1/* 2 * WMA compatible decoder 3 * Copyright (c) 2002 The FFmpeg Project 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 * WMA compatible decoder. 25 * This decoder handles Microsoft Windows Media Audio data, versions 1 & 2. 26 * WMA v1 is identified by audio format 0x160 in Microsoft media files 27 * (ASF/AVI/WAV). WMA v2 is identified by audio format 0x161. 28 * 29 * To use this decoder, a calling application must supply the extra data 30 * bytes provided with the WMA data. These are the extra, codec-specific 31 * bytes at the end of a WAVEFORMATEX data structure. Transmit these bytes 32 * to the decoder using the extradata[_size] fields in AVCodecContext. There 33 * should be 4 extra bytes for v1 data and 6 extra bytes for v2 data. 34 */ 35 36#include "avcodec.h" 37#include "wma.h" 38 39#undef NDEBUG 40#include <assert.h> 41 42#define EXPVLCBITS 8 43#define EXPMAX ((19+EXPVLCBITS-1)/EXPVLCBITS) 44 45#define HGAINVLCBITS 9 46#define HGAINMAX ((13+HGAINVLCBITS-1)/HGAINVLCBITS) 47 48static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len); 49 50#ifdef TRACE 51static void dump_shorts(WMACodecContext *s, const char *name, const short *tab, int n) 52{ 53 int i; 54 55 tprintf(s->avctx, "%s[%d]:\n", name, n); 56 for(i=0;i<n;i++) { 57 if ((i & 7) == 0) 58 tprintf(s->avctx, "%4d: ", i); 59 tprintf(s->avctx, " %5d.0", tab[i]); 60 if ((i & 7) == 7) 61 tprintf(s->avctx, "\n"); 62 } 63} 64 65static void dump_floats(WMACodecContext *s, const char *name, int prec, const float *tab, int n) 66{ 67 int i; 68 69 tprintf(s->avctx, "%s[%d]:\n", name, n); 70 for(i=0;i<n;i++) { 71 if ((i & 7) == 0) 72 tprintf(s->avctx, "%4d: ", i); 73 tprintf(s->avctx, " %8.*f", prec, tab[i]); 74 if ((i & 7) == 7) 75 tprintf(s->avctx, "\n"); 76 } 77 if ((i & 7) != 0) 78 tprintf(s->avctx, "\n"); 79} 80#endif 81 82static int wma_decode_init(AVCodecContext * avctx) 83{ 84 WMACodecContext *s = avctx->priv_data; 85 int i, flags2; 86 uint8_t *extradata; 87 88 s->avctx = avctx; 89 90 /* extract flag infos */ 91 flags2 = 0; 92 extradata = avctx->extradata; 93 if (avctx->codec->id == CODEC_ID_WMAV1 && avctx->extradata_size >= 4) { 94 flags2 = AV_RL16(extradata+2); 95 } else if (avctx->codec->id == CODEC_ID_WMAV2 && avctx->extradata_size >= 6) { 96 flags2 = AV_RL16(extradata+4); 97 } 98// for(i=0; i<avctx->extradata_size; i++) 99// av_log(NULL, AV_LOG_ERROR, "%02X ", extradata[i]); 100 101 s->use_exp_vlc = flags2 & 0x0001; 102 s->use_bit_reservoir = flags2 & 0x0002; 103 s->use_variable_block_len = flags2 & 0x0004; 104 105 if(ff_wma_init(avctx, flags2)<0) 106 return -1; 107 108 /* init MDCT */ 109 for(i = 0; i < s->nb_block_sizes; i++) 110 ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 1, 1.0); 111 112 if (s->use_noise_coding) { 113 init_vlc(&s->hgain_vlc, HGAINVLCBITS, sizeof(ff_wma_hgain_huffbits), 114 ff_wma_hgain_huffbits, 1, 1, 115 ff_wma_hgain_huffcodes, 2, 2, 0); 116 } 117 118 if (s->use_exp_vlc) { 119 init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(ff_aac_scalefactor_bits), //FIXME move out of context 120 ff_aac_scalefactor_bits, 1, 1, 121 ff_aac_scalefactor_code, 4, 4, 0); 122 } else { 123 wma_lsp_to_curve_init(s, s->frame_len); 124 } 125 126 avctx->sample_fmt = SAMPLE_FMT_S16; 127 return 0; 128} 129 130/** 131 * compute x^-0.25 with an exponent and mantissa table. We use linear 132 * interpolation to reduce the mantissa table size at a small speed 133 * expense (linear interpolation approximately doubles the number of 134 * bits of precision). 