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 mid/side stereo mode. */
 103         uint8_t ms_stereo;
 104         /** True if channel is coded. */
 105         uint8_t channel_coded[MAX_CHANNELS];
 106         /** log2 ratio frame/exp. length. */
 107         int exponents_bsize[MAX_CHANNELS];
 108
 109         float exponents[MAX_CHANNELS][BLOCK_MAX_SIZE];
 110         float max_exponent[MAX_CHANNELS];
 111         int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
 112         float coefs[MAX_CHANNELS][BLOCK_MAX_SIZE];
 113         float output[BLOCK_MAX_SIZE * 2];
 114         struct mdct_context *mdct_ctx[BLOCK_NB_SIZES];
 115         float *windows[BLOCK_NB_SIZES];
 116         /** Output buffer for one frame and the last for IMDCT windowing. */
 117         float frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
 118         /** Last frame info. */
 119         uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
 120         int last_bitoffset;
 121         int last_superframe_len;
 122         float noise_table[NOISE_TAB_SIZE];
 123         int noise_index;
 124         float noise_mult;       /* XXX: suppress that and integrate it in the noise array */
 125         /* lsp_to_curve tables */
 126         float lsp_cos_table[BLOCK_MAX_SIZE];
 127         float lsp_pow_e_table[256];
 128         float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
 129         float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
 130 };
 131
 132 #define EXPVLCBITS 8
 133 #define HGAINVLCBITS 9
 134 #define VLCBITS 9
 135
 136 /** \cond sine_winows */
 137
 138 #define SINE_WINDOW(x) static float sine_ ## x[x] __a_aligned(16)
 139
 140 SINE_WINDOW(128);
 141 SINE_WINDOW(256);
 142 SINE_WINDOW(512);
 143 SINE_WINDOW(1024);
 144 SINE_WINDOW(2048);
 145 SINE_WINDOW(4096);
 146
 147 static float *sine_windows[6] = {
 148         sine_128, sine_256, sine_512, sine_1024, sine_2048, sine_4096
 149 };
 150 /** \endcond sine_windows */
 151
 152 /* Generate a sine window. */
 153 static void sine_window_init(float *window, int n)
 154 {
 155         int i;
 156
 157         for (i = 0; i < n; i++)
 158                 window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n)));
 159 }
 160
 161 static void init_coef_vlc(struct private_wmadec_data *pwd, int sidx, int didx)
 162 {
 163         const struct coef_vlc_table *src = coef_vlcs + sidx;
 164         struct vlc *dst = pwd->coef_vlc + didx;
 165         int i, l, j, k, level, n = src->n;
 166
 167         init_vlc(dst, VLCBITS, n, src->huffbits, src->huffcodes, 4);
 168         pwd->run_table[didx] = para_malloc(n * sizeof(uint16_t));
 169         pwd->level_table[didx] = para_malloc(n * sizeof(uint16_t));
 170         i = 2;
 171         level = 1;
 172         k = 0;
 173         while (i < n) {
 174                 l = src->levels[k++];
 175                 for (j = 0; j < l; j++) {
 176                         pwd->run_table[didx][i] = j;
 177                         pwd->level_table[didx][i] = level;
 178                         i++;
 179                 }
 180                 level++;
 181         }
 182 }
 183
 184 /* compute the scale factor band sizes for each MDCT block size */
 185 static void compute_scale_factor_band_sizes(struct private_wmadec_data *pwd,
 186         float high_freq)
 187 {
 188         struct asf_header_info *ahi = &pwd->ahi;
 189         int a, b, pos, lpos, k, block_len, i, j, n;
 190         const uint8_t *table;
 191
 192         for (k = 0; k < pwd->nb_block_sizes; k++) {
 193                 int exponent_size;
 194
 195                 block_len = pwd->frame_len >> k;
 196                 table = NULL;
 197                 a = pwd->frame_len_bits - BLOCK_MIN_BITS - k;
 198                 if (a < 3) {
 199                         if (ahi->sample_rate >= 44100)
 200                                 table = exponent_band_44100[a];
 201                         else if (ahi->sample_rate >= 32000)
 202                                 table = exponent_band_32000[a];
 203                         else if (ahi->sample_rate >= 22050)
 204                                 table = exponent_band_22050[a];
 205                 }
 206                 if (table) {
 207                         n = *table++;
 208                         for (i = 0; i < n; i++)
 209                                 pwd->exponent_bands[k][i] = table[i];
 210                         exponent_size = n;
 211                 } else {
 212                         j = 0;
 213                         lpos = 0;
 214                         for (i = 0; i < 25; i++) {
 215                                 a = wma_critical_freqs[i];
 216                                 b = ahi->sample_rate;
 217                                 pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
 218                                 pos <<= 2;
 219                                 if (pos > block_len)
 220                                         pos = block_len;
 221                                 if (pos > lpos)
 222                                         pwd->exponent_bands[k][j++] = pos - lpos;
 223                                 if (pos >= block_len)
 224                                         break;
 225                                 lpos = pos;
 226                         }
 227                         exponent_size = j;
 228                 }
 229
 230                 /* max number of coefs */
 231                 pwd->coefs_end[k] = (pwd->frame_len - ((pwd->frame_len * 9) / 100)) >> k;
 232                 /* high freq computation */
 233                 pwd->high_band_start[k] = (int) ((block_len * 2 * high_freq)
 234                         / ahi->sample_rate + 0.5);
 235                 n = exponent_size;
 236                 j = 0;
 237                 pos = 0;
 238                 for (i = 0; i < n; i++) {
 239                         int start, end;
 240                         start = pos;
