2 * AAC coefficients encoder
3 * Copyright (C) 2008-2009 Konstantin Shishkov
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * @file libavcodec/aaccoder.c
24 * AAC coefficients encoder
27 /***********************************
29 * speedup quantizer selection
30 * add sane pulse detection
31 ***********************************/
39 /** bits needed to code codebook run value for long windows */
40 static const uint8_t run_value_bits_long[64] = {
41 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
42 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 10,
43 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
44 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 15
47 /** bits needed to code codebook run value for short windows */
48 static const uint8_t run_value_bits_short[16] = {
49 3, 3, 3, 3, 3, 3, 3, 6, 6, 6, 6, 6, 6, 6, 6, 9
52 static const uint8_t *run_value_bits[2] = {
53 run_value_bits_long, run_value_bits_short
58 * Quantize one coefficient.
59 * @return absolute value of the quantized coefficient
60 * @see 3GPP TS26.403 5.6.2 "Scalefactor determination"
62 static av_always_inline int quant(float coef, const float Q)
65 return sqrtf(a * sqrtf(a)) + 0.4054;
68 static void quantize_bands(int (*out)[2], const float *in, const float *scaled,
69 int size, float Q34, int is_signed, int maxval)
73 for (i = 0; i < size; i++) {
75 out[i][0] = (int)FFMIN(qc, (double)maxval);
76 out[i][1] = (int)FFMIN(qc + 0.4054, (double)maxval);
77 if (is_signed && in[i] < 0.0f) {
78 out[i][0] = -out[i][0];
79 out[i][1] = -out[i][1];
84 static void abs_pow34_v(float *out, const float *in, const int size)
86 #ifndef USE_REALLY_FULL_SEARCH
88 for (i = 0; i < size; i++) {
89 float a = fabsf(in[i]);
90 out[i] = sqrtf(a * sqrtf(a));
92 #endif /* USE_REALLY_FULL_SEARCH */
95 static const uint8_t aac_cb_range [12] = {0, 3, 3, 3, 3, 9, 9, 8, 8, 13, 13, 17};
96 static const uint8_t aac_cb_maxval[12] = {0, 1, 1, 2, 2, 4, 4, 7, 7, 12, 12, 16};
99 * Calculate rate distortion cost for quantizing with given codebook
101 * @return quantization distortion
103 static float quantize_and_encode_band_cost(struct AACEncContext *s,
104 PutBitContext *pb, const float *in,
105 const float *scaled, int size, int scale_idx,
106 int cb, const float lambda, const float uplim,
109 const float IQ = ff_aac_pow2sf_tab[200 + scale_idx - SCALE_ONE_POS + SCALE_DIV_512];
110 const float Q = ff_aac_pow2sf_tab[200 - scale_idx + SCALE_ONE_POS - SCALE_DIV_512];
111 const float CLIPPED_ESCAPE = 165140.0f*IQ;
114 const int dim = cb < FIRST_PAIR_BT ? 4 : 2;
116 #ifndef USE_REALLY_FULL_SEARCH
117 const float Q34 = sqrtf(Q * sqrtf(Q));
118 const int range = aac_cb_range[cb];
119 const int maxval = aac_cb_maxval[cb];
121 #endif /* USE_REALLY_FULL_SEARCH */
124 for (i = 0; i < size; i++)
128 return cost * lambda;
130 #ifndef USE_REALLY_FULL_SEARCH