135 */ 136static inline float pow_m1_4(WMACodecContext *s, float x) 137{ 138 union { 139 float f; 140 unsigned int v; 141 } u, t; 142 unsigned int e, m; 143 float a, b; 144 145 u.f = x; 146 e = u.v >> 23; 147 m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1); 148 /* build interpolation scale: 1 <= t < 2. */ 149 t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23); 150 a = s->lsp_pow_m_table1[m]; 151 b = s->lsp_pow_m_table2[m]; 152 return s->lsp_pow_e_table[e] * (a + b * t.f); 153} 154 155static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len) 156{ 157 float wdel, a, b; 158 int i, e, m; 159 160 wdel = M_PI / frame_len; 161 for(i=0;i<frame_len;i++) 162 s->lsp_cos_table[i] = 2.0f * cos(wdel * i); 163 164 /* tables for x^-0.25 computation */ 165 for(i=0;i<256;i++) { 166 e = i - 126; 167 s->lsp_pow_e_table[i] = pow(2.0, e * -0.25); 168 } 169 170 /* NOTE: these two tables are needed to avoid two operations in 171 pow_m1_4 */ 172 b = 1.0; 173 for(i=(1 << LSP_POW_BITS) - 1;i>=0;i--) { 174 m = (1 << LSP_POW_BITS) + i; 175 a = (float)m * (0.5 / (1 << LSP_POW_BITS)); 176 a = pow(a, -0.25); 177 s->lsp_pow_m_table1[i] = 2 * a - b; 178 s->lsp_pow_m_table2[i] = b - a; 179 b = a; 180 } 181#if 0 182 for(i=1;i<20;i++) { 183 float v, r1, r2; 184 v = 5.0 / i; 185 r1 = pow_m1_4(s, v); 186 r2 = pow(v,-0.25); 187 printf("%f^-0.25=%f e=%f\n", v, r1, r2 - r1); 188 } 189#endif 190} 191 192/** 193 * NOTE: We use the same code as Vorbis here 194 * @todo optimize it further with SSE/3Dnow 195 */ 196static void wma_lsp_to_curve(WMACodecContext *s, 197 float *out, float *val_max_ptr, 198 int n, float *lsp) 199{ 200 int i, j; 201 float p, q, w, v, val_max; 202 203 val_max = 0; 204 for(i=0;i<n;i++) { 205 p = 0.5f; 206 q = 0.5f; 207 w = s->lsp_cos_table[i]; 208 for(j=1;j<NB_LSP_COEFS;j+=2){ 209 q *= w - lsp[j - 1]; 210 p *= w - lsp[j]; 211 } 212 p *= p * (2.0f - w); 213 q *= q * (2.0f + w); 214 v = p + q; 215 v = pow_m1_4(s, v); 216 if (v > val_max) 217 val_max = v; 218 out[i] = v; 219 } 220 *val_max_ptr = val_max; 221} 222 223/** 224 * decode exponents coded with LSP coefficients (same idea as Vorbis) 225 */ 226static void decode_exp_lsp(WMACodecContext *s, int ch) 227{ 228 float lsp_coefs[NB_LSP_COEFS]; 229 int val, i; 230 231 for(i = 0; i < NB_LSP_COEFS; i++) { 232 if (i == 0 || i >= 8) 233 val = get_bits(&s->gb, 3); 234 else 235 val = get_bits(&s->gb, 4); 236 lsp_coefs[i] = ff_wma_lsp_codebook[i][val]; 237 } 238 239 wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch], 240 s->block_len, lsp_coefs); 241} 242 243/** pow(10, i / 16.0) for i in -60..95 */ 244static const float pow_tab[] = { 245 1.7782794100389e-04, 2.0535250264571e-04, 246 2.3713737056617e-04, 2.7384196342644e-04, 247 3.1622776601684e-04, 3.6517412725484e-04, 248 4.2169650342858e-04, 4.8696752516586e-04, 249 5.6234132519035e-04, 6.4938163157621e-04, 250 7.4989420933246e-04, 8.6596432336006e-04, 251 1.0000000000000e-03, 1.1547819846895e-03, 252 1.3335214321633e-03, 1.5399265260595e-03, 253 1.7782794100389e-03, 2.0535250264571e-03, 254 2.3713737056617e-03, 2.7384196342644e-03, 255 3.1622776601684e-03, 3.6517412725484e-03, 256 4.2169650342858e-03, 4.8696752516586e-03, 257 5.6234132519035e-03, 6.4938163157621e-03, 258 7.4989420933246e-03, 8.6596432336006e-03, 259 1.0000000000000e-02, 1.1547819846895e-02, 260 1.3335214321633e-02, 1.5399265260595e-02, 261 1.7782794100389e-02, 2.0535250264571e-02, 262 2.3713737056617e-02, 2.7384196342644e-02, 263 3.1622776601684e-02, 