 241                         pos += pwd->exponent_bands[k][i];
 242                         end = pos;
 243                         if (start < pwd->high_band_start[k])
 244                                 start = pwd->high_band_start[k];
 245                         if (end > pwd->coefs_end[k])
 246                                 end = pwd->coefs_end[k];
 247                         if (end > start)
 248                                 pwd->exponent_high_bands[k][j++] = end - start;
 249                 }
 250                 pwd->exponent_high_sizes[k] = j;
 251         }
 252 }
 253
 254 static int wma_init(struct private_wmadec_data *pwd)
 255 {
 256         int i;
 257         float bps1, high_freq;
 258         volatile float bps;
 259         int sample_rate1;
 260         int coef_vlc_table;
 261         struct asf_header_info *ahi = &pwd->ahi;
 262         int flags2 = ahi->flags2;
 263
 264         if (ahi->sample_rate <= 0 || ahi->sample_rate > 50000
 265                 || ahi->channels <= 0 || ahi->channels > 8
 266                 || ahi->bit_rate <= 0)
 267                 return -E_WMA_BAD_PARAMS;
 268
 269         /* compute MDCT block size */
 270         if (ahi->sample_rate <= 16000)
 271                 pwd->frame_len_bits = 9;
 272         else if (ahi->sample_rate <= 22050)
 273                 pwd->frame_len_bits = 10;
 274         else
 275                 pwd->frame_len_bits = 11;
 276         pwd->frame_len = 1 << pwd->frame_len_bits;
 277         if (pwd->ahi.use_variable_block_len) {
 278                 int nb_max, nb;
 279                 nb = ((flags2 >> 3) & 3) + 1;
 280                 if ((ahi->bit_rate / ahi->channels) >= 32000)
 281                         nb += 2;
 282                 nb_max = pwd->frame_len_bits - BLOCK_MIN_BITS;
 283                 if (nb > nb_max)
 284                         nb = nb_max;
 285                 pwd->nb_block_sizes = nb + 1;
 286         } else
 287                 pwd->nb_block_sizes = 1;
 288
 289         /* init rate dependent parameters */
 290         pwd->use_noise_coding = 1;
 291         high_freq = ahi->sample_rate * 0.5;
 292
 293         /* wma2 rates are normalized */
 294         sample_rate1 = ahi->sample_rate;
 295         if (sample_rate1 >= 44100)
 296                 sample_rate1 = 44100;
 297         else if (sample_rate1 >= 22050)
 298                 sample_rate1 = 22050;
 299         else if (sample_rate1 >= 16000)
 300                 sample_rate1 = 16000;
 301         else if (sample_rate1 >= 11025)
 302                 sample_rate1 = 11025;
 303         else if (sample_rate1 >= 8000)
 304                 sample_rate1 = 8000;
 305
 306         bps = (float) ahi->bit_rate / (float) (ahi->channels * ahi->sample_rate);
 307         pwd->byte_offset_bits = wma_log2((int) (bps * pwd->frame_len / 8.0 + 0.5)) + 2;
 308         /*
 309          * Compute high frequency value and choose if noise coding should be
 310          * activated.
 311          */
 312         bps1 = bps;
 313         if (ahi->channels == 2)
 314                 bps1 = bps * 1.6;
 315         if (sample_rate1 == 44100) {
 316                 if (bps1 >= 0.61)
 317                         pwd->use_noise_coding = 0;
 318                 else
 319                         high_freq = high_freq * 0.4;
 320         } else if (sample_rate1 == 22050) {
 321                 if (bps1 >= 1.16)
 322                         pwd->use_noise_coding = 0;
 323                 else if (bps1 >= 0.72)
 324                         high_freq = high_freq * 0.7;
 325                 else
 326                         high_freq = high_freq * 0.6;
 327         } else if (sample_rate1 == 16000) {
 328                 if (bps > 0.5)
 329                         high_freq = high_freq * 0.5;
 330                 else
 331                         high_freq = high_freq * 0.3;
 332         } else if (sample_rate1 == 11025)
 333                 high_freq = high_freq * 0.7;
 334         else if (sample_rate1 == 8000) {
 335                 if (bps <= 0.625)
 336                         high_freq = high_freq * 0.5;
 337                 else if (bps > 0.75)
 338                         pwd->use_noise_coding = 0;
 339                 else
 340                         high_freq = high_freq * 0.65;
 341         } else {
 342                 if (bps >= 0.8)
 343                         high_freq = high_freq * 0.75;
 344                 else if (bps >= 0.6)
 345                         high_freq = high_freq * 0.6;
 346                 else
 347                         high_freq = high_freq * 0.5;
 348         }
 349         PARA_INFO_LOG("channels=%u sample_rate=%u "
 350                 "bitrate=%u block_align=%d\n",
 351                 ahi->channels, ahi->sample_rate,
 352                 ahi->bit_rate, ahi->block_align);
 353         PARA_INFO_LOG("frame_len=%d, bps=%f bps1=%f "
 354                 "high_freq=%f bitoffset=%d\n",
 355                 pwd->frame_len, bps, bps1,
 356                 high_freq, pwd->byte_offset_bits);
 357         PARA_INFO_LOG("use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
 358                 pwd->use_noise_coding, pwd->ahi.use_exp_vlc, pwd->nb_block_sizes);
 359
 360         compute_scale_factor_band_sizes(pwd, high_freq);
 361         /* init MDCT windows : simple sinus window */
 362         for (i = 0; i < pwd->nb_block_sizes; i++) {
 363                 int n;
 364                 n = 1 << (pwd->frame_len_bits - i);
 365                 sine_window_init(sine_windows[pwd->frame_len_bits - i - 7], n);
 366                 pwd->windows[i] = sine_windows[pwd->frame_len_bits - i - 7];
 367         }
 368
 369         pwd->reset_block_lengths = true;
 370
 371         if (pwd->use_noise_coding) {
 372                 /* init the noise generator */
 373                 if (pwd->ahi.use_exp_vlc)
 374                         pwd->noise_mult = 0.02;
 375                 else
 376                         pwd->noise_mult = 0.04;
 377
