FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/aaccoder.c
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 449 647 69.4%
Branches: 337 498 67.7%
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 #include "aacenc_ltp.h"
51 #include "aacenc_pred.h"
52
53 #include "libavcodec/aaccoder_twoloop.h"
54
55 /* Parameter of f(x) = a*(lambda/100), defines the maximum fourier spread
56 * beyond which no PNS is used (since the SFBs contain tone rather than noise) */
57 #define NOISE_SPREAD_THRESHOLD 0.9f
58
59 /* Parameter of f(x) = a*(100/lambda), defines how much PNS is allowed to
60 * replace low energy non zero bands */
61 #define NOISE_LAMBDA_REPLACE 1.948f
62
63 #include "libavcodec/aaccoder_trellis.h"
64
65 typedef float (*quantize_and_encode_band_func)(struct AACEncContext *s, PutBitContext *pb,
66 const float *in, float *quant, const float *scaled,
67 int size, int scale_idx, int cb,
68 const float lambda, const float uplim,
69 int *bits, float *energy);
70
71 /**
72 * Calculate rate distortion cost for quantizing with given codebook
73 *
74 * @return quantization distortion
75 */
76 9209431 static av_always_inline float quantize_and_encode_band_cost_template(
77 struct AACEncContext *s,
78 PutBitContext *pb, const float *in, float *out,
79 const float *scaled, int size, int scale_idx,
80 int cb, const float lambda, const float uplim,
81 int *bits, float *energy, int BT_ZERO, int BT_UNSIGNED,
82 int BT_PAIR, int BT_ESC, int BT_NOISE, int BT_STEREO,
83 const float ROUNDING)
84 {
85 9209431 const int q_idx = POW_SF2_ZERO - scale_idx + SCALE_ONE_POS - SCALE_DIV_512;
86 9209431 const float Q = ff_aac_pow2sf_tab [q_idx];
87 9209431 const float Q34 = ff_aac_pow34sf_tab[q_idx];
88 9209431 const float IQ = ff_aac_pow2sf_tab [POW_SF2_ZERO + scale_idx - SCALE_ONE_POS + SCALE_DIV_512];
89 9209431 const float CLIPPED_ESCAPE = 165140.0f*IQ;
90 9209431 float cost = 0;
91 9209431 float qenergy = 0;
92
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 9209431 const int dim = BT_PAIR ? 2 : 4;
93 9209431 int resbits = 0;
94 int off;
95
96
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 9209431 if (BT_ZERO || BT_NOISE || BT_STEREO) {
97
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 38841890 for (int i = 0; i < size; i++)
98 37189524 cost += in[i]*in[i];
99
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 1652366 if (bits)
100 1628852 *bits = 0;
101
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 1652366 if (energy)
102 1596318 *energy = qenergy;
103
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 1652366 if (out) {
104 ✗ for (int i = 0; i < size; i += dim)
105 ✗ for (int j = 0; j < dim; j++)
106 ✗ out[i+j] = 0.0f;
107 }
108 1652366 return cost * lambda;
109 }
110
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 7557065 if (!scaled) {
111 469295 s->abs_pow34(s->scoefs, in, size);
112 469295 scaled = s->scoefs;
113 }
114 7557065 s->quant_bands(s->qcoefs, in, scaled, size, !BT_UNSIGNED, aac_cb_maxval[cb], Q34, ROUNDING);
115
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 7557065 if (BT_UNSIGNED) {
116 4623855 off = 0;
117 } else {
118 2933210 off = aac_cb_maxval[cb];
119 }
120
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 67342669 for (int i = 0; i < size; i += dim) {
121 const float *vec;
122 59793004 int *quants = s->qcoefs + i;
123 59793004 int curidx = 0;
124 int curbits;
125 59793004 float quantized, rd = 0.0f;
126
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 214318252 for (int j = 0; j < dim; j++) {
127 154525248 curidx *= aac_cb_range[cb];
128 154525248 curidx += quants[j] + off;
129 }
130 59793004 curbits = ff_aac_spectral_bits[cb-1][curidx];
131 59793004 vec = &ff_aac_codebook_vectors[cb-1][curidx*dim];
132
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 59793004 if (BT_UNSIGNED) {
133
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 127105465 for (int j = 0; j < dim; j++) {
134 89600198 float t = fabsf(in[i+j]);
135 float di;
136
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 89600198 if (BT_ESC && vec[j] == 64.0f) { //FIXME: slow
137
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 1618136 if (t >= CLIPPED_ESCAPE) {
138 113 quantized = CLIPPED_ESCAPE;
139 113 curbits += 21;
140 } else {
141 1618023 int c = av_clip_uintp2(quant(t, Q, ROUNDING), 13);
142 1618023 quantized = c*cbrtf(c)*IQ;
143 1618023 curbits += av_log2(c)*2 - 4 + 1;
144 }
145 } else {
146 87982062 quantized = vec[j]*IQ;
147 }
148 89600198 di = t - quantized;
149
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 89600198 if (out)
150
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 55528 out[i+j] = in[i+j] >= 0 ? quantized : -quantized;
151
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 89600198 if (vec[j] != 0.0f)
152 51625338 curbits++;
153 89600198 qenergy += quantized*quantized;
154 89600198 rd += di*di;
155 }
156 } else {
157
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 87212787 for (int j = 0; j < dim; j++) {
158 64925050 quantized = vec[j]*IQ;
159 64925050 qenergy += quantized*quantized;
160
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 64925050 if (out)
161 443504 out[i+j] = quantized;
162 64925050 rd += (in[i+j] - quantized)*(in[i+j] - quantized);
163 }
164 }
165 59793004 cost += rd * lambda + curbits;
166 59793004 resbits += curbits;
167
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 59793004 if (cost >= uplim)
168 7400 return uplim;
169
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 59785604 if (pb) {
170 3365767 put_bits(pb, ff_aac_spectral_bits[cb-1][curidx], ff_aac_spectral_codes[cb-1][curidx]);
171
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 3365767 if (BT_UNSIGNED)
172
