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   1 /*
   2  * COOK compatible decoder
   3  * Copyright (c) 2003 Sascha Sommer
   4  * Copyright (c) 2005 Benjamin Larsson
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  *
  20  */
  21
  22 /**
  23  * @file cook.c
  24  * Cook compatible decoder.
  25  * This decoder handles RealNetworks, RealAudio G2 data.
  26  * Cook is identified by the codec name cook in RM files.
  27  *
  28  * To use this decoder, a calling application must supply the extradata
  29  * bytes provided from the RM container; 8+ bytes for mono streams and
  30  * 16+ for stereo streams (maybe more).
  31  *
  32  * Codec technicalities (all this assume a buffer length of 1024):
  33  * Cook works with several different techniques to achieve its compression.
  34  * In the timedomain the buffer is divided into 8 pieces and quantized. If
  35  * two neighboring pieces have different quantization index a smooth
  36  * quantization curve is used to get a smooth overlap between the different
  37  * pieces.
  38  * To get to the transformdomain Cook uses a modulated lapped transform.
  39  * The transform domain has 50 subbands with 20 elements each. This
  40  * means only a maximum of 50*20=1000 coefficients are used out of the 1024
  41  * available.
  42  */
  43
  44 #include <math.h>
  45 #include <stddef.h>
  46 #include <stdio.h>
  47
  48 #define ALT_BITSTREAM_READER
  49 #include "avcodec.h"
  50 #include "bitstream.h"
  51 #include "dsputil.h"
  52
  53 #include "cookdata.h"
  54
  55 /* the different Cook versions */
  56 #define MONO_COOK1      0x1000001
  57 #define MONO_COOK2      0x1000002
  58 #define JOINT_STEREO    0x1000003
  59 #define MC_COOK         0x2000000   //multichannel Cook, not supported
  60
  61 #define SUBBAND_SIZE    20
  62 //#define COOKDEBUG
  63
  64 typedef struct {
  65     int     size;
  66     int     qidx_table1[8];
  67     int     qidx_table2[8];
  68 } COOKgain;
  69
  70 typedef struct __attribute__((__packed__)){
  71     /* codec data start */
  72     uint32_t cookversion;               //in network order, bigendian
  73     uint16_t samples_per_frame;         //amount of samples per frame per channel, bigendian
  74     uint16_t subbands;                  //amount of bands used in the frequency domain, bigendian
  75     /* Mono extradata ends here. */
  76     uint32_t unused;
  77     uint16_t js_subband_start;          //bigendian
  78     uint16_t js_vlc_bits;               //bigendian
  79     /* Stereo extradata ends here. */
  80 } COOKextradata;
  81
  82
  83 typedef struct {
  84     GetBitContext       gb;
  85     /* stream data */
  86     int                 nb_channels;
  87     int                 joint_stereo;
  88     int                 bit_rate;
  89     int                 sample_rate;
  90     int                 samples_per_channel;
  91     int                 samples_per_frame;
  92     int                 subbands;
  93     int                 log2_numvector_size;
  94     int                 numvector_size;                //1 << log2_numvector_size;
  95     int                 js_subband_start;
  96     int                 total_subbands;
  97     int                 num_vectors;
  98     int                 bits_per_subpacket;
  99     /* states */
 100     int                 random_state;
 101
 102     /* transform data */
 103     FFTContext          fft_ctx;
 104     FFTSample           mlt_tmp[1024] __attribute__((aligned(16))); /* temporary storage for imlt */
 105     float*              mlt_window;
 106     float*              mlt_precos;
 107     float*              mlt_presin;
 108     float*              mlt_postcos;
 109     int                 fft_size;
 110     int                 fft_order;
 111     int                 mlt_size;       //modulated lapped transform size
 112
 113     /* gain buffers */
 114     COOKgain*           gain_now_ptr;
 115     COOKgain*           gain_previous_ptr;
 116     COOKgain            gain_current;
 117     COOKgain            gain_now;
 118     COOKgain            gain_previous;
 119     COOKgain            gain_channel1[2];
 120     COOKgain            gain_channel2[2];
 121
 122     /* VLC data */
 123     int                 js_vlc_bits;
 124     VLC                 envelope_quant_index[13];
 125     VLC                 sqvh[7];          //scalar quantization
 126     VLC                 ccpl;             //channel coupling
 127
 128     /* generatable tables and related variables */
 129     int                 gain_size_factor;
 130     float               gain_table[23];
 131     float               pow2tab[127];
 132     float               rootpow2tab[127];
 133
 134     /* data buffers */
 135
 136     uint8_t*            decoded_bytes_buffer;
 137     float               mono_mdct_output[2048] __attribute__((aligned(16)));
 138     float*              previous_buffer_ptr[2];
 139     float               mono_previous_buffer1[1024];
 140     float               mono_previous_buffer2[1024];
 141     float*              decode_buf_ptr[4];
 142     float*              decode_buf_ptr2[2];
 143     float               decode_buffer_1[1024];
 144     float               decode_buffer_2[1024];
 145     float               decode_buffer_3[1024];
 146     float               decode_buffer_4[1024];
 147 } COOKContext;
 148
 149 /* debug functions */
 150
 151 #ifdef COOKDEBUG
 152 static void dump_float_table(float* table, int size, int delimiter) {
 153     int i=0;
 154     av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
 155     for (i=0 ; i<size ; i++) {
 156         av_log(NULL, AV_LOG_ERROR, "%5.1f, ", table[i]);
 157         if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
 158     }
 159 }
 160
 161 static void dump_int_table(int* table, int size, int delimiter) {
 162     int i=0;
 163     av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
 164     for (i=0 ; i<size ; i++) {
 165         av_log(NULL, AV_LOG_ERROR, "%d, ", table[i]);
