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
24 * AAC coefficients encoder
27 /***********************************
29 * speedup quantizer selection
30 * add sane pulse detection
31 ***********************************/
33 #include "libavutil/libm.h" // brought forward to work around cygwin header breakage
43 /** bits needed to code codebook run value for long windows */
44 static const uint8_t run_value_bits_long[64] = {
45 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
46 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 10,
47 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
48 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 15
51 /** bits needed to code codebook run value for short windows */
52 static const uint8_t run_value_bits_short[16] = {
53 3, 3, 3, 3, 3, 3, 3, 6, 6, 6, 6, 6, 6, 6, 6, 9
56 static const uint8_t *run_value_bits[2] = {
57 run_value_bits_long, run_value_bits_short
62 * Quantize one coefficient.
63 * @return absolute value of the quantized coefficient
64 * @see 3GPP TS26.403 5.6.2 "Scalefactor determination"
66 static av_always_inline int quant(float coef, const float Q)
69 return sqrtf(a * sqrtf(a)) + 0.4054;
72 static void quantize_bands(int *out, const float *in, const float *scaled,
73 int size, float Q34, int is_signed, int maxval)
77 for (i = 0; i < size; i++) {
79 out[i] = (int)FFMIN(qc + 0.4054, (double)maxval);
80 if (is_signed && in[i] < 0.0f) {
86 static void abs_pow34_v(float *out, const float *in, const int size)
88 #ifndef USE_REALLY_FULL_SEARCH
90 for (i = 0; i < size; i++) {
91 float a = fabsf(in[i]);
92 out[i] = sqrtf(a * sqrtf(a));
94 #endif /* USE_REALLY_FULL_SEARCH */
97 static const uint8_t aac_cb_range [12] = {0, 3, 3, 3, 3, 9, 9, 8, 8, 13, 13, 17};
98 static const uint8_t aac_cb_maxval[12] = {0, 1, 1, 2, 2, 4, 4, 7, 7, 12, 12, 16};
101 * Calculate rate distortion cost for quantizing with given codebook
103 * @return quantization distortion
105 static av_always_inline float quantize_and_encode_band_cost_template(
106 struct AACEncContext *s,
107 PutBitContext *pb, const float *in,
108 const float *scaled, int size, int scale_idx,
109 int cb, const float lambda, const float uplim,
110 int *bits, int BT_ZERO, int BT_UNSIGNED,
111 int BT_PAIR, int BT_ESC)
113 const float IQ = ff_aac_pow2sf_tab[POW_SF2_ZERO + scale_idx - SCALE_ONE_POS + SCALE_DIV_512];
114 const float Q = ff_aac_pow2sf_tab[POW_SF2_ZERO - scale_idx + SCALE_ONE_POS - SCALE_DIV_512];
115 const float CLIPPED_ESCAPE = 165140.0f*IQ;
118 const int dim = BT_PAIR ? 2 : 4;
120 const float Q34 = sqrtf(Q * sqrtf(Q));
121 const int range = aac_cb_range[cb];
122 const int maxval = aac_cb_maxval[cb];
126 for (i = 0; i < size; i++)
130 return cost * lambda;
133 abs_pow34_v(s->scoefs, in, size);
136 quantize_bands(s->qcoefs, in, scaled, size, Q34, !BT_UNSIGNED, maxval);
142 for (i = 0; i < size; i += dim) {
144 int *quants = s->qcoefs + i;
148 for (j = 0; j < dim; j++) {
150 curidx += quants[j] + off;
152 curbits = ff_aac_spectral_bits[cb-1][curidx];
153 vec = &ff_aac_codebook_vectors[cb-1][curidx*dim];
155 for (j = 0; j < dim; j++) {
156 float t = fabsf(in[i+j]);
158 if (BT_ESC && vec[j] == 64.0f) { //FIXME: slow
159 if (t >= CLIPPED_ESCAPE) {
160 di = t - CLIPPED_ESCAPE;
163 int c = av_clip(quant(t, Q), 0, 8191);
164 di = t - c*cbrtf(c)*IQ;
165 curbits += av_log2(c)*2 - 4 + 1;
175 for (j = 0; j < dim; j++) {
176 float di = in[i+j] - vec[j]*IQ;
180 cost += rd * lambda + curbits;
185 put_bits(pb, ff_aac_spectral_bits[cb-1][curidx], ff_aac_spectral_codes[cb-1][curidx]);
187 for (j = 0; j < dim; j++)
188 if (ff_aac_codebook_vectors[cb-1][curidx*dim+j] != 0.0f)