 378                 {
 379                         unsigned int seed;
 380                         float norm;
 381                         seed = 1;
 382                         norm = (1.0 / (float) (1LL << 31)) * sqrt(3) * pwd->noise_mult;
 383                         for (i = 0; i < NOISE_TAB_SIZE; i++) {
 384                                 seed = seed * 314159 + 1;
 385                                 pwd->noise_table[i] = (float) ((int) seed) * norm;
 386                         }
 387                 }
 388         }
 389
 390         /* choose the VLC tables for the coefficients */
 391         coef_vlc_table = 4;
 392         if (ahi->sample_rate >= 32000) {
 393                 if (bps1 < 0.72)
 394                         coef_vlc_table = 0;
 395                 else if (bps1 < 1.16)
 396                         coef_vlc_table = 2;
 397         }
 398         init_coef_vlc(pwd, coef_vlc_table, 0);
 399         init_coef_vlc(pwd, coef_vlc_table + 1, 1);
 400         return 0;
 401 }
 402
 403 static void wma_lsp_to_curve_init(struct private_wmadec_data *pwd)
 404 {
 405         float wdel, a, b;
 406         int i, e, m;
 407
 408         wdel = M_PI / pwd->frame_len;
 409         for (i = 0; i < pwd->frame_len; i++)
 410                 pwd->lsp_cos_table[i] = 2.0f * cos(wdel * i);
 411
 412         /* tables for x^-0.25 computation */
 413         for (i = 0; i < 256; i++) {
 414                 e = i - 126;
 415                 pwd->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
 416         }
 417
 418         /* These two tables are needed to avoid two operations in pow_m1_4. */
 419         b = 1.0;
 420         for (i = (1 << LSP_POW_BITS) - 1; i >= 0; i--) {
 421                 m = (1 << LSP_POW_BITS) + i;
 422                 a = (float) m *(0.5 / (1 << LSP_POW_BITS));
 423                 a = pow(a, -0.25);
 424                 pwd->lsp_pow_m_table1[i] = 2 * a - b;
 425                 pwd->lsp_pow_m_table2[i] = b - a;
 426                 b = a;
 427         }
 428 }
 429
 430 static int wma_decode_init(char *initial_buf, int len, struct private_wmadec_data **result)
 431 {
 432         struct private_wmadec_data *pwd;
 433         int ret, i;
 434
 435         PARA_NOTICE_LOG("initial buf: %d bytes\n", len);
 436         pwd = para_calloc(sizeof(*pwd));
 437         ret = read_asf_header(initial_buf, len, &pwd->ahi);
 438         if (ret <= 0) {
 439                 free(pwd);
 440                 return ret;
 441         }
 442
 443         ret = wma_init(pwd);
 444         if (ret < 0)
 445                 return ret;
 446         /* init MDCT */
 447         for (i = 0; i < pwd->nb_block_sizes; i++) {
 448                 ret = imdct_init(pwd->frame_len_bits - i + 1, &pwd->mdct_ctx[i]);
 449                 if (ret < 0)
 450                         return ret;
 451         }
 452         if (pwd->use_noise_coding) {
 453                 PARA_INFO_LOG("using noise coding\n");
 454                 init_vlc(&pwd->hgain_vlc, HGAINVLCBITS,
 455                         sizeof(wma_hgain_huffbits), wma_hgain_huffbits,
 456                         wma_hgain_huffcodes, 2);
 457         }
 458
 459         if (pwd->ahi.use_exp_vlc) {
 460                 PARA_INFO_LOG("using exp_vlc\n");
 461                 init_vlc(&pwd->exp_vlc, EXPVLCBITS, sizeof(wma_scale_huffbits),
 462                         wma_scale_huffbits, wma_scale_huffcodes, 4);
 463         } else {
 464                 PARA_INFO_LOG("using curve\n");
 465                 wma_lsp_to_curve_init(pwd);
 466         }
 467         *result = pwd;
 468         return pwd->ahi.header_len;
 469 }
 470
 471 /**
 472  * compute x^-0.25 with an exponent and mantissa table. We use linear
 473  * interpolation to reduce the mantissa table size at a small speed
 474  * expense (linear interpolation approximately doubles the number of
 475  * bits of precision).
 476  */
 477 static inline float pow_m1_4(struct private_wmadec_data *pwd, float x)
 478 {
 479         union {
 480                 float f;
 481                 unsigned int v;
 482         } u, t;
 483         unsigned int e, m;
 484         float a, b;
 485
 486         u.f = x;
 487         e = u.v >> 23;
 488         m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
 489         /* build interpolation scale: 1 <= t < 2. */
 490         t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
 491         a = pwd->lsp_pow_m_table1[m];
 492         b = pwd->lsp_pow_m_table2[m];
 493         return pwd->lsp_pow_e_table[e] * (a + b * t.f);
 494 }
 495
 496 static void wma_lsp_to_curve(struct private_wmadec_data *pwd,
 497                 float *out, float *val_max_ptr, int n, float *lsp)
 498 {
 499         int i, j;
 500         float p, q, w, v, val_max;
 501
 502         val_max = 0;
 503         for (i = 0; i < n; i++) {
 504                 p = 0.5f;
 505                 q = 0.5f;
 506                 w = pwd->lsp_cos_table[i];
 507                 for (j = 1; j < NB_LSP_COEFS; j += 2) {
 508                         q *= w - lsp[j - 1];
 509                         p *= w - lsp[j];
 510                 }
 511                 p *= p * (2.0f - w);
 512                 q *= q * (2.0f + w);
 513                 v = p + q;
 514                 v = pow_m1_4(pwd, v);
 515                 if (v > val_max)
 516                         val_max = v;
 517                 out[i] = v;
 518         }
 519         *val_max_ptr = val_max;
 520 }
 521
 522 /* Decode exponents coded with LSP coefficients (same idea as Vorbis). */
 523 static void decode_exp_lsp(struct private_wmadec_data *pwd, int ch)
 524 {
 525         float lsp_coefs[NB_LSP_COEFS];
 526         int val, i;
 527
 528         for (i = 0; i < NB_LSP_COEFS; i++) {
 529                 if (i == 0 || i >= 8)
 530                         val = get_bits(&pwd->gb, 3);
 531                 else
 532                         val = get_bits(&pwd->gb, 4);
 533                 lsp_coefs[i] = wma_lsp_codebook[i][val];
