git.sesse.net Git - ffmpeg/blob - libavcodec/cook.c

   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 #include "avcodec.h"
  49 #include "bitstream.h"
  50 #include "dsputil.h"
  51
  52 #include "cookdata.h"
  53
  54 /* the different Cook versions */
  55 #define MONO_COOK1      0x1000001
  56 #define MONO_COOK2      0x1000002
  57 #define JOINT_STEREO    0x1000003
  58 #define MC_COOK         0x2000000   //multichannel Cook, not supported
  59
  60 #define SUBBAND_SIZE    20
  61 //#define COOKDEBUG
  62
  63 typedef struct {
  64     int     size;
  65     int     qidx_table1[8];
  66     int     qidx_table2[8];
  67 } COOKgain;
  68
  69 typedef struct __attribute__((__packed__)){
  70     /* codec data start */
  71     uint32_t cookversion;               //in network order, bigendian
  72     uint16_t samples_per_frame;         //amount of samples per frame per channel, bigendian
  73     uint16_t subbands;                  //amount of bands used in the frequency domain, bigendian
  74     /* Mono extradata ends here. */
  75     uint32_t unused;
  76     uint16_t js_subband_start;          //bigendian
  77     uint16_t js_vlc_bits;               //bigendian
  78     /* Stereo extradata ends here. */
  79 } COOKextradata;
  80
  81
  82 typedef struct {
  83     GetBitContext       gb;
  84     /* stream data */
  85     int                 nb_channels;
  86     int                 joint_stereo;
  87     int                 bit_rate;
  88     int                 sample_rate;
  89     int                 samples_per_channel;
  90     int                 samples_per_frame;
  91     int                 subbands;
  92     int                 log2_numvector_size;
  93     int                 numvector_size;                //1 << log2_numvector_size;
  94     int                 js_subband_start;
  95     int                 total_subbands;
  96     int                 num_vectors;
  97     int                 bits_per_subpacket;
  98     /* states */
  99     int                 random_state;
 100
 101     /* transform data */
 102     FFTContext          fft_ctx;
 103     FFTSample           mlt_tmp[1024] __attribute__((aligned(16))); /* temporary storage for imlt */
 104     float*              mlt_window;
 105     float*              mlt_precos;
 106     float*              mlt_presin;
 107     float*              mlt_postcos;
 108     int                 fft_size;
 109     int                 fft_order;
 110     int                 mlt_size;       //modulated lapped transform size
 111
 112     /* gain buffers */
 113     COOKgain*           gain_now_ptr;
 114     COOKgain*           gain_previous_ptr;
 115     COOKgain            gain_current;
 116     COOKgain            gain_now;
 117     COOKgain            gain_previous;
 118     COOKgain            gain_channel1[2];
 119     COOKgain            gain_channel2[2];
 120
 121     /* VLC data */
 122     int                 js_vlc_bits;
 123     VLC                 envelope_quant_index[13];
 124     VLC                 sqvh[7];          //scalar quantization
 125     VLC                 ccpl;             //channel coupling
 126
 127     /* generatable tables and related variables */
 128     int                 gain_size_factor;
 129     float               gain_table[23];
 130     float               pow2tab[127];
 131     float               rootpow2tab[127];
 132
 133     /* data buffers */
 134
 135     uint8_t*            decoded_bytes_buffer;
 136     float               mono_mdct_output[2048] __attribute__((aligned(16)));
 137     float*              previous_buffer_ptr[2];
 138     float               mono_previous_buffer1[1024];
 139     float               mono_previous_buffer2[1024];
 140     float*              decode_buf_ptr[4];
 141     float*              decode_buf_ptr2[2];
 142     float               decode_buffer_1[1024];
 143     float               decode_buffer_2[1024];
 144     float               decode_buffer_3[1024];
 145     float               decode_buffer_4[1024];
 146 } COOKContext;
 147
 148 /* debug functions */
 149
 150 #ifdef COOKDEBUG
 151 static void dump_float_table(float* table, int size, int delimiter) {
 152     int i=0;
 153     av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
 154     for (i=0 ; i<size ; i++) {
 155         av_log(NULL, AV_LOG_ERROR, "%5.1f, ", table[i]);
 156         if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
 157     }
 158 }
 159
 160 static void dump_int_table(int* table, int size, int delimiter) {
 161     int i=0;
 162     av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
 163     for (i=0 ; i<size ; i++) {
 164         av_log(NULL, AV_LOG_ERROR, "%d, ", table[i]);
 165         if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
 166     }
 167 }
 168
 169 static void dump_short_table(short* table, int size, int delimiter) {
 170     int i=0;
 171     av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
 172     for (i=0 ; i<size ; i++) {
 173         av_log(NULL, AV_LOG_ERROR, "%d, ", table[i]);
 174         if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
 175     }
 176 }
 177
 178 #endif
 179
 180 /*************** init functions ***************/
 181
 182 /* table generator */
 183 static void init_pow2table(COOKContext *q){
 184     int i;
 185     q->pow2tab[63] = 1.0;
 186     for (i=1 ; i<64 ; i++){
 187         q->pow2tab[63+i]=(float)((uint64_t)1<<i);
 188         q->pow2tab[63-i]=1.0/(float)((uint64_t)1<<i);
 189     }
 190 }
 191
 192 /* table generator */
 193 static void init_rootpow2table(COOKContext *q){
 194     int i;
 195     q->rootpow2tab[63] = 1.0;
 196     for (i=1 ; i<64 ; i++){
 197         q->rootpow2tab[63+i]=sqrt((float)((uint64_t)1<<i));
 198         q->rootpow2tab[63-i]=sqrt(1.0/(float)((uint64_t)1<<i));
