 
const int run_esc = (1 << run_bits)  1; 
419 
int idx, ppos, count;

420 
int stackrun[120], stackcb[120], stack_len; 
421 
float next_minrd = INFINITY;

422 
int next_mincb = 0; 
423  
424 
abs_pow34_v(s>scoefs, sce>coeffs, 1024);

425 
start = win*128;

426 
for (cb = 0; cb < 12; cb++) { 
427 
path[0][cb].cost = run_bits+4; 
428 
path[0][cb].prev_idx = 1; 
429 
path[0][cb].run = 0; 
430 
} 
431 
for (swb = 0; swb < max_sfb; swb++) { 
432 
start2 = start; 
433 
size = sce>ics.swb_sizes[swb]; 
434 
if (sce>zeroes[win*16 + swb]) { 
435 
for (cb = 0; cb < 12; cb++) { 
436 
path[swb+1][cb].prev_idx = cb;

437 
path[swb+1][cb].cost = path[swb][cb].cost;

438 
path[swb+1][cb].run = path[swb][cb].run + 1; 
439 
} 
440 
} else {

441 
float minrd = next_minrd;

442 
int mincb = next_mincb;

443 
int startcb = sce>band_type[win*16+swb]; 
444 
next_minrd = INFINITY; 
445 
next_mincb = 0;

446 
for (cb = 0; cb < startcb; cb++) { 
447 
path[swb+1][cb].cost = 61450; 
448 
path[swb+1][cb].prev_idx = 1; 
449 
path[swb+1][cb].run = 0; 
450 
} 
451 
for (cb = startcb; cb < 12; cb++) { 
452 
float cost_stay_here, cost_get_here;

453 
float rd = 0.0f; 
454 
for (w = 0; w < group_len; w++) { 
455 
rd += quantize_band_cost(s, sce>coeffs + start + w*128,

456 
s>scoefs + start + w*128, size,

457 
sce>sf_idx[(win+w)*16+swb], cb,

458 
0, INFINITY, NULL); 
459 
} 
460 
cost_stay_here = path[swb][cb].cost + rd; 
461 
cost_get_here = minrd + rd + run_bits + 4;

462 
if ( run_value_bits[sce>ics.num_windows == 8][path[swb][cb].run] 
463 
!= run_value_bits[sce>ics.num_windows == 8][path[swb][cb].run+1]) 
464 
cost_stay_here += run_bits; 
465 
if (cost_get_here < cost_stay_here) {

466 
path[swb+1][cb].prev_idx = mincb;

467 
path[swb+1][cb].cost = cost_get_here;

468 
path[swb+1][cb].run = 1; 
469 
} else {

470 
path[swb+1][cb].prev_idx = cb;

471 
path[swb+1][cb].cost = cost_stay_here;

472 
path[swb+1][cb].run = path[swb][cb].run + 1; 
473 
} 
474 
if (path[swb+1][cb].cost < next_minrd) { 
475 
next_minrd = path[swb+1][cb].cost;

476 
next_mincb = cb; 
477 
} 
478 
} 
479 
} 
480 
start += sce>ics.swb_sizes[swb]; 
481 
} 
482  
483 
//convert resulting path from backwardlinked list

484 
stack_len = 0;

485 
idx = 0;

486 
for (cb = 1; cb < 12; cb++) 
487 
if (path[max_sfb][cb].cost < path[max_sfb][idx].cost)

488 
idx = cb; 
489 
ppos = max_sfb; 
490 
while (ppos > 0) { 
491 
assert(idx >= 0);

492 
cb = idx; 
493 
stackrun[stack_len] = path[ppos][cb].run; 
494 
stackcb [stack_len] = cb; 
495 
idx = path[ppospath[ppos][cb].run+1][cb].prev_idx;

496 
ppos = path[ppos][cb].run; 
497 
stack_len++; 
498 
} 
499 
//perform actual band info encoding

500 
start = 0;

501 
for (i = stack_len  1; i >= 0; i) { 
502 
put_bits(&s>pb, 4, stackcb[i]);

503 
count = stackrun[i]; 
504 
memset(sce>zeroes + win*16 + start, !stackcb[i], count);

505 
//XXX: memset when band_type is also uint8_t

506 
for (j = 0; j < count; j++) { 
507 
sce>band_type[win*16 + start] = stackcb[i];