 534         }
 535
 536         wma_lsp_to_curve(pwd, pwd->exponents[ch], &pwd->max_exponent[ch],
 537                 pwd->block_len, lsp_coefs);
 538 }
 539
 540 /* Decode exponents coded with VLC codes. */
 541 static int decode_exp_vlc(struct private_wmadec_data *pwd, int ch)
 542 {
 543         int last_exp, n, code;
 544         const uint16_t *ptr, *band_ptr;
 545         float v, *q, max_scale, *q_end;
 546
 547         band_ptr = pwd->exponent_bands[pwd->frame_len_bits - pwd->block_len_bits];
 548         ptr = band_ptr;
 549         q = pwd->exponents[ch];
 550         q_end = q + pwd->block_len;
 551         max_scale = 0;
 552         last_exp = 36;
 553
 554         while (q < q_end) {
 555                 code = get_vlc(&pwd->gb, &pwd->exp_vlc);
 556                 if (code < 0)
 557                         return code;
 558                 /* NOTE: this offset is the same as MPEG4 AAC ! */
 559                 last_exp += code - 60;
 560                 /* XXX: use a table */
 561                 v = pow(10, last_exp * (1.0 / 16.0));
 562                 if (v > max_scale)
 563                         max_scale = v;
 564                 n = *ptr++;
 565                 do {
 566                         *q++ = v;
 567                 } while (--n);
 568         }
 569         pwd->max_exponent[ch] = max_scale;
 570         return 0;
 571 }
 572
 573 /* compute src0 * src1 + src2 */
 574 static inline void vector_mult_add(float *dst, const float *src0, const float *src1,
 575                 const float *src2, int len)
 576 {
 577         int i;
 578
 579         for (i = 0; i < len; i++)
 580                 dst[i] = src0[i] * src1[i] + src2[i];
 581 }
 582
 583 static inline void vector_mult_reverse(float *dst, const float *src0,
 584                 const float *src1, int len)
 585 {
 586         int i;
 587
 588         src1 += len - 1;
 589         for (i = 0; i < len; i++)
 590                 dst[i] = src0[i] * src1[-i];
 591 }
 592
 593 /**
 594  * Apply MDCT window and add into output.
 595  *
 596  * We ensure that when the windows overlap their squared sum
 597  * is always 1 (MDCT reconstruction rule).
 598  */
 599 static void wma_window(struct private_wmadec_data *pwd, float *out)
 600 {
 601         float *in = pwd->output;
 602         int block_len, bsize, n;
 603
 604         /* left part */
 605         if (pwd->block_len_bits <= pwd->prev_block_len_bits) {
 606                 block_len = pwd->block_len;
 607                 bsize = pwd->frame_len_bits - pwd->block_len_bits;
 608                 vector_mult_add(out, in, pwd->windows[bsize], out, block_len);
 609         } else {
 610                 block_len = 1 << pwd->prev_block_len_bits;
 611                 n = (pwd->block_len - block_len) / 2;
 612                 bsize = pwd->frame_len_bits - pwd->prev_block_len_bits;
 613                 vector_mult_add(out + n, in + n, pwd->windows[bsize], out + n,
 614                         block_len);
 615                 memcpy(out + n + block_len, in + n + block_len,
 616                         n * sizeof(float));
 617         }
 618         out += pwd->block_len;
 619         in += pwd->block_len;
 620         /* right part */
 621         if (pwd->block_len_bits <= pwd->next_block_len_bits) {
 622                 block_len = pwd->block_len;
 623                 bsize = pwd->frame_len_bits - pwd->block_len_bits;
 624                 vector_mult_reverse(out, in, pwd->windows[bsize], block_len);
 625         } else {
 626                 block_len = 1 << pwd->next_block_len_bits;
 627                 n = (pwd->block_len - block_len) / 2;
 628                 bsize = pwd->frame_len_bits - pwd->next_block_len_bits;
 629                 memcpy(out, in, n * sizeof(float));
 630                 vector_mult_reverse(out + n, in + n, pwd->windows[bsize],
 631                         block_len);
 632                 memset(out + n + block_len, 0, n * sizeof(float));
 633         }
 634 }
 635
 636 static int wma_total_gain_to_bits(int total_gain)
 637 {
 638         if (total_gain < 15)
 639                 return 13;
 640         else if (total_gain < 32)
 641                 return 12;
 642         else if (total_gain < 40)
 643                 return 11;
 644         else if (total_gain < 45)
 645                 return 10;
 646         else
 647                 return 9;
 648 }
 649
 650 static int compute_high_band_values(struct private_wmadec_data *pwd,
 651                 int bsize, int nb_coefs[MAX_CHANNELS])
 652 {
 653         int ch;
 654
 655         if (!pwd->use_noise_coding)
 656                 return 0;
 657         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 658                 int i, m, a;
 659                 if (!pwd->channel_coded[ch])
 660                         continue;
 661                 m = pwd->exponent_high_sizes[bsize];
 662                 for (i = 0; i < m; i++) {
 663                         a = get_bit(&pwd->gb);
 664                         pwd->high_band_coded[ch][i] = a;
 665                         if (!a)
 666                                 continue;
 667                         nb_coefs[ch] -= pwd->exponent_high_bands[bsize][i];
 668                 }
 669         }
 670         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 671                 int i, n, val;
 672                 if (!pwd->channel_coded[ch])
 673                         continue;
 674                 n = pwd->exponent_high_sizes[bsize];
 675                 val = (int)0x80000000;
 676                 for (i = 0; i < n; i++) {
 677                         if (!pwd->high_band_coded[ch][i])
 678                                 continue;
 679                         if (val == (int)0x80000000)
 680                                 val = get_bits(&pwd->gb, 7) - 19;
 681                         else {
 682                                 int code = get_vlc(&pwd->gb, &pwd->hgain_vlc);
 683                                 if (code < 0)