 199     }
 200 }
 201
 202 /* table generator */
 203 static void init_gain_table(COOKContext *q) {
 204     int i;
 205     q->gain_size_factor = q->samples_per_channel/8;
 206     for (i=0 ; i<23 ; i++) {
 207         q->gain_table[i] = pow((double)q->pow2tab[i+52] ,
 208                                (1.0/(double)q->gain_size_factor));
 209     }
 210 }
 211
 212
 213 static int init_cook_vlc_tables(COOKContext *q) {
 214     int i, result;
 215
 216     result = 0;
 217     for (i=0 ; i<13 ; i++) {
 218         result &= init_vlc (&q->envelope_quant_index[i], 9, 24,
 219             envelope_quant_index_huffbits[i], 1, 1,
 220             envelope_quant_index_huffcodes[i], 2, 2, 0);
 221     }
 222     av_log(NULL,AV_LOG_DEBUG,"sqvh VLC init\n");
 223     for (i=0 ; i<7 ; i++) {
 224         result &= init_vlc (&q->sqvh[i], vhvlcsize_tab[i], vhsize_tab[i],
 225             cvh_huffbits[i], 1, 1,
 226             cvh_huffcodes[i], 2, 2, 0);
 227     }
 228
 229     if (q->nb_channels==2 && q->joint_stereo==1){
 230         result &= init_vlc (&q->ccpl, 6, (1<<q->js_vlc_bits)-1,
 231             ccpl_huffbits[q->js_vlc_bits-2], 1, 1,
 232             ccpl_huffcodes[q->js_vlc_bits-2], 2, 2, 0);
 233         av_log(NULL,AV_LOG_DEBUG,"Joint-stereo VLC used.\n");
 234     }
 235
 236     av_log(NULL,AV_LOG_DEBUG,"VLC tables initialized.\n");
 237     return result;
 238 }
 239
 240 static int init_cook_mlt(COOKContext *q) {
 241     int j;
 242     float alpha;
 243
 244     /* Allocate the buffers, could be replaced with a static [512]
 245        array if needed. */
 246     q->mlt_size = q->samples_per_channel;
 247     q->mlt_window = av_malloc(sizeof(float)*q->mlt_size);
 248     q->mlt_precos = av_malloc(sizeof(float)*q->mlt_size/2);
 249     q->mlt_presin = av_malloc(sizeof(float)*q->mlt_size/2);
 250     q->mlt_postcos = av_malloc(sizeof(float)*q->mlt_size/2);
 251
 252     /* Initialize the MLT window: simple sine window. */
 253     alpha = M_PI / (2.0 * (float)q->mlt_size);
 254     for(j=0 ; j<q->mlt_size ; j++) {
 255         q->mlt_window[j] = sin((j + 512.0/(float)q->mlt_size) * alpha);
 256     }
 257
 258     /* pre/post twiddle factors */
 259     for (j=0 ; j<q->mlt_size/2 ; j++){
 260         q->mlt_precos[j] = cos( ((j+0.25)*M_PI)/q->mlt_size);
 261         q->mlt_presin[j] = sin( ((j+0.25)*M_PI)/q->mlt_size);
 262         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
 263     }
 264
 265     /* Initialize the FFT. */
 266     ff_fft_init(&q->fft_ctx, av_log2(q->mlt_size)-1, 0);
 267     av_log(NULL,AV_LOG_DEBUG,"FFT initialized, order = %d.\n",
 268            av_log2(q->samples_per_channel)-1);
 269
 270     return (int)(q->mlt_window && q->mlt_precos && q->mlt_presin && q->mlt_postcos);
 271 }
 272
 273 /*************** init functions end ***********/
 274
 275 /**
 276  * Cook indata decoding, every 32 bits are XORed with 0x37c511f2.
 277  * Why? No idea, some checksum/error detection method maybe.
 278  * Nice way to waste CPU cycles.
 279  *
 280  * @param in        pointer to 32bit array of indata
 281  * @param bits      amount of bits
 282  * @param out       pointer to 32bit array of outdata
 283  */
 284
 285 static inline void decode_bytes(uint8_t* inbuffer, uint8_t* out, int bytes){
 286     int i;
 287     uint32_t* buf = (uint32_t*) inbuffer;
 288     uint32_t* obuf = (uint32_t*) out;
 289     /* FIXME: 64 bit platforms would be able to do 64 bits at a time.
 290      * I'm too lazy though, should be something like
 291      * for(i=0 ; i<bitamount/64 ; i++)
 292      *     (int64_t)out[i] = 0x37c511f237c511f2^be2me_64(int64_t)in[i]);
 293      * Buffer alignment needs to be checked. */
 294
 295
 296     for(i=0 ; i<bytes/4 ; i++){
 297 #ifdef WORDS_BIGENDIAN
 298         obuf[i] = 0x37c511f2^buf[i];
 299 #else
 300         obuf[i] = 0xf211c537^buf[i];
 301 #endif
 302     }
 303 }
 304
 305 /**
 306  * Cook uninit
 307  */
 308
 309 static int cook_decode_close(AVCodecContext *avctx)
 310 {
 311     int i;
 312     COOKContext *q = avctx->priv_data;
 313     av_log(NULL,AV_LOG_DEBUG, "Deallocating memory.\n");
 314
 315     /* Free allocated memory buffers. */
 316     av_free(q->mlt_window);
 317     av_free(q->mlt_precos);
 318     av_free(q->mlt_presin);
 319     av_free(q->mlt_postcos);
 320     av_free(q->decoded_bytes_buffer);
 321
 322     /* Free the transform. */
 323     ff_fft_end(&q->fft_ctx);
 324
 325     /* Free the VLC tables. */
 326     for (i=0 ; i<13 ; i++) {
 327         free_vlc(&q->envelope_quant_index[i]);
 328     }
 329     for (i=0 ; i<7 ; i++) {
 330         free_vlc(&q->sqvh[i]);
 331     }
 332     if(q->nb_channels==2 && q->joint_stereo==1 ){
 333         free_vlc(&q->ccpl);
 334     }
 335
 336     av_log(NULL,AV_LOG_DEBUG,"Memory deallocated.\n");
 337
 338     return 0;
 339 }
 340
 341 /**
 342  * Fill the COOKgain structure for the timedomain quantization.
 343  *
 344  * @param q                 pointer to the COOKContext
 345  * @param gaininfo          pointer to the COOKgain
 346  */
 347
 348 static void decode_gain_info(GetBitContext *gb, COOKgain* gaininfo) {
 349     int i;
 350
 351     while (get_bits1(gb)) {}
 352
 353     gaininfo->size = get_bits_count(gb) - 1;     //amount of elements*2 to update
 354
 355     if (get_bits_count(gb) - 1 <= 0) return;
 356
 357     for (i=0 ; i<gaininfo->size ; i++){
 358         gaininfo->qidx_table1[i] = get_bits(gb,3);
 359         if (get_bits1(gb)) {
 360             gaininfo->qidx_table2[i] = get_bits(gb,4) - 7;  //convert to signed
 361         } else {
 362             gaininfo->qidx_table2[i] = -1;
 363         }
 364     }
 365 }
 366
 367 /**
 368  * Create the quant index table needed for the envelope.
