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.
   9  * For licencing details see COPYING.LIB.
  10  */
  11
  12 /** \file wmadec_filter.c paraslash's WMA decoder. */
  13
  14 /*
  15  * This decoder handles Microsoft Windows Media Audio data version 2.
  16  */
  17
  18 #include <math.h>
  19 #include <regex.h>
  20 #include <sys/select.h>
  21
  22 #include "para.h"
  23 #include "error.h"
  24 #include "list.h"
  25 #include "string.h"
  26 #include "sched.h"
  27 #include "buffer_tree.h"
  28 #include "filter.h"
  29 #include "portable_io.h"
  30 #include "bitstream.h"
  31 #include "imdct.h"
  32 #include "wma.h"
  33 #include "wmadata.h"
  34
  35
  36 /* size of blocks */
  37 #define BLOCK_MIN_BITS 7
  38 #define BLOCK_MAX_BITS 11
  39 #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
  40
  41 #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
  42
  43 /* XXX: find exact max size */
  44 #define HIGH_BAND_MAX_SIZE 16
  45
  46 /* XXX: is it a suitable value ? */
  47 #define MAX_CODED_SUPERFRAME_SIZE 16384
  48
  49 #define MAX_CHANNELS 2
  50
  51 #define NOISE_TAB_SIZE 8192
  52
  53 #define LSP_POW_BITS 7
  54
  55 struct private_wmadec_data {
  56         /** Information contained in the audio file header. */
  57         struct asf_header_info ahi;
  58         struct getbit_context gb;
  59         /** Whether perceptual noise is added. */
  60         int use_noise_coding;
  61         /** Depends on number of the bits per second and the frame length. */
  62         int byte_offset_bits;
  63         /** Only used if ahi->use_exp_vlc is true. */
  64         struct vlc exp_vlc;
  65         uint16_t exponent_bands[BLOCK_NB_SIZES][25];
  66         /** The index of the first coef in high band. */
  67         int high_band_start[BLOCK_NB_SIZES];
  68         /** Maximal number of coded coefficients. */
  69         int coefs_end[BLOCK_NB_SIZES];
  70         int exponent_high_sizes[BLOCK_NB_SIZES];
  71         int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
  72         struct vlc hgain_vlc;
  73
  74         /* coded values in high bands */
  75         int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
  76         int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
  77
  78         /* there are two possible tables for spectral coefficients */
  79         struct vlc coef_vlc[2];
  80         uint16_t *run_table[2];
  81         uint16_t *level_table[2];
  82         /** Frame length in samples. */
  83         int frame_len;
  84         /** log2 of frame_len. */
  85         int frame_len_bits;
  86         /** Number of block sizes, one if !ahi->use_variable_block_len. */
  87         int nb_block_sizes;
  88         /* Whether to update block lengths from getbit context. */
  89         bool reset_block_lengths;
  90         /** log2 of current block length. */
  91         int block_len_bits;
  92         /** log2 of next block length. */
  93         int next_block_len_bits;
  94         /** log2 of previous block length. */
  95         int prev_block_len_bits;
  96         /** Block length in samples. */
  97         int block_len;
  98         /** Current position in frame. */
  99         int block_pos;
 100         /** True if channel is coded. */
 101         uint8_t channel_coded[MAX_CHANNELS];
 102         /** log2 ratio frame/exp. length. */
 103         int exponents_bsize[MAX_CHANNELS];
 104
 105         float exponents[MAX_CHANNELS][BLOCK_MAX_SIZE];
 106         float max_exponent[MAX_CHANNELS];
 107         int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
 108         float coefs[MAX_CHANNELS][BLOCK_MAX_SIZE];
 109         float output[BLOCK_MAX_SIZE * 2];
 110         struct mdct_context *mdct_ctx[BLOCK_NB_SIZES];
 111         float *windows[BLOCK_NB_SIZES];
 112         /** Output buffer for one frame and the last for IMDCT windowing. */
 113         float frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
 114         /** Last frame info. */
 115         uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
 116         int last_bitoffset;
 117         int last_superframe_len;
 118         float noise_table[NOISE_TAB_SIZE];
 119         int noise_index;
 120         float noise_mult;       /* XXX: suppress that and integrate it in the noise array */
 121         /* lsp_to_curve tables */
 122         float lsp_cos_table[BLOCK_MAX_SIZE];
 123         float lsp_pow_e_table[256];
 124         float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
 125         float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
 126 };
 127
 128 #define EXPVLCBITS 8
 129 #define HGAINVLCBITS 9
 130 #define VLCBITS 9
 131
 132 /** \cond sine_winows */
 133
 134 #define SINE_WINDOW(x) static float sine_ ## x[x] __a_aligned(16)
 135
 136 SINE_WINDOW(128);
 137 SINE_WINDOW(256);
 138 SINE_WINDOW(512);
 139 SINE_WINDOW(1024);
 140 SINE_WINDOW(2048);
 141 SINE_WINDOW(4096);
 142
 143 static float *sine_windows[6] = {
 144         sine_128, sine_256, sine_512, sine_1024, sine_2048, sine_4096
 145 };
 146 /** \endcond sine_windows */
 147
 148 /* Generate a sine window. */
 149 static void sine_window_init(float *window, int n)
 150 {
 151         int i;
 152
 153         for (i = 0; i < n; i++)
 154                 window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n)));
 155 }
 156
 157 static void init_coef_vlc(struct private_wmadec_data *pwd, int sidx, int didx)
 158 {
 159         const struct coef_vlc_table *src = coef_vlcs + sidx;
 160         struct vlc *dst = pwd->coef_vlc + didx;
 161         int i, l, j, k, level, n = src->n;
 162
 163         init_vlc(dst, VLCBITS, n, src->huffbits, src->huffcodes, 4);
 164         pwd->run_table[didx] = para_malloc(n * sizeof(uint16_t));
 165         pwd->level_table[didx] = para_malloc(n * sizeof(uint16_t));
 166         i = 2;
 167         level = 1;
 168         k = 0;
 169         while (i < n) {
 170                 l = src->levels[k++];
 171                 for (j = 0; j < l; j++) {
