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 #define _XOPEN_SOURCE 600
  19
  20 #include <math.h>
  21 #include <regex.h>
  22 #include <sys/select.h>
  23
  24 #include "para.h"
  25 #include "error.h"
  26 #include "list.h"
  27 #include "string.h"
  28 #include "sched.h"
  29 #include "buffer_tree.h"
  30 #include "filter.h"
  31 #include "portable_io.h"
  32 #include "bitstream.h"
  33 #include "imdct.h"
  34 #include "wma.h"
  35 #include "wmadata.h"
  36
  37
  38 /* size of blocks */
  39 #define BLOCK_MIN_BITS 7
  40 #define BLOCK_MAX_BITS 11
  41 #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
  42
  43 #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
  44
  45 /* XXX: find exact max size */
  46 #define HIGH_BAND_MAX_SIZE 16
  47
  48 /* XXX: is it a suitable value ? */
  49 #define MAX_CODED_SUPERFRAME_SIZE 16384
  50
  51 #define MAX_CHANNELS 2
  52
  53 #define NOISE_TAB_SIZE 8192
  54
  55 #define LSP_POW_BITS 7
  56
  57 struct private_wmadec_data {
  58         /** Information contained in the audio file header. */
  59         struct asf_header_info ahi;
  60         struct getbit_context gb;
  61         /** Whether perceptual noise is added. */
  62         int use_noise_coding;
  63         /** Depends on number of the bits per second and the frame length. */
  64         int byte_offset_bits;
  65         /** Only used if ahi->use_exp_vlc is true. */
  66         struct vlc exp_vlc;
  67         uint16_t exponent_bands[BLOCK_NB_SIZES][25];
  68         /** The index of the first coef in high band. */
  69         int high_band_start[BLOCK_NB_SIZES];
  70         /** Maximal number of coded coefficients. */
  71         int coefs_end[BLOCK_NB_SIZES];
  72         int exponent_high_sizes[BLOCK_NB_SIZES];
  73         int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
  74         struct vlc hgain_vlc;
  75
  76         /* coded values in high bands */
  77         int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
  78         int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
  79
  80         /* there are two possible tables for spectral coefficients */
  81         struct vlc coef_vlc[2];
  82         uint16_t *run_table[2];
  83         uint16_t *level_table[2];
  84         /** Frame length in samples. */
  85         int frame_len;
  86         /** log2 of frame_len. */
  87         int frame_len_bits;
  88         /** Number of block sizes, one if !ahi->use_variable_block_len. */
  89         int nb_block_sizes;
  90         /* Whether to update block lengths from getbit context. */
  91         bool reset_block_lengths;
  92         /** log2 of current block length. */
  93         int block_len_bits;
  94         /** log2 of next block length. */
  95         int next_block_len_bits;
  96         /** log2 of previous block length. */
  97         int prev_block_len_bits;
  98         /** Block length in samples. */
  99         int block_len;
 100         /** Current position in frame. */
 101         int block_pos;
 102         /** True if channel is coded. */
 103         uint8_t channel_coded[MAX_CHANNELS];
 104         /** log2 ratio frame/exp. length. */
 105         int exponents_bsize[MAX_CHANNELS];
 106
 107         float exponents[MAX_CHANNELS][BLOCK_MAX_SIZE];
 108         float max_exponent[MAX_CHANNELS];
 109         int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
 110         float coefs[MAX_CHANNELS][BLOCK_MAX_SIZE];
 111         float output[BLOCK_MAX_SIZE * 2];
 112         struct mdct_context *mdct_ctx[BLOCK_NB_SIZES];
 113         float *windows[BLOCK_NB_SIZES];
 114         /** Output buffer for one frame and the last for IMDCT windowing. */
 115         float frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
 116         /** Last frame info. */
 117         uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
 118         int last_bitoffset;
 119         int last_superframe_len;
 120         float noise_table[NOISE_TAB_SIZE];
 121         int noise_index;
 122         float noise_mult;       /* XXX: suppress that and integrate it in the noise array */
 123         /* lsp_to_curve tables */
 124         float lsp_cos_table[BLOCK_MAX_SIZE];
 125         float lsp_pow_e_table[256];
 126         float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
 127         float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
 128 };
 129
 130 #define EXPVLCBITS 8
 131 #define HGAINVLCBITS 9
 132 #define VLCBITS 9
 133
 134 /** \cond sine_winows */
 135
 136 #define SINE_WINDOW(x) static float sine_ ## x[x] __a_aligned(16)
 137
 138 SINE_WINDOW(128);
 139 SINE_WINDOW(256);
 140 SINE_WINDOW(512);
 141 SINE_WINDOW(1024);
 142 SINE_WINDOW(2048);
 143 SINE_WINDOW(4096);
 144
 145 static float *sine_windows[6] = {
 146         sine_128, sine_256, sine_512, sine_1024, sine_2048, sine_4096
 147 };
 148 /** \endcond sine_windows */
 149
 150 /* Generate a sine window. */
 151 static void sine_window_init(float *window, int n)
 152 {
 153         int i;
 154
 155         for (i = 0; i < n; i++)
 156                 window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n)));
 157 }
 158
 159 static void init_coef_vlc(struct private_wmadec_data *pwd, int sidx, int didx)
 160 {
 161         const struct coef_vlc_table *src = coef_vlcs + sidx;
 162         struct vlc *dst = pwd->coef_vlc + didx;
 163         int i, l, j, k, level, n = src->n;
 164
 165         init_vlc(dst, VLCBITS, n, src->huffbits, src->huffcodes, 4);
 166         pwd->run_table[didx] = para_malloc(n * sizeof(uint16_t));
 167         pwd->level_table[didx] = para_malloc(n * sizeof(uint16_t));
 168         i = 2;
 169         level = 1;
 170         k = 0;
 171         while (i < n) {
 172                 l = src->levels[k++];
 173                 for (j = 0; j < l; j++) {
 174                         pwd->run_table[didx][i] = j;
 175                         pwd->level_table[didx][i] = level;