189 put_bits(pb, 1, in[i+j] < 0.0f);
191 for (j = 0; j < 2; j++) {
192 if (ff_aac_codebook_vectors[cb-1][curidx*2+j] == 64.0f) {
193 int coef = av_clip(quant(fabsf(in[i+j]), Q), 0, 8191);
194 int len = av_log2(coef);
196 put_bits(pb, len - 4 + 1, (1 << (len - 4 + 1)) - 2);
197 put_bits(pb, len, coef & ((1 << len) - 1));
209 #define QUANTIZE_AND_ENCODE_BAND_COST_FUNC(NAME, BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC) \
210 static float quantize_and_encode_band_cost_ ## NAME( \
211 struct AACEncContext *s, \
212 PutBitContext *pb, const float *in, \
213 const float *scaled, int size, int scale_idx, \
214 int cb, const float lambda, const float uplim, \
216 return quantize_and_encode_band_cost_template( \
217 s, pb, in, scaled, size, scale_idx, \
218 BT_ESC ? ESC_BT : cb, lambda, uplim, bits, \
219 BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC); \
222 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ZERO, 1, 0, 0, 0)
223 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SQUAD, 0, 0, 0, 0)
224 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UQUAD, 0, 1, 0, 0)
225 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SPAIR, 0, 0, 1, 0)
226 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UPAIR, 0, 1, 1, 0)
227 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ESC, 0, 1, 1, 1)
229 static float (*const quantize_and_encode_band_cost_arr[])(
230 struct AACEncContext *s,
231 PutBitContext *pb, const float *in,
232 const float *scaled, int size, int scale_idx,
233 int cb, const float lambda, const float uplim,
235 quantize_and_encode_band_cost_ZERO,
236 quantize_and_encode_band_cost_SQUAD,
237 quantize_and_encode_band_cost_SQUAD,
238 quantize_and_encode_band_cost_UQUAD,
239 quantize_and_encode_band_cost_UQUAD,
240 quantize_and_encode_band_cost_SPAIR,
241 quantize_and_encode_band_cost_SPAIR,
242 quantize_and_encode_band_cost_UPAIR,
243 quantize_and_encode_band_cost_UPAIR,
244 quantize_and_encode_band_cost_UPAIR,
245 quantize_and_encode_band_cost_UPAIR,
246 quantize_and_encode_band_cost_ESC,
249 #define quantize_and_encode_band_cost( \
250 s, pb, in, scaled, size, scale_idx, cb, \
251 lambda, uplim, bits) \
252 quantize_and_encode_band_cost_arr[cb]( \
253 s, pb, in, scaled, size, scale_idx, cb, \
256 static float quantize_band_cost(struct AACEncContext *s, const float *in,
257 const float *scaled, int size, int scale_idx,
258 int cb, const float lambda, const float uplim,
261 return quantize_and_encode_band_cost(s, NULL, in, scaled, size, scale_idx,
262 cb, lambda, uplim, bits);
265 static void quantize_and_encode_band(struct AACEncContext *s, PutBitContext *pb,
266 const float *in, int size, int scale_idx,
267 int cb, const float lambda)
269 quantize_and_encode_band_cost(s, pb, in, NULL, size, scale_idx, cb, lambda,
273 static float find_max_val(int group_len, int swb_size, const float *scaled) {
276 for (w2 = 0; w2 < group_len; w2++) {
277 for (i = 0; i < swb_size; i++) {
278 maxval = FFMAX(maxval, scaled[w2*128+i]);
284 static int find_min_book(float maxval, int sf) {
285 float Q = ff_aac_pow2sf_tab[POW_SF2_ZERO - sf + SCALE_ONE_POS - SCALE_DIV_512];
286 float Q34 = sqrtf(Q * sqrtf(Q));
288 qmaxval = maxval * Q34 + 0.4054f;
289 if (qmaxval == 0) cb = 0;
290 else if (qmaxval == 1) cb = 1;
291 else if (qmaxval == 2) cb = 3;
292 else if (qmaxval <= 4) cb = 5;
293 else if (qmaxval <= 7) cb = 7;
294 else if (qmaxval <= 12) cb = 9;
300 * structure used in optimal codebook search
302 typedef struct BandCodingPath {
303 int prev_idx; ///< pointer to the previous path point
304 float cost; ///< path cost
309 * Encode band info for single window group bands.
