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"
59 /* the different Cook versions */
60 #define MONO 0x1000001
61 #define STEREO 0x1000002
62 #define JOINT_STEREO 0x1000003
63 #define MC_COOK 0x2000000 //multichannel Cook, not supported
65 #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;
91 AVRandomState random_state;
95 DECLARE_ALIGNED_16(FFTSample, mdct_tmp[1024]); /* temporary storage for imlt */
108 VLC envelope_quant_index[13];
109 VLC sqvh[7]; //scalar quantization
110 VLC ccpl; //channel coupling
112 /* generatable tables and related variables */
113 int gain_size_factor;
114 float gain_table[23];
116 float rootpow2tab[127];
120 uint8_t* decoded_bytes_buffer;
121 DECLARE_ALIGNED_16(float,mono_mdct_output[2048]);
122 float mono_previous_buffer1[1024];
123 float mono_previous_buffer2[1024];
124 float decode_buffer_1[1024];
125 float decode_buffer_2[1024];
128 /* debug functions */
131 static void dump_float_table(float* table, int size, int delimiter) {
133 av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
134 for (i=0 ; i<size ; i++) {
135 av_log(NULL, AV_LOG_ERROR, "%5.1f, ", table[i]);
136 if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
140 static void dump_int_table(int* table, int size, int delimiter) {
142 av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
143 for (i=0 ; i<size ; i++) {
144 av_log(NULL, AV_LOG_ERROR, "%d, ", table[i]);
145 if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
149 static void dump_short_table(short* table, int size, int delimiter) {
151 av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
152 for (i=0 ; i<size ; i++) {
153 av_log(NULL, AV_LOG_ERROR, "%d, ", table[i]);
154 if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
160 /*************** init functions ***************/
162 /* table generator */
163 static void init_pow2table(COOKContext *q){
165 q->pow2tab[63] = 1.0;
166 for (i=1 ; i<64 ; i++){
167 q->pow2tab[63+i]=(float)((uint64_t)1<<i);
168 q->pow2tab[63-i]=1.0/(float)((uint64_t)1<<i);
172 /* table generator */
173 static void init_rootpow2table(COOKContext *q){
175 q->rootpow2tab[63] = 1.0;
176 for (i=1 ; i<64 ; i++){
177 q->rootpow2tab[63+i]=sqrt((float)((uint64_t)1<<i));
178 q->rootpow2tab[63-i]=sqrt(1.0/(float)((uint64_t)1<<i));
182 /* table generator */
183 static void init_gain_table(COOKContext *q) {
185 q->gain_size_factor = q->samples_per_channel/8;
186 for (i=0 ; i<23 ; i++) {
187 q->gain_table[i] = pow((double)q->pow2tab[i+52] ,
188 (1.0/(double)q->gain_size_factor));
193 static int init_cook_vlc_tables(COOKContext *q) {
197 for (i=0 ; i<13 ; i++) {
198 result &= init_vlc (&q->envelope_quant_index[i], 9, 24,
199 envelope_quant_index_huffbits[i], 1, 1,
200 envelope_quant_index_huffcodes[i], 2, 2, 0);
202 av_log(NULL,AV_LOG_DEBUG,"sqvh VLC init\n");
203 for (i=0 ; i<7 ; i++) {
204 result &= init_vlc (&q->sqvh[i], vhvlcsize_tab[i], vhsize_tab[i],
205 cvh_huffbits[i], 1, 1,
206 cvh_huffcodes[i], 2, 2, 0);
209 if (q->nb_channels==2 && q->joint_stereo==1){
210 result &= init_vlc (&q->ccpl, 6, (1<<q->js_vlc_bits)-1,
211 ccpl_huffbits[q->js_vlc_bits-2], 1, 1,
212 ccpl_huffcodes[q->js_vlc_bits-2], 2, 2, 0);
213 av_log(NULL,AV_LOG_DEBUG,"Joint-stereo VLC used.\n");
216 av_log(NULL,AV_LOG_DEBUG,"VLC tables initialized.\n");
220 static int init_cook_mlt(COOKContext *q) {
223 int mlt_size = q->samples_per_channel;
225 if ((q->mlt_window = av_malloc(sizeof(float)*mlt_size)) == 0)
228 /* Initialize the MLT window: simple sine window. */
229 alpha = M_PI / (2.0 * (float)mlt_size);
230 for(j=0 ; j<mlt_size ; j++)
231 q->mlt_window[j] = sin((j + 0.5) * alpha) * sqrt(2.0 / q->samples_per_channel);
233 /* Initialize the MDCT. */
234 if (ff_mdct_init(&q->mdct_ctx, av_log2(mlt_size)+1, 1)) {
235 av_free(q->mlt_window);
238 av_log(NULL,AV_LOG_DEBUG,"MDCT initialized, order = %d.\n",
239 av_log2(mlt_size)+1);
244 /*************** init functions end ***********/
247 * Cook indata decoding, every 32 bits are XORed with 0x37c511f2.
