2 * COOK compatible decoder
3 * Copyright (c) 2003 Sascha Sommer
4 * Copyright (c) 2005 Benjamin Larsson
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 * Cook compatible decoder.
27 * This decoder handles RealNetworks, RealAudio G2 data.
28 * Cook is identified by the codec name cook in RM files.
30 * To use this decoder, a calling application must supply the extradata
31 * bytes provided from the RM container; 8+ bytes for mono streams and
32 * 16+ for stereo streams (maybe more).
34 * Codec technicalities (all this assume a buffer length of 1024):
35 * Cook works with several different techniques to achieve its compression.
36 * In the timedomain the buffer is divided into 8 pieces and quantized. If
37 * two neighboring pieces have different quantization index a smooth
38 * quantization curve is used to get a smooth overlap between the different
40 * To get to the transformdomain Cook uses a modulated lapped transform.
41 * The transform domain has 50 subbands with 20 elements each. This
42 * means only a maximum of 50*20=1000 coefficients are used out of the 1024
51 #include "bitstream.h"
54 #include "bytestream.h"
58 /* the different Cook versions */
59 #define MONO 0x1000001
60 #define STEREO 0x1000002
61 #define JOINT_STEREO 0x1000003
62 #define MC_COOK 0x2000000 //multichannel Cook, not supported
64 #define SUBBAND_SIZE 20
80 int samples_per_channel;
81 int samples_per_frame;
83 int log2_numvector_size;
84 int numvector_size; //1 << log2_numvector_size;
88 int bits_per_subpacket;
95 FFTSample mlt_tmp[1024] __attribute__((aligned(16))); /* temporary storage for imlt */
102 int mlt_size; //modulated lapped transform size
105 COOKgain *gain_ptr1[2];
106 COOKgain *gain_ptr2[2];
114 VLC envelope_quant_index[13];
115 VLC sqvh[7]; //scalar quantization
116 VLC ccpl; //channel coupling
118 /* generatable tables and related variables */
119 int gain_size_factor;
120 float gain_table[23];
122 float rootpow2tab[127];
126 uint8_t* decoded_bytes_buffer;
127 float mono_mdct_output[2048] __attribute__((aligned(16)));
128 float mono_previous_buffer1[1024];
129 float mono_previous_buffer2[1024];
130 float decode_buffer_1[1024];
131 float decode_buffer_2[1024];
134 /* debug functions */
137 static void dump_float_table(float* table, int size, int delimiter) {
139 av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
140 for (i=0 ; i<size ; i++) {
141 av_log(NULL, AV_LOG_ERROR, "%5.1f, ", table[i]);
142 if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
146 static void dump_int_table(int* table, int size, int delimiter) {
148 av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
149 for (i=0 ; i<size ; i++) {
150 av_log(NULL, AV_LOG_ERROR, "%d, ", table[i]);
151 if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
155 static void dump_short_table(short* table, int size, int delimiter) {
157 av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
158 for (i=0 ; i<size ; i++) {
159 av_log(NULL, AV_LOG_ERROR, "%d, ", table[i]);
160 if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
166 /*************** init functions ***************/
168 /* table generator */
169 static void init_pow2table(COOKContext *q){