311 static void encode_window_bands_info(AACEncContext *s, SingleChannelElement *sce,
312 int win, int group_len, const float lambda)
314 BandCodingPath path[120][12];
315 int w, swb, cb, start, size;
317 const int max_sfb = sce->ics.max_sfb;
318 const int run_bits = sce->ics.num_windows == 1 ? 5 : 3;
319 const int run_esc = (1 << run_bits) - 1;
320 int idx, ppos, count;
321 int stackrun[120], stackcb[120], stack_len;
322 float next_minrd = INFINITY;
325 abs_pow34_v(s->scoefs, sce->coeffs, 1024);
327 for (cb = 0; cb < 12; cb++) {
328 path[0][cb].cost = 0.0f;
329 path[0][cb].prev_idx = -1;
332 for (swb = 0; swb < max_sfb; swb++) {
333 size = sce->ics.swb_sizes[swb];
334 if (sce->zeroes[win*16 + swb]) {
335 for (cb = 0; cb < 12; cb++) {
336 path[swb+1][cb].prev_idx = cb;
337 path[swb+1][cb].cost = path[swb][cb].cost;
338 path[swb+1][cb].run = path[swb][cb].run + 1;
341 float minrd = next_minrd;
342 int mincb = next_mincb;
343 next_minrd = INFINITY;
345 for (cb = 0; cb < 12; cb++) {
346 float cost_stay_here, cost_get_here;
348 for (w = 0; w < group_len; w++) {
349 FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(win+w)*16+swb];
350 rd += quantize_band_cost(s, sce->coeffs + start + w*128,
351 s->scoefs + start + w*128, size,
352 sce->sf_idx[(win+w)*16+swb], cb,
353 lambda / band->threshold, INFINITY, NULL);
355 cost_stay_here = path[swb][cb].cost + rd;
356 cost_get_here = minrd + rd + run_bits + 4;
357 if ( run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run]
358 != run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run+1])
359 cost_stay_here += run_bits;
360 if (cost_get_here < cost_stay_here) {
361 path[swb+1][cb].prev_idx = mincb;
362 path[swb+1][cb].cost = cost_get_here;
363 path[swb+1][cb].run = 1;
365 path[swb+1][cb].prev_idx = cb;
366 path[swb+1][cb].cost = cost_stay_here;
367 path[swb+1][cb].run = path[swb][cb].run + 1;
369 if (path[swb+1][cb].cost < next_minrd) {
370 next_minrd = path[swb+1][cb].cost;
375 start += sce->ics.swb_sizes[swb];
378 //convert resulting path from backward-linked list
381 for (cb = 1; cb < 12; cb++)
382 if (path[max_sfb][cb].cost < path[max_sfb][idx].cost)
387 stackrun[stack_len] = path[ppos][cb].run;
388 stackcb [stack_len] = cb;
389 idx = path[ppos-path[ppos][cb].run+1][cb].prev_idx;
390 ppos -= path[ppos][cb].run;
393 //perform actual band info encoding
395 for (i = stack_len - 1; i >= 0; i--) {
396 put_bits(&s->pb, 4, stackcb[i]);
398 memset(sce->zeroes + win*16 + start, !stackcb[i], count);
399 //XXX: memset when band_type is also uint8_t
400 for (j = 0; j < count; j++) {
401 sce->band_type[win*16 + start] = stackcb[i];
404 while (count >= run_esc) {
405 put_bits(&s->pb, run_bits, run_esc);
408 put_bits(&s->pb, run_bits, count);
412 static void codebook_trellis_rate(AACEncContext *s, SingleChannelElement *sce,
413 int win, int group_len, const float lambda)
415 BandCodingPath path[120][12];
416 int w, swb, cb, start, size;
418 const int max_sfb = sce->ics.max_sfb;
419 const int run_bits = sce->ics.num_windows == 1 ? 5 : 3;
420 const int run_esc = (1 << run_bits) - 1;
421 int idx, ppos, count;
