wmadec_filter.c

   1 /*
   2  * WMA compatible decoder
   3  *
   4  * Extracted 2009 from the mplayer source code 2009-02-10.
   5  *
   6  * Copyright (c) 2002 The FFmpeg Project
   7  *
   8  * Licensed under the GNU Lesser General Public License, see file COPYING.LIB.
   9  */
  10
  11 /** \file wmadec_filter.c paraslash's WMA decoder. */
  12
  13 /*
  14  * This decoder handles Microsoft Windows Media Audio data version 2.
  15  */
  16
  17 #include <math.h>
  18 #include <regex.h>
  19
  20 #include "para.h"
  21 #include "error.h"
  22 #include "list.h"
  23 #include "string.h"
  24 #include "sched.h"
  25 #include "buffer_tree.h"
  26 #include "filter.h"
  27 #include "portable_io.h"
  28 #include "bitstream.h"
  29 #include "imdct.h"
  30 #include "wma.h"
  31 #include "wmadata.h"
  32
  33
  34 /* size of blocks */
  35 #define BLOCK_MIN_BITS 7
  36 #define BLOCK_MAX_BITS 11
  37 #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
  38
  39 #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
  40
  41 /* XXX: find exact max size */
  42 #define HIGH_BAND_MAX_SIZE 16
  43
  44 /* XXX: is it a suitable value ? */
  45 #define MAX_CODED_SUPERFRAME_SIZE 16384
  46
  47 #define MAX_CHANNELS 2
  48
  49 #define NOISE_TAB_SIZE 8192
  50
  51 #define LSP_POW_BITS 7
  52
  53 struct private_wmadec_data {
  54         /** Information contained in the audio file header. */
  55         struct asf_header_info ahi;
  56         struct getbit_context gb;
  57         /** Whether perceptual noise is added. */
  58         int use_noise_coding;
  59         /** Depends on number of the bits per second and the frame length. */
  60         int byte_offset_bits;
  61         /** Only used if ahi->use_exp_vlc is true. */
  62         struct vlc exp_vlc;
  63         uint16_t exponent_bands[BLOCK_NB_SIZES][25];
  64         /** The index of the first coef in high band. */
  65         int high_band_start[BLOCK_NB_SIZES];
  66         /** Maximal number of coded coefficients. */
  67         int coefs_end[BLOCK_NB_SIZES];
  68         int exponent_high_sizes[BLOCK_NB_SIZES];
  69         int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
  70         struct vlc hgain_vlc;
  71
  72         /* coded values in high bands */
  73         int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
  74         int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
  75
  76         /* there are two possible tables for spectral coefficients */
  77         struct vlc coef_vlc[2];
  78         uint16_t *run_table[2];
  79         uint16_t *level_table[2];
  80         /** Frame length in samples. */
  81         int frame_len;
  82         /** log2 of frame_len. */
  83         int frame_len_bits;
  84         /** Number of block sizes, one if !ahi->use_variable_block_len. */
  85         int nb_block_sizes;
  86         /* Whether to update block lengths from getbit context. */
  87         bool reset_block_lengths;
  88         /** log2 of current block length. */
  89         int block_len_bits;
  90         /** log2 of next block length. */
  91         int next_block_len_bits;
  92         /** log2 of previous block length. */
  93         int prev_block_len_bits;
  94         /** Block length in samples. */
  95         int block_len;
  96         /** Current position in frame. */
  97         int block_pos;
  98         /** True if channel is coded. */
  99         uint8_t channel_coded[MAX_CHANNELS];
 100         /** log2 ratio frame/exp. length. */
 101         int exponents_bsize[MAX_CHANNELS];
 102
 103         float exponents[MAX_CHANNELS][BLOCK_MAX_SIZE];
 104         float max_exponent[MAX_CHANNELS];
 105         int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
 106         float coefs[MAX_CHANNELS][BLOCK_MAX_SIZE];
 107         float output[BLOCK_MAX_SIZE * 2];
 108         struct mdct_context *mdct_ctx[BLOCK_NB_SIZES];
 109         float *windows[BLOCK_NB_SIZES];
 110         /** Output buffer for one frame and the last for IMDCT windowing. */
 111         float frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
 112         /** Last frame info. */
 113         uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
 114         int last_bitoffset;
 115         int last_superframe_len;
 116         float noise_table[NOISE_TAB_SIZE];
 117         int noise_index;
 118         float noise_mult;       /* XXX: suppress that and integrate it in the noise array */
 119         /* lsp_to_curve tables */
 120         float lsp_cos_table[BLOCK_MAX_SIZE];
 121         float lsp_pow_e_table[256];
 122         float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
 123         float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
 124 };
 125
 126 #define EXPVLCBITS 8
 127 #define HGAINVLCBITS 9
 128 #define VLCBITS 9
 129
 130 /** \cond sine_winows */
 131
 132 #define SINE_WINDOW(x) static float sine_ ## x[x] __a_aligned(16)
 133
 134 SINE_WINDOW(128);
 135 SINE_WINDOW(256);
 136 SINE_WINDOW(512);
 137 SINE_WINDOW(1024);
 138 SINE_WINDOW(2048);
 139 SINE_WINDOW(4096);
 140
 141 static float *sine_windows[6] = {
 142         sine_128, sine_256, sine_512, sine_1024, sine_2048, sine_4096
 143 };
 144 /** \endcond sine_windows */
 145
 146 /* Generate a sine window. */
 147 static void sine_window_init(float *window, int n)
 148 {
 149         int i;
 150
 151         for (i = 0; i < n; i++)
 152                 window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n)));
 153 }
 154
 155 static void init_coef_vlc(struct private_wmadec_data *pwd, int sidx, int didx)
 156 {
 157         const struct coef_vlc_table *src = coef_vlcs + sidx;
 158         struct vlc *dst = pwd->coef_vlc + didx;
 159         int i, l, j, k, level, n = src->n;
 160
 161         init_vlc(dst, VLCBITS, n, src->huffbits, src->huffcodes, 4);
 162         pwd->run_table[didx] = arr_alloc(n, sizeof(uint16_t));
 163         pwd->level_table[didx] = arr_alloc(n, sizeof(uint16_t));
 164         i = 2;
 165         level = 1;
 166         k = 0;
 167         while (i < n) {
 168                 l = src->levels[k++];
