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         const struct coef_vlc_table *coef_vlcs[2];
  85         /** Frame length in samples. */
  86         int frame_len;
  87         /** log2 of frame_len. */
  88         int frame_len_bits;
  89         /** Number of block sizes, one if !ahi->use_variable_block_len. */
  90         int nb_block_sizes;
  91         /* Whether to update block lengths from getbit context. */
  92         bool reset_block_lengths;
  93         /** log2 of current block length. */
  94         int block_len_bits;
  95         /** log2 of next block length. */
  96         int next_block_len_bits;
  97         /** log2 of previous block length. */
  98         int prev_block_len_bits;
  99         /** Block length in samples. */
 100         int block_len;
 101         /** Current position in frame. */
 102         int block_pos;
 103         /** True if mid/side stereo mode. */
 104         uint8_t ms_stereo;
 105         /** True if channel is coded. */
 106         uint8_t channel_coded[MAX_CHANNELS];
 107         /** log2 ratio frame/exp. length. */
 108         int exponents_bsize[MAX_CHANNELS];
 109
 110         float exponents[MAX_CHANNELS][BLOCK_MAX_SIZE];
 111         float max_exponent[MAX_CHANNELS];
 112         int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
 113         float coefs[MAX_CHANNELS][BLOCK_MAX_SIZE];
 114         float output[BLOCK_MAX_SIZE * 2];
 115         struct mdct_context *mdct_ctx[BLOCK_NB_SIZES];
 116         float *windows[BLOCK_NB_SIZES];
 117         /** Output buffer for one frame and the last for IMDCT windowing. */
 118         float frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
 119         /** Last frame info. */
 120         uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
 121         int last_bitoffset;
 122         int last_superframe_len;
 123         float noise_table[NOISE_TAB_SIZE];
 124         int noise_index;
 125         float noise_mult;       /* XXX: suppress that and integrate it in the noise array */
 126         /* lsp_to_curve tables */
 127         float lsp_cos_table[BLOCK_MAX_SIZE];
 128         float lsp_pow_e_table[256];
 129         float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
 130         float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
 131 };
 132
 133 #define EXPVLCBITS 8
 134 #define HGAINVLCBITS 9
 135 #define VLCBITS 9
 136
 137 /** \cond sine_winows */
 138
 139 #define SINE_WINDOW(x) static float sine_ ## x[x] __a_aligned(16)
 140
 141 SINE_WINDOW(128);
 142 SINE_WINDOW(256);
 143 SINE_WINDOW(512);
 144 SINE_WINDOW(1024);
 145 SINE_WINDOW(2048);
 146 SINE_WINDOW(4096);
 147
 148 static float *sine_windows[6] = {
 149         sine_128, sine_256, sine_512, sine_1024, sine_2048, sine_4096
 150 };
 151 /** \endcond sine_windows */
 152
 153 /* Generate a sine window. */
 154 static void sine_window_init(float *window, int n)
 155 {
 156         int i;
 157
 158         for (i = 0; i < n; i++)
 159                 window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n)));
 160 }
 161
 162 static void wmadec_cleanup(struct private_wmadec_data *pwd)
 163 {
 164         int i;
 165
 166         for (i = 0; i < pwd->nb_block_sizes; i++)
 167                 imdct_end(pwd->mdct_ctx[i]);
 168         if (pwd->ahi.use_exp_vlc)
 169                 free_vlc(&pwd->exp_vlc);
 170         if (pwd->use_noise_coding)
 171                 free_vlc(&pwd->hgain_vlc);
 172         for (i = 0; i < 2; i++) {
 173                 free_vlc(&pwd->coef_vlc[i]);
 174                 free(pwd->run_table[i]);
 175                 free(pwd->level_table[i]);
 176         }
 177 }
 178
 179 static void init_coef_vlc(struct vlc *vlc, uint16_t **prun_table,
 180                 uint16_t **plevel_table, const struct coef_vlc_table *vlc_table)
 181 {
 182         int n = vlc_table->n;
 183         const uint8_t *table_bits = vlc_table->huffbits;
 184         const uint32_t *table_codes = vlc_table->huffcodes;
 185         const uint16_t *levels_table = vlc_table->levels;
 186         uint16_t *run_table, *level_table;
 187         int i, l, j, k, level;
 188
 189         init_vlc(vlc, VLCBITS, n, table_bits, table_codes, 4);
 190
 191         run_table = para_malloc(n * sizeof(uint16_t));
 192         level_table = para_malloc(n * sizeof(uint16_t));
 193         i = 2;
 194         level = 1;
 195         k = 0;
 196         while (i < n) {
 197                 l = levels_table[k++];
 198                 for (j = 0; j < l; j++) {
 199                         run_table[i] = j;
 200                         level_table[i] = level;
 201                         i++;
 202                 }
 203                 level++;
 204         }
 205         *prun_table = run_table;
 206         *plevel_table = level_table;
 207 }
 208
 209 /* compute the scale factor band sizes for each MDCT block size */
 210 static void compute_scale_factor_band_sizes(struct private_wmadec_data *pwd,
 211         float high_freq)
 212 {
 213         struct asf_header_info *ahi = &pwd->ahi;
 214         int a, b, pos, lpos, k, block_len, i, j, n;
 215         const uint8_t *table;
 216
 217         for (k = 0; k < pwd->nb_block_sizes; k++) {
 218                 int exponent_size;
 219
 220                 block_len = pwd->frame_len >> k;
 221                 table = NULL;
 222                 a = pwd->frame_len_bits - BLOCK_MIN_BITS - k;
 223                 if (a < 3) {
 224                         if (ahi->sample_rate >= 44100)
 225                                 table = exponent_band_44100[a];
 226                         else if (ahi->sample_rate >= 32000)
 227                                 table = exponent_band_32000[a];
 228                         else if (ahi->sample_rate >= 22050)
 229                                 table = exponent_band_22050[a];
 230                 }
 231                 if (table) {
 232                         n = *table++;
