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. Bastardization of the G.722.1 standard.
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) {
357 quant_index_table[0]= get_bits(&q->gb,6) - 6; //This is used later in categorize
359 for (i=1 ; i < q->total_subbands ; i++){
361 if (i >= q->js_subband_start * 2) {
362 vlc_index-=q->js_subband_start;
365 if(vlc_index < 1) vlc_index = 1;
367 if (vlc_index>13) vlc_index = 13; //the VLC tables >13 are identical to No. 13
369 j = get_vlc2(&q->gb, q->envelope_quant_index[vlc_index-1].table,
370 q->envelope_quant_index[vlc_index-1].bits,2);
371 quant_index_table[i] = quant_index_table[i-1] + j - 12; //differential encoding
376 * Calculate the category and category_index vector.
378 * @param q pointer to the COOKContext
379 * @param quant_index_table pointer to the array
380 * @param category pointer to the category array
381 * @param category_index pointer to the category_index array
384 static void categorize(COOKContext *q, int* quant_index_table,
385 int* category, int* category_index){
386 int exp_idx, bias, tmpbias, bits_left, num_bits, index, v, i, j;
390 int tmp_categorize_array1[128];
391 int tmp_categorize_array1_idx=0;
392 int tmp_categorize_array2[128];
393 int tmp_categorize_array2_idx=0;
394 int category_index_size=0;
396 bits_left = q->bits_per_subpacket - get_bits_count(&q->gb);
398 if(bits_left > q->samples_per_channel) {
399 bits_left = q->samples_per_channel +
400 ((bits_left - q->samples_per_channel)*5)/8;
401 //av_log(NULL, AV_LOG_ERROR, "bits_left = %d\n",bits_left);
404 memset(&exp_index1,0,102*sizeof(int));
405 memset(&exp_index2,0,102*sizeof(int));
406 memset(&tmp_categorize_array1,0,128*sizeof(int));
407 memset(&tmp_categorize_array2,0,128*sizeof(int));
412 for (i=32 ; i>0 ; i=i/2){
415 for (j=q->total_subbands ; j>0 ; j--){
416 exp_idx = av_clip((i - quant_index_table[index] + bias) / 2, 0, 7);
418 num_bits+=expbits_tab[exp_idx];
420 if(num_bits >= bits_left - 32){
425 /* Calculate total number of bits. */
427 for (i=0 ; i<q->total_subbands ; i++) {
428 exp_idx = av_clip((bias - quant_index_table[i]) / 2, 0, 7);
429 num_bits += expbits_tab[exp_idx];
430 exp_index1[i] = exp_idx;
431 exp_index2[i] = exp_idx;
433 tmpbias = bias = num_bits;
435 for (j = 1 ; j < q->numvector_size ; j++) {
436 if (tmpbias + bias > 2*bits_left) { /* ---> */
439 for (i=0 ; i<q->total_subbands ; i++){
440 if (exp_index1[i] < 7) {
441 v = (-2*exp_index1[i]) - quant_index_table[i] - 32;
449 tmp_categorize_array1[tmp_categorize_array1_idx++] = index;
450 tmpbias -= expbits_tab[exp_index1[index]] -
451 expbits_tab[exp_index1[index]+1];
456 for (i=0 ; i<q->total_subbands ; i++){
457 if(exp_index2[i] > 0){
458 v = (-2*exp_index2[i])-quant_index_table[i];
465 if(index == -1)break;
466 tmp_categorize_array2[tmp_categorize_array2_idx++] = index;
467 tmpbias -= expbits_tab[exp_index2[index]] -
468 expbits_tab[exp_index2[index]-1];
473 for(i=0 ; i<q->total_subbands ; i++)
474 category[i] = exp_index2[i];
476 /* Concatenate the two arrays. */
477 for(i=tmp_categorize_array2_idx-1 ; i >= 0; i--)
478 category_index[category_index_size++] = tmp_categorize_array2[i];
480 for(i=0;i<tmp_categorize_array1_idx;i++)
481 category_index[category_index_size++ ] = tmp_categorize_array1[i];
483 /* FIXME: mc_sich_ra8_20.rm triggers this, not sure with what we
484 should fill the remaining bytes. */
485 for(i=category_index_size;i<q->numvector_size;i++)
492 * Expand the category vector.