 166         if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
 167     }
 168 }
 169
 170 static void dump_short_table(short* table, int size, int delimiter) {
 171     int i=0;
 172     av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
 173     for (i=0 ; i<size ; i++) {
 174         av_log(NULL, AV_LOG_ERROR, "%d, ", table[i]);
 175         if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
 176     }
 177 }
 178
 179 #endif
 180
 181 /*************** init functions ***************/
 182
 183 /* table generator */
 184 static void init_pow2table(COOKContext *q){
 185     int i;
 186     q->pow2tab[63] = 1.0;
 187     for (i=1 ; i<64 ; i++){
 188         q->pow2tab[63+i]=(float)((uint64_t)1<<i);
 189         q->pow2tab[63-i]=1.0/(float)((uint64_t)1<<i);
 190     }
 191 }
 192
 193 /* table generator */
 194 static void init_rootpow2table(COOKContext *q){
 195     int i;
 196     q->rootpow2tab[63] = 1.0;
 197     for (i=1 ; i<64 ; i++){
 198         q->rootpow2tab[63+i]=sqrt((float)((uint64_t)1<<i));
 199         q->rootpow2tab[63-i]=sqrt(1.0/(float)((uint64_t)1<<i));
 200     }
 201 }
 202
 203 /* table generator */
 204 static void init_gain_table(COOKContext *q) {
 205     int i;
 206     q->gain_size_factor = q->samples_per_channel/8;
 207     for (i=0 ; i<23 ; i++) {
 208         q->gain_table[i] = pow((double)q->pow2tab[i+52] ,
 209                                (1.0/(double)q->gain_size_factor));
 210     }
 211 }
 212
 213
 214 static int init_cook_vlc_tables(COOKContext *q) {
 215     int i, result;
 216
 217     result = 0;
 218     for (i=0 ; i<13 ; i++) {
 219         result &= init_vlc (&q->envelope_quant_index[i], 9, 24,
 220             envelope_quant_index_huffbits[i], 1, 1,
 221             envelope_quant_index_huffcodes[i], 2, 2, 0);
 222     }
 223     av_log(NULL,AV_LOG_DEBUG,"sqvh VLC init\n");
 224     for (i=0 ; i<7 ; i++) {
 225         result &= init_vlc (&q->sqvh[i], vhvlcsize_tab[i], vhsize_tab[i],
 226             cvh_huffbits[i], 1, 1,
 227             cvh_huffcodes[i], 2, 2, 0);
 228     }
 229
 230     if (q->nb_channels==2 && q->joint_stereo==1){
 231         result &= init_vlc (&q->ccpl, 6, (1<<q->js_vlc_bits)-1,
 232             ccpl_huffbits[q->js_vlc_bits-2], 1, 1,
 233             ccpl_huffcodes[q->js_vlc_bits-2], 2, 2, 0);
 234         av_log(NULL,AV_LOG_DEBUG,"Joint-stereo VLC used.\n");
 235     }
 236
 237     av_log(NULL,AV_LOG_DEBUG,"VLC tables initialized.\n");
 238     return result;
 239 }
 240
 241 static int init_cook_mlt(COOKContext *q) {
 242     int j;
 243     float alpha;
 244
 245     /* Allocate the buffers, could be replaced with a static [512]
 246        array if needed. */
 247     q->mlt_size = q->samples_per_channel;
 248     q->mlt_window = av_malloc(sizeof(float)*q->mlt_size);
 249     q->mlt_precos = av_malloc(sizeof(float)*q->mlt_size/2);
 250     q->mlt_presin = av_malloc(sizeof(float)*q->mlt_size/2);
 251     q->mlt_postcos = av_malloc(sizeof(float)*q->mlt_size/2);
 252
 253     /* Initialize the MLT window: simple sine window. */
 254     alpha = M_PI / (2.0 * (float)q->mlt_size);
 255     for(j=0 ; j<q->mlt_size ; j++) {
 256         q->mlt_window[j] = sin((j + 512.0/(float)q->mlt_size) * alpha);
 257     }
 258
 259     /* pre/post twiddle factors */
 260     for (j=0 ; j<q->mlt_size/2 ; j++){
 261         q->mlt_precos[j] = cos( ((j+0.25)*M_PI)/q->mlt_size);
 262         q->mlt_presin[j] = sin( ((j+0.25)*M_PI)/q->mlt_size);
 263         q->mlt_postcos[j] = (float)sqrt(2.0/(float)q->mlt_size)*cos( ((float)j*M_PI) /q->mlt_size); //sqrt(2/MLT_size) = scalefactor
 264     }
 265
 266     /* Initialize the FFT. */
 267     ff_fft_init(&q->fft_ctx, av_log2(q->mlt_size)-1, 0);
 268     av_log(NULL,AV_LOG_DEBUG,"FFT initialized, order = %d.\n",
 269            av_log2(q->samples_per_channel)-1);
 270
 271     return (int)(q->mlt_window && q->mlt_precos && q->mlt_presin && q->mlt_postcos);
 272 }
 273
 274 /*************** init functions end ***********/
 275
 276 /**
 277  * Cook indata decoding, every 32 bits are XORed with 0x37c511f2.
 278  * Why? No idea, some checksum/error detection method maybe.
 279  * Nice way to waste CPU cycles.
 280  *
 281  * @param in        pointer to 32bit array of indata
 282  * @param bits      amount of bits
 283  * @param out       pointer to 32bit array of outdata
 284  */
 285
 286 static inline void decode_bytes(uint8_t* inbuffer, uint8_t* out, int bytes){
 287     int i;
 288     uint32_t* buf = (uint32_t*) inbuffer;
 289     uint32_t* obuf = (uint32_t*) out;
 290     /* FIXME: 64 bit platforms would be able to do 64 bits at a time.
 291      * I'm too lazy though, should be something like
 292      * for(i=0 ; i<bitamount/64 ; i++)
 293      *     (int64_t)out[i] = 0x37c511f237c511f2^be2me_64(int64_t)in[i]);
 294      * Buffer alignment needs to be checked. */
 295
 296
 297     for(i=0 ; i<bytes/4 ; i++){
 298 #ifdef WORDS_BIGENDIAN
 299         obuf[i] = 0x37c511f2^buf[i];
 300 #else
 301         obuf[i] = 0xf211c537^buf[i];
 302 #endif
 303     }
 304 }
 305
 306 /**
 307  * Cook uninit
 308  */
 309
 310 static int cook_decode_close(AVCodecContext *avctx)
 311 {
 312     int i;
 313     COOKContext *q = avctx->priv_data;
 314     av_log(NULL,AV_LOG_DEBUG, "Deallocating memory.\n");
 315
 316     /* Free allocated memory buffers. */
 317     av_free(q->mlt_window);
 318     av_free(q->mlt_precos);
 319     av_free(q->mlt_presin);
 320     av_free(q->mlt_postcos);
 321     av_free(q->decoded_bytes_buffer);
 322
 323     /* Free the transform. */
 324     ff_fft_end(&q->fft_ctx);
 325
 326     /* Free the VLC tables. */
 327     for (i=0 ; i<13 ; i++) {
 328         free_vlc(&q->envelope_quant_index[i]);
 329     }
 330     for (i=0 ; i<7 ; i++) {
 331         free_vlc(&q->sqvh[i]);
 332     }
 333     if(q->nb_channels==2 && q->joint_stereo==1 ){
 334         free_vlc(&q->ccpl);
 335     }
 336
 337     av_log(NULL,AV_LOG_DEBUG,"Memory deallocated.\n");
 338
 339     return 0;
 340 }
 341
 342 /**
 343  * Fill the COOKgain structure for the timedomain quantization.
