1/* 2 * TwinVQ decoder 3 * Copyright (c) 2009 Vitor Sessak 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#include "avcodec.h" 23#include "get_bits.h" 24#include "dsputil.h" 25#include "fft.h" 26#include "lsp.h" 27 28#include <math.h> 29#include <stdint.h> 30 31#include "twinvq_data.h" 32 33enum FrameType { 34 FT_SHORT = 0, ///< Short frame (divided in n sub-blocks) 35 FT_MEDIUM, ///< Medium frame (divided in m<n sub-blocks) 36 FT_LONG, ///< Long frame (single sub-block + PPC) 37 FT_PPC, ///< Periodic Peak Component (part of the long frame) 38}; 39 40/** 41 * Parameters and tables that are different for each frame type 42 */ 43struct FrameMode { 44 uint8_t sub; ///< Number subblocks in each frame 45 const uint16_t *bark_tab; 46 47 /** number of distinct bark scale envelope values */ 48 uint8_t bark_env_size; 49 50 const int16_t *bark_cb; ///< codebook for the bark scale envelope (BSE) 51 uint8_t bark_n_coef;///< number of BSE CB coefficients to read 52 uint8_t bark_n_bit; ///< number of bits of the BSE coefs 53 54 //@{ 55 /** main codebooks for spectrum data */ 56 const int16_t *cb0; 57 const int16_t *cb1; 58 //@} 59 60 uint8_t cb_len_read; ///< number of spectrum coefficients to read 61}; 62 63/** 64 * Parameters and tables that are different for every combination of 65 * bitrate/sample rate 66 */ 67typedef struct { 68 struct FrameMode fmode[3]; ///< frame type-dependant parameters 69 70 uint16_t size; ///< frame size in samples 71 uint8_t n_lsp; ///< number of lsp coefficients 72 const float *lspcodebook; 73 74 /* number of bits of the different LSP CB coefficients */ 75 uint8_t lsp_bit0; 76 uint8_t lsp_bit1; 77 uint8_t lsp_bit2; 78 79 uint8_t lsp_split; ///< number of CB entries for the LSP decoding 80 const int16_t *ppc_shape_cb; ///< PPC shape CB 81 82 /** number of the bits for the PPC period value */ 83 uint8_t ppc_period_bit; 84 85 uint8_t ppc_shape_bit; ///< number of bits of the PPC shape CB coeffs 86 uint8_t ppc_shape_len; ///< size of PPC shape CB 87 uint8_t pgain_bit; ///< bits for PPC gain 88 89 /** constant for peak period to peak width conversion */ 90 uint16_t peak_per2wid; 91} ModeTab; 92 93static const ModeTab mode_08_08 = { 94 { 95 { 8, bark_tab_s08_64, 10, tab.fcb08s , 1, 5, tab.cb0808s0, tab.cb0808s1, 18}, 96 { 2, bark_tab_m08_256, 20, tab.fcb08m , 2, 5, tab.cb0808m0, tab.cb0808m1, 16}, 97 { 1, bark_tab_l08_512, 30, tab.fcb08l , 3, 6, tab.cb0808l0, tab.cb0808l1, 17} 98 }, 99 512 , 12, tab.lsp08, 1, 5, 3, 3, tab.shape08 , 8, 28, 20, 6, 40 100}; 101 102static const ModeTab mode_11_08 = { 103 { 104 { 8, bark_tab_s11_64, 10, tab.fcb11s , 1, 5, tab.cb1108s0, tab.cb1108s1, 29}, 105 { 2, bark_tab_m11_256, 20, tab.fcb11m , 2, 5, tab.cb1108m0, tab.cb1108m1, 24}, 106 { 1, bark_tab_l11_512, 30, tab.fcb11l , 3, 6, tab.cb1108l0, tab.cb1108l1, 27} 107 }, 108 512 , 16, tab.lsp11, 1, 6, 4, 3, tab.shape11 , 9, 36, 30, 7, 90 109}; 110 111static const ModeTab mode_11_10 = { 112 { 113 { 8, bark_tab_s11_64, 10, tab.fcb11s , 1, 5, tab.cb1110s0, tab.cb1110s1, 21}, 114 { 2, bark_tab_m11_256, 20, tab.fcb11m , 2, 5, tab.cb1110m0, tab.cb1110m1, 18}, 115 { 1, bark_tab_l11_512, 30, tab.fcb11l , 3, 6, tab.cb1110l0, tab.cb1110l1, 20} 116 }, 117 512 , 16, tab.lsp11, 1, 6, 4, 3, tab.shape11 , 9, 36, 30, 7, 90 118}; 119 120static const ModeTab mode_16_16 = { 121 { 122 { 8, bark_tab_s16_128, 10, tab.fcb16s , 1, 5, tab.cb1616s0, tab.cb1616s1, 16}, 123 { 2, bark_tab_m16_512, 20, tab.fcb16m , 2, 5, tab.cb1616m0, tab.cb1616m1, 15}, 124 { 1, bark_tab_l16_1024,30, tab.fcb16l , 3, 6, tab.cb1616l0, tab.cb1616l1, 16} 125 }, 126 1024, 16, tab.lsp16, 1, 6, 4, 3, tab.shape16 , 9, 56, 60, 7, 180 127}; 128 129static const ModeTab mode_22_20 = { 130 { 131 { 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2220s0, tab.cb2220s1, 18}, 132 { 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2220m0, tab.cb2220m1, 17}, 133 { 1, bark_tab_l22_1024,32, tab.fcb22l_1, 4, 6, tab.cb2220l0, tab.cb2220l1, 18} 134 }, 135 1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144 136}; 137 138static const ModeTab mode_22_24 = { 139 { 140 { 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2224s0, tab.cb2224s1, 15}, 141 { 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2224m0, tab.cb2224m1, 14}, 142 { 1, bark_tab_l22_1024,32, tab.fcb22l_1, 4, 