422 int stackrun[120], stackcb[120], stack_len;
423 float next_minrd = INFINITY;
426 abs_pow34_v(s->scoefs, sce->coeffs, 1024);
428 for (cb = 0; cb < 12; cb++) {
429 path[0][cb].cost = run_bits+4;
430 path[0][cb].prev_idx = -1;
433 for (swb = 0; swb < max_sfb; swb++) {
434 size = sce->ics.swb_sizes[swb];
435 if (sce->zeroes[win*16 + swb]) {
436 for (cb = 0; cb < 12; cb++) {
437 path[swb+1][cb].prev_idx = cb;
438 path[swb+1][cb].cost = path[swb][cb].cost;
439 path[swb+1][cb].run = path[swb][cb].run + 1;
442 float minrd = next_minrd;
443 int mincb = next_mincb;
444 int startcb = sce->band_type[win*16+swb];
445 next_minrd = INFINITY;
447 for (cb = 0; cb < startcb; cb++) {
448 path[swb+1][cb].cost = 61450;
449 path[swb+1][cb].prev_idx = -1;
450 path[swb+1][cb].run = 0;
452 for (cb = startcb; cb < 12; cb++) {
453 float cost_stay_here, cost_get_here;
455 for (w = 0; w < group_len; w++) {
456 rd += quantize_band_cost(s, sce->coeffs + start + w*128,
457 s->scoefs + start + w*128, size,
458 sce->sf_idx[(win+w)*16+swb], cb,
461 cost_stay_here = path[swb][cb].cost + rd;
462 cost_get_here = minrd + rd + run_bits + 4;
463 if ( run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run]
464 != run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run+1])
465 cost_stay_here += run_bits;
466 if (cost_get_here < cost_stay_here) {
467 path[swb+1][cb].prev_idx = mincb;
468 path[swb+1][cb].cost = cost_get_here;
469 path[swb+1][cb].run = 1;
471 path[swb+1][cb].prev_idx = cb;
472 path[swb+1][cb].cost = cost_stay_here;
473 path[swb+1][cb].run = path[swb][cb].run + 1;
475 if (path[swb+1][cb].cost < next_minrd) {
476 next_minrd = path[swb+1][cb].cost;
481 start += sce->ics.swb_sizes[swb];
484 //convert resulting path from backward-linked list
487 for (cb = 1; cb < 12; cb++)
488 if (path[max_sfb][cb].cost < path[max_sfb][idx].cost)
494 stackrun[stack_len] = path[ppos][cb].run;
495 stackcb [stack_len] = cb;
496 idx = path[ppos-path[ppos][cb].run+1][cb].prev_idx;
497 ppos -= path[ppos][cb].run;
500 //perform actual band info encoding
502 for (i = stack_len - 1; i >= 0; i--) {
503 put_bits(&s->pb, 4, stackcb[i]);
505 memset(sce->zeroes + win*16 + start, !stackcb[i], count);
506 //XXX: memset when band_type is also uint8_t
507 for (j = 0; j < count; j++) {
508 sce->band_type[win*16 + start] = stackcb[i];
511 while (count >= run_esc) {
512 put_bits(&s->pb, run_bits, run_esc);
515 put_bits(&s->pb, run_bits, count);
519 /** Return the minimum scalefactor where the quantized coef does not clip. */
520 static av_always_inline uint8_t coef2minsf(float coef) {
521 return av_clip_uint8(log2f(coef)*4 - 69 + SCALE_ONE_POS - SCALE_DIV_512);
524 /** Return the maximum scalefactor where the quantized coef is not zero. */
525 static av_always_inline uint8_t coef2maxsf(float coef) {
526 return av_clip_uint8(log2f(coef)*4 + 6 + SCALE_ONE_POS - SCALE_DIV_512);
529 typedef struct TrellisPath {
534 #define TRELLIS_STAGES 121
535 #define TRELLIS_STATES (SCALE_MAX_DIFF+1)
537 static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s,
538 SingleChannelElement *sce,