3.6517412725484e-02, 264 4.2169650342858e-02, 4.8696752516586e-02, 265 5.6234132519035e-02, 6.4938163157621e-02, 266 7.4989420933246e-02, 8.6596432336007e-02, 267 1.0000000000000e-01, 1.1547819846895e-01, 268 1.3335214321633e-01, 1.5399265260595e-01, 269 1.7782794100389e-01, 2.0535250264571e-01, 270 2.3713737056617e-01, 2.7384196342644e-01, 271 3.1622776601684e-01, 3.6517412725484e-01, 272 4.2169650342858e-01, 4.8696752516586e-01, 273 5.6234132519035e-01, 6.4938163157621e-01, 274 7.4989420933246e-01, 8.6596432336007e-01, 275 1.0000000000000e+00, 1.1547819846895e+00, 276 1.3335214321633e+00, 1.5399265260595e+00, 277 1.7782794100389e+00, 2.0535250264571e+00, 278 2.3713737056617e+00, 2.7384196342644e+00, 279 3.1622776601684e+00, 3.6517412725484e+00, 280 4.2169650342858e+00, 4.8696752516586e+00, 281 5.6234132519035e+00, 6.4938163157621e+00, 282 7.4989420933246e+00, 8.6596432336007e+00, 283 1.0000000000000e+01, 1.1547819846895e+01, 284 1.3335214321633e+01, 1.5399265260595e+01, 285 1.7782794100389e+01, 2.0535250264571e+01, 286 2.3713737056617e+01, 2.7384196342644e+01, 287 3.1622776601684e+01, 3.6517412725484e+01, 288 4.2169650342858e+01, 4.8696752516586e+01, 289 5.6234132519035e+01, 6.4938163157621e+01, 290 7.4989420933246e+01, 8.6596432336007e+01, 291 1.0000000000000e+02, 1.1547819846895e+02, 292 1.3335214321633e+02, 1.5399265260595e+02, 293 1.7782794100389e+02, 2.0535250264571e+02, 294 2.3713737056617e+02, 2.7384196342644e+02, 295 3.1622776601684e+02, 3.6517412725484e+02, 296 4.2169650342858e+02, 4.8696752516586e+02, 297 5.6234132519035e+02, 6.4938163157621e+02, 298 7.4989420933246e+02, 8.6596432336007e+02, 299 1.0000000000000e+03, 1.1547819846895e+03, 300 1.3335214321633e+03, 1.5399265260595e+03, 301 1.7782794100389e+03, 2.0535250264571e+03, 302 2.3713737056617e+03, 2.7384196342644e+03, 303 3.1622776601684e+03, 3.6517412725484e+03, 304 4.2169650342858e+03, 4.8696752516586e+03, 305 5.6234132519035e+03, 6.4938163157621e+03, 306 7.4989420933246e+03, 8.6596432336007e+03, 307 1.0000000000000e+04, 1.1547819846895e+04, 308 1.3335214321633e+04, 1.5399265260595e+04, 309 1.7782794100389e+04, 2.0535250264571e+04, 310 2.3713737056617e+04, 2.7384196342644e+04, 311 3.1622776601684e+04, 3.6517412725484e+04, 312 4.2169650342858e+04, 4.8696752516586e+04, 313 5.6234132519035e+04, 6.4938163157621e+04, 314 7.4989420933246e+04, 8.6596432336007e+04, 315 1.0000000000000e+05, 1.1547819846895e+05, 316 1.3335214321633e+05, 1.5399265260595e+05, 317 1.7782794100389e+05, 2.0535250264571e+05, 318 2.3713737056617e+05, 2.7384196342644e+05, 319 3.1622776601684e+05, 3.6517412725484e+05, 320 4.2169650342858e+05, 4.8696752516586e+05, 321 5.6234132519035e+05, 6.4938163157621e+05, 322 7.4989420933246e+05, 8.6596432336007e+05, 323}; 324 325/** 326 * decode exponents coded with VLC codes 327 */ 328static int decode_exp_vlc(WMACodecContext *s, int ch) 329{ 330 int last_exp, n, code; 331 const uint16_t *ptr; 332 float v, max_scale; 333 uint32_t *q, *q_end, iv; 334 const float *ptab = pow_tab + 60; 335 const uint32_t *iptab = (const uint32_t*)ptab; 336 337 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits]; 338 q = (uint32_t *)s->exponents[ch]; 339 q_end = q + s->block_len; 340 max_scale = 0; 341 if (s->version == 1) { 342 last_exp = get_bits(&s->gb, 5) + 10; 343 v = ptab[last_exp]; 344 iv = iptab[last_exp]; 345 max_scale = v; 346 n = *ptr++; 347 switch (n & 3) do { 348 case 0: *q++ = iv; 349 case 3: *q++ = iv; 350 case 2: *q++ = iv; 351 case 1: *q++ = iv; 