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 "bitstream.h"
  32 #include "imdct.h"
  33 #include "wma.h"
  34 #include "wmadata.h"
  35
  36
  37 /* size of blocks */
  38 #define BLOCK_MIN_BITS 7
  39 #define BLOCK_MAX_BITS 11
  40 #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
  41
  42 #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
  43
  44 /* XXX: find exact max size */
  45 #define HIGH_BAND_MAX_SIZE 16
  46
  47 /* XXX: is it a suitable value ? */
  48 #define MAX_CODED_SUPERFRAME_SIZE 16384
  49
  50 #define MAX_CHANNELS 2
  51
  52 #define NOISE_TAB_SIZE 8192
  53
  54 #define LSP_POW_BITS 7
  55
  56 struct private_wmadec_data {
  57         /** Information contained in the audio file header. */
  58         struct asf_header_info ahi;
  59         struct getbit_context gb;
  60         /** Whether perceptual noise is added. */
  61         int use_noise_coding;
  62         /** Depends on number of the bits per second and the frame length. */
  63         int byte_offset_bits;
  64         /** Only used if ahi->use_exp_vlc is true. */
  65         struct vlc exp_vlc;
  66         uint16_t exponent_bands[BLOCK_NB_SIZES][25];
  67         /** The index of the first coef in high band. */
  68         int high_band_start[BLOCK_NB_SIZES];
  69         /** Maximal number of coded coefficients. */
  70         int coefs_end[BLOCK_NB_SIZES];
  71         int exponent_high_sizes[BLOCK_NB_SIZES];
  72         int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
  73         struct vlc hgain_vlc;
  74
  75         /* coded values in high bands */
  76         int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
  77         int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
  78
  79         /* there are two possible tables for spectral coefficients */
  80         struct vlc coef_vlc[2];
  81         uint16_t *run_table[2];
  82         uint16_t *level_table[2];
  83         const struct coef_vlc_table *coef_vlcs[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 wmadec_cleanup(struct private_wmadec_data *pwd)
 162 {
 163         int i;
 164
 165         for (i = 0; i < pwd->nb_block_sizes; i++)
 166                 imdct_end(pwd->mdct_ctx[i]);
 167         if (pwd->ahi.use_exp_vlc)
 168                 free_vlc(&pwd->exp_vlc);
 169         if (pwd->use_noise_coding)
 170                 free_vlc(&pwd->hgain_vlc);
 171         for (i = 0; i < 2; i++) {
 172                 free_vlc(&pwd->coef_vlc[i]);
 173                 free(pwd->run_table[i]);
 174                 free(pwd->level_table[i]);
 175         }
 176 }
 177
 178 static void init_coef_vlc(struct vlc *vlc, uint16_t **prun_table,
 179                 uint16_t **plevel_table, const struct coef_vlc_table *vlc_table)
 180 {
 181         int n = vlc_table->n;
 182         const uint8_t *table_bits = vlc_table->huffbits;
 183         const uint32_t *table_codes = vlc_table->huffcodes;
 184         const uint16_t *levels_table = vlc_table->levels;
 185         uint16_t *run_table, *level_table;
 186         int i, l, j, k, level;
 187
 188         init_vlc(vlc, VLCBITS, n, table_bits, table_codes, 4);
 189
 190         run_table = para_malloc(n * sizeof(uint16_t));
 191         level_table = para_malloc(n * sizeof(uint16_t));
 192         i = 2;
 193         level = 1;
 194         k = 0;
 195         while (i < n) {
 196                 l = levels_table[k++];
 197                 for (j = 0; j < l; j++) {
 198                         run_table[i] = j;
 199                         level_table[i] = level;
 200                         i++;
 201                 }
 202                 level++;
 203         }
 204         *prun_table = run_table;
 205         *plevel_table = level_table;
 206 }
 207
 208 /* compute the scale factor band sizes for each MDCT block size */
 209 static void compute_scale_factor_band_sizes(struct private_wmadec_data *pwd,
 210         float high_freq)
 211 {
 212         struct asf_header_info *ahi = &pwd->ahi;
 213         int a, b, pos, lpos, k, block_len, i, j, n;
 214         const uint8_t *table;
 215
 216         for (k = 0; k < pwd->nb_block_sizes; k++) {
 217                 int exponent_size;
 218
 219                 block_len = pwd->frame_len >> k;
 220                 table = NULL;
 221                 a = pwd->frame_len_bits - BLOCK_MIN_BITS - k;
 222                 if (a < 3) {
 223                         if (ahi->sample_rate >= 44100)
 224                                 table = exponent_band_44100[a];
 225                         else if (ahi->sample_rate >= 32000)
 226                                 table = exponent_band_32000[a];
 227                         else if (ahi->sample_rate >= 22050)
 228                                 table = exponent_band_22050[a];
 229                 }
 230                 if (table) {
 231                         n = *table++;
 232                         for (i = 0; i < n; i++)
 233                                 pwd->exponent_bands[k][i] = table[i];
 234                         exponent_size = n;
 235                 } else {
 236                         j = 0;
 237                         lpos = 0;
 238                         for (i = 0; i < 25; i++) {
 239                                 a = wma_critical_freqs[i];
 240                                 b = ahi->sample_rate;
 241                                 pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
 242                                 pos <<= 2;
 243                                 if (pos > block_len)
 244                                         pos = block_len;