132 for (i = 1; i < dim; i++)
133 offs[i] = offs[i-1]*range;
135 abs_pow34_v(s->scoefs, in, size);
138 quantize_bands(s->qcoefs, in, scaled, size, Q34, !IS_CODEBOOK_UNSIGNED(cb), maxval);
139 #endif /* USE_REALLY_FULL_SEARCH */
140 for (i = 0; i < size; i += dim) {
145 #ifndef USE_REALLY_FULL_SEARCH
146 int (*quants)[2] = &s->qcoefs[i];
148 for (j = 0; j < dim; j++)
149 mincost += in[i+j]*in[i+j];
150 minidx = IS_CODEBOOK_UNSIGNED(cb) ? 0 : 40;
151 minbits = ff_aac_spectral_bits[cb-1][minidx];
152 mincost = mincost * lambda + minbits;
153 for (j = 0; j < (1<<dim); j++) {
156 int curidx = IS_CODEBOOK_UNSIGNED(cb) ? 0 : 40;
158 for (k = 0; k < dim; k++) {
159 if ((j & (1 << k)) && quants[k][0] == quants[k][1]) {
166 for (k = 0; k < dim; k++)
167 curidx += quants[k][!!(j & (1 << k))] * offs[dim - 1 - k];
168 curbits = ff_aac_spectral_bits[cb-1][curidx];
169 vec = &ff_aac_codebook_vectors[cb-1][curidx*dim];
172 vec = ff_aac_codebook_vectors[cb-1];
173 for (j = 0; j < ff_aac_spectral_sizes[cb-1]; j++, vec += dim) {
175 int curbits = ff_aac_spectral_bits[cb-1][j];
177 #endif /* USE_REALLY_FULL_SEARCH */
178 if (IS_CODEBOOK_UNSIGNED(cb)) {
179 for (k = 0; k < dim; k++) {
180 float t = fabsf(in[i+k]);
182 if (vec[k] == 64.0f) { //FIXME: slow
183 //do not code with escape sequence small values
188 if (t >= CLIPPED_ESCAPE) {
189 di = t - CLIPPED_ESCAPE;
192 int c = av_clip(quant(t, Q), 0, 8191);
193 di = t - c*cbrtf(c)*IQ;
194 curbits += av_log2(c)*2 - 4 + 1;
204 for (k = 0; k < dim; k++) {
205 float di = in[i+k] - vec[k]*IQ;
209 rd = rd * lambda + curbits;
221 put_bits(pb, ff_aac_spectral_bits[cb-1][minidx], ff_aac_spectral_codes[cb-1][minidx]);
222 if (IS_CODEBOOK_UNSIGNED(cb))
223 for (j = 0; j < dim; j++)
224 if (ff_aac_codebook_vectors[cb-1][minidx*dim+j] != 0.0f)
225 put_bits(pb, 1, in[i+j] < 0.0f);
227 for (j = 0; j < 2; j++) {
228 if (ff_aac_codebook_vectors[cb-1][minidx*2+j] == 64.0f) {
229 int coef = av_clip(quant(fabsf(in[i+j]), Q), 0, 8191);
230 int len = av_log2(coef);
232 put_bits(pb, len - 4 + 1, (1 << (len - 4 + 1)) - 2);
233 put_bits(pb, len, coef & ((1 << len) - 1));
244 static float quantize_band_cost(struct AACEncContext *s, const float *in,
245 const float *scaled, int size, int scale_idx,
246 int cb, const float lambda, const float uplim,
249 return quantize_and_encode_band_cost(s, NULL, in, scaled, size, scale_idx,
250 cb, lambda, uplim, bits);
253 static void quantize_and_encode_band(struct AACEncContext *s, PutBitContext *pb,
254 const float *in, int size, int scale_idx,
255 int cb, const float lambda)
257 quantize_and_encode_band_cost(s, pb, in, NULL, size, scale_idx, cb, lambda,
262 * structure used in optimal codebook search
264 typedef struct BandCodingPath {
265 int prev_idx; ///< pointer to the previous path point
266 float cost; ///< path cost
271 * Encode band info for single window group bands.