6, tab.cb2224l0, tab.cb2224l1, 15} 143 }, 144 1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144 145}; 146 147static const ModeTab mode_22_32 = { 148 { 149 { 4, bark_tab_s22_128, 10, tab.fcb22s_2, 1, 6, tab.cb2232s0, tab.cb2232s1, 11}, 150 { 2, bark_tab_m22_256, 20, tab.fcb22m_2, 2, 6, tab.cb2232m0, tab.cb2232m1, 11}, 151 { 1, bark_tab_l22_512, 32, tab.fcb22l_2, 4, 6, tab.cb2232l0, tab.cb2232l1, 12} 152 }, 153 512 , 16, tab.lsp22_2, 1, 6, 4, 4, tab.shape22_2, 9, 56, 36, 7, 72 154}; 155 156static const ModeTab mode_44_40 = { 157 { 158 {16, bark_tab_s44_128, 10, tab.fcb44s , 1, 6, tab.cb4440s0, tab.cb4440s1, 18}, 159 { 4, bark_tab_m44_512, 20, tab.fcb44m , 2, 6, tab.cb4440m0, tab.cb4440m1, 17}, 160 { 1, bark_tab_l44_2048,40, tab.fcb44l , 4, 6, tab.cb4440l0, tab.cb4440l1, 17} 161 }, 162 2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44 , 9, 84, 54, 7, 432 163}; 164 165static const ModeTab mode_44_48 = { 166 { 167 {16, bark_tab_s44_128, 10, tab.fcb44s , 1, 6, tab.cb4448s0, tab.cb4448s1, 15}, 168 { 4, bark_tab_m44_512, 20, tab.fcb44m , 2, 6, tab.cb4448m0, tab.cb4448m1, 14}, 169 { 1, bark_tab_l44_2048,40, tab.fcb44l , 4, 6, tab.cb4448l0, tab.cb4448l1, 14} 170 }, 171 2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44 , 9, 84, 54, 7, 432 172}; 173 174typedef struct TwinContext { 175 AVCodecContext *avctx; 176 DSPContext dsp; 177 FFTContext mdct_ctx[3]; 178 179 const ModeTab *mtab; 180 181 // history 182 float lsp_hist[2][20]; ///< LSP coefficients of the last frame 183 float bark_hist[3][2][40]; ///< BSE coefficients of last frame 184 185 // bitstream parameters 186 int16_t permut[4][4096]; 187 uint8_t length[4][2]; ///< main codebook stride 188 uint8_t length_change[4]; 189 uint8_t bits_main_spec[2][4][2]; ///< bits for the main codebook 190 int bits_main_spec_change[4]; 191 int n_div[4]; 192 193 float *spectrum; 194 float *curr_frame; ///< non-interleaved output 195 float *prev_frame; ///< non-interleaved previous frame 196 int last_block_pos[2]; 197 198 float *cos_tabs[3]; 199 200 // scratch buffers 201 float *tmp_buf; 202} TwinContext; 203 204#define PPC_SHAPE_CB_SIZE 64 205#define SUB_AMP_MAX 4500.0 206#define MULAW_MU 100.0 207#define GAIN_BITS 8 208#define AMP_MAX 13000.0 209#define SUB_GAIN_BITS 5 210#define WINDOW_TYPE_BITS 4 211#define PGAIN_MU 200 212 213/** @note not speed critical, hence not optimized */ 214static void memset_float(float *buf, float val, int size) 215{ 216 while (size--) 217 *buf++ = val; 218} 219 220/** 221 * Evaluate a single LPC amplitude spectrum envelope coefficient from the line 222 * spectrum pairs. 223 * 224 * @param lsp a vector of the cosinus of the LSP values 225 * @param cos_val cos(PI*i/N) where i is the index of the LPC amplitude 226 * @param order the order of the LSP (and the size of the *lsp buffer). Must 227 * be a multiple of four. 228 * @return the LPC value 229 * 230 * @todo reuse code from vorbis_dec.c: vorbis_floor0_decode 231 */ 232static float eval_lpc_spectrum(const float *lsp, float cos_val, int order) 233{ 234 int j; 235 float p = 0.5f; 236 float q = 0.5f; 237 float two_cos_w = 2.0f*cos_val; 238 239 for (j = 0; j + 1 < order; j += 2*2) { 240 // Unroll the loop once since order is a multiple of four 241 q *= lsp[j ] - two_cos_w; 242 p *= lsp[j+1] - two_cos_w; 243 244 q *= lsp[j+2] - two_cos_w; 245 p *= lsp[j+3] - two_cos_w; 246 } 247 248 p *= p * (2.0f - two_cos_w); 249 q *= q * (2.0f + two_cos_w); 250 251 return 0.5 / (p + q); 252} 253 254/** 255 * Evaluates the LPC amplitude spectrum envelope from the line spectrum pairs. 256 */ 257static void eval_lpcenv(TwinContext *tctx, const float *cos_vals, float *lpc) 258{ 259 int i; 260 const ModeTab *mtab = tctx->mtab; 261 int size_s = mtab->size / mtab->fmode[FT_SHORT].sub; 262 263 for (i = 0; i < size_s/2; i++) { 264 float cos_i = tctx->cos_tabs[0][i]; 265 lpc[i] = eval_lpc_spectrum(cos_vals, cos_i, mtab->n_lsp); 266 lpc[size_s-i-1] = eval_lpc_spectrum(cos_vals, -cos_i, mtab->n_lsp); 267 } 268} 269 270static void interpolate(float *out, float v1, float v2, int size) 271{ 272 int i; 273 float step = (v1 - v2)/(size + 1); 274 275 for (i = 0; i < size; i++) { 276 v2 += step; 277 out[i] = v2; 278 } 279} 280 281static inline float get_cos(int idx, int part, const float *cos_tab, int size) 282{ 283 return part ? -cos_tab[size - idx - 1] : 284 cos_tab[ idx ]; 285} 286 287/** 288 * Evaluates the LPC amplitude spectrum envelope from the line spectrum pairs. 