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