 344  *
 345  * @param q                 pointer to the COOKContext
 346  * @param gaininfo          pointer to the COOKgain
 347  */
 348
 349 static void decode_gain_info(GetBitContext *gb, COOKgain* gaininfo) {
 350     int i;
 351
 352     while (get_bits1(gb)) {}
 353
 354     gaininfo->size = get_bits_count(gb) - 1;     //amount of elements*2 to update
 355
 356     if (get_bits_count(gb) - 1 <= 0) return;
 357
 358     for (i=0 ; i<gaininfo->size ; i++){
 359         gaininfo->qidx_table1[i] = get_bits(gb,3);
 360         if (get_bits1(gb)) {
 361             gaininfo->qidx_table2[i] = get_bits(gb,4) - 7;  //convert to signed
 362         } else {
 363             gaininfo->qidx_table2[i] = -1;
 364         }
 365     }
 366 }
 367
 368 /**
 369  * Create the quant index table needed for the envelope.
 370  *
 371  * @param q                 pointer to the COOKContext
 372  * @param quant_index_table pointer to the array
 373  */
 374
 375 static void decode_envelope(COOKContext *q, int* quant_index_table) {
 376     int i,j, vlc_index;
 377     int bitbias;
 378
 379     bitbias = get_bits_count(&q->gb);
 380     quant_index_table[0]= get_bits(&q->gb,6) - 6;       //This is used later in categorize
 381
 382     for (i=1 ; i < q->total_subbands ; i++){
 383         vlc_index=i;
 384         if (i >= q->js_subband_start * 2) {
 385             vlc_index-=q->js_subband_start;
 386         } else {
 387             vlc_index/=2;
 388             if(vlc_index < 1) vlc_index = 1;
 389         }
 390         if (vlc_index>13) vlc_index = 13;           //the VLC tables >13 are identical to No. 13
 391
 392         j = get_vlc2(&q->gb, q->envelope_quant_index[vlc_index-1].table,
 393                      q->envelope_quant_index[vlc_index-1].bits,2);
 394         quant_index_table[i] = quant_index_table[i-1] + j - 12;    //differential encoding
 395     }
 396 }
 397
 398 /**
 399  * Create the quant value table.
 400  *
 401  * @param q                 pointer to the COOKContext
 402  * @param quant_value_table pointer to the array
 403  */
 404
 405 static void inline dequant_envelope(COOKContext *q, int* quant_index_table,
 406                                     float* quant_value_table){
 407
 408     int i;
 409     for(i=0 ; i < q->total_subbands ; i++){
 410         quant_value_table[i] = q->rootpow2tab[quant_index_table[i]+63];
 411     }
 412 }
 413
 414 /**
 415  * Calculate the category and category_index vector.
 416  *
 417  * @param q                     pointer to the COOKContext
 418  * @param quant_index_table     pointer to the array
 419  * @param category              pointer to the category array
 420  * @param category_index        pointer to the category_index array
 421  */
 422
 423 static void categorize(COOKContext *q, int* quant_index_table,
 424                        int* category, int* category_index){
 425     int exp_idx, bias, tmpbias, bits_left, num_bits, index, v, i, j;
 426     int exp_index2[102];
 427     int exp_index1[102];
 428
 429     int tmp_categorize_array1[128];
 430     int tmp_categorize_array1_idx=0;
 431     int tmp_categorize_array2[128];
 432     int tmp_categorize_array2_idx=0;
 433     int category_index_size=0;
 434
 435     bits_left =  q->bits_per_subpacket - get_bits_count(&q->gb);
 436
 437     if(bits_left > q->samples_per_channel) {
 438         bits_left = q->samples_per_channel +
 439                     ((bits_left - q->samples_per_channel)*5)/8;
 440         //av_log(NULL, AV_LOG_ERROR, "bits_left = %d\n",bits_left);
 441     }
 442
 443     memset(&exp_index1,0,102*sizeof(int));
 444     memset(&exp_index2,0,102*sizeof(int));
 445     memset(&tmp_categorize_array1,0,128*sizeof(int));
 446     memset(&tmp_categorize_array2,0,128*sizeof(int));
 447
 448     bias=-32;
 449
 450     /* Estimate bias. */
 451     for (i=32 ; i>0 ; i=i/2){
 452         num_bits = 0;
 453         index = 0;
 454         for (j=q->total_subbands ; j>0 ; j--){
 455             exp_idx = (i - quant_index_table[index] + bias) / 2;
 456             if (exp_idx<0){
 457                 exp_idx=0;
 458             } else if(exp_idx >7) {
 459                 exp_idx=7;
 460             }
 461             index++;
 462             num_bits+=expbits_tab[exp_idx];
 463         }
 464         if(num_bits >= bits_left - 32){
 465             bias+=i;
 466         }
 467     }
 468
 469     /* Calculate total number of bits. */
 470     num_bits=0;
 471     for (i=0 ; i<q->total_subbands ; i++) {
 472         exp_idx = (bias - quant_index_table[i]) / 2;
 473         if (exp_idx<0) {
 474             exp_idx=0;
 475         } else if(exp_idx >7) {
 476             exp_idx=7;
 477         }
 478         num_bits += expbits_tab[exp_idx];
 479         exp_index1[i] = exp_idx;
 480         exp_index2[i] = exp_idx;
 481     }
 482     tmpbias = bias = num_bits;
 483
 484     for (j = 1 ; j < q->numvector_size ; j++) {
 485         if (tmpbias + bias > 2*bits_left) {  /* ---> */
 486             int max = -999999;
 487             index=-1;
 488             for (i=0 ; i<q->total_subbands ; i++){
 489                 if (exp_index1[i] < 7) {
 490                     v = (-2*exp_index1[i]) - quant_index_table[i] - 32;
 491                     if ( v >= max) {
 492                         max = v;
 493                         index = i;
 494                     }
 495                 }
 496             }
 497             if(index==-1)break;
 498             tmp_categorize_array1[tmp_categorize_array1_idx++] = index;
 499             tmpbias -= expbits_tab[exp_index1[index]] -
 500                        expbits_tab[exp_index1[index]+1];
 501             ++exp_index1[index];
 502         } else {  /* <--- */
 503             int min = 999999;
 504             index=-1;
 505             for (i=0 ; i<q->total_subbands ; i++){
 506                 if(exp_index2[i] > 0){
 507                     v = (-2*exp_index2[i])-quant_index_table[i];
 508                     if ( v < min) {
 509                         min = v;
 510                         index = i;
 511                     }
 512                 }
 513             }
 514             if(index == -1)break;
 515             tmp_categorize_array2[tmp_categorize_array2_idx++] = index;
 516             tmpbias -= expbits_tab[exp_index2[index]] -
 517                        expbits_tab[exp_index2[index]-1];
 518             --exp_index2[index];
 519         }
 520     }
 521
 522     for(i=0 ; i<q->total_subbands ; i++)
 523         category[i] = exp_index2[i];
 524
 525     /* Concatenate the two arrays. */
 526     for(i=tmp_categorize_array2_idx-1 ; i >= 0; i--)
 527         category_index[category_index_size++] =  tmp_categorize_array2[i];
 528
 529     for(i=0;i<tmp_categorize_array1_idx;i++)
 530         category_index[category_index_size++ ] =  tmp_categorize_array1[i];
 531
 532     /* FIXME: mc_sich_ra8_20.rm triggers this, not sure with what we
 533        should fill the remaining bytes. */
 534     for(i=category_index_size;i<q->numvector_size;i++)
 535         category_index[i]=0;
 536
 537 }
 538
 539
 540 /**
 541  * Expand the category vector.