 369  *
 370  * @param q                 pointer to the COOKContext
 371  * @param quant_index_table pointer to the array
 372  */
 373
 374 static void decode_envelope(COOKContext *q, int* quant_index_table) {
 375     int i,j, vlc_index;
 376     int bitbias;
 377
 378     bitbias = get_bits_count(&q->gb);
 379     quant_index_table[0]= get_bits(&q->gb,6) - 6;       //This is used later in categorize
 380
 381     for (i=1 ; i < q->total_subbands ; i++){
 382         vlc_index=i;
 383         if (i >= q->js_subband_start * 2) {
 384             vlc_index-=q->js_subband_start;
 385         } else {
 386             vlc_index/=2;
 387             if(vlc_index < 1) vlc_index = 1;
 388         }
 389         if (vlc_index>13) vlc_index = 13;           //the VLC tables >13 are identical to No. 13
 390
 391         j = get_vlc2(&q->gb, q->envelope_quant_index[vlc_index-1].table,
 392                      q->envelope_quant_index[vlc_index-1].bits,2);
 393         quant_index_table[i] = quant_index_table[i-1] + j - 12;    //differential encoding
 394     }
 395 }
 396
 397 /**
 398  * Create the quant value table.
 399  *
 400  * @param q                 pointer to the COOKContext
 401  * @param quant_value_table pointer to the array
 402  */
 403
 404 static void inline dequant_envelope(COOKContext *q, int* quant_index_table,
 405                                     float* quant_value_table){
 406
 407     int i;
 408     for(i=0 ; i < q->total_subbands ; i++){
 409         quant_value_table[i] = q->rootpow2tab[quant_index_table[i]+63];
 410     }
 411 }
 412
 413 /**
 414  * Calculate the category and category_index vector.
 415  *
 416  * @param q                     pointer to the COOKContext
 417  * @param quant_index_table     pointer to the array
 418  * @param category              pointer to the category array
 419  * @param category_index        pointer to the category_index array
 420  */
 421
 422 static void categorize(COOKContext *q, int* quant_index_table,
 423                        int* category, int* category_index){
 424     int exp_idx, bias, tmpbias, bits_left, num_bits, index, v, i, j;
 425     int exp_index2[102];
 426     int exp_index1[102];
 427
 428     int tmp_categorize_array1[128];
 429     int tmp_categorize_array1_idx=0;
 430     int tmp_categorize_array2[128];
 431     int tmp_categorize_array2_idx=0;
 432     int category_index_size=0;
 433
 434     bits_left =  q->bits_per_subpacket - get_bits_count(&q->gb);
 435
 436     if(bits_left > q->samples_per_channel) {
 437         bits_left = q->samples_per_channel +
 438                     ((bits_left - q->samples_per_channel)*5)/8;
 439         //av_log(NULL, AV_LOG_ERROR, "bits_left = %d\n",bits_left);
 440     }
 441
 442     memset(&exp_index1,0,102*sizeof(int));
 443     memset(&exp_index2,0,102*sizeof(int));
 444     memset(&tmp_categorize_array1,0,128*sizeof(int));
 445     memset(&tmp_categorize_array2,0,128*sizeof(int));
 446
 447     bias=-32;
 448
 449     /* Estimate bias. */
 450     for (i=32 ; i>0 ; i=i/2){
 451         num_bits = 0;
 452         index = 0;
 453         for (j=q->total_subbands ; j>0 ; j--){
 454             exp_idx = (i - quant_index_table[index] + bias) / 2;
 455             if (exp_idx<0){
 456                 exp_idx=0;
 457             } else if(exp_idx >7) {
 458                 exp_idx=7;
 459             }
 460             index++;
 461             num_bits+=expbits_tab[exp_idx];
 462         }
 463         if(num_bits >= bits_left - 32){
 464             bias+=i;
 465         }
 466     }
 467
 468     /* Calculate total number of bits. */
 469     num_bits=0;
 470     for (i=0 ; i<q->total_subbands ; i++) {
 471         exp_idx = (bias - quant_index_table[i]) / 2;
 472         if (exp_idx<0) {
 473             exp_idx=0;
 474         } else if(exp_idx >7) {
 475             exp_idx=7;
 476         }
 477         num_bits += expbits_tab[exp_idx];
 478         exp_index1[i] = exp_idx;
 479         exp_index2[i] = exp_idx;
 480     }
 481     tmpbias = bias = num_bits;
 482
 483     for (j = 1 ; j < q->numvector_size ; j++) {
 484         if (tmpbias + bias > 2*bits_left) {  /* ---> */
 485             int max = -999999;
 486             index=-1;
 487             for (i=0 ; i<q->total_subbands ; i++){
 488                 if (exp_index1[i] < 7) {
 489                     v = (-2*exp_index1[i]) - quant_index_table[i] - 32;
 490                     if ( v >= max) {
 491                         max = v;
 492                         index = i;
 493                     }
 494                 }
 495             }
 496             if(index==-1)break;
 497             tmp_categorize_array1[tmp_categorize_array1_idx++] = index;
 498             tmpbias -= expbits_tab[exp_index1[index]] -
 499                        expbits_tab[exp_index1[index]+1];
 500             ++exp_index1[index];
 501         } else {  /* <--- */
 502             int min = 999999;
 503             index=-1;
 504             for (i=0 ; i<q->total_subbands ; i++){
 505                 if(exp_index2[i] > 0){
 506                     v = (-2*exp_index2[i])-quant_index_table[i];
 507                     if ( v < min) {
 508                         min = v;
 509                         index = i;
 510                     }
 511                 }
 512             }
 513             if(index == -1)break;
 514             tmp_categorize_array2[tmp_categorize_array2_idx++] = index;
 515             tmpbias -= expbits_tab[exp_index2[index]] -
 516                        expbits_tab[exp_index2[index]-1];
 517             --exp_index2[index];
 518         }
 519     }
 520
 521     for(i=0 ; i<q->total_subbands ; i++)
 522         category[i] = exp_index2[i];
 523
 524     /* Concatenate the two arrays. */
 525     for(i=tmp_categorize_array2_idx-1 ; i >= 0; i--)
 526         category_index[category_index_size++] =  tmp_categorize_array2[i];
 527
 528     for(i=0;i<tmp_categorize_array1_idx;i++)
 529         category_index[category_index_size++ ] =  tmp_categorize_array1[i];
 530
 531     /* FIXME: mc_sich_ra8_20.rm triggers this, not sure with what we
 532        should fill the remaining bytes. */
 533     for(i=category_index_size;i<q->numvector_size;i++)
 534         category_index[i]=0;
 535
 536 }
 537
 538
 539 /**
 540  * Expand the category vector.