289 * Probably for speed reasons, the coefficients are evaluated as 290 * siiiibiiiisiiiibiiiisiiiibiiiisiiiibiiiis ... 291 * where s is an evaluated value, i is a value interpolated from the others 292 * and b might be either calculated or interpolated, depending on an 293 * unexplained condition. 294 * 295 * @param step the size of a block "siiiibiiii" 296 * @param in the cosinus of the LSP data 297 * @param part is 0 for 0...PI (positive cossinus values) and 1 for PI...2PI 298 (negative cossinus values) 299 * @param size the size of the whole output 300 */ 301static inline void eval_lpcenv_or_interp(TwinContext *tctx, 302 enum FrameType ftype, 303 float *out, const float *in, 304 int size, int step, int part) 305{ 306 int i; 307 const ModeTab *mtab = tctx->mtab; 308 const float *cos_tab = tctx->cos_tabs[ftype]; 309 310 // Fill the 's' 311 for (i = 0; i < size; i += step) 312 out[i] = 313 eval_lpc_spectrum(in, 314 get_cos(i, part, cos_tab, size), 315 mtab->n_lsp); 316 317 // Fill the 'iiiibiiii' 318 for (i = step; i <= size - 2*step; i += step) { 319 if (out[i + step] + out[i - step] > 1.95*out[i] || 320 out[i + step] >= out[i - step]) { 321 interpolate(out + i - step + 1, out[i], out[i-step], step - 1); 322 } else { 323 out[i - step/2] = 324 eval_lpc_spectrum(in, 325 get_cos(i-step/2, part, cos_tab, size), 326 mtab->n_lsp); 327 interpolate(out + i - step + 1, out[i-step/2], out[i-step ], step/2 - 1); 328 interpolate(out + i - step/2 + 1, out[i ], out[i-step/2], step/2 - 1); 329 } 330 } 331 332 interpolate(out + size - 2*step + 1, out[size-step], out[size - 2*step], step - 1); 333} 334 335static void eval_lpcenv_2parts(TwinContext *tctx, enum FrameType ftype, 336 const float *buf, float *lpc, 337 int size, int step) 338{ 339 eval_lpcenv_or_interp(tctx, ftype, lpc , buf, size/2, step, 0); 340 eval_lpcenv_or_interp(tctx, ftype, lpc + size/2, buf, size/2, 2*step, 1); 341 342 interpolate(lpc+size/2-step+1, lpc[size/2], lpc[size/2-step], step); 343 344 memset_float(lpc + size - 2*step + 1, lpc[size - 2*step], 2*step - 1); 345} 346 347/** 348 * Inverse quantization. Read CB coefficients for cb1 and cb2 from the 349 * bitstream, sum the corresponding vectors and write the result to *out 350 * after permutation. 351 */ 352static void dequant(TwinContext *tctx, GetBitContext *gb, float *out, 353 enum FrameType ftype, 354 const int16_t *cb0, const int16_t *cb1, int cb_len) 355{ 356 int pos = 0; 357 int i, j; 358 359 for (i = 0; i < tctx->n_div[ftype]; i++) { 360 int tmp0, tmp1; 361 int sign0 = 1; 362 int sign1 = 1; 363 const int16_t *tab0, *tab1; 364 int length = tctx->length[ftype][i >= tctx->length_change[ftype]]; 365 int bitstream_second_part = (i >= tctx->bits_main_spec_change[ftype]); 366 367 int bits = tctx->bits_main_spec[0][ftype][bitstream_second_part]; 368 if (bits == 7) { 369 if (get_bits1(gb)) 370 sign0 = -1; 371 bits = 6; 372 } 373 tmp0 = get_bits(gb, bits); 374 375 bits = tctx->bits_main_spec[1][ftype][bitstream_second_part]; 376 377 if (bits == 7) { 378 if (get_bits1(gb)) 379 sign1 = -1; 380 381 bits = 6; 382 } 383 tmp1 = get_bits(gb, bits); 384 385 tab0 = cb0 + tmp0*cb_len; 386 tab1 = cb1 + tmp1*cb_len; 387 388 for (j = 0; j < length; j++) 389 out[tctx->permut[ftype][pos+j]] = sign0*tab0[j] + sign1*tab1[j]; 390 391 pos += length; 392 } 393 394} 395 396static inline float mulawinv(float y, float clip, float mu) 397{ 398 y = av_clipf(y/clip, -1, 1); 399 return clip * FFSIGN(y) * (exp(log(1+mu) * fabs(y)) - 1) / mu; 400} 401 402/** 403 * Evaluate a*b/400 rounded to the nearest integer. When, for example, 404 * a*b == 200 and the nearest integer is ill-defined, use a table to emulate 405 * the following broken float-based implementation used by the binary decoder: 406 * 407 * \code 408 * static int very_broken_op(int a, int b) 409 * { 410 * static float test; // Ugh, force gcc to do the division first... 411 * 412 * test = a/400.; 413 * return b * test + 0.5; 414 * } 415 * \endcode 416 * 417 * @note if this function is replaced by just ROUNDED_DIV(a*b,400.), the stddev 418 * between the original file (before encoding with Yamaha encoder) and the 419 * decoded output increases, which leads one to believe that the encoder expects 420 * exactly this broken calculation. 