248 * Why? No idea, some checksum/error detection method maybe.
250 * Out buffer size: extra bytes are needed to cope with
251 * padding/missalignment.
252 * Subpackets passed to the decoder can contain two, consecutive
253 * half-subpackets, of identical but arbitrary size.
254 * 1234 1234 1234 1234 extraA extraB
255 * Case 1: AAAA BBBB 0 0
256 * Case 2: AAAA ABBB BB-- 3 3
257 * Case 3: AAAA AABB BBBB 2 2
258 * Case 4: AAAA AAAB BBBB BB-- 1 5
260 * Nice way to waste CPU cycles.
262 * @param inbuffer pointer to byte array of indata
263 * @param out pointer to byte array of outdata
264 * @param bytes number of bytes
266 #define DECODE_BYTES_PAD1(bytes) (3 - ((bytes)+3) % 4)
267 #define DECODE_BYTES_PAD2(bytes) ((bytes) % 4 + DECODE_BYTES_PAD1(2 * (bytes)))
269 static inline int decode_bytes(uint8_t* inbuffer, uint8_t* out, int bytes){
273 uint32_t* obuf = (uint32_t*) out;
274 /* FIXME: 64 bit platforms would be able to do 64 bits at a time.
275 * I'm too lazy though, should be something like
276 * for(i=0 ; i<bitamount/64 ; i++)
277 * (int64_t)out[i] = 0x37c511f237c511f2^be2me_64(int64_t)in[i]);
278 * Buffer alignment needs to be checked. */
280 off = (int)((long)inbuffer & 3);
281 buf = (uint32_t*) (inbuffer - off);
282 c = be2me_32((0x37c511f2 >> (off*8)) | (0x37c511f2 << (32-(off*8))));
284 for (i = 0; i < bytes/4; i++)
285 obuf[i] = c ^ buf[i];
294 static int cook_decode_close(AVCodecContext *avctx)
297 COOKContext *q = avctx->priv_data;
298 av_log(avctx,AV_LOG_DEBUG, "Deallocating memory.\n");
300 /* Free allocated memory buffers. */
301 av_free(q->mlt_window);
302 av_free(q->decoded_bytes_buffer);
304 /* Free the transform. */
305 ff_mdct_end(&q->mdct_ctx);
307 /* Free the VLC tables. */
308 for (i=0 ; i<13 ; i++) {
309 free_vlc(&q->envelope_quant_index[i]);
311 for (i=0 ; i<7 ; i++) {
312 free_vlc(&q->sqvh[i]);
314 if(q->nb_channels==2 && q->joint_stereo==1 ){
318 av_log(NULL,AV_LOG_DEBUG,"Memory deallocated.\n");
324 * Fill the gain array for the timedomain quantization.
326 * @param q pointer to the COOKContext
327 * @param gaininfo[9] array of gain indices
330 static void decode_gain_info(GetBitContext *gb, int *gaininfo)
334 while (get_bits1(gb)) {}
335 n = get_bits_count(gb) - 1; //amount of elements*2 to update
339 int index = get_bits(gb, 3);
340 int gain = get_bits1(gb) ? get_bits(gb, 4) - 7 : -1;
342 while (i <= index) gaininfo[i++] = gain;
344 while (i <= 8) gaininfo[i++] = 0;
348 * Create the quant index table needed for the envelope.
