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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 | #include "libavutil/mathematics.h" | |
37 | #include "avcodec.h" | |
38 | #include "put_bits.h" | |
39 | #include "aac.h" | |
40 | #include "aacenc.h" | |
41 | #include "aactab.h" | |
42 | ||
43 | /** bits needed to code codebook run value for long windows */ | |
44 | static const uint8_t run_value_bits_long[64] = { | |
45 | 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, | |
46 | 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 10, | |
47 | 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, | |
48 | 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 15 | |
49 | }; | |
50 | ||
51 | /** bits needed to code codebook run value for short windows */ | |
52 | static const uint8_t run_value_bits_short[16] = { | |
53 | 3, 3, 3, 3, 3, 3, 3, 6, 6, 6, 6, 6, 6, 6, 6, 9 | |
54 | }; | |
55 | ||
56 | static const uint8_t * const run_value_bits[2] = { | |
57 | run_value_bits_long, run_value_bits_short | |
58 | }; | |
59 | ||
60 | ||
61 | /** | |
62 | * Quantize one coefficient. | |
63 | * @return absolute value of the quantized coefficient | |
64 | * @see 3GPP TS26.403 5.6.2 "Scalefactor determination" | |
65 | */ | |
66 | static av_always_inline int quant(float coef, const float Q) | |
67 | { | |
68 | float a = coef * Q; | |
69 | return sqrtf(a * sqrtf(a)) + 0.4054; | |
70 | } | |
71 | ||
72 | static void quantize_bands(int *out, const float *in, const float *scaled, | |
73 | int size, float Q34, int is_signed, int maxval) | |
74 | { | |
75 | int i; | |
76 | double qc; | |
77 | for (i = 0; i < size; i++) { | |
78 | qc = scaled[i] * Q34; | |
79 | out[i] = (int)FFMIN(qc + 0.4054, (double)maxval); | |
80 | if (is_signed && in[i] < 0.0f) { | |
81 | out[i] = -out[i]; | |
82 | } | |
83 | } | |
84 | } | |
85 | ||
86 | static void abs_pow34_v(float *out, const float *in, const int size) | |
87 | { | |
88 | #ifndef USE_REALLY_FULL_SEARCH | |
89 | int i; | |
90 | for (i = 0; i < size; i++) { | |
91 | float a = fabsf(in[i]); | |
92 | out[i] = sqrtf(a * sqrtf(a)); | |
93 | } | |
94 | #endif /* USE_REALLY_FULL_SEARCH */ | |
95 | } | |
96 | ||
97 | static const uint8_t aac_cb_range [12] = {0, 3, 3, 3, 3, 9, 9, 8, 8, 13, 13, 17}; | |
98 | static const uint8_t aac_cb_maxval[12] = {0, 1, 1, 2, 2, 4, 4, 7, 7, 12, 12, 16}; | |
99 | ||
100 | /** | |
101 | * Calculate rate distortion cost for quantizing with given codebook | |
102 | * | |
103 | * @return quantization distortion | |
104 | */ | |
105 | static av_always_inline float quantize_and_encode_band_cost_template( | |
106 | struct AACEncContext *s, | |
107 | PutBitContext *pb, const float *in, | |
108 | const float *scaled, int size, int scale_idx, | |
109 | int cb, const float lambda, const float uplim, | |
110 | int *bits, int BT_ZERO, int BT_UNSIGNED, | |
111 | int BT_PAIR, int BT_ESC) | |
112 | { | |
113 | const int q_idx = POW_SF2_ZERO - scale_idx + SCALE_ONE_POS - SCALE_DIV_512; | |
114 | const float Q = ff_aac_pow2sf_tab [q_idx]; | |
115 | const float Q34 = ff_aac_pow34sf_tab[q_idx]; | |
116 | const float IQ = ff_aac_pow2sf_tab [POW_SF2_ZERO + scale_idx - SCALE_ONE_POS + SCALE_DIV_512]; | |
117 | const float CLIPPED_ESCAPE = 165140.0f*IQ; | |
118 | int i, j; | |
119 | float cost = 0; | |
120 | const int dim = BT_PAIR ? 2 : 4; | |
121 | int resbits = 0; | |
122 | const int range = aac_cb_range[cb]; | |
123 | const int maxval = aac_cb_maxval[cb]; | |
124 | int off; | |
125 | ||
126 | if (BT_ZERO) { | |
127 | for (i = 0; i < size; i++) | |
128 | cost += in[i]*in[i]; | |
129 | if (bits) | |
130 | *bits = 0; | |
131 | return cost * lambda; | |
132 | } | |
133 | if (!scaled) { | |
134 | abs_pow34_v(s->scoefs, in, size); | |
135 | scaled = s->scoefs; | |
136 | } | |
137 | quantize_bands(s->qcoefs, in, scaled, size, Q34, !BT_UNSIGNED, maxval); | |
138 | if (BT_UNSIGNED) { | |
139 | off = 0; | |
140 | } else { | |
141 | off = maxval; | |
142 | } | |
143 | for (i = 0; i < size; i += dim) { | |
144 | const float *vec; | |
145 | int *quants = s->qcoefs + i; | |
146 | int curidx = 0; | |
147 | int curbits; | |
148 | float rd = 0.0f; | |
149 | for (j = 0; j < dim; j++) { | |
150 | curidx *= range; | |
151 | curidx += quants[j] + off; | |
152 | } | |
153 | curbits = ff_aac_spectral_bits[cb-1][curidx]; | |
154 | vec = &ff_aac_codebook_vectors[cb-1][curidx*dim]; | |
155 | if (BT_UNSIGNED) { | |
156 | for (j = 0; j < dim; j++) { | |
157 | float t = fabsf(in[i+j]); | |
158 | float di; | |
159 | if (BT_ESC && vec[j] == 64.0f) { //FIXME: slow | |
160 | if (t >= CLIPPED_ESCAPE) { | |
161 | di = t - CLIPPED_ESCAPE; | |
162 | curbits += 21; | |
163 | } else { | |
164 | int c = av_clip(quant(t, Q), 0, 8191); | |
165 | di = t - c*cbrtf(c)*IQ; | |
166 | curbits += av_log2(c)*2 - 4 + 1; | |
167 | } | |
168 | } else { | |
169 | di = t - vec[j]*IQ; | |
170 | } | |
171 | if (vec[j] != 0.0f) | |
172 | curbits++; | |
173 | rd += di*di; | |
174 | } | |
175 | } else { | |
176 | for (j = 0; j < dim; j++) { | |
177 | float di = in[i+j] - vec[j]*IQ; | |
178 | rd += di*di; | |
179 | } | |
180 | } | |
181 | cost += rd * lambda + curbits; | |