421 */ 422static int very_broken_op(int a, int b) 423{ 424 int x = a*b + 200; 425 int size; 426 const uint8_t *rtab; 427 428 if (x%400 || b%5) 429 return x/400; 430 431 x /= 400; 432 433 size = tabs[b/5].size; 434 rtab = tabs[b/5].tab; 435 return x - rtab[size*av_log2(2*(x - 1)/size)+(x - 1)%size]; 436} 437 438/** 439 * Sum to data a periodic peak of a given period, width and shape. 440 * 441 * @param period the period of the peak divised by 400.0 442 */ 443static void add_peak(int period, int width, const float *shape, 444 float ppc_gain, float *speech, int len) 445{ 446 int i, j; 447 448 const float *shape_end = shape + len; 449 int center; 450 451 // First peak centered around zero 452 for (i = 0; i < width/2; i++) 453 speech[i] += ppc_gain * *shape++; 454 455 for (i = 1; i < ROUNDED_DIV(len,width) ; i++) { 456 center = very_broken_op(period, i); 457 for (j = -width/2; j < (width+1)/2; j++) 458 speech[j+center] += ppc_gain * *shape++; 459 } 460 461 // For the last block, be careful not to go beyond the end of the buffer 462 center = very_broken_op(period, i); 463 for (j = -width/2; j < (width + 1)/2 && shape < shape_end; j++) 464 speech[j+center] += ppc_gain * *shape++; 465} 466 467static void decode_ppc(TwinContext *tctx, int period_coef, const float *shape, 468 float ppc_gain, float *speech) 469{ 470 const ModeTab *mtab = tctx->mtab; 471 int isampf = tctx->avctx->sample_rate/1000; 472 int ibps = tctx->avctx->bit_rate/(1000 * tctx->avctx->channels); 473 int min_period = ROUNDED_DIV( 40*2*mtab->size, isampf); 474 int max_period = ROUNDED_DIV(6*40*2*mtab->size, isampf); 475 int period_range = max_period - min_period; 476 477 // This is actually the period multiplied by 400. It is just linearly coded 478 // between its maximum and minimum value. 479 int period = min_period + 480 ROUNDED_DIV(period_coef*period_range, (1 << mtab->ppc_period_bit) - 1); 481 int width; 482 483 if (isampf == 22 && ibps == 32) { 484 // For some unknown reason, NTT decided to code this case differently... 485 width = ROUNDED_DIV((period + 800)* mtab->peak_per2wid, 400*mtab->size); 486 } else 487 width = (period )* mtab->peak_per2wid/(400*mtab->size); 488 489 add_peak(period, width, shape, ppc_gain, speech, mtab->ppc_shape_len); 490} 491 492static void dec_gain(TwinContext *tctx, GetBitContext *gb, enum FrameType ftype, 493 float *out) 494{ 495 const ModeTab *mtab = tctx->mtab; 496 int i, j; 497 int sub = mtab->fmode[ftype].sub; 498 float step = AMP_MAX / ((1 << GAIN_BITS) - 1); 499 float sub_step = SUB_AMP_MAX / ((1 << SUB_GAIN_BITS) - 1); 500 501 if (ftype == FT_LONG) { 502 for (i = 0; i < tctx->avctx->channels; i++) 503 out[i] = (1./(1<<13)) * 504 mulawinv(step * 0.5 + step * get_bits(gb, GAIN_BITS), 505 AMP_MAX, MULAW_MU); 506 } else { 507 for (i = 0; i < tctx->avctx->channels; i++) { 508 float val = (1./(1<<23)) * 509 mulawinv(step * 0.5 + step * get_bits(gb, GAIN_BITS), 510 AMP_MAX, MULAW_MU); 511 512 for (j = 0; j < sub; j++) { 513 out[i*sub + j] = 514 val*mulawinv(sub_step* 0.5 + 515 sub_step* get_bits(gb, SUB_GAIN_BITS), 516 SUB_AMP_MAX, MULAW_MU); 517 } 518 } 519 } 520} 521 522/** 523 * Rearrange the LSP coefficients so that they have a minimum distance of 524 * min_dist. This function does it exactly as described in section of 3.2.4 525 * of the G.729 specification (but interestingly is different from what the 526 * reference decoder actually does). 527 */ 528static void rearrange_lsp(int order, float *lsp, float min_dist) 529{ 530 int i; 531 float min_dist2 = min_dist * 0.5; 532 for (i = 1; i < order; i++) 533 if (lsp[i] - lsp[i-1] < min_dist) { 534 float avg = (lsp[i] + lsp[i-1]) * 0.5; 535 536 lsp[i-1] = avg - min_dist2; 537 lsp[i ] = avg + min_dist2; 538 } 539} 540 541static void decode_lsp(TwinContext *tctx, int lpc_idx1, uint8_t *lpc_idx2, 542 int lpc_hist_idx, float *lsp, float *hist) 543{ 544 const ModeTab *mtab = tctx->mtab; 545 int i, j; 546 547 const float *cb = mtab->lspcodebook; 548 const float *cb2 = cb + (1 << mtab->lsp_bit1)*mtab->n_lsp; 549 const float *cb3 = cb2 + (1 << mtab->lsp_bit2)*mtab->n_lsp; 550 551 const int8_t funny_rounding[4] = { 552 -2, 553 mtab->lsp_split == 4 ? -2 : 1, 554 mtab->lsp_split == 4 ? -2 : 1, 555 0 556 }; 557 558 j = 0; 559 for (i = 0; i < mtab->lsp_split; i++) { 560 int chunk_end = ((i + 1)*mtab->n_lsp + funny_rounding[i])/mtab->lsp_split; 561 for (; j < chunk_end; j++) 562 lsp[j] = cb [lpc_idx1 * mtab->n_lsp + j] + 563 cb2[lpc_idx2[i] * mtab->n_lsp + j]; 564 } 565 566 rearrange_lsp(mtab->n_lsp, lsp, 0.0001); 567 568 for (i = 0; i < mtab->n_lsp; i++) { 569 float tmp1 = 1. - cb3[lpc_hist_idx*mtab->n_lsp + i]; 570 float tmp2 = hist[i] * cb3[lpc_hist_idx*mtab->n_lsp + i]; 571 hist[i] = lsp[i]; 572 lsp[i] = lsp[i] * tmp1 + tmp2; 573 } 574 575 rearrange_lsp(mtab->n_lsp, lsp, 0.0001); 576 rearrange_lsp(mtab->n_lsp, lsp, 0.000095); 577 ff_sort_nearly_sorted_floats(lsp, mtab->n_lsp); 578} 579 580static void dec_lpc_spectrum_inv(TwinContext *tctx, float *lsp, 581 enum FrameType ftype, float *lpc) 582{ 583 int i; 584 int size = tctx->mtab->size / tctx->mtab->fmode[ftype].sub; 585 586 for (i = 0; i < tctx->mtab->n_lsp; i++) 587 lsp[i] = 2*cos(lsp[i]); 588 589 switch (ftype) { 590 case FT_LONG: 591 eval_lpcenv_2parts(tctx, ftype, lsp, lpc, size, 8); 592 break; 593 case FT_MEDIUM: 594 eval_lpcenv_2parts(tctx, ftype, lsp, lpc, size, 2); 595 break; 596 case FT_SHORT: 597 eval_lpcenv(tctx, lsp, lpc); 598 break; 599 } 600} 601 602static void imdct_and_window(TwinContext *tctx, enum FrameType ftype, int wtype, 603 float *in, float *prev, int ch) 604{ 605 const ModeTab *mtab = tctx->mtab; 606 int bsize = mtab->size / mtab->fmode[ftype].sub; 607 int size = mtab->size; 608 float *buf1 = tctx->tmp_buf; 609 int j; 610 int wsize; // Window size 611 float *out = tctx->curr_frame + 2*ch*mtab->size; 612 float *out2 = out; 613 float *prev_buf; 614 int first_wsize; 615 616 static const uint8_t wtype_to_wsize[] = {0, 0, 2, 2, 2, 1, 0, 1, 1}; 617 int types_sizes[] = { 618 mtab->size / mtab->fmode[FT_LONG ].sub, 619 mtab->size / mtab->fmode[FT_MEDIUM].sub, 620 mtab->size / (2*mtab->fmode[FT_SHORT ].sub), 621 }; 622 623 wsize = types_sizes[wtype_to_wsize[wtype]]; 624 first_wsize = wsize; 625 prev_buf = prev + (size - bsize)/2; 626 627 for (j = 0; j < mtab->fmode[ftype].sub; j++) { 628 int sub_wtype = ftype == FT_MEDIUM ? 8 : wtype; 629 630 if (!j && wtype == 4) 631 sub_wtype = 4; 632 else if (j == mtab->fmode[ftype].sub-1 && wtype == 7) 633 sub_wtype = 7; 634 635 wsize = types_sizes[wtype_to_wsize[sub_wtype]]; 636 637 ff_imdct_half(&tctx->mdct_ctx[ftype], buf1 + bsize*j, in + bsize*j); 638 639 tctx->dsp.vector_fmul_window(out2, 640 prev_buf + (bsize-wsize)/2, 641 buf1 + bsize*j, 642 ff_sine_windows[av_log2(wsize)], 643 0.0, 644 wsize/2); 645 out2 += wsize; 646 647 memcpy(out2, buf1 + bsize*j + wsize/2, (bsize - wsize/2)*sizeof(float)); 648 649 out2 += ftype == FT_MEDIUM ? (bsize-wsize)/2 : bsize - wsize; 650 651 prev_buf = buf1 + bsize*j + bsize/2; 652 } 653 654 tctx->last_block_pos[ch] = (size + first_wsize)/2; 655} 656 657static void imdct_output(TwinContext *tctx, enum FrameType ftype, int wtype, 658 float *out) 659{ 660 const ModeTab *mtab = tctx->mtab; 661 float *prev_buf = tctx->prev_frame + tctx->last_block_pos[0]; 662 int i, j; 663 664 for (i = 0; i < tctx->avctx->channels; i++) { 665 imdct_and_window(tctx, ftype, wtype, 666 tctx->spectrum + i*mtab->size, 667 prev_buf + 2*i*mtab->size, 668 i); 669 } 670 671 if (tctx->avctx->channels == 2) { 672 for (i = 0; i < mtab->size - tctx->last_block_pos[0]; i++) { 673 float f1 = prev_buf[ i]; 674 float f2 = prev_buf[2*mtab->size + i]; 675 out[2*i ] = f1 + f2; 676 out[2*i + 1] = f1 - f2; 677 } 678 for (j = 0; i < mtab->size; j++,i++) { 679 float f1 = tctx->curr_frame[ j]; 680 float f2 = tctx->curr_frame[2*mtab->size + j]; 681 out[2*i ] = f1 + f2; 682 out[2*i + 1] = f1 - f2; 683 } 684 } else { 685 memcpy(out, prev_buf, 686 (mtab->size - tctx->last_block_pos[0]) * sizeof(*out)); 687 688 out += mtab->size - tctx->last_block_pos[0]; 689 690 memcpy(out, tctx->curr_frame, 691 (tctx->last_block_pos[0]) * sizeof(*out)); 692 } 693 694} 695 696static void dec_bark_env(TwinContext *tctx, const uint8_t *in, int use_hist, 697 int ch, float *out, float gain, enum FrameType ftype) 698{ 699 const ModeTab *mtab = tctx->mtab; 700 int i,j; 701 float *hist = tctx->bark_hist[ftype][ch]; 702 float val = ((const float []) {0.4, 0.35, 0.28})[ftype]; 703 int bark_n_coef = mtab->fmode[ftype].bark_n_coef; 704 int fw_cb_len = mtab->fmode[ftype].bark_env_size / bark_n_coef; 705 int idx = 0; 706 707 for (i = 0; i < fw_cb_len; i++) 708 for (j = 0; j < bark_n_coef; j++, idx++) { 709 float tmp2 = 710 mtab->fmode[ftype].bark_cb[fw_cb_len*in[j] + i] * (1./4096); 711 float st = use_hist ? 