 169                 for (j = 0; j < l; j++) {
 170                         pwd->run_table[didx][i] = j;
 171                         pwd->level_table[didx][i] = level;
 172                         i++;
 173                 }
 174                 level++;
 175         }
 176 }
 177
 178 /* compute the scale factor band sizes for each MDCT block size */
 179 static void compute_scale_factor_band_sizes(struct private_wmadec_data *pwd,
 180         float high_freq)
 181 {
 182         struct asf_header_info *ahi = &pwd->ahi;
 183         int a, b, pos, lpos, k, block_len, i, j, n;
 184         const uint8_t *table;
 185
 186         for (k = 0; k < pwd->nb_block_sizes; k++) {
 187                 int exponent_size;
 188
 189                 block_len = pwd->frame_len >> k;
 190                 table = NULL;
 191                 a = pwd->frame_len_bits - BLOCK_MIN_BITS - k;
 192                 if (a < 3) {
 193                         if (ahi->sample_rate >= 44100)
 194                                 table = exponent_band_44100[a];
 195                         else if (ahi->sample_rate >= 32000)
 196                                 table = exponent_band_32000[a];
 197                         else if (ahi->sample_rate >= 22050)
 198                                 table = exponent_band_22050[a];
 199                 }
 200                 if (table) {
 201                         n = *table++;
 202                         for (i = 0; i < n; i++)
 203                                 pwd->exponent_bands[k][i] = table[i];
 204                         exponent_size = n;
 205                 } else {
 206                         j = 0;
 207                         lpos = 0;
 208                         for (i = 0; i < 25; i++) {
 209                                 a = wma_critical_freqs[i];
 210                                 b = ahi->sample_rate;
 211                                 pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
 212                                 pos <<= 2;
 213                                 if (pos > block_len)
 214                                         pos = block_len;
 215                                 if (pos > lpos)
 216                                         pwd->exponent_bands[k][j++] = pos - lpos;
 217                                 if (pos >= block_len)
 218                                         break;
 219                                 lpos = pos;
 220                         }
 221                         exponent_size = j;
 222                 }
 223
 224                 /* max number of coefs */
 225                 pwd->coefs_end[k] = (pwd->frame_len - ((pwd->frame_len * 9) / 100)) >> k;
 226                 /* high freq computation */
 227                 pwd->high_band_start[k] = (int) ((block_len * 2 * high_freq)
 228                         / ahi->sample_rate + 0.5);
 229                 n = exponent_size;
 230                 j = 0;
 231                 pos = 0;
 232                 for (i = 0; i < n; i++) {
 233                         int start, end;
 234                         start = pos;
 235                         pos += pwd->exponent_bands[k][i];
 236                         end = pos;
 237                         if (start < pwd->high_band_start[k])
 238                                 start = pwd->high_band_start[k];
 239                         if (end > pwd->coefs_end[k])
 240                                 end = pwd->coefs_end[k];
 241                         if (end > start)
 242                                 pwd->exponent_high_bands[k][j++] = end - start;
 243                 }
 244                 pwd->exponent_high_sizes[k] = j;
 245         }
 246 }
 247
 248 static int wma_init(struct private_wmadec_data *pwd)
 249 {
 250         int i;
 251         float bps1, high_freq;
 252         volatile float bps;
 253         int sample_rate1;
 254         int coef_vlc_table;
 255         struct asf_header_info *ahi = &pwd->ahi;
 256         int flags2 = ahi->flags2;
 257
 258         if (ahi->sample_rate <= 0 || ahi->sample_rate > 50000
 259                 || ahi->channels <= 0 || ahi->channels > 8
 260                 || ahi->bit_rate <= 0)
 261                 return -E_WMA_BAD_PARAMS;
 262
 263         /* compute MDCT block size */
 264         if (ahi->sample_rate <= 16000)
 265                 pwd->frame_len_bits = 9;
 266         else if (ahi->sample_rate <= 22050)
 267                 pwd->frame_len_bits = 10;
 268         else
 269                 pwd->frame_len_bits = 11;
 270         pwd->frame_len = 1 << pwd->frame_len_bits;
 271         if (pwd->ahi.use_variable_block_len) {
 272                 int nb_max, nb;
 273                 nb = ((flags2 >> 3) & 3) + 1;
 274                 if ((ahi->bit_rate / ahi->channels) >= 32000)
 275                         nb += 2;
 276                 nb_max = pwd->frame_len_bits - BLOCK_MIN_BITS;
 277                 if (nb > nb_max)
 278                         nb = nb_max;
 279                 pwd->nb_block_sizes = nb + 1;
 280         } else
 281                 pwd->nb_block_sizes = 1;
 282
 283         /* init rate dependent parameters */
 284         pwd->use_noise_coding = 1;
 285         high_freq = ahi->sample_rate * 0.5;
 286
 287         /* wma2 rates are normalized */
 288         sample_rate1 = ahi->sample_rate;
 289         if (sample_rate1 >= 44100)
 290                 sample_rate1 = 44100;
 291         else if (sample_rate1 >= 22050)
 292                 sample_rate1 = 22050;
 293         else if (sample_rate1 >= 16000)
 294                 sample_rate1 = 16000;
 295         else if (sample_rate1 >= 11025)
 296                 sample_rate1 = 11025;
 297         else if (sample_rate1 >= 8000)
 298                 sample_rate1 = 8000;
 299
 300         bps = (float) ahi->bit_rate / (float) (ahi->channels * ahi->sample_rate);
 301         pwd->byte_offset_bits = wma_log2((int) (bps * pwd->frame_len / 8.0 + 0.5)) + 2;
 302         /*
 303          * Compute high frequency value and choose if noise coding should be
 304          * activated.