273 static void encode_window_bands_info(AACEncContext *s, SingleChannelElement *sce,
274 int win, int group_len, const float lambda)
276 BandCodingPath path[120][12];
277 int w, swb, cb, start, start2, size;
279 const int max_sfb = sce->ics.max_sfb;
280 const int run_bits = sce->ics.num_windows == 1 ? 5 : 3;
281 const int run_esc = (1 << run_bits) - 1;
282 int idx, ppos, count;
283 int stackrun[120], stackcb[120], stack_len;
284 float next_minrd = INFINITY;
287 abs_pow34_v(s->scoefs, sce->coeffs, 1024);
289 for (cb = 0; cb < 12; cb++) {
290 path[0][cb].cost = 0.0f;
291 path[0][cb].prev_idx = -1;
294 for (swb = 0; swb < max_sfb; swb++) {
296 size = sce->ics.swb_sizes[swb];
297 if (sce->zeroes[win*16 + swb]) {
298 for (cb = 0; cb < 12; cb++) {
299 path[swb+1][cb].prev_idx = cb;
300 path[swb+1][cb].cost = path[swb][cb].cost;
301 path[swb+1][cb].run = path[swb][cb].run + 1;
304 float minrd = next_minrd;
305 int mincb = next_mincb;
306 next_minrd = INFINITY;
308 for (cb = 0; cb < 12; cb++) {
309 float cost_stay_here, cost_get_here;
311 for (w = 0; w < group_len; w++) {
312 FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(win+w)*16+swb];
313 rd += quantize_band_cost(s, sce->coeffs + start + w*128,
314 s->scoefs + start + w*128, size,
315 sce->sf_idx[(win+w)*16+swb], cb,
316 lambda / band->threshold, INFINITY, NULL);
318 cost_stay_here = path[swb][cb].cost + rd;
319 cost_get_here = minrd + rd + run_bits + 4;
320 if ( run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run]
321 != run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run+1])
322 cost_stay_here += run_bits;
323 if (cost_get_here < cost_stay_here) {
324 path[swb+1][cb].prev_idx = mincb;
325 path[swb+1][cb].cost = cost_get_here;
326 path[swb+1][cb].run = 1;
328 path[swb+1][cb].prev_idx = cb;
329 path[swb+1][cb].cost = cost_stay_here;
330 path[swb+1][cb].run = path[swb][cb].run + 1;
332 if (path[swb+1][cb].cost < next_minrd) {
333 next_minrd = path[swb+1][cb].cost;
338 start += sce->ics.swb_sizes[swb];
341 //convert resulting path from backward-linked list
344 for (cb = 1; cb < 12; cb++)
345 if (path[max_sfb][cb].cost < path[max_sfb][idx].cost)
350 stackrun[stack_len] = path[ppos][cb].run;
351 stackcb [stack_len] = cb;
352 idx = path[ppos-path[ppos][cb].run+1][cb].prev_idx;
353 ppos -= path[ppos][cb].run;
356 //perform actual band info encoding
358 for (i = stack_len - 1; i >= 0; i--) {
359 put_bits(&s->pb, 4, stackcb[i]);
361 memset(sce->zeroes + win*16 + start, !stackcb[i], count);
362 //XXX: memset when band_type is also uint8_t
363 for (j = 0; j < count; j++) {
364 sce->band_type[win*16 + start] = stackcb[i];
367 while (count >= run_esc) {
368 put_bits(&s->pb, run_bits, run_esc);
371 put_bits(&s->pb, run_bits, count);
375 typedef struct TrellisPath {
382 #define TRELLIS_STAGES 121
383 #define TRELLIS_STATES 256
385 static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s,
386 SingleChannelElement *sce,
389 int q, w, w2, g, start = 0;
392 TrellisPath paths[TRELLIS_STAGES][TRELLIS_STATES];
393 int bandaddr[TRELLIS_STAGES];
397 for (i = 0; i < TRELLIS_STATES; i++) {
398 paths[0][i].cost = 0.0f;
399 paths[0][i].prev = -1;
400 paths[0][i].min_val = i;
401 paths[0][i].max_val = i;
403 for (j = 1; j < TRELLIS_STAGES; j++) {
404 for (i = 0; i < TRELLIS_STATES; i++) {
405 paths[j][i].cost = INFINITY;
406 paths[j][i].prev = -2;
407 paths[j][i].min_val = INT_MAX;
408 paths[j][i].max_val = 0;
412 abs_pow34_v(s->scoefs, sce->coeffs, 1024);