182 | resbits += curbits; | |
183 | if (cost >= uplim) | |
184 | return uplim; | |
185 | if (pb) { | |
186 | put_bits(pb, ff_aac_spectral_bits[cb-1][curidx], ff_aac_spectral_codes[cb-1][curidx]); | |
187 | if (BT_UNSIGNED) | |
188 | for (j = 0; j < dim; j++) | |
189 | if (ff_aac_codebook_vectors[cb-1][curidx*dim+j] != 0.0f) | |
190 | put_bits(pb, 1, in[i+j] < 0.0f); | |
191 | if (BT_ESC) { | |
192 | for (j = 0; j < 2; j++) { | |
193 | if (ff_aac_codebook_vectors[cb-1][curidx*2+j] == 64.0f) { | |
194 | int coef = av_clip(quant(fabsf(in[i+j]), Q), 0, 8191); | |
195 | int len = av_log2(coef); | |
196 | ||
197 | put_bits(pb, len - 4 + 1, (1 << (len - 4 + 1)) - 2); | |
198 | put_bits(pb, len, coef & ((1 << len) - 1)); | |
199 | } | |
200 | } | |
201 | } | |
202 | } | |
203 | } | |
204 | ||
205 | if (bits) | |
206 | *bits = resbits; | |
207 | return cost; | |
208 | } | |
209 | ||
210 | #define QUANTIZE_AND_ENCODE_BAND_COST_FUNC(NAME, BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC) \ | |
211 | static float quantize_and_encode_band_cost_ ## NAME( \ | |
212 | struct AACEncContext *s, \ | |
213 | PutBitContext *pb, const float *in, \ | |
214 | const float *scaled, int size, int scale_idx, \ | |
215 | int cb, const float lambda, const float uplim, \ | |
216 | int *bits) { \ | |
217 | return quantize_and_encode_band_cost_template( \ | |
218 | s, pb, in, scaled, size, scale_idx, \ | |
219 | BT_ESC ? ESC_BT : cb, lambda, uplim, bits, \ | |
220 | BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC); \ | |
221 | } | |
222 | ||
223 | QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ZERO, 1, 0, 0, 0) | |
224 | QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SQUAD, 0, 0, 0, 0) | |
225 | QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UQUAD, 0, 1, 0, 0) | |
226 | QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SPAIR, 0, 0, 1, 0) | |
227 | QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UPAIR, 0, 1, 1, 0) | |
228 | QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ESC, 0, 1, 1, 1) | |
229 | ||
230 | static float (*const quantize_and_encode_band_cost_arr[])( | |
231 | struct AACEncContext *s, | |
232 | PutBitContext *pb, const float *in, | |
233 | const float *scaled, int size, int scale_idx, | |
234 | int cb, const float lambda, const float uplim, | |
235 | int *bits) = { | |
236 | quantize_and_encode_band_cost_ZERO, | |
237 | quantize_and_encode_band_cost_SQUAD, | |
238 | quantize_and_encode_band_cost_SQUAD, | |
239 | quantize_and_encode_band_cost_UQUAD, | |
240 | quantize_and_encode_band_cost_UQUAD, | |
241 | quantize_and_encode_band_cost_SPAIR, | |
242 | quantize_and_encode_band_cost_SPAIR, | |
243 | quantize_and_encode_band_cost_UPAIR, | |
244 | quantize_and_encode_band_cost_UPAIR, | |
245 | quantize_and_encode_band_cost_UPAIR, | |
246 | quantize_and_encode_band_cost_UPAIR, | |
247 | quantize_and_encode_band_cost_ESC, | |
248 | }; | |
249 | ||
250 | #define quantize_and_encode_band_cost( \ | |
251 | s, pb, in, scaled, size, scale_idx, cb, \ | |
252 | lambda, uplim, bits) \ | |
253 | quantize_and_encode_band_cost_arr[cb]( \ | |
254 | s, pb, in, scaled, size, scale_idx, cb, \ | |
255 | lambda, uplim, bits) | |
256 | ||
257 | static float quantize_band_cost(struct AACEncContext *s, const float *in, | |
258 | const float *scaled, int size, int scale_idx, | |
259 | int cb, const float lambda, const float uplim, | |
260 | int *bits) | |
261 | { | |
262 | return quantize_and_encode_band_cost(s, NULL, in, scaled, size, scale_idx, | |
263 | cb, lambda, uplim, bits); | |
264 | } | |
265 | ||
266 | static void quantize_and_encode_band(struct AACEncContext *s, PutBitContext *pb, | |
267 | const float *in, int size, int scale_idx, | |
268 | int cb, const float lambda) | |
269 | { | |
270 | quantize_and_encode_band_cost(s, pb, in, NULL, size, scale_idx, cb, lambda, | |
271 | INFINITY, NULL); | |
272 | } | |
273 | ||
274 | static float find_max_val(int group_len, int swb_size, const float *scaled) { | |
275 | float maxval = 0.0f; | |
276 | int w2, i; | |
277 | for (w2 = 0; w2 < group_len; w2++) { | |
278 | for (i = 0; i < swb_size; i++) { | |
279 | maxval = FFMAX(maxval, scaled[w2*128+i]); | |
280 | } | |
281 | } | |
282 | return maxval; | |
283 | } | |
284 | ||
285 | static int find_min_book(float maxval, int sf) { | |
286 | float Q = ff_aac_pow2sf_tab[POW_SF2_ZERO - sf + SCALE_ONE_POS - SCALE_DIV_512]; | |
287 | float Q34 = sqrtf(Q * sqrtf(Q)); | |
288 | int qmaxval, cb; | |
289 | qmaxval = maxval * Q34 + 0.4054f; | |
290 | if (qmaxval == 0) cb = 0; | |
291 | else if (qmaxval == 1) cb = 1; | |
292 | else if (qmaxval == 2) cb = 3; | |
293 | else if (qmaxval <= 4) cb = 5; | |
294 | else if (qmaxval <= 7) cb = 7; | |
295 | else if (qmaxval <= 12) cb = 9; | |
296 | else cb = 11; | |
297 | return cb; | |
298 | } | |
299 | ||
300 | /** | |
301 | * structure used in optimal codebook search | |
302 | */ | |
303 | typedef struct BandCodingPath { | |
304 | int prev_idx; ///< pointer to the previous path point | |
305 | float cost; ///< path cost | |
306 | int run; | |
307 | } BandCodingPath; | |
308 | ||
309 | /** | |
310 | * Encode band info for single window group bands. | |