 176                         i++;
 177                 }
 178                 level++;
 179         }
 180 }
 181
 182 /* compute the scale factor band sizes for each MDCT block size */
 183 static void compute_scale_factor_band_sizes(struct private_wmadec_data *pwd,
 184         float high_freq)
 185 {
 186         struct asf_header_info *ahi = &pwd->ahi;
 187         int a, b, pos, lpos, k, block_len, i, j, n;
 188         const uint8_t *table;
 189
 190         for (k = 0; k < pwd->nb_block_sizes; k++) {
 191                 int exponent_size;
 192
 193                 block_len = pwd->frame_len >> k;
 194                 table = NULL;
 195                 a = pwd->frame_len_bits - BLOCK_MIN_BITS - k;
 196                 if (a < 3) {
 197                         if (ahi->sample_rate >= 44100)
 198                                 table = exponent_band_44100[a];
 199                         else if (ahi->sample_rate >= 32000)
 200                                 table = exponent_band_32000[a];
 201                         else if (ahi->sample_rate >= 22050)
 202                                 table = exponent_band_22050[a];
 203                 }
 204                 if (table) {
 205                         n = *table++;
 206                         for (i = 0; i < n; i++)
 207                                 pwd->exponent_bands[k][i] = table[i];
 208                         exponent_size = n;
 209                 } else {
 210                         j = 0;
 211                         lpos = 0;
 212                         for (i = 0; i < 25; i++) {
 213                                 a = wma_critical_freqs[i];
 214                                 b = ahi->sample_rate;
 215                                 pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
 216                                 pos <<= 2;
 217                                 if (pos > block_len)
 218                                         pos = block_len;
 219                                 if (pos > lpos)
 220                                         pwd->exponent_bands[k][j++] = pos - lpos;
 221                                 if (pos >= block_len)
 222                                         break;
 223                                 lpos = pos;
 224                         }
 225                         exponent_size = j;
 226                 }
 227
 228                 /* max number of coefs */
 229                 pwd->coefs_end[k] = (pwd->frame_len - ((pwd->frame_len * 9) / 100)) >> k;
 230                 /* high freq computation */
 231                 pwd->high_band_start[k] = (int) ((block_len * 2 * high_freq)
 232                         / ahi->sample_rate + 0.5);
 233                 n = exponent_size;
 234                 j = 0;
 235                 pos = 0;
 236                 for (i = 0; i < n; i++) {
 237                         int start, end;
 238                         start = pos;
 239                         pos += pwd->exponent_bands[k][i];
 240                         end = pos;
 241                         if (start < pwd->high_band_start[k])
 242                                 start = pwd->high_band_start[k];
 243                         if (end > pwd->coefs_end[k])
 244                                 end = pwd->coefs_end[k];
 245                         if (end > start)
 246                                 pwd->exponent_high_bands[k][j++] = end - start;
 247                 }
 248                 pwd->exponent_high_sizes[k] = j;
 249         }
 250 }
 251
 252 static int wma_init(struct private_wmadec_data *pwd)
 253 {
 254         int i;
 255         float bps1, high_freq;
 256         volatile float bps;
 257         int sample_rate1;
 258         int coef_vlc_table;
 259         struct asf_header_info *ahi = &pwd->ahi;
 260         int flags2 = ahi->flags2;
 261
 262         if (ahi->sample_rate <= 0 || ahi->sample_rate > 50000
 263                 || ahi->channels <= 0 || ahi->channels > 8
 264                 || ahi->bit_rate <= 0)
 265                 return -E_WMA_BAD_PARAMS;
 266
 267         /* compute MDCT block size */
 268         if (ahi->sample_rate <= 16000)
 269                 pwd->frame_len_bits = 9;
 270         else if (ahi->sample_rate <= 22050)
 271                 pwd->frame_len_bits = 10;
 272         else
 273                 pwd->frame_len_bits = 11;
 274         pwd->frame_len = 1 << pwd->frame_len_bits;
 275         if (pwd->ahi.use_variable_block_len) {
 276                 int nb_max, nb;
 277                 nb = ((flags2 >> 3) & 3) + 1;
 278                 if ((ahi->bit_rate / ahi->channels) >= 32000)
 279                         nb += 2;
 280                 nb_max = pwd->frame_len_bits - BLOCK_MIN_BITS;
 281                 if (nb > nb_max)
 282                         nb = nb_max;
 283                 pwd->nb_block_sizes = nb + 1;
 284         } else
 285                 pwd->nb_block_sizes = 1;
 286
 287         /* init rate dependent parameters */
 288         pwd->use_noise_coding = 1;
 289         high_freq = ahi->sample_rate * 0.5;
 290
 291         /* wma2 rates are normalized */
 292         sample_rate1 = ahi->sample_rate;
 293         if (sample_rate1 >= 44100)
 294                 sample_rate1 = 44100;
 295         else if (sample_rate1 >= 22050)
 296                 sample_rate1 = 22050;
 297         else if (sample_rate1 >= 16000)
 298                 sample_rate1 = 16000;
 299         else if (sample_rate1 >= 11025)
 300                 sample_rate1 = 11025;
 301         else if (sample_rate1 >= 8000)
 302                 sample_rate1 = 8000;
 303
 304         bps = (float) ahi->bit_rate / (float) (ahi->channels * ahi->sample_rate);
 305         pwd->byte_offset_bits = wma_log2((int) (bps * pwd->frame_len / 8.0 + 0.5)) + 2;
 306         /*
 307          * Compute high frequency value and choose if noise coding should be
 308          * activated.