 541  *
 542  * @param q                     pointer to the COOKContext
 543  * @param category              pointer to the category array
 544  * @param category_index        pointer to the category_index array
 545  */
 546
 547 static void inline expand_category(COOKContext *q, int* category,
 548                                    int* category_index){
 549     int i;
 550     for(i=0 ; i<q->num_vectors ; i++){
 551         ++category[category_index[i]];
 552     }
 553 }
 554
 555 /**
 556  * The real requantization of the mltcoefs
 557  *
 558  * @param q                     pointer to the COOKContext
 559  * @param index                 index
 560  * @param band                  current subband
 561  * @param quant_value_table     pointer to the array
 562  * @param subband_coef_index    array of indexes to quant_centroid_tab
 563  * @param subband_coef_noise    use random noise instead of predetermined value
 564  * @param mlt_buffer            pointer to the mlt buffer
 565  */
 566
 567
 568 static void scalar_dequant(COOKContext *q, int index, int band,
 569                            float* quant_value_table, int* subband_coef_index,
 570                            int* subband_coef_noise, float* mlt_buffer){
 571     int i;
 572     float f1;
 573
 574     for(i=0 ; i<SUBBAND_SIZE ; i++) {
 575         if (subband_coef_index[i]) {
 576             if (subband_coef_noise[i]) {
 577                 f1 = -quant_centroid_tab[index][subband_coef_index[i]];
 578             } else {
 579                 f1 = quant_centroid_tab[index][subband_coef_index[i]];
 580             }
 581         } else {
 582             /* noise coding if subband_coef_noise[i] == 0 */
 583             q->random_state = q->random_state * 214013 + 2531011;    //typical RNG numbers
 584             f1 = randsign[(q->random_state/0x1000000)&1] * dither_tab[index]; //>>31
 585         }
 586         mlt_buffer[band*20+ i] = f1 * quant_value_table[band];
 587     }
 588 }
 589 /**
 590  * Unpack the subband_coef_index and subband_coef_noise vectors.
 591  *
 592  * @param q                     pointer to the COOKContext
 593  * @param category              pointer to the category array
 594  * @param subband_coef_index    array of indexes to quant_centroid_tab
 595  * @param subband_coef_noise    use random noise instead of predetermined value
 596  */
 597
 598 static int unpack_SQVH(COOKContext *q, int category, int* subband_coef_index,
 599                        int* subband_coef_noise) {
 600     int i,j;
 601     int vlc, vd ,tmp, result;
 602     int ub;
 603     int cb;
 604
 605     vd = vd_tab[category];
 606     result = 0;
 607     for(i=0 ; i<vpr_tab[category] ; i++){
 608         ub = get_bits_count(&q->gb);
 609         vlc = get_vlc2(&q->gb, q->sqvh[category].table, q->sqvh[category].bits, 3);
 610         cb = get_bits_count(&q->gb);
 611         if (q->bits_per_subpacket < get_bits_count(&q->gb)){
 612             vlc = 0;
 613             result = 1;
 614         }
 615         for(j=vd-1 ; j>=0 ; j--){
 616             tmp = (vlc * invradix_tab[category])/0x100000;
 617             subband_coef_index[vd*i+j] = vlc - tmp * (kmax_tab[category]+1);
 618             vlc = tmp;
 619         }
 620         for(j=0 ; j<vd ; j++){
 621             if (subband_coef_index[i*vd + j]) {
 622                 if(get_bits_count(&q->gb) < q->bits_per_subpacket){
 623                     subband_coef_noise[i*vd+j] = get_bits1(&q->gb);
 624                 } else {
 625                     result=1;
 626                     subband_coef_noise[i*vd+j]=0;
 627                 }
 628             } else {
 629                 subband_coef_noise[i*vd+j]=0;
 630             }
 631         }
 632     }
 633     return result;
 634 }
 635
 636
 637 /**
 638  * Fill the mlt_buffer with mlt coefficients.
 639  *
 640  * @param q                 pointer to the COOKContext
 641  * @param category          pointer to the category array
 642  * @param quant_value_table pointer to the array
 643  * @param mlt_buffer        pointer to mlt coefficients
 644  */
 645
 646
 647 static void decode_vectors(COOKContext* q, int* category,
 648                            float* quant_value_table, float* mlt_buffer){
 649     /* A zero in this table means that the subband coefficient is
 650        random noise coded. */
 651     int subband_coef_noise[SUBBAND_SIZE];
 652     /* A zero in this table means that the subband coefficient is a
 653        positive multiplicator. */
 654     int subband_coef_index[SUBBAND_SIZE];
 655     int band, j;
 656     int index=0;
 657
 658     for(band=0 ; band<q->total_subbands ; band++){
 659         index = category[band];
 660         if(category[band] < 7){
 661             if(unpack_SQVH(q, category[band], subband_coef_index, subband_coef_noise)){
 662                 index=7;
 663                 for(j=0 ; j<q->total_subbands ; j++) category[band+j]=7;
 664             }
 665         }
 666         if(index==7) {
 667             memset(subband_coef_index, 0, sizeof(subband_coef_index));
 668             memset(subband_coef_noise, 0, sizeof(subband_coef_noise));
 669         }
 670         scalar_dequant(q, index, band, quant_value_table, subband_coef_index,
 671                        subband_coef_noise, mlt_buffer);
 672     }
 673
 674     if(q->total_subbands*SUBBAND_SIZE >= q->samples_per_channel){
 675         return;
 676     }
 677 }
 678
 679
 680 /**
 681  * function for decoding mono data
 682  *
 683  * @param q                 pointer to the COOKContext
 684  * @param mlt_buffer1       pointer to left channel mlt coefficients
 685  * @param mlt_buffer2       pointer to right channel mlt coefficients
 686  */
 687
 688 static void mono_decode(COOKContext *q, float* mlt_buffer) {
 689
 690     int category_index[128];
 691     float quant_value_table[102];
 692     int quant_index_table[102];
 693     int category[128];
 694
 695     memset(&category, 0, 128*sizeof(int));
 696     memset(&quant_value_table, 0, 102*sizeof(int));
 697     memset(&category_index, 0, 128*sizeof(int));
 698
 699     decode_envelope(q, quant_index_table);
 700     q->num_vectors = get_bits(&q->gb,q->log2_numvector_size);
 701     dequant_envelope(q, quant_index_table, quant_value_table);
 702     categorize(q, quant_index_table, category, category_index);
 703     expand_category(q, category, category_index);
 704     decode_vectors(q, category, quant_value_table, mlt_buffer);
 705 }
 706
 707
 708 /**
 709  * The modulated lapped transform, this takes transform coefficients
 710  * and transforms them into timedomain samples. This is done through
 711  * an FFT-based algorithm with pre- and postrotation steps.
 712  * A window and reorder step is also included.