494 * @param q pointer to the COOKContext
495 * @param category pointer to the category array
496 * @param category_index pointer to the category_index array
499 static inline void expand_category(COOKContext *q, int* category,
500 int* category_index){
502 for(i=0 ; i<q->num_vectors ; i++){
503 ++category[category_index[i]];
508 * The real requantization of the mltcoefs
510 * @param q pointer to the COOKContext
512 * @param quant_index quantisation index
513 * @param subband_coef_index array of indexes to quant_centroid_tab
514 * @param subband_coef_sign signs of coefficients
515 * @param mlt_p pointer into the mlt buffer
518 static void scalar_dequant(COOKContext *q, int index, int quant_index,
519 int* subband_coef_index, int* subband_coef_sign,
524 for(i=0 ; i<SUBBAND_SIZE ; i++) {
525 if (subband_coef_index[i]) {
526 f1 = quant_centroid_tab[index][subband_coef_index[i]];
527 if (subband_coef_sign[i]) f1 = -f1;
529 /* noise coding if subband_coef_index[i] == 0 */
530 f1 = dither_tab[index];
531 if (av_random(&q->random_state) < 0x80000000) f1 = -f1;
533 mlt_p[i] = f1 * q->rootpow2tab[quant_index+63];
537 * Unpack the subband_coef_index and subband_coef_sign vectors.
539 * @param q pointer to the COOKContext
540 * @param category pointer to the category array
541 * @param subband_coef_index array of indexes to quant_centroid_tab
542 * @param subband_coef_sign signs of coefficients
545 static int unpack_SQVH(COOKContext *q, int category, int* subband_coef_index,
546 int* subband_coef_sign) {
548 int vlc, vd ,tmp, result;
550 vd = vd_tab[category];
552 for(i=0 ; i<vpr_tab[category] ; i++){
553 vlc = get_vlc2(&q->gb, q->sqvh[category].table, q->sqvh[category].bits, 3);
554 if (q->bits_per_subpacket < get_bits_count(&q->gb)){
558 for(j=vd-1 ; j>=0 ; j--){
559 tmp = (vlc * invradix_tab[category])/0x100000;
560 subband_coef_index[vd*i+j] = vlc - tmp * (kmax_tab[category]+1);
563 for(j=0 ; j<vd ; j++){
564 if (subband_coef_index[i*vd + j]) {
565 if(get_bits_count(&q->gb) < q->bits_per_subpacket){
566 subband_coef_sign[i*vd+j] = get_bits1(&q->gb);
569 subband_coef_sign[i*vd+j]=0;
572 subband_coef_sign[i*vd+j]=0;
581 * Fill the mlt_buffer with mlt coefficients.
583 * @param q pointer to the COOKContext
584 * @param category pointer to the category array
585 * @param quant_index_table pointer to the array
586 * @param mlt_buffer pointer to mlt coefficients
590 static void decode_vectors(COOKContext* q, int* category,
591 int *quant_index_table, float* mlt_buffer){
592 /* A zero in this table means that the subband coefficient is
593 random noise coded. */
594 int subband_coef_index[SUBBAND_SIZE];
595 /* A zero in this table means that the subband coefficient is a
596 positive multiplicator. */
597 int subband_coef_sign[SUBBAND_SIZE];
601 for(band=0 ; band<q->total_subbands ; band++){
602 index = category[band];
603 if(category[band] < 7){
604 if(unpack_SQVH(q, category[band], subband_coef_index, subband_coef_sign)){
606 for(j=0 ; j<q->total_subbands ; j++) category[band+j]=7;
610 memset(subband_coef_index, 0, sizeof(subband_coef_index));
611 memset(subband_coef_sign, 0, sizeof(subband_coef_sign));
613 scalar_dequant(q, index, quant_index_table[band],
614 subband_coef_index, subband_coef_sign,
615 &mlt_buffer[band * 20]);
618 if(q->total_subbands*SUBBAND_SIZE >= q->samples_per_channel){
620 } /* FIXME: should this be removed, or moved into loop above? */
625 * function for decoding mono data
627 * @param q pointer to the COOKContext
628 * @param mlt_buffer pointer to mlt coefficients
631 static void mono_decode(COOKContext *q, float* mlt_buffer) {
633 int category_index[128];
634 int quant_index_table[102];
637 memset(&category, 0, 128*sizeof(int));
638 memset(&category_index, 0, 128*sizeof(int));
640 decode_envelope(q, quant_index_table);
641 q->num_vectors = get_bits(&q->gb,q->log2_numvector_size);
642 categorize(q, quant_index_table, category, category_index);
643 expand_category(q, category, category_index);
644 decode_vectors(q, category, quant_index_table, mlt_buffer);
649 * the actual requantization of the timedomain samples
651 * @param q pointer to the COOKContext
652 * @param buffer pointer to the timedomain buffer
653 * @param gain_index index for the block multiplier
654 * @param gain_index_next index for the next block multiplier
657 static void interpolate(COOKContext *q, float* buffer,
658 int gain_index, int gain_index_next){
661 fc1 = q->pow2tab[gain_index+63];
663 if(gain_index == gain_index_next){ //static gain
664 for(i=0 ; i<q->gain_size_factor ; i++){
668 } else { //smooth gain
669 fc2 = q->gain_table[11 + (gain_index_next-gain_index)];
670 for(i=0 ; i<q->gain_size_factor ; i++){
680 * The modulated lapped transform, this takes transform coefficients
681 * and transforms them into timedomain samples.