712 (1. - val) * tmp2 + val*hist[idx] + 1. : tmp2 + 1.; 713 714 hist[idx] = tmp2; 715 if (st < -1.) st = 1.; 716 717 memset_float(out, st * gain, mtab->fmode[ftype].bark_tab[idx]); 718 out += mtab->fmode[ftype].bark_tab[idx]; 719 } 720 721} 722 723static void read_and_decode_spectrum(TwinContext *tctx, GetBitContext *gb, 724 float *out, enum FrameType ftype) 725{ 726 const ModeTab *mtab = tctx->mtab; 727 int channels = tctx->avctx->channels; 728 int sub = mtab->fmode[ftype].sub; 729 int block_size = mtab->size / sub; 730 float gain[channels*sub]; 731 float ppc_shape[mtab->ppc_shape_len * channels * 4]; 732 uint8_t bark1[channels][sub][mtab->fmode[ftype].bark_n_coef]; 733 uint8_t bark_use_hist[channels][sub]; 734 735 uint8_t lpc_idx1[channels]; 736 uint8_t lpc_idx2[channels][tctx->mtab->lsp_split]; 737 uint8_t lpc_hist_idx[channels]; 738 739 int i, j, k; 740 741 dequant(tctx, gb, out, ftype, 742 mtab->fmode[ftype].cb0, mtab->fmode[ftype].cb1, 743 mtab->fmode[ftype].cb_len_read); 744 745 for (i = 0; i < channels; i++) 746 for (j = 0; j < sub; j++) 747 for (k = 0; k < mtab->fmode[ftype].bark_n_coef; k++) 748 bark1[i][j][k] = 749 get_bits(gb, mtab->fmode[ftype].bark_n_bit); 750 751 for (i = 0; i < channels; i++) 752 for (j = 0; j < sub; j++) 753 bark_use_hist[i][j] = get_bits1(gb); 754 755 dec_gain(tctx, gb, ftype, gain); 756 757 for (i = 0; i < channels; i++) { 758 lpc_hist_idx[i] = get_bits(gb, tctx->mtab->lsp_bit0); 759 lpc_idx1 [i] = get_bits(gb, tctx->mtab->lsp_bit1); 760 761 for (j = 0; j < tctx->mtab->lsp_split; j++) 762 lpc_idx2[i][j] = get_bits(gb, tctx->mtab->lsp_bit2); 763 } 764 765 if (ftype == FT_LONG) { 766 int cb_len_p = (tctx->n_div[3] + mtab->ppc_shape_len*channels - 1)/ 767 tctx->n_div[3]; 768 dequant(tctx, gb, ppc_shape, FT_PPC, mtab->ppc_shape_cb, 769 mtab->ppc_shape_cb + cb_len_p*PPC_SHAPE_CB_SIZE, cb_len_p); 770 } 771 772 for (i = 0; i < channels; i++) { 773 float *chunk = out + mtab->size * i; 774 float lsp[tctx->mtab->n_lsp]; 775 776 for (j = 0; j < sub; j++) { 777 dec_bark_env(tctx, bark1[i][j], bark_use_hist[i][j], i, 778 tctx->tmp_buf, gain[sub*i+j], ftype); 779 780 tctx->dsp.vector_fmul(chunk + block_size*j, tctx->tmp_buf, 781 block_size); 782 783 } 784 785 if (ftype == FT_LONG) { 786 float pgain_step = 25000. / ((1 << mtab->pgain_bit) - 1); 787 int p_coef = get_bits(gb, tctx->mtab->ppc_period_bit); 788 int g_coef = get_bits(gb, tctx->mtab->pgain_bit); 789 float v = 1./8192* 790 mulawinv(pgain_step*g_coef+ pgain_step/2, 25000., PGAIN_MU); 791 792 decode_ppc(tctx, p_coef, ppc_shape + i*mtab->ppc_shape_len, v, 793 chunk); 794 } 795 796 decode_lsp(tctx, lpc_idx1[i], lpc_idx2[i], lpc_hist_idx[i], lsp, 797 tctx->lsp_hist[i]); 798 799 dec_lpc_spectrum_inv(tctx, lsp, ftype, tctx->tmp_buf); 800 801 for (j = 0; j < mtab->fmode[ftype].sub; j++) { 802 tctx->dsp.vector_fmul(chunk, tctx->tmp_buf, block_size); 803 chunk += block_size; 804 } 805 } 806} 807 808static int twin_decode_frame(AVCodecContext * avctx, void *data, 809 int *data_size, AVPacket *avpkt) 810{ 811 const uint8_t *buf = avpkt->data; 812 int buf_size = avpkt->size; 813 TwinContext *tctx = avctx->priv_data; 814 GetBitContext gb; 815 const ModeTab *mtab = tctx->mtab; 816 float *out = data; 817 enum FrameType ftype; 818 int window_type; 819 static const enum FrameType wtype_to_ftype_table[] = { 820 FT_LONG, FT_LONG, FT_SHORT, FT_LONG, 821 FT_MEDIUM, FT_LONG, FT_LONG, FT_MEDIUM, FT_MEDIUM 822 }; 823 824 if (buf_size*8 < avctx->bit_rate*mtab->size/avctx->sample_rate + 8) { 825 av_log(avctx, AV_LOG_ERROR, 826 "Frame too small (%d bytes). Truncated file?\n", buf_size); 827 *data_size = 0; 828 return buf_size; 829 } 830 831 init_get_bits(&gb, buf, buf_size * 8); 832 skip_bits(&gb, get_bits(&gb, 8)); 833 window_type = get_bits(&gb, WINDOW_TYPE_BITS); 834 835 if (window_type > 8) { 836 av_log(avctx, AV_LOG_ERROR, "Invalid window type, broken sample?