 305          */
 306         bps1 = bps;
 307         if (ahi->channels == 2)
 308                 bps1 = bps * 1.6;
 309         if (sample_rate1 == 44100) {
 310                 if (bps1 >= 0.61)
 311                         pwd->use_noise_coding = 0;
 312                 else
 313                         high_freq = high_freq * 0.4;
 314         } else if (sample_rate1 == 22050) {
 315                 if (bps1 >= 1.16)
 316                         pwd->use_noise_coding = 0;
 317                 else if (bps1 >= 0.72)
 318                         high_freq = high_freq * 0.7;
 319                 else
 320                         high_freq = high_freq * 0.6;
 321         } else if (sample_rate1 == 16000) {
 322                 if (bps > 0.5)
 323                         high_freq = high_freq * 0.5;
 324                 else
 325                         high_freq = high_freq * 0.3;
 326         } else if (sample_rate1 == 11025)
 327                 high_freq = high_freq * 0.7;
 328         else if (sample_rate1 == 8000) {
 329                 if (bps <= 0.625)
 330                         high_freq = high_freq * 0.5;
 331                 else if (bps > 0.75)
 332                         pwd->use_noise_coding = 0;
 333                 else
 334                         high_freq = high_freq * 0.65;
 335         } else {
 336                 if (bps >= 0.8)
 337                         high_freq = high_freq * 0.75;
 338                 else if (bps >= 0.6)
 339                         high_freq = high_freq * 0.6;
 340                 else
 341                         high_freq = high_freq * 0.5;
 342         }
 343         PARA_INFO_LOG("channels=%u sample_rate=%u "
 344                 "bitrate=%u block_align=%d\n",
 345                 ahi->channels, ahi->sample_rate,
 346                 ahi->bit_rate, ahi->block_align);
 347         PARA_INFO_LOG("frame_len=%d, bps=%f bps1=%f "
 348                 "high_freq=%f bitoffset=%d\n",
 349                 pwd->frame_len, bps, bps1,
 350                 high_freq, pwd->byte_offset_bits);
 351         PARA_INFO_LOG("use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
 352                 pwd->use_noise_coding, pwd->ahi.use_exp_vlc, pwd->nb_block_sizes);
 353
 354         compute_scale_factor_band_sizes(pwd, high_freq);
 355         /* init MDCT windows : simple sinus window */
 356         for (i = 0; i < pwd->nb_block_sizes; i++) {
 357                 int n;
 358                 n = 1 << (pwd->frame_len_bits - i);
 359                 sine_window_init(sine_windows[pwd->frame_len_bits - i - 7], n);
 360                 pwd->windows[i] = sine_windows[pwd->frame_len_bits - i - 7];
 361         }
 362
 363         pwd->reset_block_lengths = true;
 364
 365         if (pwd->use_noise_coding) {
 366                 /* init the noise generator */
 367                 if (pwd->ahi.use_exp_vlc)
 368                         pwd->noise_mult = 0.02;
 369                 else
 370                         pwd->noise_mult = 0.04;
 371
 372                 {
 373                         unsigned int seed;
 374                         float norm;
 375                         seed = 1;
 376                         norm = (1.0 / (float) (1LL << 31)) * sqrt(3) * pwd->noise_mult;
 377                         for (i = 0; i < NOISE_TAB_SIZE; i++) {
 378                                 seed = seed * 314159 + 1;
 379                                 pwd->noise_table[i] = (float) ((int) seed) * norm;
 380                         }
 381                 }
 382         }
 383
 384         /* choose the VLC tables for the coefficients */
 385         coef_vlc_table = 4;
 386         if (ahi->sample_rate >= 32000) {
 387                 if (bps1 < 0.72)
 388                         coef_vlc_table = 0;
 389                 else if (bps1 < 1.16)
 390                         coef_vlc_table = 2;
 391         }
 392         init_coef_vlc(pwd, coef_vlc_table, 0);
 393         init_coef_vlc(pwd, coef_vlc_table + 1, 1);
 394         return 0;
 395 }
 396
 397 static void wma_lsp_to_curve_init(struct private_wmadec_data *pwd)
 398 {
 399         float wdel, a, b;
 400         int i, e, m;
 401
 402         wdel = M_PI / pwd->frame_len;
 403         for (i = 0; i < pwd->frame_len; i++)
 404                 pwd->lsp_cos_table[i] = 2.0f * cos(wdel * i);
 405
 406         /* tables for x^-0.25 computation */
 407         for (i = 0; i < 256; i++) {
 408                 e = i - 126;
 409                 pwd->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
 410         }
 411
 412         /* These two tables are needed to avoid two operations in pow_m1_4. */
 413         b = 1.0;
 414         for (i = (1 << LSP_POW_BITS) - 1; i >= 0; i--) {
 415                 m = (1 << LSP_POW_BITS) + i;
 416                 a = (float) m *(0.5 / (1 << LSP_POW_BITS));
 417                 a = pow(a, -0.25);
 418                 pwd->lsp_pow_m_table1[i] = 2 * a - b;
 419                 pwd->lsp_pow_m_table2[i] = b - a;
 420                 b = a;
 421         }
 422 }
 423
 424 static int wma_decode_init(char *initial_buf, int len, struct private_wmadec_data **result)
 425 {
 426         struct private_wmadec_data *pwd;
 427         int ret, i;
 428
 429         PARA_NOTICE_LOG("initial buf: %d bytes\n", len);
 430         pwd = zalloc(sizeof(*pwd));
 431         ret = read_asf_header(initial_buf, len, &pwd->ahi);
 432         if (ret <= 0) {
 433                 free(pwd);
 434                 return ret;
 435         }
 436
 437         ret = wma_init(pwd);
 438         if (ret < 0)
 439                 return ret;
 440         /* init MDCT */
 441         for (i = 0; i < pwd->nb_block_sizes; i++) {
 442                 ret = imdct_init(pwd->frame_len_bits - i + 1, &pwd->mdct_ctx[i]);
 443                 if (ret < 0)
 444                         return ret;
 445         }
 446         if (pwd->use_noise_coding) {
 447                 PARA_INFO_LOG("using noise coding\n");
 448                 init_vlc(&pwd->hgain_vlc, HGAINVLCBITS,
 449                         sizeof(wma_hgain_huffbits), wma_hgain_huffbits,
 450                         wma_hgain_huffcodes, 2);
 451         }
 452
 453         if (pwd->ahi.use_exp_vlc) {
 454                 PARA_INFO_LOG("using exp_vlc\n");
 455                 init_vlc(&pwd->exp_vlc, EXPVLCBITS, sizeof(wma_scale_huffbits),
 456                         wma_scale_huffbits, wma_scale_huffcodes, 4);
 457         } else {
 458                 PARA_INFO_LOG("using curve\n");
 459                 wma_lsp_to_curve_init(pwd);
 460         }
 461         *result = pwd;
 462         return pwd->ahi.header_len;
 463 }
 464
 465 /**
 466  * compute x^-0.25 with an exponent and mantissa table. We use linear
 467  * interpolation to reduce the mantissa table size at a small speed
 468  * expense (linear interpolation approximately doubles the number of
 469  * bits of precision).