171 q->pow2tab[63] = 1.0;
172 for (i=1 ; i<64 ; i++){
173 q->pow2tab[63+i]=(float)((uint64_t)1<<i);
174 q->pow2tab[63-i]=1.0/(float)((uint64_t)1<<i);
178 /* table generator */
179 static void init_rootpow2table(COOKContext *q){
181 q->rootpow2tab[63] = 1.0;
182 for (i=1 ; i<64 ; i++){
183 q->rootpow2tab[63+i]=sqrt((float)((uint64_t)1<<i));
184 q->rootpow2tab[63-i]=sqrt(1.0/(float)((uint64_t)1<<i));
188 /* table generator */
189 static void init_gain_table(COOKContext *q) {
191 q->gain_size_factor = q->samples_per_channel/8;
192 for (i=0 ; i<23 ; i++) {
193 q->gain_table[i] = pow((double)q->pow2tab[i+52] ,
194 (1.0/(double)q->gain_size_factor));
199 static int init_cook_vlc_tables(COOKContext *q) {
203 for (i=0 ; i<13 ; i++) {
204 result &= init_vlc (&q->envelope_quant_index[i], 9, 24,
205 envelope_quant_index_huffbits[i], 1, 1,
206 envelope_quant_index_huffcodes[i], 2, 2, 0);
208 av_log(NULL,AV_LOG_DEBUG,"sqvh VLC init\n");
209 for (i=0 ; i<7 ; i++) {
210 result &= init_vlc (&q->sqvh[i], vhvlcsize_tab[i], vhsize_tab[i],
211 cvh_huffbits[i], 1, 1,
212 cvh_huffcodes[i], 2, 2, 0);
215 if (q->nb_channels==2 && q->joint_stereo==1){
216 result &= init_vlc (&q->ccpl, 6, (1<<q->js_vlc_bits)-1,
217 ccpl_huffbits[q->js_vlc_bits-2], 1, 1,
218 ccpl_huffcodes[q->js_vlc_bits-2], 2, 2, 0);
219 av_log(NULL,AV_LOG_DEBUG,"Joint-stereo VLC used.\n");
222 av_log(NULL,AV_LOG_DEBUG,"VLC tables initialized.\n");
226 static int init_cook_mlt(COOKContext *q) {
230 /* Allocate the buffers, could be replaced with a static [512]
232 q->mlt_size = q->samples_per_channel;
233 q->mlt_window = av_malloc(sizeof(float)*q->mlt_size);
234 q->mlt_precos = av_malloc(sizeof(float)*q->mlt_size/2);
235 q->mlt_presin = av_malloc(sizeof(float)*q->mlt_size/2);
236 q->mlt_postcos = av_malloc(sizeof(float)*q->mlt_size/2);
238 /* Initialize the MLT window: simple sine window. */
239 alpha = M_PI / (2.0 * (float)q->mlt_size);
240 for(j=0 ; j<q->mlt_size ; j++) {
241 q->mlt_window[j] = sin((j + 512.0/(float)q->mlt_size) * alpha);
244 /* pre/post twiddle factors */
245 for (j=0 ; j<q->mlt_size/2 ; j++){
246 q->mlt_precos[j] = cos( ((j+0.25)*M_PI)/q->mlt_size);
247 q->mlt_presin[j] = sin( ((j+0.25)*M_PI)/q->mlt_size);
248 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
251 /* Initialize the FFT. */
252 ff_fft_init(&q->fft_ctx, av_log2(q->mlt_size)-1, 0);
253 av_log(NULL,AV_LOG_DEBUG,"FFT initialized, order = %d.\n",
254 av_log2(q->samples_per_channel)-1);
256 return (int)(q->mlt_window && q->mlt_precos && q->mlt_presin && q->mlt_postcos);
259 /*************** init functions end ***********/
262 * Cook indata decoding, every 32 bits are XORed with 0x37c511f2.
263 * Why? No idea, some checksum/error detection method maybe.
265 * Out buffer size: extra bytes are needed to cope with
266 * padding/missalignment.
267 * Subpackets passed to the decoder can contain two, consecutive
268 * half-subpackets, of identical but arbitrary size.
269 * 1234 1234 1234 1234 extraA extraB
270 * Case 1: AAAA BBBB 0 0
271 * Case 2: AAAA ABBB BB-- 3 3
272 * Case 3: AAAA AABB BBBB 2 2
273 * Case 4: AAAA AAAB BBBB BB-- 1 5
275 * Nice way to waste CPU cycles.