 309          */
 310         bps1 = bps;
 311         if (ahi->channels == 2)
 312                 bps1 = bps * 1.6;
 313         if (sample_rate1 == 44100) {
 314                 if (bps1 >= 0.61)
 315                         pwd->use_noise_coding = 0;
 316                 else
 317                         high_freq = high_freq * 0.4;
 318         } else if (sample_rate1 == 22050) {
 319                 if (bps1 >= 1.16)
 320                         pwd->use_noise_coding = 0;
 321                 else if (bps1 >= 0.72)
 322                         high_freq = high_freq * 0.7;
 323                 else
 324                         high_freq = high_freq * 0.6;
 325         } else if (sample_rate1 == 16000) {
 326                 if (bps > 0.5)
 327                         high_freq = high_freq * 0.5;
 328                 else
 329                         high_freq = high_freq * 0.3;
 330         } else if (sample_rate1 == 11025)
 331                 high_freq = high_freq * 0.7;
 332         else if (sample_rate1 == 8000) {
 333                 if (bps <= 0.625)
 334                         high_freq = high_freq * 0.5;
 335                 else if (bps > 0.75)
 336                         pwd->use_noise_coding = 0;
 337                 else
 338                         high_freq = high_freq * 0.65;
 339         } else {
 340                 if (bps >= 0.8)
 341                         high_freq = high_freq * 0.75;
 342                 else if (bps >= 0.6)
 343                         high_freq = high_freq * 0.6;
 344                 else
 345                         high_freq = high_freq * 0.5;
 346         }
 347         PARA_INFO_LOG("channels=%u sample_rate=%u "
 348                 "bitrate=%u block_align=%d\n",
 349                 ahi->channels, ahi->sample_rate,
 350                 ahi->bit_rate, ahi->block_align);
 351         PARA_INFO_LOG("frame_len=%d, bps=%f bps1=%f "
 352                 "high_freq=%f bitoffset=%d\n",
 353                 pwd->frame_len, bps, bps1,
 354                 high_freq, pwd->byte_offset_bits);
 355         PARA_INFO_LOG("use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
 356                 pwd->use_noise_coding, pwd->ahi.use_exp_vlc, pwd->nb_block_sizes);
 357
 358         compute_scale_factor_band_sizes(pwd, high_freq);
 359         /* init MDCT windows : simple sinus window */
 360         for (i = 0; i < pwd->nb_block_sizes; i++) {
 361                 int n;
 362                 n = 1 << (pwd->frame_len_bits - i);
 363                 sine_window_init(sine_windows[pwd->frame_len_bits - i - 7], n);
 364                 pwd->windows[i] = sine_windows[pwd->frame_len_bits - i - 7];
 365         }
 366
 367         pwd->reset_block_lengths = true;
 368
 369         if (pwd->use_noise_coding) {
 370                 /* init the noise generator */
 371                 if (pwd->ahi.use_exp_vlc)
 372                         pwd->noise_mult = 0.02;
 373                 else
 374                         pwd->noise_mult = 0.04;
 375
 376                 {
 377                         unsigned int seed;
 378                         float norm;
 379                         seed = 1;
 380                         norm = (1.0 / (float) (1LL << 31)) * sqrt(3) * pwd->noise_mult;
 381                         for (i = 0; i < NOISE_TAB_SIZE; i++) {
 382                                 seed = seed * 314159 + 1;
 383                                 pwd->noise_table[i] = (float) ((int) seed) * norm;
 384                         }
 385                 }
 386         }
 387
 388         /* choose the VLC tables for the coefficients */
 389         coef_vlc_table = 4;
 390         if (ahi->sample_rate >= 32000) {
 391                 if (bps1 < 0.72)
 392                         coef_vlc_table = 0;
 393                 else if (bps1 < 1.16)
 394                         coef_vlc_table = 2;
 395         }
 396         init_coef_vlc(pwd, coef_vlc_table, 0);
 397         init_coef_vlc(pwd, coef_vlc_table + 1, 1);
 398         return 0;
 399 }
 400
 401 static void wma_lsp_to_curve_init(struct private_wmadec_data *pwd)
 402 {
 403         float wdel, a, b;
 404         int i, e, m;
 405
 406         wdel = M_PI / pwd->frame_len;
 407         for (i = 0; i < pwd->frame_len; i++)
 408                 pwd->lsp_cos_table[i] = 2.0f * cos(wdel * i);
 409
 410         /* tables for x^-0.25 computation */
 411         for (i = 0; i < 256; i++) {
 412                 e = i - 126;
 413                 pwd->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
 414         }
 415
 416         /* These two tables are needed to avoid two operations in pow_m1_4. */
 417         b = 1.0;
 418         for (i = (1 << LSP_POW_BITS) - 1; i >= 0; i--) {
 419                 m = (1 << LSP_POW_BITS) + i;
 420                 a = (float) m *(0.5 / (1 << LSP_POW_BITS));
 421                 a = pow(a, -0.25);
 422                 pwd->lsp_pow_m_table1[i] = 2 * a - b;
 423                 pwd->lsp_pow_m_table2[i] = b - a;
 424                 b = a;
 425         }
 426 }
 427
 428 static int wma_decode_init(char *initial_buf, int len, struct private_wmadec_data **result)
 429 {
 430         struct private_wmadec_data *pwd;
 431         int ret, i;
 432
 433         PARA_NOTICE_LOG("initial buf: %d bytes\n", len);
 434         pwd = para_calloc(sizeof(*pwd));
 435         ret = read_asf_header(initial_buf, len, &pwd->ahi);
 436         if (ret <= 0) {
 437                 free(pwd);
 438                 return ret;
 439         }
 440
 441         ret = wma_init(pwd);
 442         if (ret < 0)
 443                 return ret;
 444         /* init MDCT */
 445         for (i = 0; i < pwd->nb_block_sizes; i++) {
 446                 ret = imdct_init(pwd->frame_len_bits - i + 1, &pwd->mdct_ctx[i]);
 447                 if (ret < 0)
 448                         return ret;
 449         }
 450         if (pwd->use_noise_coding) {
 451                 PARA_INFO_LOG("using noise coding\n");
 452                 init_vlc(&pwd->hgain_vlc, HGAINVLCBITS,
 453                         sizeof(wma_hgain_huffbits), wma_hgain_huffbits,
 454                         wma_hgain_huffcodes, 2);
 455         }
 456
 457         if (pwd->ahi.use_exp_vlc) {
 458                 PARA_INFO_LOG("using exp_vlc\n");
 459                 init_vlc(&pwd->exp_vlc, EXPVLCBITS, sizeof(wma_scale_huffbits),
 460                         wma_scale_huffbits, wma_scale_huffcodes, 4);
 461         } else {
 462                 PARA_INFO_LOG("using curve\n");
 463                 wma_lsp_to_curve_init(pwd);
 464         }
 465         *result = pwd;
 466         return pwd->ahi.header_len;
 467 }
 468
 469 /**
 470  * compute x^-0.25 with an exponent and mantissa table. We use linear
 471  * interpolation to reduce the mantissa table size at a small speed
 472  * expense (linear interpolation approximately doubles the number of
 473  * bits of precision).