508 
start++; 
509 
} 
510 
while (count >= run_esc) {

511 
put_bits(&s>pb, run_bits, run_esc); 
512 
count = run_esc; 
513 
} 
514 
put_bits(&s>pb, run_bits, count); 
515 
} 
516 
} 
517  
518 
/** Return the minimum scalefactor where the quantized coef does not clip. */

519 
static av_always_inline uint8_t coef2minsf(float coef) { 
520 
return av_clip_uint8(log2f(coef)*4  69 + SCALE_ONE_POS  SCALE_DIV_512); 
521 
} 
522  
523 
/** Return the maximum scalefactor where the quantized coef is not zero. */

524 
static av_always_inline uint8_t coef2maxsf(float coef) { 
525 
return av_clip_uint8(log2f(coef)*4 + 6 + SCALE_ONE_POS  SCALE_DIV_512); 
526 
} 
527  
528 
typedef struct TrellisPath { 
529 
float cost;

530 
int prev;

531 
} TrellisPath; 
532  
533 
#define TRELLIS_STAGES 121 
534 
#define TRELLIS_STATES (SCALE_MAX_DIFF+1) 
535  
536 
static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s, 
537 
SingleChannelElement *sce, 
538 
const float lambda) 
539 
{ 
540 
int q, w, w2, g, start = 0; 
541 
int i, j;

542 
int idx;

543 
TrellisPath paths[TRELLIS_STAGES][TRELLIS_STATES]; 
544 
int bandaddr[TRELLIS_STAGES];

545 
int minq;

546 
float mincost;

547 
float q0f = FLT_MAX, q1f = 0.0f, qnrgf = 0.0f; 
548 
int q0, q1, qcnt = 0; 
549  
550 
for (i = 0; i < 1024; i++) { 
551 
float t = fabsf(sce>coeffs[i]);

552 
if (t > 0.0f) { 
553 
q0f = FFMIN(q0f, t); 
554 
q1f = FFMAX(q1f, t); 
555 
qnrgf += t*t; 
556 
qcnt++; 
557 
} 
558 
} 
559  
560 
if (!qcnt) {

561 
memset(sce>sf_idx, 0, sizeof(sce>sf_idx)); 
562 
memset(sce>zeroes, 1, sizeof(sce>zeroes)); 
563 
return;

564 
} 
565  
566 
//minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped

567 
q0 = coef2minsf(q0f); 
568 
//maximum scalefactor index is when maximum coefficient after quantizing is still not zero

569 
q1 = coef2maxsf(q1f); 
570 
//av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);

571 
if (q1  q0 > 60) { 
572 
int q0low = q0;

573 
int q1high = q1;

574 
//minimum scalefactor index is when maximum nonzero coefficient after quantizing is not clipped

575 
int qnrg = av_clip_uint8(log2f(sqrtf(qnrgf/qcnt))*4  31 + SCALE_ONE_POS  SCALE_DIV_512); 
576 
q1 = qnrg + 30;

577 
q0 = qnrg  30;

578 
//av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);

579 
if (q0 < q0low) {

580 
q1 += q0low  q0; 
581 
q0 = q0low; 
582 
} else if (q1 > q1high) { 
583 
q0 = q1  q1high; 
584 
q1 = q1high; 
585 
} 
586 
} 
587 
//av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);

588  
589 
for (i = 0; i < TRELLIS_STATES; i++) { 
590 
paths[0][i].cost = 0.0f; 
591 
paths[0][i].prev = 1; 
592 
} 
593 
for (j = 1; j < TRELLIS_STAGES; j++) { 
594 
for (i = 0; i < TRELLIS_STATES; i++) { 
595 
paths[j][i].cost = INFINITY; 
596 
paths[j][i].prev = 2;

597 
} 
598 
} 
599 
idx = 1;

600 
abs_pow34_v(s>scoefs, sce>coeffs, 1024);

601 
for (w = 0; w < sce>ics.num_windows; w += sce>ics.group_len[w]) { 
602 
start = w*128;

603 
for (g = 0; g < sce>ics.num_swb; g++) { 
604 
const float *coefs = sce>coeffs + start; 
605 
float qmin, qmax;

606 
int nz = 0; 
607  
608 
bandaddr[idx] = w * 16 + g;