541 int q, w, w2, g, start = 0;
544 TrellisPath paths[TRELLIS_STAGES][TRELLIS_STATES];
545 int bandaddr[TRELLIS_STAGES];
548 float q0f = FLT_MAX, q1f = 0.0f, qnrgf = 0.0f;
549 int q0, q1, qcnt = 0;
551 for (i = 0; i < 1024; i++) {
552 float t = fabsf(sce->coeffs[i]);
562 memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
563 memset(sce->zeroes, 1, sizeof(sce->zeroes));
567 //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
568 q0 = coef2minsf(q0f);
569 //maximum scalefactor index is when maximum coefficient after quantizing is still not zero
570 q1 = coef2maxsf(q1f);
571 //av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);
575 //minimum scalefactor index is when maximum nonzero coefficient after quantizing is not clipped
576 int qnrg = av_clip_uint8(log2f(sqrtf(qnrgf/qcnt))*4 - 31 + SCALE_ONE_POS - SCALE_DIV_512);
579 //av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);
583 } else if (q1 > q1high) {
588 //av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);
590 for (i = 0; i < TRELLIS_STATES; i++) {
591 paths[0][i].cost = 0.0f;
592 paths[0][i].prev = -1;
594 for (j = 1; j < TRELLIS_STAGES; j++) {
595 for (i = 0; i < TRELLIS_STATES; i++) {
596 paths[j][i].cost = INFINITY;
597 paths[j][i].prev = -2;
601 abs_pow34_v(s->scoefs, sce->coeffs, 1024);
602 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
604 for (g = 0; g < sce->ics.num_swb; g++) {
605 const float *coefs = sce->coeffs + start;
609 bandaddr[idx] = w * 16 + g;
612 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
613 FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
614 if (band->energy <= band->threshold || band->threshold == 0.0f) {
615 sce->zeroes[(w+w2)*16+g] = 1;
618 sce->zeroes[(w+w2)*16+g] = 0;
620 for (i = 0; i < sce->ics.swb_sizes[g]; i++) {
621 float t = fabsf(coefs[w2*128+i]);
623 qmin = FFMIN(qmin, t);
624 qmax = FFMAX(qmax, t);
628 int minscale, maxscale;
629 float minrd = INFINITY;
631 //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
632 minscale = coef2minsf(qmin);
633 //maximum scalefactor index is when maximum coefficient after quantizing is still not zero
634 maxscale = coef2maxsf(qmax);
635 minscale = av_clip(minscale - q0, 0, TRELLIS_STATES - 1);
636 maxscale = av_clip(maxscale - q0, 0, TRELLIS_STATES);
637 maxval = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], s->scoefs+start);
638 for (q = minscale; q < maxscale; q++) {
640 int cb = find_min_book(maxval, sce->sf_idx[w*16+g]);
641 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
642 FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
643 dist += quantize_band_cost(s, coefs + w2*128, s->scoefs + start + w2*128, sce->ics.swb_sizes[g],
644 q + q0, cb, lambda / band->threshold, INFINITY, NULL);
646 minrd = FFMIN(minrd, dist);
648 for (i = 0; i < q1 - q0; i++) {
650 cost = paths[idx - 1][i].cost + dist
651 + ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO];
652 if (cost < paths[idx][q].cost) {
653 paths[idx][q].cost = cost;
654 paths[idx][q].prev = i;
659 for (q = 0; q < q1 - q0; q++) {
660 paths[idx][q].cost = paths[idx - 1][q].cost + 1;
661 paths[idx][q].prev = q;
