FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/aaccoder.c
Date: 2025-07-11 09:13:03
Exec Total Coverage
Lines: 446 462 96.5%
Functions: 17 18 94.4%
Branches: 332 388 85.6%
Line Branch Exec Source
1 /*
2 * AAC coefficients encoder
3 * Copyright (C) 2008-2009 Konstantin Shishkov
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 /**
23 * @file
24 * AAC coefficients encoder
25 */
26
27 /***********************************
28 * TODOs:
29 * speedup quantizer selection
30 * add sane pulse detection
31 ***********************************/
32
33 #include "libavutil/libm.h" // brought forward to work around cygwin header breakage
34
35 #include <float.h>
36
37 #include "libavutil/mathematics.h"
38 #include "mathops.h"
39 #include "avcodec.h"
40 #include "put_bits.h"
41 #include "aac.h"
42 #include "aacenc.h"
43 #include "aactab.h"
44 #include "aacenctab.h"
45 #include "aacenc_utils.h"
46 #include "aacenc_quantization.h"
47
48 #include "aacenc_is.h"
49 #include "aacenc_tns.h"
50
51 #include "libavcodec/aaccoder_twoloop.h"
52
53 /* Parameter of f(x) = a*(lambda/100), defines the maximum fourier spread
54 * beyond which no PNS is used (since the SFBs contain tone rather than noise) */
55 #define NOISE_SPREAD_THRESHOLD 0.9f
56
57 /* Parameter of f(x) = a*(100/lambda), defines how much PNS is allowed to
58 * replace low energy non zero bands */
59 #define NOISE_LAMBDA_REPLACE 1.948f
60
61 #include "libavcodec/aaccoder_trellis.h"
62
63 typedef float (*quantize_and_encode_band_func)(struct AACEncContext *s, PutBitContext *pb,
64 const float *in, float *quant, const float *scaled,
65 int size, int scale_idx, int cb,
66 const float lambda, const float uplim,
67 int *bits, float *energy);
68
69 /**
70 * Calculate rate distortion cost for quantizing with given codebook
71 *
72 * @return quantization distortion
73 */
74 8425788 static av_always_inline float quantize_and_encode_band_cost_template(
75 struct AACEncContext *s,
76 PutBitContext *pb, const float *in, float *out,
77 const float *scaled, int size, int scale_idx,
78 int cb, const float lambda, const float uplim,
79 int *bits, float *energy, int BT_ZERO, int BT_UNSIGNED,
80 int BT_PAIR, int BT_ESC, int BT_NOISE, int BT_STEREO,
81 const float ROUNDING)
82 {
83 8425788 const int q_idx = POW_SF2_ZERO - scale_idx + SCALE_ONE_POS - SCALE_DIV_512;
84 8425788 const float Q = ff_aac_pow2sf_tab [q_idx];
85 8425788 const float Q34 = ff_aac_pow34sf_tab[q_idx];
86 8425788 const float IQ = ff_aac_pow2sf_tab [POW_SF2_ZERO + scale_idx - SCALE_ONE_POS + SCALE_DIV_512];
87 8425788 const float CLIPPED_ESCAPE = 165140.0f*IQ;
88 8425788 float cost = 0;
89 8425788 float qenergy = 0;
90
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 8425788 const int dim = BT_PAIR ? 2 : 4;
91 8425788 int resbits = 0;
92 int off;
93
94
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 8425788 if (BT_ZERO || BT_NOISE || BT_STEREO) {
95
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 36747250 for (int i = 0; i < size; i++)
96 35183532 cost += in[i]*in[i];
97
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 1563718 if (bits)
98 1540776 *bits = 0;
99
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 1563718 if (energy)
100 1513409 *energy = qenergy;
101
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 1563718 if (out) {
102 ✗ for (int i = 0; i < size; i += dim)
103 ✗ for (int j = 0; j < dim; j++)
104 ✗ out[i+j] = 0.0f;
105 }
106 1563718 return cost * lambda;
107 }
108
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 6862070 if (!scaled) {
109 429687 s->aacdsp.abs_pow34(s->scoefs, in, size);
110 429687 scaled = s->scoefs;
111 }
112 6862070 s->aacdsp.quant_bands(s->qcoefs, in, scaled, size, !BT_UNSIGNED, aac_cb_maxval[cb], Q34, ROUNDING);
113
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 6862070 if (BT_UNSIGNED) {
114 4249191 off = 0;
115 } else {
116 2612879 off = aac_cb_maxval[cb];
117 }
118
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 61304248 for (int i = 0; i < size; i += dim) {
119 const float *vec;
120 54442178 int *quants = s->qcoefs + i;
121 54442178 int curidx = 0;
122 int curbits;
123 54442178 float quantized, rd = 0.0f;
124
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 194451946 for (int j = 0; j < dim; j++) {
125 140009768 curidx *= aac_cb_range[cb];
126 140009768 curidx += quants[j] + off;
127 }
128 54442178 curbits = ff_aac_spectral_bits[cb-1][curidx];
129 54442178 vec = &ff_aac_codebook_vectors[cb-1][curidx*dim];
130
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 54442178 if (BT_UNSIGNED) {
131
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 116734155 for (int j = 0; j < dim; j++) {
132 82250064 float t = fabsf(in[i+j]);
133 float di;
134
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 82250064 if (BT_ESC && vec[j] == 64.0f) { //FIXME: slow
135
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 1598091 if (t >= CLIPPED_ESCAPE) {
136 113 quantized = CLIPPED_ESCAPE;
137 113 curbits += 21;
138 } else {