609 
qmin = INT_MAX; 
610 
qmax = 0.0f; 
611 
for (w2 = 0; w2 < sce>ics.group_len[w]; w2++) { 
612 
FFPsyBand *band = &s>psy.psy_bands[s>cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];

613 
if (band>energy <= band>threshold  band>threshold == 0.0f) { 
614 
sce>zeroes[(w+w2)*16+g] = 1; 
615 
continue;

616 
} 
617 
sce>zeroes[(w+w2)*16+g] = 0; 
618 
nz = 1;

619 
for (i = 0; i < sce>ics.swb_sizes[g]; i++) { 
620 
float t = fabsf(coefs[w2*128+i]); 
621 
if (t > 0.0f) 
622 
qmin = FFMIN(qmin, t); 
623 
qmax = FFMAX(qmax, t); 
624 
} 
625 
} 
626 
if (nz) {

627 
int minscale, maxscale;

628 
float minrd = INFINITY;

629 
float maxval;

630 
//minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped

631 
minscale = coef2minsf(qmin); 
632 
//maximum scalefactor index is when maximum coefficient after quantizing is still not zero

633 
maxscale = coef2maxsf(qmax); 
634 
minscale = av_clip(minscale  q0, 0, TRELLIS_STATES  1); 
635 
maxscale = av_clip(maxscale  q0, 0, TRELLIS_STATES);

636 
maxval = find_max_val(sce>ics.group_len[w], sce>ics.swb_sizes[g], s>scoefs+start); 
637 
for (q = minscale; q < maxscale; q++) {

638 
float dist = 0; 
639 
int cb = find_min_book(maxval, sce>sf_idx[w*16+g]); 
640 
for (w2 = 0; w2 < sce>ics.group_len[w]; w2++) { 
641 
FFPsyBand *band = &s>psy.psy_bands[s>cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];

642 
dist += quantize_band_cost(s, coefs + w2*128, s>scoefs + start + w2*128, sce>ics.swb_sizes[g], 
643 
q + q0, cb, lambda / band>threshold, INFINITY, NULL);

644 
} 
645 
minrd = FFMIN(minrd, dist); 
646  
647 
for (i = 0; i < q1  q0; i++) { 
648 
float cost;

649 
cost = paths[idx  1][i].cost + dist

650 
+ ff_aac_scalefactor_bits[q  i + SCALE_DIFF_ZERO]; 
651 
if (cost < paths[idx][q].cost) {

652 
paths[idx][q].cost = cost; 
653 
paths[idx][q].prev = i; 
654 
} 
655 
} 
656 
} 
657 
} else {

658 
for (q = 0; q < q1  q0; q++) { 
659 
paths[idx][q].cost = paths[idx  1][q].cost + 1; 
660 
paths[idx][q].prev = q; 
661 
} 
662 
} 
663 
sce>zeroes[w*16+g] = !nz;

664 
start += sce>ics.swb_sizes[g]; 
665 
idx++; 
666 
} 
667 
} 
668 
idx; 
669 
mincost = paths[idx][0].cost;

670 
minq = 0;

671 
for (i = 1; i < TRELLIS_STATES; i++) { 
672 
if (paths[idx][i].cost < mincost) {

673 
mincost = paths[idx][i].cost; 
674 
minq = i; 
675 
} 
676 
} 
677 
while (idx) {

678 
sce>sf_idx[bandaddr[idx]] = minq + q0; 
679 
minq = paths[idx][minq].prev; 
680 
idx; 
681 
} 
682 
//set the same quantizers inside window groups

683 
for (w = 0; w < sce>ics.num_windows; w += sce>ics.group_len[w]) 
684 
for (g = 0; g < sce>ics.num_swb; g++) 
685 
for (w2 = 1; w2 < sce>ics.group_len[w]; w2++) 
686 
sce>sf_idx[(w+w2)*16+g] = sce>sf_idx[w*16+g]; 
687 
} 
688  
689 
/**

690 
* twoloop quantizers search taken from ISO 138187 Appendix C

691 
*/

692 
static void search_for_quantizers_twoloop(AVCodecContext *avctx, 
693 
AACEncContext *s, 
694 
SingleChannelElement *sce, 
695 
const float lambda) 
696 
{ 
697 
int start = 0, i, w, w2, g; 
698 
int destbits = avctx>bit_rate * 1024.0 / avctx>sample_rate / avctx>channels; 
699 
float dists[128], uplims[128]; 
700 
float maxvals[128]; 
701 
int fflag, minscaler;