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 6417648 for (int j = 0; j < dim; j++)
173
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 4658984 if (ff_aac_codebook_vectors[cb-1][curidx*dim+j] != 0.0f)
174 3229049 put_bits(pb, 1, in[i+j] < 0.0f);
175
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 3365767 if (BT_ESC) {
176
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177
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 909332 if (ff_aac_codebook_vectors[cb-1][curidx*2+j] == 64.0f) {
178 132912 int coef = av_clip_uintp2(quant(fabsf(in[i+j]), Q, ROUNDING), 13);
179 132912 int len = av_log2(coef);
180
181 132912 put_bits(pb, len - 4 + 1, (1 << (len - 4 + 1)) - 2);
182 132912 put_sbits(pb, len, coef);
183 }
184 }
185 }
186 }
187 }
188
189
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 7549665 if (bits)
190 6981773 *bits = resbits;
191
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 7549665 if (energy)
192 3338013 *energy = qenergy;
193 7549665 return cost;
194 }
195
196 ✗ static inline float quantize_and_encode_band_cost_NONE(struct AACEncContext *s, PutBitContext *pb,
197 const float *in, float *quant, const float *scaled,
198 int size, int scale_idx, int cb,
199 const float lambda, const float uplim,
200 int *bits, float *energy) {
201 ✗ av_assert0(0);
202 return 0.0f;
203 }
204
205 #define QUANTIZE_AND_ENCODE_BAND_COST_FUNC(NAME, BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC, BT_NOISE, BT_STEREO, ROUNDING) \
206 static float quantize_and_encode_band_cost_ ## NAME( \
207 struct AACEncContext *s, \
208 PutBitContext *pb, const float *in, float *quant, \
209 const float *scaled, int size, int scale_idx, \
210 int cb, const float lambda, const float uplim, \
211 int *bits, float *energy) { \
212 return quantize_and_encode_band_cost_template( \
213 s, pb, in, quant, scaled, size, scale_idx, \
214 BT_ESC ? ESC_BT : cb, lambda, uplim, bits, energy, \
215 BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC, BT_NOISE, BT_STEREO, \
216 ROUNDING); \
217 }
218
219 1621716 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ZERO, 1, 0, 0, 0, 0, 0, ROUND_STANDARD)
220 1699236 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SQUAD, 0, 0, 0, 0, 0, 0, ROUND_STANDARD)
221 1314687 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UQUAD, 0, 1, 0, 0, 0, 0, ROUND_STANDARD)
222 1233974 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SPAIR, 0, 0, 1, 0, 0, 0, ROUND_STANDARD)
223 2296227 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UPAIR, 0, 1, 1, 0, 0, 0, ROUND_STANDARD)
224 1007828 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ESC, 0, 1, 1, 1, 0, 0, ROUND_STANDARD)
225 5113 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ESC_RTZ, 0, 1, 1, 1, 0, 0, ROUND_TO_ZERO)
226 13300 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(NOISE, 0, 0, 0, 0, 1, 0, ROUND_STANDARD)
227 17350 QUANTIZE_AND_ENCODE_BAND_COST_FUNC(STEREO,0, 0, 0, 0, 0, 1, ROUND_STANDARD)
228
229 static const quantize_and_encode_band_func quantize_and_encode_band_cost_arr[] =
230 {
231 quantize_and_encode_band_cost_ZERO,
232 quantize_and_encode_band_cost_SQUAD,
233 quantize_and_encode_band_cost_SQUAD,
234 quantize_and_encode_band_cost_UQUAD,
235 quantize_and_encode_band_cost_UQUAD,
236 quantize_and_encode_band_cost_SPAIR,
237 quantize_and_encode_band_cost_SPAIR,
238 quantize_and_encode_band_cost_UPAIR,
239 quantize_and_encode_band_cost_UPAIR,
240 quantize_and_encode_band_cost_UPAIR,
241 quantize_and_encode_band_cost_UPAIR,
242 quantize_and_encode_band_cost_ESC,
243 quantize_and_encode_band_cost_NONE, /* CB 12 doesn't exist */
244 quantize_and_encode_band_cost_NOISE,
245 quantize_and_encode_band_cost_STEREO,
246 quantize_and_encode_band_cost_STEREO,
247 };
248
249 static const quantize_and_encode_band_func quantize_and_encode_band_cost_rtz_arr[] =
250 {
251 quantize_and_encode_band_cost_ZERO,
252 quantize_and_encode_band_cost_SQUAD,
253 quantize_and_encode_band_cost_SQUAD,
254 quantize_and_encode_band_cost_UQUAD,
255 quantize_and_encode_band_cost_UQUAD,
256 quantize_and_encode_band_cost_SPAIR,
257 quantize_and_encode_band_cost_SPAIR,
258 quantize_and_encode_band_cost_UPAIR,
259 quantize_and_encode_band_cost_UPAIR,
260 quantize_and_encode_band_cost_UPAIR,
261 quantize_and_encode_band_cost_UPAIR,
262 quantize_and_encode_band_cost_ESC_RTZ,
263 quantize_and_encode_band_cost_NONE, /* CB 12 doesn't exist */
264 quantize_and_encode_band_cost_NOISE,
265 quantize_and_encode_band_cost_STEREO,
266 quantize_and_encode_band_cost_STEREO,
267 };
268
269 8725051 float ff_quantize_and_encode_band_cost(struct AACEncContext *s, PutBitContext *pb,
270 const float *in, float *quant, const float *scaled,
271 int size, int scale_idx, int cb,
272 const float lambda, const float uplim,
273 int *bits, float *energy)
274 {
275 8725051 return quantize_and_encode_band_cost_arr[cb](s, pb, in, quant, scaled, size,
276 scale_idx, cb, lambda, uplim,
277 bits, energy);
278 }
279
280 484380 static inline void quantize_and_encode_band(struct AACEncContext *s, PutBitContext *pb,
281 const float *in, float *out, int size, int scale_idx,
282 int cb, const float lambda, int rtz)
283 {
284
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 484380 (rtz ? quantize_and_encode_band_cost_rtz_arr : quantize_and_encode_band_cost_arr)[cb](s, pb, in, out, NULL, size, scale_idx, cb,
285 lambda, INFINITY, NULL, NULL);
286 484380 }
287
288 /**
289 * structure used in optimal codebook search
290 */
291 typedef struct BandCodingPath {
292 int prev_idx; ///< pointer to the previous path point
293 float cost; ///< path cost
294 int run;
295 } BandCodingPath;
296
297 /**
298 * Encode band info for single window group bands.