 474  */
 475 static inline float pow_m1_4(struct private_wmadec_data *pwd, float x)
 476 {
 477         union {
 478                 float f;
 479                 unsigned int v;
 480         } u, t;
 481         unsigned int e, m;
 482         float a, b;
 483
 484         u.f = x;
 485         e = u.v >> 23;
 486         m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
 487         /* build interpolation scale: 1 <= t < 2. */
 488         t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
 489         a = pwd->lsp_pow_m_table1[m];
 490         b = pwd->lsp_pow_m_table2[m];
 491         return pwd->lsp_pow_e_table[e] * (a + b * t.f);
 492 }
 493
 494 static void wma_lsp_to_curve(struct private_wmadec_data *pwd,
 495                 float *out, float *val_max_ptr, int n, float *lsp)
 496 {
 497         int i, j;
 498         float p, q, w, v, val_max;
 499
 500         val_max = 0;
 501         for (i = 0; i < n; i++) {
 502                 p = 0.5f;
 503                 q = 0.5f;
 504                 w = pwd->lsp_cos_table[i];
 505                 for (j = 1; j < NB_LSP_COEFS; j += 2) {
 506                         q *= w - lsp[j - 1];
 507                         p *= w - lsp[j];
 508                 }
 509                 p *= p * (2.0f - w);
 510                 q *= q * (2.0f + w);
 511                 v = p + q;
 512                 v = pow_m1_4(pwd, v);
 513                 if (v > val_max)
 514                         val_max = v;
 515                 out[i] = v;
 516         }
 517         *val_max_ptr = val_max;
 518 }
 519
 520 /* Decode exponents coded with LSP coefficients (same idea as Vorbis). */
 521 static void decode_exp_lsp(struct private_wmadec_data *pwd, int ch)
 522 {
 523         float lsp_coefs[NB_LSP_COEFS];
 524         int val, i;
 525
 526         for (i = 0; i < NB_LSP_COEFS; i++) {
 527                 if (i == 0 || i >= 8)
 528                         val = get_bits(&pwd->gb, 3);
 529                 else
 530                         val = get_bits(&pwd->gb, 4);
 531                 lsp_coefs[i] = wma_lsp_codebook[i][val];
 532         }
 533
 534         wma_lsp_to_curve(pwd, pwd->exponents[ch], &pwd->max_exponent[ch],
 535                 pwd->block_len, lsp_coefs);
 536 }
 537
 538 /* Decode exponents coded with VLC codes. */
 539 static int decode_exp_vlc(struct private_wmadec_data *pwd, int ch)
 540 {
 541         int last_exp, n, code;
 542         const uint16_t *ptr, *band_ptr;
 543         float v, *q, max_scale, *q_end;
 544
 545         band_ptr = pwd->exponent_bands[pwd->frame_len_bits - pwd->block_len_bits];
 546         ptr = band_ptr;
 547         q = pwd->exponents[ch];
 548         q_end = q + pwd->block_len;
 549         max_scale = 0;
 550         last_exp = 36;
 551
 552         while (q < q_end) {
 553                 code = get_vlc(&pwd->gb, &pwd->exp_vlc);
 554                 if (code < 0)
 555                         return code;
 556                 /* NOTE: this offset is the same as MPEG4 AAC ! */
 557                 last_exp += code - 60;
 558                 /* XXX: use a table */
 559                 v = pow(10, last_exp * (1.0 / 16.0));
 560                 if (v > max_scale)
 561                         max_scale = v;
 562                 n = *ptr++;
 563                 do {
 564                         *q++ = v;
 565                 } while (--n);
 566         }
 567         pwd->max_exponent[ch] = max_scale;
 568         return 0;
 569 }
 570
 571 /* compute src0 * src1 + src2 */
 572 static inline void vector_mult_add(float *dst, const float *src0, const float *src1,
 573                 const float *src2, int len)
 574 {
 575         int i;
 576
 577         for (i = 0; i < len; i++)
 578                 dst[i] = src0[i] * src1[i] + src2[i];
 579 }
 580
 581 static inline void vector_mult_reverse(float *dst, const float *src0,
 582                 const float *src1, int len)
 583 {
 584         int i;
 585
 586         src1 += len - 1;
 587         for (i = 0; i < len; i++)
 588                 dst[i] = src0[i] * src1[-i];
 589 }
 590
 591 /**
 592  * Apply MDCT window and add into output.
 593  *
 594  * We ensure that when the windows overlap their squared sum
 595  * is always 1 (MDCT reconstruction rule).