 684                                         return code;
 685                                 val += code - 18;
 686                         }
 687                         pwd->high_band_values[ch][i] = val;
 688                 }
 689         }
 690         return 1;
 691 }
 692
 693 static void compute_mdct_coefficients(struct private_wmadec_data *pwd,
 694                 int bsize, int total_gain, int nb_coefs[MAX_CHANNELS])
 695 {
 696         int ch;
 697         float mdct_norm = 1.0 / (pwd->block_len / 2);
 698
 699         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 700                 int16_t *coefs1;
 701                 float *coefs, *exponents, mult, mult1, noise;
 702                 int i, j, n, n1, last_high_band, esize;
 703                 float exp_power[HIGH_BAND_MAX_SIZE];
 704
 705                 if (!pwd->channel_coded[ch])
 706                         continue;
 707                 coefs1 = pwd->coefs1[ch];
 708                 exponents = pwd->exponents[ch];
 709                 esize = pwd->exponents_bsize[ch];
 710                 mult = pow(10, total_gain * 0.05) / pwd->max_exponent[ch];
 711                 mult *= mdct_norm;
 712                 coefs = pwd->coefs[ch];
 713                 if (!pwd->use_noise_coding) {
 714                         /* XXX: optimize more */
 715                         n = nb_coefs[ch];
 716                         for (i = 0; i < n; i++)
 717                                 *coefs++ = coefs1[i] *
 718                                         exponents[i << bsize >> esize] * mult;
 719                         n = pwd->block_len - pwd->coefs_end[bsize];
 720                         for (i = 0; i < n; i++)
 721                                 *coefs++ = 0.0;
 722                         continue;
 723                 }
 724                 n1 = pwd->exponent_high_sizes[bsize];
 725                 /* compute power of high bands */
 726                 exponents = pwd->exponents[ch] +
 727                         (pwd->high_band_start[bsize] << bsize);
 728                 last_high_band = 0; /* avoid warning */
 729                 for (j = 0; j < n1; j++) {
 730                         n = pwd->exponent_high_bands[
 731                                 pwd->frame_len_bits - pwd->block_len_bits][j];
 732                         if (pwd->high_band_coded[ch][j]) {
 733                                 float e2, val;
 734                                 e2 = 0;
 735                                 for (i = 0; i < n; i++) {
 736                                         val = exponents[i << bsize >> esize];
 737                                         e2 += val * val;
 738                                 }
 739                                 exp_power[j] = e2 / n;
 740                                 last_high_band = j;
 741                         }
 742                         exponents += n << bsize;
 743                 }
 744                 /* main freqs and high freqs */
 745                 exponents = pwd->exponents[ch];
 746                 for (j = -1; j < n1; j++) {
 747                         if (j < 0)
 748                                 n = pwd->high_band_start[bsize];
 749                         else
 750                                 n = pwd->exponent_high_bands[pwd->frame_len_bits
 751                                         - pwd->block_len_bits][j];
 752                         if (j >= 0 && pwd->high_band_coded[ch][j]) {
 753                                 /* use noise with specified power */
 754                                 mult1 = sqrt(exp_power[j]
 755                                         / exp_power[last_high_band]);
 756                                 /* XXX: use a table */
 757                                 mult1 *= pow(10, pwd->high_band_values[ch][j] * 0.05);
 758                                 mult1 /= (pwd->max_exponent[ch] * pwd->noise_mult);
 759                                 mult1 *= mdct_norm;
 760                                 for (i = 0; i < n; i++) {
 761                                         noise = pwd->noise_table[pwd->noise_index];
 762                                         pwd->noise_index = (pwd->noise_index + 1)
 763                                                 & (NOISE_TAB_SIZE - 1);
 764                                         *coefs++ = noise * exponents[
 765                                                 i << bsize >> esize] * mult1;
 766                                 }
 767                                 exponents += n << bsize;
 768                         } else {
 769                                 /* coded values + small noise */
 770                                 for (i = 0; i < n; i++) {
 771                                         noise = pwd->noise_table[pwd->noise_index];
 772                                         pwd->noise_index = (pwd->noise_index + 1)
 773                                                 & (NOISE_TAB_SIZE - 1);
 774                                         *coefs++ = ((*coefs1++) + noise) *
 775                                                 exponents[i << bsize >> esize]
 776                                                 * mult;
 777                                 }
 778                                 exponents += n << bsize;
 779                         }
 780                 }
 781                 /* very high freqs: noise */
 782                 n = pwd->block_len - pwd->coefs_end[bsize];
 783                 mult1 = mult * exponents[(-(1 << bsize)) >> esize];
 784                 for (i = 0; i < n; i++) {
 785                         *coefs++ = pwd->noise_table[pwd->noise_index] * mult1;
 786                         pwd->noise_index = (pwd->noise_index + 1)
 787                                 & (NOISE_TAB_SIZE - 1);
 788                 }
 789         }
 790 }
 791
 792 /**
 793  * Returns 0 if OK, 1 if last block of frame, negative on uncorrectable
 794  * errors.