299 */
300 ✗ static void encode_window_bands_info(AACEncContext *s, SingleChannelElement *sce,
301 int win, int group_len, const float lambda)
302 {
303 BandCodingPath path[120][CB_TOT_ALL];
304 int w, swb, cb, start, size;
305 int i, j;
306 ✗ const int max_sfb = sce->ics.max_sfb;
307 ✗ const int run_bits = sce->ics.num_windows == 1 ? 5 : 3;
308 ✗ const int run_esc = (1 << run_bits) - 1;
309 int idx, ppos, count;
310 int stackrun[120], stackcb[120], stack_len;
311 ✗ float next_minrd = INFINITY;
312 ✗ int next_mincb = 0;
313
314 ✗ s->abs_pow34(s->scoefs, sce->coeffs, 1024);
315 ✗ start = win*128;
316 ✗ for (cb = 0; cb < CB_TOT_ALL; cb++) {
317 ✗ path[0][cb].cost = 0.0f;
318 ✗ path[0][cb].prev_idx = -1;
319 ✗ path[0][cb].run = 0;
320 }
321 ✗ for (swb = 0; swb < max_sfb; swb++) {
322 ✗ size = sce->ics.swb_sizes[swb];
323 ✗ if (sce->zeroes[win*16 + swb]) {
324 ✗ for (cb = 0; cb < CB_TOT_ALL; cb++) {
325 ✗ path[swb+1][cb].prev_idx = cb;
326 ✗ path[swb+1][cb].cost = path[swb][cb].cost;
327 ✗ path[swb+1][cb].run = path[swb][cb].run + 1;
328 }
329 } else {
330 ✗ float minrd = next_minrd;
331 ✗ int mincb = next_mincb;
332 ✗ next_minrd = INFINITY;
333 ✗ next_mincb = 0;
334 ✗ for (cb = 0; cb < CB_TOT_ALL; cb++) {
335 float cost_stay_here, cost_get_here;
336 ✗ float rd = 0.0f;
337 ✗ if (cb >= 12 && sce->band_type[win*16+swb] < aac_cb_out_map[cb] ||
338 ✗ cb < aac_cb_in_map[sce->band_type[win*16+swb]] && sce->band_type[win*16+swb] > aac_cb_out_map[cb]) {
339 ✗ path[swb+1][cb].prev_idx = -1;
340 ✗ path[swb+1][cb].cost = INFINITY;
341 ✗ path[swb+1][cb].run = path[swb][cb].run + 1;
342 ✗ continue;
343 }
344 ✗ for (w = 0; w < group_len; w++) {
345 ✗ FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(win+w)*16+swb];
346 ✗ rd += quantize_band_cost(s, &sce->coeffs[start + w*128],
347 ✗ &s->scoefs[start + w*128], size,
348 ✗ sce->sf_idx[(win+w)*16+swb], aac_cb_out_map[cb],
349 ✗ lambda / band->threshold, INFINITY, NULL, NULL);
350 }
351 ✗ cost_stay_here = path[swb][cb].cost + rd;
352 ✗ cost_get_here = minrd + rd + run_bits + 4;
353 ✗ if ( run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run]
354 ✗ != run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run+1])
355 ✗ cost_stay_here += run_bits;
356 ✗ if (cost_get_here < cost_stay_here) {
357 ✗ path[swb+1][cb].prev_idx = mincb;
358 ✗ path[swb+1][cb].cost = cost_get_here;
359 ✗ path[swb+1][cb].run = 1;
360 } else {
361 ✗ path[swb+1][cb].prev_idx = cb;
362 ✗ path[swb+1][cb].cost = cost_stay_here;
363 ✗ path[swb+1][cb].run = path[swb][cb].run + 1;
364 }
365 ✗ if (path[swb+1][cb].cost < next_minrd) {
366 ✗ next_minrd = path[swb+1][cb].cost;
367 ✗ next_mincb = cb;
368 }
369 }
370 }
371 ✗ start += sce->ics.swb_sizes[swb];
372 }
373
374 //convert resulting path from backward-linked list
375 ✗ stack_len = 0;
376 ✗ idx = 0;
377 ✗ for (cb = 1; cb < CB_TOT_ALL; cb++)
378 ✗ if (path[max_sfb][cb].cost < path[max_sfb][idx].cost)
379 ✗ idx = cb;
380 ✗ ppos = max_sfb;
381 ✗ while (ppos > 0) {
382 av_assert1(idx >= 0);
383 ✗ cb = idx;
384 ✗ stackrun[stack_len] = path[ppos][cb].run;
385 ✗ stackcb [stack_len] = cb;
386 ✗ idx = path[ppos-path[ppos][cb].run+1][cb].prev_idx;
387 ✗ ppos -= path[ppos][cb].run;
388 ✗ stack_len++;
389 }
390 //perform actual band info encoding
391 ✗ start = 0;
392 ✗ for (i = stack_len - 1; i >= 0; i--) {
393 ✗ cb = aac_cb_out_map[stackcb[i]];
394 ✗ put_bits(&s->pb, 4, cb);
395 ✗ count = stackrun[i];
396 ✗ memset(sce->zeroes + win*16 + start, !cb, count);
397 //XXX: memset when band_type is also uint8_t
398 ✗ for (j = 0; j < count; j++) {
399 ✗ sce->band_type[win*16 + start] = cb;
400 ✗ start++;
401 }
402 ✗ while (count >= run_esc) {
403 ✗ put_bits(&s->pb, run_bits, run_esc);
404 ✗ count -= run_esc;
405 }
406 ✗ put_bits(&s->pb, run_bits, count);
407 }
408 }
409
410
411 typedef struct TrellisPath {
412 float cost;
413 int prev;
414 } TrellisPath;
415
416 #define TRELLIS_STAGES 121
417 #define TRELLIS_STATES (SCALE_MAX_DIFF+1)
418
419 10231 static void set_special_band_scalefactors(AACEncContext *s, SingleChannelElement *sce)
420 {
421 int w, g;
422 10231 int prevscaler_n = -255, prevscaler_i = 0;
423 10231 int bands = 0;
424
425
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 21114 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
426
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 509163 for (g = 0; g < sce->ics.num_swb; g++) {
427
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 498280 if (sce->zeroes[w*16+g])
428 13935 continue;
429
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 484345 if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) {
430 8564 sce->sf_idx[w*16+g] = av_clip(roundf(log2f(sce->is_ener[w*16+g])*2), -155, 100);
431 8564 bands++;
432
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 475781 } else if (sce->band_type[w*16+g] == NOISE_BT) {
433 6375 sce->sf_idx[w*16+g] = av_clip(3+ceilf(log2f(sce->pns_ener[w*16+g])*2), -100, 155);
434
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 6375 if (prevscaler_n == -255)
435 1122 prevscaler_n = sce->sf_idx[w*16+g];
436 6375 bands++;
437 }
438 }
439 }
440
441
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 10231 if (!bands)
442 8646 return;
443
444 /* Clip the scalefactor indices */
445
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 3237 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
446
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 79450 for (g = 0; g < sce->ics.num_swb; g++) {
447
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 77798 if (sce->zeroes[w*16+g])
448 5080 continue;
449
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 72718 if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) {
450 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);
451
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 64154 } else if (sce->band_type[w*16+g] == NOISE_BT) {