277 * @param inbuffer pointer to byte array of indata
278 * @param out pointer to byte array of outdata
279 * @param bytes number of bytes
281 #define DECODE_BYTES_PAD1(bytes) (3 - ((bytes)+3) % 4)
282 #define DECODE_BYTES_PAD2(bytes) ((bytes) % 4 + DECODE_BYTES_PAD1(2 * (bytes)))
284 static inline int decode_bytes(uint8_t* inbuffer, uint8_t* out, int bytes){
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. */
295 off = (int)((long)inbuffer & 3);
296 buf = (uint32_t*) (inbuffer - off);
297 c = be2me_32((0x37c511f2 >> (off*8)) | (0x37c511f2 << (32-(off*8))));
299 for (i = 0; i < bytes/4; i++)
300 obuf[i] = c ^ buf[i];
309 static int cook_decode_close(AVCodecContext *avctx)
312 COOKContext *q = avctx->priv_data;
313 av_log(avctx,AV_LOG_DEBUG, "Deallocating memory.\n");
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);
322 /* Free the transform. */
323 ff_fft_end(&q->fft_ctx);
325 /* Free the VLC tables. */
326 for (i=0 ; i<13 ; i++) {
327 free_vlc(&q->envelope_quant_index[i]);
329 for (i=0 ; i<7 ; i++) {
330 free_vlc(&q->sqvh[i]);
332 if(q->nb_channels==2 && q->joint_stereo==1 ){
336 av_log(NULL,AV_LOG_DEBUG,"Memory deallocated.\n");
342 * Fill the COOKgain structure for the timedomain quantization.
344 * @param q pointer to the COOKContext
345 * @param gaininfo pointer to the COOKgain
348 static void decode_gain_info(GetBitContext *gb, COOKgain* gaininfo) {
351 while (get_bits1(gb)) {}
353 gaininfo->size = get_bits_count(gb) - 1; //amount of elements*2 to update
355 if (get_bits_count(gb) - 1 <= 0) return;
357 for (i=0 ; i<gaininfo->size ; i++){
358 gaininfo->qidx_table1[i] = get_bits(gb,3);
360 gaininfo->qidx_table2[i] = get_bits(gb,4) - 7; //convert to signed
362 gaininfo->qidx_table2[i] = -1;
368 * Create the quant index table needed for the envelope.
370 * @param q pointer to the COOKContext
371 * @param quant_index_table pointer to the array
374 static void decode_envelope(COOKContext *q, int* quant_index_table) {
378 bitbias = get_bits_count(&q->gb);
379 quant_index_table[0]= get_bits(&q->gb,6) - 6; //This is used later in categorize
381 for (i=1 ; i < q->total_subbands ; i++){
383 if (i >= q->js_subband_start * 2) {
384 vlc_index-=q->js_subband_start;
387 if(vlc_index < 1) vlc_index = 1;
389 if (vlc_index>13) vlc_index = 13; //the VLC tables >13 are identical to No. 13
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
398 * Create the quant value table.
400 * @param q pointer to the COOKContext
401 * @param quant_value_table pointer to the array
404 static void inline dequant_envelope(COOKContext *q, int* quant_index_table,
405 float* quant_value_table){
408 for(i=0 ; i < q->total_subbands ; i++){
409 quant_value_table[i] = q->rootpow2tab[quant_index_table[i]+63];
414 * Calculate the category and category_index vector.
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
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;
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;
434 bits_left = q->bits_per_subpacket - get_bits_count(&q->gb);
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);
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));
450 for (i=32 ; i>0 ; i=i/2){
453 for (j=q->total_subbands ; j>0 ; j--){
454 exp_idx = (i - quant_index_table[index] + bias) / 2;
457 } else if(exp_idx >7) {
461 num_bits+=expbits_tab[exp_idx];
463 if(num_bits >= bits_left - 32){
468 /* Calculate total number of bits. */
470 for (i=0 ; i<q->total_subbands ; i++) {
471 exp_idx = (bias - quant_index_table[i]) / 2;
474 } else if(exp_idx >7) {
477 num_bits += expbits_tab[exp_idx];
478 exp_index1[i] = exp_idx;
479 exp_index2[i] = exp_idx;
481 tmpbias = bias = num_bits;
483 for (j = 1 ; j < q->numvector_size ; j++) {
484 if (tmpbias + bias > 2*bits_left) { /* ---> */
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;
497 tmp_categorize_array1[tmp_categorize_array1_idx++] = index;
498 tmpbias -= expbits_tab[exp_index1[index]] -
499 expbits_tab[exp_index1[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];
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];
521 for(i=0 ; i<q->total_subbands ; i++)
522 category[i] = exp_index2[i];
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];
528 for(i=0;i<tmp_categorize_array1_idx;i++)
529 category_index[category_index_size++ ] = tmp_categorize_array1[i];
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++)
540 * Expand the category vector.