 470  */
 471 static inline float pow_m1_4(struct private_wmadec_data *pwd, float x)
 472 {
 473         union {
 474                 float f;
 475                 unsigned int v;
 476         } u, t;
 477         unsigned int e, m;
 478         float a, b;
 479
 480         u.f = x;
 481         e = u.v >> 23;
 482         m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
 483         /* build interpolation scale: 1 <= t < 2. */
 484         t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
 485         a = pwd->lsp_pow_m_table1[m];
 486         b = pwd->lsp_pow_m_table2[m];
 487         return pwd->lsp_pow_e_table[e] * (a + b * t.f);
 488 }
 489
 490 static void wma_lsp_to_curve(struct private_wmadec_data *pwd,
 491                 float *out, float *val_max_ptr, int n, float *lsp)
 492 {
 493         int i, j;
 494         float p, q, w, v, val_max;
 495
 496         val_max = 0;
 497         for (i = 0; i < n; i++) {
 498                 p = 0.5f;
 499                 q = 0.5f;
 500                 w = pwd->lsp_cos_table[i];
 501                 for (j = 1; j < NB_LSP_COEFS; j += 2) {
 502                         q *= w - lsp[j - 1];
 503                         p *= w - lsp[j];
 504                 }
 505                 p *= p * (2.0f - w);
 506                 q *= q * (2.0f + w);
 507                 v = p + q;
 508                 v = pow_m1_4(pwd, v);
 509                 if (v > val_max)
 510                         val_max = v;
 511                 out[i] = v;
 512         }
 513         *val_max_ptr = val_max;
 514 }
 515
 516 /* Decode exponents coded with LSP coefficients (same idea as Vorbis). */
 517 static void decode_exp_lsp(struct private_wmadec_data *pwd, int ch)
 518 {
 519         float lsp_coefs[NB_LSP_COEFS];
 520         int val, i;
 521
 522         for (i = 0; i < NB_LSP_COEFS; i++) {
 523                 if (i == 0 || i >= 8)
 524                         val = get_bits(&pwd->gb, 3);
 525                 else
 526                         val = get_bits(&pwd->gb, 4);
 527                 lsp_coefs[i] = wma_lsp_codebook[i][val];
 528         }
 529
 530         wma_lsp_to_curve(pwd, pwd->exponents[ch], &pwd->max_exponent[ch],
 531                 pwd->block_len, lsp_coefs);
 532 }
 533
 534 /* Decode exponents coded with VLC codes. */
 535 static int decode_exp_vlc(struct private_wmadec_data *pwd, int ch)
 536 {
 537         int last_exp, n, code;
 538         const uint16_t *ptr, *band_ptr;
 539         float v, *q, max_scale, *q_end;
 540
 541         band_ptr = pwd->exponent_bands[pwd->frame_len_bits - pwd->block_len_bits];
 542         ptr = band_ptr;
 543         q = pwd->exponents[ch];
 544         q_end = q + pwd->block_len;
 545         max_scale = 0;
 546         last_exp = 36;
 547
 548         while (q < q_end) {
 549                 code = get_vlc(&pwd->gb, &pwd->exp_vlc);
 550                 if (code < 0)
 551                         return code;
 552                 /* NOTE: this offset is the same as MPEG4 AAC ! */
 553                 last_exp += code - 60;
 554                 /* XXX: use a table */
 555                 v = pow(10, last_exp * (1.0 / 16.0));
 556                 if (v > max_scale)
 557                         max_scale = v;
 558                 n = *ptr++;
 559                 do {
 560                         *q++ = v;
 561                 } while (--n);
 562         }
 563         pwd->max_exponent[ch] = max_scale;
 564         return 0;
 565 }
 566
 567 /* compute src0 * src1 + src2 */
 568 static inline void vector_mult_add(float *dst, const float *src0, const float *src1,
 569                 const float *src2, int len)
 570 {
 571         int i;
 572
 573         for (i = 0; i < len; i++)
 574                 dst[i] = src0[i] * src1[i] + src2[i];
 575 }
 576
 577 static inline void vector_mult_reverse(float *dst, const float *src0,
 578                 const float *src1, int len)
 579 {
 580         int i;
 581
 582         src1 += len - 1;
 583         for (i = 0; i < len; i++)
 584                 dst[i] = src0[i] * src1[-i];
 585 }
 586
 587 /**
 588  * Apply MDCT window and add into output.
 589  *
 590  * We ensure that when the windows overlap their squared sum
 591  * is always 1 (MDCT reconstruction rule).