 542  *
 543  * @param q                     pointer to the COOKContext
 544  * @param category              pointer to the category array
 545  * @param category_index        pointer to the category_index array
 546  */
 547
 548 static void inline expand_category(COOKContext *q, int* category,
 549                                    int* category_index){
 550     int i;
 551     for(i=0 ; i<q->num_vectors ; i++){
 552         ++category[category_index[i]];
 553     }
 554 }
 555
 556 /**
 557  * The real requantization of the mltcoefs
 558  *
 559  * @param q                     pointer to the COOKContext
 560  * @param index                 index
 561  * @param band                  current subband
 562  * @param quant_value_table     pointer to the array
 563  * @param subband_coef_index    array of indexes to quant_centroid_tab
 564  * @param subband_coef_noise    use random noise instead of predetermined value
 565  * @param mlt_buffer            pointer to the mlt buffer
 566  */
 567
 568
 569 static void scalar_dequant(COOKContext *q, int index, int band,
 570                            float* quant_value_table, int* subband_coef_index,
 571                            int* subband_coef_noise, float* mlt_buffer){
 572     int i;
 573     float f1;
 574
 575     for(i=0 ; i<SUBBAND_SIZE ; i++) {
 576         if (subband_coef_index[i]) {
 577             if (subband_coef_noise[i]) {
 578                 f1 = -quant_centroid_tab[index][subband_coef_index[i]];
 579             } else {
 580                 f1 = quant_centroid_tab[index][subband_coef_index[i]];
 581             }
 582         } else {
 583             /* noise coding if subband_coef_noise[i] == 0 */
 584             q->random_state = q->random_state * 214013 + 2531011;    //typical RNG numbers
 585             f1 = randsign[(q->random_state/0x1000000)&1] * dither_tab[index]; //>>31
 586         }
 587         mlt_buffer[band*20+ i] = f1 * quant_value_table[band];
 588     }
 589 }
 590 /**
 591  * Unpack the subband_coef_index and subband_coef_noise vectors.
 592  *
 593  * @param q                     pointer to the COOKContext
 594  * @param category              pointer to the category array
 595  * @param subband_coef_index    array of indexes to quant_centroid_tab
 596  * @param subband_coef_noise    use random noise instead of predetermined value
 597  */
 598
 599 static int unpack_SQVH(COOKContext *q, int category, int* subband_coef_index,
 600                        int* subband_coef_noise) {
 601     int i,j;
 602     int vlc, vd ,tmp, result;
 603     int ub;
 604     int cb;
 605
 606     vd = vd_tab[category];
 607     result = 0;
 608     for(i=0 ; i<vpr_tab[category] ; i++){
 609         ub = get_bits_count(&q->gb);
 610         vlc = get_vlc2(&q->gb, q->sqvh[category].table, q->sqvh[category].bits, 3);
 611         cb = get_bits_count(&q->gb);
 612         if (q->bits_per_subpacket < get_bits_count(&q->gb)){
 613             vlc = 0;
 614             result = 1;
 615         }
 616         for(j=vd-1 ; j>=0 ; j--){
 617             tmp = (vlc * invradix_tab[category])/0x100000;
 618             subband_coef_index[vd*i+j] = vlc - tmp * (kmax_tab[category]+1);
 619             vlc = tmp;
 620         }
 621         for(j=0 ; j<vd ; j++){
 622             if (subband_coef_index[i*vd + j]) {
 623                 if(get_bits_count(&q->gb) < q->bits_per_subpacket){
 624                     subband_coef_noise[i*vd+j] = get_bits1(&q->gb);
 625                 } else {
 626                     result=1;
 627                     subband_coef_noise[i*vd+j]=0;
 628                 }
 629             } else {
 630                 subband_coef_noise[i*vd+j]=0;
 631             }
 632         }
 633     }
 634     return result;
 635 }
 636
 637
 638 /**
 639  * Fill the mlt_buffer with mlt coefficients.
 640  *
 641  * @param q                 pointer to the COOKContext
 642  * @param category          pointer to the category array
 643  * @param quant_value_table pointer to the array
 644  * @param mlt_buffer        pointer to mlt coefficients
 645  */
 646
 647
 648 static void decode_vectors(COOKContext* q, int* category,
 649                            float* quant_value_table, float* mlt_buffer){
 650     /* A zero in this table means that the subband coefficient is
 651        random noise coded. */
 652     int subband_coef_noise[SUBBAND_SIZE];
 653     /* A zero in this table means that the subband coefficient is a
 654        positive multiplicator. */
 655     int subband_coef_index[SUBBAND_SIZE];
 656     int band, j;
 657     int index=0;
 658
 659     for(band=0 ; band<q->total_subbands ; band++){
 660         index = category[band];
 661         if(category[band] < 7){
 662             if(unpack_SQVH(q, category[band], subband_coef_index, subband_coef_noise)){
 663                 index=7;
 664                 for(j=0 ; j<q->total_subbands ; j++) category[band+j]=7;
 665             }
 666         }
 667         if(index==7) {
 668             memset(subband_coef_index, 0, sizeof(subband_coef_index));
 669             memset(subband_coef_noise, 0, sizeof(subband_coef_noise));
 670         }
 671         scalar_dequant(q, index, band, quant_value_table, subband_coef_index,
 672                        subband_coef_noise, mlt_buffer);
 673     }
 674
 675     if(q->total_subbands*SUBBAND_SIZE >= q->samples_per_channel){
 676         return;
 677     }
 678 }
 679
 680
 681 /**
 682  * function for decoding mono data
 683  *
 684  * @param q                 pointer to the COOKContext
 685  * @param mlt_buffer1       pointer to left channel mlt coefficients
 686  * @param mlt_buffer2       pointer to right channel mlt coefficients
 687  */
 688
 689 static void mono_decode(COOKContext *q, float* mlt_buffer) {
 690
 691     int category_index[128];
 692     float quant_value_table[102];
 693     int quant_index_table[102];
 694     int category[128];
 695
 696     memset(&category, 0, 128*sizeof(int));
 697     memset(&quant_value_table, 0, 102*sizeof(int));
 698     memset(&category_index, 0, 128*sizeof(int));
 699
 700     decode_envelope(q, quant_index_table);
 701     q->num_vectors = get_bits(&q->gb,q->log2_numvector_size);
 702     dequant_envelope(q, quant_index_table, quant_value_table);
 703     categorize(q, quant_index_table, category, category_index);
 704     expand_category(q, category, category_index);
 705     decode_vectors(q, category, quant_value_table, mlt_buffer);
 706 }
 707
 708
 709 /**
 710  * The modulated lapped transform, this takes transform coefficients
 711  * and transforms them into timedomain samples. This is done through
 712  * an FFT-based algorithm with pre- and postrotation steps.