139 1597978 int c = av_clip_uintp2(quant(t, Q, ROUNDING), 13);
140 1597978 quantized = c*cbrtf(c)*IQ;
141 1597978 curbits += av_log2(c)*2 - 4 + 1;
142 }
143 } else {
144 80651973 quantized = vec[j]*IQ;
145 }
146 82250064 di = t - quantized;
147
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 82250064 if (out)
148 ✗ out[i+j] = in[i+j] >= 0 ? quantized : -quantized;
149
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 82250064 if (vec[j] != 0.0f)
150 48894607 curbits++;
151 82250064 qenergy += quantized*quantized;
152 82250064 rd += di*di;
153 }
154 } else {
155
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 77717791 for (int j = 0; j < dim; j++) {
156 57759704 quantized = vec[j]*IQ;
157 57759704 qenergy += quantized*quantized;
158
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 57759704 if (out)
159 ✗ out[i+j] = quantized;
160 57759704 rd += (in[i+j] - quantized)*(in[i+j] - quantized);
161 }
162 }
163 54442178 cost += rd * lambda + curbits;
164 54442178 resbits += curbits;
165
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 54442178 if (cost >= uplim)
166 ✗ return uplim;
167
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 54442178 if (pb) {
168 3138085 put_bits(pb, ff_aac_spectral_bits[cb-1][curidx], ff_aac_spectral_codes[cb-1][curidx]);
169
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 3138085 if (BT_UNSIGNED)
170
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 6064436 for (int j = 0; j < dim; j++)
171
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 4388088 if (ff_aac_codebook_vectors[cb-1][curidx*dim+j] != 0.0f)
172 3089271 put_bits(pb, 1, in[i+j] < 0.0f);
173
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 3138085 if (BT_ESC) {
174
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175
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 888900 if (ff_aac_codebook_vectors[cb-1][curidx*2+j] == 64.0f) {
176 131744 int coef = av_clip_uintp2(quant(fabsf(in[i+j]), Q, ROUNDING), 13);
177 131744 int len = av_log2(coef);
178
179 131744 put_bits(pb, len - 4 + 1, (1 << (len - 4 + 1)) - 2);
180 131744 put_sbits(pb, len, coef);
181 }
182 }
183 }
184 }
185 }
186
187
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 6862070 if (bits)
188 6361490 *bits = resbits;
189
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 6862070 if (energy)
190 3150348 *energy = qenergy;
191 6862070 return cost;
192 }
193
194 ✗ static inline float quantize_and_encode_band_cost_NONE(struct AACEncContext *s, PutBitContext *pb,
195 const float *in, float *quant, const float *scaled,
196 int size, int scale_idx, int cb,
197 const float lambda, const float uplim,
198 int *bits, float *energy) {
199 ✗ av_assert0(0);
200 return 0.0f;
201 }
202
203 #define QUANTIZE_AND_ENCODE_BAND_COST_FUNC(NAME, BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC, BT_NOISE, BT_STEREO, ROUNDING) \
204 static float quantize_and_encode_band_cost_ ## NAME( \
205 struct AACEncContext *s, \
206 PutBitContext *pb, const float *in, float *quant, \
207 const float *scaled, int size, int scale_idx, \
208 int cb, const float lambda, const float uplim, \
209 int *bits, float *energy) { \
210 return quantize_and_encode_band_cost_template( \
211 s, pb, in, quant, scaled, size, scale_idx, \
212 BT_ESC ? ESC_BT : cb, lambda, uplim, bits, energy, \
213 BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC, BT_NOISE, BT_STEREO, \
214 ROUNDING); \
215 }
216
217 1533068 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ZERO, 1, 0, 0, 0, 0, 0, ROUND_STANDARD)
218 1490390 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SQUAD, 0, 0, 0, 0, 0, 0, ROUND_STANDARD)
219 1192300 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UQUAD, 0, 1, 0, 0, 0, 0, ROUND_STANDARD)
220 1122489 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SPAIR, 0, 0, 1, 0, 0, 0, ROUND_STANDARD)
221 2101402 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UPAIR, 0, 1, 1, 0, 0, 0, ROUND_STANDARD)
222 950393 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ESC, 0, 1, 1, 1, 0, 0, ROUND_STANDARD)
223 5096 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ESC_RTZ, 0, 1, 1, 1, 0, 0, ROUND_TO_ZERO)
224 13300 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(NOISE, 0, 0, 0, 0, 1, 0, ROUND_STANDARD)
225 17350 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(STEREO,0, 0, 0, 0, 0, 1, ROUND_STANDARD)
226
227 static const quantize_and_encode_band_func quantize_and_encode_band_cost_arr[] =
228 {
229 quantize_and_encode_band_cost_ZERO,
230 quantize_and_encode_band_cost_SQUAD,
231 quantize_and_encode_band_cost_SQUAD,
232 quantize_and_encode_band_cost_UQUAD,
233 quantize_and_encode_band_cost_UQUAD,
234 quantize_and_encode_band_cost_SPAIR,
235 quantize_and_encode_band_cost_SPAIR,
236 quantize_and_encode_band_cost_UPAIR,
237 quantize_and_encode_band_cost_UPAIR,
238 quantize_and_encode_band_cost_UPAIR,
239 quantize_and_encode_band_cost_UPAIR,
240 quantize_and_encode_band_cost_ESC,
241 quantize_and_encode_band_cost_NONE, /* CB 12 doesn't exist */