 596  */
 597 static void wma_window(struct private_wmadec_data *pwd, float *out)
 598 {
 599         float *in = pwd->output;
 600         int block_len, bsize, n;
 601
 602         /* left part */
 603         if (pwd->block_len_bits <= pwd->prev_block_len_bits) {
 604                 block_len = pwd->block_len;
 605                 bsize = pwd->frame_len_bits - pwd->block_len_bits;
 606                 vector_mult_add(out, in, pwd->windows[bsize], out, block_len);
 607         } else {
 608                 block_len = 1 << pwd->prev_block_len_bits;
 609                 n = (pwd->block_len - block_len) / 2;
 610                 bsize = pwd->frame_len_bits - pwd->prev_block_len_bits;
 611                 vector_mult_add(out + n, in + n, pwd->windows[bsize], out + n,
 612                         block_len);
 613                 memcpy(out + n + block_len, in + n + block_len,
 614                         n * sizeof(float));
 615         }
 616         out += pwd->block_len;
 617         in += pwd->block_len;
 618         /* right part */
 619         if (pwd->block_len_bits <= pwd->next_block_len_bits) {
 620                 block_len = pwd->block_len;
 621                 bsize = pwd->frame_len_bits - pwd->block_len_bits;
 622                 vector_mult_reverse(out, in, pwd->windows[bsize], block_len);
 623         } else {
 624                 block_len = 1 << pwd->next_block_len_bits;
 625                 n = (pwd->block_len - block_len) / 2;
 626                 bsize = pwd->frame_len_bits - pwd->next_block_len_bits;
 627                 memcpy(out, in, n * sizeof(float));
 628                 vector_mult_reverse(out + n, in + n, pwd->windows[bsize],
 629                         block_len);
 630                 memset(out + n + block_len, 0, n * sizeof(float));
 631         }
 632 }
 633
 634 static int wma_total_gain_to_bits(int total_gain)
 635 {
 636         if (total_gain < 15)
 637                 return 13;
 638         else if (total_gain < 32)
 639                 return 12;
 640         else if (total_gain < 40)
 641                 return 11;
 642         else if (total_gain < 45)
 643                 return 10;
 644         else
 645                 return 9;
 646 }
 647
 648 static int compute_high_band_values(struct private_wmadec_data *pwd,
 649                 int bsize, int nb_coefs[MAX_CHANNELS])
 650 {
 651         int ch;
 652
 653         if (!pwd->use_noise_coding)
 654                 return 0;
 655         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 656                 int i, m, a;
 657                 if (!pwd->channel_coded[ch])
 658                         continue;
 659                 m = pwd->exponent_high_sizes[bsize];
 660                 for (i = 0; i < m; i++) {
 661                         a = get_bit(&pwd->gb);
 662                         pwd->high_band_coded[ch][i] = a;
 663                         if (!a)
 664                                 continue;
 665                         nb_coefs[ch] -= pwd->exponent_high_bands[bsize][i];
 666                 }
 667         }
 668         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 669                 int i, n, val;
 670                 if (!pwd->channel_coded[ch])
 671                         continue;
 672                 n = pwd->exponent_high_sizes[bsize];
 673                 val = (int)0x80000000;
 674                 for (i = 0; i < n; i++) {
 675                         if (!pwd->high_band_coded[ch][i])
 676                                 continue;
 677                         if (val == (int)0x80000000)
 678                                 val = get_bits(&pwd->gb, 7) - 19;
 679                         else {
 680                                 int code = get_vlc(&pwd->gb, &pwd->hgain_vlc);
 681                                 if (code < 0)
 682                                         return code;
 683                                 val += code - 18;
 684                         }
 685                         pwd->high_band_values[ch][i] = val;
 686                 }
 687         }
 688         return 1;
 689 }
 690
 691 static void compute_mdct_coefficients(struct private_wmadec_data *pwd,
 692                 int bsize, int total_gain, int nb_coefs[MAX_CHANNELS])
 693 {
 694         int ch;
 695         float mdct_norm = 1.0 / (pwd->block_len / 2);
 696
 697         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 698                 int16_t *coefs1;
 699                 float *coefs, *exponents, mult, mult1, noise;
 700                 int i, j, n, n1, last_high_band, esize;
 701                 float exp_power[HIGH_BAND_MAX_SIZE];
 702
 703                 if (!pwd->channel_coded[ch])
 704                         continue;
 705                 coefs1 = pwd->coefs1[ch];
 706                 exponents = pwd->exponents[ch];
 707                 esize = pwd->exponents_bsize[ch];
 708                 mult = pow(10, total_gain * 0.05) / pwd->max_exponent[ch];
 709                 mult *= mdct_norm;
 710                 coefs = pwd->coefs[ch];
 711                 if (!pwd->use_noise_coding) {
 712                         /* XXX: optimize more */
 713                         n = nb_coefs[ch];
 714                         for (i = 0; i < n; i++)
 715                                 *coefs++ = coefs1[i] *
 716                                         exponents[i << bsize >> esize] * mult;
 717                         n = pwd->block_len - pwd->coefs_end[bsize];
 718                         for (i = 0; i < n; i++)
 719                                 *coefs++ = 0.0;
 720                         continue;
 721                 }
 722                 n1 = pwd->exponent_high_sizes[bsize];
 723                 /* compute power of high bands */
 724                 exponents = pwd->exponents[ch] +
 725                         (pwd->high_band_start[bsize] << bsize);
 726                 last_high_band = 0; /* avoid warning */
 727                 for (j = 0; j < n1; j++) {
 728                         n = pwd->exponent_high_bands[
 729                                 pwd->frame_len_bits - pwd->block_len_bits][j];
 730                         if (pwd->high_band_coded[ch][j]) {
 731                                 float e2, val;
 732                                 e2 = 0;
 733                                 for (i = 0; i < n; i++) {
 734                                         val = exponents[i << bsize >> esize];
 735                                         e2 += val * val;
 736                                 }
 737                                 exp_power[j] = e2 / n;
 738                                 last_high_band = j;
 739                         }
 740                         exponents += n << bsize;
 741                 }
 742                 /* main freqs and high freqs */
 743                 exponents = pwd->exponents[ch];
 744                 for (j = -1; j < n1; j++) {
 745                         if (j < 0)
 746                                 n = pwd->high_band_start[bsize];
 747                         else
 748                                 n = pwd->exponent_high_bands[pwd->frame_len_bits
 749                                         - pwd->block_len_bits][j];
 750                         if (j >= 0 && pwd->high_band_coded[ch][j]) {
 751                                 /* use noise with specified power */
 752                                 mult1 = sqrt(exp_power[j]
 753                                         / exp_power[last_high_band]);
 754                                 /* XXX: use a table */
 755                                 mult1 *= pow(10, pwd->high_band_values[ch][j] * 0.05);
 756                                 mult1 /= (pwd->max_exponent[ch] * pwd->noise_mult);
 757                                 mult1 *= mdct_norm;
 758                                 for (i = 0; i < n; i++) {
 759                                         noise = pwd->noise_table[pwd->noise_index];
 760                                         pwd->noise_index = (pwd->noise_index + 1)
 761                                                 & (NOISE_TAB_SIZE - 1);
 762                                         *coefs++ = noise * exponents[
 763                                                 i << bsize >> esize] * mult1;
 764                                 }
 765                                 exponents += n << bsize;
 766                         } else {
 767                                 /* coded values + small noise */
 768                                 for (i = 0; i < n; i++) {
 769                                         noise = pwd->noise_table[pwd->noise_index];
 770                                         pwd->noise_index = (pwd->noise_index + 1)
 771                                                 & (NOISE_TAB_SIZE - 1);
 772                                         *coefs++ = ((*coefs1++) + noise) *
 773                                                 exponents[i << bsize >> esize]
 774                                                 * mult;
 775                                 }
 776                                 exponents += n << bsize;
 777                         }
 778                 }
 779                 /* very high freqs: noise */
 780                 n = pwd->block_len - pwd->coefs_end[bsize];
 781                 mult1 = mult * exponents[(-(1 << bsize)) >> esize];
 782                 for (i = 0; i < n; i++) {
 783                         *coefs++ = pwd->noise_table[pwd->noise_index] * mult1;
 784                         pwd->noise_index = (pwd->noise_index + 1)
 785                                 & (NOISE_TAB_SIZE - 1);
 786                 }
 787         }
 788 }
 789
 790 /**
 791  * Returns 0 if OK, 1 if last block of frame, negative on uncorrectable
 792  * errors.