 592  */
 593 static void wma_window(struct private_wmadec_data *pwd, float *out)
 594 {
 595         float *in = pwd->output;
 596         int block_len, bsize, n;
 597
 598         /* left part */
 599         if (pwd->block_len_bits <= pwd->prev_block_len_bits) {
 600                 block_len = pwd->block_len;
 601                 bsize = pwd->frame_len_bits - pwd->block_len_bits;
 602                 vector_mult_add(out, in, pwd->windows[bsize], out, block_len);
 603         } else {
 604                 block_len = 1 << pwd->prev_block_len_bits;
 605                 n = (pwd->block_len - block_len) / 2;
 606                 bsize = pwd->frame_len_bits - pwd->prev_block_len_bits;
 607                 vector_mult_add(out + n, in + n, pwd->windows[bsize], out + n,
 608                         block_len);
 609                 memcpy(out + n + block_len, in + n + block_len,
 610                         n * sizeof(float));
 611         }
 612         out += pwd->block_len;
 613         in += pwd->block_len;
 614         /* right part */
 615         if (pwd->block_len_bits <= pwd->next_block_len_bits) {
 616                 block_len = pwd->block_len;
 617                 bsize = pwd->frame_len_bits - pwd->block_len_bits;
 618                 vector_mult_reverse(out, in, pwd->windows[bsize], block_len);
 619         } else {
 620                 block_len = 1 << pwd->next_block_len_bits;
 621                 n = (pwd->block_len - block_len) / 2;
 622                 bsize = pwd->frame_len_bits - pwd->next_block_len_bits;
 623                 memcpy(out, in, n * sizeof(float));
 624                 vector_mult_reverse(out + n, in + n, pwd->windows[bsize],
 625                         block_len);
 626                 memset(out + n + block_len, 0, n * sizeof(float));
 627         }
 628 }
 629
 630 static int wma_total_gain_to_bits(int total_gain)
 631 {
 632         if (total_gain < 15)
 633                 return 13;
 634         else if (total_gain < 32)
 635                 return 12;
 636         else if (total_gain < 40)
 637                 return 11;
 638         else if (total_gain < 45)
 639                 return 10;
 640         else
 641                 return 9;
 642 }
 643
 644 static int compute_high_band_values(struct private_wmadec_data *pwd,
 645                 int bsize, int nb_coefs[MAX_CHANNELS])
 646 {
 647         int ch;
 648
 649         if (!pwd->use_noise_coding)
 650                 return 0;
 651         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 652                 int i, m, a;
 653                 if (!pwd->channel_coded[ch])
 654                         continue;
 655                 m = pwd->exponent_high_sizes[bsize];
 656                 for (i = 0; i < m; i++) {
 657                         a = get_bit(&pwd->gb);
 658                         pwd->high_band_coded[ch][i] = a;
 659                         if (!a)
 660                                 continue;
 661                         nb_coefs[ch] -= pwd->exponent_high_bands[bsize][i];
 662                 }
 663         }
 664         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 665                 int i, n, val;
 666                 if (!pwd->channel_coded[ch])
 667                         continue;
 668                 n = pwd->exponent_high_sizes[bsize];
 669                 val = (int)0x80000000;
 670                 for (i = 0; i < n; i++) {
 671                         if (!pwd->high_band_coded[ch][i])
 672                                 continue;
 673                         if (val == (int)0x80000000)
 674                                 val = get_bits(&pwd->gb, 7) - 19;
 675                         else {
 676                                 int code = get_vlc(&pwd->gb, &pwd->hgain_vlc);
 677                                 if (code < 0)
 678                                         return code;
 679                                 val += code - 18;
 680                         }
 681                         pwd->high_band_values[ch][i] = val;
 682                 }
 683         }
 684         return 1;
 685 }
 686
 687 static void compute_mdct_coefficients(struct private_wmadec_data *pwd,
 688                 int bsize, int total_gain, int nb_coefs[MAX_CHANNELS])
 689 {
 690         int ch;
 691         float mdct_norm = 1.0 / (pwd->block_len / 2);
 692
 693         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 694                 int16_t *coefs1;
 695                 float *coefs, *exponents, mult, mult1, noise;
 696                 int i, j, n, n1, last_high_band, esize;
 697                 float exp_power[HIGH_BAND_MAX_SIZE];
 698
 699                 if (!pwd->channel_coded[ch])
 700                         continue;
 701                 coefs1 = pwd->coefs1[ch];
 702                 exponents = pwd->exponents[ch];
 703                 esize = pwd->exponents_bsize[ch];
 704                 mult = pow(10, total_gain * 0.05) / pwd->max_exponent[ch];
 705                 mult *= mdct_norm;
 706                 coefs = pwd->coefs[ch];
 707                 if (!pwd->use_noise_coding) {
 708                         /* XXX: optimize more */
 709                         n = nb_coefs[ch];
 710                         for (i = 0; i < n; i++)
 711                                 *coefs++ = coefs1[i] *
 712                                         exponents[i << bsize >> esize] * mult;
 713                         n = pwd->block_len - pwd->coefs_end[bsize];
 714                         for (i = 0; i < n; i++)
 715                                 *coefs++ = 0.0;
 716                         continue;
 717                 }
 718                 n1 = pwd->exponent_high_sizes[bsize];
 719                 /* compute power of high bands */
 720                 exponents = pwd->exponents[ch] +
 721                         (pwd->high_band_start[bsize] << bsize);
 722                 last_high_band = 0; /* avoid warning */
 723                 for (j = 0; j < n1; j++) {
 724                         n = pwd->exponent_high_bands[
 725                                 pwd->frame_len_bits - pwd->block_len_bits][j];
 726                         if (pwd->high_band_coded[ch][j]) {
 727                                 float e2, val;
 728                                 e2 = 0;
 729                                 for (i = 0; i < n; i++) {
 730                                         val = exponents[i << bsize >> esize];
 731                                         e2 += val * val;
 732                                 }
 733                                 exp_power[j] = e2 / n;
 734                                 last_high_band = j;
 735                         }
 736                         exponents += n << bsize;
 737                 }
 738                 /* main freqs and high freqs */
 739                 exponents = pwd->exponents[ch];
 740                 for (j = -1; j < n1; j++) {
 741                         if (j < 0)
 742                                 n = pwd->high_band_start[bsize];
 743                         else
 744                                 n = pwd->exponent_high_bands[pwd->frame_len_bits
 745                                         - pwd->block_len_bits][j];
 746                         if (j >= 0 && pwd->high_band_coded[ch][j]) {
 747                                 /* use noise with specified power */
 748                                 mult1 = sqrt(exp_power[j]
 749                                         / exp_power[last_high_band]);
 750                                 /* XXX: use a table */
 751                                 mult1 *= pow(10, pwd->high_band_values[ch][j] * 0.05);
 752                                 mult1 /= (pwd->max_exponent[ch] * pwd->noise_mult);
 753                                 mult1 *= mdct_norm;
 754                                 for (i = 0; i < n; i++) {
 755                                         noise = pwd->noise_table[pwd->noise_index];
 756                                         pwd->noise_index = (pwd->noise_index + 1)
 757                                                 & (NOISE_TAB_SIZE - 1);
 758                                         *coefs++ = noise * exponents[
 759                                                 i << bsize >> esize] * mult1;
 760                                 }
 761                                 exponents += n << bsize;
 762                         } else {
 763                                 /* coded values + small noise */
 764                                 for (i = 0; i < n; i++) {
 765                                         noise = pwd->noise_table[pwd->noise_index];
 766                                         pwd->noise_index = (pwd->noise_index + 1)
 767                                                 & (NOISE_TAB_SIZE - 1);
 768                                         *coefs++ = ((*coefs1++) + noise) *
 769                                                 exponents[i << bsize >> esize]
 770                                                 * mult;
 771                                 }
 772                                 exponents += n << bsize;
 773                         }
 774                 }
 775                 /* very high freqs: noise */
 776                 n = pwd->block_len - pwd->coefs_end[bsize];
 777                 mult1 = mult * exponents[(-(1 << bsize)) >> esize];
 778                 for (i = 0; i < n; i++) {
 779                         *coefs++ = pwd->noise_table[pwd->noise_index] * mult1;
 780                         pwd->noise_index = (pwd->noise_index + 1)
 781                                 & (NOISE_TAB_SIZE - 1);
 782                 }
 783         }
 784 }
 785
 786 /**
 787  * Returns 0 if OK, 1 if last block of frame, negative on uncorrectable
 788  * errors.