702 
int its = 0; 
703 
int allz = 0; 
704 
float minthr = INFINITY;

705  
706 
//XXX: some heuristic to determine initial quantizers will reduce search time

707 
memset(dists, 0, sizeof(dists)); 
708 
//determine zero bands and upper limits

709 
for (w = 0; w < sce>ics.num_windows; w += sce>ics.group_len[w]) { 
710 
for (g = 0; g < sce>ics.num_swb; g++) { 
711 
int nz = 0; 
712 
float uplim = 0.0f; 
713 
for (w2 = 0; w2 < sce>ics.group_len[w]; w2++) { 
714 
FFPsyBand *band = &s>psy.psy_bands[s>cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];

715 
uplim += band>threshold; 
716 
if (band>energy <= band>threshold  band>threshold == 0.0f) { 
717 
sce>zeroes[(w+w2)*16+g] = 1; 
718 
continue;

719 
} 
720 
nz = 1;

721 
} 
722 
uplims[w*16+g] = uplim *512; 
723 
sce>zeroes[w*16+g] = !nz;

724 
if (nz)

725 
minthr = FFMIN(minthr, uplim); 
726 
allz = nz; 
727 
} 
728 
} 
729 
for (w = 0; w < sce>ics.num_windows; w += sce>ics.group_len[w]) { 
730 
for (g = 0; g < sce>ics.num_swb; g++) { 
731 
if (sce>zeroes[w*16+g]) { 
732 
sce>sf_idx[w*16+g] = SCALE_ONE_POS;

733 
continue;

734 
} 
735 
sce>sf_idx[w*16+g] = SCALE_ONE_POS + FFMIN(log2f(uplims[w*16+g]/minthr)*4,59); 
736 
} 
737 
} 
738  
739 
if (!allz)

740 
return;

741 
abs_pow34_v(s>scoefs, sce>coeffs, 1024);

742  
743 
for (w = 0; w < sce>ics.num_windows; w += sce>ics.group_len[w]) { 
744 
start = w*128;

745 
for (g = 0; g < sce>ics.num_swb; g++) { 
746 
const float *scaled = s>scoefs + start; 
747 
maxvals[w*16+g] = find_max_val(sce>ics.group_len[w], sce>ics.swb_sizes[g], scaled);

748 
start += sce>ics.swb_sizes[g]; 
749 
} 
750 
} 
751  
752 
//perform twoloop search

753 
//outer loop  improve quality

754 
do {

755 
int tbits, qstep;

756 
minscaler = sce>sf_idx[0];

757 
//inner loop  quantize spectrum to fit into given number of bits

758 
qstep = its ? 1 : 32; 
759 
do {

760 
int prev = 1; 
761 
tbits = 0;

762 
fflag = 0;

763 
for (w = 0; w < sce>ics.num_windows; w += sce>ics.group_len[w]) { 
764 
start = w*128;

765 
for (g = 0; g < sce>ics.num_swb; g++) { 
766 
const float *coefs = sce>coeffs + start; 
767 
const float *scaled = s>scoefs + start; 
768 
int bits = 0; 
769 
int cb;

770 
float dist = 0.0f; 
771  
772 
if (sce>zeroes[w*16+g]  sce>sf_idx[w*16+g] >= 218) { 
773 
start += sce>ics.swb_sizes[g]; 
774 
continue;

775 
} 
776 
minscaler = FFMIN(minscaler, sce>sf_idx[w*16+g]);

777 
cb = find_min_book(maxvals[w*16+g], sce>sf_idx[w*16+g]); 
778 
for (w2 = 0; w2 < sce>ics.group_len[w]; w2++) { 
779 
int b;

780 
dist += quantize_band_cost(s, coefs + w2*128,

781 
scaled + w2*128,

782 
sce>ics.swb_sizes[g], 
783 
sce>sf_idx[w*16+g],

784 
cb, 
785 
1.0f, 
786 
INFINITY, 
787 
&b); 
788 
bits += b; 
789 
} 
790 
dists[w*16+g] = dist  bits;