242 quantize_and_encode_band_cost_NOISE,
243 quantize_and_encode_band_cost_STEREO,
244 quantize_and_encode_band_cost_STEREO,
245 };
246
247 static const quantize_and_encode_band_func quantize_and_encode_band_cost_rtz_arr[] =
248 {
249 quantize_and_encode_band_cost_ZERO,
250 quantize_and_encode_band_cost_SQUAD,
251 quantize_and_encode_band_cost_SQUAD,
252 quantize_and_encode_band_cost_UQUAD,
253 quantize_and_encode_band_cost_UQUAD,
254 quantize_and_encode_band_cost_SPAIR,
255 quantize_and_encode_band_cost_SPAIR,
256 quantize_and_encode_band_cost_UPAIR,
257 quantize_and_encode_band_cost_UPAIR,
258 quantize_and_encode_band_cost_UPAIR,
259 quantize_and_encode_band_cost_UPAIR,
260 quantize_and_encode_band_cost_ESC_RTZ,
261 quantize_and_encode_band_cost_NONE, /* CB 12 doesn't exist */
262 quantize_and_encode_band_cost_NOISE,
263 quantize_and_encode_band_cost_STEREO,
264 quantize_and_encode_band_cost_STEREO,
265 };
266
267 7981016 float ff_quantize_and_encode_band_cost(struct AACEncContext *s, PutBitContext *pb,
268 const float *in, float *quant, const float *scaled,
269 int size, int scale_idx, int cb,
270 const float lambda, const float uplim,
271 int *bits, float *energy)
272 {
273 7981016 return quantize_and_encode_band_cost_arr[cb](s, pb, in, quant, scaled, size,
274 scale_idx, cb, lambda, uplim,
275 bits, energy);
276 }
277
278 444772 static inline void quantize_and_encode_band(struct AACEncContext *s, PutBitContext *pb,
279 const float *in, float *out, int size, int scale_idx,
280 int cb, const float lambda, int rtz)
281 {
282
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 444772 (rtz ? quantize_and_encode_band_cost_rtz_arr : quantize_and_encode_band_cost_arr)[cb](s, pb, in, out, NULL, size, scale_idx, cb,
283 lambda, INFINITY, NULL, NULL);
284 444772 }
285
286 /**
287 * structure used in optimal codebook search
288 */
289 typedef struct BandCodingPath {
290 int prev_idx; ///< pointer to the previous path point
291 float cost; ///< path cost
292 int run;
293 } BandCodingPath;
294
295 typedef struct TrellisPath {
296 float cost;
297 int prev;
298 } TrellisPath;
299
300 #define TRELLIS_STAGES 121
301 #define TRELLIS_STATES (SCALE_MAX_DIFF+1)
302
303 9399 static void set_special_band_scalefactors(AACEncContext *s, SingleChannelElement *sce)
304 {
305 int w, g;
306 9399 int prevscaler_n = -255, prevscaler_i = 0;
307 9399 int bands = 0;
308
309
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 19377 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
310
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 467483 for (g = 0; g < sce->ics.num_swb; g++) {
311
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 457505 if (sce->zeroes[w*16+g])
312 13402 continue;
313
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 444103 if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) {
314 8564 sce->sf_idx[w*16+g] = av_clip(roundf(log2f(sce->is_ener[w*16+g])*2), -155, 100);
315 8564 bands++;
316
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 435539 } else if (sce->band_type[w*16+g] == NOISE_BT) {
317 6375 sce->sf_idx[w*16+g] = av_clip(3+ceilf(log2f(sce->pns_ener[w*16+g])*2), -100, 155);
318
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 6375 if (prevscaler_n == -255)
319 1122 prevscaler_n = sce->sf_idx[w*16+g];
320 6375 bands++;
321 }
322 }
323 }
324
325
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 9399 if (!bands)
326 7814 return;
327
328 /* Clip the scalefactor indices */
329
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 3237 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
330
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 79450 for (g = 0; g < sce->ics.num_swb; g++) {
331
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 77798 if (sce->zeroes[w*16+g])
332 5080 continue;
333
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 72718 if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) {
334 8564 sce->sf_idx[w*16+g] = prevscaler_i = av_clip(sce->sf_idx[w*16+g], prevscaler_i - SCALE_MAX_DIFF, prevscaler_i + SCALE_MAX_DIFF);
335
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 64154 } else if (sce->band_type[w*16+g] == NOISE_BT) {
336 6375 sce->sf_idx[w*16+g] = prevscaler_n = av_clip(sce->sf_idx[w*16+g], prevscaler_n - SCALE_MAX_DIFF, prevscaler_n + SCALE_MAX_DIFF);
337 }
338 }
339 }
340 }
341
342 8660 static void search_for_quantizers_fast(AVCodecContext *avctx, AACEncContext *s,
343 SingleChannelElement *sce,
344 const float lambda)
345 {
346 8660 int start = 0, i, w, w2, g;
347 8660 int destbits = avctx->bit_rate * 1024.0 / avctx->sample_rate / avctx->ch_layout.nb_channels * (lambda / 120.f);
348 8660 float dists[128] = { 0 }, uplims[128] = { 0 };
349 float maxvals[128];
350 int fflag, minscaler;
351 8660 int its = 0;
352 8660 int allz = 0;
353 8660 float minthr = INFINITY;
354
355 // for values above this the decoder might end up in an endless loop
356 // due to always having more bits than what can be encoded.