 789  */
 790 static int wma_decode_block(struct private_wmadec_data *pwd)
 791 {
 792         int ret, n, v, ch, code, bsize;
 793         int coef_nb_bits, total_gain;
 794         int nb_coefs[MAX_CHANNELS];
 795         bool ms_stereo = false; /* mid/side stereo mode */
 796
 797         /* compute current block length */
 798         if (pwd->ahi.use_variable_block_len) {
 799                 n = wma_log2(pwd->nb_block_sizes - 1) + 1;
 800
 801                 if (pwd->reset_block_lengths) {
 802                         pwd->reset_block_lengths = false;
 803                         v = get_bits(&pwd->gb, n);
 804                         if (v >= pwd->nb_block_sizes)
 805                                 return -E_WMA_BLOCK_SIZE;
 806                         pwd->prev_block_len_bits = pwd->frame_len_bits - v;
 807                         v = get_bits(&pwd->gb, n);
 808                         if (v >= pwd->nb_block_sizes)
 809                                 return -E_WMA_BLOCK_SIZE;
 810                         pwd->block_len_bits = pwd->frame_len_bits - v;
 811                 } else {
 812                         /* update block lengths */
 813                         pwd->prev_block_len_bits = pwd->block_len_bits;
 814                         pwd->block_len_bits = pwd->next_block_len_bits;
 815                 }
 816                 v = get_bits(&pwd->gb, n);
 817                 if (v >= pwd->nb_block_sizes)
 818                         return -E_WMA_BLOCK_SIZE;
 819                 pwd->next_block_len_bits = pwd->frame_len_bits - v;
 820         } else {
 821                 /* fixed block len */
 822                 pwd->next_block_len_bits = pwd->frame_len_bits;
 823                 pwd->prev_block_len_bits = pwd->frame_len_bits;
 824                 pwd->block_len_bits = pwd->frame_len_bits;
 825         }
 826
 827         /* now check if the block length is coherent with the frame length */
 828         pwd->block_len = 1 << pwd->block_len_bits;
 829         if ((pwd->block_pos + pwd->block_len) > pwd->frame_len)
 830                 return -E_INCOHERENT_BLOCK_LEN;
 831
 832         if (pwd->ahi.channels == 2)
 833                 ms_stereo = get_bit(&pwd->gb);
 834         v = 0;
 835         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 836                 int a = get_bit(&pwd->gb);
 837                 pwd->channel_coded[ch] = a;
 838                 v |= a;
 839         }
 840
 841         bsize = pwd->frame_len_bits - pwd->block_len_bits;
 842
 843         /* if no channel coded, no need to go further */
 844         /* XXX: fix potential framing problems */
 845         if (!v)
 846                 goto next;
 847
 848         /*
 849          * Read total gain and extract corresponding number of bits for coef
 850          * escape coding.
 851          */
 852         total_gain = 1;
 853         for (;;) {
 854                 int a = get_bits(&pwd->gb, 7);
 855                 total_gain += a;
 856                 if (a != 127)
 857                         break;
 858         }
 859
 860         coef_nb_bits = wma_total_gain_to_bits(total_gain);
 861
 862         /* compute number of coefficients */
 863         n = pwd->coefs_end[bsize];
 864         for (ch = 0; ch < pwd->ahi.channels; ch++)
 865                 nb_coefs[ch] = n;
 866
 867         ret = compute_high_band_values(pwd, bsize, nb_coefs);
 868         if (ret < 0)
 869                 return ret;
 870
 871         /* exponents can be reused in short blocks. */
 872         if ((pwd->block_len_bits == pwd->frame_len_bits) || get_bit(&pwd->gb)) {
 873                 for (ch = 0; ch < pwd->ahi.channels; ch++) {
 874                         if (pwd->channel_coded[ch]) {
 875                                 if (pwd->ahi.use_exp_vlc) {
 876                                         ret = decode_exp_vlc(pwd, ch);
 877                                         if (ret < 0)
 878                                                 return ret;
 879                                 } else
 880                                         decode_exp_lsp(pwd, ch);
 881                                 pwd->exponents_bsize[ch] = bsize;
 882                         }
 883                 }
 884         }
 885
 886         /* parse spectral coefficients : just RLE encoding */
 887         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 888                 struct vlc *coef_vlc;
 889                 int level, run, tindex;
 890                 int16_t *ptr, *eptr;
 891                 const uint16_t *level_table, *run_table;
 892
 893                 if (!pwd->channel_coded[ch])
 894                         continue;
 895                 /*
 896                  * special VLC tables are used for ms stereo because there is
 897                  * potentially less energy there
 898                  */
 899                 tindex = ch == 1 && ms_stereo;
 900                 coef_vlc = &pwd->coef_vlc[tindex];
 901                 run_table = pwd->run_table[tindex];
 902                 level_table = pwd->level_table[tindex];
 903                 /* XXX: optimize */
 904                 ptr = &pwd->coefs1[ch][0];
 905                 eptr = ptr + nb_coefs[ch];
 906                 memset(ptr, 0, pwd->block_len * sizeof(int16_t));
 907                 for (;;) {
 908                         code = get_vlc(&pwd->gb, coef_vlc);
 909                         if (code < 0)
 910                                 return code;
 911                         if (code == 1) /* EOB */
 912                                 break;
 913                         if (code == 0) { /* escape */
 914                                 level = get_bits(&pwd->gb, coef_nb_bits);
 915                                 /* reading block_len_bits would be better */
 916                                 run = get_bits(&pwd->gb, pwd->frame_len_bits);
 917                         } else { /* normal code */
 918                                 run = run_table[code];
 919                                 level = level_table[code];
 920                         }
 921                         if (!get_bit(&pwd->gb))
 922                                 level = -level;
 923                         ptr += run;
 924                         if (ptr >= eptr) {
 925                                 PARA_ERROR_LOG("overflow in spectral RLE, ignoring\n");
 926                                 break;
 927                         }
 928                         *ptr++ = level;
 929                         if (ptr >= eptr) /* EOB can be omitted */
 930                                 break;
 931                 }
 932         }
 933         compute_mdct_coefficients(pwd, bsize, total_gain, nb_coefs);
 934         if (ms_stereo && pwd->channel_coded[1]) {
 935                 float a, b;
 936                 int i;
 937                 /*
 938                  * Nominal case for ms stereo: we do it before mdct.