 233                         for (i = 0; i < n; i++)
 234                                 pwd->exponent_bands[k][i] = table[i];
 235                         exponent_size = n;
 236                 } else {
 237                         j = 0;
 238                         lpos = 0;
 239                         for (i = 0; i < 25; i++) {
 240                                 a = wma_critical_freqs[i];
 241                                 b = ahi->sample_rate;
 242                                 pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
 243                                 pos <<= 2;
 244                                 if (pos > block_len)
 245                                         pos = block_len;
 246                                 if (pos > lpos)
 247                                         pwd->exponent_bands[k][j++] = pos - lpos;
 248                                 if (pos >= block_len)
 249                                         break;
 250                                 lpos = pos;
 251                         }
 252                         exponent_size = j;
 253                 }
 254
 255                 /* max number of coefs */
 256                 pwd->coefs_end[k] = (pwd->frame_len - ((pwd->frame_len * 9) / 100)) >> k;
 257                 /* high freq computation */
 258                 pwd->high_band_start[k] = (int) ((block_len * 2 * high_freq)
 259                         / ahi->sample_rate + 0.5);
 260                 n = exponent_size;
 261                 j = 0;
 262                 pos = 0;
 263                 for (i = 0; i < n; i++) {
 264                         int start, end;
 265                         start = pos;
 266                         pos += pwd->exponent_bands[k][i];
 267                         end = pos;
 268                         if (start < pwd->high_band_start[k])
 269                                 start = pwd->high_band_start[k];
 270                         if (end > pwd->coefs_end[k])
 271                                 end = pwd->coefs_end[k];
 272                         if (end > start)
 273                                 pwd->exponent_high_bands[k][j++] = end - start;
 274                 }
 275                 pwd->exponent_high_sizes[k] = j;
 276         }
 277 }
 278
 279 static int wma_init(struct private_wmadec_data *pwd)
 280 {
 281         int i;
 282         float bps1, high_freq;
 283         volatile float bps;
 284         int sample_rate1;
 285         int coef_vlc_table;
 286         struct asf_header_info *ahi = &pwd->ahi;
 287         int flags2 = ahi->flags2;
 288
 289         if (ahi->sample_rate <= 0 || ahi->sample_rate > 50000
 290                 || ahi->channels <= 0 || ahi->channels > 8
 291                 || ahi->bit_rate <= 0)
 292                 return -E_WMA_BAD_PARAMS;
 293
 294         /* compute MDCT block size */
 295         if (ahi->sample_rate <= 16000)
 296                 pwd->frame_len_bits = 9;
 297         else if (ahi->sample_rate <= 22050)
 298                 pwd->frame_len_bits = 10;
 299         else
 300                 pwd->frame_len_bits = 11;
 301         pwd->frame_len = 1 << pwd->frame_len_bits;
 302         if (pwd->ahi.use_variable_block_len) {
 303                 int nb_max, nb;
 304                 nb = ((flags2 >> 3) & 3) + 1;
 305                 if ((ahi->bit_rate / ahi->channels) >= 32000)
 306                         nb += 2;
 307                 nb_max = pwd->frame_len_bits - BLOCK_MIN_BITS;
 308                 if (nb > nb_max)
 309                         nb = nb_max;
 310                 pwd->nb_block_sizes = nb + 1;
 311         } else
 312                 pwd->nb_block_sizes = 1;
 313
 314         /* init rate dependent parameters */
 315         pwd->use_noise_coding = 1;
 316         high_freq = ahi->sample_rate * 0.5;
 317
 318         /* wma2 rates are normalized */
 319         sample_rate1 = ahi->sample_rate;
 320         if (sample_rate1 >= 44100)
 321                 sample_rate1 = 44100;
 322         else if (sample_rate1 >= 22050)
 323                 sample_rate1 = 22050;
 324         else if (sample_rate1 >= 16000)
 325                 sample_rate1 = 16000;
 326         else if (sample_rate1 >= 11025)
 327                 sample_rate1 = 11025;
 328         else if (sample_rate1 >= 8000)
 329                 sample_rate1 = 8000;
 330
 331         bps = (float) ahi->bit_rate / (float) (ahi->channels * ahi->sample_rate);
 332         pwd->byte_offset_bits = wma_log2((int) (bps * pwd->frame_len / 8.0 + 0.5)) + 2;
 333         /*
 334          * Compute high frequency value and choose if noise coding should be
 335          * activated.
 336          */
 337         bps1 = bps;
 338         if (ahi->channels == 2)
 339                 bps1 = bps * 1.6;
 340         if (sample_rate1 == 44100) {
 341                 if (bps1 >= 0.61)
 342                         pwd->use_noise_coding = 0;
 343                 else
 344                         high_freq = high_freq * 0.4;
 345         } else if (sample_rate1 == 22050) {
 346                 if (bps1 >= 1.16)
 347                         pwd->use_noise_coding = 0;
 348                 else if (bps1 >= 0.72)
 349                         high_freq = high_freq * 0.7;
 350                 else
 351                         high_freq = high_freq * 0.6;
 352         } else if (sample_rate1 == 16000) {
 353                 if (bps > 0.5)
 354                         high_freq = high_freq * 0.5;
 355                 else
 356                         high_freq = high_freq * 0.3;
 357         } else if (sample_rate1 == 11025)
 358                 high_freq = high_freq * 0.7;
 359         else if (sample_rate1 == 8000) {
 360                 if (bps <= 0.625)
 361                         high_freq = high_freq * 0.5;
 362                 else if (bps > 0.75)
 363                         pwd->use_noise_coding = 0;
 364                 else