 795  */
 796 static int wma_decode_block(struct private_wmadec_data *pwd)
 797 {
 798         int ret, n, v, ch, code, bsize;
 799         int coef_nb_bits, total_gain;
 800         int nb_coefs[MAX_CHANNELS];
 801
 802         /* compute current block length */
 803         if (pwd->ahi.use_variable_block_len) {
 804                 n = wma_log2(pwd->nb_block_sizes - 1) + 1;
 805
 806                 if (pwd->reset_block_lengths) {
 807                         pwd->reset_block_lengths = false;
 808                         v = get_bits(&pwd->gb, n);
 809                         if (v >= pwd->nb_block_sizes)
 810                                 return -E_WMA_BLOCK_SIZE;
 811                         pwd->prev_block_len_bits = pwd->frame_len_bits - v;
 812                         v = get_bits(&pwd->gb, n);
 813                         if (v >= pwd->nb_block_sizes)
 814                                 return -E_WMA_BLOCK_SIZE;
 815                         pwd->block_len_bits = pwd->frame_len_bits - v;
 816                 } else {
 817                         /* update block lengths */
 818                         pwd->prev_block_len_bits = pwd->block_len_bits;
 819                         pwd->block_len_bits = pwd->next_block_len_bits;
 820                 }
 821                 v = get_bits(&pwd->gb, n);
 822                 if (v >= pwd->nb_block_sizes)
 823                         return -E_WMA_BLOCK_SIZE;
 824                 pwd->next_block_len_bits = pwd->frame_len_bits - v;
 825         } else {
 826                 /* fixed block len */
 827                 pwd->next_block_len_bits = pwd->frame_len_bits;
 828                 pwd->prev_block_len_bits = pwd->frame_len_bits;
 829                 pwd->block_len_bits = pwd->frame_len_bits;
 830         }
 831
 832         /* now check if the block length is coherent with the frame length */
 833         pwd->block_len = 1 << pwd->block_len_bits;
 834         if ((pwd->block_pos + pwd->block_len) > pwd->frame_len)
 835                 return -E_INCOHERENT_BLOCK_LEN;
 836
 837         if (pwd->ahi.channels == 2)
 838                 pwd->ms_stereo = get_bit(&pwd->gb);
 839         v = 0;
 840         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 841                 int a = get_bit(&pwd->gb);
 842                 pwd->channel_coded[ch] = a;
 843                 v |= a;
 844         }
 845
 846         bsize = pwd->frame_len_bits - pwd->block_len_bits;
 847
 848         /* if no channel coded, no need to go further */
 849         /* XXX: fix potential framing problems */
 850         if (!v)
 851                 goto next;
 852
 853         /*
 854          * Read total gain and extract corresponding number of bits for coef
 855          * escape coding.
 856          */
 857         total_gain = 1;
 858         for (;;) {
 859                 int a = get_bits(&pwd->gb, 7);
 860                 total_gain += a;
 861                 if (a != 127)
 862                         break;
 863         }
 864
 865         coef_nb_bits = wma_total_gain_to_bits(total_gain);
 866
 867         /* compute number of coefficients */
 868         n = pwd->coefs_end[bsize];
 869         for (ch = 0; ch < pwd->ahi.channels; ch++)
 870                 nb_coefs[ch] = n;
 871
 872         ret = compute_high_band_values(pwd, bsize, nb_coefs);
 873         if (ret < 0)
 874                 return ret;
 875
 876         /* exponents can be reused in short blocks. */
 877         if ((pwd->block_len_bits == pwd->frame_len_bits) || get_bit(&pwd->gb)) {
 878                 for (ch = 0; ch < pwd->ahi.channels; ch++) {
 879                         if (pwd->channel_coded[ch]) {
 880                                 if (pwd->ahi.use_exp_vlc) {
 881                                         ret = decode_exp_vlc(pwd, ch);
 882                                         if (ret < 0)
 883                                                 return ret;
 884                                 } else
 885                                         decode_exp_lsp(pwd, ch);
 886                                 pwd->exponents_bsize[ch] = bsize;
 887                         }
 888                 }
 889         }
 890
 891         /* parse spectral coefficients : just RLE encoding */
 892         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 893                 struct vlc *coef_vlc;
 894                 int level, run, tindex;
 895                 int16_t *ptr, *eptr;
 896                 const uint16_t *level_table, *run_table;
 897
 898                 if (!pwd->channel_coded[ch])
 899                         continue;
 900                 /*
 901                  * special VLC tables are used for ms stereo because there is
 902                  * potentially less energy there
 903                  */
 904                 tindex = (ch == 1 && pwd->ms_stereo);
 905                 coef_vlc = &pwd->coef_vlc[tindex];
 906                 run_table = pwd->run_table[tindex];
 907                 level_table = pwd->level_table[tindex];
 908                 /* XXX: optimize */
 909                 ptr = &pwd->coefs1[ch][0];
 910                 eptr = ptr + nb_coefs[ch];
 911                 memset(ptr, 0, pwd->block_len * sizeof(int16_t));
 912                 for (;;) {
 913                         code = get_vlc(&pwd->gb, coef_vlc);
 914                         if (code < 0)
 915                                 return code;
 916                         if (code == 1) /* EOB */
 917                                 break;
 918                         if (code == 0) { /* escape */
 919                                 level = get_bits(&pwd->gb, coef_nb_bits);
 920                                 /* reading block_len_bits would be better */
 921                                 run = get_bits(&pwd->gb, pwd->frame_len_bits);
 922                         } else { /* normal code */
 923                                 run = run_table[code];
 924                                 level = level_table[code];
 925                         }
 926                         if (!get_bit(&pwd->gb))
 927                                 level = -level;
 928                         ptr += run;
 929                         if (ptr >= eptr) {
 930                                 PARA_ERROR_LOG("overflow in spectral RLE, ignoring\n");
 931                                 break;
 932                         }
 933                         *ptr++ = level;
 934                         if (ptr >= eptr) /* EOB can be omitted */
 935                                 break;
 936                 }
 937         }
 938         compute_mdct_coefficients(pwd, bsize, total_gain, nb_coefs);
 939         if (pwd->ms_stereo && pwd->channel_coded[1]) {
 940                 float a, b;
 941                 int i;
 942                 /*
 943                  * Nominal case for ms stereo: we do it before mdct.
 944                  *
 945                  * No need to optimize this case because it should almost never
 946                  * happen.