 713  * A window and reorder step is also included.
 714  *
 715  * @param q                 pointer to the COOKContext
 716  * @param inbuffer          pointer to the mltcoefficients
 717  * @param outbuffer         pointer to the timedomain buffer
 718  * @param mlt_tmp           pointer to temporary storage space
 719  */
 720
 721 static void cook_imlt(COOKContext *q, float* inbuffer, float* outbuffer,
 722                       float* mlt_tmp){
 723     int i;
 724
 725     /* prerotation */
 726     for(i=0 ; i<q->mlt_size ; i+=2){
 727         outbuffer[i] = (q->mlt_presin[i/2] * inbuffer[q->mlt_size-1-i]) +
 728                        (q->mlt_precos[i/2] * inbuffer[i]);
 729         outbuffer[i+1] = (q->mlt_precos[i/2] * inbuffer[q->mlt_size-1-i]) -
 730                          (q->mlt_presin[i/2] * inbuffer[i]);
 731     }
 732
 733     /* FFT */
 734     ff_fft_permute(&q->fft_ctx, (FFTComplex *) outbuffer);
 735     ff_fft_calc (&q->fft_ctx, (FFTComplex *) outbuffer);
 736
 737     /* postrotation */
 738     for(i=0 ; i<q->mlt_size ; i+=2){
 739         mlt_tmp[i] =               (q->mlt_postcos[(q->mlt_size-1-i)/2] * outbuffer[i+1]) +
 740                                    (q->mlt_postcos[i/2] * outbuffer[i]);
 741         mlt_tmp[q->mlt_size-1-i] = (q->mlt_postcos[(q->mlt_size-1-i)/2] * outbuffer[i]) -
 742                                    (q->mlt_postcos[i/2] * outbuffer[i+1]);
 743     }
 744
 745     /* window and reorder */
 746     for(i=0 ; i<q->mlt_size/2 ; i++){
 747         outbuffer[i] = mlt_tmp[q->mlt_size/2-1-i] * q->mlt_window[i];
 748         outbuffer[q->mlt_size-1-i]= mlt_tmp[q->mlt_size/2-1-i] *
 749                                     q->mlt_window[q->mlt_size-1-i];
 750         outbuffer[q->mlt_size+i]= mlt_tmp[q->mlt_size/2+i] *
 751                                   q->mlt_window[q->mlt_size-1-i];
 752         outbuffer[2*q->mlt_size-1-i]= -(mlt_tmp[q->mlt_size/2+i] *
 753                                       q->mlt_window[i]);
 754     }
 755 }
 756
 757
 758 /**
 759  * the actual requantization of the timedomain samples
 760  *
 761  * @param q                 pointer to the COOKContext
 762  * @param buffer            pointer to the timedomain buffer
 763  * @param gain_index        index for the block multiplier
 764  * @param gain_index_next   index for the next block multiplier
 765  */
 766
 767 static void interpolate(COOKContext *q, float* buffer,
 768                         int gain_index, int gain_index_next){
 769     int i;
 770     float fc1, fc2;
 771     fc1 = q->pow2tab[gain_index+63];
 772
 773     if(gain_index == gain_index_next){              //static gain
 774         for(i=0 ; i<q->gain_size_factor ; i++){
 775             buffer[i]*=fc1;
 776         }
 777         return;
 778     } else {                                        //smooth gain
 779         fc2 = q->gain_table[11 + (gain_index_next-gain_index)];
 780         for(i=0 ; i<q->gain_size_factor ; i++){
 781             buffer[i]*=fc1;
 782             fc1*=fc2;
 783         }
 784         return;
 785     }
 786 }
 787
 788 /**
 789  * timedomain requantization of the timedomain samples
 790  *
 791  * @param q                 pointer to the COOKContext
 792  * @param buffer            pointer to the timedomain buffer
 793  * @param gain_now          current gain structure
 794  * @param gain_previous     previous gain structure
 795  */
 796
 797 static void gain_window(COOKContext *q, float* buffer, COOKgain* gain_now,
 798                         COOKgain* gain_previous){
 799     int i, index;
 800     int gain_index[9];
 801     int tmp_gain_index;
 802
 803     gain_index[8]=0;
 804     index = gain_previous->size;
 805     for (i=7 ; i>=0 ; i--) {
 806         if(index && gain_previous->qidx_table1[index-1]==i) {
 807             gain_index[i] = gain_previous->qidx_table2[index-1];
 808             index--;
 809         } else {
 810             gain_index[i]=gain_index[i+1];
 811         }
 812     }
 813     /* This is applied to the to be previous data buffer. */
 814     for(i=0;i<8;i++){
 815         interpolate(q, &buffer[q->samples_per_channel+q->gain_size_factor*i],
 816                     gain_index[i], gain_index[i+1]);
 817     }
 818
 819     tmp_gain_index = gain_index[0];
 820     index = gain_now->size;
 821     for (i=7 ; i>=0 ; i--) {
 822         if(index && gain_now->qidx_table1[index-1]==i) {
 823             gain_index[i]= gain_now->qidx_table2[index-1];
 824             index--;
 825         } else {
 826             gain_index[i]=gain_index[i+1];
 827         }
 828     }
 829
 830     /* This is applied to the to be current block. */
 831     for(i=0;i<8;i++){
 832         interpolate(q, &buffer[i*q->gain_size_factor],
 833                     tmp_gain_index+gain_index[i],
 834                     tmp_gain_index+gain_index[i+1]);
 835     }
 836 }
 837
 838
 839 /**
 840  * mlt overlapping and buffer management
 841  *
 842  * @param q                 pointer to the COOKContext
 843  * @param buffer            pointer to the timedomain buffer
 844  * @param gain_now          current gain structure
 845  * @param gain_previous     previous gain structure
 846  * @param previous_buffer   pointer to the previous buffer to be used for overlapping
 847  *
 848  */
 849