 365                         high_freq = high_freq * 0.65;
 366         } else {
 367                 if (bps >= 0.8)
 368                         high_freq = high_freq * 0.75;
 369                 else if (bps >= 0.6)
 370                         high_freq = high_freq * 0.6;
 371                 else
 372                         high_freq = high_freq * 0.5;
 373         }
 374         PARA_INFO_LOG("channels=%u sample_rate=%u "
 375                 "bitrate=%u block_align=%d\n",
 376                 ahi->channels, ahi->sample_rate,
 377                 ahi->bit_rate, ahi->block_align);
 378         PARA_INFO_LOG("frame_len=%d, bps=%f bps1=%f "
 379                 "high_freq=%f bitoffset=%d\n",
 380                 pwd->frame_len, bps, bps1,
 381                 high_freq, pwd->byte_offset_bits);
 382         PARA_INFO_LOG("use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
 383                 pwd->use_noise_coding, pwd->ahi.use_exp_vlc, pwd->nb_block_sizes);
 384
 385         compute_scale_factor_band_sizes(pwd, high_freq);
 386         /* init MDCT windows : simple sinus window */
 387         for (i = 0; i < pwd->nb_block_sizes; i++) {
 388                 int n;
 389                 n = 1 << (pwd->frame_len_bits - i);
 390                 sine_window_init(sine_windows[pwd->frame_len_bits - i - 7], n);
 391                 pwd->windows[i] = sine_windows[pwd->frame_len_bits - i - 7];
 392         }
 393
 394         pwd->reset_block_lengths = true;
 395
 396         if (pwd->use_noise_coding) {
 397                 /* init the noise generator */
 398                 if (pwd->ahi.use_exp_vlc)
 399                         pwd->noise_mult = 0.02;
 400                 else
 401                         pwd->noise_mult = 0.04;
 402
 403                 {
 404                         unsigned int seed;
 405                         float norm;
 406                         seed = 1;
 407                         norm = (1.0 / (float) (1LL << 31)) * sqrt(3) * pwd->noise_mult;
 408                         for (i = 0; i < NOISE_TAB_SIZE; i++) {
 409                                 seed = seed * 314159 + 1;
 410                                 pwd->noise_table[i] = (float) ((int) seed) * norm;
 411                         }
 412                 }
 413         }
 414
 415         /* choose the VLC tables for the coefficients */
 416         coef_vlc_table = 2;
 417         if (ahi->sample_rate >= 32000) {
 418                 if (bps1 < 0.72)
 419                         coef_vlc_table = 0;
 420                 else if (bps1 < 1.16)
 421                         coef_vlc_table = 1;
 422         }
 423         pwd->coef_vlcs[0] = &coef_vlcs[coef_vlc_table * 2];
 424         pwd->coef_vlcs[1] = &coef_vlcs[coef_vlc_table * 2 + 1];
 425         init_coef_vlc(&pwd->coef_vlc[0], &pwd->run_table[0], &pwd->level_table[0],
 426                 pwd->coef_vlcs[0]);
 427         init_coef_vlc(&pwd->coef_vlc[1], &pwd->run_table[1], &pwd->level_table[1],
 428                 pwd->coef_vlcs[1]);
 429         return 0;
 430 }
 431
 432 static void wma_lsp_to_curve_init(struct private_wmadec_data *pwd)
 433 {
 434         float wdel, a, b;
 435         int i, e, m;
 436
 437         wdel = M_PI / pwd->frame_len;
 438         for (i = 0; i < pwd->frame_len; i++)
 439                 pwd->lsp_cos_table[i] = 2.0f * cos(wdel * i);
 440
 441         /* tables for x^-0.25 computation */
 442         for (i = 0; i < 256; i++) {
 443                 e = i - 126;
 444                 pwd->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
 445         }
 446
 447         /* These two tables are needed to avoid two operations in pow_m1_4. */
 448         b = 1.0;
 449         for (i = (1 << LSP_POW_BITS) - 1; i >= 0; i--) {
 450                 m = (1 << LSP_POW_BITS) + i;
 451                 a = (float) m *(0.5 / (1 << LSP_POW_BITS));
 452                 a = pow(a, -0.25);
 453                 pwd->lsp_pow_m_table1[i] = 2 * a - b;
 454                 pwd->lsp_pow_m_table2[i] = b - a;
 455                 b = a;
 456         }
 457 }
 458
 459 static int wma_decode_init(char *initial_buf, int len, struct private_wmadec_data **result)
 460 {
 461         struct private_wmadec_data *pwd;
 462         int ret, i;
 463
 464         PARA_NOTICE_LOG("initial buf: %d bytes\n", len);
 465         pwd = para_calloc(sizeof(*pwd));
 466         ret = read_asf_header(initial_buf, len, &pwd->ahi);
 467         if (ret <= 0) {
 468                 free(pwd);
 469                 return ret;
 470         }
 471
 472         ret = wma_init(pwd);
 473         if (ret < 0)
 474                 return ret;
 475         /* init MDCT */
 476         for (i = 0; i < pwd->nb_block_sizes; i++) {
 477                 ret = imdct_init(pwd->frame_len_bits - i + 1, &pwd->mdct_ctx[i]);
 478                 if (ret < 0)
 479                         return ret;
 480         }
 481         if (pwd->use_noise_coding) {
 482                 PARA_INFO_LOG("using noise coding\n");
 483                 init_vlc(&pwd->hgain_vlc, HGAINVLCBITS,
 484                         sizeof(wma_hgain_huffbits), wma_hgain_huffbits,
 485                         wma_hgain_huffcodes, 2);
 486         }
 487
 488         if (pwd->ahi.use_exp_vlc) {
 489                 PARA_INFO_LOG("using exp_vlc\n");
 490                 init_vlc(&pwd->exp_vlc, EXPVLCBITS, sizeof(wma_scale_huffbits),
 491                         wma_scale_huffbits, wma_scale_huffcodes, 4);
 492         } else {
 493                 PARA_INFO_LOG("using curve\n");
 494                 wma_lsp_to_curve_init(pwd);
 495         }
 496         *result = pwd;
 497         return pwd->ahi.header_len;
 498 }
 499
 500 /**
 501  * compute x^-0.25 with an exponent and mantissa table. We use linear
 502  * interpolation to reduce the mantissa table size at a small speed
 503  * expense (linear interpolation approximately doubles the number of
 504  * bits of precision).