 713  *
 714  * @param q                 pointer to the COOKContext
 715  * @param inbuffer          pointer to the mltcoefficients
 716  * @param outbuffer         pointer to the timedomain buffer
 717  * @param mlt_tmp           pointer to temporary storage space
 718  */
 719
 720 static void cook_imlt(COOKContext *q, float* inbuffer, float* outbuffer,
 721                       float* mlt_tmp){
 722     int i;
 723
 724     /* prerotation */
 725     for(i=0 ; i<q->mlt_size ; i+=2){
 726         outbuffer[i] = (q->mlt_presin[i/2] * inbuffer[q->mlt_size-1-i]) +
 727                        (q->mlt_precos[i/2] * inbuffer[i]);
 728         outbuffer[i+1] = (q->mlt_precos[i/2] * inbuffer[q->mlt_size-1-i]) -
 729                          (q->mlt_presin[i/2] * inbuffer[i]);
 730     }
 731
 732     /* FFT */
 733     ff_fft_permute(&q->fft_ctx, (FFTComplex *) outbuffer);
 734     ff_fft_calc (&q->fft_ctx, (FFTComplex *) outbuffer);
 735
 736     /* postrotation */
 737     for(i=0 ; i<q->mlt_size ; i+=2){
 738         mlt_tmp[i] =               (q->mlt_postcos[(q->mlt_size-1-i)/2] * outbuffer[i+1]) +
 739                                    (q->mlt_postcos[i/2] * outbuffer[i]);
 740         mlt_tmp[q->mlt_size-1-i] = (q->mlt_postcos[(q->mlt_size-1-i)/2] * outbuffer[i]) -
 741                                    (q->mlt_postcos[i/2] * outbuffer[i+1]);
 742     }
 743
 744     /* window and reorder */
 745     for(i=0 ; i<q->mlt_size/2 ; i++){
 746         outbuffer[i] = mlt_tmp[q->mlt_size/2-1-i] * q->mlt_window[i];
 747         outbuffer[q->mlt_size-1-i]= mlt_tmp[q->mlt_size/2-1-i] *
 748                                     q->mlt_window[q->mlt_size-1-i];
 749         outbuffer[q->mlt_size+i]= mlt_tmp[q->mlt_size/2+i] *
 750                                   q->mlt_window[q->mlt_size-1-i];
 751         outbuffer[2*q->mlt_size-1-i]= -(mlt_tmp[q->mlt_size/2+i] *
 752                                       q->mlt_window[i]);
 753     }
 754 }
 755
 756
 757 /**
 758  * the actual requantization of the timedomain samples
 759  *
 760  * @param q                 pointer to the COOKContext
 761  * @param buffer            pointer to the timedomain buffer
 762  * @param gain_index        index for the block multiplier
 763  * @param gain_index_next   index for the next block multiplier
 764  */
 765
 766 static void interpolate(COOKContext *q, float* buffer,
 767                         int gain_index, int gain_index_next){
 768     int i;
 769     float fc1, fc2;
 770     fc1 = q->pow2tab[gain_index+63];
 771
 772     if(gain_index == gain_index_next){              //static gain
 773         for(i=0 ; i<q->gain_size_factor ; i++){
 774             buffer[i]*=fc1;
 775         }
 776         return;
 777     } else {                                        //smooth gain
 778         fc2 = q->gain_table[11 + (gain_index_next-gain_index)];
 779         for(i=0 ; i<q->gain_size_factor ; i++){
 780             buffer[i]*=fc1;
 781             fc1*=fc2;
 782         }
 783         return;
 784     }
 785 }
 786
 787 /**
 788  * timedomain requantization of the timedomain samples
 789  *
 790  * @param q                 pointer to the COOKContext
 791  * @param buffer            pointer to the timedomain buffer
 792  * @param gain_now          current gain structure
 793  * @param gain_previous     previous gain structure
 794  */
 795
 796 static void gain_window(COOKContext *q, float* buffer, COOKgain* gain_now,
 797                         COOKgain* gain_previous){
 798     int i, index;
 799     int gain_index[9];
 800     int tmp_gain_index;
 801
 802     gain_index[8]=0;
 803     index = gain_previous->size;
 804     for (i=7 ; i>=0 ; i--) {
 805         if(index && gain_previous->qidx_table1[index-1]==i) {
 806             gain_index[i] = gain_previous->qidx_table2[index-1];
 807             index--;
 808         } else {
 809             gain_index[i]=gain_index[i+1];
 810         }
 811     }
 812     /* This is applied to the to be previous data buffer. */
 813     for(i=0;i<8;i++){
 814         interpolate(q, &buffer[q->samples_per_channel+q->gain_size_factor*i],
 815                     gain_index[i], gain_index[i+1]);
 816     }
 817
 818     tmp_gain_index = gain_index[0];
 819     index = gain_now->size;
 820     for (i=7 ; i>=0 ; i--) {
 821         if(index && gain_now->qidx_table1[index-1]==i) {
 822             gain_index[i]= gain_now->qidx_table2[index-1];
 823             index--;
 824         } else {
 825             gain_index[i]=gain_index[i+1];
 826         }
 827     }
 828
 829     /* This is applied to the to be current block. */
 830     for(i=0;i<8;i++){
 831         interpolate(q, &buffer[i*q->gain_size_factor],
 832                     tmp_gain_index+gain_index[i],
 833                     tmp_gain_index+gain_index[i+1]);
 834     }
 835 }
 836
 837
 838 /**
 839  * mlt overlapping and buffer management
 840  *
 841  * @param q                 pointer to the COOKContext
 842  * @param buffer            pointer to the timedomain buffer
 843  * @param gain_now          current gain structure
 844  * @param gain_previous     previous gain structure
 845  * @param previous_buffer   pointer to the previous buffer to be used for overlapping
 846  *
 847  */
 848