664 sce->zeroes[w*16+g] = !nz;
665 start += sce->ics.swb_sizes[g];
670 mincost = paths[idx][0].cost;
672 for (i = 1; i < TRELLIS_STATES; i++) {
673 if (paths[idx][i].cost < mincost) {
674 mincost = paths[idx][i].cost;
679 sce->sf_idx[bandaddr[idx]] = minq + q0;
680 minq = paths[idx][minq].prev;
683 //set the same quantizers inside window groups
684 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
685 for (g = 0; g < sce->ics.num_swb; g++)
686 for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
687 sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
691 * two-loop quantizers search taken from ISO 13818-7 Appendix C
693 static void search_for_quantizers_twoloop(AVCodecContext *avctx,
695 SingleChannelElement *sce,
698 int start = 0, i, w, w2, g;
699 int destbits = avctx->bit_rate * 1024.0 / avctx->sample_rate / avctx->channels;
700 float dists[128], uplims[128];
702 int fflag, minscaler;
705 float minthr = INFINITY;
707 //XXX: some heuristic to determine initial quantizers will reduce search time
708 memset(dists, 0, sizeof(dists));
709 //determine zero bands and upper limits
710 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
711 for (g = 0; g < sce->ics.num_swb; g++) {
714 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
715 FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
716 uplim += band->threshold;
717 if (band->energy <= band->threshold || band->threshold == 0.0f) {
718 sce->zeroes[(w+w2)*16+g] = 1;
723 uplims[w*16+g] = uplim *512;
724 sce->zeroes[w*16+g] = !nz;
726 minthr = FFMIN(minthr, uplim);
730 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
731 for (g = 0; g < sce->ics.num_swb; g++) {
732 if (sce->zeroes[w*16+g]) {
733 sce->sf_idx[w*16+g] = SCALE_ONE_POS;
736 sce->sf_idx[w*16+g] = SCALE_ONE_POS + FFMIN(log2f(uplims[w*16+g]/minthr)*4,59);
742 abs_pow34_v(s->scoefs, sce->coeffs, 1024);
744 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
746 for (g = 0; g < sce->ics.num_swb; g++) {
747 const float *scaled = s->scoefs + start;
748 maxvals[w*16+g] = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], scaled);
749 start += sce->ics.swb_sizes[g];
753 //perform two-loop search
754 //outer loop - improve quality
757 minscaler = sce->sf_idx[0];
758 //inner loop - quantize spectrum to fit into given number of bits
759 qstep = its ? 1 : 32;
764 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
766 for (g = 0; g < sce->ics.num_swb; g++) {
767 const float *coefs = sce->coeffs + start;
768 const float *scaled = s->scoefs + start;
773 if (sce->zeroes[w*16+g] || sce->sf_idx[w*16+g] >= 218) {
774 start += sce->ics.swb_sizes[g];
777 minscaler = FFMIN(minscaler, sce->sf_idx[w*16+g]);
778 cb = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);
779 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
781 dist += quantize_band_cost(s, coefs + w2*128,
783 sce->ics.swb_sizes[g],
791 dists[w*16+g] = dist - bits;
793 bits += ff_aac_scalefactor_bits[sce->sf_idx[w*16+g] - prev + SCALE_DIFF_ZERO];
796 start += sce->ics.swb_sizes[g];
797 prev = sce->sf_idx[w*16+g];
800 if (tbits > destbits) {