 505  */
 506 static inline float pow_m1_4(struct private_wmadec_data *pwd, float x)
 507 {
 508         union {
 509                 float f;
 510                 unsigned int v;
 511         } u, t;
 512         unsigned int e, m;
 513         float a, b;
 514
 515         u.f = x;
 516         e = u.v >> 23;
 517         m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
 518         /* build interpolation scale: 1 <= t < 2. */
 519         t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
 520         a = pwd->lsp_pow_m_table1[m];
 521         b = pwd->lsp_pow_m_table2[m];
 522         return pwd->lsp_pow_e_table[e] * (a + b * t.f);
 523 }
 524
 525 static void wma_lsp_to_curve(struct private_wmadec_data *pwd,
 526                 float *out, float *val_max_ptr, int n, float *lsp)
 527 {
 528         int i, j;
 529         float p, q, w, v, val_max;
 530
 531         val_max = 0;
 532         for (i = 0; i < n; i++) {
 533                 p = 0.5f;
 534                 q = 0.5f;
 535                 w = pwd->lsp_cos_table[i];
 536                 for (j = 1; j < NB_LSP_COEFS; j += 2) {
 537                         q *= w - lsp[j - 1];
 538                         p *= w - lsp[j];
 539                 }
 540                 p *= p * (2.0f - w);
 541                 q *= q * (2.0f + w);
 542                 v = p + q;
 543                 v = pow_m1_4(pwd, v);
 544                 if (v > val_max)
 545                         val_max = v;
 546                 out[i] = v;
 547         }
 548         *val_max_ptr = val_max;
 549 }
 550
 551 /* Decode exponents coded with LSP coefficients (same idea as Vorbis). */
 552 static void decode_exp_lsp(struct private_wmadec_data *pwd, int ch)
 553 {
 554         float lsp_coefs[NB_LSP_COEFS];
 555         int val, i;
 556
 557         for (i = 0; i < NB_LSP_COEFS; i++) {
 558                 if (i == 0 || i >= 8)
 559                         val = get_bits(&pwd->gb, 3);
 560                 else
 561                         val = get_bits(&pwd->gb, 4);
 562                 lsp_coefs[i] = wma_lsp_codebook[i][val];
 563         }
 564
 565         wma_lsp_to_curve(pwd, pwd->exponents[ch], &pwd->max_exponent[ch],
 566                 pwd->block_len, lsp_coefs);
 567 }
 568
 569 /* Decode exponents coded with VLC codes. */
 570 static int decode_exp_vlc(struct private_wmadec_data *pwd, int ch)
 571 {
 572         int last_exp, n, code;
 573         const uint16_t *ptr, *band_ptr;
 574         float v, *q, max_scale, *q_end;
 575
 576         band_ptr = pwd->exponent_bands[pwd->frame_len_bits - pwd->block_len_bits];
 577         ptr = band_ptr;
 578         q = pwd->exponents[ch];
 579         q_end = q + pwd->block_len;
 580         max_scale = 0;
 581         last_exp = 36;
 582
 583         while (q < q_end) {
 584                 code = get_vlc(&pwd->gb, pwd->exp_vlc.table, EXPVLCBITS);
 585                 if (code < 0)
 586                         return code;
 587                 /* NOTE: this offset is the same as MPEG4 AAC ! */
 588                 last_exp += code - 60;
 589                 /* XXX: use a table */
 590                 v = pow(10, last_exp * (1.0 / 16.0));
 591                 if (v > max_scale)
 592                         max_scale = v;
 593                 n = *ptr++;
 594                 do {
 595                         *q++ = v;
 596                 } while (--n);
 597         }
 598         pwd->max_exponent[ch] = max_scale;
 599         return 0;
 600 }
 601
 602 /* compute src0 * src1 + src2 */
 603 static inline void vector_mult_add(float *dst, const float *src0, const float *src1,
 604                 const float *src2, int len)
 605 {
 606         int i;
 607
 608         for (i = 0; i < len; i++)
 609                 dst[i] = src0[i] * src1[i] + src2[i];
 610 }
 611
 612 static inline void vector_mult_reverse(float *dst, const float *src0,
 613                 const float *src1, int len)
 614 {
 615         int i;
 616
 617         src1 += len - 1;
 618         for (i = 0; i < len; i++)
 619                 dst[i] = src0[i] * src1[-i];
 620 }
 621
 622 /**
 623  * Apply MDCT window and add into output.
 624  *
 625  * We ensure that when the windows overlap their squared sum
 626  * is always 1 (MDCT reconstruction rule).
 627  */
 628 static void wma_window(struct private_wmadec_data *pwd, float *out)
 629 {
 630         float *in = pwd->output;
 631         int block_len, bsize, n;
 632
 633         /* left part */
 634         if (pwd->block_len_bits <= pwd->prev_block_len_bits) {
 635                 block_len = pwd->block_len;
 636                 bsize = pwd->frame_len_bits - pwd->block_len_bits;
 637                 vector_mult_add(out, in, pwd->windows[bsize], out, block_len);
 638         } else {
 639                 block_len = 1 << pwd->prev_block_len_bits;
 640                 n = (pwd->block_len - block_len) / 2;
 641                 bsize = pwd->frame_len_bits - pwd->prev_block_len_bits;
 642                 vector_mult_add(out + n, in + n, pwd->windows[bsize], out + n,
 643                         block_len);
 644                 memcpy(out + n + block_len, in + n + block_len,
 645                         n * sizeof(float));
 646         }
 647         out += pwd->block_len;
 648         in += pwd->block_len;
 649         /* right part */
 650         if (pwd->block_len_bits <= pwd->next_block_len_bits) {
 651                 block_len = pwd->block_len;
 652                 bsize = pwd->frame_len_bits - pwd->block_len_bits;
 653                 vector_mult_reverse(out, in, pwd->windows[bsize], block_len);
 654         } else {
 655                 block_len = 1 << pwd->next_block_len_bits;
 656                 n = (pwd->block_len - block_len) / 2;
 657                 bsize = pwd->frame_len_bits - pwd->next_block_len_bits;
 658                 memcpy(out, in, n * sizeof(float));
 659                 vector_mult_reverse(out + n, in + n, pwd->windows[bsize],
 660                         block_len);
 661                 memset(out + n + block_len, 0, n * sizeof(float));
 662         }
 663 }
 664
 665 static int wma_total_gain_to_bits(int total_gain)
 666 {
 667         if (total_gain < 15)
 668                 return 13;
 669         else if (total_gain < 32)
 670                 return 12;
 671         else if (total_gain < 40)
 672                 return 11;
 673         else if (total_gain < 45)
 674                 return 10;
 675         else
 676                 return 9;
 677 }
 678
 679 static int compute_high_band_values(struct private_wmadec_data *pwd,
 680                 int bsize, int nb_coefs[MAX_CHANNELS])
 681 {
 682         int ch;
 683
 684         if (!pwd->use_noise_coding)
 685                 return 0;
 686         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 687                 int i, m, a;
 688                 if (!pwd->channel_coded[ch])
 689                         continue;
 690                 m = pwd->exponent_high_sizes[bsize];
 691                 for (i = 0; i < m; i++) {