 245                                 if (pos > lpos)
 246                                         pwd->exponent_bands[k][j++] = pos - lpos;
 247                                 if (pos >= block_len)
 248                                         break;
 249                                 lpos = pos;
 250                         }
 251                         exponent_size = j;
 252                 }
 253
 254                 /* max number of coefs */
 255                 pwd->coefs_end[k] = (pwd->frame_len - ((pwd->frame_len * 9) / 100)) >> k;
 256                 /* high freq computation */
 257                 pwd->high_band_start[k] = (int) ((block_len * 2 * high_freq)
 258                         / ahi->sample_rate + 0.5);
 259                 n = exponent_size;
 260                 j = 0;
 261                 pos = 0;
 262                 for (i = 0; i < n; i++) {
 263                         int start, end;
 264                         start = pos;
 265                         pos += pwd->exponent_bands[k][i];
 266                         end = pos;
 267                         if (start < pwd->high_band_start[k])
 268                                 start = pwd->high_band_start[k];
 269                         if (end > pwd->coefs_end[k])
 270                                 end = pwd->coefs_end[k];
 271                         if (end > start)
 272                                 pwd->exponent_high_bands[k][j++] = end - start;
 273                 }
 274                 pwd->exponent_high_sizes[k] = j;
 275         }
 276 }
 277
 278 static int wma_init(struct private_wmadec_data *pwd)
 279 {
 280         int i;
 281         float bps1, high_freq;
 282         volatile float bps;
 283         int sample_rate1;
 284         int coef_vlc_table;
 285         struct asf_header_info *ahi = &pwd->ahi;
 286         int flags2 = ahi->flags2;
 287
 288         if (ahi->sample_rate <= 0 || ahi->sample_rate > 50000
 289                 || ahi->channels <= 0 || ahi->channels > 8
 290                 || ahi->bit_rate <= 0)
 291                 return -E_WMA_BAD_PARAMS;
 292
 293         /* compute MDCT block size */
 294         if (ahi->sample_rate <= 16000)
 295                 pwd->frame_len_bits = 9;
 296         else if (ahi->sample_rate <= 22050)
 297                 pwd->frame_len_bits = 10;
 298         else
 299                 pwd->frame_len_bits = 11;
 300         pwd->frame_len = 1 << pwd->frame_len_bits;
 301         if (pwd->ahi.use_variable_block_len) {
 302                 int nb_max, nb;
 303                 nb = ((flags2 >> 3) & 3) + 1;
 304                 if ((ahi->bit_rate / ahi->channels) >= 32000)
 305                         nb += 2;
 306                 nb_max = pwd->frame_len_bits - BLOCK_MIN_BITS;
 307                 if (nb > nb_max)
 308                         nb = nb_max;
 309                 pwd->nb_block_sizes = nb + 1;
 310         } else
 311                 pwd->nb_block_sizes = 1;
 312
 313         /* init rate dependent parameters */
 314         pwd->use_noise_coding = 1;
 315         high_freq = ahi->sample_rate * 0.5;
 316
 317         /* wma2 rates are normalized */
 318         sample_rate1 = ahi->sample_rate;
 319         if (sample_rate1 >= 44100)
 320                 sample_rate1 = 44100;
 321         else if (sample_rate1 >= 22050)
 322                 sample_rate1 = 22050;
 323         else if (sample_rate1 >= 16000)
 324                 sample_rate1 = 16000;
 325         else if (sample_rate1 >= 11025)
 326                 sample_rate1 = 11025;
 327         else if (sample_rate1 >= 8000)
 328                 sample_rate1 = 8000;
 329
 330         bps = (float) ahi->bit_rate / (float) (ahi->channels * ahi->sample_rate);
 331         pwd->byte_offset_bits = wma_log2((int) (bps * pwd->frame_len / 8.0 + 0.5)) + 2;
 332         /*
 333          * Compute high frequency value and choose if noise coding should be
 334          * activated.
 335          */
 336         bps1 = bps;
 337         if (ahi->channels == 2)
 338                 bps1 = bps * 1.6;
 339         if (sample_rate1 == 44100) {
 340                 if (bps1 >= 0.61)
 341                         pwd->use_noise_coding = 0;
 342                 else
 343                         high_freq = high_freq * 0.4;
 344         } else if (sample_rate1 == 22050) {
 345                 if (bps1 >= 1.16)
 346                         pwd->use_noise_coding = 0;
 347                 else if (bps1 >= 0.72)
 348                         high_freq = high_freq * 0.7;
 349                 else
 350                         high_freq = high_freq * 0.6;
 351         } else if (sample_rate1 == 16000) {
 352                 if (bps > 0.5)
 353                         high_freq = high_freq * 0.5;
 354                 else
 355                         high_freq = high_freq * 0.3;
 356         } else if (sample_rate1 == 11025)
 357                 high_freq = high_freq * 0.7;
 358         else if (sample_rate1 == 8000) {
 359                 if (bps <= 0.625)
 360                         high_freq = high_freq * 0.5;
 361                 else if (bps > 0.75)
 362                         pwd->use_noise_coding = 0;
 363                 else
 364                         high_freq = high_freq * 0.65;
 365         } else {
 366                 if (bps >= 0.8)
 367                         high_freq = high_freq * 0.75;
 368                 else if (bps >= 0.6)
 369                         high_freq = high_freq * 0.6;
 370                 else
 371                         high_freq = high_freq * 0.5;