791 
if (prev != 1) { 
792 
bits += ff_aac_scalefactor_bits[sce>sf_idx[w*16+g]  prev + SCALE_DIFF_ZERO];

793 
} 
794 
tbits += bits; 
795 
start += sce>ics.swb_sizes[g]; 
796 
prev = sce>sf_idx[w*16+g];

797 
} 
798 
} 
799 
if (tbits > destbits) {

800 
for (i = 0; i < 128; i++) 
801 
if (sce>sf_idx[i] < 218  qstep) 
802 
sce>sf_idx[i] += qstep; 
803 
} else {

804 
for (i = 0; i < 128; i++) 
805 
if (sce>sf_idx[i] > 60  qstep) 
806 
sce>sf_idx[i] = qstep; 
807 
} 
808 
qstep >>= 1;

809 
if (!qstep && tbits > destbits*1.02 && sce>sf_idx[0] < 217) 
810 
qstep = 1;

811 
} while (qstep);

812  
813 
fflag = 0;

814 
minscaler = av_clip(minscaler, 60, 255  SCALE_MAX_DIFF); 
815 
for (w = 0; w < sce>ics.num_windows; w += sce>ics.group_len[w]) { 
816 
for (g = 0; g < sce>ics.num_swb; g++) { 
817 
int prevsc = sce>sf_idx[w*16+g]; 
818 
if (dists[w*16+g] > uplims[w*16+g] && sce>sf_idx[w*16+g] > 60) { 
819 
if (find_min_book(maxvals[w*16+g], sce>sf_idx[w*16+g]1)) 
820 
sce>sf_idx[w*16+g];

821 
else //Try to make sure there is some energy in every band 
822 
sce>sf_idx[w*16+g]=2; 
823 
} 
824 
sce>sf_idx[w*16+g] = av_clip(sce>sf_idx[w*16+g], minscaler, minscaler + SCALE_MAX_DIFF); 
825 
sce>sf_idx[w*16+g] = FFMIN(sce>sf_idx[w*16+g], 219); 
826 
if (sce>sf_idx[w*16+g] != prevsc) 
827 
fflag = 1;

828 
sce>band_type[w*16+g] = find_min_book(maxvals[w*16+g], sce>sf_idx[w*16+g]); 
829 
} 
830 
} 
831 
its++; 
832 
} while (fflag && its < 10); 
833 
} 
834  
835 
static void search_for_quantizers_faac(AVCodecContext *avctx, AACEncContext *s, 
836 
SingleChannelElement *sce, 
837 
const float lambda) 
838 
{ 
839 
int start = 0, i, w, w2, g; 
840 
float uplim[128], maxq[128]; 
841 
int minq, maxsf;

842 
float distfact = ((sce>ics.num_windows > 1) ? 85.80 : 147.84) / lambda; 
843 
int last = 0, lastband = 0, curband = 0; 
844 
float avg_energy = 0.0; 
845 
if (sce>ics.num_windows == 1) { 
846 
start = 0;

847 
for (i = 0; i < 1024; i++) { 
848 
if (i  start >= sce>ics.swb_sizes[curband]) {

849 
start += sce>ics.swb_sizes[curband]; 
850 
curband++; 
851 
} 
852 
if (sce>coeffs[i]) {

853 
avg_energy += sce>coeffs[i] * sce>coeffs[i]; 
854 
last = i; 
855 
lastband = curband; 
856 
} 
857 
} 
858 
} else {

859 
for (w = 0; w < 8; w++) { 
860 
const float *coeffs = sce>coeffs + w*128; 
861 
start = 0;

862 
for (i = 0; i < 128; i++) { 
863 
if (i  start >= sce>ics.swb_sizes[curband]) {

864 
start += sce>ics.swb_sizes[curband]; 
865 
curband++; 
866 
} 
867 
if (coeffs[i]) {

868 
avg_energy += coeffs[i] * coeffs[i]; 
869 
last = FFMAX(last, i); 
870 
lastband = FFMAX(lastband, curband); 
871 
} 
872 
} 
873 
} 
874 
} 
875 
last++; 
876 
avg_energy /= last; 
877 
if (avg_energy == 0.0f) { 
878 
for (i = 0; i < FF_ARRAY_ELEMS(sce>sf_idx); i++) 
879 
sce>sf_idx[i] = SCALE_ONE_POS; 
880 
return;