350 * @param q pointer to the COOKContext
351 * @param quant_index_table pointer to the array
354 static void decode_envelope(COOKContext *q, int* quant_index_table) {
358 bitbias = get_bits_count(&q->gb);
359 quant_index_table[0]= get_bits(&q->gb,6) - 6; //This is used later in categorize
361 for (i=1 ; i < q->total_subbands ; i++){
363 if (i >= q->js_subband_start * 2) {
364 vlc_index-=q->js_subband_start;
367 if(vlc_index < 1) vlc_index = 1;
369 if (vlc_index>13) vlc_index = 13; //the VLC tables >13 are identical to No. 13
371 j = get_vlc2(&q->gb, q->envelope_quant_index[vlc_index-1].table,
372 q->envelope_quant_index[vlc_index-1].bits,2);
373 quant_index_table[i] = quant_index_table[i-1] + j - 12; //differential encoding
378 * Calculate the category and category_index vector.
380 * @param q pointer to the COOKContext
381 * @param quant_index_table pointer to the array
382 * @param category pointer to the category array
383 * @param category_index pointer to the category_index array
386 static void categorize(COOKContext *q, int* quant_index_table,
387 int* category, int* category_index){
388 int exp_idx, bias, tmpbias, bits_left, num_bits, index, v, i, j;
392 int tmp_categorize_array1[128];
393 int tmp_categorize_array1_idx=0;
394 int tmp_categorize_array2[128];
395 int tmp_categorize_array2_idx=0;
396 int category_index_size=0;
398 bits_left = q->bits_per_subpacket - get_bits_count(&q->gb);
400 if(bits_left > q->samples_per_channel) {
401 bits_left = q->samples_per_channel +
402 ((bits_left - q->samples_per_channel)*5)/8;
403 //av_log(NULL, AV_LOG_ERROR, "bits_left = %d\n",bits_left);
406 memset(&exp_index1,0,102*sizeof(int));
407 memset(&exp_index2,0,102*sizeof(int));
408 memset(&tmp_categorize_array1,0,128*sizeof(int));
409 memset(&tmp_categorize_array2,0,128*sizeof(int));
414 for (i=32 ; i>0 ; i=i/2){
417 for (j=q->total_subbands ; j>0 ; j--){
418 exp_idx = (i - quant_index_table[index] + bias) / 2;
421 } else if(exp_idx >7) {
425 num_bits+=expbits_tab[exp_idx];
427 if(num_bits >= bits_left - 32){
432 /* Calculate total number of bits. */
434 for (i=0 ; i<q->total_subbands ; i++) {
435 exp_idx = (bias - quant_index_table[i]) / 2;
438 } else if(exp_idx >7) {
441 num_bits += expbits_tab[exp_idx];
442 exp_index1[i] = exp_idx;
443 exp_index2[i] = exp_idx;
445 tmpbias = bias = num_bits;
447 for (j = 1 ; j < q->numvector_size ; j++) {
448 if (tmpbias + bias > 2*bits_left) { /* ---> */
451 for (i=0 ; i<q->total_subbands ; i++){
452 if (exp_index1[i] < 7) {
453 v = (-2*exp_index1[i]) - quant_index_table[i] - 32;
461 tmp_categorize_array1[tmp_categorize_array1_idx++] = index;
462 tmpbias -= expbits_tab[exp_index1[index]] -
463 expbits_tab[exp_index1[index]+1];
468 for (i=0 ; i<q->total_subbands ; i++){
469 if(exp_index2[i] > 0){
470 v = (-2*exp_index2[i])-quant_index_table[i];
477 if(index == -1)break;
478 tmp_categorize_array2[tmp_categorize_array2_idx++] = index;
479 tmpbias -= expbits_tab[exp_index2[index]] -
480 expbits_tab[exp_index2[index]-1];
485 for(i=0 ; i<q->total_subbands ; i++)
486 category[i] = exp_index2[i];
488 /* Concatenate the two arrays. */
489 for(i=tmp_categorize_array2_idx-1 ; i >= 0; i--)
490 category_index[category_index_size++] = tmp_categorize_array2[i];
492 for(i=0;i<tmp_categorize_array1_idx;i++)
493 category_index[category_index_size++ ] = tmp_categorize_array1[i];
495 /* FIXME: mc_sich_ra8_20.rm triggers this, not sure with what we
496 should fill the remaining bytes. */
497 for(i=category_index_size;i<q->numvector_size;i++)
504 * Expand the category vector.
