| 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 | }; |