 947                  */
 948                 if (!pwd->channel_coded[0]) {
 949                         PARA_NOTICE_LOG("rare ms-stereo\n");
 950                         memset(pwd->coefs[0], 0, sizeof(float) * pwd->block_len);
 951                         pwd->channel_coded[0] = 1;
 952                 }
 953                 for (i = 0; i < pwd->block_len; i++) {
 954                         a = pwd->coefs[0][i];
 955                         b = pwd->coefs[1][i];
 956                         pwd->coefs[0][i] = a + b;
 957                         pwd->coefs[1][i] = a - b;
 958                 }
 959         }
 960 next:
 961         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 962                 int n4, idx;
 963
 964                 n4 = pwd->block_len / 2;
 965                 if (pwd->channel_coded[ch])
 966                         imdct(pwd->mdct_ctx[bsize], pwd->output, pwd->coefs[ch]);
 967                 else if (!(pwd->ms_stereo && ch == 1))
 968                         memset(pwd->output, 0, sizeof(pwd->output));
 969
 970                 /* multiply by the window and add in the frame */
 971                 idx = (pwd->frame_len / 2) + pwd->block_pos - n4;
 972                 wma_window(pwd, &pwd->frame_out[ch][idx]);
 973         }
 974
 975         /* update block number */
 976         pwd->block_pos += pwd->block_len;
 977         if (pwd->block_pos >= pwd->frame_len)
 978                 return 1;
 979         else
 980                 return 0;
 981 }
 982
 983 /*
 984  * Clip a signed integer value into the -32768,32767 range.
 985  *
 986  * \param a The value to clip.
 987  *
 988  * \return The clipped value.
 989  */
 990 static inline int16_t av_clip_int16(int a)
 991 {
 992         if ((a + 32768) & ~65535)
 993                 return (a >> 31) ^ 32767;
 994         else
 995                 return a;
 996 }
 997
 998 /* Decode a frame of frame_len samples. */
 999 static int wma_decode_frame(struct private_wmadec_data *pwd, int16_t *samples)
1000 {
1001         int ret, i, ch;
1002         int16_t *ptr;
1003         float *iptr;
1004
1005         /* read each block */
1006         pwd->block_pos = 0;
1007         for (;;) {
1008                 ret = wma_decode_block(pwd);
1009                 if (ret < 0)
1010                         return ret;
1011                 if (ret)
1012                         break;
1013         }
1014
1015         /* convert frame to integer */
1016         for (ch = 0; ch < pwd->ahi.channels; ch++) {
1017                 ptr = samples + ch;
1018                 iptr = pwd->frame_out[ch];
1019
1020                 for (i = 0; i < pwd->frame_len; i++) {
1021                         *ptr = av_clip_int16(lrintf(*iptr++));
1022                         ptr += pwd->ahi.channels;
1023                 }
1024                 /* prepare for next block */
1025                 memmove(&pwd->frame_out[ch][0], &pwd->frame_out[ch][pwd->frame_len],
1026                         pwd->frame_len * sizeof(float));
1027         }
1028         return 0;
1029 }
1030
1031 static int wma_decode_superframe(struct private_wmadec_data *pwd, void *out,
1032                 int *out_size, const uint8_t *in)
1033 {
1034         int ret, in_size = pwd->ahi.packet_size - WMA_FRAME_SKIP;
1035         int16_t *samples = out;
1036
1037         init_get_bits(&pwd->gb, in, in_size);
1038         if (pwd->ahi.use_bit_reservoir) {
1039                 int i, nb_frames, bit_offset, pos, len;
1040                 uint8_t *q;
1041
1042                 /* read super frame header */
1043                 skip_bits(&pwd->gb, 4); /* super frame index */
1044                 nb_frames = get_bits(&pwd->gb, 4) - 1;
1045                 // PARA_DEBUG_LOG("have %d frames\n", nb_frames);
1046                 ret = -E_WMA_OUTPUT_SPACE;
1047                 if ((nb_frames + 1) * pwd->ahi.channels * pwd->frame_len
1048                                 * sizeof(int16_t) > *out_size)
1049                         goto fail;
1050
1051                 bit_offset = get_bits(&pwd->gb, pwd->byte_offset_bits + 3);
1052
1053                 if (pwd->last_superframe_len > 0) {
1054                         /* add bit_offset bits to last frame */
1055                         ret = -E_WMA_BAD_SUPERFRAME;
1056                         if ((pwd->last_superframe_len + ((bit_offset + 7) >> 3)) >
1057                                         MAX_CODED_SUPERFRAME_SIZE)
1058                                 goto fail;
1059                         q = pwd->last_superframe + pwd->last_superframe_len;
1060                         len = bit_offset;
1061                         while (len > 7) {
1062                                 *q++ = get_bits(&pwd->gb, 8);
1063                                 len -= 8;
1064                         }
1065                         if (len > 0)
1066                                 *q++ = get_bits(&pwd->gb, len) << (8 - len);
1067
1068                         /* XXX: bit_offset bits into last frame */
1069                         init_get_bits(&pwd->gb, pwd->last_superframe,
1070                                 MAX_CODED_SUPERFRAME_SIZE);
1071                         /* skip unused bits */
1072                         if (pwd->last_bitoffset > 0)
1073                                 skip_bits(&pwd->gb, pwd->last_bitoffset);
1074                         /*
1075                          * This frame is stored in the last superframe and in
1076                          * the current one.