357 8660 destbits = FFMIN(destbits, 5800);
358 //some heuristic to determine initial quantizers will reduce search time
359 //determine zero bands and upper limits
360
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 17865 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
361 9205 start = 0;
362
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 430443 for (g = 0; g < sce->ics.num_swb; g++) {
363 421238 int nz = 0;
364 421238 float uplim = 0.0f;
365
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 855622 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
366 434384 FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
367 434384 uplim += band->threshold;
368
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 434384 if (band->energy <= band->threshold || band->threshold == 0.0f) {
369 13039 sce->zeroes[(w+w2)*16+g] = 1;
370 13039 continue;
371 }
372 421345 nz = 1;
373 }
374 421238 uplims[w*16+g] = uplim *512;
375 421238 sce->band_type[w*16+g] = 0;
376 421238 sce->zeroes[w*16+g] = !nz;
377
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 421238 if (nz)
378
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 413884 minthr = FFMIN(minthr, uplim);
379 421238 allz |= nz;
380 421238 start += sce->ics.swb_sizes[g];
381 }
382 }
383
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 17865 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
384
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 430443 for (g = 0; g < sce->ics.num_swb; g++) {
385
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 421238 if (sce->zeroes[w*16+g]) {
386 7354 sce->sf_idx[w*16+g] = SCALE_ONE_POS;
387 7354 continue;
388 }
389
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 413884 sce->sf_idx[w*16+g] = SCALE_ONE_POS + FFMIN(log2f(uplims[w*16+g]/minthr)*4,59);
390 }
391 }
392
393
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 8660 if (!allz)
394 84 return;
395 8576 s->aacdsp.abs_pow34(s->scoefs, sce->coeffs, 1024);
396 8576 ff_quantize_band_cost_cache_init(s);
397
398
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 17541 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
399 8965 start = w*128;
400
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 426633 for (g = 0; g < sce->ics.num_swb; g++) {
401 417668 const float *scaled = s->scoefs + start;
402 417668 maxvals[w*16+g] = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], scaled);
403 417668 start += sce->ics.swb_sizes[g];
404 }
405 }
406
407 //perform two-loop search
408 //outer loop - improve quality
409 do {
410 int tbits, qstep;
411 36546 minscaler = sce->sf_idx[0];
412 //inner loop - quantize spectrum to fit into given number of bits
413
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 36546 qstep = its ? 1 : 32;
414 do {
415 83440 int prev = -1;
416 83440 tbits = 0;
417
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 173230 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
418 89790 start = w*128;
419
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 4140255 for (g = 0; g < sce->ics.num_swb; g++) {
420 4050465 const float *coefs = sce->coeffs + start;
421 4050465 const float *scaled = s->scoefs + start;
422 4050465 int bits = 0;
423 int cb;
424 4050465 float dist = 0.0f;
425
426
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 4050465 if (sce->zeroes[w*16+g] || sce->sf_idx[w*16+g] >= 218) {
427 55900 start += sce->ics.swb_sizes[g];
428 55900 continue;
429 }
430 3994565 minscaler = FFMIN(minscaler, sce->sf_idx[w*16+g]);
431 3994565 cb = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);
432
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 8114010 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
433 int b;
434 8238890 dist += quantize_band_cost_cached(s, w + w2, g,
435 4119445 coefs + w2*128,
436 4119445 scaled + w2*128,
437 4119445 sce->ics.swb_sizes[g],
438 4119445 sce->sf_idx[w*16+g],
439 cb, 1.0f, INFINITY,
440 &b, NULL, 0);
441 4119445 bits += b;
442 }
443 3994565 dists[w*16+g] = dist - bits;
444
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 3994565 if (prev != -1) {
445 3911125 bits += ff_aac_scalefactor_bits[sce->sf_idx[w*16+g] - prev + SCALE_DIFF_ZERO];
446 }
447 3994565 tbits += bits;
448 3994565 start += sce->ics.swb_sizes[g];
449 3994565 prev = sce->sf_idx[w*16+g];
450 }
451 }
452
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 83440 if (tbits > destbits) {
453
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 2077158 for (i = 0; i < 128; i++)
454
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 2061056 if (sce->sf_idx[i] < 218 - qstep)
455 2061056 sce->sf_idx[i] += qstep;
456 } else {
457
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 8686602 for (i = 0; i < 128; i++)
458
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 8619264 if (sce->sf_idx[i] > 60 - qstep)
459 3490494 sce->sf_idx[i] -= qstep;
460 }
461 83440 qstep >>= 1;
462
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 83440 if (!qstep && tbits > destbits*1.02 && sce->sf_idx[0] < 217)
463 4014 qstep = 1;
464
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 83440 } while (qstep);
465
466 36546 fflag = 0;
467 36546 minscaler = av_clip(minscaler, 60, 255 - SCALE_MAX_DIFF);
468
469