 850 static void gain_compensate(COOKContext *q, float* buffer, COOKgain* gain_now,
 851                             COOKgain* gain_previous, float* previous_buffer) {
 852     int i;
 853     if((gain_now->size  || gain_previous->size)) {
 854         gain_window(q, buffer, gain_now, gain_previous);
 855     }
 856
 857     /* Overlap with the previous block. */
 858     for(i=0 ; i<q->samples_per_channel ; i++) buffer[i]+=previous_buffer[i];
 859
 860     /* Save away the current to be previous block. */
 861     memcpy(previous_buffer, buffer+q->samples_per_channel,
 862            sizeof(float)*q->samples_per_channel);
 863 }
 864
 865
 866 /**
 867  * function for getting the jointstereo coupling information
 868  *
 869  * @param q                 pointer to the COOKContext
 870  * @param decouple_tab      decoupling array
 871  *
 872  */
 873
 874 static void decouple_info(COOKContext *q, int* decouple_tab){
 875     int length, i;
 876
 877     if(get_bits1(&q->gb)) {
 878         if(cplband[q->js_subband_start] > cplband[q->subbands-1]) return;
 879
 880         length = cplband[q->subbands-1] - cplband[q->js_subband_start] + 1;
 881         for (i=0 ; i<length ; i++) {
 882             decouple_tab[cplband[q->js_subband_start] + i] = get_vlc2(&q->gb, q->ccpl.table, q->ccpl.bits, 2);
 883         }
 884         return;
 885     }
 886
 887     if(cplband[q->js_subband_start] > cplband[q->subbands-1]) return;
 888
 889     length = cplband[q->subbands-1] - cplband[q->js_subband_start] + 1;
 890     for (i=0 ; i<length ; i++) {
 891        decouple_tab[cplband[q->js_subband_start] + i] = get_bits(&q->gb, q->js_vlc_bits);
 892     }
 893     return;
 894 }
 895
 896
 897 /**
 898  * function for decoding joint stereo data
 899  *
 900  * @param q                 pointer to the COOKContext
 901  * @param mlt_buffer1       pointer to left channel mlt coefficients
 902  * @param mlt_buffer2       pointer to right channel mlt coefficients
 903  */
 904
 905 static void joint_decode(COOKContext *q, float* mlt_buffer1,
 906                          float* mlt_buffer2) {
 907     int i,j;
 908     int decouple_tab[SUBBAND_SIZE];
 909     float decode_buffer[1060];
 910     int idx, cpl_tmp,tmp_idx;
 911     float f1,f2;
 912     float* cplscale;
 913
 914     memset(decouple_tab, 0, sizeof(decouple_tab));
 915     memset(decode_buffer, 0, sizeof(decode_buffer));
 916
 917     /* Make sure the buffers are zeroed out. */
 918     memset(mlt_buffer1,0, 1024*sizeof(float));
 919     memset(mlt_buffer2,0, 1024*sizeof(float));
 920     decouple_info(q, decouple_tab);
 921     mono_decode(q, decode_buffer);
 922
 923     /* The two channels are stored interleaved in decode_buffer. */
 924     for (i=0 ; i<q->js_subband_start ; i++) {
 925         for (j=0 ; j<SUBBAND_SIZE ; j++) {
 926             mlt_buffer1[i*20+j] = decode_buffer[i*40+j];
 927             mlt_buffer2[i*20+j] = decode_buffer[i*40+20+j];
 928         }
 929     }
 930
 931     /* When we reach js_subband_start (the higher frequencies)
 932        the coefficients are stored in a coupling scheme. */
 933     idx = (1 << q->js_vlc_bits) - 1;
 934     for (i=q->js_subband_start ; i<q->subbands ; i++) {
 935         cpl_tmp = cplband[i];
 936         idx -=decouple_tab[cpl_tmp];
 937         cplscale = (float*)cplscales[q->js_vlc_bits-2];  //choose decoupler table
 938         f1 = cplscale[decouple_tab[cpl_tmp]];
 939         f2 = cplscale[idx-1];
 940         for (j=0 ; j<SUBBAND_SIZE ; j++) {
 941             tmp_idx = ((q->js_subband_start + i)*20)+j;
 942             mlt_buffer1[20*i + j] = f1 * decode_buffer[tmp_idx];
 943             mlt_buffer2[20*i + j] = f2 * decode_buffer[tmp_idx];
 944         }
 945         idx = (1 << q->js_vlc_bits) - 1;
 946     }
 947 }
 948
 949 /**
 950  * Cook subpacket decoding. This function returns one decoded subpacket,
 951  * usually 1024 samples per channel.
 952  *
 953  * @param q                 pointer to the COOKContext
 954  * @param inbuffer          pointer to the inbuffer
 955  * @param sub_packet_size   subpacket size
 956  * @param outbuffer         pointer to the outbuffer
 957  */
 958
 959
 960 static int decode_subpacket(COOKContext *q, uint8_t *inbuffer,
 961                             int sub_packet_size, int16_t *outbuffer) {
 962     int i,j;
 963     int value;
 964     float* tmp_ptr;
 965
 966     /* packet dump */
 967 //    for (i=0 ; i<sub_packet_size ; i++) {
 968 //        av_log(NULL, AV_LOG_ERROR, "%02x", inbuffer[i]);
 969 //    }
 970 //    av_log(NULL, AV_LOG_ERROR, "\n");
 971
 972     decode_bytes(inbuffer, q->decoded_bytes_buffer, sub_packet_size);
 973     init_get_bits(&q->gb, q->decoded_bytes_buffer, sub_packet_size*8);
 974     decode_gain_info(&q->gb, &q->gain_current);
 975
 976     if(q->nb_channels==2 && q->joint_stereo==1){
 977         joint_decode(q, q->decode_buf_ptr[0], q->decode_buf_ptr[2]);
 978
 979         /* Swap buffer pointers. */
 980         tmp_ptr = q->decode_buf_ptr[1];
 981         q->decode_buf_ptr[1] = q->decode_buf_ptr[0];
 982         q->decode_buf_ptr[0] = tmp_ptr;
 983         tmp_ptr = q->decode_buf_ptr[3];
 984         q->decode_buf_ptr[3] = q->decode_buf_ptr[2];
 985         q->decode_buf_ptr[2] = tmp_ptr;
 986
 987         /* FIXME: Rethink the gainbuffer handling, maybe a rename?