 172                         pwd->run_table[didx][i] = j;
 173                         pwd->level_table[didx][i] = level;
 174                         i++;
 175                 }
 176                 level++;
 177         }
 178 }
 179
 180 /* compute the scale factor band sizes for each MDCT block size */
 181 static void compute_scale_factor_band_sizes(struct private_wmadec_data *pwd,
 182         float high_freq)
 183 {
 184         struct asf_header_info *ahi = &pwd->ahi;
 185         int a, b, pos, lpos, k, block_len, i, j, n;
 186         const uint8_t *table;
 187
 188         for (k = 0; k < pwd->nb_block_sizes; k++) {
 189                 int exponent_size;
 190
 191                 block_len = pwd->frame_len >> k;
 192                 table = NULL;
 193                 a = pwd->frame_len_bits - BLOCK_MIN_BITS - k;
 194                 if (a < 3) {
 195                         if (ahi->sample_rate >= 44100)
 196                                 table = exponent_band_44100[a];
 197                         else if (ahi->sample_rate >= 32000)
 198                                 table = exponent_band_32000[a];
 199                         else if (ahi->sample_rate >= 22050)
 200                                 table = exponent_band_22050[a];
 201                 }
 202                 if (table) {
 203                         n = *table++;
 204                         for (i = 0; i < n; i++)
 205                                 pwd->exponent_bands[k][i] = table[i];
 206                         exponent_size = n;
 207                 } else {
 208                         j = 0;
 209                         lpos = 0;
 210                         for (i = 0; i < 25; i++) {
 211                                 a = wma_critical_freqs[i];
 212                                 b = ahi->sample_rate;
 213                                 pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
 214                                 pos <<= 2;
 215                                 if (pos > block_len)
 216                                         pos = block_len;
 217                                 if (pos > lpos)
 218                                         pwd->exponent_bands[k][j++] = pos - lpos;
 219                                 if (pos >= block_len)
 220                                         break;
 221                                 lpos = pos;
 222                         }
 223                         exponent_size = j;
 224                 }
 225
 226                 /* max number of coefs */
 227                 pwd->coefs_end[k] = (pwd->frame_len - ((pwd->frame_len * 9) / 100)) >> k;
 228                 /* high freq computation */
 229                 pwd->high_band_start[k] = (int) ((block_len * 2 * high_freq)
 230                         / ahi->sample_rate + 0.5);
 231                 n = exponent_size;
 232                 j = 0;
 233                 pos = 0;
 234                 for (i = 0; i < n; i++) {
 235                         int start, end;
 236                         start = pos;
 237                         pos += pwd->exponent_bands[k][i];
 238                         end = pos;
 239                         if (start < pwd->high_band_start[k])
 240                                 start = pwd->high_band_start[k];
 241                         if (end > pwd->coefs_end[k])
 242                                 end = pwd->coefs_end[k];
 243                         if (end > start)
 244                                 pwd->exponent_high_bands[k][j++] = end - start;
 245                 }
 246                 pwd->exponent_high_sizes[k] = j;
 247         }
 248 }
 249
 250 static int wma_init(struct private_wmadec_data *pwd)
 251 {
 252         int i;
 253         float bps1, high_freq;
 254         volatile float bps;
 255         int sample_rate1;
 256         int coef_vlc_table;
 257         struct asf_header_info *ahi = &pwd->ahi;
 258         int flags2 = ahi->flags2;
 259
 260         if (ahi->sample_rate <= 0 || ahi->sample_rate > 50000
 261                 || ahi->channels <= 0 || ahi->channels > 8
 262                 || ahi->bit_rate <= 0)
 263                 return -E_WMA_BAD_PARAMS;
 264
 265         /* compute MDCT block size */
 266         if (ahi->sample_rate <= 16000)
 267                 pwd->frame_len_bits = 9;
 268         else if (ahi->sample_rate <= 22050)
 269                 pwd->frame_len_bits = 10;
 270         else
 271                 pwd->frame_len_bits = 11;
 272         pwd->frame_len = 1 << pwd->frame_len_bits;
 273         if (pwd->ahi.use_variable_block_len) {
 274                 int nb_max, nb;
 275                 nb = ((flags2 >> 3) & 3) + 1;
 276                 if ((ahi->bit_rate / ahi->channels) >= 32000)
 277                         nb += 2;
 278                 nb_max = pwd->frame_len_bits - BLOCK_MIN_BITS;
 279                 if (nb > nb_max)
 280                         nb = nb_max;
 281                 pwd->nb_block_sizes = nb + 1;
 282         } else
 283                 pwd->nb_block_sizes = 1;
 284
 285         /* init rate dependent parameters */
 286         pwd->use_noise_coding = 1;
 287         high_freq = ahi->sample_rate * 0.5;
 288
 289         /* wma2 rates are normalized */
 290         sample_rate1 = ahi->sample_rate;
 291         if (sample_rate1 >= 44100)
 292                 sample_rate1 = 44100;
 293         else if (sample_rate1 >= 22050)
 294                 sample_rate1 = 22050;
 295         else if (sample_rate1 >= 16000)
 296                 sample_rate1 = 16000;
 297         else if (sample_rate1 >= 11025)
 298                 sample_rate1 = 11025;
 299         else if (sample_rate1 >= 8000)
 300                 sample_rate1 = 8000;
 301
 302         bps = (float) ahi->bit_rate / (float) (ahi->channels * ahi->sample_rate);
 303         pwd->byte_offset_bits = wma_log2((int) (bps * pwd->frame_len / 8.0 + 0.5)) + 2;
 304         /*
 305          * Compute high frequency value and choose if noise coding should be
 306          * activated.