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 75560 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
470
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 1801205 for (g = 0; g < sce->ics.num_swb; g++) {
471 1762191 int prevsc = sce->sf_idx[w*16+g];
472
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 1762191 if (dists[w*16+g] > uplims[w*16+g] && sce->sf_idx[w*16+g] > 60) {
473
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 12632 if (find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]-1))
474 12027 sce->sf_idx[w*16+g]--;
475 else //Try to make sure there is some energy in every band
476 605 sce->sf_idx[w*16+g]-=2;
477 }
478 1762191 sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler, minscaler + SCALE_MAX_DIFF);
479 1762191 sce->sf_idx[w*16+g] = FFMIN(sce->sf_idx[w*16+g], 219);
480
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 1762191 if (sce->sf_idx[w*16+g] != prevsc)
481 510306 fflag = 1;
482 1762191 sce->band_type[w*16+g] = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);
483 }
484 }
485 36546 its++;
486
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 36546 } while (fflag && its < 10);
487 }
488
489 2003 static void search_for_pns(AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)
490 {
491 FFPsyBand *band;
492 int w, g, w2, i;
493 2003 int wlen = 1024 / sce->ics.num_windows;
494 int bandwidth, cutoff;
495 2003 float *PNS = &s->scoefs[0*128], *PNS34 = &s->scoefs[1*128];
496 2003 float *NOR34 = &s->scoefs[3*128];
497 uint8_t nextband[128];
498 2003 const float lambda = s->lambda;
499 2003 const float freq_mult = avctx->sample_rate*0.5f/wlen;
500 2003 const float thr_mult = NOISE_LAMBDA_REPLACE*(100.0f/lambda);
501
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 2003 const float spread_threshold = FFMIN(0.75f, NOISE_SPREAD_THRESHOLD*FFMAX(0.5f, lambda/100.f));
502 2003 const float dist_bias = av_clipf(4.f * 120 / lambda, 0.25f, 4.0f);
503
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 2003 const float pns_transient_energy_r = FFMIN(0.7f, lambda / 140.f);
504
505 4006 int refbits = avctx->bit_rate * 1024.0 / avctx->sample_rate
506
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 2003 / ((avctx->flags & AV_CODEC_FLAG_QSCALE) ? 2.0f : avctx->ch_layout.nb_channels)
507 2003 * (lambda / 120.f);
508
509 /** Keep this in sync with twoloop's cutoff selection */
510 2003 float rate_bandwidth_multiplier = 1.5f;
511 2003 int prev = -1000, prev_sf = -1;
512
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 2003 int frame_bit_rate = (avctx->flags & AV_CODEC_FLAG_QSCALE)
513 ✗ ? (refbits * rate_bandwidth_multiplier * avctx->sample_rate / 1024)
514 2003 : (avctx->bit_rate / avctx->ch_layout.nb_channels);
515
516 2003 frame_bit_rate *= 1.15f;
517
518
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 2003 if (avctx->cutoff > 0) {
519 832 bandwidth = avctx->cutoff;
520 } else {
521
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 1171 bandwidth = FFMAX(3000, AAC_CUTOFF_FROM_BITRATE(frame_bit_rate, 1, avctx->sample_rate));
522 }
523
524 2003 cutoff = bandwidth * 2 * wlen / avctx->sample_rate;
525
526 2003 memcpy(sce->band_alt, sce->band_type, sizeof(sce->band_type));
527 2003 ff_init_nextband_map(sce, nextband);
528
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 4134 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
529 2131 int wstart = w*128;
530
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 97078 for (g = 0; g < sce->ics.num_swb; g++) {
531 int noise_sfi;
532 94947 float dist1 = 0.0f, dist2 = 0.0f, noise_amp;
533 94947 float pns_energy = 0.0f, pns_tgt_energy, energy_ratio, dist_thresh;
534 94947 float sfb_energy = 0.0f, threshold = 0.0f, spread = 2.0f;
535 94947 float min_energy = -1.0f, max_energy = 0.0f;
536 94947 const int start = wstart+sce->ics.swb_offset[g];
537 94947 const float freq = (start-wstart)*freq_mult;
538
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 94947 const float freq_boost = FFMAX(0.88f*freq/NOISE_LOW_LIMIT, 1.0f);
539
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 94947 if (freq < NOISE_LOW_LIMIT || (start-wstart) >= cutoff) {
540
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 52710 if (!sce->zeroes[w*16+g])
541 43241 prev_sf = sce->sf_idx[w*16+g];
542 52710 continue;
543 }
544
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 85990 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
545 43753 band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
546 43753 sfb_energy += band->energy;
547
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 43753 spread = FFMIN(spread, band->spread);
548 43753 threshold += band->threshold;
549
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 43753 if (!w2) {
550 42237 min_energy = max_energy = band->energy;
551 } else {
552
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 1516 min_energy = FFMIN(min_energy, band->energy);
553
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 1516 max_energy = FFMAX(max_energy, band->energy);
554 }
555 }
556
557 /* Ramps down at ~8000Hz and loosens the dist threshold */
558 42237 dist_thresh = av_clipf(2.5f*NOISE_LOW_LIMIT/freq, 0.5f, 2.5f) * dist_bias;
559
560 /* PNS is acceptable when all of these are true:
561 * 1. high spread energy (noise-like band)
562 * 2. near-threshold energy (high PE means the random nature of PNS content will be noticed)
563 * 3. on short window groups, all windows have similar energy (variations in energy would be destroyed by PNS)
564 *
565 * At this stage, point 2 is relaxed for zeroed bands near the noise threshold (hole avoidance is more important)
566 */
567
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 42237 if ((!sce->zeroes[w*16+g] && !ff_sfdelta_can_remove_band(sce, nextband, prev_sf, w*16+g)) ||
568
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 42211 ((sce->zeroes[w*16+g] || !sce->band_alt[w*16+g]) && sfb_energy < threshold*sqrtf(1.0f/freq_boost)) || spread < spread_threshold ||
569
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 40906 (!sce->zeroes[w*16+g] && sce->band_alt[w*16+g] && sfb_energy > threshold*thr_mult*freq_boost) ||
570
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 27701 min_energy < pns_transient_energy_r * max_energy ) {
571 14606 sce->pns_ener[w*16+g] = sfb_energy;
572
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 14606 if (!sce->zeroes[w*16+g])
573 13756 prev_sf = sce->sf_idx[w*16+g];
574 14606 continue;
575 }
576
577
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 27631 pns_tgt_energy = sfb_energy*FFMIN(1.0f, spread*spread);
578 27631 noise_sfi = av_clip(roundf(log2f(pns_tgt_energy)*2), -100, 155); /* Quantize */
579 27631 noise_amp = -ff_aac_pow2sf_tab[noise_sfi + POW_SF2_ZERO]; /* Dequantize */
580
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 27631 if (prev != -1000) {
581 14932 int noise_sfdiff = noise_sfi - prev + SCALE_DIFF_ZERO;
582
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 14932 if (noise_sfdiff < 0 || noise_sfdiff > 2*SCALE_MAX_DIFF) {
583 ✗ if (!sce->zeroes[w*16+g])
584 ✗ prev_sf = sce->sf_idx[w*16+g];
585 ✗ continue;
586 }
587 }
588
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 55297 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
589 float band_energy, scale, pns_senergy;
590 27666 const int start_c = (w+w2)*128+sce->ics.swb_offset[g];
591 27666 band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
592
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 931854 for (i = 0; i < sce->ics.swb_sizes[g]; i++) {
593 904188 s->random_state = lcg_random(s->random_state);
594 904188 PNS[i] = s->random_state;
595 }
596 27666 band_energy = s->fdsp->scalarproduct_float(PNS, PNS, sce->ics.swb_sizes[g]);
597 27666 scale = noise_amp/sqrtf(band_energy);
598 27666 s->fdsp->vector_fmul_scalar(PNS, PNS, scale, sce->ics.swb_sizes[g]);
599 27666 pns_senergy = s->fdsp->scalarproduct_float(PNS, PNS, sce->ics.swb_sizes[g]);
600 27666 pns_energy += pns_senergy;
601 27666 s->aacdsp.abs_pow34(NOR34, &sce->coeffs[start_c], sce->ics.swb_sizes[g]);
602 27666 s->aacdsp.abs_pow34(PNS34, PNS, sce->ics.swb_sizes[g]);
603 55332 dist1 += quantize_band_cost(s, &sce->coeffs[start_c],
604 NOR34,
605 27666 sce->ics.swb_sizes[g],
606 27666 sce->sf_idx[(w+w2)*16+g],
607 27666 sce->band_alt[(w+w2)*16+g],
608 27666 lambda/band->threshold, INFINITY, NULL, NULL);
609 /* Estimate rd on average as 5 bits for SF, 4 for the CB, plus spread energy * lambda/thr */
610 27666 dist2 += band->energy/(band->spread*band->spread)*lambda*dist_thresh/band->threshold;
611 }
612
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 27631 if (g && sce->band_type[w*16+g-1] == NOISE_BT) {
613 5590 dist2 += 5;
614 } else {
615 22041 dist2 += 9;
616 }
617 27631 energy_ratio = pns_tgt_energy/pns_energy; /* Compensates for quantization error */
618 27631 sce->pns_ener[w*16+g] = energy_ratio*pns_tgt_energy;
619
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 27631 if (sce->zeroes[w*16+g] || !sce->band_alt[w*16+g] || (energy_ratio > 0.85f && energy_ratio < 1.25f && dist2 < dist1)) {
620 6375 sce->band_type[w*16+g] = NOISE_BT;
621 6375 sce->zeroes[w*16+g] = 0;
622 6375 prev = noise_sfi;
623 } else {
624
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 21256 if (!sce->zeroes[w*16+g])
625 21256 prev_sf = sce->sf_idx[w*16+g];
626 }
627 }
628 }
629 2003 }
630
631 2003 static void mark_pns(AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)
632 {
633 FFPsyBand *band;
634 int w, g, w2;
635 2003 int wlen = 1024 / sce->ics.num_windows;
636 int bandwidth, cutoff;
637 2003 const float lambda = s->lambda;
638 2003 const float freq_mult = avctx->sample_rate*0.5f/wlen;
639
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 2003 const float spread_threshold = FFMIN(0.75f, NOISE_SPREAD_THRESHOLD*FFMAX(0.5f, lambda/100.f));
640
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 2003 const float pns_transient_energy_r = FFMIN(0.7f, lambda / 140.f);
641
642 4006 int refbits = avctx->bit_rate * 1024.0 / avctx->sample_rate
643
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 2003 / ((avctx->flags & AV_CODEC_FLAG_QSCALE) ? 2.0f : avctx->ch_layout.nb_channels)
644 2003 * (lambda / 120.f);
645
646 /** Keep this in sync with twoloop's cutoff selection */
647 2003 float rate_bandwidth_multiplier = 1.5f;
648
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 2003 int frame_bit_rate = (avctx->flags & AV_CODEC_FLAG_QSCALE)
649 ✗ ? (refbits * rate_bandwidth_multiplier * avctx->sample_rate / 1024)