311 | */ | |
312 | static void encode_window_bands_info(AACEncContext *s, SingleChannelElement *sce, | |
313 | int win, int group_len, const float lambda) | |
314 | { | |
315 | BandCodingPath path[120][12]; | |
316 | int w, swb, cb, start, size; | |
317 | int i, j; | |
318 | const int max_sfb = sce->ics.max_sfb; | |
319 | const int run_bits = sce->ics.num_windows == 1 ? 5 : 3; | |
320 | const int run_esc = (1 << run_bits) - 1; | |
321 | int idx, ppos, count; | |
322 | int stackrun[120], stackcb[120], stack_len; | |
323 | float next_minrd = INFINITY; | |
324 | int next_mincb = 0; | |
325 | ||
326 | abs_pow34_v(s->scoefs, sce->coeffs, 1024); | |
327 | start = win*128; | |
328 | for (cb = 0; cb < 12; cb++) { | |
329 | path[0][cb].cost = 0.0f; | |
330 | path[0][cb].prev_idx = -1; | |
331 | path[0][cb].run = 0; | |
332 | } | |
333 | for (swb = 0; swb < max_sfb; swb++) { | |
334 | size = sce->ics.swb_sizes[swb]; | |
335 | if (sce->zeroes[win*16 + swb]) { | |
336 | for (cb = 0; cb < 12; cb++) { | |
337 | path[swb+1][cb].prev_idx = cb; | |
338 | path[swb+1][cb].cost = path[swb][cb].cost; | |
339 | path[swb+1][cb].run = path[swb][cb].run + 1; | |
340 | } | |
341 | } else { | |
342 | float minrd = next_minrd; | |
343 | int mincb = next_mincb; | |
344 | next_minrd = INFINITY; | |
345 | next_mincb = 0; | |
346 | for (cb = 0; cb < 12; cb++) { | |
347 | float cost_stay_here, cost_get_here; | |
348 | float rd = 0.0f; | |
349 | for (w = 0; w < group_len; w++) { | |
350 | FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(win+w)*16+swb]; | |
351 | rd += quantize_band_cost(s, sce->coeffs + start + w*128, | |
352 | s->scoefs + start + w*128, size, | |
353 | sce->sf_idx[(win+w)*16+swb], cb, | |
354 | lambda / band->threshold, INFINITY, NULL); | |
355 | } | |
356 | cost_stay_here = path[swb][cb].cost + rd; | |
357 | cost_get_here = minrd + rd + run_bits + 4; | |
358 | if ( run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run] | |
359 | != run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run+1]) | |
360 | cost_stay_here += run_bits; | |
361 | if (cost_get_here < cost_stay_here) { | |
362 | path[swb+1][cb].prev_idx = mincb; | |
363 | path[swb+1][cb].cost = cost_get_here; | |
364 | path[swb+1][cb].run = 1; | |
365 | } else { | |
366 | path[swb+1][cb].prev_idx = cb; | |
367 | path[swb+1][cb].cost = cost_stay_here; | |
368 | path[swb+1][cb].run = path[swb][cb].run + 1; | |
369 | } | |
370 | if (path[swb+1][cb].cost < next_minrd) { | |
371 | next_minrd = path[swb+1][cb].cost; | |
372 | next_mincb = cb; | |
373 | } | |
374 | } | |
375 | } | |
376 | start += sce->ics.swb_sizes[swb]; | |
377 | } | |
378 | ||
379 | //convert resulting path from backward-linked list | |
380 | stack_len = 0; | |
381 | idx = 0; | |
382 | for (cb = 1; cb < 12; cb++) | |
383 | if (path[max_sfb][cb].cost < path[max_sfb][idx].cost) | |
384 | idx = cb; | |
385 | ppos = max_sfb; | |
386 | while (ppos > 0) { | |
387 | cb = idx; | |
388 | stackrun[stack_len] = path[ppos][cb].run; | |
389 | stackcb [stack_len] = cb; | |
390 | idx = path[ppos-path[ppos][cb].run+1][cb].prev_idx; | |
391 | ppos -= path[ppos][cb].run; | |
392 | stack_len++; | |
393 | } | |
394 | //perform actual band info encoding | |
395 | start = 0; | |
396 | for (i = stack_len - 1; i >= 0; i--) { | |
397 | put_bits(&s->pb, 4, stackcb[i]); | |
398 | count = stackrun[i]; | |
399 | memset(sce->zeroes + win*16 + start, !stackcb[i], count); | |
400 | //XXX: memset when band_type is also uint8_t | |
401 | for (j = 0; j < count; j++) { | |
402 | sce->band_type[win*16 + start] = stackcb[i]; | |
403 | start++; | |
404 | } | |
405 | while (count >= run_esc) { | |
406 | put_bits(&s->pb, run_bits, run_esc); | |
407 | count -= run_esc; | |
408 | } | |
409 | put_bits(&s->pb, run_bits, count); | |
410 | } | |
411 | } | |
412 | ||
413 | static void codebook_trellis_rate(AACEncContext *s, SingleChannelElement *sce, | |
414 | int win, int group_len, const float lambda) | |
415 | { | |
416 | BandCodingPath path[120][12]; | |
417 | int w, swb, cb, start, size; | |
418 | int i, j; | |
419 | const int max_sfb = sce->ics.max_sfb; | |
420 | const int run_bits = sce->ics.num_windows == 1 ? 5 : 3; | |
421 | const int run_esc = (1 << run_bits) - 1; | |
422 | int idx, ppos, count; | |
423 | int stackrun[120], stackcb[120], stack_len; | |
424 | float next_minbits = INFINITY; | |
425 | int next_mincb = 0; | |
426 | ||
427 | abs_pow34_v(s->scoefs, sce->coeffs, 1024); | |
428 | start = win*128; | |
429 | for (cb = 0; cb < 12; cb++) { | |
430 | path[0][cb].cost = run_bits+4; | |
431 | path[0][cb].prev_idx = -1; | |
432 | path[0][cb].run = 0; | |
433 | } | |
434 | for (swb = 0; swb < max_sfb; swb++) { | |
435 | size = sce->ics.swb_sizes[swb]; | |
436 | if (sce->zeroes[win*16 + swb]) { | |
437 | float cost_stay_here = path[swb][0].cost; | |
438 | float cost_get_here = next_minbits + run_bits + 4; | |
439 | if ( run_value_bits[sce->ics.num_windows == 8][path[swb][0].run] | |
440 | != run_value_bits[sce->ics.num_windows == 8][path[swb][0].run+1]) | |
441 | cost_stay_here += run_bits; | |
442 | if (cost_get_here < cost_stay_here) { | |
443 | path[swb+1][0].prev_idx = next_mincb; | |