 307          */
 308         bps1 = bps;
 309         if (ahi->channels == 2)
 310                 bps1 = bps * 1.6;
 311         if (sample_rate1 == 44100) {
 312                 if (bps1 >= 0.61)
 313                         pwd->use_noise_coding = 0;
 314                 else
 315                         high_freq = high_freq * 0.4;
 316         } else if (sample_rate1 == 22050) {
 317                 if (bps1 >= 1.16)
 318                         pwd->use_noise_coding = 0;
 319                 else if (bps1 >= 0.72)
 320                         high_freq = high_freq * 0.7;
 321                 else
 322                         high_freq = high_freq * 0.6;
 323         } else if (sample_rate1 == 16000) {
 324                 if (bps > 0.5)
 325                         high_freq = high_freq * 0.5;
 326                 else
 327                         high_freq = high_freq * 0.3;
 328         } else if (sample_rate1 == 11025)
 329                 high_freq = high_freq * 0.7;
 330         else if (sample_rate1 == 8000) {
 331                 if (bps <= 0.625)
 332                         high_freq = high_freq * 0.5;
 333                 else if (bps > 0.75)
 334                         pwd->use_noise_coding = 0;
 335                 else
 336                         high_freq = high_freq * 0.65;
 337         } else {
 338                 if (bps >= 0.8)
 339                         high_freq = high_freq * 0.75;
 340                 else if (bps >= 0.6)
 341                         high_freq = high_freq * 0.6;
 342                 else
 343                         high_freq = high_freq * 0.5;
 344         }
 345         PARA_INFO_LOG("channels=%u sample_rate=%u "
 346                 "bitrate=%u block_align=%d\n",
 347                 ahi->channels, ahi->sample_rate,
 348                 ahi->bit_rate, ahi->block_align);
 349         PARA_INFO_LOG("frame_len=%d, bps=%f bps1=%f "
 350                 "high_freq=%f bitoffset=%d\n",
 351                 pwd->frame_len, bps, bps1,
 352                 high_freq, pwd->byte_offset_bits);
 353         PARA_INFO_LOG("use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
 354                 pwd->use_noise_coding, pwd->ahi.use_exp_vlc, pwd->nb_block_sizes);
 355
 356         compute_scale_factor_band_sizes(pwd, high_freq);
 357         /* init MDCT windows : simple sinus window */
 358         for (i = 0; i < pwd->nb_block_sizes; i++) {
 359                 int n;
 360                 n = 1 << (pwd->frame_len_bits - i);
 361                 sine_window_init(sine_windows[pwd->frame_len_bits - i - 7], n);
 362                 pwd->windows[i] = sine_windows[pwd->frame_len_bits - i - 7];
 363         }
 364
 365         pwd->reset_block_lengths = true;
 366
 367         if (pwd->use_noise_coding) {
 368                 /* init the noise generator */
 369                 if (pwd->ahi.use_exp_vlc)
 370                         pwd->noise_mult = 0.02;
 371                 else
 372                         pwd->noise_mult = 0.04;
 373
 374                 {
 375                         unsigned int seed;
 376                         float norm;
 377                         seed = 1;
 378                         norm = (1.0 / (float) (1LL << 31)) * sqrt(3) * pwd->noise_mult;
 379                         for (i = 0; i < NOISE_TAB_SIZE; i++) {
 380                                 seed = seed * 314159 + 1;
 381                                 pwd->noise_table[i] = (float) ((int) seed) * norm;
 382                         }
 383                 }
 384         }
 385
 386         /* choose the VLC tables for the coefficients */
 387         coef_vlc_table = 4;
 388         if (ahi->sample_rate >= 32000) {
 389                 if (bps1 < 0.72)
 390                         coef_vlc_table = 0;
 391                 else if (bps1 < 1.16)
 392                         coef_vlc_table = 2;
 393         }
 394         init_coef_vlc(pwd, coef_vlc_table, 0);
 395         init_coef_vlc(pwd, coef_vlc_table + 1, 1);
 396         return 0;
 397 }
 398
 399 static void wma_lsp_to_curve_init(struct private_wmadec_data *pwd)
 400 {
 401         float wdel, a, b;
 402         int i, e, m;
 403
 404         wdel = M_PI / pwd->frame_len;
 405         for (i = 0; i < pwd->frame_len; i++)
 406                 pwd->lsp_cos_table[i] = 2.0f * cos(wdel * i);
 407
 408         /* tables for x^-0.25 computation */
 409         for (i = 0; i < 256; i++) {
 410                 e = i - 126;
 411                 pwd->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
 412         }
 413
 414         /* These two tables are needed to avoid two operations in pow_m1_4. */
 415         b = 1.0;
 416         for (i = (1 << LSP_POW_BITS) - 1; i >= 0; i--) {
 417                 m = (1 << LSP_POW_BITS) + i;
 418                 a = (float) m *(0.5 / (1 << LSP_POW_BITS));
 419                 a = pow(a, -0.25);
 420                 pwd->lsp_pow_m_table1[i] = 2 * a - b;
 421                 pwd->lsp_pow_m_table2[i] = b - a;
 422                 b = a;
 423         }
 424 }
 425
 426 static int wma_decode_init(char *initial_buf, int len, struct private_wmadec_data **result)
 427 {
 428         struct private_wmadec_data *pwd;
 429         int ret, i;
 430
 431         PARA_NOTICE_LOG("initial buf: %d bytes\n", len);
 432         pwd = para_calloc(sizeof(*pwd));
 433         ret = read_asf_header(initial_buf, len, &pwd->ahi);
 434         if (ret <= 0) {
 435                 free(pwd);
 436                 return ret;
 437         }
 438
 439         ret = wma_init(pwd);
 440         if (ret < 0)
 441                 return ret;
 442         /* init MDCT */
 443         for (i = 0; i < pwd->nb_block_sizes; i++) {
 444                 ret = imdct_init(pwd->frame_len_bits - i + 1, &pwd->mdct_ctx[i]);
 445                 if (ret < 0)
 446                         return ret;
 447         }
 448         if (pwd->use_noise_coding) {
 449                 PARA_INFO_LOG("using noise coding\n");
 450                 init_vlc(&pwd->hgain_vlc, HGAINVLCBITS,
 451                         sizeof(wma_hgain_huffbits), wma_hgain_huffbits,
 452                         wma_hgain_huffcodes, 2);
 453         }
 454
 455         if (pwd->ahi.use_exp_vlc) {
 456                 PARA_INFO_LOG("using exp_vlc\n");
 457                 init_vlc(&pwd->exp_vlc, EXPVLCBITS, sizeof(wma_scale_huffbits),
 458                         wma_scale_huffbits, wma_scale_huffcodes, 4);
 459         } else {
 460                 PARA_INFO_LOG("using curve\n");
 461                 wma_lsp_to_curve_init(pwd);
 462         }
 463         *result = pwd;
 464         return pwd->ahi.header_len;
 465 }
 466
 467 /**
 468  * compute x^-0.25 with an exponent and mantissa table. We use linear
 469  * interpolation to reduce the mantissa table size at a small speed
 470  * expense (linear interpolation approximately doubles the number of
 471  * bits of precision).