 793  */
 794 static int wma_decode_block(struct private_wmadec_data *pwd)
 795 {
 796         int ret, n, v, ch, code, bsize;
 797         int coef_nb_bits, total_gain;
 798         int nb_coefs[MAX_CHANNELS];
 799         bool ms_stereo = false; /* mid/side stereo mode */
 800
 801         /* compute current block length */
 802         if (pwd->ahi.use_variable_block_len) {
 803                 n = wma_log2(pwd->nb_block_sizes - 1) + 1;
 804
 805                 if (pwd->reset_block_lengths) {
 806                         pwd->reset_block_lengths = false;
 807                         v = get_bits(&pwd->gb, n);
 808                         if (v >= pwd->nb_block_sizes)
 809                                 return -E_WMA_BLOCK_SIZE;
 810                         pwd->prev_block_len_bits = pwd->frame_len_bits - v;
 811                         v = get_bits(&pwd->gb, n);
 812                         if (v >= pwd->nb_block_sizes)
 813                                 return -E_WMA_BLOCK_SIZE;
 814                         pwd->block_len_bits = pwd->frame_len_bits - v;
 815                 } else {
 816                         /* update block lengths */
 817                         pwd->prev_block_len_bits = pwd->block_len_bits;
 818                         pwd->block_len_bits = pwd->next_block_len_bits;
 819                 }
 820                 v = get_bits(&pwd->gb, n);
 821                 if (v >= pwd->nb_block_sizes)
 822                         return -E_WMA_BLOCK_SIZE;
 823                 pwd->next_block_len_bits = pwd->frame_len_bits - v;
 824         } else {
 825                 /* fixed block len */
 826                 pwd->next_block_len_bits = pwd->frame_len_bits;
 827                 pwd->prev_block_len_bits = pwd->frame_len_bits;
 828                 pwd->block_len_bits = pwd->frame_len_bits;
 829         }
 830
 831         /* now check if the block length is coherent with the frame length */
 832         pwd->block_len = 1 << pwd->block_len_bits;
 833         if ((pwd->block_pos + pwd->block_len) > pwd->frame_len)
 834                 return -E_INCOHERENT_BLOCK_LEN;
 835
 836         if (pwd->ahi.channels == 2)
 837                 ms_stereo = get_bit(&pwd->gb);
 838         v = 0;
 839         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 840                 int a = get_bit(&pwd->gb);
 841                 pwd->channel_coded[ch] = a;
 842                 v |= a;
 843         }
 844
 845         bsize = pwd->frame_len_bits - pwd->block_len_bits;
 846
 847         /* if no channel coded, no need to go further */
 848         /* XXX: fix potential framing problems */
 849         if (!v)
 850                 goto next;
 851
 852         /*
 853          * Read total gain and extract corresponding number of bits for coef
 854          * escape coding.
 855          */
 856         total_gain = 1;
 857         for (;;) {
 858                 int a = get_bits(&pwd->gb, 7);
 859                 total_gain += a;
 860                 if (a != 127)
 861                         break;
 862         }
 863
 864         coef_nb_bits = wma_total_gain_to_bits(total_gain);
 865
 866         /* compute number of coefficients */
 867         n = pwd->coefs_end[bsize];
 868         for (ch = 0; ch < pwd->ahi.channels; ch++)
 869                 nb_coefs[ch] = n;
 870
 871         ret = compute_high_band_values(pwd, bsize, nb_coefs);
 872         if (ret < 0)
 873                 return ret;
 874
 875         /* exponents can be reused in short blocks. */
 876         if ((pwd->block_len_bits == pwd->frame_len_bits) || get_bit(&pwd->gb)) {
 877                 for (ch = 0; ch < pwd->ahi.channels; ch++) {
 878                         if (pwd->channel_coded[ch]) {
 879                                 if (pwd->ahi.use_exp_vlc) {
 880                                         ret = decode_exp_vlc(pwd, ch);
 881                                         if (ret < 0)
 882                                                 return ret;
 883                                 } else
 884                                         decode_exp_lsp(pwd, ch);
 885                                 pwd->exponents_bsize[ch] = bsize;
 886                         }
 887                 }
 888         }
 889
 890         /* parse spectral coefficients : just RLE encoding */
 891         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 892                 struct vlc *coef_vlc;
 893                 int level, run, tindex;
 894                 int16_t *ptr, *eptr;
 895                 const uint16_t *level_table, *run_table;
 896
 897                 if (!pwd->channel_coded[ch])
 898                         continue;
 899                 /*
 900                  * special VLC tables are used for ms stereo because there is
 901                  * potentially less energy there
 902                  */
 903                 tindex = ch == 1 && ms_stereo;
 904                 coef_vlc = &pwd->coef_vlc[tindex];
 905                 run_table = pwd->run_table[tindex];
 906                 level_table = pwd->level_table[tindex];
 907                 /* XXX: optimize */
 908                 ptr = &pwd->coefs1[ch][0];
 909                 eptr = ptr + nb_coefs[ch];
 910                 memset(ptr, 0, pwd->block_len * sizeof(int16_t));
 911                 for (;;) {
 912                         code = get_vlc(&pwd->gb, coef_vlc);
 913                         if (code < 0)
 914                                 return code;
 915                         if (code == 1) /* EOB */
 916                                 break;
 917                         if (code == 0) { /* escape */
 918                                 level = get_bits(&pwd->gb, coef_nb_bits);
 919                                 /* reading block_len_bits would be better */
 920                                 run = get_bits(&pwd->gb, pwd->frame_len_bits);
 921                         } else { /* normal code */
 922                                 run = run_table[code];
 923                                 level = level_table[code];
 924                         }
 925                         if (!get_bit(&pwd->gb))
 926                                 level = -level;
 927                         ptr += run;
 928                         if (ptr >= eptr) {
 929                                 PARA_ERROR_LOG("overflow in spectral RLE, ignoring\n");
 930                                 break;
 931                         }
 932                         *ptr++ = level;
 933                         if (ptr >= eptr) /* EOB can be omitted */
 934                                 break;
 935                 }
 936         }
 937         compute_mdct_coefficients(pwd, bsize, total_gain, nb_coefs);
 938         if (ms_stereo && pwd->channel_coded[1]) {
 939                 float a, b;
 940                 int i;
 941                 /*
 942                  * Nominal case for ms stereo: we do it before mdct.