881 
} 
882 
for (w = 0; w < sce>ics.num_windows; w += sce>ics.group_len[w]) { 
883 
start = w*128;

884 
for (g = 0; g < sce>ics.num_swb; g++) { 
885 
float *coefs = sce>coeffs + start;

886 
const int size = sce>ics.swb_sizes[g]; 
887 
int start2 = start, end2 = start + size, peakpos = start;

888 
float maxval = 1, thr = 0.0f, t; 
889 
maxq[w*16+g] = 0.0f; 
890 
if (g > lastband) {

891 
maxq[w*16+g] = 0.0f; 
892 
start += size; 
893 
for (w2 = 0; w2 < sce>ics.group_len[w]; w2++) 
894 
memset(coefs + w2*128, 0, sizeof(coefs[0])*size); 
895 
continue;

896 
} 
897 
for (w2 = 0; w2 < sce>ics.group_len[w]; w2++) { 
898 
for (i = 0; i < size; i++) { 
899 
float t = coefs[w2*128+i]*coefs[w2*128+i]; 
900 
maxq[w*16+g] = FFMAX(maxq[w*16+g], fabsf(coefs[w2*128 + i])); 
901 
thr += t; 
902 
if (sce>ics.num_windows == 1 && maxval < t) { 
903 
maxval = t; 
904 
peakpos = start+i; 
905 
} 
906 
} 
907 
} 
908 
if (sce>ics.num_windows == 1) { 
909 
start2 = FFMAX(peakpos  2, start2);

910 
end2 = FFMIN(peakpos + 3, end2);

911 
} else {

912 
start2 = start; 
913 
end2 = start; 
914 
} 
915 
start += size; 
916 
thr = pow(thr / (avg_energy * (end2  start2)), 0.3 + 0.1*(lastband  g) / lastband); 
917 
t = 1.0  (1.0 * start2 / last); 
918 
uplim[w*16+g] = distfact / (1.4 * thr + t*t*t + 0.075); 
919 
} 
920 
} 
921 
memset(sce>sf_idx, 0, sizeof(sce>sf_idx)); 
922 
abs_pow34_v(s>scoefs, sce>coeffs, 1024);

923 
for (w = 0; w < sce>ics.num_windows; w += sce>ics.group_len[w]) { 
924 
start = w*128;

925 
for (g = 0; g < sce>ics.num_swb; g++) { 
926 
const float *coefs = sce>coeffs + start; 
927 
const float *scaled = s>scoefs + start; 
928 
const int size = sce>ics.swb_sizes[g]; 
929 
int scf, prev_scf, step;

930 
int min_scf = 1, max_scf = 256; 
931 
float curdiff;

932 
if (maxq[w*16+g] < 21.544) { 
933 
sce>zeroes[w*16+g] = 1; 
934 
start += size; 
935 
continue;

936 
} 
937 
sce>zeroes[w*16+g] = 0; 
938 
scf = prev_scf = av_clip(SCALE_ONE_POS  SCALE_DIV_512  log2f(1/maxq[w*16+g])*16/3, 60, 218); 
939 
step = 16;

940 
for (;;) {

941 
float dist = 0.0f; 
942 
int quant_max;

943  
944 
for (w2 = 0; w2 < sce>ics.group_len[w]; w2++) { 
945 
int b;

946 
dist += quantize_band_cost(s, coefs + w2*128,

947 
scaled + w2*128,

948 
sce>ics.swb_sizes[g], 
949 
scf, 
950 
ESC_BT, 
951 
lambda, 
952 
INFINITY, 
953 
&b); 
954 
dist = b; 
955 
} 
956 
dist *= 1.0f / 512.0f / lambda; 
957 
quant_max = quant(maxq[w*16+g], ff_aac_pow2sf_tab[200  scf + SCALE_ONE_POS  SCALE_DIV_512]); 
958 
if (quant_max >= 8191) { // too much, return to the previous quantizer 
959 
sce>sf_idx[w*16+g] = prev_scf;

960 
break;

961 
} 
962 
prev_scf = scf; 
963 
curdiff = fabsf(dist  uplim[w*16+g]);

964 
if (curdiff <= 1.0f) 
965 
step = 0;