 472  */
 473 static inline float pow_m1_4(struct private_wmadec_data *pwd, float x)
 474 {
 475         union {
 476                 float f;
 477                 unsigned int v;
 478         } u, t;
 479         unsigned int e, m;
 480         float a, b;
 481
 482         u.f = x;
 483         e = u.v >> 23;
 484         m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
 485         /* build interpolation scale: 1 <= t < 2. */
 486         t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
 487         a = pwd->lsp_pow_m_table1[m];
 488         b = pwd->lsp_pow_m_table2[m];
 489         return pwd->lsp_pow_e_table[e] * (a + b * t.f);
 490 }
 491
 492 static void wma_lsp_to_curve(struct private_wmadec_data *pwd,
 493                 float *out, float *val_max_ptr, int n, float *lsp)
 494 {
 495         int i, j;
 496         float p, q, w, v, val_max;
 497
 498         val_max = 0;
 499         for (i = 0; i < n; i++) {
 500                 p = 0.5f;
 501                 q = 0.5f;
 502                 w = pwd->lsp_cos_table[i];
 503                 for (j = 1; j < NB_LSP_COEFS; j += 2) {
 504                         q *= w - lsp[j - 1];
 505                         p *= w - lsp[j];
 506                 }
 507                 p *= p * (2.0f - w);
 508                 q *= q * (2.0f + w);
 509                 v = p + q;
 510                 v = pow_m1_4(pwd, v);
 511                 if (v > val_max)
 512                         val_max = v;
 513                 out[i] = v;
 514         }
 515         *val_max_ptr = val_max;
 516 }
 517
 518 /* Decode exponents coded with LSP coefficients (same idea as Vorbis). */
 519 static void decode_exp_lsp(struct private_wmadec_data *pwd, int ch)
 520 {
 521         float lsp_coefs[NB_LSP_COEFS];
 522         int val, i;
 523
 524         for (i = 0; i < NB_LSP_COEFS; i++) {
 525                 if (i == 0 || i >= 8)
 526                         val = get_bits(&pwd->gb, 3);
 527                 else
 528                         val = get_bits(&pwd->gb, 4);
 529                 lsp_coefs[i] = wma_lsp_codebook[i][val];
 530         }
 531
 532         wma_lsp_to_curve(pwd, pwd->exponents[ch], &pwd->max_exponent[ch],
 533                 pwd->block_len, lsp_coefs);
 534 }
 535
 536 /* Decode exponents coded with VLC codes. */
 537 static int decode_exp_vlc(struct private_wmadec_data *pwd, int ch)
 538 {
 539         int last_exp, n, code;
 540         const uint16_t *ptr, *band_ptr;
 541         float v, *q, max_scale, *q_end;
 542
 543         band_ptr = pwd->exponent_bands[pwd->frame_len_bits - pwd->block_len_bits];
 544         ptr = band_ptr;
 545         q = pwd->exponents[ch];
 546         q_end = q + pwd->block_len;
 547         max_scale = 0;
 548         last_exp = 36;
 549
 550         while (q < q_end) {
 551                 code = get_vlc(&pwd->gb, &pwd->exp_vlc);
 552                 if (code < 0)
 553                         return code;
 554                 /* NOTE: this offset is the same as MPEG4 AAC ! */
 555                 last_exp += code - 60;
 556                 /* XXX: use a table */
 557                 v = pow(10, last_exp * (1.0 / 16.0));
 558                 if (v > max_scale)
 559                         max_scale = v;
 560                 n = *ptr++;
 561                 do {
 562                         *q++ = v;
 563                 } while (--n);
 564         }
 565         pwd->max_exponent[ch] = max_scale;
 566         return 0;
 567 }
 568
 569 /* compute src0 * src1 + src2 */
 570 static inline void vector_mult_add(float *dst, const float *src0, const float *src1,
 571                 const float *src2, int len)
 572 {
 573         int i;
 574
 575         for (i = 0; i < len; i++)
 576                 dst[i] = src0[i] * src1[i] + src2[i];
 577 }
 578
 579 static inline void vector_mult_reverse(float *dst, const float *src0,
 580                 const float *src1, int len)
 581 {
 582         int i;
 583
 584         src1 += len - 1;
 585         for (i = 0; i < len; i++)
 586                 dst[i] = src0[i] * src1[-i];
 587 }
 588
 589 /**
 590  * Apply MDCT window and add into output.
 591  *
 592  * We ensure that when the windows overlap their squared sum
 593  * is always 1 (MDCT reconstruction rule).