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
547 static void inline expand_category(COOKContext *q, int* category,
548 int* category_index){
550 for(i=0 ; i<q->num_vectors ; i++){
551 ++category[category_index[i]];
556 * The real requantization of the mltcoefs
558 * @param q pointer to the COOKContext
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
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){
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]];
579 f1 = quant_centroid_tab[index][subband_coef_index[i]];
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
586 mlt_buffer[band*20+ i] = f1 * quant_value_table[band];
590 * Unpack the subband_coef_index and subband_coef_noise vectors.
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
598 static int unpack_SQVH(COOKContext *q, int category, int* subband_coef_index,
599 int* subband_coef_noise) {
601 int vlc, vd ,tmp, result;
605 vd = vd_tab[category];
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)){
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);
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);
626 subband_coef_noise[i*vd+j]=0;
629 subband_coef_noise[i*vd+j]=0;
638 * Fill the mlt_buffer with mlt coefficients.
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
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];
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)){
663 for(j=0 ; j<q->total_subbands ; j++) category[band+j]=7;
667 memset(subband_coef_index, 0, sizeof(subband_coef_index));
668 memset(subband_coef_noise, 0, sizeof(subband_coef_noise));
670 scalar_dequant(q, index, band, quant_value_table, subband_coef_index,
671 subband_coef_noise, mlt_buffer);
674 if(q->total_subbands*SUBBAND_SIZE >= q->samples_per_channel){
681 * function for decoding mono data
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
688 static void mono_decode(COOKContext *q, float* mlt_buffer) {
690 int category_index[128];
691 float quant_value_table[102];
692 int quant_index_table[102];
695 memset(&category, 0, 128*sizeof(int));
696 memset(&quant_value_table, 0, 102*sizeof(int));
697 memset(&category_index, 0, 128*sizeof(int));
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);
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.
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
720 static void cook_imlt(COOKContext *q, float* inbuffer, float* outbuffer,
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]);
733 ff_fft_permute(&q->fft_ctx, (FFTComplex *) outbuffer);
734 ff_fft_calc (&q->fft_ctx, (FFTComplex *) outbuffer);
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]);
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] *
758 * the actual requantization of the timedomain samples
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
766 static void interpolate(COOKContext *q, float* buffer,
767 int gain_index, int gain_index_next){
770 fc1 = q->pow2tab[gain_index+63];
772 if(gain_index == gain_index_next){ //static gain
773 for(i=0 ; i<q->gain_size_factor ; i++){
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++){
788 * timedomain requantization of the timedomain samples
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
796 static void gain_window(COOKContext *q, float* buffer, COOKgain* gain_now,
797 COOKgain* gain_previous){
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];
809 gain_index[i]=gain_index[i+1];
812 /* This is applied to the to be previous data buffer. */
814 interpolate(q, &buffer[q->samples_per_channel+q->gain_size_factor*i],
815 gain_index[i], gain_index[i+1]);
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];
825 gain_index[i]=gain_index[i+1];
829 /* This is applied to the to be current block. */
831 interpolate(q, &buffer[i*q->gain_size_factor],
832 tmp_gain_index+gain_index[i],
833 tmp_gain_index+gain_index[i+1]);
839 * mlt overlapping and buffer management
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
849 static void gain_compensate(COOKContext *q, float* buffer, COOKgain* gain_now,
850 COOKgain* gain_previous, float* previous_buffer) {
852 if((gain_now->size || gain_previous->size)) {
853 gain_window(q, buffer, gain_now, gain_previous);
856 /* Overlap with the previous block. */
857 for(i=0 ; i<q->samples_per_channel ; i++) buffer[i]+=previous_buffer[i];
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);
866 * function for getting the jointstereo coupling information
868 * @param q pointer to the COOKContext
869 * @param decouple_tab decoupling array
873 static void decouple_info(COOKContext *q, int* decouple_tab){
876 if(get_bits1(&q->gb)) {
877 if(cplband[q->js_subband_start] > cplband[q->subbands-1]) return;
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);
886 if(cplband[q->js_subband_start] > cplband[q->subbands-1]) return;
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);
897 * function for decoding joint stereo data
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
904 static void joint_decode(COOKContext *q, float* mlt_buffer1,
905 float* mlt_buffer2) {
907 int decouple_tab[SUBBAND_SIZE];
908 float decode_buffer[1060];
909 int idx, cpl_tmp,tmp_idx;
913 memset(decouple_tab, 0, sizeof(decouple_tab));
914 memset(decode_buffer, 0, sizeof(decode_buffer));
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);
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];
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];
944 idx = (1 << q->js_vlc_bits) - 1;
949 * First part of subpacket decoding:
950 * decode raw stream bytes and read gain info.