801 for (i = 0; i < 128; i++)
802 if (sce->sf_idx[i] < 218 - qstep)
803 sce->sf_idx[i] += qstep;
805 for (i = 0; i < 128; i++)
806 if (sce->sf_idx[i] > 60 - qstep)
807 sce->sf_idx[i] -= qstep;
810 if (!qstep && tbits > destbits*1.02 && sce->sf_idx[0] < 217)
815 minscaler = av_clip(minscaler, 60, 255 - SCALE_MAX_DIFF);
816 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
817 for (g = 0; g < sce->ics.num_swb; g++) {
818 int prevsc = sce->sf_idx[w*16+g];
819 if (dists[w*16+g] > uplims[w*16+g] && sce->sf_idx[w*16+g] > 60) {
820 if (find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]-1))
821 sce->sf_idx[w*16+g]--;
822 else //Try to make sure there is some energy in every band
823 sce->sf_idx[w*16+g]-=2;
825 sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler, minscaler + SCALE_MAX_DIFF);
826 sce->sf_idx[w*16+g] = FFMIN(sce->sf_idx[w*16+g], 219);
827 if (sce->sf_idx[w*16+g] != prevsc)
829 sce->band_type[w*16+g] = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);
833 } while (fflag && its < 10);
836 static void search_for_quantizers_faac(AVCodecContext *avctx, AACEncContext *s,
837 SingleChannelElement *sce,
840 int start = 0, i, w, w2, g;
841 float uplim[128], maxq[128];
843 float distfact = ((sce->ics.num_windows > 1) ? 85.80 : 147.84) / lambda;
844 int last = 0, lastband = 0, curband = 0;
845 float avg_energy = 0.0;
846 if (sce->ics.num_windows == 1) {
848 for (i = 0; i < 1024; i++) {
849 if (i - start >= sce->ics.swb_sizes[curband]) {
850 start += sce->ics.swb_sizes[curband];
853 if (sce->coeffs[i]) {
854 avg_energy += sce->coeffs[i] * sce->coeffs[i];
860 for (w = 0; w < 8; w++) {
861 const float *coeffs = sce->coeffs + w*128;
863 for (i = 0; i < 128; i++) {
864 if (i - start >= sce->ics.swb_sizes[curband]) {
865 start += sce->ics.swb_sizes[curband];
869 avg_energy += coeffs[i] * coeffs[i];
870 last = FFMAX(last, i);
871 lastband = FFMAX(lastband, curband);
878 if (avg_energy == 0.0f) {
879 for (i = 0; i < FF_ARRAY_ELEMS(sce->sf_idx); i++)
880 sce->sf_idx[i] = SCALE_ONE_POS;
883 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
885 for (g = 0; g < sce->ics.num_swb; g++) {
886 float *coefs = sce->coeffs + start;
887 const int size = sce->ics.swb_sizes[g];
888 int start2 = start, end2 = start + size, peakpos = start;
889 float maxval = -1, thr = 0.0f, t;
894 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++)
895 memset(coefs + w2*128, 0, sizeof(coefs[0])*size);
898 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
899 for (i = 0; i < size; i++) {
900 float t = coefs[w2*128+i]*coefs[w2*128+i];
901 maxq[w*16+g] = FFMAX(maxq[w*16+g], fabsf(coefs[w2*128 + i]));
903 if (sce->ics.num_windows == 1 && maxval < t) {
909 if (sce->ics.num_windows == 1) {
910 start2 = FFMAX(peakpos - 2, start2);
911 end2 = FFMIN(peakpos + 3, end2);
917 thr = pow(thr / (avg_energy * (end2 - start2)), 0.3 + 0.1*(lastband - g) / lastband);
918 t = 1.0 - (1.0 * start2 / last);
919 uplim[w*16+g] = distfact / (1.4 * thr + t*t*t + 0.075);
922 memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
923 abs_pow34_v(s->scoefs, sce->coeffs, 1024);
