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
25 * Cook compatible decoder. Bastardization of the G.722.1 standard.
26 * This decoder handles RealNetworks, RealAudio G2 data.
27 * Cook is identified by the codec name cook in RM files.
29 * To use this decoder, a calling application must supply the extradata
30 * bytes provided from the RM container; 8+ bytes for mono streams and
31 * 16+ for stereo streams (maybe more).
33 * Codec technicalities (all this assume a buffer length of 1024):
34 * Cook works with several different techniques to achieve its compression.
35 * In the timedomain the buffer is divided into 8 pieces and quantized. If
36 * two neighboring pieces have different quantization index a smooth
37 * quantization curve is used to get a smooth overlap between the different
39 * To get to the transformdomain Cook uses a modulated lapped transform.
40 * The transform domain has 50 subbands with 20 elements each. This
41 * means only a maximum of 50*20=1000 coefficients are used out of the 1024
49 #include "libavutil/lfg.h"
50 #include "libavutil/random_seed.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
66 #define MAX_SUBPACKETS 5
79 int samples_per_frame;
83 int samples_per_channel;
84 int log2_numvector_size;
85 unsigned int channel_mask;
86 VLC ccpl; ///< channel coupling
88 int bits_per_subpacket;
91 int numvector_size; ///< 1 << log2_numvector_size;
93 float mono_previous_buffer1[1024];
94 float mono_previous_buffer2[1024];
104 typedef struct cook {
106 * The following 5 functions provide the lowlevel arithmetic on
107 * the internal audio buffers.
109 void (* scalar_dequant)(struct cook *q, int index, int quant_index,
110 int* subband_coef_index, int* subband_coef_sign,
113 void (* decouple) (struct cook *q,
117 float *decode_buffer,
118 float *mlt_buffer1, float *mlt_buffer2);
120 void (* imlt_window) (struct cook *q, float *buffer1,
121 cook_gains *gains_ptr, float *previous_buffer);
123 void (* interpolate) (struct cook *q, float* buffer,
124 int gain_index, int gain_index_next);
126 void (* saturate_output) (struct cook *q, int chan, int16_t *out);
128 AVCodecContext* avctx;
135 int samples_per_channel;
144 VLC envelope_quant_index[13];
145 VLC sqvh[7]; //scalar quantization
147 /* generatable tables and related variables */
148 int gain_size_factor;
149 float gain_table[23];
153 uint8_t* decoded_bytes_buffer;
154 DECLARE_ALIGNED(16, float,mono_mdct_output)[2048];
155 float decode_buffer_1[1024];
156 float decode_buffer_2[1024];
157 float decode_buffer_0[1060]; /* static allocation for joint decode */
159 const float *cplscales[5];
161 COOKSubpacket subpacket[MAX_SUBPACKETS];
164 static float pow2tab[127];
165 static float rootpow2tab[127];
167 /* debug functions */
170 static void dump_float_table(float* table, int size, int delimiter) {
172 av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
173 for (i=0 ; i<size ; i++) {
174 av_log(NULL, AV_LOG_ERROR, "%5.1f, ", table[i]);
175 if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
179 static void dump_int_table(int* table, int size, int delimiter) {
181 av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
182 for (i=0 ; i<size ; i++) {
183 av_log(NULL, AV_LOG_ERROR, "%d, ", table[i]);
184 if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
188 static void dump_short_table(short* table, int size, int delimiter) {
190 av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
191 for (i=0 ; i<size ; i++) {
192 av_log(NULL, AV_LOG_ERROR, "%d, ", table[i]);
193 if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
199 /*************** init functions ***************/
201 /* table generator */
202 static av_cold void init_pow2table(void){
204 for (i=-63 ; i<64 ; i++){
205 pow2tab[63+i]= pow(2, i);
206 rootpow2tab[63+i]=sqrt(pow(2, i));
210 /* table generator */
211 static av_cold void init_gain_table(COOKContext *q) {
213 q->gain_size_factor = q->samples_per_channel/8;
214 for (i=0 ; i<23 ; i++) {
215 q->gain_table[i] = pow(pow2tab[i+52] ,
216 (1.0/(double)q->gain_size_factor));
221 static av_cold int init_cook_vlc_tables(COOKContext *q) {