 594  */
 595 static void wma_window(struct private_wmadec_data *pwd, float *out)
 596 {
 597         float *in = pwd->output;
 598         int block_len, bsize, n;
 599
 600         /* left part */
 601         if (pwd->block_len_bits <= pwd->prev_block_len_bits) {
 602                 block_len = pwd->block_len;
 603                 bsize = pwd->frame_len_bits - pwd->block_len_bits;
 604                 vector_mult_add(out, in, pwd->windows[bsize], out, block_len);
 605         } else {
 606                 block_len = 1 << pwd->prev_block_len_bits;
 607                 n = (pwd->block_len - block_len) / 2;
 608                 bsize = pwd->frame_len_bits - pwd->prev_block_len_bits;
 609                 vector_mult_add(out + n, in + n, pwd->windows[bsize], out + n,
 610                         block_len);
 611                 memcpy(out + n + block_len, in + n + block_len,
 612                         n * sizeof(float));
 613         }
 614         out += pwd->block_len;
 615         in += pwd->block_len;
 616         /* right part */
 617         if (pwd->block_len_bits <= pwd->next_block_len_bits) {
 618                 block_len = pwd->block_len;
 619                 bsize = pwd->frame_len_bits - pwd->block_len_bits;
 620                 vector_mult_reverse(out, in, pwd->windows[bsize], block_len);
 621         } else {
 622                 block_len = 1 << pwd->next_block_len_bits;
 623                 n = (pwd->block_len - block_len) / 2;
 624                 bsize = pwd->frame_len_bits - pwd->next_block_len_bits;
 625                 memcpy(out, in, n * sizeof(float));
 626                 vector_mult_reverse(out + n, in + n, pwd->windows[bsize],
 627                         block_len);
 628                 memset(out + n + block_len, 0, n * sizeof(float));
 629         }
 630 }
 631
 632 static int wma_total_gain_to_bits(int total_gain)
 633 {
 634         if (total_gain < 15)
 635                 return 13;
 636         else if (total_gain < 32)
 637                 return 12;
 638         else if (total_gain < 40)
 639                 return 11;
 640         else if (total_gain < 45)
 641                 return 10;
 642         else
 643                 return 9;
 644 }
 645
 646 static int compute_high_band_values(struct private_wmadec_data *pwd,
 647                 int bsize, int nb_coefs[MAX_CHANNELS])
 648 {
 649         int ch;
 650
 651         if (!pwd->use_noise_coding)
 652                 return 0;
 653         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 654                 int i, m, a;
 655                 if (!pwd->channel_coded[ch])
 656                         continue;
 657                 m = pwd->exponent_high_sizes[bsize];
 658                 for (i = 0; i < m; i++) {
 659                         a = get_bit(&pwd->gb);
 660                         pwd->high_band_coded[ch][i] = a;
 661                         if (!a)
 662                                 continue;
 663                         nb_coefs[ch] -= pwd->exponent_high_bands[bsize][i];
 664                 }
 665         }
 666         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 667                 int i, n, val;
 668                 if (!pwd->channel_coded[ch])
 669                         continue;
 670                 n = pwd->exponent_high_sizes[bsize];
 671                 val = (int)0x80000000;
 672                 for (i = 0; i < n; i++) {
 673                         if (!pwd->high_band_coded[ch][i])
 674                                 continue;
 675                         if (val == (int)0x80000000)
 676                                 val = get_bits(&pwd->gb, 7) - 19;
 677                         else {
 678                                 int code = get_vlc(&pwd->gb, &pwd->hgain_vlc);
 679                                 if (code < 0)
 680                                         return code;
 681                                 val += code - 18;
 682                         }
 683                         pwd->high_band_values[ch][i] = val;
 684                 }
 685         }
 686         return 1;
 687 }
 688
 689 static void compute_mdct_coefficients(struct private_wmadec_data *pwd,
 690                 int bsize, int total_gain, int nb_coefs[MAX_CHANNELS])
 691 {
 692         int ch;
 693         float mdct_norm = 1.0 / (pwd->block_len / 2);
 694
 695         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 696                 int16_t *coefs1;
 697                 float *coefs, *exponents, mult, mult1, noise;
 698                 int i, j, n, n1, last_high_band, esize;
 699                 float exp_power[HIGH_BAND_MAX_SIZE];
 700
 701                 if (!pwd->channel_coded[ch])
 702                         continue;
 703                 coefs1 = pwd->coefs1[ch];
 704                 exponents = pwd->exponents[ch];
 705                 esize = pwd->exponents_bsize[ch];
 706                 mult = pow(10, total_gain * 0.05) / pwd->max_exponent[ch];
 707                 mult *= mdct_norm;
 708                 coefs = pwd->coefs[ch];
 709                 if (!pwd->use_noise_coding) {
 710                         /* XXX: optimize more */
 711                         n = nb_coefs[ch];
 712                         for (i = 0; i < n; i++)
 713                                 *coefs++ = coefs1[i] *
 714                                         exponents[i << bsize >> esize] * mult;
 715                         n = pwd->block_len - pwd->coefs_end[bsize];
 716                         for (i = 0; i < n; i++)
 717                                 *coefs++ = 0.0;
 718                         continue;
 719                 }
 720                 n1 = pwd->exponent_high_sizes[bsize];
 721                 /* compute power of high bands */
 722                 exponents = pwd->exponents[ch] +
 723                         (pwd->high_band_start[bsize] << bsize);
 724                 last_high_band = 0; /* avoid warning */
 725                 for (j = 0; j < n1; j++) {
 726                         n = pwd->exponent_high_bands[
 727                                 pwd->frame_len_bits - pwd->block_len_bits][j];
 728                         if (pwd->high_band_coded[ch][j]) {
 729                                 float e2, val;
 730                                 e2 = 0;
 731                                 for (i = 0; i < n; i++) {
 732                                         val = exponents[i << bsize >> esize];
 733                                         e2 += val * val;
 734                                 }
 735                                 exp_power[j] = e2 / n;
 736                                 last_high_band = j;
 737                         }
 738                         exponents += n << bsize;
 739                 }
 740                 /* main freqs and high freqs */
 741                 exponents = pwd->exponents[ch];
 742                 for (j = -1; j < n1; j++) {
 743                         if (j < 0)
 744                                 n = pwd->high_band_start[bsize];
 745                         else
 746                                 n = pwd->exponent_high_bands[pwd->frame_len_bits
 747                                         - pwd->block_len_bits][j];
 748                         if (j >= 0 && pwd->high_band_coded[ch][j]) {
 749                                 /* use noise with specified power */
 750                                 mult1 = sqrt(exp_power[j]
 751                                         / exp_power[last_high_band]);
 752                                 /* XXX: use a table */
 753                                 mult1 *= pow(10, pwd->high_band_values[ch][j] * 0.05);
 754                                 mult1 /= (pwd->max_exponent[ch] * pwd->noise_mult);
 755                                 mult1 *= mdct_norm;
 756                                 for (i = 0; i < n; i++) {
 757                                         noise = pwd->noise_table[pwd->noise_index];
 758                                         pwd->noise_index = (pwd->noise_index + 1)
 759                                                 & (NOISE_TAB_SIZE - 1);
 760                                         *coefs++ = noise * exponents[
 761                                                 i << bsize >> esize] * mult1;
 762                                 }
 763                                 exponents += n << bsize;
 764                         } else {
 765                                 /* coded values + small noise */
 766                                 for (i = 0; i < n; i++) {
 767                                         noise = pwd->noise_table[pwd->noise_index];
 768                                         pwd->noise_index = (pwd->noise_index + 1)
 769                                                 & (NOISE_TAB_SIZE - 1);
 770                                         *coefs++ = ((*coefs1++) + noise) *
 771                                                 exponents[i << bsize >> esize]
 772                                                 * mult;
 773                                 }
 774                                 exponents += n << bsize;
 775                         }
 776                 }
 777                 /* very high freqs: noise */
 778                 n = pwd->block_len - pwd->coefs_end[bsize];
 779                 mult1 = mult * exponents[(-(1 << bsize)) >> esize];
 780                 for (i = 0; i < n; i++) {
 781                         *coefs++ = pwd->noise_table[pwd->noise_index] * mult1;
 782                         pwd->noise_index = (pwd->noise_index + 1)
 783                                 & (NOISE_TAB_SIZE - 1);
 784                 }
 785         }
 786 }
 787
 788 /**
 789  * Returns 0 if OK, 1 if last block of frame, negative on uncorrectable
 790  * errors.