452 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);
453 }
454 }
455 }
456 }
457
458 ✗ static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s,
459 SingleChannelElement *sce,
460 const float lambda)
461 {
462 ✗ int q, w, w2, g, start = 0;
463 int i, j;
464 int idx;
465 TrellisPath paths[TRELLIS_STAGES][TRELLIS_STATES];
466 int bandaddr[TRELLIS_STAGES];
467 int minq;
468 float mincost;
469 ✗ float q0f = FLT_MAX, q1f = 0.0f, qnrgf = 0.0f;
470 ✗ int q0, q1, qcnt = 0;
471
472 ✗ for (i = 0; i < 1024; i++) {
473 ✗ float t = fabsf(sce->coeffs[i]);
474 ✗ if (t > 0.0f) {
475 ✗ q0f = FFMIN(q0f, t);
476 ✗ q1f = FFMAX(q1f, t);
477 ✗ qnrgf += t*t;
478 ✗ qcnt++;
479 }
480 }
481
482 ✗ if (!qcnt) {
483 ✗ memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
484 ✗ memset(sce->zeroes, 1, sizeof(sce->zeroes));
485 ✗ return;
486 }
487
488 //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
489 ✗ q0 = av_clip(coef2minsf(q0f), 0, SCALE_MAX_POS-1);
490 //maximum scalefactor index is when maximum coefficient after quantizing is still not zero
491 ✗ q1 = av_clip(coef2maxsf(q1f), 1, SCALE_MAX_POS);
492 ✗ if (q1 - q0 > 60) {
493 ✗ int q0low = q0;
494 ✗ int q1high = q1;
495 //minimum scalefactor index is when maximum nonzero coefficient after quantizing is not clipped
496 ✗ int qnrg = av_clip_uint8(log2f(sqrtf(qnrgf/qcnt))*4 - 31 + SCALE_ONE_POS - SCALE_DIV_512);
497 ✗ q1 = qnrg + 30;
498 ✗ q0 = qnrg - 30;
499 ✗ if (q0 < q0low) {
500 ✗ q1 += q0low - q0;
501 ✗ q0 = q0low;
502 ✗ } else if (q1 > q1high) {
503 ✗ q0 -= q1 - q1high;
504 ✗ q1 = q1high;
505 }
506 }
507 // q0 == q1 isn't really a legal situation
508 ✗ if (q0 == q1) {
509 // the following is indirect but guarantees q1 != q0 && q1 near q0
510 ✗ q1 = av_clip(q0+1, 1, SCALE_MAX_POS);
511 ✗ q0 = av_clip(q1-1, 0, SCALE_MAX_POS - 1);
512 }
513
514 ✗ for (i = 0; i < TRELLIS_STATES; i++) {
515 ✗ paths[0][i].cost = 0.0f;
516 ✗ paths[0][i].prev = -1;
517 }
518 ✗ for (j = 1; j < TRELLIS_STAGES; j++) {
519 ✗ for (i = 0; i < TRELLIS_STATES; i++) {
520 ✗ paths[j][i].cost = INFINITY;
521 ✗ paths[j][i].prev = -2;
522 }
523 }
524 ✗ idx = 1;
525 ✗ s->abs_pow34(s->scoefs, sce->coeffs, 1024);
526 ✗ for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
527 ✗ start = w*128;
528 ✗ for (g = 0; g < sce->ics.num_swb; g++) {
529 ✗ const float *coefs = &sce->coeffs[start];
530 float qmin, qmax;
531 ✗ int nz = 0;
532
533 ✗ bandaddr[idx] = w * 16 + g;
534 ✗ qmin = INT_MAX;
535 ✗ qmax = 0.0f;
536 ✗ for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
537 ✗ FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
538 ✗ if (band->energy <= band->threshold || band->threshold == 0.0f) {
539 ✗ sce->zeroes[(w+w2)*16+g] = 1;
540 ✗ continue;
541 }
542 ✗ sce->zeroes[(w+w2)*16+g] = 0;
543 ✗ nz = 1;
544 ✗ for (i = 0; i < sce->ics.swb_sizes[g]; i++) {
545 ✗ float t = fabsf(coefs[w2*128+i]);
546 ✗ if (t > 0.0f)
547 ✗ qmin = FFMIN(qmin, t);
548 ✗ qmax = FFMAX(qmax, t);
549 }
550 }
551 ✗ if (nz) {
552 int minscale, maxscale;
553 ✗ float minrd = INFINITY;
554 float maxval;
555 //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
556 ✗ minscale = coef2minsf(qmin);
557 //maximum scalefactor index is when maximum coefficient after quantizing is still not zero
558 ✗ maxscale = coef2maxsf(qmax);
559 ✗ minscale = av_clip(minscale - q0, 0, TRELLIS_STATES - 1);
560 ✗ maxscale = av_clip(maxscale - q0, 0, TRELLIS_STATES);
561 ✗ if (minscale == maxscale) {
562 ✗ maxscale = av_clip(minscale+1, 1, TRELLIS_STATES);
563 ✗ minscale = av_clip(maxscale-1, 0, TRELLIS_STATES - 1);
564 }
565 ✗ maxval = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], s->scoefs+start);
566 ✗ for (q = minscale; q < maxscale; q++) {
567 ✗ float dist = 0;
568 ✗ int cb = find_min_book(maxval, sce->sf_idx[w*16+g]);
569 ✗ for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
570 ✗ FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
571 ✗ dist += quantize_band_cost(s, coefs + w2*128, s->scoefs + start + w2*128, sce->ics.swb_sizes[g],
572 ✗ q + q0, cb, lambda / band->threshold, INFINITY, NULL, NULL);
573 }
574 ✗ minrd = FFMIN(minrd, dist);
575
576 ✗ for (i = 0; i < q1 - q0; i++) {
577 float cost;
578 ✗ cost = paths[idx - 1][i].cost + dist
579 ✗ + ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO];
580 ✗ if (cost < paths[idx][q].cost) {
581 ✗ paths[idx][q].cost = cost;
582 ✗ paths[idx][q].prev = i;
583 }
584 }
585 }
586 } else {
587 ✗ for (q = 0; q < q1 - q0; q++) {
588 ✗ paths[idx][q].cost = paths[idx - 1][q].cost + 1;
589 ✗ paths[idx][q].prev = q;
590 }
591 }
592 ✗ sce->zeroes[w*16+g] = !nz;
593 ✗ start += sce->ics.swb_sizes[g];
594 ✗ idx++;
595 }
596 }
597 ✗ idx--;
598 ✗ mincost = paths[idx][0].cost;
599 ✗ minq = 0;
600 ✗ for (i = 1; i < TRELLIS_STATES; i++) {
601 ✗ if (paths[idx][i].cost < mincost) {
602 ✗ mincost = paths[idx][i].cost;
603 ✗ minq = i;
604 }
605 }
606 ✗ while (idx) {
607 ✗ sce->sf_idx[bandaddr[idx]] = minq + q0;
608 ✗ minq = FFMAX(paths[idx][minq].prev, 0);
609 ✗ idx--;
610 }
611 //set the same quantizers inside window groups
612 ✗ for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
613 ✗ for (g = 0; g < sce->ics.num_swb; g++)
614 ✗ for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
615 ✗ sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
616 }
617
618 9492 static void search_for_quantizers_fast(AVCodecContext *avctx, AACEncContext *s,
619 SingleChannelElement *sce,
620 const float lambda)
621 {
622 9492 int start = 0, i, w, w2, g;
623 9492 int destbits = avctx->bit_rate * 1024.0 / avctx->sample_rate / avctx->ch_layout.nb_channels * (lambda / 120.f);
624 9492 float dists[128] = { 0 }, uplims[128] = { 0 };
625 float maxvals[128];
626 int fflag, minscaler;
627 9492 int its = 0;
628 9492 int allz = 0;
629 9492 float minthr = INFINITY;
630
631 // for values above this the decoder might end up in an endless loop
632 // due to always having more bits than what can be encoded.