650 2003 : (avctx->bit_rate / avctx->ch_layout.nb_channels);
651
652 2003 frame_bit_rate *= 1.15f;
653
654
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 2003 if (avctx->cutoff > 0) {
655 832 bandwidth = avctx->cutoff;
656 } else {
657
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 1171 bandwidth = FFMAX(3000, AAC_CUTOFF_FROM_BITRATE(frame_bit_rate, 1, avctx->sample_rate));
658 }
659
660 2003 cutoff = bandwidth * 2 * wlen / avctx->sample_rate;
661
662 2003 memcpy(sce->band_alt, sce->band_type, sizeof(sce->band_type));
663
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 4134 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
664
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 97078 for (g = 0; g < sce->ics.num_swb; g++) {
665 94947 float sfb_energy = 0.0f, threshold = 0.0f, spread = 2.0f;
666 94947 float min_energy = -1.0f, max_energy = 0.0f;
667 94947 const int start = sce->ics.swb_offset[g];
668 94947 const float freq = start*freq_mult;
669
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 94947 const float freq_boost = FFMAX(0.88f*freq/NOISE_LOW_LIMIT, 1.0f);
670
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 94947 if (freq < NOISE_LOW_LIMIT || start >= cutoff) {
671 52710 sce->can_pns[w*16+g] = 0;
672 52710 continue;
673 }
674
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 85990 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
675 43753 band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
676 43753 sfb_energy += band->energy;
677
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 43753 spread = FFMIN(spread, band->spread);
678 43753 threshold += band->threshold;
679
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 43753 if (!w2) {
680 42237 min_energy = max_energy = band->energy;
681 } else {
682
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 1516 min_energy = FFMIN(min_energy, band->energy);
683
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 1516 max_energy = FFMAX(max_energy, band->energy);
684 }
685 }
686
687 /* PNS is acceptable when all of these are true:
688 * 1. high spread energy (noise-like band)
689 * 2. near-threshold energy (high PE means the random nature of PNS content will be noticed)
690 * 3. on short window groups, all windows have similar energy (variations in energy would be destroyed by PNS)
691 */
692 42237 sce->pns_ener[w*16+g] = sfb_energy;
693
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 42237 if (sfb_energy < threshold*sqrtf(1.5f/freq_boost) || spread < spread_threshold || min_energy < pns_transient_energy_r * max_energy) {
694 1716 sce->can_pns[w*16+g] = 0;
695 } else {
696 40521 sce->can_pns[w*16+g] = 1;
697 }
698 }
699 }
700 2003 }
701
702 630 static void search_for_ms(AACEncContext *s, ChannelElement *cpe)
703 {
704 630 int start = 0, i, w, w2, g, sid_sf_boost, prev_mid, prev_side;
705 uint8_t nextband0[128], nextband1[128];
706 630 float *M = s->scoefs + 128*0, *S = s->scoefs + 128*1;
707 630 float *L34 = s->scoefs + 128*2, *R34 = s->scoefs + 128*3;
708 630 float *M34 = s->scoefs + 128*4, *S34 = s->scoefs + 128*5;
709 630 const float lambda = s->lambda;
710
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 630 const float mslambda = FFMIN(1.0f, lambda / 120.f);
711 630 SingleChannelElement *sce0 = &cpe->ch[0];
712 630 SingleChannelElement *sce1 = &cpe->ch[1];
713
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 630 if (!cpe->common_window)
714 521 return;
715
716 /** Scout out next nonzero bands */
717 109 ff_init_nextband_map(sce0, nextband0);
718 109 ff_init_nextband_map(sce1, nextband1);
719
720 109 prev_mid = sce0->sf_idx[0];
721 109 prev_side = sce1->sf_idx[0];
722
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 232 for (w = 0; w < sce0->ics.num_windows; w += sce0->ics.group_len[w]) {
723 123 start = 0;
724
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 5485 for (g = 0; g < sce0->ics.num_swb; g++) {
725 5362 float bmax = bval2bmax(g * 17.0f / sce0->ics.num_swb) / 0.0045f;
726
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 5362 if (!cpe->is_mask[w*16+g])
727 4904 cpe->ms_mask[w*16+g] = 0;
728
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 5362 if (!sce0->zeroes[w*16+g] && !sce1->zeroes[w*16+g] && !cpe->is_mask[w*16+g]) {
729 3183 float Mmax = 0.0f, Smax = 0.0f;
730
731 /* Must compute mid/side SF and book for the whole window group */
732
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 6578 for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
733
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 70239 for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
734 66844 M[i] = (sce0->coeffs[start+(w+w2)*128+i]
735 66844 + sce1->coeffs[start+(w+w2)*128+i]) * 0.5;
736 66844 S[i] = M[i]
737 66844 - sce1->coeffs[start+(w+w2)*128+i];
738 }
739 3395 s->aacdsp.abs_pow34(M34, M, sce0->ics.swb_sizes[g]);
740 3395 s->aacdsp.abs_pow34(S34, S, sce0->ics.swb_sizes[g]);
741
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 70239 for (i = 0; i < sce0->ics.swb_sizes[g]; i++ ) {
742
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 66844 Mmax = FFMAX(Mmax, M34[i]);
743
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 66844 Smax = FFMAX(Smax, S34[i]);