 791  */
 792 static int wma_decode_block(struct private_wmadec_data *pwd)
 793 {
 794         int ret, n, v, ch, code, bsize;
 795         int coef_nb_bits, total_gain;
 796         int nb_coefs[MAX_CHANNELS];
 797         bool ms_stereo = false; /* mid/side stereo mode */
 798
 799         /* compute current block length */
 800         if (pwd->ahi.use_variable_block_len) {
 801                 n = wma_log2(pwd->nb_block_sizes - 1) + 1;
 802
 803                 if (pwd->reset_block_lengths) {
 804                         pwd->reset_block_lengths = false;
 805                         v = get_bits(&pwd->gb, n);
 806                         if (v >= pwd->nb_block_sizes)
 807                                 return -E_WMA_BLOCK_SIZE;
 808                         pwd->prev_block_len_bits = pwd->frame_len_bits - v;
 809                         v = get_bits(&pwd->gb, n);
 810                         if (v >= pwd->nb_block_sizes)
 811                                 return -E_WMA_BLOCK_SIZE;
 812                         pwd->block_len_bits = pwd->frame_len_bits - v;
 813                 } else {
 814                         /* update block lengths */
 815                         pwd->prev_block_len_bits = pwd->block_len_bits;
 816                         pwd->block_len_bits = pwd->next_block_len_bits;
 817                 }
 818                 v = get_bits(&pwd->gb, n);
 819                 if (v >= pwd->nb_block_sizes)
 820                         return -E_WMA_BLOCK_SIZE;
 821                 pwd->next_block_len_bits = pwd->frame_len_bits - v;
 822         } else {
 823                 /* fixed block len */
 824                 pwd->next_block_len_bits = pwd->frame_len_bits;
 825                 pwd->prev_block_len_bits = pwd->frame_len_bits;
 826                 pwd->block_len_bits = pwd->frame_len_bits;
 827         }
 828
 829         /* now check if the block length is coherent with the frame length */
 830         pwd->block_len = 1 << pwd->block_len_bits;
 831         if ((pwd->block_pos + pwd->block_len) > pwd->frame_len)
 832                 return -E_INCOHERENT_BLOCK_LEN;
 833
 834         if (pwd->ahi.channels == 2)
 835                 ms_stereo = get_bit(&pwd->gb);
 836         v = 0;
 837         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 838                 int a = get_bit(&pwd->gb);
 839                 pwd->channel_coded[ch] = a;
 840                 v |= a;
 841         }
 842
 843         bsize = pwd->frame_len_bits - pwd->block_len_bits;
 844
 845         /* if no channel coded, no need to go further */
 846         /* XXX: fix potential framing problems */
 847         if (!v)
 848                 goto next;
 849
 850         /*
 851          * Read total gain and extract corresponding number of bits for coef
 852          * escape coding.
 853          */
 854         total_gain = 1;
 855         for (;;) {
 856                 int a = get_bits(&pwd->gb, 7);
 857                 total_gain += a;
 858                 if (a != 127)
 859                         break;
 860         }
 861
 862         coef_nb_bits = wma_total_gain_to_bits(total_gain);
 863
 864         /* compute number of coefficients */
 865         n = pwd->coefs_end[bsize];
 866         for (ch = 0; ch < pwd->ahi.channels; ch++)
 867                 nb_coefs[ch] = n;
 868
 869         ret = compute_high_band_values(pwd, bsize, nb_coefs);
 870         if (ret < 0)
 871                 return ret;
 872
 873         /* exponents can be reused in short blocks. */
 874         if ((pwd->block_len_bits == pwd->frame_len_bits) || get_bit(&pwd->gb)) {
 875                 for (ch = 0; ch < pwd->ahi.channels; ch++) {
 876                         if (pwd->channel_coded[ch]) {
 877                                 if (pwd->ahi.use_exp_vlc) {
 878                                         ret = decode_exp_vlc(pwd, ch);
 879                                         if (ret < 0)
 880                                                 return ret;
 881                                 } else
 882                                         decode_exp_lsp(pwd, ch);
 883                                 pwd->exponents_bsize[ch] = bsize;
 884                         }
 885                 }
 886         }
 887
 888         /* parse spectral coefficients : just RLE encoding */
 889         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 890                 struct vlc *coef_vlc;
 891                 int level, run, tindex;
 892                 int16_t *ptr, *eptr;
 893                 const uint16_t *level_table, *run_table;
 894
 895                 if (!pwd->channel_coded[ch])
 896                         continue;
 897                 /*
 898                  * special VLC tables are used for ms stereo because there is
 899                  * potentially less energy there
 900                  */
 901                 tindex = ch == 1 && ms_stereo;
 902                 coef_vlc = &pwd->coef_vlc[tindex];
 903                 run_table = pwd->run_table[tindex];
 904                 level_table = pwd->level_table[tindex];
 905                 /* XXX: optimize */
 906                 ptr = &pwd->coefs1[ch][0];
 907                 eptr = ptr + nb_coefs[ch];
 908                 memset(ptr, 0, pwd->block_len * sizeof(int16_t));
 909                 for (;;) {
 910                         code = get_vlc(&pwd->gb, coef_vlc);
 911                         if (code < 0)
 912                                 return code;
 913                         if (code == 1) /* EOB */
 914                                 break;
 915                         if (code == 0) { /* escape */
 916                                 level = get_bits(&pwd->gb, coef_nb_bits);
 917                                 /* reading block_len_bits would be better */
 918                                 run = get_bits(&pwd->gb, pwd->frame_len_bits);
 919                         } else { /* normal code */
 920                                 run = run_table[code];
 921                                 level = level_table[code];
 922                         }
 923                         if (!get_bit(&pwd->gb))
 924                                 level = -level;
 925                         ptr += run;
 926                         if (ptr >= eptr) {
 927                                 PARA_ERROR_LOG("overflow in spectral RLE, ignoring\n");
 928                                 break;
 929                         }
 930                         *ptr++ = level;
 931                         if (ptr >= eptr) /* EOB can be omitted */
 932                                 break;
 933                 }
 934         }
 935         compute_mdct_coefficients(pwd, bsize, total_gain, nb_coefs);
 936         if (ms_stereo && pwd->channel_coded[1]) {
 937                 float a, b;
 938                 int i;
 939                 /*
 940                  * Nominal case for ms stereo: we do it before mdct.