 692                         a = get_bit(&pwd->gb);
 693                         pwd->high_band_coded[ch][i] = a;
 694                         if (!a)
 695                                 continue;
 696                         nb_coefs[ch] -= pwd->exponent_high_bands[bsize][i];
 697                 }
 698         }
 699         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 700                 int i, n, val;
 701                 if (!pwd->channel_coded[ch])
 702                         continue;
 703                 n = pwd->exponent_high_sizes[bsize];
 704                 val = (int)0x80000000;
 705                 for (i = 0; i < n; i++) {
 706                         if (!pwd->high_band_coded[ch][i])
 707                                 continue;
 708                         if (val == (int)0x80000000)
 709                                 val = get_bits(&pwd->gb, 7) - 19;
 710                         else {
 711                                 int code = get_vlc(&pwd->gb,
 712                                         pwd->hgain_vlc.table, HGAINVLCBITS);
 713                                 if (code < 0)
 714                                         return code;
 715                                 val += code - 18;
 716                         }
 717                         pwd->high_band_values[ch][i] = val;
 718                 }
 719         }
 720         return 1;
 721 }
 722
 723 static void compute_mdct_coefficients(struct private_wmadec_data *pwd,
 724                 int bsize, int total_gain, int nb_coefs[MAX_CHANNELS])
 725 {
 726         int ch;
 727         float mdct_norm = 1.0 / (pwd->block_len / 2);
 728
 729         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 730                 int16_t *coefs1;
 731                 float *coefs, *exponents, mult, mult1, noise;
 732                 int i, j, n, n1, last_high_band, esize;
 733                 float exp_power[HIGH_BAND_MAX_SIZE];
 734
 735                 if (!pwd->channel_coded[ch])
 736                         continue;
 737                 coefs1 = pwd->coefs1[ch];
 738                 exponents = pwd->exponents[ch];
 739                 esize = pwd->exponents_bsize[ch];
 740                 mult = pow(10, total_gain * 0.05) / pwd->max_exponent[ch];
 741                 mult *= mdct_norm;
 742                 coefs = pwd->coefs[ch];
 743                 if (!pwd->use_noise_coding) {
 744                         /* XXX: optimize more */
 745                         n = nb_coefs[ch];
 746                         for (i = 0; i < n; i++)
 747                                 *coefs++ = coefs1[i] *
 748                                         exponents[i << bsize >> esize] * mult;
 749                         n = pwd->block_len - pwd->coefs_end[bsize];
 750                         for (i = 0; i < n; i++)
 751                                 *coefs++ = 0.0;
 752                         continue;
 753                 }
 754                 n1 = pwd->exponent_high_sizes[bsize];
 755                 /* compute power of high bands */
 756                 exponents = pwd->exponents[ch] +
 757                         (pwd->high_band_start[bsize] << bsize);
 758                 last_high_band = 0; /* avoid warning */
 759                 for (j = 0; j < n1; j++) {
 760                         n = pwd->exponent_high_bands[
 761                                 pwd->frame_len_bits - pwd->block_len_bits][j];
 762                         if (pwd->high_band_coded[ch][j]) {
 763                                 float e2, val;
 764                                 e2 = 0;
 765                                 for (i = 0; i < n; i++) {
 766                                         val = exponents[i << bsize >> esize];
 767                                         e2 += val * val;
 768                                 }
 769                                 exp_power[j] = e2 / n;
 770                                 last_high_band = j;
 771                         }
 772                         exponents += n << bsize;
 773                 }
 774                 /* main freqs and high freqs */
 775                 exponents = pwd->exponents[ch];
 776                 for (j = -1; j < n1; j++) {
 777                         if (j < 0)
 778                                 n = pwd->high_band_start[bsize];
 779                         else
 780                                 n = pwd->exponent_high_bands[pwd->frame_len_bits
 781                                         - pwd->block_len_bits][j];
 782                         if (j >= 0 && pwd->high_band_coded[ch][j]) {
 783                                 /* use noise with specified power */
 784                                 mult1 = sqrt(exp_power[j]
 785                                         / exp_power[last_high_band]);
 786                                 /* XXX: use a table */
 787                                 mult1 *= pow(10, pwd->high_band_values[ch][j] * 0.05);
 788                                 mult1 /= (pwd->max_exponent[ch] * pwd->noise_mult);
 789                                 mult1 *= mdct_norm;
 790                                 for (i = 0; i < n; i++) {
 791                                         noise = pwd->noise_table[pwd->noise_index];
 792                                         pwd->noise_index = (pwd->noise_index + 1)
 793                                                 & (NOISE_TAB_SIZE - 1);
 794                                         *coefs++ = noise * exponents[
 795                                                 i << bsize >> esize] * mult1;
 796                                 }
 797                                 exponents += n << bsize;
 798                         } else {
 799                                 /* coded values + small noise */
 800                                 for (i = 0; i < n; i++) {
 801                                         noise = pwd->noise_table[pwd->noise_index];
 802                                         pwd->noise_index = (pwd->noise_index + 1)
 803                                                 & (NOISE_TAB_SIZE - 1);
 804                                         *coefs++ = ((*coefs1++) + noise) *
 805                                                 exponents[i << bsize >> esize]
 806                                                 * mult;
 807                                 }
 808                                 exponents += n << bsize;
 809                         }
 810                 }
 811                 /* very high freqs: noise */
 812                 n = pwd->block_len - pwd->coefs_end[bsize];
 813                 mult1 = mult * exponents[(-(1 << bsize)) >> esize];
 814                 for (i = 0; i < n; i++) {
 815                         *coefs++ = pwd->noise_table[pwd->noise_index] * mult1;
 816                         pwd->noise_index = (pwd->noise_index + 1)
 817                                 & (NOISE_TAB_SIZE - 1);
 818                 }
 819         }
 820 }
 821
 822 /**
 823  * Returns 0 if OK, 1 if last block of frame, negative on uncorrectable
 824  * errors.