444 | path[swb+1][0].cost = cost_get_here; | |
445 | path[swb+1][0].run = 1; | |
446 | } else { | |
447 | path[swb+1][0].prev_idx = 0; | |
448 | path[swb+1][0].cost = cost_stay_here; | |
449 | path[swb+1][0].run = path[swb][0].run + 1; | |
450 | } | |
451 | next_minbits = path[swb+1][0].cost; | |
452 | next_mincb = 0; | |
453 | for (cb = 1; cb < 12; cb++) { | |
454 | path[swb+1][cb].cost = 61450; | |
455 | path[swb+1][cb].prev_idx = -1; | |
456 | path[swb+1][cb].run = 0; | |
457 | } | |
458 | } else { | |
459 | float minbits = next_minbits; | |
460 | int mincb = next_mincb; | |
461 | int startcb = sce->band_type[win*16+swb]; | |
462 | next_minbits = INFINITY; | |
463 | next_mincb = 0; | |
464 | for (cb = 0; cb < startcb; cb++) { | |
465 | path[swb+1][cb].cost = 61450; | |
466 | path[swb+1][cb].prev_idx = -1; | |
467 | path[swb+1][cb].run = 0; | |
468 | } | |
469 | for (cb = startcb; cb < 12; cb++) { | |
470 | float cost_stay_here, cost_get_here; | |
471 | float bits = 0.0f; | |
472 | for (w = 0; w < group_len; w++) { | |
473 | bits += quantize_band_cost(s, sce->coeffs + start + w*128, | |
474 | s->scoefs + start + w*128, size, | |
475 | sce->sf_idx[(win+w)*16+swb], cb, | |
476 | 0, INFINITY, NULL); | |
477 | } | |
478 | cost_stay_here = path[swb][cb].cost + bits; | |
479 | cost_get_here = minbits + bits + run_bits + 4; | |
480 | if ( run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run] | |
481 | != run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run+1]) | |
482 | cost_stay_here += run_bits; | |
483 | if (cost_get_here < cost_stay_here) { | |
484 | path[swb+1][cb].prev_idx = mincb; | |
485 | path[swb+1][cb].cost = cost_get_here; | |
486 | path[swb+1][cb].run = 1; | |
487 | } else { | |
488 | path[swb+1][cb].prev_idx = cb; | |
489 | path[swb+1][cb].cost = cost_stay_here; | |
490 | path[swb+1][cb].run = path[swb][cb].run + 1; | |
491 | } | |
492 | if (path[swb+1][cb].cost < next_minbits) { | |
493 | next_minbits = path[swb+1][cb].cost; | |
494 | next_mincb = cb; | |
495 | } | |
496 | } | |
497 | } | |
498 | start += sce->ics.swb_sizes[swb]; | |
499 | } | |
500 | ||
501 | //convert resulting path from backward-linked list | |
502 | stack_len = 0; | |
503 | idx = 0; | |
504 | for (cb = 1; cb < 12; cb++) | |
505 | if (path[max_sfb][cb].cost < path[max_sfb][idx].cost) | |
506 | idx = cb; | |
507 | ppos = max_sfb; | |
508 | while (ppos > 0) { | |
509 | av_assert1(idx >= 0); | |
510 | cb = idx; | |
511 | stackrun[stack_len] = path[ppos][cb].run; | |
512 | stackcb [stack_len] = cb; | |
513 | idx = path[ppos-path[ppos][cb].run+1][cb].prev_idx; | |
514 | ppos -= path[ppos][cb].run; | |
515 | stack_len++; | |
516 | } | |
517 | //perform actual band info encoding | |
518 | start = 0; | |
519 | for (i = stack_len - 1; i >= 0; i--) { | |
520 | put_bits(&s->pb, 4, stackcb[i]); | |
521 | count = stackrun[i]; | |
522 | memset(sce->zeroes + win*16 + start, !stackcb[i], count); | |
523 | //XXX: memset when band_type is also uint8_t | |
524 | for (j = 0; j < count; j++) { | |
525 | sce->band_type[win*16 + start] = stackcb[i]; | |
526 | start++; | |
527 | } | |
528 | while (count >= run_esc) { | |
529 | put_bits(&s->pb, run_bits, run_esc); | |
530 | count -= run_esc; | |
531 | } | |
532 | put_bits(&s->pb, run_bits, count); | |
533 | } | |
534 | } | |
535 | ||
536 | /** Return the minimum scalefactor where the quantized coef does not clip. */ | |
537 | static av_always_inline uint8_t coef2minsf(float coef) { | |
538 | return av_clip_uint8(log2f(coef)*4 - 69 + SCALE_ONE_POS - SCALE_DIV_512); | |
539 | } | |
540 | ||
541 | /** Return the maximum scalefactor where the quantized coef is not zero. */ | |
542 | static av_always_inline uint8_t coef2maxsf(float coef) { | |
543 | return av_clip_uint8(log2f(coef)*4 + 6 + SCALE_ONE_POS - SCALE_DIV_512); | |
544 | } | |
545 | ||
546 | typedef struct TrellisPath { | |
547 | float cost; | |
548 | int prev; | |
549 | } TrellisPath; | |
550 | ||
551 | #define TRELLIS_STAGES 121 | |
552 | #define TRELLIS_STATES (SCALE_MAX_DIFF+1) | |
553 | ||
554 | static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s, | |
555 | SingleChannelElement *sce, | |
556 | const float lambda) | |
557 | { | |
558 | int q, w, w2, g, start = 0; | |
559 | int i, j; | |
560 | int idx; | |
561 | TrellisPath paths[TRELLIS_STAGES][TRELLIS_STATES]; | |
562 | int bandaddr[TRELLIS_STAGES]; | |
563 | int minq; | |
564 | float mincost; | |
565 | float q0f = FLT_MAX, q1f = 0.0f, qnrgf = 0.0f; | |
566 | int q0, q1, qcnt = 0; | |
567 | ||
568 | for (i = 0; i < 1024; i++) { | |
569 | float t = fabsf(sce->coeffs[i]); | |
570 | if (t > 0.0f) { | |
571 | q0f = FFMIN(q0f, t); | |
572 | q1f = FFMAX(q1f, t); | |
573 | qnrgf += t*t; | |
574 | qcnt++; | |
575 | } | |
576 | } | |
577 | ||
578 | if (!qcnt) { | |
579 | memset(sce->sf_idx, 0, sizeof(sce->sf_idx)); | |
580 | memset(sce->zeroes, 1, sizeof(sce->zeroes)); | |
581 | return; | |
582 | } | |
583 | ||
584 | //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped | |
585 | q0 = coef2minsf(q0f); | |
586 | //maximum scalefactor index is when maximum coefficient after quantizing is still not zero | |