633 9492 destbits = FFMIN(destbits, 5800);
634 //some heuristic to determine initial quantizers will reduce search time
635 //determine zero bands and upper limits
636
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 19602 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
637 10110 start = 0;
638
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 472123 for (g = 0; g < sce->ics.num_swb; g++) {
639 462013 int nz = 0;
640 462013 float uplim = 0.0f;
641
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 938992 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
642 476979 FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
643 476979 uplim += band->threshold;
644
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 476979 if (band->energy <= band->threshold || band->threshold == 0.0f) {
645 14440 sce->zeroes[(w+w2)*16+g] = 1;
646 14440 continue;
647 }
648 462539 nz = 1;
649 }
650 462013 uplims[w*16+g] = uplim *512;
651 462013 sce->band_type[w*16+g] = 0;
652 462013 sce->zeroes[w*16+g] = !nz;
653
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 462013 if (nz)
654
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 454126 minthr = FFMIN(minthr, uplim);
655 462013 allz |= nz;
656 462013 start += sce->ics.swb_sizes[g];
657 }
658 }
659
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 19602 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
660
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 472123 for (g = 0; g < sce->ics.num_swb; g++) {
661
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 462013 if (sce->zeroes[w*16+g]) {
662 7887 sce->sf_idx[w*16+g] = SCALE_ONE_POS;
663 7887 continue;
664 }
665
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 454126 sce->sf_idx[w*16+g] = SCALE_ONE_POS + FFMIN(log2f(uplims[w*16+g]/minthr)*4,59);
666 }
667 }
668
669
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 9492 if (!allz)
670 96 return;
671 9396 s->abs_pow34(s->scoefs, sce->coeffs, 1024);
672 9396 ff_quantize_band_cost_cache_init(s);
673
674
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 19230 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
675 9834 start = w*128;
676
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 467773 for (g = 0; g < sce->ics.num_swb; g++) {
677 457939 const float *scaled = s->scoefs + start;
678 457939 maxvals[w*16+g] = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], scaled);
679 457939 start += sce->ics.swb_sizes[g];
680 }
681 }
682
683 //perform two-loop search
684 //outer loop - improve quality
685 do {
686 int tbits, qstep;
687 37496 minscaler = sce->sf_idx[0];
688 //inner loop - quantize spectrum to fit into given number of bits
689
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 37496 qstep = its ? 1 : 32;
690 do {
691 89205 int prev = -1;
692 89205 tbits = 0;
693
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 185856 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
694 96651 start = w*128;
695
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 4431470 for (g = 0; g < sce->ics.num_swb; g++) {
696 4334819 const float *coefs = sce->coeffs + start;
697 4334819 const float *scaled = s->scoefs + start;
698 4334819 int bits = 0;
699 int cb;
700 4334819 float dist = 0.0f;
701
702
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 4334819 if (sce->zeroes[w*16+g] || sce->sf_idx[w*16+g] >= 218) {
703 56203 start += sce->ics.swb_sizes[g];
704 56203 continue;
705 }
706 4278616 minscaler = FFMIN(minscaler, sce->sf_idx[w*16+g]);
707 4278616 cb = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);
708
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 8704204 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
709 int b;
710 8851176 dist += quantize_band_cost_cached(s, w + w2, g,
711 4425588 coefs + w2*128,
712 4425588 scaled + w2*128,
713 4425588 sce->ics.swb_sizes[g],
714 4425588 sce->sf_idx[w*16+g],
715 cb, 1.0f, INFINITY,
716 &b, NULL, 0);
717 4425588 bits += b;
718 }
719 4278616 dists[w*16+g] = dist - bits;
720
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 4278616 if (prev != -1) {
721 4189411 bits += ff_aac_scalefactor_bits[sce->sf_idx[w*16+g] - prev + SCALE_DIFF_ZERO];
722 }
723 4278616 tbits += bits;
724 4278616 start += sce->ics.swb_sizes[g];
725 4278616 prev = sce->sf_idx[w*16+g];
726 }
727 }
728
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 89205 if (tbits > destbits) {
729
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 2406624 for (i = 0; i < 128; i++)
730
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 2387968 if (sce->sf_idx[i] < 218 - qstep)
731 2387968 sce->sf_idx[i] += qstep;
732 } else {
733
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 9100821 for (i = 0; i < 128; i++)
734
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 9030272 if (sce->sf_idx[i] > 60 - qstep)
735 3687483 sce->sf_idx[i] -= qstep;
736 }
737 89205 qstep >>= 1;
738
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 89205 if (!qstep && tbits > destbits*1.02 && sce->sf_idx[0] < 217)
739 4729 qstep = 1;
740
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 89205 } while (qstep);
741
742 37496 fflag = 0;
743 37496 minscaler = av_clip(minscaler, 60, 255 - SCALE_MAX_DIFF);
744
745
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 77851 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
746
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 1849775 for (g = 0; g < sce->ics.num_swb; g++) {
747 1809420 int prevsc = sce->sf_idx[w*16+g];
748
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 1809420 if (dists[w*16+g] > uplims[w*16+g] && sce->sf_idx[w*16+g] > 60) {
749
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 15594 if (find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]-1))
750 14882 sce->sf_idx[w*16+g]--;
751 else //Try to make sure there is some energy in every band
752 712 sce->sf_idx[w*16+g]-=2;
753 }
754 1809420 sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler, minscaler + SCALE_MAX_DIFF);
755 1809420 sce->sf_idx[w*16+g] = FFMIN(sce->sf_idx[w*16+g], 219);
756
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 1809420 if (sce->sf_idx[w*16+g] != prevsc)
757 513325 fflag = 1;
758 1809420 sce->band_type[w*16+g] = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);
759 }
760 }
761 37496 its++;
762
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 37496 } while (fflag && its < 10);
763 }
764
765 2003 static void search_for_pns(AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)
766 {
767 FFPsyBand *band;
768 int w, g, w2, i;
769 2003 int wlen = 1024 / sce->ics.num_windows;
770 int bandwidth, cutoff;
771 2003 float *PNS = &s->scoefs[0*128], *PNS34 = &s->scoefs[1*128];
772 2003 float *NOR34 = &s->scoefs[3*128];
773 uint8_t nextband[128];
774 2003 const float lambda = s->lambda;