 939                  *
 940                  * No need to optimize this case because it should almost never
 941                  * happen.
 942                  */
 943                 if (!pwd->channel_coded[0]) {
 944                         PARA_NOTICE_LOG("rare ms-stereo\n");
 945                         memset(pwd->coefs[0], 0, sizeof(float) * pwd->block_len);
 946                         pwd->channel_coded[0] = 1;
 947                 }
 948                 for (i = 0; i < pwd->block_len; i++) {
 949                         a = pwd->coefs[0][i];
 950                         b = pwd->coefs[1][i];
 951                         pwd->coefs[0][i] = a + b;
 952                         pwd->coefs[1][i] = a - b;
 953                 }
 954         }
 955 next:
 956         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 957                 int n4, idx;
 958
 959                 n4 = pwd->block_len / 2;
 960                 if (pwd->channel_coded[ch])
 961                         imdct(pwd->mdct_ctx[bsize], pwd->output, pwd->coefs[ch]);
 962                 else if (!(ms_stereo && ch == 1))
 963                         memset(pwd->output, 0, sizeof(pwd->output));
 964
 965                 /* multiply by the window and add in the frame */
 966                 idx = (pwd->frame_len / 2) + pwd->block_pos - n4;
 967                 wma_window(pwd, &pwd->frame_out[ch][idx]);
 968         }
 969
 970         /* update block number */
 971         pwd->block_pos += pwd->block_len;
 972         if (pwd->block_pos >= pwd->frame_len)
 973                 return 1;
 974         else
 975                 return 0;
 976 }
 977
 978 /*
 979  * Clip a signed integer value into the -32768,32767 range.
 980  *
 981  * \param a The value to clip.
 982  *
 983  * \return The clipped value.
 984  */
 985 static inline int16_t av_clip_int16(int a)
 986 {
 987         if ((a + 32768) & ~65535)
 988                 return (a >> 31) ^ 32767;
 989         else
 990                 return a;
 991 }
 992
 993 /* Decode a frame of frame_len samples. */
 994 static int wma_decode_frame(struct private_wmadec_data *pwd, int16_t *samples)
 995 {
 996         int ret, i, ch;
 997         int16_t *ptr;
 998         float *iptr;
 999
1000         /* read each block */
1001         pwd->block_pos = 0;
1002         for (;;) {
1003                 ret = wma_decode_block(pwd);
1004                 if (ret < 0)
1005                         return ret;
1006                 if (ret)
1007                         break;
1008         }
1009
1010         /* convert frame to integer */
1011         for (ch = 0; ch < pwd->ahi.channels; ch++) {
1012                 ptr = samples + ch;
1013                 iptr = pwd->frame_out[ch];
1014
1015                 for (i = 0; i < pwd->frame_len; i++) {
1016                         *ptr = av_clip_int16(lrintf(*iptr++));
1017                         ptr += pwd->ahi.channels;
1018                 }
1019                 /* prepare for next block */
1020                 memmove(&pwd->frame_out[ch][0], &pwd->frame_out[ch][pwd->frame_len],
1021                         pwd->frame_len * sizeof(float));
1022         }
1023         return 0;
1024 }
1025
1026 static int wma_decode_superframe(struct private_wmadec_data *pwd, void *out,
1027                 int *out_size, const uint8_t *in)
1028 {
1029         int ret, in_size = pwd->ahi.packet_size - WMA_FRAME_SKIP;
1030         int16_t *samples = out;
1031
1032         init_get_bits(&pwd->gb, in, in_size);
1033         if (pwd->ahi.use_bit_reservoir) {
1034                 int i, nb_frames, bit_offset, pos, len;
1035                 uint8_t *q;
1036
1037                 /* read super frame header */
1038                 skip_bits(&pwd->gb, 4); /* super frame index */
1039                 nb_frames = get_bits(&pwd->gb, 4) - 1;
1040                 // PARA_DEBUG_LOG("have %d frames\n", nb_frames);
1041                 ret = -E_WMA_OUTPUT_SPACE;
1042                 if ((nb_frames + 1) * pwd->ahi.channels * pwd->frame_len
1043                                 * sizeof(int16_t) > *out_size)
1044                         goto fail;
1045
1046                 bit_offset = get_bits(&pwd->gb, pwd->byte_offset_bits + 3);
1047
1048                 if (pwd->last_superframe_len > 0) {
1049                         /* add bit_offset bits to last frame */
1050                         ret = -E_WMA_BAD_SUPERFRAME;
1051                         if ((pwd->last_superframe_len + ((bit_offset + 7) >> 3)) >
1052                                         MAX_CODED_SUPERFRAME_SIZE)
1053                                 goto fail;
1054                         q = pwd->last_superframe + pwd->last_superframe_len;
1055                         len = bit_offset;
1056                         while (len > 7) {
1057                                 *q++ = get_bits(&pwd->gb, 8);
1058                                 len -= 8;
1059                         }
1060                         if (len > 0)
1061                                 *q++ = get_bits(&pwd->gb, len) << (8 - len);
1062
1063                         /* XXX: bit_offset bits into last frame */
1064                         init_get_bits(&pwd->gb, pwd->last_superframe,
1065                                 MAX_CODED_SUPERFRAME_SIZE);
1066                         /* skip unused bits */
1067                         if (pwd->last_bitoffset > 0)
1068                                 skip_bits(&pwd->gb, pwd->last_bitoffset);
1069                         /*
1070                          * This frame is stored in the last superframe and in
1071                          * the current one.