 372         }
 373         PARA_INFO_LOG("channels=%u sample_rate=%u "
 374                 "bitrate=%u block_align=%d\n",
 375                 ahi->channels, ahi->sample_rate,
 376                 ahi->bit_rate, ahi->block_align);
 377         PARA_INFO_LOG("frame_len=%d, bps=%f bps1=%f "
 378                 "high_freq=%f bitoffset=%d\n",
 379                 pwd->frame_len, bps, bps1,
 380                 high_freq, pwd->byte_offset_bits);
 381         PARA_INFO_LOG("use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
 382                 pwd->use_noise_coding, pwd->ahi.use_exp_vlc, pwd->nb_block_sizes);
 383
 384         compute_scale_factor_band_sizes(pwd, high_freq);
 385         /* init MDCT windows : simple sinus window */
 386         for (i = 0; i < pwd->nb_block_sizes; i++) {
 387                 int n;
 388                 n = 1 << (pwd->frame_len_bits - i);
 389                 sine_window_init(sine_windows[pwd->frame_len_bits - i - 7], n);
 390                 pwd->windows[i] = sine_windows[pwd->frame_len_bits - i - 7];
 391         }
 392
 393         pwd->reset_block_lengths = true;
 394
 395         if (pwd->use_noise_coding) {
 396                 /* init the noise generator */
 397                 if (pwd->ahi.use_exp_vlc)
 398                         pwd->noise_mult = 0.02;
 399                 else
 400                         pwd->noise_mult = 0.04;
 401
 402                 {
 403                         unsigned int seed;
 404                         float norm;
 405                         seed = 1;
 406                         norm = (1.0 / (float) (1LL << 31)) * sqrt(3) * pwd->noise_mult;
 407                         for (i = 0; i < NOISE_TAB_SIZE; i++) {
 408                                 seed = seed * 314159 + 1;
 409                                 pwd->noise_table[i] = (float) ((int) seed) * norm;
 410                         }
 411                 }
 412         }
 413
 414         /* choose the VLC tables for the coefficients */
 415         coef_vlc_table = 2;
 416         if (ahi->sample_rate >= 32000) {
 417                 if (bps1 < 0.72)
 418                         coef_vlc_table = 0;
 419                 else if (bps1 < 1.16)
 420                         coef_vlc_table = 1;
 421         }
 422         pwd->coef_vlcs[0] = &coef_vlcs[coef_vlc_table * 2];
 423         pwd->coef_vlcs[1] = &coef_vlcs[coef_vlc_table * 2 + 1];
 424         init_coef_vlc(&pwd->coef_vlc[0], &pwd->run_table[0], &pwd->level_table[0],
 425                 pwd->coef_vlcs[0]);
 426         init_coef_vlc(&pwd->coef_vlc[1], &pwd->run_table[1], &pwd->level_table[1],
 427                 pwd->coef_vlcs[1]);
 428         return 0;
 429 }
 430
 431 static void wma_lsp_to_curve_init(struct private_wmadec_data *pwd)
 432 {
 433         float wdel, a, b;
 434         int i, e, m;
 435
 436         wdel = M_PI / pwd->frame_len;
 437         for (i = 0; i < pwd->frame_len; i++)
 438                 pwd->lsp_cos_table[i] = 2.0f * cos(wdel * i);
 439
 440         /* tables for x^-0.25 computation */
 441         for (i = 0; i < 256; i++) {
 442                 e = i - 126;
 443                 pwd->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
 444         }
 445
 446         /* These two tables are needed to avoid two operations in pow_m1_4. */
 447         b = 1.0;
 448         for (i = (1 << LSP_POW_BITS) - 1; i >= 0; i--) {
 449                 m = (1 << LSP_POW_BITS) + i;
 450                 a = (float) m *(0.5 / (1 << LSP_POW_BITS));
 451                 a = pow(a, -0.25);
 452                 pwd->lsp_pow_m_table1[i] = 2 * a - b;
 453                 pwd->lsp_pow_m_table2[i] = b - a;
 454                 b = a;
 455         }
 456 }
 457
 458 static int wma_decode_init(char *initial_buf, int len, struct private_wmadec_data **result)
 459 {
 460         struct private_wmadec_data *pwd;
 461         int ret, i;
 462
 463         PARA_NOTICE_LOG("initial buf: %d bytes\n", len);
 464         pwd = para_calloc(sizeof(*pwd));
 465         ret = read_asf_header(initial_buf, len, &pwd->ahi);
 466         if (ret <= 0) {
 467                 free(pwd);
 468                 return ret;
 469         }
 470
 471         ret = wma_init(pwd);
 472         if (ret < 0)
 473                 return ret;
 474         /* init MDCT */
 475         for (i = 0; i < pwd->nb_block_sizes; i++) {
 476                 ret = imdct_init(pwd->frame_len_bits - i + 1, &pwd->mdct_ctx[i]);
 477                 if (ret < 0)
 478                         return ret;
 479         }
 480         if (pwd->use_noise_coding) {
 481                 PARA_INFO_LOG("using noise coding\n");
 482                 init_vlc(&pwd->hgain_vlc, HGAINVLCBITS,
 483                         sizeof(wma_hgain_huffbits), wma_hgain_huffbits,
 484                         wma_hgain_huffcodes, 2);
 485         }
 486
 487         if (pwd->ahi.use_exp_vlc) {
 488                 PARA_INFO_LOG("using exp_vlc\n");
 489                 init_vlc(&pwd->exp_vlc, EXPVLCBITS, sizeof(wma_scale_huffbits),
 490                         wma_scale_huffbits, wma_scale_huffcodes, 4);
 491         } else {
 492                 PARA_INFO_LOG("using curve\n");
 493                 wma_lsp_to_curve_init(pwd);
 494         }
 495         *result = pwd;
 496         return pwd->ahi.header_len;
 497 }
 498
 499 /**
 500  * compute x^-0.25 with an exponent and mantissa table. We use linear
 501  * interpolation to reduce the mantissa table size at a small speed
 502  * expense (linear interpolation approximately doubles the number of
 503  * bits of precision).