 849 static void gain_compensate(COOKContext *q, float* buffer, COOKgain* gain_now,
 850                             COOKgain* gain_previous, float* previous_buffer) {
 851     int i;
 852     if((gain_now->size  || gain_previous->size)) {
 853         gain_window(q, buffer, gain_now, gain_previous);
 854     }
 855
 856     /* Overlap with the previous block. */
 857     for(i=0 ; i<q->samples_per_channel ; i++) buffer[i]+=previous_buffer[i];
 858
 859     /* Save away the current to be previous block. */
 860     memcpy(previous_buffer, buffer+q->samples_per_channel,
 861            sizeof(float)*q->samples_per_channel);
 862 }
 863
 864
 865 /**
 866  * function for getting the jointstereo coupling information
 867  *
 868  * @param q                 pointer to the COOKContext
 869  * @param decouple_tab      decoupling array
 870  *
 871  */
 872
 873 static void decouple_info(COOKContext *q, int* decouple_tab){
 874     int length, i;
 875
 876     if(get_bits1(&q->gb)) {
 877         if(cplband[q->js_subband_start] > cplband[q->subbands-1]) return;
 878
 879         length = cplband[q->subbands-1] - cplband[q->js_subband_start] + 1;
 880         for (i=0 ; i<length ; i++) {
 881             decouple_tab[cplband[q->js_subband_start] + i] = get_vlc2(&q->gb, q->ccpl.table, q->ccpl.bits, 2);
 882         }
 883         return;
 884     }
 885
 886     if(cplband[q->js_subband_start] > cplband[q->subbands-1]) return;
 887
 888     length = cplband[q->subbands-1] - cplband[q->js_subband_start] + 1;
 889     for (i=0 ; i<length ; i++) {
 890        decouple_tab[cplband[q->js_subband_start] + i] = get_bits(&q->gb, q->js_vlc_bits);
 891     }
 892     return;
 893 }
 894
 895
 896 /**
 897  * function for decoding joint stereo data
 898  *
 899  * @param q                 pointer to the COOKContext
 900  * @param mlt_buffer1       pointer to left channel mlt coefficients
 901  * @param mlt_buffer2       pointer to right channel mlt coefficients
 902  */
 903
 904 static void joint_decode(COOKContext *q, float* mlt_buffer1,
 905                          float* mlt_buffer2) {
 906     int i,j;
 907     int decouple_tab[SUBBAND_SIZE];
 908     float decode_buffer[1060];
 909     int idx, cpl_tmp,tmp_idx;
 910     float f1,f2;
 911     float* cplscale;
 912
 913     memset(decouple_tab, 0, sizeof(decouple_tab));
 914     memset(decode_buffer, 0, sizeof(decode_buffer));
 915
 916     /* Make sure the buffers are zeroed out. */
 917     memset(mlt_buffer1,0, 1024*sizeof(float));
 918     memset(mlt_buffer2,0, 1024*sizeof(float));
 919     decouple_info(q, decouple_tab);
 920     mono_decode(q, decode_buffer);
 921
 922     /* The two channels are stored interleaved in decode_buffer. */
 923     for (i=0 ; i<q->js_subband_start ; i++) {
 924         for (j=0 ; j<SUBBAND_SIZE ; j++) {
 925             mlt_buffer1[i*20+j] = decode_buffer[i*40+j];
 926             mlt_buffer2[i*20+j] = decode_buffer[i*40+20+j];
 927         }
 928     }
 929
 930     /* When we reach js_subband_start (the higher frequencies)
 931        the coefficients are stored in a coupling scheme. */
 932     idx = (1 << q->js_vlc_bits) - 1;
 933     for (i=q->js_subband_start ; i<q->subbands ; i++) {
 934         cpl_tmp = cplband[i];
 935         idx -=decouple_tab[cpl_tmp];
 936         cplscale = (float*)cplscales[q->js_vlc_bits-2];  //choose decoupler table
 937         f1 = cplscale[decouple_tab[cpl_tmp]];
 938         f2 = cplscale[idx-1];
 939         for (j=0 ; j<SUBBAND_SIZE ; j++) {
 940             tmp_idx = ((q->js_subband_start + i)*20)+j;
 941             mlt_buffer1[20*i + j] = f1 * decode_buffer[tmp_idx];
 942             mlt_buffer2[20*i + j] = f2 * decode_buffer[tmp_idx];
 943         }
 944         idx = (1 << q->js_vlc_bits) - 1;
 945     }
 946 }
 947
 948 /**
 949  * Cook subpacket decoding. This function returns one decoded subpacket,
 950  * usually 1024 samples per channel.
 951  *
 952  * @param q                 pointer to the COOKContext
 953  * @param inbuffer          pointer to the inbuffer
 954  * @param sub_packet_size   subpacket size
 955  * @param outbuffer         pointer to the outbuffer
 956  */
 957
 958
 959 static int decode_subpacket(COOKContext *q, uint8_t *inbuffer,
 960                             int sub_packet_size, int16_t *outbuffer) {
 961     int i,j;
 962     int value;
 963     float* tmp_ptr;
 964
 965     /* packet dump */
 966 //    for (i=0 ; i<sub_packet_size ; i++) {
 967 //        av_log(NULL, AV_LOG_ERROR, "%02x", inbuffer[i]);
 968 //    }
 969 //    av_log(NULL, AV_LOG_ERROR, "\n");
 970
 971     decode_bytes(inbuffer, q->decoded_bytes_buffer, sub_packet_size);
 972     init_get_bits(&q->gb, q->decoded_bytes_buffer, sub_packet_size*8);
 973     decode_gain_info(&q->gb, &q->gain_current);
 974
 975     if(q->nb_channels==2 && q->joint_stereo==1){
 976         joint_decode(q, q->decode_buf_ptr[0], q->decode_buf_ptr[2]);
 977
 978         /* Swap buffer pointers. */
 979         tmp_ptr = q->decode_buf_ptr[1];
 980         q->decode_buf_ptr[1] = q->decode_buf_ptr[0];
 981         q->decode_buf_ptr[0] = tmp_ptr;
 982         tmp_ptr = q->decode_buf_ptr[3];
 983         q->decode_buf_ptr[3] = q->decode_buf_ptr[2];
 984         q->decode_buf_ptr[2] = tmp_ptr;
 985
 986         /* FIXME: Rethink the gainbuffer handling, maybe a rename?