924 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
926 for (g = 0; g < sce->ics.num_swb; g++) {
927 const float *coefs = sce->coeffs + start;
928 const float *scaled = s->scoefs + start;
929 const int size = sce->ics.swb_sizes[g];
930 int scf, prev_scf, step;
931 int min_scf = -1, max_scf = 256;
933 if (maxq[w*16+g] < 21.544) {
934 sce->zeroes[w*16+g] = 1;
938 sce->zeroes[w*16+g] = 0;
939 scf = prev_scf = av_clip(SCALE_ONE_POS - SCALE_DIV_512 - log2f(1/maxq[w*16+g])*16/3, 60, 218);
945 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
947 dist += quantize_band_cost(s, coefs + w2*128,
949 sce->ics.swb_sizes[g],
957 dist *= 1.0f / 512.0f / lambda;
958 quant_max = quant(maxq[w*16+g], ff_aac_pow2sf_tab[POW_SF2_ZERO - scf + SCALE_ONE_POS - SCALE_DIV_512]);
959 if (quant_max >= 8191) { // too much, return to the previous quantizer
960 sce->sf_idx[w*16+g] = prev_scf;
964 curdiff = fabsf(dist - uplim[w*16+g]);
968 step = log2f(curdiff);
969 if (dist > uplim[w*16+g])
972 scf = av_clip_uint8(scf);
973 step = scf - prev_scf;
974 if (FFABS(step) <= 1 || (step > 0 && scf >= max_scf) || (step < 0 && scf <= min_scf)) {
975 sce->sf_idx[w*16+g] = av_clip(scf, min_scf, max_scf);
986 minq = sce->sf_idx[0] ? sce->sf_idx[0] : INT_MAX;
987 for (i = 1; i < 128; i++) {
989 sce->sf_idx[i] = sce->sf_idx[i-1];
991 minq = FFMIN(minq, sce->sf_idx[i]);
995 minq = FFMIN(minq, SCALE_MAX_POS);
996 maxsf = FFMIN(minq + SCALE_MAX_DIFF, SCALE_MAX_POS);
997 for (i = 126; i >= 0; i--) {
999 sce->sf_idx[i] = sce->sf_idx[i+1];
1000 sce->sf_idx[i] = av_clip(sce->sf_idx[i], minq, maxsf);
1004 static void search_for_quantizers_fast(AVCodecContext *avctx, AACEncContext *s,
1005 SingleChannelElement *sce,
1011 memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
1012 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
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;
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;
1023 minq = FFMIN(minq, sce->sf_idx[(w+w2)*16+g]);
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);
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];
1038 static void search_for_ms(AACEncContext *s, ChannelElement *cpe,
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)
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;
1061 - sce1->coeffs[start+w2*128+i];
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,
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,
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,
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,
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);
1092 cpe->ms_mask[w*16+g] = dist2 < dist1;
1094 start += sce0->ics.swb_sizes[g];
1099 AACCoefficientsEncoder ff_aac_coders[] = {
1101 search_for_quantizers_faac,
1102 encode_window_bands_info,
1103 quantize_and_encode_band,
1107 search_for_quantizers_anmr,
1108 encode_window_bands_info,
1109 quantize_and_encode_band,
1113 search_for_quantizers_twoloop,
1114 codebook_trellis_rate,
1115 quantize_and_encode_band,
1119 search_for_quantizers_fast,
1120 encode_window_bands_info,
1121 quantize_and_encode_band,