 943                  *
 944                  * No need to optimize this case because it should almost never
 945                  * happen.
 946                  */
 947                 if (!pwd->channel_coded[0]) {
 948                         PARA_NOTICE_LOG("rare ms-stereo\n");
 949                         memset(pwd->coefs[0], 0, sizeof(float) * pwd->block_len);
 950                         pwd->channel_coded[0] = 1;
 951                 }
 952                 for (i = 0; i < pwd->block_len; i++) {
 953                         a = pwd->coefs[0][i];
 954                         b = pwd->coefs[1][i];
 955                         pwd->coefs[0][i] = a + b;
 956                         pwd->coefs[1][i] = a - b;
 957                 }
 958         }
 959 next:
 960         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 961                 int n4, idx;
 962
 963                 n4 = pwd->block_len / 2;
 964                 if (pwd->channel_coded[ch])
 965                         imdct(pwd->mdct_ctx[bsize], pwd->output, pwd->coefs[ch]);
 966                 else if (!(ms_stereo && ch == 1))
 967                         memset(pwd->output, 0, sizeof(pwd->output));
 968
 969                 /* multiply by the window and add in the frame */
 970                 idx = (pwd->frame_len / 2) + pwd->block_pos - n4;
 971                 wma_window(pwd, &pwd->frame_out[ch][idx]);
 972         }
 973
 974         /* update block number */
 975         pwd->block_pos += pwd->block_len;
 976         if (pwd->block_pos >= pwd->frame_len)
 977                 return 1;
 978         else
 979                 return 0;
 980 }
 981
 982 /*
 983  * Clip a signed integer value into the -32768,32767 range.
 984  *
 985  * \param a The value to clip.
 986  *
 987  * \return The clipped value.
 988  */
 989 static inline int16_t av_clip_int16(int a)
 990 {
 991         if ((a + 32768) & ~65535)
 992                 return (a >> 31) ^ 32767;
 993         else
 994                 return a;
 995 }
 996
 997 /* Decode a frame of frame_len samples. */
 998 static int wma_decode_frame(struct private_wmadec_data *pwd, int16_t *samples)
 999 {
1000         int ret, i, ch;
1001         int16_t *ptr;
1002         float *iptr;
1003
1004         /* read each block */
1005         pwd->block_pos = 0;
1006         for (;;) {
1007                 ret = wma_decode_block(pwd);
1008                 if (ret < 0)
1009                         return ret;
1010                 if (ret)
1011                         break;
1012         }
1013
1014         /* convert frame to integer */
1015         for (ch = 0; ch < pwd->ahi.channels; ch++) {
1016                 ptr = samples + ch;
1017                 iptr = pwd->frame_out[ch];
1018
1019                 for (i = 0; i < pwd->frame_len; i++) {
1020                         *ptr = av_clip_int16(lrintf(*iptr++));
1021                         ptr += pwd->ahi.channels;
1022                 }
1023                 /* prepare for next block */
1024                 memmove(&pwd->frame_out[ch][0], &pwd->frame_out[ch][pwd->frame_len],
1025                         pwd->frame_len * sizeof(float));
1026         }
1027         return 0;
1028 }
1029
1030 static int wma_decode_superframe(struct private_wmadec_data *pwd, void *out,
1031                 int *out_size, const uint8_t *in)
1032 {
1033         int ret, in_size = pwd->ahi.packet_size - WMA_FRAME_SKIP;
1034         int16_t *samples = out;
1035
1036         init_get_bits(&pwd->gb, in, in_size);
1037         if (pwd->ahi.use_bit_reservoir) {
1038                 int i, nb_frames, bit_offset, pos, len;
1039                 uint8_t *q;
1040
1041                 /* read super frame header */
1042                 skip_bits(&pwd->gb, 4); /* super frame index */
1043                 nb_frames = get_bits(&pwd->gb, 4) - 1;
1044                 // PARA_DEBUG_LOG("have %d frames\n", nb_frames);
1045                 ret = -E_WMA_OUTPUT_SPACE;
1046                 if ((nb_frames + 1) * pwd->ahi.channels * pwd->frame_len
1047                                 * sizeof(int16_t) > *out_size)
1048                         goto fail;
1049
1050                 bit_offset = get_bits(&pwd->gb, pwd->byte_offset_bits + 3);
1051
1052                 if (pwd->last_superframe_len > 0) {
1053                         /* add bit_offset bits to last frame */
1054                         ret = -E_WMA_BAD_SUPERFRAME;
1055                         if ((pwd->last_superframe_len + ((bit_offset + 7) >> 3)) >
1056                                         MAX_CODED_SUPERFRAME_SIZE)
1057                                 goto fail;
1058                         q = pwd->last_superframe + pwd->last_superframe_len;
1059                         len = bit_offset;
1060                         while (len > 7) {
1061                                 *q++ = get_bits(&pwd->gb, 8);
1062                                 len -= 8;
1063                         }
1064                         if (len > 0)
1065                                 *q++ = get_bits(&pwd->gb, len) << (8 - len);
1066
1067                         /* XXX: bit_offset bits into last frame */
1068                         init_get_bits(&pwd->gb, pwd->last_superframe,
1069                                 MAX_CODED_SUPERFRAME_SIZE);
1070                         /* skip unused bits */
1071                         if (pwd->last_bitoffset > 0)
1072                                 skip_bits(&pwd->gb, pwd->last_bitoffset);
1073                         /*
1074                          * This frame is stored in the last superframe and in
1075                          * the current one.