952 * @param q pointer to the COOKContext
953 * @param inbuffer pointer to raw stream data
954 * @param gain_ptr array of current/prev gain pointers
958 decode_bytes_and_gain(COOKContext *q, uint8_t *inbuffer,
959 COOKgain *gain_ptr[])
963 offset = decode_bytes(inbuffer, q->decoded_bytes_buffer,
964 q->bits_per_subpacket/8);
965 init_get_bits(&q->gb, q->decoded_bytes_buffer + offset,
966 q->bits_per_subpacket);
967 decode_gain_info(&q->gb, gain_ptr[0]);
969 /* Swap current and previous gains */
970 FFSWAP(COOKgain *, gain_ptr[0], gain_ptr[1]);
974 * Final part of subpacket decoding:
975 * Apply modulated lapped transform, gain compensation,
976 * clip and convert to integer.
978 * @param q pointer to the COOKContext
979 * @param decode_buffer pointer to the mlt coefficients
980 * @param gain_ptr array of current/prev gain pointers
981 * @param previous_buffer pointer to the previous buffer to be used for overlapping
982 * @param out pointer to the output buffer
983 * @param chan 0: left or single channel, 1: right channel
987 mlt_compensate_output(COOKContext *q, float *decode_buffer,
988 COOKgain *gain_ptr[], float *previous_buffer,
989 int16_t *out, int chan)
993 cook_imlt(q, decode_buffer, q->mono_mdct_output, q->mlt_tmp);
994 gain_compensate(q, q->mono_mdct_output, gain_ptr[0],
995 gain_ptr[1], previous_buffer);
997 /* Clip and convert floats to 16 bits.
999 for (j = 0; j < q->samples_per_channel; j++) {
1000 out[chan + q->nb_channels * j] =
1001 clip(lrintf(q->mono_mdct_output[j]), -32768, 32767);
1007 * Cook subpacket decoding. This function returns one decoded subpacket,
1008 * usually 1024 samples per channel.
1010 * @param q pointer to the COOKContext
1011 * @param inbuffer pointer to the inbuffer
1012 * @param sub_packet_size subpacket size
1013 * @param outbuffer pointer to the outbuffer
1017 static int decode_subpacket(COOKContext *q, uint8_t *inbuffer,
1018 int sub_packet_size, int16_t *outbuffer) {
1020 // for (i=0 ; i<sub_packet_size ; i++) {
1021 // av_log(NULL, AV_LOG_ERROR, "%02x", inbuffer[i]);
1023 // av_log(NULL, AV_LOG_ERROR, "\n");
1025 decode_bytes_and_gain(q, inbuffer, q->gain_ptr1);
1027 if (q->joint_stereo) {
1028 joint_decode(q, q->decode_buffer_1, q->decode_buffer_2);
1030 mono_decode(q, q->decode_buffer_1);
1032 if (q->nb_channels == 2) {
1033 decode_bytes_and_gain(q, inbuffer + sub_packet_size/2,
1035 mono_decode(q, q->decode_buffer_2);
1039 mlt_compensate_output(q, q->decode_buffer_1, q->gain_ptr1,
1040 q->mono_previous_buffer1, outbuffer, 0);
1042 if (q->nb_channels == 2) {
1043 if (q->joint_stereo) {
1044 mlt_compensate_output(q, q->decode_buffer_2, q->gain_ptr1,
1045 q->mono_previous_buffer2, outbuffer, 1);
1047 mlt_compensate_output(q, q->decode_buffer_2, q->gain_ptr2,
1048 q->mono_previous_buffer2, outbuffer, 1);
1051 return q->samples_per_frame * sizeof(int16_t);
1056 * Cook frame decoding
1058 * @param avctx pointer to the AVCodecContext