 988            now/previous swap */
 989         q->gain_now_ptr = &q->gain_now;
 990         q->gain_previous_ptr = &q->gain_previous;
 991         for (i=0 ; i<q->nb_channels ; i++){
 992
 993             cook_imlt(q, q->decode_buf_ptr[i*2], q->mono_mdct_output, q->mlt_tmp);
 994             gain_compensate(q, q->mono_mdct_output, q->gain_now_ptr,
 995                             q->gain_previous_ptr, q->previous_buffer_ptr[0]);
 996
 997             /* Swap out the previous buffer. */
 998             tmp_ptr = q->previous_buffer_ptr[0];
 999             q->previous_buffer_ptr[0] = q->previous_buffer_ptr[1];
1000             q->previous_buffer_ptr[1] = tmp_ptr;
1001
1002             /* Clip and convert the floats to 16 bits. */
1003             for (j=0 ; j<q->samples_per_frame ; j++){
1004                 value = lrintf(q->mono_mdct_output[j]);
1005                 if(value < -32768) value = -32768;
1006                 else if(value > 32767) value = 32767;
1007                 outbuffer[2*j+i] = value;
1008             }
1009         }
1010
1011         memcpy(&q->gain_now, &q->gain_previous, sizeof(COOKgain));
1012         memcpy(&q->gain_previous, &q->gain_current, sizeof(COOKgain));
1013
1014     } else if (q->nb_channels==2 && q->joint_stereo==0) {
1015             /* channel 0 */
1016             mono_decode(q, q->decode_buf_ptr2[0]);
1017
1018             tmp_ptr = q->decode_buf_ptr2[0];
1019             q->decode_buf_ptr2[0] = q->decode_buf_ptr2[1];
1020             q->decode_buf_ptr2[1] = tmp_ptr;
1021
1022             memcpy(&q->gain_channel1[0], &q->gain_current ,sizeof(COOKgain));
1023             q->gain_now_ptr = &q->gain_channel1[0];
1024             q->gain_previous_ptr = &q->gain_channel1[1];
1025
1026             cook_imlt(q, q->decode_buf_ptr2[0], q->mono_mdct_output,q->mlt_tmp);
1027             gain_compensate(q, q->mono_mdct_output, q->gain_now_ptr,
1028                             q->gain_previous_ptr, q->mono_previous_buffer1);
1029
1030             memcpy(&q->gain_channel1[1], &q->gain_channel1[0],sizeof(COOKgain));
1031
1032
1033             for (j=0 ; j<q->samples_per_frame ; j++){
1034                 value = lrintf(q->mono_mdct_output[j]);
1035                 if(value < -32768) value = -32768;
1036                 else if(value > 32767) value = 32767;
1037                 outbuffer[2*j+1] = value;
1038             }
1039
1040             /* channel 1 */
1041             //av_log(NULL,AV_LOG_ERROR,"bits = %d\n",get_bits_count(&q->gb));
1042             init_get_bits(&q->gb, q->decoded_bytes_buffer, sub_packet_size*8+q->bits_per_subpacket);
1043
1044             q->gain_now_ptr = &q->gain_channel2[0];
1045             q->gain_previous_ptr = &q->gain_channel2[1];
1046
1047             decode_gain_info(&q->gb, &q->gain_channel2[0]);
1048             mono_decode(q, q->decode_buf_ptr[0]);
1049
1050             tmp_ptr = q->decode_buf_ptr[0];
1051             q->decode_buf_ptr[0] = q->decode_buf_ptr[1];
1052             q->decode_buf_ptr[1] = tmp_ptr;
1053
1054             cook_imlt(q, q->decode_buf_ptr[0], q->mono_mdct_output,q->mlt_tmp);
1055             gain_compensate(q, q->mono_mdct_output, q->gain_now_ptr,
1056                             q->gain_previous_ptr, q->mono_previous_buffer2);
1057
1058             /* Swap out the previous buffer. */
1059             tmp_ptr = q->previous_buffer_ptr[0];
1060             q->previous_buffer_ptr[0] = q->previous_buffer_ptr[1];
1061             q->previous_buffer_ptr[1] = tmp_ptr;
1062
1063             memcpy(&q->gain_channel2[1], &q->gain_channel2[0] ,sizeof(COOKgain));
1064
1065             for (j=0 ; j<q->samples_per_frame ; j++){
1066                 value = lrintf(q->mono_mdct_output[j]);
1067                 if(value < -32768) value = -32768;
1068                 else if(value > 32767) value = 32767;
1069                 outbuffer[2*j] = value;
1070             }
1071
1072     } else {
1073         mono_decode(q, q->decode_buf_ptr[0]);
1074
1075         /* Swap buffer pointers. */
1076         tmp_ptr = q->decode_buf_ptr[1];
1077         q->decode_buf_ptr[1] = q->decode_buf_ptr[0];
1078         q->decode_buf_ptr[0] = tmp_ptr;
1079
1080         /* FIXME: Rethink the gainbuffer handling, maybe a rename?
1081            now/previous swap */
1082         q->gain_now_ptr = &q->gain_now;
1083         q->gain_previous_ptr = &q->gain_previous;
1084
1085         cook_imlt(q, q->decode_buf_ptr[0], q->mono_mdct_output,q->mlt_tmp);
1086         gain_compensate(q, q->mono_mdct_output, q->gain_now_ptr,
1087                         q->gain_previous_ptr, q->mono_previous_buffer1);
1088
1089         /* Clip and convert the floats to 16 bits */
1090         for (j=0 ; j<q->samples_per_frame ; j++){
1091             value = lrintf(q->mono_mdct_output[j]);
1092             if(value < -32768) value = -32768;
1093             else if(value > 32767) value = 32767;
1094             outbuffer[j] = value;
1095         }
1096         memcpy(&q->gain_now, &q->gain_previous, sizeof(COOKgain));
1097         memcpy(&q->gain_previous, &q->gain_current, sizeof(COOKgain));
1098     }
1099     return q->samples_per_frame * sizeof(int16_t);
1100 }
1101
1102
1103 /**
1104  * Cook frame decoding
1105  *
1106  * @param avctx     pointer to the AVCodecContext
1107  */
1108
1109 static int cook_decode_frame(AVCodecContext *avctx,
1110             void *data, int *data_size,
1111             uint8_t *buf, int buf_size) {
1112     COOKContext *q = avctx->priv_data;
1113
1114     if (buf_size < avctx->block_align)
1115         return buf_size;
1116
1117     *data_size = decode_subpacket(q, buf, avctx->block_align, data);
1118
1119     return avctx->block_align;
1120 }
1121
1122 #ifdef COOKDEBUG
1123 static void dump_cook_context(COOKContext *q, COOKextradata *e)
1124 {
1125     //int i=0;
1126 #define PRINT(a,b) av_log(NULL,AV_LOG_ERROR," %s = %d\n", a, b);
1127     av_log(NULL,AV_LOG_ERROR,"COOKextradata\n");
1128     av_log(NULL,AV_LOG_ERROR,"cookversion=%x\n",e->cookversion);
1129     if (e->cookversion > MONO_COOK2) {
1130         PRINT("js_subband_start",e->js_subband_start);
1131         PRINT("js_vlc_bits",e->js_vlc_bits);
1132     }
1133     av_log(NULL,AV_LOG_ERROR,"COOKContext\n");
1134     PRINT("nb_channels",q->nb_channels);
1135     PRINT("bit_rate",q->bit_rate);
1136     PRINT("sample_rate",q->sample_rate);
1137     PRINT("samples_per_channel",q->samples_per_channel);
1138     PRINT("samples_per_frame",q->samples_per_frame);