682 * Apply transform window, overlap buffers, apply gain profile
683 * and buffer management.
685 * @param q pointer to the COOKContext
686 * @param inbuffer pointer to the mltcoefficients
687 * @param gains_ptr current and previous gains
688 * @param previous_buffer pointer to the previous buffer to be used for overlapping
691 static void imlt_gain(COOKContext *q, float *inbuffer,
692 cook_gains *gains_ptr, float* previous_buffer)
694 const float fc = q->pow2tab[gains_ptr->previous[0] + 63];
695 float *buffer0 = q->mono_mdct_output;
696 float *buffer1 = q->mono_mdct_output + q->samples_per_channel;
699 /* Inverse modified discrete cosine transform */
700 q->mdct_ctx.fft.imdct_calc(&q->mdct_ctx, q->mono_mdct_output,
701 inbuffer, q->mdct_tmp);
703 /* The weird thing here, is that the two halves of the time domain
704 * buffer are swapped. Also, the newest data, that we save away for
705 * next frame, has the wrong sign. Hence the subtraction below.
706 * Almost sounds like a complex conjugate/reverse data/FFT effect.
709 /* Apply window and overlap */
710 for(i = 0; i < q->samples_per_channel; i++){
711 buffer1[i] = buffer1[i] * fc * q->mlt_window[i] -
712 previous_buffer[i] * q->mlt_window[q->samples_per_channel - 1 - i];
715 /* Apply gain profile */
716 for (i = 0; i < 8; i++) {
717 if (gains_ptr->now[i] || gains_ptr->now[i + 1])
718 interpolate(q, &buffer1[q->gain_size_factor * i],
719 gains_ptr->now[i], gains_ptr->now[i + 1]);
722 /* Save away the current to be previous block. */
723 memcpy(previous_buffer, buffer0, sizeof(float)*q->samples_per_channel);
728 * function for getting the jointstereo coupling information
730 * @param q pointer to the COOKContext
731 * @param decouple_tab decoupling array
735 static void decouple_info(COOKContext *q, int* decouple_tab){
738 if(get_bits1(&q->gb)) {
739 if(cplband[q->js_subband_start] > cplband[q->subbands-1]) return;
741 length = cplband[q->subbands-1] - cplband[q->js_subband_start] + 1;
742 for (i=0 ; i<length ; i++) {
743 decouple_tab[cplband[q->js_subband_start] + i] = get_vlc2(&q->gb, q->ccpl.table, q->ccpl.bits, 2);
748 if(cplband[q->js_subband_start] > cplband[q->subbands-1]) return;
750 length = cplband[q->subbands-1] - cplband[q->js_subband_start] + 1;
751 for (i=0 ; i<length ; i++) {
752 decouple_tab[cplband[q->js_subband_start] + i] = get_bits(&q->gb, q->js_vlc_bits);
759 * function for decoding joint stereo data
761 * @param q pointer to the COOKContext
762 * @param mlt_buffer1 pointer to left channel mlt coefficients
763 * @param mlt_buffer2 pointer to right channel mlt coefficients
766 static void joint_decode(COOKContext *q, float* mlt_buffer1,
767 float* mlt_buffer2) {
769 int decouple_tab[SUBBAND_SIZE];
770 float decode_buffer[1060];
771 int idx, cpl_tmp,tmp_idx;
775 memset(decouple_tab, 0, sizeof(decouple_tab));