352 } while ((n -= 4) > 0); 353 }else 354 last_exp = 36; 355 356 while (q < q_end) { 357 code = get_vlc2(&s->gb, s->exp_vlc.table, EXPVLCBITS, EXPMAX); 358 if (code < 0){ 359 av_log(s->avctx, AV_LOG_ERROR, "Exponent vlc invalid\n"); 360 return -1; 361 } 362 /* NOTE: this offset is the same as MPEG4 AAC ! */ 363 last_exp += code - 60; 364 if ((unsigned)last_exp + 60 > FF_ARRAY_ELEMS(pow_tab)) { 365 av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n", 366 last_exp); 367 return -1; 368 } 369 v = ptab[last_exp]; 370 iv = iptab[last_exp]; 371 if (v > max_scale) 372 max_scale = v; 373 n = *ptr++; 374 switch (n & 3) do { 375 case 0: *q++ = iv; 376 case 3: *q++ = iv; 377 case 2: *q++ = iv; 378 case 1: *q++ = iv; 379 } while ((n -= 4) > 0); 380 } 381 s->max_exponent[ch] = max_scale; 382 return 0; 383} 384 385 386/** 387 * Apply MDCT window and add into output. 388 * 389 * We ensure that when the windows overlap their squared sum 390 * is always 1 (MDCT reconstruction rule). 391 */ 392static void wma_window(WMACodecContext *s, float *out) 393{ 394 float *in = s->output; 395 int block_len, bsize, n; 396 397 /* left part */ 398 if (s->block_len_bits <= s->prev_block_len_bits) { 399 block_len = s->block_len; 400 bsize = s->frame_len_bits - s->block_len_bits; 401 402 s->dsp.vector_fmul_add(out, in, s->windows[bsize], 403 out, block_len); 404 405 } else { 406 block_len = 1 << s->prev_block_len_bits; 407 n = (s->block_len - block_len) / 2; 408 bsize = s->frame_len_bits - s->prev_block_len_bits; 409 410 s->dsp.vector_fmul_add(out+n, in+n, s->windows[bsize], 411 out+n, block_len); 412 413 memcpy(out+n+block_len, in+n+block_len, n*sizeof(float)); 414 } 415 416 out += s->block_len; 417 in += s->block_len; 418 419 /* right part */ 420 if (s->block_len_bits <= s->next_block_len_bits) { 421 block_len = s->block_len; 422 bsize = s->frame_len_bits - s->block_len_bits; 423 424 s->dsp.vector_fmul_reverse(out, in, s->windows[bsize], block_len); 425 426 } else { 427 block_len = 1 << s->next_block_len_bits; 428 n = (s->block_len - block_len) / 2; 429 bsize = s->frame_len_bits - s->next_block_len_bits; 430 431 memcpy(out, in, n*sizeof(float)); 432 433 s->dsp.vector_fmul_reverse(out+n, in+n, s->windows[bsize], block_len); 434 435 memset(out+n+block_len, 0, n*sizeof(float)); 436 } 437} 438 439 440/** 441 * @return 0 if OK. 1 if last block of frame. return -1 if 442 * unrecorrable error. 443 */ 444static int wma_decode_block(WMACodecContext *s) 445{ 446 int n, v, a, ch, bsize; 447 int coef_nb_bits, total_gain; 448 int nb_coefs[MAX_CHANNELS]; 449 float mdct_norm; 450 451#ifdef TRACE 452 tprintf(s->avctx, "***decode_block: %d:%d\n", s->frame_count - 1, s->block_num); 453#endif 454 455 /* compute current block length */ 456 if (s->use_variable_block_len) { 457 n = av_log2(s->nb_block_sizes - 1) + 1; 458 459 if (s->reset_block_lengths) { 460 s->reset_block_lengths = 0; 461 v = get_bits(&s->gb, n); 462 if (v >= s->nb_block_sizes){ 463 av_log(s->avctx, AV_LOG_ERROR, "prev_block_len_bits %d out of range\n", s->frame_len_bits - v); 464 return -1; 465 } 466 s->prev_block_len_bits = s->frame_len_bits - v; 467 v = get_bits(&s->gb, n); 468 if (v >= s->nb_block_sizes){ 469 av_log(s->avctx, AV_LOG_ERROR, "block_len_bits %d out of range\n", s->frame_len_bits - v); 470 return -1; 471 } 472 s->block_len_bits = s->frame_len_bits - v; 473 } else { 474 /* update block lengths */ 475 s->prev_block_len_bits = s->block_len_bits; 476 s->block_len_bits = s->next_block_len_bits; 