966 
else

967 
step = log2f(curdiff); 
968 
if (dist > uplim[w*16+g]) 
969 
step = step; 
970 
scf += step; 
971 
scf = av_clip_uint8(scf); 
972 
step = scf  prev_scf; 
973 
if (FFABS(step) <= 1  (step > 0 && scf >= max_scf)  (step < 0 && scf <= min_scf)) { 
974 
sce>sf_idx[w*16+g] = av_clip(scf, min_scf, max_scf);

975 
break;

976 
} 
977 
if (step > 0) 
978 
min_scf = prev_scf; 
979 
else

980 
max_scf = prev_scf; 
981 
} 
982 
start += size; 
983 
} 
984 
} 
985 
minq = sce>sf_idx[0] ? sce>sf_idx[0] : INT_MAX; 
986 
for (i = 1; i < 128; i++) { 
987 
if (!sce>sf_idx[i])

988 
sce>sf_idx[i] = sce>sf_idx[i1];

989 
else

990 
minq = FFMIN(minq, sce>sf_idx[i]); 
991 
} 
992 
if (minq == INT_MAX)

993 
minq = 0;

994 
minq = FFMIN(minq, SCALE_MAX_POS); 
995 
maxsf = FFMIN(minq + SCALE_MAX_DIFF, SCALE_MAX_POS); 
996 
for (i = 126; i >= 0; i) { 
997 
if (!sce>sf_idx[i])

998 
sce>sf_idx[i] = sce>sf_idx[i+1];

999 
sce>sf_idx[i] = av_clip(sce>sf_idx[i], minq, maxsf); 
1000 
} 
1001 
} 
1002  
1003 
static void search_for_quantizers_fast(AVCodecContext *avctx, AACEncContext *s, 
1004 
SingleChannelElement *sce, 
1005 
const float lambda) 
1006 
{ 
1007 
int start = 0, i, w, w2, g; 
1008 
int minq = 255; 
1009  
1010 
memset(sce>sf_idx, 0, sizeof(sce>sf_idx)); 
1011 
for (w = 0; w < sce>ics.num_windows; w += sce>ics.group_len[w]) { 
1012 
start = w*128;

1013 
for (g = 0; g < sce>ics.num_swb; g++) { 
1014 
for (w2 = 0; w2 < sce>ics.group_len[w]; w2++) { 
1015 
FFPsyBand *band = &s>psy.psy_bands[s>cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];

1016 
if (band>energy <= band>threshold) {

1017 
sce>sf_idx[(w+w2)*16+g] = 218; 
1018 
sce>zeroes[(w+w2)*16+g] = 1; 
1019 
} else {

1020 
sce>sf_idx[(w+w2)*16+g] = av_clip(SCALE_ONE_POS  SCALE_DIV_512 + log2f(band>threshold), 80, 218); 
1021 
sce>zeroes[(w+w2)*16+g] = 0; 
1022 
} 
1023 
minq = FFMIN(minq, sce>sf_idx[(w+w2)*16+g]);

1024 
} 
1025 
} 
1026 
} 
1027 
for (i = 0; i < 128; i++) { 
1028 
sce>sf_idx[i] = 140;

1029 
//av_clip(sce>sf_idx[i], minq, minq + SCALE_MAX_DIFF  1);

1030 
} 
1031 
//set the same quantizers inside window groups

1032 
for (w = 0; w < sce>ics.num_windows; w += sce>ics.group_len[w]) 
1033 
for (g = 0; g < sce>ics.num_swb; g++) 
1034 
for (w2 = 1; w2 < sce>ics.group_len[w]; w2++) 
1035 
sce>sf_idx[(w+w2)*16+g] = sce>sf_idx[w*16+g]; 
1036 
} 
1037  
1038 
static void search_for_ms(AACEncContext *s, ChannelElement *cpe, 
1039 
const float lambda) 
1040 
{ 
1041 
int start = 0, i, w, w2, g; 
1042 
float M[128], S[128]; 
1043 
float *L34 = s>scoefs, *R34 = s>scoefs + 128, *M34 = s>scoefs + 128*2, *S34 = s>scoefs + 128*3; 
1044 
SingleChannelElement *sce0 = &cpe>ch[0];

1045 
SingleChannelElement *sce1 = &cpe>ch[1];

1046 
if (!cpe>common_window)

1047 
return;