 941                  *
 942                  * No need to optimize this case because it should almost never
 943                  * happen.
 944                  */
 945                 if (!pwd->channel_coded[0]) {
 946                         PARA_NOTICE_LOG("rare ms-stereo\n");
 947                         memset(pwd->coefs[0], 0, sizeof(float) * pwd->block_len);
 948                         pwd->channel_coded[0] = 1;
 949                 }
 950                 for (i = 0; i < pwd->block_len; i++) {
 951                         a = pwd->coefs[0][i];
 952                         b = pwd->coefs[1][i];
 953                         pwd->coefs[0][i] = a + b;
 954                         pwd->coefs[1][i] = a - b;
 955                 }
 956         }
 957 next:
 958         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 959                 int n4, idx;
 960
 961                 n4 = pwd->block_len / 2;
 962                 if (pwd->channel_coded[ch])
 963                         imdct(pwd->mdct_ctx[bsize], pwd->output, pwd->coefs[ch]);
 964                 else if (!(ms_stereo && ch == 1))
 965                         memset(pwd->output, 0, sizeof(pwd->output));
 966
 967                 /* multiply by the window and add in the frame */
 968                 idx = (pwd->frame_len / 2) + pwd->block_pos - n4;
 969                 wma_window(pwd, &pwd->frame_out[ch][idx]);
 970         }
 971
 972         /* update block number */
 973         pwd->block_pos += pwd->block_len;
 974         if (pwd->block_pos >= pwd->frame_len)
 975                 return 1;
 976         else
 977                 return 0;
 978 }
 979
 980 /*
 981  * Clip a signed integer value into the -32768,32767 range.
 982  *
 983  * \param a The value to clip.
 984  *
 985  * \return The clipped value.
 986  */
 987 static inline int16_t av_clip_int16(int a)
 988 {
 989         if ((a + 32768) & ~65535)
 990                 return (a >> 31) ^ 32767;
 991         else
 992                 return a;
 993 }
 994
 995 /* Decode a frame of frame_len samples. */
 996 static int wma_decode_frame(struct private_wmadec_data *pwd, int16_t *samples)
 997 {
 998         int ret, i, ch;
 999         int16_t *ptr;
1000         float *iptr;
1001
1002         /* read each block */
1003         pwd->block_pos = 0;
1004         for (;;) {
1005                 ret = wma_decode_block(pwd);
1006                 if (ret < 0)
1007                         return ret;
1008                 if (ret)
1009                         break;
1010         }
1011
1012         /* convert frame to integer */
1013         for (ch = 0; ch < pwd->ahi.channels; ch++) {
1014                 ptr = samples + ch;
1015                 iptr = pwd->frame_out[ch];
1016
1017                 for (i = 0; i < pwd->frame_len; i++) {
1018                         *ptr = av_clip_int16(lrintf(*iptr++));
1019                         ptr += pwd->ahi.channels;
1020                 }
1021                 /* prepare for next block */
1022                 memmove(&pwd->frame_out[ch][0], &pwd->frame_out[ch][pwd->frame_len],
1023                         pwd->frame_len * sizeof(float));
1024         }
1025         return 0;
1026 }
1027
1028 static int wma_decode_superframe(struct private_wmadec_data *pwd, void *out,
1029                 int *out_size, const uint8_t *in)
1030 {
1031         int ret, in_size = pwd->ahi.packet_size - WMA_FRAME_SKIP;
1032         int16_t *samples = out;
1033
1034         init_get_bits(&pwd->gb, in, in_size);
1035         if (pwd->ahi.use_bit_reservoir) {
1036                 int i, nb_frames, bit_offset, pos, len;
1037                 uint8_t *q;
1038
1039                 /* read super frame header */
1040                 skip_bits(&pwd->gb, 4); /* super frame index */
1041                 nb_frames = get_bits(&pwd->gb, 4) - 1;
1042                 // PARA_DEBUG_LOG("have %d frames\n", nb_frames);
1043                 ret = -E_WMA_OUTPUT_SPACE;
1044                 if ((nb_frames + 1) * pwd->ahi.channels * pwd->frame_len
1045                                 * sizeof(int16_t) > *out_size)
1046                         goto fail;
1047
1048                 bit_offset = get_bits(&pwd->gb, pwd->byte_offset_bits + 3);
1049
1050                 if (pwd->last_superframe_len > 0) {
1051                         /* add bit_offset bits to last frame */
1052                         ret = -E_WMA_BAD_SUPERFRAME;
1053                         if ((pwd->last_superframe_len + ((bit_offset + 7) >> 3)) >
1054                                         MAX_CODED_SUPERFRAME_SIZE)
1055                                 goto fail;
1056                         q = pwd->last_superframe + pwd->last_superframe_len;
1057                         len = bit_offset;
1058                         while (len > 7) {
1059                                 *q++ = get_bits(&pwd->gb, 8);
1060                                 len -= 8;
1061                         }
1062                         if (len > 0)
1063                                 *q++ = get_bits(&pwd->gb, len) << (8 - len);
1064
1065                         /* XXX: bit_offset bits into last frame */
1066                         init_get_bits(&pwd->gb, pwd->last_superframe,
1067                                 MAX_CODED_SUPERFRAME_SIZE);
1068                         /* skip unused bits */
1069                         if (pwd->last_bitoffset > 0)
1070                                 skip_bits(&pwd->gb, pwd->last_bitoffset);
1071                         /*
1072                          * This frame is stored in the last superframe and in
1073                          * the current one.