506 * @param q pointer to the COOKContext
507 * @param category pointer to the category array
508 * @param category_index pointer to the category_index array
511 static void inline expand_category(COOKContext *q, int* category,
512 int* category_index){
514 for(i=0 ; i<q->num_vectors ; i++){
515 ++category[category_index[i]];
520 * The real requantization of the mltcoefs
522 * @param q pointer to the COOKContext
524 * @param quant_index quantisation index
525 * @param subband_coef_index array of indexes to quant_centroid_tab
526 * @param subband_coef_sign signs of coefficients
527 * @param mlt_p pointer into the mlt buffer
530 static void scalar_dequant(COOKContext *q, int index, int quant_index,
531 int* subband_coef_index, int* subband_coef_sign,
536 for(i=0 ; i<SUBBAND_SIZE ; i++) {
537 if (subband_coef_index[i]) {
538 f1 = quant_centroid_tab[index][subband_coef_index[i]];
539 if (subband_coef_sign[i]) f1 = -f1;
541 /* noise coding if subband_coef_index[i] == 0 */
542 f1 = dither_tab[index];
543 if (av_random(&q->random_state) < 0x80000000) f1 = -f1;
545 mlt_p[i] = f1 * q->rootpow2tab[quant_index+63];
549 * Unpack the subband_coef_index and subband_coef_sign vectors.
551 * @param q pointer to the COOKContext
552 * @param category pointer to the category array
553 * @param subband_coef_index array of indexes to quant_centroid_tab
554 * @param subband_coef_sign signs of coefficients
557 static int unpack_SQVH(COOKContext *q, int category, int* subband_coef_index,
558 int* subband_coef_sign) {
560 int vlc, vd ,tmp, result;
564 vd = vd_tab[category];
566 for(i=0 ; i<vpr_tab[category] ; i++){
567 ub = get_bits_count(&q->gb);
568 vlc = get_vlc2(&q->gb, q->sqvh[category].table, q->sqvh[category].bits, 3);
569 cb = get_bits_count(&q->gb);
570 if (q->bits_per_subpacket < get_bits_count(&q->gb)){
574 for(j=vd-1 ; j>=0 ; j--){
575 tmp = (vlc * invradix_tab[category])/0x100000;
576 subband_coef_index[vd*i+j] = vlc - tmp * (kmax_tab[category]+1);
579 for(j=0 ; j<vd ; j++){
580 if (subband_coef_index[i*vd + j]) {
581 if(get_bits_count(&q->gb) < q->bits_per_subpacket){
582 subband_coef_sign[i*vd+j] = get_bits1(&q->gb);
585 subband_coef_sign[i*vd+j]=0;
588 subband_coef_sign[i*vd+j]=0;
597 * Fill the mlt_buffer with mlt coefficients.
599 * @param q pointer to the COOKContext
600 * @param category pointer to the category array
601 * @param quant_index_table pointer to the array
602 * @param mlt_buffer pointer to mlt coefficients
606 static void decode_vectors(COOKContext* q, int* category,
607 int *quant_index_table, float* mlt_buffer){
608 /* A zero in this table means that the subband coefficient is
609 random noise coded. */
610 int subband_coef_index[SUBBAND_SIZE];
611 /* A zero in this table means that the subband coefficient is a
612 positive multiplicator. */
613 int subband_coef_sign[SUBBAND_SIZE];
617 for(band=0 ; band<q->total_subbands ; band++){
618 index = category[band];
619 if(category[band] < 7){
620 if(unpack_SQVH(q, category[band], subband_coef_index, subband_coef_sign)){
622 for(j=0 ; j<q->total_subbands ; j++) category[band+j]=7;
626 memset(subband_coef_index, 0, sizeof(subband_coef_index));
627 memset(subband_coef_sign, 0, sizeof(subband_coef_sign));
629 scalar_dequant(q, index, quant_index_table[band],
630 subband_coef_index, subband_coef_sign,
631 &mlt_buffer[band * 20]);
634 if(q->total_subbands*SUBBAND_SIZE >= q->samples_per_channel){
636 } /* FIXME: should this be removed, or moved into loop above? */
641 * function for decoding mono data
643 * @param q pointer to the COOKContext
644 * @param mlt_buffer1 pointer to left channel mlt coefficients
645 * @param mlt_buffer2 pointer to right channel mlt coefficients
648 static void mono_decode(COOKContext *q, float* mlt_buffer) {
650 int category_index[128];
651 int quant_index_table[102];
654 memset(&category, 0, 128*sizeof(int));
655 memset(&category_index, 0, 128*sizeof(int));
657 decode_envelope(q, quant_index_table);
658 q->num_vectors = get_bits(&q->gb,q->log2_numvector_size);
659 categorize(q, quant_index_table, category, category_index);
660 expand_category(q, category, category_index);
661 decode_vectors(q, category, quant_index_table, mlt_buffer);
666 * the actual requantization of the timedomain samples
668 * @param q pointer to the COOKContext
669 * @param buffer pointer to the timedomain buffer
670 * @param gain_index index for the block multiplier
671 * @param gain_index_next index for the next block multiplier
674 static void interpolate(COOKContext *q, float* buffer,
675 int gain_index, int gain_index_next){
678 fc1 = q->pow2tab[gain_index+63];
680 if(gain_index == gain_index_next){ //static gain
681 for(i=0 ; i<q->gain_size_factor ; i++){
685 } else { //smooth gain
686 fc2 = q->gain_table[11 + (gain_index_next-gain_index)];
687 for(i=0 ; i<q->gain_size_factor ; i++){
697 * The modulated lapped transform, this takes transform coefficients
698 * and transforms them into timedomain samples.