776 memset(decode_buffer, 0, sizeof(decode_buffer));
778 /* Make sure the buffers are zeroed out. */
779 memset(mlt_buffer1,0, 1024*sizeof(float));
780 memset(mlt_buffer2,0, 1024*sizeof(float));
781 decouple_info(q, decouple_tab);
782 mono_decode(q, decode_buffer);
784 /* The two channels are stored interleaved in decode_buffer. */
785 for (i=0 ; i<q->js_subband_start ; i++) {
786 for (j=0 ; j<SUBBAND_SIZE ; j++) {
787 mlt_buffer1[i*20+j] = decode_buffer[i*40+j];
788 mlt_buffer2[i*20+j] = decode_buffer[i*40+20+j];
792 /* When we reach js_subband_start (the higher frequencies)
793 the coefficients are stored in a coupling scheme. */
794 idx = (1 << q->js_vlc_bits) - 1;
795 for (i=q->js_subband_start ; i<q->subbands ; i++) {
796 cpl_tmp = cplband[i];
797 idx -=decouple_tab[cpl_tmp];
798 cplscale = (float*)cplscales[q->js_vlc_bits-2]; //choose decoupler table
799 f1 = cplscale[decouple_tab[cpl_tmp]];
800 f2 = cplscale[idx-1];
801 for (j=0 ; j<SUBBAND_SIZE ; j++) {
802 tmp_idx = ((q->js_subband_start + i)*20)+j;
803 mlt_buffer1[20*i + j] = f1 * decode_buffer[tmp_idx];
804 mlt_buffer2[20*i + j] = f2 * decode_buffer[tmp_idx];
806 idx = (1 << q->js_vlc_bits) - 1;
811 * First part of subpacket decoding:
812 * decode raw stream bytes and read gain info.
814 * @param q pointer to the COOKContext
815 * @param inbuffer pointer to raw stream data
816 * @param gain_ptr array of current/prev gain pointers
820 decode_bytes_and_gain(COOKContext *q, uint8_t *inbuffer,
821 cook_gains *gains_ptr)
825 offset = decode_bytes(inbuffer, q->decoded_bytes_buffer,
826 q->bits_per_subpacket/8);
827 init_get_bits(&q->gb, q->decoded_bytes_buffer + offset,
828 q->bits_per_subpacket);
829 decode_gain_info(&q->gb, gains_ptr->now);
831 /* Swap current and previous gains */
832 FFSWAP(int *, gains_ptr->now, gains_ptr->previous);
836 * Final part of subpacket decoding:
837 * Apply modulated lapped transform, gain compensation,
838 * clip and convert to integer.
840 * @param q pointer to the COOKContext
841 * @param decode_buffer pointer to the mlt coefficients
842 * @param gain_ptr array of current/prev gain pointers
843 * @param previous_buffer pointer to the previous buffer to be used for overlapping
844 * @param out pointer to the output buffer
845 * @param chan 0: left or single channel, 1: right channel
849 mlt_compensate_output(COOKContext *q, float *decode_buffer,
850 cook_gains *gains, float *previous_buffer,
851 int16_t *out, int chan)
853 float *output = q->mono_mdct_output + q->samples_per_channel;
856 imlt_gain(q, decode_buffer, gains, previous_buffer);
858 /* Clip and convert floats to 16 bits.
860 for (j = 0; j < q->samples_per_channel; j++) {
861 out[chan + q->nb_channels * j] =
862 av_clip(lrintf(output[j]), -32768, 32767);
868 * Cook subpacket decoding. This function returns one decoded subpacket,
869 * usually 1024 samples per channel.