1074                          */
1075                         ret = wma_decode_frame(pwd, samples);
1076                         if (ret < 0)
1077                                 goto fail;
1078                         samples += pwd->ahi.channels * pwd->frame_len;
1079                 }
1080
1081                 /* read each frame starting from bit_offset */
1082                 pos = bit_offset + 4 + 4 + pwd->byte_offset_bits + 3;
1083                 init_get_bits(&pwd->gb, in + (pos >> 3),
1084                         (MAX_CODED_SUPERFRAME_SIZE - (pos >> 3)));
1085                 len = pos & 7;
1086                 if (len > 0)
1087                         skip_bits(&pwd->gb, len);
1088
1089                 pwd->reset_block_lengths = true;
1090                 for (i = 0; i < nb_frames; i++) {
1091                         ret = wma_decode_frame(pwd, samples);
1092                         if (ret < 0)
1093                                 goto fail;
1094                         samples += pwd->ahi.channels * pwd->frame_len;
1095                 }
1096
1097                 /* we copy the end of the frame in the last frame buffer */
1098                 pos = get_bits_count(&pwd->gb) +
1099                         ((bit_offset + 4 + 4 + pwd->byte_offset_bits + 3) & ~7);
1100                 pwd->last_bitoffset = pos & 7;
1101                 pos >>= 3;
1102                 len = in_size - pos;
1103                 ret = -E_WMA_BAD_SUPERFRAME;
1104                 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0)
1105                         goto fail;
1106                 pwd->last_superframe_len = len;
1107                 memcpy(pwd->last_superframe, in + pos, len);
1108         } else {
1109                 PARA_DEBUG_LOG("not using bit reservoir\n");
1110                 ret = -E_WMA_OUTPUT_SPACE;
1111                 if (pwd->ahi.channels * pwd->frame_len * sizeof(int16_t) > *out_size)
1112                         goto fail;
1113                 /* single frame decode */
1114                 ret = wma_decode_frame(pwd, samples);
1115                 if (ret < 0)
1116                         goto fail;
1117                 samples += pwd->ahi.channels * pwd->frame_len;
1118         }
1119         PARA_DEBUG_LOG("frame_len: %d, block_len: %d, outbytes: %d, eaten: %d\n",
1120                 pwd->frame_len, pwd->block_len,
1121                 (int)((int8_t *)samples - (int8_t *)out), pwd->ahi.block_align);
1122         *out_size = (int8_t *)samples - (int8_t *)out;
1123         return pwd->ahi.block_align;
1124 fail:
1125         /* reset the bit reservoir on errors */
1126         pwd->last_superframe_len = 0;
1127         return ret;
1128 }
1129
1130 static void wmadec_close(struct filter_node *fn)
1131 {
1132         struct private_wmadec_data *pwd = fn->private_data;
1133         int i;
1134
1135         if (!pwd)
1136                 return;
1137         for (i = 0; i < pwd->nb_block_sizes; i++)
1138                 imdct_end(pwd->mdct_ctx[i]);
1139         if (pwd->ahi.use_exp_vlc)
1140                 free_vlc(&pwd->exp_vlc);
1141         if (pwd->use_noise_coding)
1142                 free_vlc(&pwd->hgain_vlc);
1143         for (i = 0; i < 2; i++) {
1144                 free_vlc(&pwd->coef_vlc[i]);
1145                 free(pwd->run_table[i]);
1146                 free(pwd->level_table[i]);
1147         }
1148         free(fn->private_data);
1149         fn->private_data = NULL;
1150 }
1151
1152 static int wmadec_execute(struct btr_node *btrn, const char *cmd, char **result)
1153 {
1154         struct filter_node *fn = btr_context(btrn);
1155         struct private_wmadec_data *pwd = fn->private_data;
1156
1157         return decoder_execute(cmd, pwd->ahi.sample_rate, pwd->ahi.channels,
1158                 result);
1159 }
1160
1161 #define WMA_OUTPUT_BUFFER_SIZE (128 * 1024)
1162
1163 static int wmadec_post_select(__a_unused struct sched *s, void *context)
1164 {
1165         struct filter_node *fn = context;
1166         int ret, converted, out_size;
1167         struct private_wmadec_data *pwd = fn->private_data;
1168         struct btr_node *btrn = fn->btrn;
1169         size_t len;
1170         char *in, *out;
1171
1172 next_buffer:
1173         converted = 0;
1174         ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
1175         if (ret < 0)
1176                 goto err;
1177         if (ret == 0)
1178                 return 0;
1179         btr_merge(btrn, fn->min_iqs);
1180         len = btr_next_buffer(btrn, &in);
1181         ret = -E_WMADEC_EOF;
1182         if (len < fn->min_iqs)
1183                 goto err;
1184         if (!pwd) {
1185                 ret = wma_decode_init(in, len, &pwd);
1186                 if (ret < 0)
1187                         goto err;
1188                 if (ret == 0) {
1189                         fn->min_iqs += 4096;
1190                         goto next_buffer;
1191                 }
1192                 fn->min_iqs = 2 * pwd->ahi.packet_size;
1193                 fn->private_data = pwd;
1194                 converted = pwd->ahi.header_len;
1195                 goto success;
1196         }
1197         fn->min_iqs = pwd->ahi.packet_size;
1198         if (fn->min_iqs > len)
1199                 goto success;
1200         out_size = WMA_OUTPUT_BUFFER_SIZE;
1201         out = para_malloc(out_size);
1202         ret = wma_decode_superframe(pwd, out, &out_size,
1203                 (uint8_t *)in + WMA_FRAME_SKIP);
1204         if (ret < 0) {
1205                 free(out);
1206                 goto err;
1207         }
1208         if (out_size > 0) {
1209                 out = para_realloc(out, out_size);
1210                 btr_add_output(out, out_size, btrn);
1211         } else
1212                 free(out);
1213         converted += pwd->ahi.packet_size;
1214 success:
1215         btr_consume(btrn, converted);
1216         return 0;
1217 err:
1218         assert(ret < 0);
1219         btr_remove_node(&fn->btrn);
1220         return ret;
1221 }
1222
1223 static void wmadec_open(struct filter_node *fn)
1224 {
1225         fn->private_data = NULL;
1226         fn->min_iqs = 4096;
1227 }
1228
1229 const struct filter lsg_filter_cmd_com_wmadec_user_data = {
1230         .open = wmadec_open,
1231         .close = wmadec_close,
1232         .execute = wmadec_execute,
1233         .pre_select = generic_filter_pre_select,
1234         .post_select = wmadec_post_select,
1235 };