413 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
415 for (g = 0; g < sce->ics.num_swb; g++) {
416 const float *coefs = sce->coeffs + start;
420 bandaddr[idx] = w * 16 + g;
423 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
424 FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
425 if (band->energy <= band->threshold || band->threshold == 0.0f) {
426 sce->zeroes[(w+w2)*16+g] = 1;
429 sce->zeroes[(w+w2)*16+g] = 0;
431 for (i = 0; i < sce->ics.swb_sizes[g]; i++) {
432 float t = fabsf(coefs[w2*128+i]);
434 qmin = FFMIN(qmin, t);
435 qmax = FFMAX(qmax, t);
439 int minscale, maxscale;
440 float minrd = INFINITY;
441 //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
442 minscale = av_clip_uint8(log2(qmin)*4 - 69 + SCALE_ONE_POS - SCALE_DIV_512);
443 //maximum scalefactor index is when maximum coefficient after quantizing is still not zero
444 maxscale = av_clip_uint8(log2(qmax)*4 + 6 + SCALE_ONE_POS - SCALE_DIV_512);
445 for (q = minscale; q < maxscale; q++) {
446 float dists[12], dist;
447 memset(dists, 0, sizeof(dists));
448 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
449 FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
451 for (cb = 0; cb <= ESC_BT; cb++)
452 dists[cb] += quantize_band_cost(s, coefs + w2*128, s->scoefs + start + w2*128, sce->ics.swb_sizes[g],
453 q, cb, lambda / band->threshold, INFINITY, NULL);
456 for (i = 1; i <= ESC_BT; i++)
457 dist = FFMIN(dist, dists[i]);
458 minrd = FFMIN(minrd, dist);
460 for (i = FFMAX(q - SCALE_MAX_DIFF, 0); i < FFMIN(q + SCALE_MAX_DIFF, TRELLIS_STATES); i++) {
463 if (isinf(paths[idx - 1][i].cost))
465 cost = paths[idx - 1][i].cost + dist
466 + ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO];
467 minv = FFMIN(paths[idx - 1][i].min_val, q);
468 maxv = FFMAX(paths[idx - 1][i].max_val, q);
469 if (cost < paths[idx][q].cost && maxv-minv < SCALE_MAX_DIFF) {
470 paths[idx][q].cost = cost;
471 paths[idx][q].prev = i;
472 paths[idx][q].min_val = minv;
473 paths[idx][q].max_val = maxv;
478 for (q = 0; q < TRELLIS_STATES; q++) {
479 if (!isinf(paths[idx - 1][q].cost)) {
480 paths[idx][q].cost = paths[idx - 1][q].cost + 1;
481 paths[idx][q].prev = q;
482 paths[idx][q].min_val = FFMIN(paths[idx - 1][q].min_val, q);
483 paths[idx][q].max_val = FFMAX(paths[idx - 1][q].max_val, q);
486 for (i = FFMAX(q - SCALE_MAX_DIFF, 0); i < FFMIN(q + SCALE_MAX_DIFF, TRELLIS_STATES); i++) {
489 if (isinf(paths[idx - 1][i].cost))
491 cost = paths[idx - 1][i].cost + ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO];
492 minv = FFMIN(paths[idx - 1][i].min_val, q);
493 maxv = FFMAX(paths[idx - 1][i].max_val, q);
494 if (cost < paths[idx][q].cost && maxv-minv < SCALE_MAX_DIFF) {
495 paths[idx][q].cost = cost;
496 paths[idx][q].prev = i;
497 paths[idx][q].min_val = minv;
498 paths[idx][q].max_val = maxv;
503 sce->zeroes[w*16+g] = !nz;
504 start += sce->ics.swb_sizes[g];
509 mincost = paths[idx][0].cost;
511 for (i = 1; i < TRELLIS_STATES; i++) {
512 if (paths[idx][i].cost < mincost) {
513 mincost = paths[idx][i].cost;
518 sce->sf_idx[bandaddr[idx]] = minq;
519 minq = paths[idx][minq].prev;
522 //set the same quantizers inside window groups
523 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
524 for (g = 0; g < sce->ics.num_swb; g++)
525 for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
526 sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
530 * two-loop quantizers search taken from ISO 13818-7 Appendix C