 504  */
 505 static inline float pow_m1_4(struct private_wmadec_data *pwd, float x)
 506 {
 507         union {
 508                 float f;
 509                 unsigned int v;
 510         } u, t;
 511         unsigned int e, m;
 512         float a, b;
 513
 514         u.f = x;
 515         e = u.v >> 23;
 516         m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
 517         /* build interpolation scale: 1 <= t < 2. */
 518         t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
 519         a = pwd->lsp_pow_m_table1[m];
 520         b = pwd->lsp_pow_m_table2[m];
 521         return pwd->lsp_pow_e_table[e] * (a + b * t.f);
 522 }
 523
 524 static void wma_lsp_to_curve(struct private_wmadec_data *pwd,
 525                 float *out, float *val_max_ptr, int n, float *lsp)
 526 {
 527         int i, j;
 528         float p, q, w, v, val_max;
 529
 530         val_max = 0;
 531         for (i = 0; i < n; i++) {
 532                 p = 0.5f;
 533                 q = 0.5f;
 534                 w = pwd->lsp_cos_table[i];
 535                 for (j = 1; j < NB_LSP_COEFS; j += 2) {
 536                         q *= w - lsp[j - 1];
 537                         p *= w - lsp[j];
 538                 }
 539                 p *= p * (2.0f - w);
 540                 q *= q * (2.0f + w);
 541                 v = p + q;
 542                 v = pow_m1_4(pwd, v);
 543                 if (v > val_max)
 544                         val_max = v;
 545                 out[i] = v;
 546         }
 547         *val_max_ptr = val_max;
 548 }
 549
 550 /* Decode exponents coded with LSP coefficients (same idea as Vorbis). */
 551 static void decode_exp_lsp(struct private_wmadec_data *pwd, int ch)
 552 {
 553         float lsp_coefs[NB_LSP_COEFS];
 554         int val, i;
 555
 556         for (i = 0; i < NB_LSP_COEFS; i++) {
 557                 if (i == 0 || i >= 8)
 558                         val = get_bits(&pwd->gb, 3);
 559                 else
 560                         val = get_bits(&pwd->gb, 4);
 561                 lsp_coefs[i] = wma_lsp_codebook[i][val];
 562         }
 563
 564         wma_lsp_to_curve(pwd, pwd->exponents[ch], &pwd->max_exponent[ch],
 565                 pwd->block_len, lsp_coefs);
 566 }
 567
 568 /* Decode exponents coded with VLC codes. */
 569 static int decode_exp_vlc(struct private_wmadec_data *pwd, int ch)
 570 {
 571         int last_exp, n, code;
 572         const uint16_t *ptr, *band_ptr;
 573         float v, *q, max_scale, *q_end;
 574
 575         band_ptr = pwd->exponent_bands[pwd->frame_len_bits - pwd->block_len_bits];
 576         ptr = band_ptr;
 577         q = pwd->exponents[ch];
 578         q_end = q + pwd->block_len;
 579         max_scale = 0;
 580         last_exp = 36;
 581
 582         while (q < q_end) {
 583                 code = get_vlc(&pwd->gb, pwd->exp_vlc.table, EXPVLCBITS);
 584                 if (code < 0)
 585                         return code;
 586                 /* NOTE: this offset is the same as MPEG4 AAC ! */
 587                 last_exp += code - 60;
 588                 /* XXX: use a table */
 589                 v = pow(10, last_exp * (1.0 / 16.0));
 590                 if (v > max_scale)
 591                         max_scale = v;
 592                 n = *ptr++;
 593                 do {
 594                         *q++ = v;
 595                 } while (--n);
 596         }
 597         pwd->max_exponent[ch] = max_scale;
 598         return 0;
 599 }
 600
 601 /* compute src0 * src1 + src2 */
 602 static inline void vector_mult_add(float *dst, const float *src0, const float *src1,
 603                 const float *src2, int len)
 604 {
 605         int i;
 606
 607         for (i = 0; i < len; i++)
 608                 dst[i] = src0[i] * src1[i] + src2[i];
 609 }
 610
 611 static inline void vector_mult_reverse(float *dst, const float *src0,
 612                 const float *src1, int len)
 613 {
 614         int i;
 615
 616         src1 += len - 1;
 617         for (i = 0; i < len; i++)
 618                 dst[i] = src0[i] * src1[-i];
 619 }
 620
 621 /**
 622  * Apply MDCT window and add into output.
 623  *
 624  * We ensure that when the windows overlap their squared sum
 625  * is always 1 (MDCT reconstruction rule).
 626  */
 627 static void wma_window(struct private_wmadec_data *pwd, float *out)
 628 {
 629         float *in = pwd->output;
 630         int block_len, bsize, n;
 631
 632         /* left part */
 633         if (pwd->block_len_bits <= pwd->prev_block_len_bits) {
 634                 block_len = pwd->block_len;
 635                 bsize = pwd->frame_len_bits - pwd->block_len_bits;
 636                 vector_mult_add(out, in, pwd->windows[bsize], out, block_len);
 637         } else {
 638                 block_len = 1 << pwd->prev_block_len_bits;
 639                 n = (pwd->block_len - block_len) / 2;
 640                 bsize = pwd->frame_len_bits - pwd->prev_block_len_bits;
 641                 vector_mult_add(out + n, in + n, pwd->windows[bsize], out + n,
 642                         block_len);
 643                 memcpy(out + n + block_len, in + n + block_len,
 644                         n * sizeof(float));
 645         }
 646         out += pwd->block_len;
 647         in += pwd->block_len;
 648         /* right part */
 649         if (pwd->block_len_bits <= pwd->next_block_len_bits) {
 650                 block_len = pwd->block_len;
 651                 bsize = pwd->frame_len_bits - pwd->block_len_bits;
 652                 vector_mult_reverse(out, in, pwd->windows[bsize], block_len);
 653         } else {
 654                 block_len = 1 << pwd->next_block_len_bits;
 655                 n = (pwd->block_len - block_len) / 2;
 656                 bsize = pwd->frame_len_bits - pwd->next_block_len_bits;
 657                 memcpy(out, in, n * sizeof(float));
 658                 vector_mult_reverse(out + n, in + n, pwd->windows[bsize],
 659                         block_len);
 660                 memset(out + n + block_len, 0, n * sizeof(float));
 661         }
 662 }
 663
 664 static int wma_total_gain_to_bits(int total_gain)
 665 {
 666         if (total_gain < 15)
 667                 return 13;
 668         else if (total_gain < 32)
 669                 return 12;
 670         else if (total_gain < 40)
 671                 return 11;
 672         else if (total_gain < 45)
 673                 return 10;
 674         else
 675                 return 9;
 676 }
 677
 678 static int compute_high_band_values(struct private_wmadec_data *pwd,
 679                 int bsize, int nb_coefs[MAX_CHANNELS])
 680 {
 681         int ch;
 682
 683         if (!pwd->use_noise_coding)
 684                 return 0;
 685         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 686                 int i, m, a;
 687                 if (!pwd->channel_coded[ch])
 688                         continue;
 689                 m = pwd->exponent_high_sizes[bsize];
 690                 for (i = 0; i < m; i++) {