699 * Apply transform window, overlap buffers, apply gain profile
700 * and buffer management.
702 * @param q pointer to the COOKContext
703 * @param inbuffer pointer to the mltcoefficients
704 * @param gains_ptr current and previous gains
705 * @param previous_buffer pointer to the previous buffer to be used for overlapping
708 static void imlt_gain(COOKContext *q, float *inbuffer,
709 cook_gains *gains_ptr, float* previous_buffer)
711 const float fc = q->pow2tab[gains_ptr->previous[0] + 63];
712 float *buffer0 = q->mono_mdct_output;
713 float *buffer1 = q->mono_mdct_output + q->samples_per_channel;
716 /* Inverse modified discrete cosine transform */
717 q->mdct_ctx.fft.imdct_calc(&q->mdct_ctx, q->mono_mdct_output,
718 inbuffer, q->mdct_tmp);
720 /* The weird thing here, is that the two halves of the time domain
721 * buffer are swapped. Also, the newest data, that we save away for
722 * next frame, has the wrong sign. Hence the subtraction below.
723 * Almost sounds like a complex conjugate/reverse data/FFT effect.
726 /* Apply window and overlap */
727 for(i = 0; i < q->samples_per_channel; i++){
728 buffer1[i] = buffer1[i] * fc * q->mlt_window[i] -
729 previous_buffer[i] * q->mlt_window[q->samples_per_channel - 1 - i];
732 /* Apply gain profile */
733 for (i = 0; i < 8; i++) {
734 if (gains_ptr->now[i] || gains_ptr->now[i + 1])
735 interpolate(q, &buffer1[q->gain_size_factor * i],
736 gains_ptr->now[i], gains_ptr->now[i + 1]);
739 /* Save away the current to be previous block. */
740 memcpy(previous_buffer, buffer0, sizeof(float)*q->samples_per_channel);
745 * function for getting the jointstereo coupling information
747 * @param q pointer to the COOKContext
748 * @param decouple_tab decoupling array
752 static void decouple_info(COOKContext *q, int* decouple_tab){
755 if(get_bits1(&q->gb)) {
756 if(cplband[q->js_subband_start] > cplband[q->subbands-1]) return;
758 length = cplband[q->subbands-1] - cplband[q->js_subband_start] + 1;
759 for (i=0 ; i<length ; i++) {
760 decouple_tab[cplband[q->js_subband_start] + i] = get_vlc2(&q->gb, q->ccpl.table, q->ccpl.bits, 2);
765 if(cplband[q->js_subband_start] > cplband[q->subbands-1]) return;
767 length = cplband[q->subbands-1] - cplband[q->js_subband_start] + 1;
768 for (i=0 ; i<length ; i++) {
769 decouple_tab[cplband[q->js_subband_start] + i] = get_bits(&q->gb, q->js_vlc_bits);
776 * function for decoding joint stereo data
778 * @param q pointer to the COOKContext
779 * @param mlt_buffer1 pointer to left channel mlt coefficients
780 * @param mlt_buffer2 pointer to right channel mlt coefficients
783 static void joint_decode(COOKContext *q, float* mlt_buffer1,
784 float* mlt_buffer2) {
786 int decouple_tab[SUBBAND_SIZE];
787 float decode_buffer[1060];
788 int idx, cpl_tmp,tmp_idx;
792 memset(decouple_tab, 0, sizeof(decouple_tab));