775 2003 const float freq_mult = avctx->sample_rate*0.5f/wlen;
776 2003 const float thr_mult = NOISE_LAMBDA_REPLACE*(100.0f/lambda);
777
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 2003 const float spread_threshold = FFMIN(0.75f, NOISE_SPREAD_THRESHOLD*FFMAX(0.5f, lambda/100.f));
778 2003 const float dist_bias = av_clipf(4.f * 120 / lambda, 0.25f, 4.0f);
779
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 2003 const float pns_transient_energy_r = FFMIN(0.7f, lambda / 140.f);
780
781 4006 int refbits = avctx->bit_rate * 1024.0 / avctx->sample_rate
782
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 2003 / ((avctx->flags & AV_CODEC_FLAG_QSCALE) ? 2.0f : avctx->ch_layout.nb_channels)
783 2003 * (lambda / 120.f);
784
785 /** Keep this in sync with twoloop's cutoff selection */
786 2003 float rate_bandwidth_multiplier = 1.5f;
787 2003 int prev = -1000, prev_sf = -1;
788
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 2003 int frame_bit_rate = (avctx->flags & AV_CODEC_FLAG_QSCALE)
789 ✗ ? (refbits * rate_bandwidth_multiplier * avctx->sample_rate / 1024)
790 2003 : (avctx->bit_rate / avctx->ch_layout.nb_channels);
791
792 2003 frame_bit_rate *= 1.15f;
793
794
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 2003 if (avctx->cutoff > 0) {
795 832 bandwidth = avctx->cutoff;
796 } else {
797
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 1171 bandwidth = FFMAX(3000, AAC_CUTOFF_FROM_BITRATE(frame_bit_rate, 1, avctx->sample_rate));
798 }
799
800 2003 cutoff = bandwidth * 2 * wlen / avctx->sample_rate;
801
802 2003 memcpy(sce->band_alt, sce->band_type, sizeof(sce->band_type));
803 2003 ff_init_nextband_map(sce, nextband);
804
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 4134 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
805 2131 int wstart = w*128;
806
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 97078 for (g = 0; g < sce->ics.num_swb; g++) {
807 int noise_sfi;
808 94947 float dist1 = 0.0f, dist2 = 0.0f, noise_amp;
809 94947 float pns_energy = 0.0f, pns_tgt_energy, energy_ratio, dist_thresh;
810 94947 float sfb_energy = 0.0f, threshold = 0.0f, spread = 2.0f;
811 94947 float min_energy = -1.0f, max_energy = 0.0f;
812 94947 const int start = wstart+sce->ics.swb_offset[g];
813 94947 const float freq = (start-wstart)*freq_mult;
814
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 94947 const float freq_boost = FFMAX(0.88f*freq/NOISE_LOW_LIMIT, 1.0f);
815
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 94947 if (freq < NOISE_LOW_LIMIT || (start-wstart) >= cutoff) {
816
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 52710 if (!sce->zeroes[w*16+g])
817 43241 prev_sf = sce->sf_idx[w*16+g];
818 52710 continue;
819 }
820
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 85990 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
821 43753 band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
822 43753 sfb_energy += band->energy;
823
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 43753 spread = FFMIN(spread, band->spread);
824 43753 threshold += band->threshold;
825
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 43753 if (!w2) {
826 42237 min_energy = max_energy = band->energy;
827 } else {
828
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 1516 min_energy = FFMIN(min_energy, band->energy);
829
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 1516 max_energy = FFMAX(max_energy, band->energy);
830 }
831 }
832
833 /* Ramps down at ~8000Hz and loosens the dist threshold */
834 42237 dist_thresh = av_clipf(2.5f*NOISE_LOW_LIMIT/freq, 0.5f, 2.5f) * dist_bias;
835
836 /* PNS is acceptable when all of these are true:
837 * 1. high spread energy (noise-like band)
838 * 2. near-threshold energy (high PE means the random nature of PNS content will be noticed)
839 * 3. on short window groups, all windows have similar energy (variations in energy would be destroyed by PNS)
840 *
841 * At this stage, point 2 is relaxed for zeroed bands near the noise threshold (hole avoidance is more important)
842 */
843
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 42237 if ((!sce->zeroes[w*16+g] && !ff_sfdelta_can_remove_band(sce, nextband, prev_sf, w*16+g)) ||
844
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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 ||
845
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 40906 (!sce->zeroes[w*16+g] && sce->band_alt[w*16+g] && sfb_energy > threshold*thr_mult*freq_boost) ||
846
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 27701 min_energy < pns_transient_energy_r * max_energy ) {
847 14606 sce->pns_ener[w*16+g] = sfb_energy;
848
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 14606 if (!sce->zeroes[w*16+g])
849 13756 prev_sf = sce->sf_idx[w*16+g];
850 14606 continue;
851 }
852
853
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 27631 pns_tgt_energy = sfb_energy*FFMIN(1.0f, spread*spread);
854 27631 noise_sfi = av_clip(roundf(log2f(pns_tgt_energy)*2), -100, 155); /* Quantize */
855 27631 noise_amp = -ff_aac_pow2sf_tab[noise_sfi + POW_SF2_ZERO]; /* Dequantize */
856
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 27631 if (prev != -1000) {
857 14932 int noise_sfdiff = noise_sfi - prev + SCALE_DIFF_ZERO;
858
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 14932 if (noise_sfdiff < 0 || noise_sfdiff > 2*SCALE_MAX_DIFF) {
859 ✗ if (!sce->zeroes[w*16+g])
860 ✗ prev_sf = sce->sf_idx[w*16+g];
861 ✗ continue;
862 }
863 }
864
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 55297 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
865 float band_energy, scale, pns_senergy;
866 27666 const int start_c = (w+w2)*128+sce->ics.swb_offset[g];
867 27666 band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
868
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 931854 for (i = 0; i < sce->ics.swb_sizes[g]; i++) {
869 904188 s->random_state = lcg_random(s->random_state);
870 904188 PNS[i] = s->random_state;
871 }
872 27666 band_energy = s->fdsp->scalarproduct_float(PNS, PNS, sce->ics.swb_sizes[g]);
873 27666 scale = noise_amp/sqrtf(band_energy);
874 27666 s->fdsp->vector_fmul_scalar(PNS, PNS, scale, sce->ics.swb_sizes[g]);
875 27666 pns_senergy = s->fdsp->scalarproduct_float(PNS, PNS, sce->ics.swb_sizes[g]);
876 27666 pns_energy += pns_senergy;
877 27666 s->abs_pow34(NOR34, &sce->coeffs[start_c], sce->ics.swb_sizes[g]);
878 27666 s->abs_pow34(PNS34, PNS, sce->ics.swb_sizes[g]);
879 55332 dist1 += quantize_band_cost(s, &sce->coeffs[start_c],
880 NOR34,
881 27666 sce->ics.swb_sizes[g],
882 27666 sce->sf_idx[(w+w2)*16+g],
883 27666 sce->band_alt[(w+w2)*16+g],
884 27666 lambda/band->threshold, INFINITY, NULL, NULL);
885 /* Estimate rd on average as 5 bits for SF, 4 for the CB, plus spread energy * lambda/thr */