 691                         a = get_bit(&pwd->gb);
 692                         pwd->high_band_coded[ch][i] = a;
 693                         if (!a)
 694                                 continue;
 695                         nb_coefs[ch] -= pwd->exponent_high_bands[bsize][i];
 696                 }
 697         }
 698         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 699                 int i, n, val;
 700                 if (!pwd->channel_coded[ch])
 701                         continue;
 702                 n = pwd->exponent_high_sizes[bsize];
 703                 val = (int)0x80000000;
 704                 for (i = 0; i < n; i++) {
 705                         if (!pwd->high_band_coded[ch][i])
 706                                 continue;
 707                         if (val == (int)0x80000000)
 708                                 val = get_bits(&pwd->gb, 7) - 19;
 709                         else {
 710                                 int code = get_vlc(&pwd->gb,
 711                                         pwd->hgain_vlc.table, HGAINVLCBITS);
 712                                 if (code < 0)
 713                                         return code;
 714                                 val += code - 18;
 715                         }
 716                         pwd->high_band_values[ch][i] = val;
 717                 }
 718         }
 719         return 1;
 720 }
 721
 722 static void compute_mdct_coefficients(struct private_wmadec_data *pwd,
 723                 int bsize, int total_gain, int nb_coefs[MAX_CHANNELS])
 724 {
 725         int ch;
 726         float mdct_norm = 1.0 / (pwd->block_len / 2);
 727
 728         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 729                 int16_t *coefs1;
 730                 float *coefs, *exponents, mult, mult1, noise;
 731                 int i, j, n, n1, last_high_band, esize;
 732                 float exp_power[HIGH_BAND_MAX_SIZE];
 733
 734                 if (!pwd->channel_coded[ch])
 735                         continue;
 736                 coefs1 = pwd->coefs1[ch];
 737                 exponents = pwd->exponents[ch];
 738                 esize = pwd->exponents_bsize[ch];
 739                 mult = pow(10, total_gain * 0.05) / pwd->max_exponent[ch];
 740                 mult *= mdct_norm;
 741                 coefs = pwd->coefs[ch];
 742                 if (!pwd->use_noise_coding) {
 743                         /* XXX: optimize more */
 744                         n = nb_coefs[ch];
 745                         for (i = 0; i < n; i++)
 746                                 *coefs++ = coefs1[i] *
 747                                         exponents[i << bsize >> esize] * mult;
 748                         n = pwd->block_len - pwd->coefs_end[bsize];
 749                         for (i = 0; i < n; i++)
 750                                 *coefs++ = 0.0;
 751                         continue;
 752                 }
 753                 n1 = pwd->exponent_high_sizes[bsize];
 754                 /* compute power of high bands */
 755                 exponents = pwd->exponents[ch] +
 756                         (pwd->high_band_start[bsize] << bsize);
 757                 last_high_band = 0; /* avoid warning */
 758                 for (j = 0; j < n1; j++) {
 759                         n = pwd->exponent_high_bands[
 760                                 pwd->frame_len_bits - pwd->block_len_bits][j];
 761                         if (pwd->high_band_coded[ch][j]) {
 762                                 float e2, val;
 763                                 e2 = 0;
 764                                 for (i = 0; i < n; i++) {
 765                                         val = exponents[i << bsize >> esize];
 766                                         e2 += val * val;
 767                                 }
 768                                 exp_power[j] = e2 / n;
 769                                 last_high_band = j;
 770                         }
 771                         exponents += n << bsize;
 772                 }
 773                 /* main freqs and high freqs */
 774                 exponents = pwd->exponents[ch];
 775                 for (j = -1; j < n1; j++) {
 776                         if (j < 0)
 777                                 n = pwd->high_band_start[bsize];
 778                         else
 779                                 n = pwd->exponent_high_bands[pwd->frame_len_bits
 780                                         - pwd->block_len_bits][j];
 781                         if (j >= 0 && pwd->high_band_coded[ch][j]) {
 782                                 /* use noise with specified power */
 783                                 mult1 = sqrt(exp_power[j]
 784                                         / exp_power[last_high_band]);
 785                                 /* XXX: use a table */
 786                                 mult1 *= pow(10, pwd->high_band_values[ch][j] * 0.05);
 787                                 mult1 /= (pwd->max_exponent[ch] * pwd->noise_mult);
 788                                 mult1 *= mdct_norm;
 789                                 for (i = 0; i < n; i++) {
 790                                         noise = pwd->noise_table[pwd->noise_index];
 791                                         pwd->noise_index = (pwd->noise_index + 1)
 792                                                 & (NOISE_TAB_SIZE - 1);
 793                                         *coefs++ = noise * exponents[
 794                                                 i << bsize >> esize] * mult1;
 795                                 }
 796                                 exponents += n << bsize;
 797                         } else {
 798                                 /* coded values + small noise */
 799                                 for (i = 0; i < n; i++) {
 800                                         noise = pwd->noise_table[pwd->noise_index];
 801                                         pwd->noise_index = (pwd->noise_index + 1)
 802                                                 & (NOISE_TAB_SIZE - 1);
 803                                         *coefs++ = ((*coefs1++) + noise) *
 804                                                 exponents[i << bsize >> esize]
 805                                                 * mult;
 806                                 }
 807                                 exponents += n << bsize;
 808                         }
 809                 }
 810                 /* very high freqs: noise */
 811                 n = pwd->block_len - pwd->coefs_end[bsize];
 812                 mult1 = mult * exponents[(-(1 << bsize)) >> esize];
 813                 for (i = 0; i < n; i++) {
 814                         *coefs++ = pwd->noise_table[pwd->noise_index] * mult1;
 815                         pwd->noise_index = (pwd->noise_index + 1)
 816                                 & (NOISE_TAB_SIZE - 1);
 817                 }
 818         }
 819 }
 820
 821 /**
 822  * Returns 0 if OK, 1 if last block of frame, negative on uncorrectable
 823  * errors.