871 * @param q pointer to the COOKContext
872 * @param inbuffer pointer to the inbuffer
873 * @param sub_packet_size subpacket size
874 * @param outbuffer pointer to the outbuffer
878 static int decode_subpacket(COOKContext *q, uint8_t *inbuffer,
879 int sub_packet_size, int16_t *outbuffer) {
881 // for (i=0 ; i<sub_packet_size ; i++) {
882 // av_log(NULL, AV_LOG_ERROR, "%02x", inbuffer[i]);
884 // av_log(NULL, AV_LOG_ERROR, "\n");
886 decode_bytes_and_gain(q, inbuffer, &q->gains1);
888 if (q->joint_stereo) {
889 joint_decode(q, q->decode_buffer_1, q->decode_buffer_2);
891 mono_decode(q, q->decode_buffer_1);
893 if (q->nb_channels == 2) {
894 decode_bytes_and_gain(q, inbuffer + sub_packet_size/2, &q->gains2);
895 mono_decode(q, q->decode_buffer_2);
899 mlt_compensate_output(q, q->decode_buffer_1, &q->gains1,
900 q->mono_previous_buffer1, outbuffer, 0);
902 if (q->nb_channels == 2) {
903 if (q->joint_stereo) {
904 mlt_compensate_output(q, q->decode_buffer_2, &q->gains1,
905 q->mono_previous_buffer2, outbuffer, 1);
907 mlt_compensate_output(q, q->decode_buffer_2, &q->gains2,
908 q->mono_previous_buffer2, outbuffer, 1);
911 return q->samples_per_frame * sizeof(int16_t);
916 * Cook frame decoding
918 * @param avctx pointer to the AVCodecContext
921 static int cook_decode_frame(AVCodecContext *avctx,
922 void *data, int *data_size,
923 uint8_t *buf, int buf_size) {
924 COOKContext *q = avctx->priv_data;
926 if (buf_size < avctx->block_align)
929 *data_size = decode_subpacket(q, buf, avctx->block_align, data);
931 /* Discard the first two frames: no valid audio. */
932 if (avctx->frame_number < 2) *data_size = 0;
934 return avctx->block_align;
938 static void dump_cook_context(COOKContext *q)
941 #define PRINT(a,b) av_log(NULL,AV_LOG_ERROR," %s = %d\n", a, b);
942 av_log(NULL,AV_LOG_ERROR,"COOKextradata\n");
943 av_log(NULL,AV_LOG_ERROR,"cookversion=%x\n",q->cookversion);
944 if (q->cookversion > STEREO) {
945 PRINT("js_subband_start",q->js_subband_start);
946 PRINT("js_vlc_bits",q->js_vlc_bits);
948 av_log(NULL,AV_LOG_ERROR,"COOKContext\n");
949 PRINT("nb_channels",q->nb_channels);
950 PRINT("bit_rate",q->bit_rate);
951 PRINT("sample_rate",q->sample_rate);
952 PRINT("samples_per_channel",q->samples_per_channel);
953 PRINT("samples_per_frame",q->samples_per_frame);
954 PRINT("subbands",q->subbands);
955 PRINT("random_state",q->random_state);
956 PRINT("js_subband_start",q->js_subband_start);
957 PRINT("log2_numvector_size",q->log2_numvector_size);
958 PRINT("numvector_size",q->numvector_size);
959 PRINT("total_subbands",q->total_subbands);
964 * Cook initialization
966 * @param avctx pointer to the AVCodecContext
969 static int cook_decode_init(AVCodecContext *avctx)
971 COOKContext *q = avctx->priv_data;
972 uint8_t *edata_ptr = avctx->extradata;
974 /* Take care of the codec specific extradata. */
975 if (avctx->extradata_size <= 0) {
976 av_log(avctx,AV_LOG_ERROR,"Necessary extradata missing!\n");
979 /* 8 for mono, 16 for stereo, ? for multichannel
980 Swap to right endianness so we don't need to care later on. */
981 av_log(avctx,AV_LOG_DEBUG,"codecdata_length=%d\n",avctx->extradata_size);
982 if (avctx->extradata_size >= 8){
983 q->cookversion = bytestream_get_be32(&edata_ptr);
984 q->samples_per_frame = bytestream_get_be16(&edata_ptr);
985 q->subbands = bytestream_get_be16(&edata_ptr);
987 if (avctx->extradata_size >= 16){
988 bytestream_get_be32(&edata_ptr); //Unknown unused
989 q->js_subband_start = bytestream_get_be16(&edata_ptr);