1139     PRINT("subbands",q->subbands);
1140     PRINT("random_state",q->random_state);
1141     PRINT("mlt_size",q->mlt_size);
1142     PRINT("js_subband_start",q->js_subband_start);
1143     PRINT("log2_numvector_size",q->log2_numvector_size);
1144     PRINT("numvector_size",q->numvector_size);
1145     PRINT("total_subbands",q->total_subbands);
1146 }
1147 #endif
1148
1149 /**
1150  * Cook initialization
1151  *
1152  * @param avctx     pointer to the AVCodecContext
1153  */
1154
1155 static int cook_decode_init(AVCodecContext *avctx)
1156 {
1157     COOKextradata *e = avctx->extradata;
1158     COOKContext *q = avctx->priv_data;
1159
1160     /* Take care of the codec specific extradata. */
1161     if (avctx->extradata_size <= 0) {
1162         av_log(NULL,AV_LOG_ERROR,"Necessary extradata missing!\n");
1163         return -1;
1164     } else {
1165         /* 8 for mono, 16 for stereo, ? for multichannel
1166            Swap to right endianness so we don't need to care later on. */
1167         av_log(NULL,AV_LOG_DEBUG,"codecdata_length=%d\n",avctx->extradata_size);
1168         if (avctx->extradata_size >= 8){
1169             e->cookversion = be2me_32(e->cookversion);
1170             e->samples_per_frame = be2me_16(e->samples_per_frame);
1171             e->subbands = be2me_16(e->subbands);
1172         }
1173         if (avctx->extradata_size >= 16){
1174             e->js_subband_start = be2me_16(e->js_subband_start);
1175             e->js_vlc_bits = be2me_16(e->js_vlc_bits);
1176         }
1177     }
1178
1179     /* Take data from the AVCodecContext (RM container). */
1180     q->sample_rate = avctx->sample_rate;
1181     q->nb_channels = avctx->channels;
1182     q->bit_rate = avctx->bit_rate;
1183
1184     /* Initialize state. */
1185     q->random_state = 1;
1186
1187     /* Initialize extradata related variables. */
1188     q->samples_per_channel = e->samples_per_frame / q->nb_channels;
1189     q->samples_per_frame = e->samples_per_frame;
1190     q->subbands = e->subbands;
1191     q->bits_per_subpacket = avctx->block_align * 8;
1192
1193     /* Initialize default data states. */
1194     q->js_subband_start = 0;
1195     q->log2_numvector_size = 5;
1196     q->total_subbands = q->subbands;
1197
1198     /* Initialize version-dependent variables */
1199     av_log(NULL,AV_LOG_DEBUG,"e->cookversion=%x\n",e->cookversion);
1200     switch (e->cookversion) {
1201         case MONO_COOK1:
1202             if (q->nb_channels != 1) {
1203                 av_log(NULL,AV_LOG_ERROR,"Container channels != 1, report sample!\n");
1204                 return -1;
1205             }
1206             av_log(NULL,AV_LOG_DEBUG,"MONO_COOK1\n");
1207             break;
1208         case MONO_COOK2:
1209             if (q->nb_channels != 1) {
1210                 q->joint_stereo = 0;
1211                 q->bits_per_subpacket = q->bits_per_subpacket/2;
1212             }
1213             av_log(NULL,AV_LOG_DEBUG,"MONO_COOK2\n");
1214             break;
1215         case JOINT_STEREO:
1216             if (q->nb_channels != 2) {
1217                 av_log(NULL,AV_LOG_ERROR,"Container channels != 2, report sample!\n");
1218                 return -1;
1219             }
1220             av_log(NULL,AV_LOG_DEBUG,"JOINT_STEREO\n");
1221             if (avctx->extradata_size >= 16){
1222                 q->total_subbands = q->subbands + e->js_subband_start;
1223                 q->js_subband_start = e->js_subband_start;
1224                 q->joint_stereo = 1;
1225                 q->js_vlc_bits = e->js_vlc_bits;
1226             }
1227             if (q->samples_per_channel > 256) {
1228                 q->log2_numvector_size  = 6;
1229             }
1230             if (q->samples_per_channel > 512) {
1231                 q->log2_numvector_size  = 7;
1232             }
1233             break;
1234         case MC_COOK:
1235             av_log(NULL,AV_LOG_ERROR,"MC_COOK not supported!\n");
1236             return -1;
1237             break;
1238         default:
1239             av_log(NULL,AV_LOG_ERROR,"Unknown Cook version, report sample!\n");
1240             return -1;
1241             break;
1242     }
1243
1244     /* Initialize variable relations */
1245     q->mlt_size = q->samples_per_channel;
1246     q->numvector_size = (1 << q->log2_numvector_size);
1247
1248     /* Generate tables */
1249     init_rootpow2table(q);
1250     init_pow2table(q);
1251     init_gain_table(q);
1252
1253     if (init_cook_vlc_tables(q) != 0)
1254         return -1;
1255
1256     /* Pad the databuffer with FF_INPUT_BUFFER_PADDING_SIZE,
1257        this is for the bitstreamreader. */
1258     if ((q->decoded_bytes_buffer = av_mallocz((avctx->block_align+(4-avctx->block_align%4) + FF_INPUT_BUFFER_PADDING_SIZE)*sizeof(uint8_t)))  == NULL)
1259         return -1;
1260
1261     q->decode_buf_ptr[0] = q->decode_buffer_1;
1262     q->decode_buf_ptr[1] = q->decode_buffer_2;
1263     q->decode_buf_ptr[2] = q->decode_buffer_3;
1264     q->decode_buf_ptr[3] = q->decode_buffer_4;
1265
1266     q->decode_buf_ptr2[0] = q->decode_buffer_3;
1267     q->decode_buf_ptr2[1] = q->decode_buffer_4;
1268
1269     q->previous_buffer_ptr[0] = q->mono_previous_buffer1;
1270     q->previous_buffer_ptr[1] = q->mono_previous_buffer2;
1271
1272     /* Initialize transform. */
1273     if ( init_cook_mlt(q) == 0 )
1274         return -1;
1275
1276     /* Try to catch some obviously faulty streams, othervise it might be exploitable */
1277     if (q->total_subbands > 53) {
1278         av_log(NULL,AV_LOG_ERROR,"total_subbands > 53, report sample!\n");
1279         return -1;
1280     }
1281     if (q->subbands > 50) {
1282         av_log(NULL,AV_LOG_ERROR,"subbands > 50, report sample!\n");
1283         return -1;
1284     }
1285     if ((q->samples_per_channel == 256) || (q->samples_per_channel == 512) || (q->samples_per_channel == 1024)) {
1286     } else {
1287         av_log(NULL,AV_LOG_ERROR,"unknown amount of samples_per_channel = %d, report sample!\n",q->samples_per_channel);
1288         return -1;
1289     }
1290
1291 #ifdef COOKDEBUG
1292     dump_cook_context(q,e);
1293 #endif
1294     return 0;
1295 }
1296
1297
1298 AVCodec cook_decoder =
1299 {
1300     .name = "cook",
1301     .type = CODEC_TYPE_AUDIO,
1302     .id = CODEC_ID_COOK,
1303     .priv_data_size = sizeof(COOKContext),
1304     .init = cook_decode_init,
1305     .close = cook_decode_close,
1306     .decode = cook_decode_frame,
1307 };