793 memset(decode_buffer, 0, sizeof(decode_buffer));
795 /* Make sure the buffers are zeroed out. */
796 memset(mlt_buffer1,0, 1024*sizeof(float));
797 memset(mlt_buffer2,0, 1024*sizeof(float));
798 decouple_info(q, decouple_tab);
799 mono_decode(q, decode_buffer);
801 /* The two channels are stored interleaved in decode_buffer. */
802 for (i=0 ; i<q->js_subband_start ; i++) {
803 for (j=0 ; j<SUBBAND_SIZE ; j++) {
804 mlt_buffer1[i*20+j] = decode_buffer[i*40+j];
805 mlt_buffer2[i*20+j] = decode_buffer[i*40+20+j];
809 /* When we reach js_subband_start (the higher frequencies)
810 the coefficients are stored in a coupling scheme. */
811 idx = (1 << q->js_vlc_bits) - 1;
812 for (i=q->js_subband_start ; i<q->subbands ; i++) {
813 cpl_tmp = cplband[i];
814 idx -=decouple_tab[cpl_tmp];
815 cplscale = (float*)cplscales[q->js_vlc_bits-2]; //choose decoupler table
816 f1 = cplscale[decouple_tab[cpl_tmp]];
817 f2 = cplscale[idx-1];
818 for (j=0 ; j<SUBBAND_SIZE ; j++) {
819 tmp_idx = ((q->js_subband_start + i)*20)+j;
820 mlt_buffer1[20*i + j] = f1 * decode_buffer[tmp_idx];
821 mlt_buffer2[20*i + j] = f2 * decode_buffer[tmp_idx];
823 idx = (1 << q->js_vlc_bits) - 1;
828 * First part of subpacket decoding:
829 * decode raw stream bytes and read gain info.
831 * @param q pointer to the COOKContext
832 * @param inbuffer pointer to raw stream data
833 * @param gain_ptr array of current/prev gain pointers
837 decode_bytes_and_gain(COOKContext *q, uint8_t *inbuffer,
838 cook_gains *gains_ptr)
842 offset = decode_bytes(inbuffer, q->decoded_bytes_buffer,
843 q->bits_per_subpacket/8);
844 init_get_bits(&q->gb, q->decoded_bytes_buffer + offset,
845 q->bits_per_subpacket);
846 decode_gain_info(&q->gb, gains_ptr->now);
848 /* Swap current and previous gains */
849 FFSWAP(int *, gains_ptr->now, gains_ptr->previous);
853 * Final part of subpacket decoding:
854 * Apply modulated lapped transform, gain compensation,
855 * clip and convert to integer.
857 * @param q pointer to the COOKContext
858 * @param decode_buffer pointer to the mlt coefficients
859 * @param gain_ptr array of current/prev gain pointers
860 * @param previous_buffer pointer to the previous buffer to be used for overlapping
861 * @param out pointer to the output buffer
862 * @param chan 0: left or single channel, 1: right channel
866 mlt_compensate_output(COOKContext *q, float *decode_buffer,
867 cook_gains *gains, float *previous_buffer,
868 int16_t *out, int chan)
870 float *output = q->mono_mdct_output + q->samples_per_channel;
873 imlt_gain(q, decode_buffer, gains, previous_buffer);
875 /* Clip and convert floats to 16 bits.
877 for (j = 0; j < q->samples_per_channel; j++) {
878 out[chan + q->nb_channels * j] =
879 av_clip(lrintf(output[j]), -32768, 32767);
885 * Cook subpacket decoding. This function returns one decoded subpacket,
886 * usually 1024 samples per channel.