532 static void search_for_quantizers_twoloop(AVCodecContext *avctx,
534 SingleChannelElement *sce,
537 int start = 0, i, w, w2, g;
538 int destbits = avctx->bit_rate * 1024.0 / avctx->sample_rate / avctx->channels;
539 float dists[128], uplims[128];
540 int fflag, minscaler;
543 float minthr = INFINITY;
545 //XXX: some heuristic to determine initial quantizers will reduce search time
546 memset(dists, 0, sizeof(dists));
547 //determine zero bands and upper limits
548 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
549 for (g = 0; g < sce->ics.num_swb; g++) {
552 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
553 FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
554 uplim += band->threshold;
555 if (band->energy <= band->threshold || band->threshold == 0.0f) {
556 sce->zeroes[(w+w2)*16+g] = 1;
561 uplims[w*16+g] = uplim *512;
562 sce->zeroes[w*16+g] = !nz;
564 minthr = FFMIN(minthr, uplim);
565 allz = FFMAX(allz, nz);
568 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
569 for (g = 0; g < sce->ics.num_swb; g++) {
570 if (sce->zeroes[w*16+g]) {
571 sce->sf_idx[w*16+g] = SCALE_ONE_POS;
574 sce->sf_idx[w*16+g] = SCALE_ONE_POS + FFMIN(log2(uplims[w*16+g]/minthr)*4,59);
580 abs_pow34_v(s->scoefs, sce->coeffs, 1024);
581 //perform two-loop search
582 //outer loop - improve quality
585 minscaler = sce->sf_idx[0];
586 //inner loop - quantize spectrum to fit into given number of bits
587 qstep = its ? 1 : 32;
592 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
594 for (g = 0; g < sce->ics.num_swb; g++) {
595 const float *coefs = sce->coeffs + start;
596 const float *scaled = s->scoefs + start;
599 float mindist = INFINITY;
602 if (sce->zeroes[w*16+g] || sce->sf_idx[w*16+g] >= 218) {
603 start += sce->ics.swb_sizes[g];
606 minscaler = FFMIN(minscaler, sce->sf_idx[w*16+g]);
607 for (cb = 0; cb <= ESC_BT; cb++) {
610 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
612 dist += quantize_band_cost(s, coefs + w2*128,
614 sce->ics.swb_sizes[g],
622 if (dist < mindist) {
627 dists[w*16+g] = (mindist - minbits) / lambda;
630 bits += ff_aac_scalefactor_bits[sce->sf_idx[w*16+g] - prev + SCALE_DIFF_ZERO];
633 start += sce->ics.swb_sizes[g];
634 prev = sce->sf_idx[w*16+g];
637 if (tbits > destbits) {
638 for (i = 0; i < 128; i++)
639 if (sce->sf_idx[i] < 218 - qstep)
640 sce->sf_idx[i] += qstep;
642 for (i = 0; i < 128; i++)
643 if (sce->sf_idx[i] > 60 - qstep)
644 sce->sf_idx[i] -= qstep;
647 if (!qstep && tbits > destbits*1.02)
649 if (sce->sf_idx[0] >= 217)
654 minscaler = av_clip(minscaler, 60, 255 - SCALE_MAX_DIFF);
655 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
657 for (g = 0; g < sce->ics.num_swb; g++) {
658 int prevsc = sce->sf_idx[w*16+g];
659 if (dists[w*16+g] > uplims[w*16+g] && sce->sf_idx[w*16+g] > 60)
660 sce->sf_idx[w*16+g]--;
661 sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler, minscaler + SCALE_MAX_DIFF);
662 sce->sf_idx[w*16+g] = FFMIN(sce->sf_idx[w*16+g], 219);
663 if (sce->sf_idx[w*16+g] != prevsc)
668 } while (fflag && its < 10);
671 static void search_for_quantizers_faac(AVCodecContext *avctx, AACEncContext *s,
672 SingleChannelElement *sce,
675 int start = 0, i, w, w2, g;
676 float uplim[128], maxq[128];
678 float distfact = ((sce->ics.num_windows > 1) ? 85.80 : 147.84) / lambda;
679 int last = 0, lastband = 0, curband = 0;
680 float avg_energy = 0.0;
681 if (sce->ics.num_windows == 1) {
683 for (i = 0; i < 1024; i++) {