477 } 478 v = get_bits(&s->gb, n); 479 if (v >= s->nb_block_sizes){ 480 av_log(s->avctx, AV_LOG_ERROR, "next_block_len_bits %d out of range\n", s->frame_len_bits - v); 481 return -1; 482 } 483 s->next_block_len_bits = s->frame_len_bits - v; 484 } else { 485 /* fixed block len */ 486 s->next_block_len_bits = s->frame_len_bits; 487 s->prev_block_len_bits = s->frame_len_bits; 488 s->block_len_bits = s->frame_len_bits; 489 } 490 491 /* now check if the block length is coherent with the frame length */ 492 s->block_len = 1 << s->block_len_bits; 493 if ((s->block_pos + s->block_len) > s->frame_len){ 494 av_log(s->avctx, AV_LOG_ERROR, "frame_len overflow\n"); 495 return -1; 496 } 497 498 if (s->nb_channels == 2) { 499 s->ms_stereo = get_bits1(&s->gb); 500 } 501 v = 0; 502 for(ch = 0; ch < s->nb_channels; ch++) { 503 a = get_bits1(&s->gb); 504 s->channel_coded[ch] = a; 505 v |= a; 506 } 507 508 bsize = s->frame_len_bits - s->block_len_bits; 509 510 /* if no channel coded, no need to go further */ 511 /* XXX: fix potential framing problems */ 512 if (!v) 513 goto next; 514 515 /* read total gain and extract corresponding number of bits for 516 coef escape coding */ 517 total_gain = 1; 518 for(;;) { 519 a = get_bits(&s->gb, 7); 520 total_gain += a; 521 if (a != 127) 522 break; 523 } 524 525 coef_nb_bits= ff_wma_total_gain_to_bits(total_gain); 526 527 /* compute number of coefficients */ 528 n = s->coefs_end[bsize] - s->coefs_start; 529 for(ch = 0; ch < s->nb_channels; ch++) 530 nb_coefs[ch] = n; 531 532 /* complex coding */ 533 if (s->use_noise_coding) { 534 535 for(ch = 0; ch < s->nb_channels; ch++) { 536 if (s->channel_coded[ch]) { 537 int i, n, a; 538 n = s->exponent_high_sizes[bsize]; 539 for(i=0;i<n;i++) { 540 a = get_bits1(&s->gb); 541 s->high_band_coded[ch][i] = a; 542 /* if noise coding, the coefficients are not transmitted */ 543 if (a) 544 nb_coefs[ch] -= s->exponent_high_bands[bsize][i]; 545 } 546 } 547 } 548 for(ch = 0; ch < s->nb_channels; ch++) { 549 if (s->channel_coded[ch]) { 550 int i, n, val, code; 551 552 n = s->exponent_high_sizes[bsize]; 553 val = (int)0x80000000; 554 for(i=0;i<n;i++) { 555 if (s->high_band_coded[ch][i]) { 556 if (val == (int)0x80000000) { 557 val = get_bits(&s->gb, 7) - 19; 558 } else { 559 code = get_vlc2(&s->gb, s->hgain_vlc.table, HGAINVLCBITS, HGAINMAX); 560 if (code < 0){ 561 av_log(s->avctx, AV_LOG_ERROR, "hgain vlc invalid\n"); 562 return -1; 563 } 564 val += code - 18; 565 } 566 s->high_band_values[ch][i] = val; 567 } 568 } 569 } 570 } 571 } 572 573 /* exponents can be reused in short blocks. */ 574 if ((s->block_len_bits == s->frame_len_bits) || 575 get_bits1(&s->gb)) { 576 for(ch = 0; ch < s->nb_channels; ch++) { 577 if (s->channel_coded[ch]) { 578 if (s->use_exp_vlc) { 579 if (decode_exp_vlc(s, ch) < 0) 580 return -1; 581 } else { 582 decode_exp_lsp(s, ch); 583 } 584 s->exponents_bsize[ch] = bsize; 585 } 586 } 587 } 588 589 /* parse spectral coefficients : just RLE encoding */ 590 for(ch = 0; ch < s->nb_channels; ch++) { 591 if (s->channel_coded[ch]) { 592 int tindex; 593 WMACoef* ptr = &s->coefs1[ch][0]; 594 595 /* special VLC tables are used for ms stereo because 596 there is potentially less energy there */ 597 tindex = (ch == 1 && s->ms_stereo); 598 memset(ptr, 0, s->block_len * sizeof(WMACoef)); 599 ff_wma_run_level_decode(s->avctx, &s->gb, &s->coef_vlc[tindex], 600 s->level_table[tindex], s->run_table[tindex], 601 0, ptr, 0, nb_coefs[ch], 602 s->block_len, s->frame_len_bits, coef_nb_bits); 