990 q->js_vlc_bits = bytestream_get_be16(&edata_ptr);
994 /* Take data from the AVCodecContext (RM container). */
995 q->sample_rate = avctx->sample_rate;
996 q->nb_channels = avctx->channels;
997 q->bit_rate = avctx->bit_rate;
999 /* Initialize RNG. */
1000 av_init_random(1, &q->random_state);
1002 /* Initialize extradata related variables. */
1003 q->samples_per_channel = q->samples_per_frame / q->nb_channels;
1004 q->bits_per_subpacket = avctx->block_align * 8;
1006 /* Initialize default data states. */
1007 q->log2_numvector_size = 5;
1008 q->total_subbands = q->subbands;
1010 /* Initialize version-dependent variables */
1011 av_log(NULL,AV_LOG_DEBUG,"q->cookversion=%x\n",q->cookversion);
1012 q->joint_stereo = 0;
1013 switch (q->cookversion) {
1015 if (q->nb_channels != 1) {
1016 av_log(avctx,AV_LOG_ERROR,"Container channels != 1, report sample!\n");
1019 av_log(avctx,AV_LOG_DEBUG,"MONO\n");
1022 if (q->nb_channels != 1) {
1023 q->bits_per_subpacket = q->bits_per_subpacket/2;
1025 av_log(avctx,AV_LOG_DEBUG,"STEREO\n");
1028 if (q->nb_channels != 2) {
1029 av_log(avctx,AV_LOG_ERROR,"Container channels != 2, report sample!\n");
1032 av_log(avctx,AV_LOG_DEBUG,"JOINT_STEREO\n");
1033 if (avctx->extradata_size >= 16){
1034 q->total_subbands = q->subbands + q->js_subband_start;
1035 q->joint_stereo = 1;
1037 if (q->samples_per_channel > 256) {
1038 q->log2_numvector_size = 6;
1040 if (q->samples_per_channel > 512) {
1041 q->log2_numvector_size = 7;
1045 av_log(avctx,AV_LOG_ERROR,"MC_COOK not supported!\n");
1049 av_log(avctx,AV_LOG_ERROR,"Unknown Cook version, report sample!\n");
1054 /* Initialize variable relations */
1055 q->numvector_size = (1 << q->log2_numvector_size);
1057 /* Generate tables */
1058 init_rootpow2table(q);
1062 if (init_cook_vlc_tables(q) != 0)
1066 if(avctx->block_align >= UINT_MAX/2)
1069 /* Pad the databuffer with:
1070 DECODE_BYTES_PAD1 or DECODE_BYTES_PAD2 for decode_bytes(),
1071 FF_INPUT_BUFFER_PADDING_SIZE, for the bitstreamreader. */
1072 if (q->nb_channels==2 && q->joint_stereo==0) {
1073 q->decoded_bytes_buffer =
1074 av_mallocz(avctx->block_align/2
1075 + DECODE_BYTES_PAD2(avctx->block_align/2)
1076 + FF_INPUT_BUFFER_PADDING_SIZE);
1078 q->decoded_bytes_buffer =
1079 av_mallocz(avctx->block_align
1080 + DECODE_BYTES_PAD1(avctx->block_align)
1081 + FF_INPUT_BUFFER_PADDING_SIZE);
1083 if (q->decoded_bytes_buffer == NULL)
1086 q->gains1.now = q->gain_1;
1087 q->gains1.previous = q->gain_2;
1088 q->gains2.now = q->gain_3;
1089 q->gains2.previous = q->gain_4;
1091 /* Initialize transform. */
1092 if ( init_cook_mlt(q) != 0 )
1095 /* Try to catch some obviously faulty streams, othervise it might be exploitable */
1096 if (q->total_subbands > 53) {
1097 av_log(avctx,AV_LOG_ERROR,"total_subbands > 53, report sample!\n");
1100 if (q->subbands > 50) {
1101 av_log(avctx,AV_LOG_ERROR,"subbands > 50, report sample!\n");
1104 if ((q->samples_per_channel == 256) || (q->samples_per_channel == 512) || (q->samples_per_channel == 1024)) {
1106 av_log(avctx,AV_LOG_ERROR,"unknown amount of samples_per_channel = %d, report sample!\n",q->samples_per_channel);
1109 if ((q->js_vlc_bits > 6) || (q->js_vlc_bits < 0)) {
1110 av_log(avctx,AV_LOG_ERROR,"q->js_vlc_bits = %d, only >= 0 and <= 6 allowed!\n",q->js_vlc_bits);
1115 dump_cook_context(q);
1121 AVCodec cook_decoder =
1124 .type = CODEC_TYPE_AUDIO,
1125 .id = CODEC_ID_COOK,
1126 .priv_data_size = sizeof(COOKContext),
1127 .init = cook_decode_init,
1128 .close = cook_decode_close,
1129 .decode = cook_decode_frame,