\n"); 837 return -1; 838 } 839 840 ftype = wtype_to_ftype_table[window_type]; 841 842 read_and_decode_spectrum(tctx, &gb, tctx->spectrum, ftype); 843 844 imdct_output(tctx, ftype, window_type, out); 845 846 FFSWAP(float*, tctx->curr_frame, tctx->prev_frame); 847 848 if (tctx->avctx->frame_number < 2) { 849 *data_size=0; 850 return buf_size; 851 } 852 853 *data_size = mtab->size*avctx->channels*4; 854 855 return buf_size; 856} 857 858/** 859 * Init IMDCT and windowing tables 860 */ 861static av_cold void init_mdct_win(TwinContext *tctx) 862{ 863 int i,j; 864 const ModeTab *mtab = tctx->mtab; 865 int size_s = mtab->size / mtab->fmode[FT_SHORT].sub; 866 int size_m = mtab->size / mtab->fmode[FT_MEDIUM].sub; 867 int channels = tctx->avctx->channels; 868 float norm = channels == 1 ? 2. : 1.; 869 870 for (i = 0; i < 3; i++) { 871 int bsize = tctx->mtab->size/tctx->mtab->fmode[i].sub; 872 ff_mdct_init(&tctx->mdct_ctx[i], av_log2(bsize) + 1, 1, 873 -sqrt(norm/bsize) / (1<<15)); 874 } 875 876 tctx->tmp_buf = av_malloc(mtab->size * sizeof(*tctx->tmp_buf)); 877 878 tctx->spectrum = av_malloc(2*mtab->size*channels*sizeof(float)); 879 tctx->curr_frame = av_malloc(2*mtab->size*channels*sizeof(float)); 880 tctx->prev_frame = av_malloc(2*mtab->size*channels*sizeof(float)); 881 882 for (i = 0; i < 3; i++) { 883 int m = 4*mtab->size/mtab->fmode[i].sub; 884 double freq = 2*M_PI/m; 885 tctx->cos_tabs[i] = av_malloc((m/4)*sizeof(*tctx->cos_tabs)); 886 887 for (j = 0; j <= m/8; j++) 888 tctx->cos_tabs[i][j] = cos((2*j + 1)*freq); 889 for (j = 1; j < m/8; j++) 890 tctx->cos_tabs[i][m/4-j] = tctx->cos_tabs[i][j]; 891 } 892 893 894 ff_init_ff_sine_windows(av_log2(size_m)); 895 ff_init_ff_sine_windows(av_log2(size_s/2)); 896 ff_init_ff_sine_windows(av_log2(mtab->size)); 897} 898 899/** 900 * Interpret the data as if it were a num_blocks x line_len[0] matrix and for 901 * each line do a cyclic permutation, i.e. 902 * abcdefghijklm -> defghijklmabc 903 * where the amount to be shifted is evaluated depending on the column. 904 */ 905static void permutate_in_line(int16_t *tab, int num_vect, int num_blocks, 906 int block_size, 907 const uint8_t line_len[2], int length_div, 908 enum FrameType ftype) 909 910{ 911 int i,j; 912 913 for (i = 0; i < line_len[0]; i++) { 914 int shift; 915 916 if (num_blocks == 1 || 917 (ftype == FT_LONG && num_vect % num_blocks) || 918 (ftype != FT_LONG && num_vect & 1 ) || 919 i == line_len[1]) { 920 shift = 0; 921 } else if (ftype == FT_LONG) { 922 shift = i; 923 } else 924 shift = i*i; 925 926 for (j = 0; j < num_vect && (j+num_vect*i < block_size*num_blocks); j++) 927 tab[i*num_vect+j] = i*num_vect + (j + shift) % num_vect; 928 } 929} 930 931/** 932 * Interpret the input data as in the following table: 933 * 934 * \verbatim 935 * 936 * abcdefgh 937 * ijklmnop 938 * qrstuvw 939 * x123456 940 * 941 * \endverbatim 942 * 943 * and transpose it, giving the output 944 * aiqxbjr1cks2dlt3emu4fvn5gow6hp 945 */ 946static void transpose_perm(int16_t *out, int16_t *in, int num_vect, 947 const uint8_t line_len[2], int length_div) 948{ 949 int i,j; 950 int cont= 0; 951 for (i = 0; i < num_vect; i++) 952 for (j = 0; j < line_len[i >= length_div]; j++) 953 out[cont++] = in[j*num_vect + i]; 954} 955 956static void linear_perm(int16_t *out, int16_t *in, int n_blocks, int size) 957{ 958 int block_size = size/n_blocks; 959 int i; 960 961 for (i = 0; i < size; i++) 962 out[i] = block_size * (in[i] % n_blocks) + in[i] / n_blocks; 963} 964 965static av_cold void construct_perm_table(TwinContext *tctx,enum FrameType ftype) 966{ 967 int block_size; 968 const ModeTab *mtab = tctx->mtab; 969 int size = tctx->avctx->channels*mtab->fmode[ftype].sub; 970 int16_t *tmp_perm = (int16_t *) tctx->tmp_buf; 971 972 if (ftype == FT_PPC) { 973 size = tctx->avctx->channels; 974 block_size = mtab->ppc_shape_len; 975 } else 976 block_size = mtab->size / mtab->fmode[ftype].sub; 977 978 permutate_in_line(tmp_perm, tctx->n_div[ftype], size, 979 block_size, tctx->length[ftype], 980 tctx->length_change[ftype], ftype); 981 982 transpose_perm(tctx->permut[ftype], tmp_perm, tctx->n_div[ftype], 983 tctx->length[ftype], tctx->length_change[ftype]); 984 985 linear_perm(tctx->permut[ftype], tctx->permut[ftype], size, 986 size*block_size); 987} 988 989static av_cold void init_bitstream_params(TwinContext *tctx) 990{ 991 const ModeTab *mtab = tctx->mtab; 992 int n_ch = tctx->avctx->channels; 993 int total_fr_bits = tctx->avctx->bit_rate*mtab->size/ 994 tctx->avctx->sample_rate; 