684 if (i - start >= sce->ics.swb_sizes[curband]) {
685 start += sce->ics.swb_sizes[curband];
688 if (sce->coeffs[i]) {
689 avg_energy += sce->coeffs[i] * sce->coeffs[i];
695 for (w = 0; w < 8; w++) {
696 const float *coeffs = sce->coeffs + w*128;
698 for (i = 0; i < 128; i++) {
699 if (i - start >= sce->ics.swb_sizes[curband]) {
700 start += sce->ics.swb_sizes[curband];
704 avg_energy += coeffs[i] * coeffs[i];
705 last = FFMAX(last, i);
706 lastband = FFMAX(lastband, curband);
713 if (avg_energy == 0.0f) {
714 for (i = 0; i < FF_ARRAY_ELEMS(sce->sf_idx); i++)
715 sce->sf_idx[i] = SCALE_ONE_POS;
718 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
720 for (g = 0; g < sce->ics.num_swb; g++) {
721 float *coefs = sce->coeffs + start;
722 const int size = sce->ics.swb_sizes[g];
723 int start2 = start, end2 = start + size, peakpos = start;
724 float maxval = -1, thr = 0.0f, t;
729 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++)
730 memset(coefs + w2*128, 0, sizeof(coefs[0])*size);
733 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
734 for (i = 0; i < size; i++) {
735 float t = coefs[w2*128+i]*coefs[w2*128+i];
736 maxq[w*16+g] = FFMAX(maxq[w*16+g], fabsf(coefs[w2*128 + i]));
738 if (sce->ics.num_windows == 1 && maxval < t) {
744 if (sce->ics.num_windows == 1) {
745 start2 = FFMAX(peakpos - 2, start2);
746 end2 = FFMIN(peakpos + 3, end2);
752 thr = pow(thr / (avg_energy * (end2 - start2)), 0.3 + 0.1*(lastband - g) / lastband);
753 t = 1.0 - (1.0 * start2 / last);
754 uplim[w*16+g] = distfact / (1.4 * thr + t*t*t + 0.075);
757 memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
758 abs_pow34_v(s->scoefs, sce->coeffs, 1024);
759 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
761 for (g = 0; g < sce->ics.num_swb; g++) {
762 const float *coefs = sce->coeffs + start;
763 const float *scaled = s->scoefs + start;
764 const int size = sce->ics.swb_sizes[g];
765 int scf, prev_scf, step;
766 int min_scf = 0, max_scf = 255;
768 if (maxq[w*16+g] < 21.544) {
769 sce->zeroes[w*16+g] = 1;
773 sce->zeroes[w*16+g] = 0;
774 scf = prev_scf = av_clip(SCALE_ONE_POS - SCALE_DIV_512 - log2(1/maxq[w*16+g])*16/3, 60, 218);
780 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
782 dist += quantize_band_cost(s, coefs + w2*128,
784 sce->ics.swb_sizes[g],
792 dist *= 1.0f / 512.0f / lambda;
793 quant_max = quant(maxq[w*16+g], ff_aac_pow2sf_tab[200 - scf + SCALE_ONE_POS - SCALE_DIV_512]);
794 if (quant_max >= 8191) { // too much, return to the previous quantizer
795 sce->sf_idx[w*16+g] = prev_scf;
799 curdiff = fabsf(dist - uplim[w*16+g]);
803 step = fabsf(log2(curdiff));
804 if (dist > uplim[w*16+g])
806 if (FFABS(step) <= 1 || (step > 0 && scf >= max_scf) || (step < 0 && scf <= min_scf)) {
807 sce->sf_idx[w*16+g] = scf;
819 minq = sce->sf_idx[0] ? sce->sf_idx[0] : INT_MAX;
820 for (i = 1; i < 128; i++) {
822 sce->sf_idx[i] = sce->sf_idx[i-1];
824 minq = FFMIN(minq, sce->sf_idx[i]);
828 minq = FFMIN(minq, SCALE_MAX_POS);
829 maxsf = FFMIN(minq + SCALE_MAX_DIFF, SCALE_MAX_POS);
830 for (i = 126; i >= 0; i--) {
832 sce->sf_idx[i] = sce->sf_idx[i+1];
833 sce->sf_idx[i] = av_clip(sce->sf_idx[i], minq, maxsf);
837 static void search_for_quantizers_fast(AVCodecContext *avctx, AACEncContext *s,
838 SingleChannelElement *sce,
841 int start = 0, i, w, w2, g;
844 memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
845 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
847 for (g = 0; g < sce->ics.num_swb; g++) {