744 }
745 }
746
747
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 3331 for (sid_sf_boost = 0; sid_sf_boost < 4; sid_sf_boost++) {
748 3294 float dist1 = 0.0f, dist2 = 0.0f;
749 3294 int B0 = 0, B1 = 0;
750 int minidx;
751 int mididx, sididx;
752 int midcb, sidcb;
753
754 3294 minidx = FFMIN(sce0->sf_idx[w*16+g], sce1->sf_idx[w*16+g]);
755 3294 mididx = av_clip(minidx, 0, SCALE_MAX_POS - SCALE_DIV_512);
756 3294 sididx = av_clip(minidx - sid_sf_boost * 3, 0, SCALE_MAX_POS - SCALE_DIV_512);
757
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 3294 if (sce0->band_type[w*16+g] != NOISE_BT && sce1->band_type[w*16+g] != NOISE_BT
758
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 3035 && ( !ff_sfdelta_can_replace(sce0, nextband0, prev_mid, mididx, w*16+g)
759
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 3035 || !ff_sfdelta_can_replace(sce1, nextband1, prev_side, sididx, w*16+g))) {
760 /* scalefactor range violation, bad stuff, will decrease quality unacceptably */
761 ✗ continue;
762 }
763
764 3294 midcb = find_min_book(Mmax, mididx);
765 3294 sidcb = find_min_book(Smax, sididx);
766
767 /* No CB can be zero */
768 3294 midcb = FFMAX(1,midcb);
769 3294 sidcb = FFMAX(1,sidcb);
770
771
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 6800 for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
772 3506 FFPsyBand *band0 = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g];
773 3506 FFPsyBand *band1 = &s->psy.ch[s->cur_channel+1].psy_bands[(w+w2)*16+g];
774
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 3506 float minthr = FFMIN(band0->threshold, band1->threshold);
775 int b1,b2,b3,b4;
776
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 71238 for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
777 67732 M[i] = (sce0->coeffs[start+(w+w2)*128+i]
778 67732 + sce1->coeffs[start+(w+w2)*128+i]) * 0.5;
779 67732 S[i] = M[i]
780 67732 - sce1->coeffs[start+(w+w2)*128+i];
781 }
782
783 3506 s->aacdsp.abs_pow34(L34, sce0->coeffs+start+(w+w2)*128, sce0->ics.swb_sizes[g]);
784 3506 s->aacdsp.abs_pow34(R34, sce1->coeffs+start+(w+w2)*128, sce0->ics.swb_sizes[g]);
785 3506 s->aacdsp.abs_pow34(M34, M, sce0->ics.swb_sizes[g]);
786 3506 s->aacdsp.abs_pow34(S34, S, sce0->ics.swb_sizes[g]);
787 7012 dist1 += quantize_band_cost(s, &sce0->coeffs[start + (w+w2)*128],
788 L34,
789 3506 sce0->ics.swb_sizes[g],
790 3506 sce0->sf_idx[w*16+g],
791 3506 sce0->band_type[w*16+g],
792 3506 lambda / (band0->threshold + FLT_MIN), INFINITY, &b1, NULL);
793 7012 dist1 += quantize_band_cost(s, &sce1->coeffs[start + (w+w2)*128],
794 R34,
795 3506 sce1->ics.swb_sizes[g],
796 3506 sce1->sf_idx[w*16+g],
797 3506 sce1->band_type[w*16+g],
798 3506 lambda / (band1->threshold + FLT_MIN), INFINITY, &b2, NULL);
799 7012 dist2 += quantize_band_cost(s, M,
800 M34,
801 3506 sce0->ics.swb_sizes[g],
802 mididx,
803 midcb,
804 3506 lambda / (minthr + FLT_MIN), INFINITY, &b3, NULL);
805 7012 dist2 += quantize_band_cost(s, S,
806 S34,
807 3506 sce1->ics.swb_sizes[g],
808 sididx,
809 sidcb,
810 3506 mslambda / (minthr * bmax + FLT_MIN), INFINITY, &b4, NULL);
811 3506 B0 += b1+b2;
812 3506 B1 += b3+b4;
813 3506 dist1 -= b1+b2;
814 3506 dist2 -= b3+b4;
815 }
816
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 3294 cpe->ms_mask[w*16+g] = dist2 <= dist1 && B1 < B0;
817
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 3294 if (cpe->ms_mask[w*16+g]) {
818
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 2887 if (sce0->band_type[w*16+g] != NOISE_BT && sce1->band_type[w*16+g] != NOISE_BT) {
819 2887 sce0->sf_idx[w*16+g] = mididx;
820 2887 sce1->sf_idx[w*16+g] = sididx;
821 2887 sce0->band_type[w*16+g] = midcb;
822 2887 sce1->band_type[w*16+g] = sidcb;
823 ✗ } else if ((sce0->band_type[w*16+g] != NOISE_BT) ^ (sce1->band_type[w*16+g] != NOISE_BT)) {
824 /* ms_mask unneeded, and it confuses some decoders */
825 ✗ cpe->ms_mask[w*16+g] = 0;
826 }
827 2887 break;
828
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 407 } else if (B1 > B0) {
829 /* More boost won't fix this */
830 259 break;
831 }
832 }
833 }
834
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 5362 if (!sce0->zeroes[w*16+g] && sce0->band_type[w*16+g] < RESERVED_BT)
835 3410 prev_mid = sce0->sf_idx[w*16+g];
836
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 5362 if (!sce1->zeroes[w*16+g] && !cpe->is_mask[w*16+g] && sce1->band_type[w*16+g] < RESERVED_BT)
837 2950 prev_side = sce1->sf_idx[w*16+g];
838 5362 start += sce0->ics.swb_sizes[g];
839 }
840 }
841 }
842
843 const AACCoefficientsEncoder ff_aac_coders[AAC_CODER_NB] = {
844 [AAC_CODER_TWOLOOP] = {
845 search_for_quantizers_twoloop,
846 codebook_trellis_rate,
847 quantize_and_encode_band,
848 ff_aac_encode_tns_info,
849 ff_aac_apply_tns,
850 set_special_band_scalefactors,
851 search_for_pns,
852 mark_pns,
853 ff_aac_search_for_tns,
854 search_for_ms,
855 ff_aac_search_for_is,
856 },
857 [AAC_CODER_FAST] = {
858 search_for_quantizers_fast,
859 codebook_trellis_rate,
860 quantize_and_encode_band,
861 ff_aac_encode_tns_info,
862 ff_aac_apply_tns,
863 set_special_band_scalefactors,
864 search_for_pns,
865 mark_pns,
866 ff_aac_search_for_tns,
867 search_for_ms,
868 ff_aac_search_for_is,
869 },
870 };
871