 824  */
 825 static int wma_decode_block(struct private_wmadec_data *pwd)
 826 {
 827         int ret, n, v, ch, code, bsize;
 828         int coef_nb_bits, total_gain;
 829         int nb_coefs[MAX_CHANNELS];
 830
 831         /* compute current block length */
 832         if (pwd->ahi.use_variable_block_len) {
 833                 n = wma_log2(pwd->nb_block_sizes - 1) + 1;
 834
 835                 if (pwd->reset_block_lengths) {
 836                         pwd->reset_block_lengths = false;
 837                         v = get_bits(&pwd->gb, n);
 838                         if (v >= pwd->nb_block_sizes)
 839                                 return -E_WMA_BLOCK_SIZE;
 840                         pwd->prev_block_len_bits = pwd->frame_len_bits - v;
 841                         v = get_bits(&pwd->gb, n);
 842                         if (v >= pwd->nb_block_sizes)
 843                                 return -E_WMA_BLOCK_SIZE;
 844                         pwd->block_len_bits = pwd->frame_len_bits - v;
 845                 } else {
 846                         /* update block lengths */
 847                         pwd->prev_block_len_bits = pwd->block_len_bits;
 848                         pwd->block_len_bits = pwd->next_block_len_bits;
 849                 }
 850                 v = get_bits(&pwd->gb, n);
 851                 if (v >= pwd->nb_block_sizes)
 852                         return -E_WMA_BLOCK_SIZE;
 853                 pwd->next_block_len_bits = pwd->frame_len_bits - v;
 854         } else {
 855                 /* fixed block len */
 856                 pwd->next_block_len_bits = pwd->frame_len_bits;
 857                 pwd->prev_block_len_bits = pwd->frame_len_bits;
 858                 pwd->block_len_bits = pwd->frame_len_bits;
 859         }
 860
 861         /* now check if the block length is coherent with the frame length */
 862         pwd->block_len = 1 << pwd->block_len_bits;
 863         if ((pwd->block_pos + pwd->block_len) > pwd->frame_len)
 864                 return -E_INCOHERENT_BLOCK_LEN;
 865
 866         if (pwd->ahi.channels == 2)
 867                 pwd->ms_stereo = get_bit(&pwd->gb);
 868         v = 0;
 869         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 870                 int a = get_bit(&pwd->gb);
 871                 pwd->channel_coded[ch] = a;
 872                 v |= a;
 873         }
 874
 875         bsize = pwd->frame_len_bits - pwd->block_len_bits;
 876
 877         /* if no channel coded, no need to go further */
 878         /* XXX: fix potential framing problems */
 879         if (!v)
 880                 goto next;
 881
 882         /*
 883          * Read total gain and extract corresponding number of bits for coef
 884          * escape coding.
 885          */
 886         total_gain = 1;
 887         for (;;) {
 888                 int a = get_bits(&pwd->gb, 7);
 889                 total_gain += a;
 890                 if (a != 127)
 891                         break;
 892         }
 893
 894         coef_nb_bits = wma_total_gain_to_bits(total_gain);
 895
 896         /* compute number of coefficients */
 897         n = pwd->coefs_end[bsize];
 898         for (ch = 0; ch < pwd->ahi.channels; ch++)
 899                 nb_coefs[ch] = n;
 900
 901         ret = compute_high_band_values(pwd, bsize, nb_coefs);
 902         if (ret < 0)
 903                 return ret;
 904
 905         /* exponents can be reused in short blocks. */
 906         if ((pwd->block_len_bits == pwd->frame_len_bits) || get_bit(&pwd->gb)) {
 907                 for (ch = 0; ch < pwd->ahi.channels; ch++) {
 908                         if (pwd->channel_coded[ch]) {
 909                                 if (pwd->ahi.use_exp_vlc) {
 910                                         ret = decode_exp_vlc(pwd, ch);
 911                                         if (ret < 0)
 912                                                 return ret;
 913                                 } else
 914                                         decode_exp_lsp(pwd, ch);
 915                                 pwd->exponents_bsize[ch] = bsize;
 916                         }
 917                 }
 918         }
 919
 920         /* parse spectral coefficients : just RLE encoding */
 921         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 922                 struct vlc *coef_vlc;
 923                 int level, run, tindex;
 924                 int16_t *ptr, *eptr;
 925                 const uint16_t *level_table, *run_table;
 926
 927                 if (!pwd->channel_coded[ch])
 928                         continue;
 929                 /*
 930                  * special VLC tables are used for ms stereo because there is
 931                  * potentially less energy there
 932                  */
 933                 tindex = (ch == 1 && pwd->ms_stereo);
 934                 coef_vlc = &pwd->coef_vlc[tindex];
 935                 run_table = pwd->run_table[tindex];
 936                 level_table = pwd->level_table[tindex];
 937                 /* XXX: optimize */
 938                 ptr = &pwd->coefs1[ch][0];
 939                 eptr = ptr + nb_coefs[ch];
 940                 memset(ptr, 0, pwd->block_len * sizeof(int16_t));
 941                 for (;;) {
 942                         code = get_vlc(&pwd->gb, coef_vlc->table, VLCBITS);
 943                         if (code < 0)
 944                                 return code;
 945                         if (code == 1) /* EOB */
 946                                 break;
 947                         if (code == 0) { /* escape */
 948                                 level = get_bits(&pwd->gb, coef_nb_bits);
 949                                 /* reading block_len_bits would be better */
 950                                 run = get_bits(&pwd->gb, pwd->frame_len_bits);
 951                         } else { /* normal code */
 952                                 run = run_table[code];
 953                                 level = level_table[code];
 954                         }
 955                         if (!get_bit(&pwd->gb))
 956                                 level = -level;
 957                         ptr += run;
 958                         if (ptr >= eptr) {
 959                                 PARA_ERROR_LOG("overflow in spectral RLE, ignoring\n");
 960                                 break;
 961                         }
 962                         *ptr++ = level;
 963                         if (ptr >= eptr) /* EOB can be omitted */
 964                                 break;
 965                 }
 966         }
 967         compute_mdct_coefficients(pwd, bsize, total_gain, nb_coefs);
 968         if (pwd->ms_stereo && pwd->channel_coded[1]) {
 969                 float a, b;
 970                 int i;
 971                 /*
 972                  * Nominal case for ms stereo: we do it before mdct.