995 996 int lsp_bits_per_block = n_ch*(mtab->lsp_bit0 + mtab->lsp_bit1 + 997 mtab->lsp_split*mtab->lsp_bit2); 998 999 int ppc_bits = n_ch*(mtab->pgain_bit + mtab->ppc_shape_bit + 1000 mtab->ppc_period_bit); 1001 1002 int bsize_no_main_cb[3]; 1003 int bse_bits[3]; 1004 int i; 1005 enum FrameType frametype; 1006 1007 for (i = 0; i < 3; i++) 1008 // +1 for history usage switch 1009 bse_bits[i] = n_ch * 1010 (mtab->fmode[i].bark_n_coef * mtab->fmode[i].bark_n_bit + 1); 1011 1012 bsize_no_main_cb[2] = bse_bits[2] + lsp_bits_per_block + ppc_bits + 1013 WINDOW_TYPE_BITS + n_ch*GAIN_BITS; 1014 1015 for (i = 0; i < 2; i++) 1016 bsize_no_main_cb[i] = 1017 lsp_bits_per_block + n_ch*GAIN_BITS + WINDOW_TYPE_BITS + 1018 mtab->fmode[i].sub*(bse_bits[i] + n_ch*SUB_GAIN_BITS); 1019 1020 // The remaining bits are all used for the main spectrum coefficients 1021 for (i = 0; i < 4; i++) { 1022 int bit_size; 1023 int vect_size; 1024 int rounded_up, rounded_down, num_rounded_down, num_rounded_up; 1025 if (i == 3) { 1026 bit_size = n_ch * mtab->ppc_shape_bit; 1027 vect_size = n_ch * mtab->ppc_shape_len; 1028 } else { 1029 bit_size = total_fr_bits - bsize_no_main_cb[i]; 1030 vect_size = n_ch * mtab->size; 1031 } 1032 1033 tctx->n_div[i] = (bit_size + 13) / 14; 1034 1035 rounded_up = (bit_size + tctx->n_div[i] - 1)/tctx->n_div[i]; 1036 rounded_down = (bit_size )/tctx->n_div[i]; 1037 num_rounded_down = rounded_up * tctx->n_div[i] - bit_size; 1038 num_rounded_up = tctx->n_div[i] - num_rounded_down; 1039 tctx->bits_main_spec[0][i][0] = (rounded_up + 1)/2; 1040 tctx->bits_main_spec[1][i][0] = (rounded_up )/2; 1041 tctx->bits_main_spec[0][i][1] = (rounded_down + 1)/2; 1042 tctx->bits_main_spec[1][i][1] = (rounded_down )/2; 1043 tctx->bits_main_spec_change[i] = num_rounded_up; 1044 1045 rounded_up = (vect_size + tctx->n_div[i] - 1)/tctx->n_div[i]; 1046 rounded_down = (vect_size )/tctx->n_div[i]; 1047 num_rounded_down = rounded_up * tctx->n_div[i] - vect_size; 1048 num_rounded_up = tctx->n_div[i] - num_rounded_down; 1049 tctx->length[i][0] = rounded_up; 1050 tctx->length[i][1] = rounded_down; 1051 tctx->length_change[i] = num_rounded_up; 1052 } 1053 1054 for (frametype = FT_SHORT; frametype <= FT_PPC; frametype++) 1055 construct_perm_table(tctx, frametype); 1056} 1057 1058static av_cold int twin_decode_init(AVCodecContext *avctx) 1059{ 1060 TwinContext *tctx = avctx->priv_data; 1061 int isampf = avctx->sample_rate/1000; 1062 int ibps = avctx->bit_rate/(1000 * avctx->channels); 1063 1064 tctx->avctx = avctx; 1065 avctx->sample_fmt = SAMPLE_FMT_FLT; 1066 1067 if (avctx->channels > 2) { 1068 av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %i\n", 1069 avctx->channels); 1070 return -1; 1071 } 1072 1073 switch ((isampf << 8) + ibps) { 1074 case (8 <<8) + 8: tctx->mtab = &mode_08_08; break; 1075 case (11<<8) + 8: tctx->mtab = &mode_11_08; break; 1076 case (11<<8) + 10: tctx->mtab = &mode_11_10; break; 1077 case (16<<8) + 16: tctx->mtab = &mode_16_16; break; 1078 case (22<<8) + 20: tctx->mtab = &mode_22_20; break; 1079 case (22<<8) + 24: tctx->mtab = &mode_22_24; break; 1080 case (22<<8) + 32: tctx->mtab = &mode_22_32; break; 1081 case (44<<8) + 40: tctx->mtab = &mode_44_40; break; 1082 case (44<<8) + 48: tctx->mtab = &mode_44_48; break; 1083 default: 1084 av_log(avctx, AV_LOG_ERROR, "This version does not support %d kHz - %d kbit/s/ch mode.\n", isampf, isampf); 1085 return -1; 1086 } 1087 1088 dsputil_init(&tctx->dsp, avctx); 1089 init_mdct_win(tctx); 1090 init_bitstream_params(tctx); 1091 1092 memset_float(tctx->bark_hist[0][0], 0.1, FF_ARRAY_ELEMS(tctx->bark_hist)); 1093 1094 return 0; 1095} 1096 1097static av_cold int twin_decode_close(AVCodecContext *avctx) 1098{ 1099 TwinContext *tctx = avctx->priv_data; 1100 int i; 1101 1102 for (i = 0; i < 3; i++) { 1103 ff_mdct_end(&tctx->mdct_ctx[i]); 1104 av_free(tctx->cos_tabs[i]); 1105 } 1106 1107 1108 av_free(tctx->curr_frame); 1109 av_free(tctx->spectrum); 1110 av_free(tctx->prev_frame); 1111 av_free(tctx->tmp_buf); 1112 1113 return 0; 1114} 1115 1116AVCodec twinvq_decoder = 1117{ 1118 "twinvq", 1119 AVMEDIA_TYPE_AUDIO, 1120 CODEC_ID_TWINVQ, 1121 sizeof(TwinContext), 1122 twin_decode_init, 1123 NULL, 1124 twin_decode_close, 1125 twin_decode_frame, 1126 .long_name = NULL_IF_CONFIG_SMALL("VQF TwinVQ"), 1127}; 1128