888 * @param q pointer to the COOKContext
889 * @param inbuffer pointer to the inbuffer
890 * @param sub_packet_size subpacket size
891 * @param outbuffer pointer to the outbuffer
895 static int decode_subpacket(COOKContext *q, uint8_t *inbuffer,
896 int sub_packet_size, int16_t *outbuffer) {
898 // for (i=0 ; i<sub_packet_size ; i++) {
899 // av_log(NULL, AV_LOG_ERROR, "%02x", inbuffer[i]);
901 // av_log(NULL, AV_LOG_ERROR, "\n");
903 decode_bytes_and_gain(q, inbuffer, &q->gains1);
905 if (q->joint_stereo) {
906 joint_decode(q, q->decode_buffer_1, q->decode_buffer_2);
908 mono_decode(q, q->decode_buffer_1);
910 if (q->nb_channels == 2) {
911 decode_bytes_and_gain(q, inbuffer + sub_packet_size/2, &q->gains2);
912 mono_decode(q, q->decode_buffer_2);
916 mlt_compensate_output(q, q->decode_buffer_1, &q->gains1,
917 q->mono_previous_buffer1, outbuffer, 0);
919 if (q->nb_channels == 2) {
920 if (q->joint_stereo) {
921 mlt_compensate_output(q, q->decode_buffer_2, &q->gains1,
922 q->mono_previous_buffer2, outbuffer, 1);
924 mlt_compensate_output(q, q->decode_buffer_2, &q->gains2,
925 q->mono_previous_buffer2, outbuffer, 1);
928 return q->samples_per_frame * sizeof(int16_t);
933 * Cook frame decoding
935 * @param avctx pointer to the AVCodecContext
938 static int cook_decode_frame(AVCodecContext *avctx,
939 void *data, int *data_size,
940 uint8_t *buf, int buf_size) {
941 COOKContext *q = avctx->priv_data;
943 if (buf_size < avctx->block_align)
946 *data_size = decode_subpacket(q, buf, avctx->block_align, data);
948 /* Discard the first two frames: no valid audio. */
949 if (avctx->frame_number < 2) *data_size = 0;
951 return avctx->block_align;
955 static void dump_cook_context(COOKContext *q)
958 #define PRINT(a,b) av_log(NULL,AV_LOG_ERROR," %s = %d\n", a, b);
959 av_log(NULL,AV_LOG_ERROR,"COOKextradata\n");
960 av_log(NULL,AV_LOG_ERROR,"cookversion=%x\n",q->cookversion);
961 if (q->cookversion > STEREO) {
962 PRINT("js_subband_start",q->js_subband_start);
963 PRINT("js_vlc_bits",q->js_vlc_bits);
965 av_log(NULL,AV_LOG_ERROR,"COOKContext\n");
966 PRINT("nb_channels",q->nb_channels);
967 PRINT("bit_rate",q->bit_rate);
968 PRINT("sample_rate",q->sample_rate);
969 PRINT("samples_per_channel",q->samples_per_channel);
970 PRINT("samples_per_frame",q->samples_per_frame);
971 PRINT("subbands",q->subbands);
972 PRINT("random_state",q->random_state);
973 PRINT("js_subband_start",q->js_subband_start);
974 PRINT("log2_numvector_size",q->log2_numvector_size);
975 PRINT("numvector_size",q->numvector_size);
976 PRINT("total_subbands",q->total_subbands);
981 * Cook initialization
983 * @param avctx pointer to the AVCodecContext
986 static int cook_decode_init(AVCodecContext *avctx)
988 COOKContext *q = avctx->priv_data;
989 uint8_t *edata_ptr = avctx->extradata;
991 /* Take care of the codec specific extradata. */
992 if (avctx->extradata_size <= 0) {
993 av_log(avctx,AV_LOG_ERROR,"Necessary extradata missing!\n");
996 /* 8 for mono, 16 for stereo, ? for multichannel
997 Swap to right endianness so we don't need to care later on. */
998 av_log(avctx,AV_LOG_DEBUG,"codecdata_length=%d\n",avctx->extradata_size);
999 if (avctx->extradata_size >= 8){
1000 q->cookversion = bytestream_get_be32(&edata_ptr);
1001 q->samples_per_frame = bytestream_get_be16(&edata_ptr);
1002 q->subbands = bytestream_get_be16(&edata_ptr);
1004 if (avctx->extradata_size >= 16){
1005 bytestream_get_be32(&edata_ptr); //Unknown unused
1006 q->js_subband_start = bytestream_get_be16(&edata_ptr);