 973                  *
 974                  * No need to optimize this case because it should almost never
 975                  * happen.
 976                  */
 977                 if (!pwd->channel_coded[0]) {
 978                         PARA_NOTICE_LOG("rare ms-stereo\n");
 979                         memset(pwd->coefs[0], 0, sizeof(float) * pwd->block_len);
 980                         pwd->channel_coded[0] = 1;
 981                 }
 982                 for (i = 0; i < pwd->block_len; i++) {
 983                         a = pwd->coefs[0][i];
 984                         b = pwd->coefs[1][i];
 985                         pwd->coefs[0][i] = a + b;
 986                         pwd->coefs[1][i] = a - b;
 987                 }
 988         }
 989 next:
 990         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 991                 int n4, idx;
 992
 993                 n4 = pwd->block_len / 2;
 994                 if (pwd->channel_coded[ch])
 995                         imdct(pwd->mdct_ctx[bsize], pwd->output, pwd->coefs[ch]);
 996                 else if (!(pwd->ms_stereo && ch == 1))
 997                         memset(pwd->output, 0, sizeof(pwd->output));
 998
 999                 /* multiply by the window and add in the frame */
1000                 idx = (pwd->frame_len / 2) + pwd->block_pos - n4;
1001                 wma_window(pwd, &pwd->frame_out[ch][idx]);
1002         }
1003
1004         /* update block number */
1005         pwd->block_pos += pwd->block_len;
1006         if (pwd->block_pos >= pwd->frame_len)
1007                 return 1;
1008         else
1009                 return 0;
1010 }
1011
1012 /*
1013  * Clip a signed integer value into the -32768,32767 range.
1014  *
1015  * \param a The value to clip.
1016  *
1017  * \return The clipped value.
1018  */
1019 static inline int16_t av_clip_int16(int a)
1020 {
1021         if ((a + 32768) & ~65535)
1022                 return (a >> 31) ^ 32767;
1023         else
1024                 return a;
1025 }
1026
1027 /* Decode a frame of frame_len samples. */
1028 static int wma_decode_frame(struct private_wmadec_data *pwd, int16_t *samples)
1029 {
1030         int ret, i, ch;
1031         int16_t *ptr;
1032         float *iptr;
1033
1034         /* read each block */
1035         pwd->block_pos = 0;
1036         for (;;) {
1037                 ret = wma_decode_block(pwd);
1038                 if (ret < 0)
1039                         return ret;
1040                 if (ret)
1041                         break;
1042         }
1043
1044         /* convert frame to integer */
1045         for (ch = 0; ch < pwd->ahi.channels; ch++) {
1046                 ptr = samples + ch;
1047                 iptr = pwd->frame_out[ch];
1048
1049                 for (i = 0; i < pwd->frame_len; i++) {
1050                         *ptr = av_clip_int16(lrintf(*iptr++));
1051                         ptr += pwd->ahi.channels;
1052                 }
1053                 /* prepare for next block */
1054                 memmove(&pwd->frame_out[ch][0], &pwd->frame_out[ch][pwd->frame_len],
1055                         pwd->frame_len * sizeof(float));
1056         }
1057         return 0;
1058 }
1059
1060 static int wma_decode_superframe(struct private_wmadec_data *pwd, void *data,
1061                 int *data_size, const uint8_t *buf, int buf_size)
1062 {
1063         int ret;
1064         int16_t *samples;
1065
1066         if (buf_size == 0) {
1067                 pwd->last_superframe_len = 0;
1068                 *data_size = 0;
1069                 return 0;
1070         }
1071         if (buf_size < pwd->ahi.block_align) {
1072                 *data_size = 0;
1073                 return 0;
1074         }
1075         buf_size = pwd->ahi.block_align;
1076         samples = data;
1077         init_get_bits(&pwd->gb, buf, buf_size);
1078         if (pwd->ahi.use_bit_reservoir) {
1079                 int i, nb_frames, bit_offset, pos, len;
1080                 uint8_t *q;
1081
1082                 /* read super frame header */
1083                 skip_bits(&pwd->gb, 4); /* super frame index */
1084                 nb_frames = get_bits(&pwd->gb, 4) - 1;
1085                 // PARA_DEBUG_LOG("have %d frames\n", nb_frames);
1086                 ret = -E_WMA_OUTPUT_SPACE;
1087                 if ((nb_frames + 1) * pwd->ahi.channels * pwd->frame_len
1088                                 * sizeof(int16_t) > *data_size)
1089                         goto fail;
1090
1091                 bit_offset = get_bits(&pwd->gb, pwd->byte_offset_bits + 3);
1092
1093                 if (pwd->last_superframe_len > 0) {
1094                         /* add bit_offset bits to last frame */
1095                         ret = -E_WMA_BAD_SUPERFRAME;
1096                         if ((pwd->last_superframe_len + ((bit_offset + 7) >> 3)) >
1097                                         MAX_CODED_SUPERFRAME_SIZE)
1098                                 goto fail;
1099                         q = pwd->last_superframe + pwd->last_superframe_len;
1100                         len = bit_offset;
1101                         while (len > 7) {
1102                                 *q++ = get_bits(&pwd->gb, 8);
1103                                 len -= 8;
1104                         }
1105                         if (len > 0)
1106                                 *q++ = get_bits(&pwd->gb, len) << (8 - len);
1107
1108                         /* XXX: bit_offset bits into last frame */
1109                         init_get_bits(&pwd->gb, pwd->last_superframe,
1110                                 MAX_CODED_SUPERFRAME_SIZE);
1111                         /* skip unused bits */
1112                         if (pwd->last_bitoffset > 0)
1113                                 skip_bits(&pwd->gb, pwd->last_bitoffset);
1114                         /*
1115                          * This frame is stored in the last superframe and in
1116                          * the current one.