886 27666 dist2 += band->energy/(band->spread*band->spread)*lambda*dist_thresh/band->threshold;
887 }
888
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 27631 if (g && sce->band_type[w*16+g-1] == NOISE_BT) {
889 5590 dist2 += 5;
890 } else {
891 22041 dist2 += 9;
892 }
893 27631 energy_ratio = pns_tgt_energy/pns_energy; /* Compensates for quantization error */
894 27631 sce->pns_ener[w*16+g] = energy_ratio*pns_tgt_energy;
895
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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)) {
896 6375 sce->band_type[w*16+g] = NOISE_BT;
897 6375 sce->zeroes[w*16+g] = 0;
898 6375 prev = noise_sfi;
899 } else {
900
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 21256 if (!sce->zeroes[w*16+g])
901 21256 prev_sf = sce->sf_idx[w*16+g];
902 }
903 }
904 }
905 2003 }
906
907 2003 static void mark_pns(AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)
908 {
909 FFPsyBand *band;
910 int w, g, w2;
911 2003 int wlen = 1024 / sce->ics.num_windows;
912 int bandwidth, cutoff;
913 2003 const float lambda = s->lambda;
914 2003 const float freq_mult = avctx->sample_rate*0.5f/wlen;
915
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 2003 const float spread_threshold = FFMIN(0.75f, NOISE_SPREAD_THRESHOLD*FFMAX(0.5f, lambda/100.f));
916
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 2003 const float pns_transient_energy_r = FFMIN(0.7f, lambda / 140.f);
917
918 4006 int refbits = avctx->bit_rate * 1024.0 / avctx->sample_rate
919
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 2003 / ((avctx->flags & AV_CODEC_FLAG_QSCALE) ? 2.0f : avctx->ch_layout.nb_channels)
920 2003 * (lambda / 120.f);
921
922 /** Keep this in sync with twoloop's cutoff selection */
923 2003 float rate_bandwidth_multiplier = 1.5f;
924
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 2003 int frame_bit_rate = (avctx->flags & AV_CODEC_FLAG_QSCALE)
925 ✗ ? (refbits * rate_bandwidth_multiplier * avctx->sample_rate / 1024)
926 2003 : (avctx->bit_rate / avctx->ch_layout.nb_channels);
927
928 2003 frame_bit_rate *= 1.15f;
929
930
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 2003 if (avctx->cutoff > 0) {
931 832 bandwidth = avctx->cutoff;
932 } else {
933
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 1171 bandwidth = FFMAX(3000, AAC_CUTOFF_FROM_BITRATE(frame_bit_rate, 1, avctx->sample_rate));
934 }
935
936 2003 cutoff = bandwidth * 2 * wlen / avctx->sample_rate;
937
938 2003 memcpy(sce->band_alt, sce->band_type, sizeof(sce->band_type));
939
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 4134 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
940
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 97078 for (g = 0; g < sce->ics.num_swb; g++) {
941 94947 float sfb_energy = 0.0f, threshold = 0.0f, spread = 2.0f;
942 94947 float min_energy = -1.0f, max_energy = 0.0f;
943 94947 const int start = sce->ics.swb_offset[g];
944 94947 const float freq = start*freq_mult;
945
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 94947 const float freq_boost = FFMAX(0.88f*freq/NOISE_LOW_LIMIT, 1.0f);
946
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 94947 if (freq < NOISE_LOW_LIMIT || start >= cutoff) {
947 52710 sce->can_pns[w*16+g] = 0;
948 52710 continue;
949 }
950
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 85990 for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
951 43753 band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
952 43753 sfb_energy += band->energy;
953
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 43753 spread = FFMIN(spread, band->spread);
954 43753 threshold += band->threshold;
955
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 43753 if (!w2) {
956 42237 min_energy = max_energy = band->energy;
957 } else {
958
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 1516 min_energy = FFMIN(min_energy, band->energy);
959
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 1516 max_energy = FFMAX(max_energy, band->energy);
960 }
961 }
962
963 /* PNS is acceptable when all of these are true:
964 * 1. high spread energy (noise-like band)
965 * 2. near-threshold energy (high PE means the random nature of PNS content will be noticed)
966 * 3. on short window groups, all windows have similar energy (variations in energy would be destroyed by PNS)
967 */
968 42237 sce->pns_ener[w*16+g] = sfb_energy;
969
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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) {
970 1716 sce->can_pns[w*16+g] = 0;
971 } else {
972 40521 sce->can_pns[w*16+g] = 1;
973 }
974 }
975 }
976 2003 }
977
978 630 static void search_for_ms(AACEncContext *s, ChannelElement *cpe)
979 {
980 630 int start = 0, i, w, w2, g, sid_sf_boost, prev_mid, prev_side;
981 uint8_t nextband0[128], nextband1[128];
982 630 float *M = s->scoefs + 128*0, *S = s->scoefs + 128*1;
983 630 float *L34 = s->scoefs + 128*2, *R34 = s->scoefs + 128*3;
984 630 float *M34 = s->scoefs + 128*4, *S34 = s->scoefs + 128*5;
985 630 const float lambda = s->lambda;
986
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 630 const float mslambda = FFMIN(1.0f, lambda / 120.f);
987 630 SingleChannelElement *sce0 = &cpe->ch[0];
988 630 SingleChannelElement *sce1 = &cpe->ch[1];
989
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 630 if (!cpe->common_window)
990 521 return;
991
992 /** Scout out next nonzero bands */
993 109 ff_init_nextband_map(sce0, nextband0);
994 109 ff_init_nextband_map(sce1, nextband1);
995
996 109 prev_mid = sce0->sf_idx[0];
997 109 prev_side = sce1->sf_idx[0];
998
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 232 for (w = 0; w < sce0->ics.num_windows; w += sce0->ics.group_len[w]) {
999 123 start = 0;
1000
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 5485 for (g = 0; g < sce0->ics.num_swb; g++) {
1001 5362 float bmax = bval2bmax(g * 17.0f / sce0->ics.num_swb) / 0.0045f;
1002
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 5362 if (!cpe->is_mask[w*16+g])
1003 4904 cpe->ms_mask[w*16+g] = 0;
1004
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 5362 if (!sce0->zeroes[w*16+g] && !sce1->zeroes[w*16+g] && !cpe->is_mask[w*16+g]) {
1005 3183 float Mmax = 0.0f, Smax = 0.0f;
1006
1007 /* Must compute mid/side SF and book for the whole window group */
1008
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 6578 for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
1009
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 70239 for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
1010 66844 M[i] = (sce0->coeffs[start+(w+w2)*128+i]
1011 66844 + sce1->coeffs[start+(w+w2)*128+i]) * 0.5;
1012 66844 S[i] = M[i]
1013 66844 - sce1->coeffs[start+(w+w2)*128+i];
1014 }