1007 q->js_vlc_bits = bytestream_get_be16(&edata_ptr);
1011 /* Take data from the AVCodecContext (RM container). */
1012 q->sample_rate = avctx->sample_rate;
1013 q->nb_channels = avctx->channels;
1014 q->bit_rate = avctx->bit_rate;
1016 /* Initialize RNG. */
1017 av_init_random(1, &q->random_state);
1019 /* Initialize extradata related variables. */
1020 q->samples_per_channel = q->samples_per_frame / q->nb_channels;
1021 q->bits_per_subpacket = avctx->block_align * 8;
1023 /* Initialize default data states. */
1024 q->log2_numvector_size = 5;
1025 q->total_subbands = q->subbands;
1027 /* Initialize version-dependent variables */
1028 av_log(NULL,AV_LOG_DEBUG,"q->cookversion=%x\n",q->cookversion);
1029 q->joint_stereo = 0;
1030 switch (q->cookversion) {
1032 if (q->nb_channels != 1) {
1033 av_log(avctx,AV_LOG_ERROR,"Container channels != 1, report sample!\n");
1036 av_log(avctx,AV_LOG_DEBUG,"MONO\n");
1039 if (q->nb_channels != 1) {
1040 q->bits_per_subpacket = q->bits_per_subpacket/2;
1042 av_log(avctx,AV_LOG_DEBUG,"STEREO\n");
1045 if (q->nb_channels != 2) {
1046 av_log(avctx,AV_LOG_ERROR,"Container channels != 2, report sample!\n");
1049 av_log(avctx,AV_LOG_DEBUG,"JOINT_STEREO\n");
1050 if (avctx->extradata_size >= 16){
1051 q->total_subbands = q->subbands + q->js_subband_start;
1052 q->joint_stereo = 1;
1054 if (q->samples_per_channel > 256) {
1055 q->log2_numvector_size = 6;
1057 if (q->samples_per_channel > 512) {
1058 q->log2_numvector_size = 7;
1062 av_log(avctx,AV_LOG_ERROR,"MC_COOK not supported!\n");
1066 av_log(avctx,AV_LOG_ERROR,"Unknown Cook version, report sample!\n");
1071 /* Initialize variable relations */
1072 q->numvector_size = (1 << q->log2_numvector_size);
1074 /* Generate tables */
1075 init_rootpow2table(q);
1079 if (init_cook_vlc_tables(q) != 0)
1083 if(avctx->block_align >= UINT_MAX/2)
1086 /* Pad the databuffer with:
1087 DECODE_BYTES_PAD1 or DECODE_BYTES_PAD2 for decode_bytes(),
1088 FF_INPUT_BUFFER_PADDING_SIZE, for the bitstreamreader. */
1089 if (q->nb_channels==2 && q->joint_stereo==0) {
1090 q->decoded_bytes_buffer =
1091 av_mallocz(avctx->block_align/2
1092 + DECODE_BYTES_PAD2(avctx->block_align/2)
1093 + FF_INPUT_BUFFER_PADDING_SIZE);
1095 q->decoded_bytes_buffer =
1096 av_mallocz(avctx->block_align
1097 + DECODE_BYTES_PAD1(avctx->block_align)
1098 + FF_INPUT_BUFFER_PADDING_SIZE);
1100 if (q->decoded_bytes_buffer == NULL)
1103 q->gains1.now = q->gain_1;
1104 q->gains1.previous = q->gain_2;
1105 q->gains2.now = q->gain_3;
1106 q->gains2.previous = q->gain_4;
1108 /* Initialize transform. */
1109 if ( init_cook_mlt(q) != 0 )
1112 /* Try to catch some obviously faulty streams, othervise it might be exploitable */
1113 if (q->total_subbands > 53) {
1114 av_log(avctx,AV_LOG_ERROR,"total_subbands > 53, report sample!\n");
1117 if (q->subbands > 50) {
1118 av_log(avctx,AV_LOG_ERROR,"subbands > 50, report sample!\n");
1121 if ((q->samples_per_channel == 256) || (q->samples_per_channel == 512) || (q->samples_per_channel == 1024)) {
1123 av_log(avctx,AV_LOG_ERROR,"unknown amount of samples_per_channel = %d, report sample!\n",q->samples_per_channel);
1126 if ((q->js_vlc_bits > 6) || (q->js_vlc_bits < 0)) {
1127 av_log(avctx,AV_LOG_ERROR,"q->js_vlc_bits = %d, only >= 0 and <= 6 allowed!\n",q->js_vlc_bits);
1132 dump_cook_context(q);
1138 AVCodec cook_decoder =
1141 .type = CODEC_TYPE_AUDIO,
1142 .id = CODEC_ID_COOK,
1143 .priv_data_size = sizeof(COOKContext),
1144 .init = cook_decode_init,
1145 .close = cook_decode_close,
1146 .decode = cook_decode_frame,