587 | q1 = coef2maxsf(q1f); | |
588 | if (q1 - q0 > 60) { | |
589 | int q0low = q0; | |
590 | int q1high = q1; | |
591 | //minimum scalefactor index is when maximum nonzero coefficient after quantizing is not clipped | |
592 | int qnrg = av_clip_uint8(log2f(sqrtf(qnrgf/qcnt))*4 - 31 + SCALE_ONE_POS - SCALE_DIV_512); | |
593 | q1 = qnrg + 30; | |
594 | q0 = qnrg - 30; | |
595 | if (q0 < q0low) { | |
596 | q1 += q0low - q0; | |
597 | q0 = q0low; | |
598 | } else if (q1 > q1high) { | |
599 | q0 -= q1 - q1high; | |
600 | q1 = q1high; | |
601 | } | |
602 | } | |
603 | ||
604 | for (i = 0; i < TRELLIS_STATES; i++) { | |
605 | paths[0][i].cost = 0.0f; | |
606 | paths[0][i].prev = -1; | |
607 | } | |
608 | for (j = 1; j < TRELLIS_STAGES; j++) { | |
609 | for (i = 0; i < TRELLIS_STATES; i++) { | |
610 | paths[j][i].cost = INFINITY; | |
611 | paths[j][i].prev = -2; | |
612 | } | |
613 | } | |
614 | idx = 1; | |
615 | abs_pow34_v(s->scoefs, sce->coeffs, 1024); | |
616 | for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { | |
617 | start = w*128; | |
618 | for (g = 0; g < sce->ics.num_swb; g++) { | |
619 | const float *coefs = sce->coeffs + start; | |
620 | float qmin, qmax; | |
621 | int nz = 0; | |
622 | ||
623 | bandaddr[idx] = w * 16 + g; | |
624 | qmin = INT_MAX; | |
625 | qmax = 0.0f; | |
626 | for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) { | |
627 | FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g]; | |
628 | if (band->energy <= band->threshold || band->threshold == 0.0f) { | |
629 | sce->zeroes[(w+w2)*16+g] = 1; | |
630 | continue; | |
631 | } | |
632 | sce->zeroes[(w+w2)*16+g] = 0; | |
633 | nz = 1; | |
634 | for (i = 0; i < sce->ics.swb_sizes[g]; i++) { | |
635 | float t = fabsf(coefs[w2*128+i]); | |
636 | if (t > 0.0f) | |
637 | qmin = FFMIN(qmin, t); | |
638 | qmax = FFMAX(qmax, t); | |
639 | } | |
640 | } | |
641 | if (nz) { | |
642 | int minscale, maxscale; | |
643 | float minrd = INFINITY; | |
644 | float maxval; | |
645 | //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped | |
646 | minscale = coef2minsf(qmin); | |
647 | //maximum scalefactor index is when maximum coefficient after quantizing is still not zero | |
648 | maxscale = coef2maxsf(qmax); | |
649 | minscale = av_clip(minscale - q0, 0, TRELLIS_STATES - 1); | |
650 | maxscale = av_clip(maxscale - q0, 0, TRELLIS_STATES); | |
651 | maxval = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], s->scoefs+start); | |
652 | for (q = minscale; q < maxscale; q++) { | |
653 | float dist = 0; | |
654 | int cb = find_min_book(maxval, sce->sf_idx[w*16+g]); | |
655 | for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) { | |
656 | FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g]; | |
657 | dist += quantize_band_cost(s, coefs + w2*128, s->scoefs + start + w2*128, sce->ics.swb_sizes[g], | |
658 | q + q0, cb, lambda / band->threshold, INFINITY, NULL); | |
659 | } | |
660 | minrd = FFMIN(minrd, dist); | |
661 | ||
662 | for (i = 0; i < q1 - q0; i++) { | |
663 | float cost; | |
664 | cost = paths[idx - 1][i].cost + dist | |
665 | + ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO]; | |
666 | if (cost < paths[idx][q].cost) { | |
667 | paths[idx][q].cost = cost; | |
668 | paths[idx][q].prev = i; | |
669 | } | |
670 | } | |
671 | } | |
672 | } else { | |
673 | for (q = 0; q < q1 - q0; q++) { | |
674 | paths[idx][q].cost = paths[idx - 1][q].cost + 1; | |
675 | paths[idx][q].prev = q; | |
676 | } | |
677 | } | |
678 | sce->zeroes[w*16+g] = !nz; | |
679 | start += sce->ics.swb_sizes[g]; | |
680 | idx++; | |
681 | } | |
682 | } | |
683 | idx--; | |
684 | mincost = paths[idx][0].cost; | |
685 | minq = 0; | |
686 | for (i = 1; i < TRELLIS_STATES; i++) { | |
687 | if (paths[idx][i].cost < mincost) { | |
688 | mincost = paths[idx][i].cost; | |
689 | minq = i; | |
690 | } | |
691 | } | |
692 | while (idx) { | |
693 | sce->sf_idx[bandaddr[idx]] = minq + q0; | |
694 | minq = paths[idx][minq].prev; | |
695 | idx--; | |
696 | } | |
697 | //set the same quantizers inside window groups | |
698 | for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) | |
699 | for (g = 0; g < sce->ics.num_swb; g++) | |
700 | for (w2 = 1; w2 < sce->ics.group_len[w]; w2++) | |
701 | sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g]; | |
702 | } | |
703 | ||
704 | /** | |
705 | * two-loop quantizers search taken from ISO 13818-7 Appendix C | |
706 | */ | |
707 | static void search_for_quantizers_twoloop(AVCodecContext *avctx, | |
708 | AACEncContext *s, | |
709 | SingleChannelElement *sce, | |
710 | const float lambda) | |
711 | { | |
712 | int start = 0, i, w, w2, g; | |
713 | int destbits = avctx->bit_rate * 1024.0 / avctx->sample_rate / avctx->channels * (lambda / 120.f); | |
714 | float dists[128] = { 0 }, uplims[128]; | |
715 | float maxvals[128]; | |
716 | int fflag, minscaler; | |
717 | int its = 0; | |
718 | int allz = 0; | |
719 | float minthr = INFINITY; | |
720 | ||
721 | // for values above this the decoder might end up in an endless loop | |
722 | // due to always having more bits than what can be encoded. | |
723 | destbits = FFMIN(destbits, 5800); | |