1048 
for (w = 0; w < sce0>ics.num_windows; w += sce0>ics.group_len[w]) { 
1049 
for (g = 0; g < sce0>ics.num_swb; g++) { 
1050 
if (!cpe>ch[0].zeroes[w*16+g] && !cpe>ch[1].zeroes[w*16+g]) { 
1051 
float dist1 = 0.0f, dist2 = 0.0f; 
1052 
for (w2 = 0; w2 < sce0>ics.group_len[w]; w2++) { 
1053 
FFPsyBand *band0 = &s>psy.psy_bands[(s>cur_channel+0)*PSY_MAX_BANDS+(w+w2)*16+g]; 
1054 
FFPsyBand *band1 = &s>psy.psy_bands[(s>cur_channel+1)*PSY_MAX_BANDS+(w+w2)*16+g]; 
1055 
float minthr = FFMIN(band0>threshold, band1>threshold);

1056 
float maxthr = FFMAX(band0>threshold, band1>threshold);

1057 
for (i = 0; i < sce0>ics.swb_sizes[g]; i++) { 
1058 
M[i] = (sce0>coeffs[start+w2*128+i]

1059 
+ sce1>coeffs[start+w2*128+i]) * 0.5; 
1060 
S[i] = M[i] 
1061 
 sce1>coeffs[start+w2*128+i];

1062 
} 
1063 
abs_pow34_v(L34, sce0>coeffs+start+w2*128, sce0>ics.swb_sizes[g]);

1064 
abs_pow34_v(R34, sce1>coeffs+start+w2*128, sce0>ics.swb_sizes[g]);

1065 
abs_pow34_v(M34, M, sce0>ics.swb_sizes[g]); 
1066 
abs_pow34_v(S34, S, sce0>ics.swb_sizes[g]); 
1067 
dist1 += quantize_band_cost(s, sce0>coeffs + start + w2*128,

1068 
L34, 
1069 
sce0>ics.swb_sizes[g], 
1070 
sce0>sf_idx[(w+w2)*16+g],

1071 
sce0>band_type[(w+w2)*16+g],

1072 
lambda / band0>threshold, INFINITY, NULL);

1073 
dist1 += quantize_band_cost(s, sce1>coeffs + start + w2*128,

1074 
R34, 
1075 
sce1>ics.swb_sizes[g], 
1076 
sce1>sf_idx[(w+w2)*16+g],

1077 
sce1>band_type[(w+w2)*16+g],

1078 
lambda / band1>threshold, INFINITY, NULL);

1079 
dist2 += quantize_band_cost(s, M, 
1080 
M34, 
1081 
sce0>ics.swb_sizes[g], 
1082 
sce0>sf_idx[(w+w2)*16+g],

1083 
sce0>band_type[(w+w2)*16+g],

1084 
lambda / maxthr, INFINITY, NULL);

1085 
dist2 += quantize_band_cost(s, S, 
1086 
S34, 
1087 
sce1>ics.swb_sizes[g], 
1088 
sce1>sf_idx[(w+w2)*16+g],

1089 
sce1>band_type[(w+w2)*16+g],

1090 
lambda / minthr, INFINITY, NULL);

1091 
} 
1092 
cpe>ms_mask[w*16+g] = dist2 < dist1;

1093 
} 
1094 
start += sce0>ics.swb_sizes[g]; 
1095 
} 
1096 
} 
1097 
} 
1098  
1099 
AACCoefficientsEncoder ff_aac_coders[] = { 
1100 
{ 
1101 
search_for_quantizers_faac, 
1102 
encode_window_bands_info, 
1103 
quantize_and_encode_band, 
1104 
search_for_ms, 
1105 
}, 
1106 
{ 
1107 
search_for_quantizers_anmr, 
1108 
encode_window_bands_info, 
1109 
quantize_and_encode_band, 
1110 
search_for_ms, 
1111 
}, 
1112 
{ 
1113 
search_for_quantizers_twoloop, 
1114 
codebook_trellis_rate, 
1115 
quantize_and_encode_band, 
1116 
search_for_ms, 
1117 
}, 
1118 
{ 
1119 
search_for_quantizers_fast, 
1120 
encode_window_bands_info, 
1121 
quantize_and_encode_band, 
1122 
search_for_ms, 
1123 
}, 
1124 
}; 