1076                          */
1077                         ret = wma_decode_frame(pwd, samples);
1078                         if (ret < 0)
1079                                 goto fail;
1080                         samples += pwd->ahi.channels * pwd->frame_len;
1081                 }
1082
1083                 /* read each frame starting from bit_offset */
1084                 pos = bit_offset + 4 + 4 + pwd->byte_offset_bits + 3;
1085                 init_get_bits(&pwd->gb, in + (pos >> 3),
1086                         (MAX_CODED_SUPERFRAME_SIZE - (pos >> 3)));
1087                 len = pos & 7;
1088                 if (len > 0)
1089                         skip_bits(&pwd->gb, len);
1090
1091                 pwd->reset_block_lengths = true;
1092                 for (i = 0; i < nb_frames; i++) {
1093                         ret = wma_decode_frame(pwd, samples);
1094                         if (ret < 0)
1095                                 goto fail;
1096                         samples += pwd->ahi.channels * pwd->frame_len;
1097                 }
1098
1099                 /* we copy the end of the frame in the last frame buffer */
1100                 pos = get_bits_count(&pwd->gb) +
1101                         ((bit_offset + 4 + 4 + pwd->byte_offset_bits + 3) & ~7);
1102                 pwd->last_bitoffset = pos & 7;
1103                 pos >>= 3;
1104                 len = in_size - pos;
1105                 ret = -E_WMA_BAD_SUPERFRAME;
1106                 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0)
1107                         goto fail;
1108                 pwd->last_superframe_len = len;
1109                 memcpy(pwd->last_superframe, in + pos, len);
1110         } else {
1111                 PARA_DEBUG_LOG("not using bit reservoir\n");
1112                 ret = -E_WMA_OUTPUT_SPACE;
1113                 if (pwd->ahi.channels * pwd->frame_len * sizeof(int16_t) > *out_size)
1114                         goto fail;
1115                 /* single frame decode */
1116                 ret = wma_decode_frame(pwd, samples);
1117                 if (ret < 0)
1118                         goto fail;
1119                 samples += pwd->ahi.channels * pwd->frame_len;
1120         }
1121         PARA_DEBUG_LOG("frame_len: %d, block_len: %d, outbytes: %d, eaten: %d\n",
1122                 pwd->frame_len, pwd->block_len,
1123                 (int)((int8_t *)samples - (int8_t *)out), pwd->ahi.block_align);
1124         *out_size = (int8_t *)samples - (int8_t *)out;
1125         return pwd->ahi.block_align;
1126 fail:
1127         /* reset the bit reservoir on errors */
1128         pwd->last_superframe_len = 0;
1129         return ret;
1130 }
1131
1132 static void wmadec_close(struct filter_node *fn)
1133 {
1134         struct private_wmadec_data *pwd = fn->private_data;
1135         int i;
1136
1137         if (!pwd)
1138                 return;
1139         for (i = 0; i < pwd->nb_block_sizes; i++)
1140                 imdct_end(pwd->mdct_ctx[i]);
1141         if (pwd->ahi.use_exp_vlc)
1142                 free_vlc(&pwd->exp_vlc);
1143         if (pwd->use_noise_coding)
1144                 free_vlc(&pwd->hgain_vlc);
1145         for (i = 0; i < 2; i++) {
1146                 free_vlc(&pwd->coef_vlc[i]);
1147                 free(pwd->run_table[i]);
1148                 free(pwd->level_table[i]);
1149         }
1150         free(fn->private_data);
1151         fn->private_data = NULL;
1152 }
1153
1154 static int wmadec_execute(struct btr_node *btrn, const char *cmd, char **result)
1155 {
1156         struct filter_node *fn = btr_context(btrn);
1157         struct private_wmadec_data *pwd = fn->private_data;
1158
1159         return decoder_execute(cmd, pwd->ahi.sample_rate, pwd->ahi.channels,
1160                 result);
1161 }
1162
1163 #define WMA_OUTPUT_BUFFER_SIZE (128 * 1024)
1164
1165 static int wmadec_post_select(__a_unused struct sched *s, void *context)
1166 {
1167         struct filter_node *fn = context;
1168         int ret, converted, out_size;
1169         struct private_wmadec_data *pwd = fn->private_data;
1170         struct btr_node *btrn = fn->btrn;
1171         size_t len;
1172         char *in, *out;
1173
1174 next_buffer:
1175         converted = 0;
1176         ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
1177         if (ret < 0)
1178                 goto err;
1179         if (ret == 0)
1180                 return 0;
1181         btr_merge(btrn, fn->min_iqs);
1182         len = btr_next_buffer(btrn, &in);
1183         ret = -E_WMADEC_EOF;
1184         if (len < fn->min_iqs)
1185                 goto err;
1186         if (!pwd) {
1187                 ret = wma_decode_init(in, len, &pwd);
1188                 if (ret < 0)
1189                         goto err;
1190                 if (ret == 0) {
1191                         fn->min_iqs += 4096;
1192                         goto next_buffer;
1193                 }
1194                 fn->min_iqs = 2 * pwd->ahi.packet_size;
1195                 fn->private_data = pwd;
1196                 converted = pwd->ahi.header_len;
1197                 goto success;
1198         }
1199         fn->min_iqs = pwd->ahi.packet_size;
1200         if (fn->min_iqs > len)
1201                 goto success;
1202         out_size = WMA_OUTPUT_BUFFER_SIZE;
1203         out = para_malloc(out_size);
1204         ret = wma_decode_superframe(pwd, out, &out_size,
1205                 (uint8_t *)in + WMA_FRAME_SKIP);
1206         if (ret < 0) {
1207                 free(out);
1208                 goto err;
1209         }
1210         if (out_size > 0) {
1211                 out = para_realloc(out, out_size);
1212                 btr_add_output(out, out_size, btrn);
1213         } else
1214                 free(out);
1215         converted += pwd->ahi.packet_size;
1216 success:
1217         btr_consume(btrn, converted);
1218         return 0;
1219 err:
1220         assert(ret < 0);
1221         btr_remove_node(&fn->btrn);
1222         return ret;
1223 }
1224
1225 static void wmadec_open(struct filter_node *fn)
1226 {
1227         fn->private_data = NULL;
1228         fn->min_iqs = 4096;
1229 }
1230
1231 const struct filter lsg_filter_cmd_com_wmadec_user_data = {
1232         .open = wmadec_open,
1233         .close = wmadec_close,
1234         .execute = wmadec_execute,
1235         .pre_select = generic_filter_pre_select,
1236         .post_select = wmadec_post_select,
1237 };