1117                          */
1118                         ret = wma_decode_frame(pwd, samples);
1119                         if (ret < 0)
1120                                 goto fail;
1121                         samples += pwd->ahi.channels * pwd->frame_len;
1122                 }
1123
1124                 /* read each frame starting from bit_offset */
1125                 pos = bit_offset + 4 + 4 + pwd->byte_offset_bits + 3;
1126                 init_get_bits(&pwd->gb, buf + (pos >> 3),
1127                         (MAX_CODED_SUPERFRAME_SIZE - (pos >> 3)));
1128                 len = pos & 7;
1129                 if (len > 0)
1130                         skip_bits(&pwd->gb, len);
1131
1132                 pwd->reset_block_lengths = true;
1133                 for (i = 0; i < nb_frames; i++) {
1134                         ret = wma_decode_frame(pwd, samples);
1135                         if (ret < 0)
1136                                 goto fail;
1137                         samples += pwd->ahi.channels * pwd->frame_len;
1138                 }
1139
1140                 /* we copy the end of the frame in the last frame buffer */
1141                 pos = get_bits_count(&pwd->gb) +
1142                         ((bit_offset + 4 + 4 + pwd->byte_offset_bits + 3) & ~7);
1143                 pwd->last_bitoffset = pos & 7;
1144                 pos >>= 3;
1145                 len = buf_size - pos;
1146                 ret = -E_WMA_BAD_SUPERFRAME;
1147                 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0)
1148                         goto fail;
1149                 pwd->last_superframe_len = len;
1150                 memcpy(pwd->last_superframe, buf + pos, len);
1151         } else {
1152                 PARA_DEBUG_LOG("not using bit reservoir\n");
1153                 ret = -E_WMA_OUTPUT_SPACE;
1154                 if (pwd->ahi.channels * pwd->frame_len * sizeof(int16_t) > *data_size)
1155                         goto fail;
1156                 /* single frame decode */
1157                 ret = wma_decode_frame(pwd, samples);
1158                 if (ret < 0)
1159                         goto fail;
1160                 samples += pwd->ahi.channels * pwd->frame_len;
1161         }
1162         PARA_DEBUG_LOG("frame_len: %d, block_len: %d, outbytes: %d, eaten: %d\n",
1163                 pwd->frame_len, pwd->block_len,
1164                 (int)((int8_t *)samples - (int8_t *)data), pwd->ahi.block_align);
1165         *data_size = (int8_t *)samples - (int8_t *)data;
1166         return pwd->ahi.block_align;
1167 fail:
1168         /* reset the bit reservoir on errors */
1169         pwd->last_superframe_len = 0;
1170         return ret;
1171 }
1172
1173 static void wmadec_close(struct filter_node *fn)
1174 {
1175         struct private_wmadec_data *pwd = fn->private_data;
1176
1177         if (!pwd)
1178                 return;
1179         wmadec_cleanup(pwd);
1180         free(fn->private_data);
1181         fn->private_data = NULL;
1182 }
1183
1184 static int wmadec_execute(struct btr_node *btrn, const char *cmd, char **result)
1185 {
1186         struct filter_node *fn = btr_context(btrn);
1187         struct private_wmadec_data *pwd = fn->private_data;
1188
1189         return decoder_execute(cmd, pwd->ahi.sample_rate, pwd->ahi.channels,
1190                 result);
1191 }
1192
1193 #define WMA_OUTPUT_BUFFER_SIZE (128 * 1024)
1194
1195 static int wmadec_post_select(__a_unused struct sched *s, void *context)
1196 {
1197         struct filter_node *fn = context;
1198         int ret, converted, out_size;
1199         struct private_wmadec_data *pwd = fn->private_data;
1200         struct btr_node *btrn = fn->btrn;
1201         size_t len;
1202         char *in, *out;
1203
1204 next_buffer:
1205         converted = 0;
1206         ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
1207         if (ret < 0)
1208                 goto err;
1209         if (ret == 0)
1210                 return 0;
1211         btr_merge(btrn, fn->min_iqs);
1212         len = btr_next_buffer(btrn, &in);
1213         ret = -E_WMADEC_EOF;
1214         if (len < fn->min_iqs)
1215                 goto err;
1216         if (!pwd) {
1217                 ret = wma_decode_init(in, len, &pwd);
1218                 if (ret < 0)
1219                         goto err;
1220                 if (ret == 0) {
1221                         fn->min_iqs += 4096;
1222                         goto next_buffer;
1223                 }
1224                 fn->min_iqs = 2 * pwd->ahi.packet_size;
1225                 fn->private_data = pwd;
1226                 converted = pwd->ahi.header_len;
1227                 goto success;
1228         }
1229         fn->min_iqs = pwd->ahi.packet_size;
1230         if (fn->min_iqs > len)
1231                 goto success;
1232         out_size = WMA_OUTPUT_BUFFER_SIZE;
1233         out = para_malloc(out_size);
1234         ret = wma_decode_superframe(pwd, out, &out_size,
1235                 (uint8_t *)in + WMA_FRAME_SKIP, len - WMA_FRAME_SKIP);
1236         if (ret < 0) {
1237                 free(out);
1238                 goto err;
1239         }
1240         if (out_size > 0) {
1241                 out = para_realloc(out, out_size);
1242                 btr_add_output(out, out_size, btrn);
1243         } else
1244                 free(out);
1245         converted += pwd->ahi.packet_size;
1246 success:
1247         btr_consume(btrn, converted);
1248         return 0;
1249 err:
1250         assert(ret < 0);
1251         btr_remove_node(&fn->btrn);
1252         return ret;
1253 }
1254
1255 static void wmadec_open(struct filter_node *fn)
1256 {
1257         fn->private_data = NULL;
1258         fn->min_iqs = 4096;
1259 }
1260
1261 const struct filter lsg_filter_cmd_com_wmadec_user_data = {
1262         .open = wmadec_open,
1263         .close = wmadec_close,
1264         .execute = wmadec_execute,
1265         .pre_select = generic_filter_pre_select,
1266         .post_select = wmadec_post_select,
1267 };