1015 3395 s->abs_pow34(M34, M, sce0->ics.swb_sizes[g]);
1016 3395 s->abs_pow34(S34, S, sce0->ics.swb_sizes[g]);
1017
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 70239 for (i = 0; i < sce0->ics.swb_sizes[g]; i++ ) {
1018
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 66844 Mmax = FFMAX(Mmax, M34[i]);
1019
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 66844 Smax = FFMAX(Smax, S34[i]);
1020 }
1021 }
1022
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 3331 for (sid_sf_boost = 0; sid_sf_boost < 4; sid_sf_boost++) {
1024 3294 float dist1 = 0.0f, dist2 = 0.0f;
1025 3294 int B0 = 0, B1 = 0;
1026 int minidx;
1027 int mididx, sididx;
1028 int midcb, sidcb;
1029
1030 3294 minidx = FFMIN(sce0->sf_idx[w*16+g], sce1->sf_idx[w*16+g]);
1031 3294 mididx = av_clip(minidx, 0, SCALE_MAX_POS - SCALE_DIV_512);
1032 3294 sididx = av_clip(minidx - sid_sf_boost * 3, 0, SCALE_MAX_POS - SCALE_DIV_512);
1033
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 3294 if (sce0->band_type[w*16+g] != NOISE_BT && sce1->band_type[w*16+g] != NOISE_BT
1034
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 3035 && ( !ff_sfdelta_can_replace(sce0, nextband0, prev_mid, mididx, w*16+g)
1035
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 3035 || !ff_sfdelta_can_replace(sce1, nextband1, prev_side, sididx, w*16+g))) {
1036 /* scalefactor range violation, bad stuff, will decrease quality unacceptably */
1037 ✗ continue;
1038 }
1039
1040 3294 midcb = find_min_book(Mmax, mididx);
1041 3294 sidcb = find_min_book(Smax, sididx);
1042
1043 /* No CB can be zero */
1044 3294 midcb = FFMAX(1,midcb);
1045 3294 sidcb = FFMAX(1,sidcb);
1046
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 6800 for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
1048 3506 FFPsyBand *band0 = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g];
1049 3506 FFPsyBand *band1 = &s->psy.ch[s->cur_channel+1].psy_bands[(w+w2)*16+g];
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 3506 float minthr = FFMIN(band0->threshold, band1->threshold);
1051 int b1,b2,b3,b4;
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 71238 for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
1053 67732 M[i] = (sce0->coeffs[start+(w+w2)*128+i]
1054 67732 + sce1->coeffs[start+(w+w2)*128+i]) * 0.5;
1055 67732 S[i] = M[i]
1056 67732 - sce1->coeffs[start+(w+w2)*128+i];
1057 }
1058
1059 3506 s->abs_pow34(L34, sce0->coeffs+start+(w+w2)*128, sce0->ics.swb_sizes[g]);
1060 3506 s->abs_pow34(R34, sce1->coeffs+start+(w+w2)*128, sce0->ics.swb_sizes[g]);
1061 3506 s->abs_pow34(M34, M, sce0->ics.swb_sizes[g]);
1062 3506 s->abs_pow34(S34, S, sce0->ics.swb_sizes[g]);
1063 7012 dist1 += quantize_band_cost(s, &sce0->coeffs[start + (w+w2)*128],
1064 L34,
1065 3506 sce0->ics.swb_sizes[g],
1066 3506 sce0->sf_idx[w*16+g],
1067 3506 sce0->band_type[w*16+g],
1068 3506 lambda / (band0->threshold + FLT_MIN), INFINITY, &b1, NULL);
1069 7012 dist1 += quantize_band_cost(s, &sce1->coeffs[start + (w+w2)*128],
1070 R34,
1071 3506 sce1->ics.swb_sizes[g],
1072 3506 sce1->sf_idx[w*16+g],
1073 3506 sce1->band_type[w*16+g],
1074 3506 lambda / (band1->threshold + FLT_MIN), INFINITY, &b2, NULL);
1075 7012 dist2 += quantize_band_cost(s, M,
1076 M34,
1077 3506 sce0->ics.swb_sizes[g],
1078 mididx,
1079 midcb,
1080 3506 lambda / (minthr + FLT_MIN), INFINITY, &b3, NULL);
1081 7012 dist2 += quantize_band_cost(s, S,
1082 S34,
1083 3506 sce1->ics.swb_sizes[g],
1084 sididx,
1085 sidcb,
1086 3506 mslambda / (minthr * bmax + FLT_MIN), INFINITY, &b4, NULL);
1087 3506 B0 += b1+b2;
1088 3506 B1 += b3+b4;
1089 3506 dist1 -= b1+b2;
1090 3506 dist2 -= b3+b4;
1091 }
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 3294 cpe->ms_mask[w*16+g] = dist2 <= dist1 && B1 < B0;
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 3294 if (cpe->ms_mask[w*16+g]) {
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 2887 if (sce0->band_type[w*16+g] != NOISE_BT && sce1->band_type[w*16+g] != NOISE_BT) {
1095 2887 sce0->sf_idx[w*16+g] = mididx;
1096 2887 sce1->sf_idx[w*16+g] = sididx;
1097 2887 sce0->band_type[w*16+g] = midcb;
1098 2887 sce1->band_type[w*16+g] = sidcb;
1099 ✗ } else if ((sce0->band_type[w*16+g] != NOISE_BT) ^ (sce1->band_type[w*16+g] != NOISE_BT)) {
1100 /* ms_mask unneeded, and it confuses some decoders */
1101 ✗ cpe->ms_mask[w*16+g] = 0;
1102 }
1103 2887 break;
1104
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 407 } else if (B1 > B0) {
1105 /* More boost won't fix this */
1106 259 break;
1107 }
1108 }
1109 }
1110
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 5362 if (!sce0->zeroes[w*16+g] && sce0->band_type[w*16+g] < RESERVED_BT)
1111 3410 prev_mid = sce0->sf_idx[w*16+g];
1112
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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)
1113 2950 prev_side = sce1->sf_idx[w*16+g];
1114 5362 start += sce0->ics.swb_sizes[g];
1115 }
1116 }
1117 }
1118
1119 const AACCoefficientsEncoder ff_aac_coders[AAC_CODER_NB] = {
1120 [AAC_CODER_ANMR] = {
1121 search_for_quantizers_anmr,
1122 encode_window_bands_info,
1123 quantize_and_encode_band,
1124 ff_aac_encode_tns_info,
1125 ff_aac_encode_ltp_info,
1126 ff_aac_encode_main_pred,
1127 ff_aac_adjust_common_pred,
1128 ff_aac_adjust_common_ltp,
1129 ff_aac_apply_main_pred,
1130 ff_aac_apply_tns,
1131 ff_aac_update_ltp,
1132 ff_aac_ltp_insert_new_frame,
1133 set_special_band_scalefactors,
1134 search_for_pns,
1135 mark_pns,
1136 ff_aac_search_for_tns,
1137 ff_aac_search_for_ltp,
1138 search_for_ms,
1139 ff_aac_search_for_is,
1140 ff_aac_search_for_pred,
1141 },
1142 [AAC_CODER_TWOLOOP] = {
1143 search_for_quantizers_twoloop,
1144 codebook_trellis_rate,
1145 quantize_and_encode_band,
1146 ff_aac_encode_tns_info,
1147 ff_aac_encode_ltp_info,
1148 ff_aac_encode_main_pred,
1149 ff_aac_adjust_common_pred,
1150 ff_aac_adjust_common_ltp,
1151 ff_aac_apply_main_pred,
1152 ff_aac_apply_tns,
1153 ff_aac_update_ltp,
1154 ff_aac_ltp_insert_new_frame,
1155 set_special_band_scalefactors,
1156 search_for_pns,
1157 mark_pns,
1158 ff_aac_search_for_tns,
1159 ff_aac_search_for_ltp,
1160 search_for_ms,
1161 ff_aac_search_for_is,
1162 ff_aac_search_for_pred,
1163 },
1164 [AAC_CODER_FAST] = {
1165 search_for_quantizers_fast,
1166 codebook_trellis_rate,
1167 quantize_and_encode_band,
1168 ff_aac_encode_tns_info,
1169 ff_aac_encode_ltp_info,
1170 ff_aac_encode_main_pred,
1171 ff_aac_adjust_common_pred,
1172 ff_aac_adjust_common_ltp,
1173 ff_aac_apply_main_pred,
1174 ff_aac_apply_tns,
1175 ff_aac_update_ltp,
1176 ff_aac_ltp_insert_new_frame,
1177 set_special_band_scalefactors,
1178 search_for_pns,
1179 mark_pns,
1180 ff_aac_search_for_tns,
1181 ff_aac_search_for_ltp,
1182 search_for_ms,
1183 ff_aac_search_for_is,
1184 ff_aac_search_for_pred,
1185 },
1186 };
1187