724 | //XXX: some heuristic to determine initial quantizers will reduce search time | |
725 | //determine zero bands and upper limits | |
726 | for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { | |
727 | for (g = 0; g < sce->ics.num_swb; g++) { | |
728 | int nz = 0; | |
729 | float uplim = 0.0f; | |
730 | for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) { | |
731 | FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g]; | |
732 | uplim += band->threshold; | |
733 | if (band->energy <= band->threshold || band->threshold == 0.0f) { | |
734 | sce->zeroes[(w+w2)*16+g] = 1; | |
735 | continue; | |
736 | } | |
737 | nz = 1; | |
738 | } | |
739 | uplims[w*16+g] = uplim *512; | |
740 | sce->zeroes[w*16+g] = !nz; | |
741 | if (nz) | |
742 | minthr = FFMIN(minthr, uplim); | |
743 | allz |= nz; | |
744 | } | |
745 | } | |
746 | for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { | |
747 | for (g = 0; g < sce->ics.num_swb; g++) { | |
748 | if (sce->zeroes[w*16+g]) { | |
749 | sce->sf_idx[w*16+g] = SCALE_ONE_POS; | |
750 | continue; | |
751 | } | |
752 | sce->sf_idx[w*16+g] = SCALE_ONE_POS + FFMIN(log2f(uplims[w*16+g]/minthr)*4,59); | |
753 | } | |
754 | } | |
755 | ||
756 | if (!allz) | |
757 | return; | |
758 | abs_pow34_v(s->scoefs, sce->coeffs, 1024); | |
759 | ||
760 | for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { | |
761 | start = w*128; | |
762 | for (g = 0; g < sce->ics.num_swb; g++) { | |
763 | const float *scaled = s->scoefs + start; | |
764 | maxvals[w*16+g] = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], scaled); | |
765 | start += sce->ics.swb_sizes[g]; | |
766 | } | |
767 | } | |
768 | ||
769 | //perform two-loop search | |
770 | //outer loop - improve quality | |
771 | do { | |
772 | int tbits, qstep; | |
773 | minscaler = sce->sf_idx[0]; | |
774 | //inner loop - quantize spectrum to fit into given number of bits | |
775 | qstep = its ? 1 : 32; | |
776 | do { | |
777 | int prev = -1; | |
778 | tbits = 0; | |
779 | for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { | |
780 | start = w*128; | |
781 | for (g = 0; g < sce->ics.num_swb; g++) { | |
782 | const float *coefs = sce->coeffs + start; | |
783 | const float *scaled = s->scoefs + start; | |
784 | int bits = 0; | |
785 | int cb; | |
786 | float dist = 0.0f; | |
787 | ||
788 | if (sce->zeroes[w*16+g] || sce->sf_idx[w*16+g] >= 218) { | |
789 | start += sce->ics.swb_sizes[g]; | |
790 | continue; | |
791 | } | |
792 | minscaler = FFMIN(minscaler, sce->sf_idx[w*16+g]); | |
793 | cb = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]); | |
794 | for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) { | |
795 | int b; | |
796 | dist += quantize_band_cost(s, coefs + w2*128, | |
797 | scaled + w2*128, | |
798 | sce->ics.swb_sizes[g], | |
799 | sce->sf_idx[w*16+g], | |
800 | cb, | |
801 | 1.0f, | |
802 | INFINITY, | |
803 | &b); | |
804 | bits += b; | |
805 | } | |
806 | dists[w*16+g] = dist - bits; | |
807 | if (prev != -1) { | |
808 | bits += ff_aac_scalefactor_bits[sce->sf_idx[w*16+g] - prev + SCALE_DIFF_ZERO]; | |
809 | } | |
810 | tbits += bits; | |
811 | start += sce->ics.swb_sizes[g]; | |
812 | prev = sce->sf_idx[w*16+g]; | |
813 | } | |
814 | } | |
815 | if (tbits > destbits) { | |
816 | for (i = 0; i < 128; i++) | |
817 | if (sce->sf_idx[i] < 218 - qstep) | |
818 | sce->sf_idx[i] += qstep; | |
819 | } else { | |
820 | for (i = 0; i < 128; i++) | |
821 | if (sce->sf_idx[i] > 60 - qstep) | |
822 | sce->sf_idx[i] -= qstep; | |
823 | } | |
824 | qstep >>= 1; | |
825 | if (!qstep && tbits > destbits*1.02 && sce->sf_idx[0] < 217) | |
826 | qstep = 1; | |
827 | } while (qstep); | |
828 | ||
829 | fflag = 0; | |
830 | minscaler = av_clip(minscaler, 60, 255 - SCALE_MAX_DIFF); | |
831 | for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { | |
832 | for (g = 0; g < sce->ics.num_swb; g++) { | |
833 | int prevsc = sce->sf_idx[w*16+g]; | |
834 | if (dists[w*16+g] > uplims[w*16+g] && sce->sf_idx[w*16+g] > 60) { | |
835 | if (find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]-1)) | |
836 | sce->sf_idx[w*16+g]--; | |
837 | else //Try to make sure there is some energy in every band | |
838 | sce->sf_idx[w*16+g]-=2; | |
839 | } | |
840 | sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler, minscaler + SCALE_MAX_DIFF); | |
841 | sce->sf_idx[w*16+g] = FFMIN(sce->sf_idx[w*16+g], 219); | |
842 | if (sce->sf_idx[w*16+g] != prevsc) | |
843 | fflag = 1; | |
844 | sce->band_type[w*16+g] = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]); | |
845 | } | |
846 | } | |
847 | its++; | |
848 | } while (fflag && its < 10); | |
849 | } | |
850 | ||
851 | static void search_for_quantizers_faac(AVCodecContext *avctx, AACEncContext *s, | |
852 | SingleChannelElement *sce, | |
853 | const float lambda) | |
854 | { | |
855 | int start = 0, i, w, w2, g; | |
856 | float uplim[128], maxq[128]; | |
857 | int minq, maxsf; | |
858 | float distfact = ((sce->ics.num_windows > 1) ? 85.80 : 147.84) / lambda; | |
859 | int last = 0, lastband = 0, curband = 0; | |
860 | float avg_energy = 0.0; | |
861 | if (sce->ics.num_windows == 1) { | |
862 | start = 0; | |
863 | for (i = 0; i < 1024; i++) { | |