 825  */
 826 static int wma_decode_block(struct private_wmadec_data *pwd)
 827 {
 828         int ret, n, v, ch, code, bsize;
 829         int coef_nb_bits, total_gain;
 830         int nb_coefs[MAX_CHANNELS];
 831
 832         /* compute current block length */
 833         if (pwd->ahi.use_variable_block_len) {
 834                 n = wma_log2(pwd->nb_block_sizes - 1) + 1;
 835
 836                 if (pwd->reset_block_lengths) {
 837                         pwd->reset_block_lengths = false;
 838                         v = get_bits(&pwd->gb, n);
 839                         if (v >= pwd->nb_block_sizes)
 840                                 return -E_WMA_BLOCK_SIZE;
 841                         pwd->prev_block_len_bits = pwd->frame_len_bits - v;
 842                         v = get_bits(&pwd->gb, n);
 843                         if (v >= pwd->nb_block_sizes)
 844                                 return -E_WMA_BLOCK_SIZE;
 845                         pwd->block_len_bits = pwd->frame_len_bits - v;
 846                 } else {
 847                         /* update block lengths */
 848                         pwd->prev_block_len_bits = pwd->block_len_bits;
 849                         pwd->block_len_bits = pwd->next_block_len_bits;
 850                 }
 851                 v = get_bits(&pwd->gb, n);
 852                 if (v >= pwd->nb_block_sizes)
 853                         return -E_WMA_BLOCK_SIZE;
 854                 pwd->next_block_len_bits = pwd->frame_len_bits - v;
 855         } else {
 856                 /* fixed block len */
 857                 pwd->next_block_len_bits = pwd->frame_len_bits;
 858                 pwd->prev_block_len_bits = pwd->frame_len_bits;
 859                 pwd->block_len_bits = pwd->frame_len_bits;
 860         }
 861
 862         /* now check if the block length is coherent with the frame length */
 863         pwd->block_len = 1 << pwd->block_len_bits;
 864         if ((pwd->block_pos + pwd->block_len) > pwd->frame_len)
 865                 return -E_INCOHERENT_BLOCK_LEN;
 866
 867         if (pwd->ahi.channels == 2)
 868                 pwd->ms_stereo = get_bit(&pwd->gb);
 869         v = 0;
 870         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 871                 int a = get_bit(&pwd->gb);
 872                 pwd->channel_coded[ch] = a;
 873                 v |= a;
 874         }
 875
 876         bsize = pwd->frame_len_bits - pwd->block_len_bits;
 877
 878         /* if no channel coded, no need to go further */
 879         /* XXX: fix potential framing problems */
 880         if (!v)
 881                 goto next;
 882
 883         /*
 884          * Read total gain and extract corresponding number of bits for coef
 885          * escape coding.
 886          */
 887         total_gain = 1;
 888         for (;;) {
 889                 int a = get_bits(&pwd->gb, 7);
 890                 total_gain += a;
 891                 if (a != 127)
 892                         break;
 893         }
 894
 895         coef_nb_bits = wma_total_gain_to_bits(total_gain);
 896
 897         /* compute number of coefficients */
 898         n = pwd->coefs_end[bsize];
 899         for (ch = 0; ch < pwd->ahi.channels; ch++)
 900                 nb_coefs[ch] = n;
 901
 902         ret = compute_high_band_values(pwd, bsize, nb_coefs);
 903         if (ret < 0)
 904                 return ret;
 905
 906         /* exponents can be reused in short blocks. */
 907         if ((pwd->block_len_bits == pwd->frame_len_bits) || get_bit(&pwd->gb)) {
 908                 for (ch = 0; ch < pwd->ahi.channels; ch++) {
 909                         if (pwd->channel_coded[ch]) {
 910                                 if (pwd->ahi.use_exp_vlc) {
 911                                         ret = decode_exp_vlc(pwd, ch);
 912                                         if (ret < 0)
 913                                                 return ret;
 914                                 } else
 915                                         decode_exp_lsp(pwd, ch);
 916                                 pwd->exponents_bsize[ch] = bsize;
 917                         }
 918                 }
 919         }
 920
 921         /* parse spectral coefficients : just RLE encoding */
 922         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 923                 struct vlc *coef_vlc;
 924                 int level, run, tindex;
 925                 int16_t *ptr, *eptr;
 926                 const uint16_t *level_table, *run_table;
 927
 928                 if (!pwd->channel_coded[ch])
 929                         continue;
 930                 /*
 931                  * special VLC tables are used for ms stereo because there is
 932                  * potentially less energy there
 933                  */
 934                 tindex = (ch == 1 && pwd->ms_stereo);
 935                 coef_vlc = &pwd->coef_vlc[tindex];
 936                 run_table = pwd->run_table[tindex];
 937                 level_table = pwd->level_table[tindex];
 938                 /* XXX: optimize */
 939                 ptr = &pwd->coefs1[ch][0];
 940                 eptr = ptr + nb_coefs[ch];
 941                 memset(ptr, 0, pwd->block_len * sizeof(int16_t));
 942                 for (;;) {
 943                         code = get_vlc(&pwd->gb, coef_vlc->table, VLCBITS);
 944                         if (code < 0)
 945                                 return code;
 946                         if (code == 1) /* EOB */
 947                                 break;
 948                         if (code == 0) { /* escape */
 949                                 level = get_bits(&pwd->gb, coef_nb_bits);
 950                                 /* reading block_len_bits would be better */
 951                                 run = get_bits(&pwd->gb, pwd->frame_len_bits);
 952                         } else { /* normal code */
 953                                 run = run_table[code];
 954                                 level = level_table[code];
 955                         }
 956                         if (!get_bit(&pwd->gb))
 957                                 level = -level;
 958                         ptr += run;
 959                         if (ptr >= eptr) {
 960                                 PARA_ERROR_LOG("overflow in spectral RLE, ignoring\n");
 961                                 break;
 962                         }
 963                         *ptr++ = level;
 964                         if (ptr >= eptr) /* EOB can be omitted */
 965                                 break;
 966                 }
 967         }
 968         compute_mdct_coefficients(pwd, bsize, total_gain, nb_coefs);
 969         if (pwd->ms_stereo && pwd->channel_coded[1]) {
 970                 float a, b;
 971                 int i;
 972                 /*
 973                  * Nominal case for ms stereo: we do it before mdct.