603 } 604 if (s->version == 1 && s->nb_channels >= 2) { 605 align_get_bits(&s->gb); 606 } 607 } 608 609 /* normalize */ 610 { 611 int n4 = s->block_len / 2; 612 mdct_norm = 1.0 / (float)n4; 613 if (s->version == 1) { 614 mdct_norm *= sqrt(n4); 615 } 616 } 617 618 /* finally compute the MDCT coefficients */ 619 for(ch = 0; ch < s->nb_channels; ch++) { 620 if (s->channel_coded[ch]) { 621 WMACoef *coefs1; 622 float *coefs, *exponents, mult, mult1, noise; 623 int i, j, n, n1, last_high_band, esize; 624 float exp_power[HIGH_BAND_MAX_SIZE]; 625 626 coefs1 = s->coefs1[ch]; 627 exponents = s->exponents[ch]; 628 esize = s->exponents_bsize[ch]; 629 mult = pow(10, total_gain * 0.05) / s->max_exponent[ch]; 630 mult *= mdct_norm; 631 coefs = s->coefs[ch]; 632 if (s->use_noise_coding) { 633 mult1 = mult; 634 /* very low freqs : noise */ 635 for(i = 0;i < s->coefs_start; i++) { 636 *coefs++ = s->noise_table[s->noise_index] * 637 exponents[i<<bsize>>esize] * mult1; 638 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1); 639 } 640 641 n1 = s->exponent_high_sizes[bsize]; 642 643 /* compute power of high bands */ 644 exponents = s->exponents[ch] + 645 (s->high_band_start[bsize]<<bsize>>esize); 646 last_high_band = 0; /* avoid warning */ 647 for(j=0;j<n1;j++) { 648 n = s->exponent_high_bands[s->frame_len_bits - 649 s->block_len_bits][j]; 650 if (s->high_band_coded[ch][j]) { 651 float e2, v; 652 e2 = 0; 653 for(i = 0;i < n; i++) { 654 v = exponents[i<<bsize>>esize]; 655 e2 += v * v; 656 } 657 exp_power[j] = e2 / n; 658 last_high_band = j; 659 tprintf(s->avctx, "%d: power=%f (%d)\n", j, exp_power[j], n); 660 } 661 exponents += n<<bsize>>esize; 662 } 663 664 /* main freqs and high freqs */ 665 exponents = s->exponents[ch] + (s->coefs_start<<bsize>>esize); 666 for(j=-1;j<n1;j++) { 667 if (j < 0) { 668 n = s->high_band_start[bsize] - 669 s->coefs_start; 670 } else { 671 n = s->exponent_high_bands[s->frame_len_bits - 672 s->block_len_bits][j]; 673 } 674 if (j >= 0 && s->high_band_coded[ch][j]) { 675 /* use noise with specified power */ 676 mult1 = sqrt(exp_power[j] / exp_power[last_high_band]); 677 /* XXX: use a table */ 678 mult1 = mult1 * pow(10, s->high_band_values[ch][j] * 0.05); 679 mult1 = mult1 / (s->max_exponent[ch] * s->noise_mult); 680 mult1 *= mdct_norm; 681 for(i = 0;i < n; i++) { 682 noise = s->noise_table[s->noise_index]; 683 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1); 684 *coefs++ = noise * 685 exponents[i<<bsize>>esize] * mult1; 686 } 687 exponents += n<<bsize>>esize; 688 } else { 689 /* coded values + small noise */ 690 for(i = 0;i < n; i++) { 691 noise = s->noise_table[s->noise_index]; 692 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1); 693 *coefs++ = ((*coefs1++) + noise) * 694 exponents[i<<bsize>>esize] * mult; 695 } 696 exponents += n<<bsize>>esize; 697 } 698 } 699 700 /* very high freqs : noise */ 701 n = s->block_len - s->coefs_end[bsize]; 702 mult1 = mult * exponents[((-1<<bsize))>>esize]; 703 for(i = 0; i < n; i++) { 704 *coefs++ = s->noise_table[s->noise_index] * mult1; 705 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1); 706 } 707 } else { 708 /* XXX: optimize more */ 709 for(i = 0;i < s->coefs_start; i++) 710 *coefs++ = 0.0; 711 n = nb_coefs[ch]; 712 for(i = 0;i < n; i++) { 713 *coefs++ = coefs1[i] * exponents[i<<bsize>>esize] * mult; 714 } 715 n = s->block_len - s->coefs_end[bsize]; 716 for(i = 0;i < n; i++) 717 *coefs++ = 0.0; 718 } 719 } 720 } 721 722#ifdef TRACE 723 