864 | if (i - start >= sce->ics.swb_sizes[curband]) { | |
865 | start += sce->ics.swb_sizes[curband]; | |
866 | curband++; | |
867 | } | |
868 | if (sce->coeffs[i]) { | |
869 | avg_energy += sce->coeffs[i] * sce->coeffs[i]; | |
870 | last = i; | |
871 | lastband = curband; | |
872 | } | |
873 | } | |
874 | } else { | |
875 | for (w = 0; w < 8; w++) { | |
876 | const float *coeffs = sce->coeffs + w*128; | |
877 | curband = start = 0; | |
878 | for (i = 0; i < 128; i++) { | |
879 | if (i - start >= sce->ics.swb_sizes[curband]) { | |
880 | start += sce->ics.swb_sizes[curband]; | |
881 | curband++; | |
882 | } | |
883 | if (coeffs[i]) { | |
884 | avg_energy += coeffs[i] * coeffs[i]; | |
885 | last = FFMAX(last, i); | |
886 | lastband = FFMAX(lastband, curband); | |
887 | } | |
888 | } | |
889 | } | |
890 | } | |
891 | last++; | |
892 | avg_energy /= last; | |
893 | if (avg_energy == 0.0f) { | |
894 | for (i = 0; i < FF_ARRAY_ELEMS(sce->sf_idx); i++) | |
895 | sce->sf_idx[i] = SCALE_ONE_POS; | |
896 | return; | |
897 | } | |
898 | for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { | |
899 | start = w*128; | |
900 | for (g = 0; g < sce->ics.num_swb; g++) { | |
901 | float *coefs = sce->coeffs + start; | |
902 | const int size = sce->ics.swb_sizes[g]; | |
903 | int start2 = start, end2 = start + size, peakpos = start; | |
904 | float maxval = -1, thr = 0.0f, t; | |
905 | maxq[w*16+g] = 0.0f; | |
906 | if (g > lastband) { | |
907 | maxq[w*16+g] = 0.0f; | |
908 | start += size; | |
909 | for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) | |
910 | memset(coefs + w2*128, 0, sizeof(coefs[0])*size); | |
911 | continue; | |
912 | } | |
913 | for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) { | |
914 | for (i = 0; i < size; i++) { | |
915 | float t = coefs[w2*128+i]*coefs[w2*128+i]; | |
916 | maxq[w*16+g] = FFMAX(maxq[w*16+g], fabsf(coefs[w2*128 + i])); | |
917 | thr += t; | |
918 | if (sce->ics.num_windows == 1 && maxval < t) { | |
919 | maxval = t; | |
920 | peakpos = start+i; | |
921 | } | |
922 | } | |
923 | } | |
924 | if (sce->ics.num_windows == 1) { | |
925 | start2 = FFMAX(peakpos - 2, start2); | |
926 | end2 = FFMIN(peakpos + 3, end2); | |
927 | } else { | |
928 | start2 -= start; | |
929 | end2 -= start; | |
930 | } | |
931 | start += size; | |
932 | thr = pow(thr / (avg_energy * (end2 - start2)), 0.3 + 0.1*(lastband - g) / lastband); | |
933 | t = 1.0 - (1.0 * start2 / last); | |
934 | uplim[w*16+g] = distfact / (1.4 * thr + t*t*t + 0.075); | |
935 | } | |
936 | } | |
937 | memset(sce->sf_idx, 0, sizeof(sce->sf_idx)); | |
938 | abs_pow34_v(s->scoefs, sce->coeffs, 1024); | |
939 | for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { | |
940 | start = w*128; | |
941 | for (g = 0; g < sce->ics.num_swb; g++) { | |
942 | const float *coefs = sce->coeffs + start; | |
943 | const float *scaled = s->scoefs + start; | |
944 | const int size = sce->ics.swb_sizes[g]; | |
945 | int scf, prev_scf, step; | |
946 | int min_scf = -1, max_scf = 256; | |
947 | float curdiff; | |
948 | if (maxq[w*16+g] < 21.544) { | |
949 | sce->zeroes[w*16+g] = 1; | |
950 | start += size; | |
951 | continue; | |
952 | } | |
953 | sce->zeroes[w*16+g] = 0; | |
954 | scf = prev_scf = av_clip(SCALE_ONE_POS - SCALE_DIV_512 - log2f(1/maxq[w*16+g])*16/3, 60, 218); | |
955 | for (;;) { | |
956 | float dist = 0.0f; | |
957 | int quant_max; | |
958 | ||
959 | for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) { | |
960 | int b; | |
961 | dist += quantize_band_cost(s, coefs + w2*128, | |
962 | scaled + w2*128, | |
963 | sce->ics.swb_sizes[g], | |
964 | scf, | |
965 | ESC_BT, | |
966 | lambda, | |
967 | INFINITY, | |
968 | &b); | |
969 | dist -= b; | |
970 | } | |
971 | dist *= 1.0f / 512.0f / lambda; | |
972 | quant_max = quant(maxq[w*16+g], ff_aac_pow2sf_tab[POW_SF2_ZERO - scf + SCALE_ONE_POS - SCALE_DIV_512]); | |
973 | if (quant_max >= 8191) { // too much, return to the previous quantizer | |
974 | sce->sf_idx[w*16+g] = prev_scf; | |
975 | break; | |
976 | } | |
977 | prev_scf = scf; | |
978 | curdiff = fabsf(dist - uplim[w*16+g]); | |
979 | if (curdiff <= 1.0f) | |
980 | step = 0; | |
981 | else | |
982 | step = log2f(curdiff); | |
983 | if (dist > uplim[w*16+g]) | |
984 | step = -step; | |
985 | scf += step; | |
986 | scf = av_clip_uint8(scf); | |
987 | step = scf - prev_scf; | |
988 | if (FFABS(step) <= 1 || (step > 0 && scf >= max_scf) || (step < 0 && scf <= min_scf)) { | |
989 | sce->sf_idx[w*16+g] = av_clip(scf, min_scf, max_scf); | |
990 | break; | |
991 | } | |
992 | if (step > 0) | |
993 | min_scf = prev_scf; | |
994 | else | |
995 | max_scf = prev_scf; | |
996 | } | |
997 | start += size; | |
998 | } | |
999 | } | |
1000 | minq = sce->sf_idx[0] ? sce->sf_idx[0] : INT_MAX; | |
1001 | for (i = 1; i < 128; i++) { | |
1002 | if (!sce->sf_idx[i]) | |
1003 | sce->sf_idx[i] = sce->sf_idx[i-1]; | |
1004 | else | |
1005 | minq = FFMIN(minq, sce->sf_idx[i]); | |
1006 | } | |
1007 | if (minq == INT_MAX) | |
1008 | minq = 0; | |
1009 | minq = FFMIN(minq, SCALE_MAX_POS); | |
1010 | maxsf = FFMIN(minq + SCALE_MAX_DIFF, SCALE_MAX_POS); | |
1011 | for (i = 126; i >= 0; i--) { | |
1012 | if (!sce->sf_idx[i]) | |