 987            now/previous swap */
 988         q->gain_now_ptr = &q->gain_now;
 989         q->gain_previous_ptr = &q->gain_previous;
 990         for (i=0 ; i<q->nb_channels ; i++){
 991
 992             cook_imlt(q, q->decode_buf_ptr[i*2], q->mono_mdct_output, q->mlt_tmp);
 993             gain_compensate(q, q->mono_mdct_output, q->gain_now_ptr,
 994                             q->gain_previous_ptr, q->previous_buffer_ptr[0]);
 995
 996             /* Swap out the previous buffer. */
 997             tmp_ptr = q->previous_buffer_ptr[0];
 998             q->previous_buffer_ptr[0] = q->previous_buffer_ptr[1];
 999             q->previous_buffer_ptr[1] = tmp_ptr;
1000
1001             /* Clip and convert the floats to 16 bits. */
1002             for (j=0 ; j<q->samples_per_frame ; j++){
1003                 value = lrintf(q->mono_mdct_output[j]);
1004                 if(value < -32768) value = -32768;
1005                 else if(value > 32767) value = 32767;
1006                 outbuffer[2*j+i] = value;
1007             }
1008         }
1009
1010         memcpy(&q->gain_now, &q->gain_previous, sizeof(COOKgain));
1011         memcpy(&q->gain_previous, &q->gain_current, sizeof(COOKgain));
1012
1013     } else if (q->nb_channels==2 && q->joint_stereo==0) {
1014             /* channel 0 */
1015             mono_decode(q, q->decode_buf_ptr2[0]);
1016
1017             tmp_ptr = q->decode_buf_ptr2[0];
1018             q->decode_buf_ptr2[0] = q->decode_buf_ptr2[1];
1019             q->decode_buf_ptr2[1] = tmp_ptr;
1020
1021             memcpy(&q->gain_channel1[0], &q->gain_current ,sizeof(COOKgain));
1022             q->gain_now_ptr = &q->gain_channel1[0];
1023             q->gain_previous_ptr = &q->gain_channel1[1];
1024
1025             cook_imlt(q, q->decode_buf_ptr2[0], q->mono_mdct_output,q->mlt_tmp);
1026             gain_compensate(q, q->mono_mdct_output, q->gain_now_ptr,
1027                             q->gain_previous_ptr, q->mono_previous_buffer1);
1028
1029             memcpy(&q->gain_channel1[1], &q->gain_channel1[0],sizeof(COOKgain));
1030
1031
1032             for (j=0 ; j<q->samples_per_frame ; j++){
1033                 value = lrintf(q->mono_mdct_output[j]);
1034                 if(value < -32768) value = -32768;
1035                 else if(value > 32767) value = 32767;
1036                 outbuffer[2*j+1] = value;
1037             }
1038
1039             /* channel 1 */
1040             //av_log(NULL,AV_LOG_ERROR,"bits = %d\n",get_bits_count(&q->gb));
1041             init_get_bits(&q->gb, q->decoded_bytes_buffer, sub_packet_size*8+q->bits_per_subpacket);
1042
1043             q->gain_now_ptr = &q->gain_channel2[0];
1044             q->gain_previous_ptr = &q->gain_channel2[1];
1045
1046             decode_gain_info(&q->gb, &q->gain_channel2[0]);
1047             mono_decode(q, q->decode_buf_ptr[0]);
1048
1049             tmp_ptr = q->decode_buf_ptr[0];
1050             q->decode_buf_ptr[0] = q->decode_buf_ptr[1];
1051             q->decode_buf_ptr[1] = tmp_ptr;
1052
1053             cook_imlt(q, q->decode_buf_ptr[0], q->mono_mdct_output,q->mlt_tmp);
1054             gain_compensate(q, q->mono_mdct_output, q->gain_now_ptr,
1055                             q->gain_previous_ptr, q->mono_previous_buffer2);
1056
1057             /* Swap out the previous buffer. */
1058             tmp_ptr = q->previous_buffer_ptr[0];
1059             q->previous_buffer_ptr[0] = q->previous_buffer_ptr[1];
1060             q->previous_buffer_ptr[1] = tmp_ptr;
1061
1062             memcpy(&q->gain_channel2[1], &q->gain_channel2[0] ,sizeof(COOKgain));
1063
1064             for (j=0 ; j<q->samples_per_frame ; j++){
1065                 value = lrintf(q->mono_mdct_output[j]);
1066                 if(value < -32768) value = -32768;
1067                 else if(value > 32767) value = 32767;
1068                 outbuffer[2*j] = value;
1069             }
1070
1071     } else {
1072         mono_decode(q, q->decode_buf_ptr[0]);
1073
1074         /* Swap buffer pointers. */
1075         tmp_ptr = q->decode_buf_ptr[1];
1076         q->decode_buf_ptr[1] = q->decode_buf_ptr[0];
1077         q->decode_buf_ptr[0] = tmp_ptr;
1078
1079         /* FIXME: Rethink the gainbuffer handling, maybe a rename?
1080            now/previous swap */
1081         q->gain_now_ptr = &q->gain_now;
1082         q->gain_previous_ptr = &q->gain_previous;
1083
1084         cook_imlt(q, q->decode_buf_ptr[0], q->mono_mdct_output,q->mlt_tmp);
1085         gain_compensate(q, q->mono_mdct_output, q->gain_now_ptr,
1086                         q->gain_previous_ptr, q->mono_previous_buffer1);
1087
1088         /* Clip and convert the floats to 16 bits */
1089         for (j=0 ; j<q->samples_per_frame ; j++){
1090             value = lrintf(q->mono_mdct_output[j]);
1091             if(value < -32768) value = -32768;
1092             else if(value > 32767) value = 32767;
1093             outbuffer[j] = value;
1094         }
1095         memcpy(&q->gain_now, &q->gain_previous, sizeof(COOKgain));
1096         memcpy(&q->gain_previous, &q->gain_current, sizeof(COOKgain));
1097     }
1098     return q->samples_per_frame * sizeof(int16_t);
1099 }
1100
1101
1102 /**
1103  * Cook frame decoding
1104  *
1105  * @param avctx     pointer to the AVCodecContext
1106  */
1107
1108 static int cook_decode_frame(AVCodecContext *avctx,
1109             void *data, int *data_size,
1110             uint8_t *buf, int buf_size) {
1111     COOKContext *q = avctx->priv_data;
1112
1113     if (buf_size < avctx->block_align)
1114         return buf_size;
1115
1116     *data_size = decode_subpacket(q, buf, avctx->block_align, data);
1117
1118     return avctx->block_align;
1119 }
1120
1121 #ifdef COOKDEBUG
1122 static void dump_cook_context(COOKContext *q, COOKextradata *e)
1123 {
1124     //int i=0;
1125 #define PRINT(a,b) av_log(NULL,AV_LOG_ERROR," %s = %d\n", a, b);
1126     av_log(NULL,AV_LOG_ERROR,"COOKextradata\n");
1127     av_log(NULL,AV_LOG_ERROR,"cookversion=%x\n",e->cookversion);
1128     if (e->cookversion > MONO_COOK2) {
1129         PRINT("js_subband_start",e->js_subband_start);
1130         PRINT("js_vlc_bits",e->js_vlc_bits);
1131     }
1132     av_log(NULL,AV_LOG_ERROR,"COOKContext\n");
1133     PRINT("nb_channels",q->nb_channels);
1134     PRINT("bit_rate",q->bit_rate);
1135     PRINT("sample_rate",q->sample_rate);
1136     PRINT("samples_per_channel",q->samples_per_channel);
1137     PRINT("samples_per_frame",q->samples_per_frame);
1138     PRINT("subbands",q->subbands);