for(ch = 0; ch < s->nb_channels; ch++) { 724 if (s->channel_coded[ch]) { 725 dump_floats(s, "exponents", 3, s->exponents[ch], s->block_len); 726 dump_floats(s, "coefs", 1, s->coefs[ch], s->block_len); 727 } 728 } 729#endif 730 731 if (s->ms_stereo && s->channel_coded[1]) { 732 /* nominal case for ms stereo: we do it before mdct */ 733 /* no need to optimize this case because it should almost 734 never happen */ 735 if (!s->channel_coded[0]) { 736 tprintf(s->avctx, "rare ms-stereo case happened\n"); 737 memset(s->coefs[0], 0, sizeof(float) * s->block_len); 738 s->channel_coded[0] = 1; 739 } 740 741 s->dsp.butterflies_float(s->coefs[0], s->coefs[1], s->block_len); 742 } 743 744next: 745 for(ch = 0; ch < s->nb_channels; ch++) { 746 int n4, index; 747 748 n4 = s->block_len / 2; 749 if(s->channel_coded[ch]){ 750 ff_imdct_calc(&s->mdct_ctx[bsize], s->output, s->coefs[ch]); 751 }else if(!(s->ms_stereo && ch==1)) 752 memset(s->output, 0, sizeof(s->output)); 753 754 /* multiply by the window and add in the frame */ 755 index = (s->frame_len / 2) + s->block_pos - n4; 756 wma_window(s, &s->frame_out[ch][index]); 757 } 758 759 /* update block number */ 760 s->block_num++; 761 s->block_pos += s->block_len; 762 if (s->block_pos >= s->frame_len) 763 return 1; 764 else 765 return 0; 766} 767 768/* decode a frame of frame_len samples */ 769static int wma_decode_frame(WMACodecContext *s, int16_t *samples) 770{ 771 int ret, i, n, ch, incr; 772 int16_t *ptr; 773 float *iptr; 774 775#ifdef TRACE 776 tprintf(s->avctx, "***decode_frame: %d size=%d\n", s->frame_count++, s->frame_len); 777#endif 778 779 /* read each block */ 780 s->block_num = 0; 781 s->block_pos = 0; 782 for(;;) { 783 ret = wma_decode_block(s); 784 if (ret < 0) 785 return -1; 786 if (ret) 787 break; 788 } 789 790 /* convert frame to integer */ 791 n = s->frame_len; 792 incr = s->nb_channels; 793 if (s->dsp.float_to_int16_interleave == ff_float_to_int16_interleave_c) { 794 for(ch = 0; ch < s->nb_channels; ch++) { 795 ptr = samples + ch; 796 iptr = s->frame_out[ch]; 797 798 for(i=0;i<n;i++) { 799 *ptr = av_clip_int16(lrintf(*iptr++)); 800 ptr += incr; 801 } 802 /* prepare for next block */ 803 memmove(&s->frame_out[ch][0], &s->frame_out[ch][s->frame_len], 804 s->frame_len * sizeof(float)); 805 } 806 } else { 807 float *output[MAX_CHANNELS]; 808 for (ch = 0; ch < MAX_CHANNELS; ch++) 809 output[ch] = s->frame_out[ch]; 810 s->dsp.float_to_int16_interleave(samples, (const float **)output, n, incr); 811 for(ch = 0; ch < incr; ch++) { 812 /* prepare for next block */ 813 memmove(&s->frame_out[ch][0], &s->frame_out[ch][n], n * sizeof(float)); 814 } 815 } 816 817#ifdef TRACE 818 dump_shorts(s, "samples", samples, n * s->nb_channels); 819#endif 820 return 0; 821} 822 823static int wma_decode_superframe(AVCodecContext *avctx, 824 void *data, int *data_size, 825 AVPacket *avpkt) 826{ 827 const uint8_t *buf = avpkt->data; 828 int buf_size = avpkt->size; 829 WMACodecContext *s = avctx->priv_data; 830 int nb_frames, bit_offset, i, pos, len; 831 uint8_t *q; 832 int16_t *samples; 833 834 tprintf(avctx, "***decode_superframe:\n"); 835 836 if(buf_size==0){ 837 s->last_superframe_len = 0; 838 return 0; 839 } 840 if (buf_size < s->block_align) 841 return 0; 842 buf_size = s->block_align; 843 844 samples = data; 845 846 init_get_bits(&s->gb, buf, buf_size*8); 847 848 if (s->use_bit_reservoir) { 849 /* read super frame header */ 850 skip_bits(&s->gb, 4); /* super frame index */ 851 nb_frames = get_bits(&s->gb, 