1061 static int cook_decode_frame(AVCodecContext *avctx,
1062 void *data, int *data_size,
1063 uint8_t *buf, int buf_size) {
1064 COOKContext *q = avctx->priv_data;
1066 if (buf_size < avctx->block_align)
1069 *data_size = decode_subpacket(q, buf, avctx->block_align, data);
1071 return avctx->block_align;
1075 static void dump_cook_context(COOKContext *q)
1078 #define PRINT(a,b) av_log(NULL,AV_LOG_ERROR," %s = %d\n", a, b);
1079 av_log(NULL,AV_LOG_ERROR,"COOKextradata\n");
1080 av_log(NULL,AV_LOG_ERROR,"cookversion=%x\n",q->cookversion);
1081 if (q->cookversion > STEREO) {
1082 PRINT("js_subband_start",q->js_subband_start);
1083 PRINT("js_vlc_bits",q->js_vlc_bits);
1085 av_log(NULL,AV_LOG_ERROR,"COOKContext\n");
1086 PRINT("nb_channels",q->nb_channels);
1087 PRINT("bit_rate",q->bit_rate);
1088 PRINT("sample_rate",q->sample_rate);
1089 PRINT("samples_per_channel",q->samples_per_channel);
1090 PRINT("samples_per_frame",q->samples_per_frame);
1091 PRINT("subbands",q->subbands);
1092 PRINT("random_state",q->random_state);
1093 PRINT("mlt_size",q->mlt_size);
1094 PRINT("js_subband_start",q->js_subband_start);
1095 PRINT("log2_numvector_size",q->log2_numvector_size);
1096 PRINT("numvector_size",q->numvector_size);
1097 PRINT("total_subbands",q->total_subbands);
1102 * Cook initialization
1104 * @param avctx pointer to the AVCodecContext
1107 static int cook_decode_init(AVCodecContext *avctx)
1109 COOKContext *q = avctx->priv_data;
1110 uint8_t *edata_ptr = avctx->extradata;
1112 /* Take care of the codec specific extradata. */
1113 if (avctx->extradata_size <= 0) {
1114 av_log(avctx,AV_LOG_ERROR,"Necessary extradata missing!\n");
1117 /* 8 for mono, 16 for stereo, ? for multichannel
1118 Swap to right endianness so we don't need to care later on. */
1119 av_log(avctx,AV_LOG_DEBUG,"codecdata_length=%d\n",avctx->extradata_size);
1120 if (avctx->extradata_size >= 8){
1121 q->cookversion = be2me_32(bytestream_get_le32(&edata_ptr));
1122 q->samples_per_frame = be2me_16(bytestream_get_le16(&edata_ptr));
1123 q->subbands = be2me_16(bytestream_get_le16(&edata_ptr));
1125 if (avctx->extradata_size >= 16){
1126 bytestream_get_le32(&edata_ptr); //Unknown unused
1127 q->js_subband_start = be2me_16(bytestream_get_le16(&edata_ptr));
1128 q->js_vlc_bits = be2me_16(bytestream_get_le16(&edata_ptr));
1132 /* Take data from the AVCodecContext (RM container). */
1133 q->sample_rate = avctx->sample_rate;
1134 q->nb_channels = avctx->channels;
1135 q->bit_rate = avctx->bit_rate;
1137 /* Initialize state. */
1138 q->random_state = 1;
1140 /* Initialize extradata related variables. */
1141 q->samples_per_channel = q->samples_per_frame / q->nb_channels;
1142 q->bits_per_subpacket = avctx->block_align * 8;
1144 /* Initialize default data states. */
1145 q->log2_numvector_size = 5;
1146 q->total_subbands = q->subbands;
1148 /* Initialize version-dependent variables */