1139     PRINT("random_state",q->random_state);
1140     PRINT("mlt_size",q->mlt_size);
1141     PRINT("js_subband_start",q->js_subband_start);
1142     PRINT("log2_numvector_size",q->log2_numvector_size);
1143     PRINT("numvector_size",q->numvector_size);
1144     PRINT("total_subbands",q->total_subbands);
1145 }
1146 #endif
1147
1148 /**
1149  * Cook initialization
1150  *
1151  * @param avctx     pointer to the AVCodecContext
1152  */
1153
1154 static int cook_decode_init(AVCodecContext *avctx)
1155 {
1156     COOKextradata *e = avctx->extradata;
1157     COOKContext *q = avctx->priv_data;
1158
1159     /* Take care of the codec specific extradata. */
1160     if (avctx->extradata_size <= 0) {
1161         av_log(NULL,AV_LOG_ERROR,"Necessary extradata missing!\n");
1162         return -1;
1163     } else {
1164         /* 8 for mono, 16 for stereo, ? for multichannel
1165            Swap to right endianness so we don't need to care later on. */
1166         av_log(NULL,AV_LOG_DEBUG,"codecdata_length=%d\n",avctx->extradata_size);
1167         if (avctx->extradata_size >= 8){
1168             e->cookversion = be2me_32(e->cookversion);
1169             e->samples_per_frame = be2me_16(e->samples_per_frame);
1170             e->subbands = be2me_16(e->subbands);
1171         }
1172         if (avctx->extradata_size >= 16){
1173             e->js_subband_start = be2me_16(e->js_subband_start);
1174             e->js_vlc_bits = be2me_16(e->js_vlc_bits);
1175         }
1176     }
1177
1178     /* Take data from the AVCodecContext (RM container). */
1179     q->sample_rate = avctx->sample_rate;
1180     q->nb_channels = avctx->channels;
1181     q->bit_rate = avctx->bit_rate;
1182
1183     /* Initialize state. */
1184     q->random_state = 1;
1185
1186     /* Initialize extradata related variables. */
1187     q->samples_per_channel = e->samples_per_frame / q->nb_channels;
1188     q->samples_per_frame = e->samples_per_frame;
1189     q->subbands = e->subbands;
1190     q->bits_per_subpacket = avctx->block_align * 8;
1191
1192     /* Initialize default data states. */
1193     q->js_subband_start = 0;
1194     q->log2_numvector_size = 5;
1195     q->total_subbands = q->subbands;
1196
1197     /* Initialize version-dependent variables */
1198     av_log(NULL,AV_LOG_DEBUG,"e->cookversion=%x\n",e->cookversion);
1199     switch (e->cookversion) {
1200         case MONO_COOK1:
1201             if (q->nb_channels != 1) {
1202                 av_log(NULL,AV_LOG_ERROR,"Container channels != 1, report sample!\n");
1203                 return -1;
1204             }
1205             av_log(NULL,AV_LOG_DEBUG,"MONO_COOK1\n");
1206             break;
1207         case MONO_COOK2:
1208             if (q->nb_channels != 1) {
1209                 q->joint_stereo = 0;
1210                 q->bits_per_subpacket = q->bits_per_subpacket/2;
1211             }
1212             av_log(NULL,AV_LOG_DEBUG,"MONO_COOK2\n");
1213             break;
1214         case JOINT_STEREO:
1215             if (q->nb_channels != 2) {
1216                 av_log(NULL,AV_LOG_ERROR,"Container channels != 2, report sample!\n");
1217                 return -1;
1218             }
1219             av_log(NULL,AV_LOG_DEBUG,"JOINT_STEREO\n");
1220             if (avctx->extradata_size >= 16){
1221                 q->total_subbands = q->subbands + e->js_subband_start;
1222                 q->js_subband_start = e->js_subband_start;
1223                 q->joint_stereo = 1;
1224                 q->js_vlc_bits = e->js_vlc_bits;
1225             }
1226             if (q->samples_per_channel > 256) {
1227                 q->log2_numvector_size  = 6;
1228             }
1229             if (q->samples_per_channel > 512) {
1230                 q->log2_numvector_size  = 7;
1231             }
1232             break;
1233         case MC_COOK:
1234             av_log(NULL,AV_LOG_ERROR,"MC_COOK not supported!\n");
1235             return -1;
1236             break;
1237         default:
1238             av_log(NULL,AV_LOG_ERROR,"Unknown Cook version, report sample!\n");
1239             return -1;
1240             break;
1241     }
1242
1243     /* Initialize variable relations */
1244     q->mlt_size = q->samples_per_channel;
1245     q->numvector_size = (1 << q->log2_numvector_size);
1246
1247     /* Generate tables */
1248     init_rootpow2table(q);
1249     init_pow2table(q);
1250     init_gain_table(q);
1251
1252     if (init_cook_vlc_tables(q) != 0)
1253         return -1;
1254
1255
1256     if(avctx->block_align >= UINT_MAX/2)
1257         return -1;
1258
1259     /* Pad the databuffer with FF_INPUT_BUFFER_PADDING_SIZE,
1260        this is for the bitstreamreader. */
1261     if ((q->decoded_bytes_buffer = av_mallocz((avctx->block_align+(4-avctx->block_align%4) + FF_INPUT_BUFFER_PADDING_SIZE)*sizeof(uint8_t)))  == NULL)
1262         return -1;
1263
1264     q->decode_buf_ptr[0] = q->decode_buffer_1;
1265     q->decode_buf_ptr[1] = q->decode_buffer_2;
1266     q->decode_buf_ptr[2] = q->decode_buffer_3;
1267     q->decode_buf_ptr[3] = q->decode_buffer_4;
1268
1269     q->decode_buf_ptr2[0] = q->decode_buffer_3;
1270     q->decode_buf_ptr2[1] = q->decode_buffer_4;
1271
1272     q->previous_buffer_ptr[0] = q->mono_previous_buffer1;
1273     q->previous_buffer_ptr[1] = q->mono_previous_buffer2;
1274
1275     /* Initialize transform. */
1276     if ( init_cook_mlt(q) == 0 )
1277         return -1;
1278
1279     /* Try to catch some obviously faulty streams, othervise it might be exploitable */
1280     if (q->total_subbands > 53) {
1281         av_log(NULL,AV_LOG_ERROR,"total_subbands > 53, report sample!\n");
1282         return -1;
1283     }
1284     if (q->subbands > 50) {
1285         av_log(NULL,AV_LOG_ERROR,"subbands > 50, report sample!\n");
1286         return -1;
1287     }
1288     if ((q->samples_per_channel == 256) || (q->samples_per_channel == 512) || (q->samples_per_channel == 1024)) {
1289     } else {
1290         av_log(NULL,AV_LOG_ERROR,"unknown amount of samples_per_channel = %d, report sample!\n",q->samples_per_channel);
1291         return -1;
1292     }
1293
1294 #ifdef COOKDEBUG
1295     dump_cook_context(q,e);
1296 #endif
1297     return 0;
1298 }
1299
1300
1301 AVCodec cook_decoder =
1302 {
1303     .name = "cook",
1304     .type = CODEC_TYPE_AUDIO,
1305     .id = CODEC_ID_COOK,
1306     .priv_data_size = sizeof(COOKContext),
1307     .init = cook_decode_init,
1308     .close = cook_decode_close,
1309     .decode = cook_decode_frame,
1310 };