 974                  *
 975                  * No need to optimize this case because it should almost never
 976                  * happen.
 977                  */
 978                 if (!pwd->channel_coded[0]) {
 979                         PARA_NOTICE_LOG("rare ms-stereo\n");
 980                         memset(pwd->coefs[0], 0, sizeof(float) * pwd->block_len);
 981                         pwd->channel_coded[0] = 1;
 982                 }
 983                 for (i = 0; i < pwd->block_len; i++) {
 984                         a = pwd->coefs[0][i];
 985                         b = pwd->coefs[1][i];
 986                         pwd->coefs[0][i] = a + b;
 987                         pwd->coefs[1][i] = a - b;
 988                 }
 989         }
 990 next:
 991         for (ch = 0; ch < pwd->ahi.channels; ch++) {
 992                 int n4, idx;
 993
 994                 n4 = pwd->block_len / 2;
 995                 if (pwd->channel_coded[ch])
 996                         imdct(pwd->mdct_ctx[bsize], pwd->output, pwd->coefs[ch]);
 997                 else if (!(pwd->ms_stereo && ch == 1))
 998                         memset(pwd->output, 0, sizeof(pwd->output));
 999
1000                 /* multiply by the window and add in the frame */
1001                 idx = (pwd->frame_len / 2) + pwd->block_pos - n4;
1002                 wma_window(pwd, &pwd->frame_out[ch][idx]);
1003         }
1004
1005         /* update block number */
1006         pwd->block_pos += pwd->block_len;
1007         if (pwd->block_pos >= pwd->frame_len)
1008                 return 1;
1009         else
1010                 return 0;
1011 }
1012
1013 /*
1014  * Clip a signed integer value into the -32768,32767 range.
1015  *
1016  * \param a The value to clip.
1017  *
1018  * \return The clipped value.
1019  */
1020 static inline int16_t av_clip_int16(int a)
1021 {
1022         if ((a + 32768) & ~65535)
1023                 return (a >> 31) ^ 32767;
1024         else
1025                 return a;
1026 }
1027
1028 /* Decode a frame of frame_len samples. */
1029 static int wma_decode_frame(struct private_wmadec_data *pwd, int16_t *samples)
1030 {
1031         int ret, i, ch;
1032         int16_t *ptr;
1033         float *iptr;
1034
1035         /* read each block */
1036         pwd->block_pos = 0;
1037         for (;;) {
1038                 ret = wma_decode_block(pwd);
1039                 if (ret < 0)
1040                         return ret;
1041                 if (ret)
1042                         break;
1043         }
1044
1045         /* convert frame to integer */
1046         for (ch = 0; ch < pwd->ahi.channels; ch++) {
1047                 ptr = samples + ch;
1048                 iptr = pwd->frame_out[ch];
1049
1050                 for (i = 0; i < pwd->frame_len; i++) {
1051                         *ptr = av_clip_int16(lrintf(*iptr++));
1052                         ptr += pwd->ahi.channels;
1053                 }
1054                 /* prepare for next block */
1055                 memmove(&pwd->frame_out[ch][0], &pwd->frame_out[ch][pwd->frame_len],
1056                         pwd->frame_len * sizeof(float));
1057         }
1058         return 0;
1059 }
1060
1061 static int wma_decode_superframe(struct private_wmadec_data *pwd, void *data,
1062                 int *data_size, const uint8_t *buf, int buf_size)
1063 {
1064         int ret;
1065         int16_t *samples;
1066
1067         if (buf_size == 0) {
1068                 pwd->last_superframe_len = 0;
1069                 *data_size = 0;
1070                 return 0;
1071         }
1072         if (buf_size < pwd->ahi.block_align) {
1073                 *data_size = 0;
1074                 return 0;
1075         }
1076         buf_size = pwd->ahi.block_align;
1077         samples = data;
1078         init_get_bits(&pwd->gb, buf, buf_size);
1079         if (pwd->ahi.use_bit_reservoir) {
1080                 int i, nb_frames, bit_offset, pos, len;
1081                 uint8_t *q;
1082
1083                 /* read super frame header */
1084                 skip_bits(&pwd->gb, 4); /* super frame index */
1085                 nb_frames = get_bits(&pwd->gb, 4) - 1;
1086                 // PARA_DEBUG_LOG("have %d frames\n", nb_frames);
1087                 ret = -E_WMA_OUTPUT_SPACE;
1088                 if ((nb_frames + 1) * pwd->ahi.channels * pwd->frame_len
1089                                 * sizeof(int16_t) > *data_size)
1090                         goto fail;
1091
1092                 bit_offset = get_bits(&pwd->gb, pwd->byte_offset_bits + 3);
1093
1094                 if (pwd->last_superframe_len > 0) {
1095                         /* add bit_offset bits to last frame */
1096                         ret = -E_WMA_BAD_SUPERFRAME;
1097                         if ((pwd->last_superframe_len + ((bit_offset + 7) >> 3)) >
1098                                         MAX_CODED_SUPERFRAME_SIZE)
1099                                 goto fail;
1100                         q = pwd->last_superframe + pwd->last_superframe_len;
1101                         len = bit_offset;
1102                         while (len > 7) {
1103                                 *q++ = get_bits(&pwd->gb, 8);
1104                                 len -= 8;
1105                         }
1106                         if (len > 0)
1107                                 *q++ = get_bits(&pwd->gb, len) << (8 - len);
1108
1109                         /* XXX: bit_offset bits into last frame */
1110                         init_get_bits(&pwd->gb, pwd->last_superframe,
1111                                 MAX_CODED_SUPERFRAME_SIZE);
1112                         /* skip unused bits */
1113                         if (pwd->last_bitoffset > 0)
1114                                 skip_bits(&pwd->gb, pwd->last_bitoffset);
1115                         /*
1116                          * This frame is stored in the last superframe and in
1117                          * the current one.