848 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
849 FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
850 if (band->energy <= band->threshold) {
851 sce->sf_idx[(w+w2)*16+g] = 218;
852 sce->zeroes[(w+w2)*16+g] = 1;
854 sce->sf_idx[(w+w2)*16+g] = av_clip(SCALE_ONE_POS - SCALE_DIV_512 + log2(band->threshold), 80, 218);
855 sce->zeroes[(w+w2)*16+g] = 0;
857 minq = FFMIN(minq, sce->sf_idx[(w+w2)*16+g]);
861 for (i = 0; i < 128; i++) {
862 sce->sf_idx[i] = 140;
863 //av_clip(sce->sf_idx[i], minq, minq + SCALE_MAX_DIFF - 1);
865 //set the same quantizers inside window groups
866 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
867 for (g = 0; g < sce->ics.num_swb; g++)
868 for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
869 sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
872 static void search_for_ms(AACEncContext *s, ChannelElement *cpe,
875 int start = 0, i, w, w2, g;
876 float M[128], S[128];
877 float *L34 = s->scoefs, *R34 = s->scoefs + 128, *M34 = s->scoefs + 128*2, *S34 = s->scoefs + 128*3;
878 SingleChannelElement *sce0 = &cpe->ch[0];
879 SingleChannelElement *sce1 = &cpe->ch[1];
880 if (!cpe->common_window)
882 for (w = 0; w < sce0->ics.num_windows; w += sce0->ics.group_len[w]) {
883 for (g = 0; g < sce0->ics.num_swb; g++) {
884 if (!cpe->ch[0].zeroes[w*16+g] && !cpe->ch[1].zeroes[w*16+g]) {
885 float dist1 = 0.0f, dist2 = 0.0f;
886 for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
887 FFPsyBand *band0 = &s->psy.psy_bands[(s->cur_channel+0)*PSY_MAX_BANDS+(w+w2)*16+g];
888 FFPsyBand *band1 = &s->psy.psy_bands[(s->cur_channel+1)*PSY_MAX_BANDS+(w+w2)*16+g];
889 float minthr = FFMIN(band0->threshold, band1->threshold);
890 float maxthr = FFMAX(band0->threshold, band1->threshold);
891 for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
892 M[i] = (sce0->coeffs[start+w2*128+i]
893 + sce1->coeffs[start+w2*128+i]) * 0.5;
894 S[i] = sce0->coeffs[start+w2*128+i]
895 - sce1->coeffs[start+w2*128+i];
897 abs_pow34_v(L34, sce0->coeffs+start+w2*128, sce0->ics.swb_sizes[g]);
898 abs_pow34_v(R34, sce1->coeffs+start+w2*128, sce0->ics.swb_sizes[g]);
899 abs_pow34_v(M34, M, sce0->ics.swb_sizes[g]);
900 abs_pow34_v(S34, S, sce0->ics.swb_sizes[g]);
901 dist1 += quantize_band_cost(s, sce0->coeffs + start + w2*128,
903 sce0->ics.swb_sizes[g],
904 sce0->sf_idx[(w+w2)*16+g],
905 sce0->band_type[(w+w2)*16+g],
906 lambda / band0->threshold, INFINITY, NULL);
907 dist1 += quantize_band_cost(s, sce1->coeffs + start + w2*128,
909 sce1->ics.swb_sizes[g],
910 sce1->sf_idx[(w+w2)*16+g],
911 sce1->band_type[(w+w2)*16+g],
912 lambda / band1->threshold, INFINITY, NULL);
913 dist2 += quantize_band_cost(s, M,
915 sce0->ics.swb_sizes[g],
916 sce0->sf_idx[(w+w2)*16+g],
917 sce0->band_type[(w+w2)*16+g],
918 lambda / maxthr, INFINITY, NULL);
919 dist2 += quantize_band_cost(s, S,
921 sce1->ics.swb_sizes[g],
922 sce1->sf_idx[(w+w2)*16+g],
923 sce1->band_type[(w+w2)*16+g],
924 lambda / minthr, INFINITY, NULL);
926 cpe->ms_mask[w*16+g] = dist2 < dist1;
928 start += sce0->ics.swb_sizes[g];
933 AACCoefficientsEncoder ff_aac_coders[] = {
935 search_for_quantizers_faac,
936 encode_window_bands_info,
937 quantize_and_encode_band,
941 search_for_quantizers_anmr,
942 encode_window_bands_info,
943 quantize_and_encode_band,
947 search_for_quantizers_twoloop,
948 encode_window_bands_info,
949 quantize_and_encode_band,
953 search_for_quantizers_fast,
954 encode_window_bands_info,
955 quantize_and_encode_band,