1013 | sce->sf_idx[i] = sce->sf_idx[i+1]; | |
1014 | sce->sf_idx[i] = av_clip(sce->sf_idx[i], minq, maxsf); | |
1015 | } | |
1016 | } | |
1017 | ||
1018 | static void search_for_quantizers_fast(AVCodecContext *avctx, AACEncContext *s, | |
1019 | SingleChannelElement *sce, | |
1020 | const float lambda) | |
1021 | { | |
1022 | int i, w, w2, g; | |
1023 | int minq = 255; | |
1024 | ||
1025 | memset(sce->sf_idx, 0, sizeof(sce->sf_idx)); | |
1026 | for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { | |
1027 | for (g = 0; g < sce->ics.num_swb; g++) { | |
1028 | for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) { | |
1029 | FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g]; | |
1030 | if (band->energy <= band->threshold) { | |
1031 | sce->sf_idx[(w+w2)*16+g] = 218; | |
1032 | sce->zeroes[(w+w2)*16+g] = 1; | |
1033 | } else { | |
1034 | sce->sf_idx[(w+w2)*16+g] = av_clip(SCALE_ONE_POS - SCALE_DIV_512 + log2f(band->threshold), 80, 218); | |
1035 | sce->zeroes[(w+w2)*16+g] = 0; | |
1036 | } | |
1037 | minq = FFMIN(minq, sce->sf_idx[(w+w2)*16+g]); | |
1038 | } | |
1039 | } | |
1040 | } | |
1041 | for (i = 0; i < 128; i++) { | |
1042 | sce->sf_idx[i] = 140; | |
1043 | //av_clip(sce->sf_idx[i], minq, minq + SCALE_MAX_DIFF - 1); | |
1044 | } | |
1045 | //set the same quantizers inside window groups | |
1046 | for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) | |
1047 | for (g = 0; g < sce->ics.num_swb; g++) | |
1048 | for (w2 = 1; w2 < sce->ics.group_len[w]; w2++) | |
1049 | sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g]; | |
1050 | } | |
1051 | ||
1052 | static void search_for_ms(AACEncContext *s, ChannelElement *cpe, | |
1053 | const float lambda) | |
1054 | { | |
1055 | int start = 0, i, w, w2, g; | |
1056 | float M[128], S[128]; | |
1057 | float *L34 = s->scoefs, *R34 = s->scoefs + 128, *M34 = s->scoefs + 128*2, *S34 = s->scoefs + 128*3; | |
1058 | SingleChannelElement *sce0 = &cpe->ch[0]; | |
1059 | SingleChannelElement *sce1 = &cpe->ch[1]; | |
1060 | if (!cpe->common_window) | |
1061 | return; | |
1062 | for (w = 0; w < sce0->ics.num_windows; w += sce0->ics.group_len[w]) { | |
1063 | for (g = 0; g < sce0->ics.num_swb; g++) { | |
1064 | if (!cpe->ch[0].zeroes[w*16+g] && !cpe->ch[1].zeroes[w*16+g]) { | |
1065 | float dist1 = 0.0f, dist2 = 0.0f; | |
1066 | for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) { | |
1067 | FFPsyBand *band0 = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g]; | |
1068 | FFPsyBand *band1 = &s->psy.ch[s->cur_channel+1].psy_bands[(w+w2)*16+g]; | |
1069 | float minthr = FFMIN(band0->threshold, band1->threshold); | |
1070 | float maxthr = FFMAX(band0->threshold, band1->threshold); | |
1071 | for (i = 0; i < sce0->ics.swb_sizes[g]; i++) { | |
1072 | M[i] = (sce0->coeffs[start+w2*128+i] | |
1073 | + sce1->coeffs[start+w2*128+i]) * 0.5; | |
1074 | S[i] = M[i] | |
1075 | - sce1->coeffs[start+w2*128+i]; | |
1076 | } | |
1077 | abs_pow34_v(L34, sce0->coeffs+start+w2*128, sce0->ics.swb_sizes[g]); | |
1078 | abs_pow34_v(R34, sce1->coeffs+start+w2*128, sce0->ics.swb_sizes[g]); | |
1079 | abs_pow34_v(M34, M, sce0->ics.swb_sizes[g]); | |
1080 | abs_pow34_v(S34, S, sce0->ics.swb_sizes[g]); | |
1081 | dist1 += quantize_band_cost(s, sce0->coeffs + start + w2*128, | |
1082 | L34, | |
1083 | sce0->ics.swb_sizes[g], | |
1084 | sce0->sf_idx[(w+w2)*16+g], | |
1085 | sce0->band_type[(w+w2)*16+g], | |
1086 | lambda / band0->threshold, INFINITY, NULL); | |
1087 | dist1 += quantize_band_cost(s, sce1->coeffs + start + w2*128, | |
1088 | R34, | |
1089 | sce1->ics.swb_sizes[g], | |
1090 | sce1->sf_idx[(w+w2)*16+g], | |
1091 | sce1->band_type[(w+w2)*16+g], | |
1092 | lambda / band1->threshold, INFINITY, NULL); | |
1093 | dist2 += quantize_band_cost(s, M, | |
1094 | M34, | |
1095 | sce0->ics.swb_sizes[g], | |
1096 | sce0->sf_idx[(w+w2)*16+g], | |
1097 | sce0->band_type[(w+w2)*16+g], | |
1098 | lambda / maxthr, INFINITY, NULL); | |
1099 | dist2 += quantize_band_cost(s, S, | |
1100 | S34, | |
1101 | sce1->ics.swb_sizes[g], | |
1102 | sce1->sf_idx[(w+w2)*16+g], | |
1103 | sce1->band_type[(w+w2)*16+g], | |
1104 | lambda / minthr, INFINITY, NULL); | |
1105 | } | |
1106 | cpe->ms_mask[w*16+g] = dist2 < dist1; | |
1107 | } | |
1108 | start += sce0->ics.swb_sizes[g]; | |
1109 | } | |
1110 | } | |
1111 | } | |
1112 | ||
1113 | AACCoefficientsEncoder ff_aac_coders[AAC_CODER_NB] = { | |
1114 | [AAC_CODER_FAAC] = { | |
1115 | search_for_quantizers_faac, | |
1116 | encode_window_bands_info, | |
1117 | quantize_and_encode_band, | |
1118 | search_for_ms, | |
1119 | }, | |
1120 | [AAC_CODER_ANMR] = { | |
1121 | search_for_quantizers_anmr, | |
1122 | encode_window_bands_info, | |
1123 | quantize_and_encode_band, | |
1124 | search_for_ms, | |
1125 | }, | |
1126 | [AAC_CODER_TWOLOOP] = { | |
1127 | search_for_quantizers_twoloop, | |
1128 | codebook_trellis_rate, | |
1129 | quantize_and_encode_band, | |
1130 | search_for_ms, | |
1131 | }, | |
1132 | [AAC_CODER_FAST] = { | |
1133 | search_for_quantizers_fast, | |
1134 | encode_window_bands_info, | |
1135 | quantize_and_encode_band, | |
1136 | search_for_ms, | |
1137 | }, | |
1138 | }; |