1072                          */
1073                         ret = wma_decode_frame(pwd, samples);
1074                         if (ret < 0)
1075                                 goto fail;
1076                         samples += pwd->ahi.channels * pwd->frame_len;
1077                 }
1078
1079                 /* read each frame starting from bit_offset */
1080                 pos = bit_offset + 4 + 4 + pwd->byte_offset_bits + 3;
1081                 init_get_bits(&pwd->gb, in + (pos >> 3),
1082                         (MAX_CODED_SUPERFRAME_SIZE - (pos >> 3)));
1083                 len = pos & 7;
1084                 if (len > 0)
1085                         skip_bits(&pwd->gb, len);
1086
1087                 pwd->reset_block_lengths = true;
1088                 for (i = 0; i < nb_frames; i++) {
1089                         ret = wma_decode_frame(pwd, samples);
1090                         if (ret < 0)
1091                                 goto fail;
1092                         samples += pwd->ahi.channels * pwd->frame_len;
1093                 }
1094
1095                 /* we copy the end of the frame in the last frame buffer */
1096                 pos = get_bits_count(&pwd->gb) +
1097                         ((bit_offset + 4 + 4 + pwd->byte_offset_bits + 3) & ~7);
1098                 pwd->last_bitoffset = pos & 7;
1099                 pos >>= 3;
1100                 len = in_size - pos;
1101                 ret = -E_WMA_BAD_SUPERFRAME;
1102                 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0)
1103                         goto fail;
1104                 pwd->last_superframe_len = len;
1105                 memcpy(pwd->last_superframe, in + pos, len);
1106         } else {
1107                 PARA_DEBUG_LOG("not using bit reservoir\n");
1108                 ret = -E_WMA_OUTPUT_SPACE;
1109                 if (pwd->ahi.channels * pwd->frame_len * sizeof(int16_t) > *out_size)
1110                         goto fail;
1111                 /* single frame decode */
1112                 ret = wma_decode_frame(pwd, samples);
1113                 if (ret < 0)
1114                         goto fail;
1115                 samples += pwd->ahi.channels * pwd->frame_len;
1116         }
1117         PARA_DEBUG_LOG("frame_len: %d, block_len: %d, outbytes: %d, eaten: %d\n",
1118                 pwd->frame_len, pwd->block_len,
1119                 (int)((int8_t *)samples - (int8_t *)out), pwd->ahi.block_align);
1120         *out_size = (int8_t *)samples - (int8_t *)out;
1121         return pwd->ahi.block_align;
1122 fail:
1123         /* reset the bit reservoir on errors */
1124         pwd->last_superframe_len = 0;
1125         return ret;
1126 }
1127
1128 static void wmadec_close(struct filter_node *fn)
1129 {
1130         struct private_wmadec_data *pwd = fn->private_data;
1131         int i;
1132
1133         if (!pwd)
1134                 return;
1135         for (i = 0; i < pwd->nb_block_sizes; i++)
1136                 imdct_end(pwd->mdct_ctx[i]);
1137         if (pwd->ahi.use_exp_vlc)
1138                 free_vlc(&pwd->exp_vlc);
1139         if (pwd->use_noise_coding)
1140                 free_vlc(&pwd->hgain_vlc);
1141         for (i = 0; i < 2; i++) {
1142                 free_vlc(&pwd->coef_vlc[i]);
1143                 free(pwd->run_table[i]);
1144                 free(pwd->level_table[i]);
1145         }
1146         free(fn->private_data);
1147         fn->private_data = NULL;
1148 }
1149
1150 static int wmadec_execute(struct btr_node *btrn, const char *cmd, char **result)
1151 {
1152         struct filter_node *fn = btr_context(btrn);
1153         struct private_wmadec_data *pwd = fn->private_data;
1154
1155         return decoder_execute(cmd, pwd->ahi.sample_rate, pwd->ahi.channels,
1156                 result);
1157 }
1158
1159 #define WMA_OUTPUT_BUFFER_SIZE (128 * 1024)
1160
1161 static int wmadec_post_monitor(__a_unused struct sched *s, void *context)
1162 {
1163         struct filter_node *fn = context;
1164         int ret, converted, out_size;
1165         struct private_wmadec_data *pwd = fn->private_data;
1166         struct btr_node *btrn = fn->btrn;
1167         size_t len;
1168         char *in, *out;
1169
1170 next_buffer:
1171         converted = 0;
1172         ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
1173         if (ret < 0)
1174                 goto err;
1175         if (ret == 0)
1176                 return 0;
1177         btr_merge(btrn, fn->min_iqs);
1178         len = btr_next_buffer(btrn, &in);
1179         ret = -E_EOF;
1180         if (len < fn->min_iqs)
1181                 goto err;
1182         if (!pwd) {
1183                 ret = wma_decode_init(in, len, &pwd);
1184                 if (ret < 0)
1185                         goto err;
1186                 if (ret == 0) {
1187                         fn->min_iqs += 4096;
1188                         goto next_buffer;
1189                 }
1190                 fn->min_iqs = 2 * pwd->ahi.packet_size;
1191                 fn->private_data = pwd;
1192                 converted = pwd->ahi.header_len;
1193                 goto success;
1194         }
1195         fn->min_iqs = pwd->ahi.packet_size;
1196         if (fn->min_iqs > len)
1197                 goto success;
1198         out_size = WMA_OUTPUT_BUFFER_SIZE;
1199         out = alloc(out_size);
1200         ret = wma_decode_superframe(pwd, out, &out_size,
1201                 (uint8_t *)in + WMA_FRAME_SKIP);
1202         if (ret < 0) {
1203                 free(out);
1204                 goto err;
1205         }
1206         if (out_size > 0) {
1207                 out = para_realloc(out, out_size);
1208                 btr_add_output(out, out_size, btrn);
1209         } else
1210                 free(out);
1211         converted += pwd->ahi.packet_size;
1212 success:
1213         btr_consume(btrn, converted);
1214         return 0;
1215 err:
1216         assert(ret < 0);
1217         btr_remove_node(&fn->btrn);
1218         return ret;
1219 }
1220
1221 static void wmadec_open(struct filter_node *fn)
1222 {
1223         fn->private_data = NULL;
1224         fn->min_iqs = 4096;
1225 }
1226
1227 const struct filter lsg_filter_cmd_com_wmadec_user_data = {
1228         .open = wmadec_open,
1229         .close = wmadec_close,
1230         .execute = wmadec_execute,
1231         .pre_monitor = generic_filter_pre_monitor,
1232         .post_monitor = wmadec_post_monitor,
1233 };