1149 av_log(NULL,AV_LOG_DEBUG,"q->cookversion=%x\n",q->cookversion);
1150 q->joint_stereo = 0;
1151 switch (q->cookversion) {
1153 if (q->nb_channels != 1) {
1154 av_log(avctx,AV_LOG_ERROR,"Container channels != 1, report sample!\n");
1157 av_log(avctx,AV_LOG_DEBUG,"MONO\n");
1160 if (q->nb_channels != 1) {
1161 q->bits_per_subpacket = q->bits_per_subpacket/2;
1163 av_log(avctx,AV_LOG_DEBUG,"STEREO\n");
1166 if (q->nb_channels != 2) {
1167 av_log(avctx,AV_LOG_ERROR,"Container channels != 2, report sample!\n");
1170 av_log(avctx,AV_LOG_DEBUG,"JOINT_STEREO\n");
1171 if (avctx->extradata_size >= 16){
1172 q->total_subbands = q->subbands + q->js_subband_start;
1173 q->joint_stereo = 1;
1175 if (q->samples_per_channel > 256) {
1176 q->log2_numvector_size = 6;
1178 if (q->samples_per_channel > 512) {
1179 q->log2_numvector_size = 7;
1183 av_log(avctx,AV_LOG_ERROR,"MC_COOK not supported!\n");
1187 av_log(avctx,AV_LOG_ERROR,"Unknown Cook version, report sample!\n");
1192 /* Initialize variable relations */
1193 q->mlt_size = q->samples_per_channel;
1194 q->numvector_size = (1 << q->log2_numvector_size);
1196 /* Generate tables */
1197 init_rootpow2table(q);
1201 if (init_cook_vlc_tables(q) != 0)
1205 if(avctx->block_align >= UINT_MAX/2)
1208 /* Pad the databuffer with:
1209 DECODE_BYTES_PAD1 or DECODE_BYTES_PAD2 for decode_bytes(),
1210 FF_INPUT_BUFFER_PADDING_SIZE, for the bitstreamreader. */
1211 if (q->nb_channels==2 && q->joint_stereo==0) {
1212 q->decoded_bytes_buffer =
1213 av_mallocz(avctx->block_align/2
1214 + DECODE_BYTES_PAD2(avctx->block_align/2)
1215 + FF_INPUT_BUFFER_PADDING_SIZE);
1217 q->decoded_bytes_buffer =
1218 av_mallocz(avctx->block_align
1219 + DECODE_BYTES_PAD1(avctx->block_align)
1220 + FF_INPUT_BUFFER_PADDING_SIZE);
1222 if (q->decoded_bytes_buffer == NULL)
1225 q->gain_ptr1[0] = &q->gain_1;
1226 q->gain_ptr1[1] = &q->gain_2;
1227 q->gain_ptr2[0] = &q->gain_3;
1228 q->gain_ptr2[1] = &q->gain_4;
1230 /* Initialize transform. */
1231 if ( init_cook_mlt(q) == 0 )
1234 /* Try to catch some obviously faulty streams, othervise it might be exploitable */
1235 if (q->total_subbands > 53) {
1236 av_log(avctx,AV_LOG_ERROR,"total_subbands > 53, report sample!\n");
1239 if (q->subbands > 50) {
1240 av_log(avctx,AV_LOG_ERROR,"subbands > 50, report sample!\n");
1243 if ((q->samples_per_channel == 256) || (q->samples_per_channel == 512) || (q->samples_per_channel == 1024)) {
1245 av_log(avctx,AV_LOG_ERROR,"unknown amount of samples_per_channel = %d, report sample!\n",q->samples_per_channel);
1248 if ((q->js_vlc_bits > 6) || (q->js_vlc_bits < 0)) {
1249 av_log(avctx,AV_LOG_ERROR,"q->js_vlc_bits = %d, only >= 0 and <= 6 allowed!\n",q->js_vlc_bits);
1254 dump_cook_context(q);
1260 AVCodec cook_decoder =
1263 .type = CODEC_TYPE_AUDIO,
1264 .id = CODEC_ID_COOK,
1265 .priv_data_size = sizeof(COOKContext),
1266 .init = cook_decode_init,
1267 .close = cook_decode_close,
1268 .decode = cook_decode_frame,