4) - 1; 852 853 if((nb_frames+1) * s->nb_channels * s->frame_len * sizeof(int16_t) > *data_size){ 854 av_log(s->avctx, AV_LOG_ERROR, "Insufficient output space\n"); 855 goto fail; 856 } 857 858 bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3); 859 860 if (s->last_superframe_len > 0) { 861 // printf("skip=%d\n", s->last_bitoffset); 862 /* add bit_offset bits to last frame */ 863 if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) > 864 MAX_CODED_SUPERFRAME_SIZE) 865 goto fail; 866 q = s->last_superframe + s->last_superframe_len; 867 len = bit_offset; 868 while (len > 7) { 869 *q++ = (get_bits)(&s->gb, 8); 870 len -= 8; 871 } 872 if (len > 0) { 873 *q++ = (get_bits)(&s->gb, len) << (8 - len); 874 } 875 876 /* XXX: bit_offset bits into last frame */ 877 init_get_bits(&s->gb, s->last_superframe, MAX_CODED_SUPERFRAME_SIZE*8); 878 /* skip unused bits */ 879 if (s->last_bitoffset > 0) 880 skip_bits(&s->gb, s->last_bitoffset); 881 /* this frame is stored in the last superframe and in the 882 current one */ 883 if (wma_decode_frame(s, samples) < 0) 884 goto fail; 885 samples += s->nb_channels * s->frame_len; 886 } 887 888 /* read each frame starting from bit_offset */ 889 pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3; 890 init_get_bits(&s->gb, buf + (pos >> 3), (MAX_CODED_SUPERFRAME_SIZE - (pos >> 3))*8); 891 len = pos & 7; 892 if (len > 0) 893 skip_bits(&s->gb, len); 894 895 s->reset_block_lengths = 1; 896 for(i=0;i<nb_frames;i++) { 897 if (wma_decode_frame(s, samples) < 0) 898 goto fail; 899 samples += s->nb_channels * s->frame_len; 900 } 901 902 /* we copy the end of the frame in the last frame buffer */ 903 pos = get_bits_count(&s->gb) + ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7); 904 s->last_bitoffset = pos & 7; 905 pos >>= 3; 906 len = buf_size - pos; 907 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) { 908 av_log(s->avctx, AV_LOG_ERROR, "len %d invalid\n", len); 909 goto fail; 910 } 911 s->last_superframe_len = len; 912 memcpy(s->last_superframe, buf + pos, len); 913 } else { 914 if(s->nb_channels * s->frame_len * sizeof(int16_t) > *data_size){ 915 av_log(s->avctx, AV_LOG_ERROR, "Insufficient output space\n"); 916 goto fail; 917 } 918 /* single frame decode */ 919 if (wma_decode_frame(s, samples) < 0) 920 goto fail; 921 samples += s->nb_channels * s->frame_len; 922 } 923 924//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d outbytes:%d eaten:%d\n", s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len, (int8_t *)samples - (int8_t *)data, s->block_align); 925 926 *data_size = (int8_t *)samples - (int8_t *)data; 927 return s->block_align; 928 fail: 929 /* when error, we reset the bit reservoir */ 930 s->last_superframe_len = 0; 931 return -1; 932} 933 934static av_cold void flush(AVCodecContext *avctx) 935{ 936 WMACodecContext *s = avctx->priv_data; 937 938 s->last_bitoffset= 939 s->last_superframe_len= 0; 940} 941 942AVCodec wmav1_decoder = 943{ 944 "wmav1", 945 AVMEDIA_TYPE_AUDIO, 946 CODEC_ID_WMAV1, 947 sizeof(WMACodecContext), 948 wma_decode_init, 949 NULL, 950 ff_wma_end, 951 wma_decode_superframe, 952 .flush=flush, 953 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"), 954}; 955 956AVCodec wmav2_decoder = 957{ 958 "wmav2", 959 AVMEDIA_TYPE_AUDIO, 960 CODEC_ID_WMAV2, 961 sizeof(WMACodecContext), 962 wma_decode_init, 963 NULL, 964 ff_wma_end, 965 wma_decode_superframe, 966 .flush=flush, 967 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"), 968}; 969