1118                          */
1119                         ret = wma_decode_frame(pwd, samples);
1120                         if (ret < 0)
1121                                 goto fail;
1122                         samples += pwd->ahi.channels * pwd->frame_len;
1123                 }
1124
1125                 /* read each frame starting from bit_offset */
1126                 pos = bit_offset + 4 + 4 + pwd->byte_offset_bits + 3;
1127                 init_get_bits(&pwd->gb, buf + (pos >> 3),
1128                         (MAX_CODED_SUPERFRAME_SIZE - (pos >> 3)));
1129                 len = pos & 7;
1130                 if (len > 0)
1131                         skip_bits(&pwd->gb, len);
1132
1133                 pwd->reset_block_lengths = true;
1134                 for (i = 0; i < nb_frames; i++) {
1135                         ret = wma_decode_frame(pwd, samples);
1136                         if (ret < 0)
1137                                 goto fail;
1138                         samples += pwd->ahi.channels * pwd->frame_len;
1139                 }
1140
1141                 /* we copy the end of the frame in the last frame buffer */
1142                 pos = get_bits_count(&pwd->gb) +
1143                         ((bit_offset + 4 + 4 + pwd->byte_offset_bits + 3) & ~7);
1144                 pwd->last_bitoffset = pos & 7;
1145                 pos >>= 3;
1146                 len = buf_size - pos;
1147                 ret = -E_WMA_BAD_SUPERFRAME;
1148                 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0)
1149                         goto fail;
1150                 pwd->last_superframe_len = len;
1151                 memcpy(pwd->last_superframe, buf + pos, len);
1152         } else {
1153                 PARA_DEBUG_LOG("not using bit reservoir\n");
1154                 ret = -E_WMA_OUTPUT_SPACE;
1155                 if (pwd->ahi.channels * pwd->frame_len * sizeof(int16_t) > *data_size)
1156                         goto fail;
1157                 /* single frame decode */
1158                 ret = wma_decode_frame(pwd, samples);
1159                 if (ret < 0)
1160                         goto fail;
1161                 samples += pwd->ahi.channels * pwd->frame_len;
1162         }
1163         PARA_DEBUG_LOG("frame_len: %d, block_len: %d, outbytes: %d, eaten: %d\n",
1164                 pwd->frame_len, pwd->block_len,
1165                 (int)((int8_t *)samples - (int8_t *)data), pwd->ahi.block_align);
1166         *data_size = (int8_t *)samples - (int8_t *)data;
1167         return pwd->ahi.block_align;
1168 fail:
1169         /* reset the bit reservoir on errors */
1170         pwd->last_superframe_len = 0;
1171         return ret;
1172 }
1173
1174 static void wmadec_close(struct filter_node *fn)
1175 {
1176         struct private_wmadec_data *pwd = fn->private_data;
1177
1178         if (!pwd)
1179                 return;
1180         wmadec_cleanup(pwd);
1181         free(fn->private_data);
1182         fn->private_data = NULL;
1183 }
1184
1185 static int wmadec_execute(struct btr_node *btrn, const char *cmd, char **result)
1186 {
1187         struct filter_node *fn = btr_context(btrn);
1188         struct private_wmadec_data *pwd = fn->private_data;
1189
1190         return decoder_execute(cmd, pwd->ahi.sample_rate, pwd->ahi.channels,
1191                 result);
1192 }
1193
1194 #define WMA_OUTPUT_BUFFER_SIZE (128 * 1024)
1195
1196 static int wmadec_post_select(__a_unused struct sched *s, void *context)
1197 {
1198         struct filter_node *fn = context;
1199         int ret, converted, out_size;
1200         struct private_wmadec_data *pwd = fn->private_data;
1201         struct btr_node *btrn = fn->btrn;
1202         size_t len;
1203         char *in, *out;
1204
1205 next_buffer:
1206         converted = 0;
1207         ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
1208         if (ret < 0)
1209                 goto err;
1210         if (ret == 0)
1211                 return 0;
1212         btr_merge(btrn, fn->min_iqs);
1213         len = btr_next_buffer(btrn, &in);
1214         ret = -E_WMADEC_EOF;
1215         if (len < fn->min_iqs)
1216                 goto err;
1217         if (!pwd) {
1218                 ret = wma_decode_init(in, len, &pwd);
1219                 if (ret < 0)
1220                         goto err;
1221                 if (ret == 0) {
1222                         fn->min_iqs += 4096;
1223                         goto next_buffer;
1224                 }
1225                 fn->min_iqs = 2 * pwd->ahi.packet_size;
1226                 fn->private_data = pwd;
1227                 converted = pwd->ahi.header_len;
1228                 goto success;
1229         }
1230         fn->min_iqs = pwd->ahi.packet_size;
1231         if (fn->min_iqs > len)
1232                 goto success;
1233         out_size = WMA_OUTPUT_BUFFER_SIZE;
1234         out = para_malloc(out_size);
1235         ret = wma_decode_superframe(pwd, out, &out_size,
1236                 (uint8_t *)in + WMA_FRAME_SKIP, len - WMA_FRAME_SKIP);
1237         if (ret < 0) {
1238                 free(out);
1239                 goto err;
1240         }
1241         if (out_size > 0) {
1242                 out = para_realloc(out, out_size);
1243                 btr_add_output(out, out_size, btrn);
1244         } else
1245                 free(out);
1246         converted += pwd->ahi.packet_size;
1247 success:
1248         btr_consume(btrn, converted);
1249         return 0;
1250 err:
1251         assert(ret < 0);
1252         btr_remove_node(&fn->btrn);
1253         return ret;
1254 }
1255
1256 static void wmadec_open(struct filter_node *fn)
1257 {
1258         fn->private_data = NULL;
1259         fn->min_iqs = 4096;
1260 }
1261
1262 const struct filter lsg_filter_cmd_com_wmadec_user_data = {
1263         .open = wmadec_open,
1264         .close = wmadec_close,
1265         .execute = wmadec_execute,
1266         .pre_select = generic_filter_pre_select,
1267         .post_select = wmadec_post_select,
1268 };