1077                          */
1078                         ret = wma_decode_frame(pwd, samples);
1079                         if (ret < 0)
1080                                 goto fail;
1081                         samples += pwd->ahi.channels * pwd->frame_len;
1082                 }
1083
1084                 /* read each frame starting from bit_offset */
1085                 pos = bit_offset + 4 + 4 + pwd->byte_offset_bits + 3;
1086                 init_get_bits(&pwd->gb, in + (pos >> 3),
1087                         (MAX_CODED_SUPERFRAME_SIZE - (pos >> 3)));
1088                 len = pos & 7;
1089                 if (len > 0)
1090                         skip_bits(&pwd->gb, len);
1091
1092                 pwd->reset_block_lengths = true;
1093                 for (i = 0; i < nb_frames; i++) {
1094                         ret = wma_decode_frame(pwd, samples);
1095                         if (ret < 0)
1096                                 goto fail;
1097                         samples += pwd->ahi.channels * pwd->frame_len;
1098                 }
1099
1100                 /* we copy the end of the frame in the last frame buffer */
1101                 pos = get_bits_count(&pwd->gb) +
1102                         ((bit_offset + 4 + 4 + pwd->byte_offset_bits + 3) & ~7);
1103                 pwd->last_bitoffset = pos & 7;
1104                 pos >>= 3;
1105                 len = in_size - pos;
1106                 ret = -E_WMA_BAD_SUPERFRAME;
1107                 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0)
1108                         goto fail;
1109                 pwd->last_superframe_len = len;
1110                 memcpy(pwd->last_superframe, in + pos, len);
1111         } else {
1112                 PARA_DEBUG_LOG("not using bit reservoir\n");
1113                 ret = -E_WMA_OUTPUT_SPACE;
1114                 if (pwd->ahi.channels * pwd->frame_len * sizeof(int16_t) > *out_size)
1115                         goto fail;
1116                 /* single frame decode */
1117                 ret = wma_decode_frame(pwd, samples);
1118                 if (ret < 0)
1119                         goto fail;
1120                 samples += pwd->ahi.channels * pwd->frame_len;
1121         }
1122         PARA_DEBUG_LOG("frame_len: %d, block_len: %d, outbytes: %d, eaten: %d\n",
1123                 pwd->frame_len, pwd->block_len,
1124                 (int)((int8_t *)samples - (int8_t *)out), pwd->ahi.block_align);
1125         *out_size = (int8_t *)samples - (int8_t *)out;
1126         return pwd->ahi.block_align;
1127 fail:
1128         /* reset the bit reservoir on errors */
1129         pwd->last_superframe_len = 0;
1130         return ret;
1131 }
1132
1133 static void wmadec_close(struct filter_node *fn)
1134 {
1135         struct private_wmadec_data *pwd = fn->private_data;
1136         int i;
1137
1138         if (!pwd)
1139                 return;
1140         for (i = 0; i < pwd->nb_block_sizes; i++)
1141                 imdct_end(pwd->mdct_ctx[i]);
1142         if (pwd->ahi.use_exp_vlc)
1143                 free_vlc(&pwd->exp_vlc);
1144         if (pwd->use_noise_coding)
1145                 free_vlc(&pwd->hgain_vlc);
1146         for (i = 0; i < 2; i++) {
1147                 free_vlc(&pwd->coef_vlc[i]);
1148                 free(pwd->run_table[i]);
1149                 free(pwd->level_table[i]);
1150         }
1151         free(fn->private_data);
1152         fn->private_data = NULL;
1153 }
1154
1155 static int wmadec_execute(struct btr_node *btrn, const char *cmd, char **result)
1156 {
1157         struct filter_node *fn = btr_context(btrn);
1158         struct private_wmadec_data *pwd = fn->private_data;
1159
1160         return decoder_execute(cmd, pwd->ahi.sample_rate, pwd->ahi.channels,
1161                 result);
1162 }
1163
1164 #define WMA_OUTPUT_BUFFER_SIZE (128 * 1024)
1165
1166 static int wmadec_post_select(__a_unused struct sched *s, void *context)
1167 {
1168         struct filter_node *fn = context;
1169         int ret, converted, out_size;
1170         struct private_wmadec_data *pwd = fn->private_data;
1171         struct btr_node *btrn = fn->btrn;
1172         size_t len;
1173         char *in, *out;
1174
1175 next_buffer:
1176         converted = 0;
1177         ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
1178         if (ret < 0)
1179                 goto err;
1180         if (ret == 0)
1181                 return 0;
1182         btr_merge(btrn, fn->min_iqs);
1183         len = btr_next_buffer(btrn, &in);
1184         ret = -E_WMADEC_EOF;
1185         if (len < fn->min_iqs)
1186                 goto err;
1187         if (!pwd) {
1188                 ret = wma_decode_init(in, len, &pwd);
1189                 if (ret < 0)
1190                         goto err;
1191                 if (ret == 0) {
1192                         fn->min_iqs += 4096;
1193                         goto next_buffer;
1194                 }
1195                 fn->min_iqs = 2 * pwd->ahi.packet_size;
1196                 fn->private_data = pwd;
1197                 converted = pwd->ahi.header_len;
1198                 goto success;
1199         }
1200         fn->min_iqs = pwd->ahi.packet_size;
1201         if (fn->min_iqs > len)
1202                 goto success;
1203         out_size = WMA_OUTPUT_BUFFER_SIZE;
1204         out = para_malloc(out_size);
1205         ret = wma_decode_superframe(pwd, out, &out_size,
1206                 (uint8_t *)in + WMA_FRAME_SKIP);
1207         if (ret < 0) {
1208                 free(out);
1209                 goto err;
1210         }
1211         if (out_size > 0) {
1212                 out = para_realloc(out, out_size);
1213                 btr_add_output(out, out_size, btrn);
1214         } else
1215                 free(out);
1216         converted += pwd->ahi.packet_size;
1217 success:
1218         btr_consume(btrn, converted);
1219         return 0;
1220 err:
1221         assert(ret < 0);
1222         btr_remove_node(&fn->btrn);
1223         return ret;
1224 }
1225
1226 static void wmadec_open(struct filter_node *fn)
1227 {
1228         fn->private_data = NULL;
1229         fn->min_iqs = 4096;
1230 }
1231
1232 const struct filter lsg_filter_cmd_com_wmadec_user_data = {
1233         .open = wmadec_open,
1234         .close = wmadec_close,
1235         .execute = wmadec_execute,
1236         .pre_select = generic_filter_pre_select,
1237         .post_select = wmadec_post_select,
1238 };