225 for (i=0 ; i<13 ; i++) {
226 result |= init_vlc (&q->envelope_quant_index[i], 9, 24,
227 envelope_quant_index_huffbits[i], 1, 1,
228 envelope_quant_index_huffcodes[i], 2, 2, 0);
230 av_log(q->avctx,AV_LOG_DEBUG,"sqvh VLC init\n");
231 for (i=0 ; i<7 ; i++) {
232 result |= init_vlc (&q->sqvh[i], vhvlcsize_tab[i], vhsize_tab[i],
233 cvh_huffbits[i], 1, 1,
234 cvh_huffcodes[i], 2, 2, 0);
237 for(i=0;i<q->num_subpackets;i++){
238 if (q->subpacket[i].joint_stereo==1){
239 result |= init_vlc (&q->subpacket[i].ccpl, 6, (1<<q->subpacket[i].js_vlc_bits)-1,
240 ccpl_huffbits[q->subpacket[i].js_vlc_bits-2], 1, 1,
241 ccpl_huffcodes[q->subpacket[i].js_vlc_bits-2], 2, 2, 0);
242 av_log(q->avctx,AV_LOG_DEBUG,"subpacket %i Joint-stereo VLC used.\n",i);
246 av_log(q->avctx,AV_LOG_DEBUG,"VLC tables initialized.\n");
250 static av_cold int init_cook_mlt(COOKContext *q) {
252 int mlt_size = q->samples_per_channel;
254 if ((q->mlt_window = av_malloc(sizeof(float)*mlt_size)) == 0)
257 /* Initialize the MLT window: simple sine window. */
258 ff_sine_window_init(q->mlt_window, mlt_size);
259 for(j=0 ; j<mlt_size ; j++)
260 q->mlt_window[j] *= sqrt(2.0 / q->samples_per_channel);
262 /* Initialize the MDCT. */
263 if (ff_mdct_init(&q->mdct_ctx, av_log2(mlt_size)+1, 1, 1.0)) {
264 av_free(q->mlt_window);
267 av_log(q->avctx,AV_LOG_DEBUG,"MDCT initialized, order = %d.\n",
268 av_log2(mlt_size)+1);
273 static const float *maybe_reformat_buffer32 (COOKContext *q, const float *ptr, int n)
279 static av_cold void init_cplscales_table (COOKContext *q) {
282 q->cplscales[i] = maybe_reformat_buffer32 (q, cplscales[i], (1<<(i+2))-1);
285 /*************** init functions end ***********/
288 * Cook indata decoding, every 32 bits are XORed with 0x37c511f2.
289 * Why? No idea, some checksum/error detection method maybe.
291 * Out buffer size: extra bytes are needed to cope with
292 * padding/misalignment.
293 * Subpackets passed to the decoder can contain two, consecutive
294 * half-subpackets, of identical but arbitrary size.
295 * 1234 1234 1234 1234 extraA extraB
296 * Case 1: AAAA BBBB 0 0
297 * Case 2: AAAA ABBB BB-- 3 3
298 * Case 3: AAAA AABB BBBB 2 2
299 * Case 4: AAAA AAAB BBBB BB-- 1 5
301 * Nice way to waste CPU cycles.
303 * @param inbuffer pointer to byte array of indata
304 * @param out pointer to byte array of outdata
305 * @param bytes number of bytes
307 #define DECODE_BYTES_PAD1(bytes) (3 - ((bytes)+3) % 4)
308 #define DECODE_BYTES_PAD2(bytes) ((bytes) % 4 + DECODE_BYTES_PAD1(2 * (bytes)))
310 static inline int decode_bytes(const uint8_t* inbuffer, uint8_t* out, int bytes){
314 uint32_t* obuf = (uint32_t*) out;
315 /* FIXME: 64 bit platforms would be able to do 64 bits at a time.
316 * I'm too lazy though, should be something like
317 * for(i=0 ; i<bitamount/64 ; i++)
318 * (int64_t)out[i] = 0x37c511f237c511f2^be2me_64(int64_t)in[i]);
319 * Buffer alignment needs to be checked. */
321 off = (intptr_t)inbuffer & 3;
322 buf = (const uint32_t*) (inbuffer - off);
323 c = be2me_32((0x37c511f2 >> (off*8)) | (0x37c511f2 << (32-(off*8))));
325 for (i = 0; i < bytes/4; i++)
326 obuf[i] = c ^ buf[i];
335 static av_cold int cook_decode_close(AVCodecContext *avctx)
338 COOKContext *q = avctx->priv_data;
339 av_log(avctx,AV_LOG_DEBUG, "Deallocating memory.\n");
341 /* Free allocated memory buffers. */
342 av_free(q->mlt_window);
343 av_free(q->decoded_bytes_buffer);
345 /* Free the transform. */
346 ff_mdct_end(&q->mdct_ctx);
348 /* Free the VLC tables. */
349 for (i=0 ; i<13 ; i++) {
350 free_vlc(&q->envelope_quant_index[i]);
352 for (i=0 ; i<7 ; i++) {
353 free_vlc(&q->sqvh[i]);
355 for (i=0 ; i<q->num_subpackets ; i++) {
356 free_vlc(&q->subpacket[i].ccpl);
359 av_log(avctx,AV_LOG_DEBUG,"Memory deallocated.\n");
365 * Fill the gain array for the timedomain quantization.
367 * @param q pointer to the COOKContext
368 * @param gaininfo[9] array of gain indexes
371 static void decode_gain_info(GetBitContext *gb, int *gaininfo)
375 while (get_bits1(gb)) {}
376 n = get_bits_count(gb) - 1; //amount of elements*2 to update
380 int index = get_bits(gb, 3);
381 int gain = get_bits1(gb) ? get_bits(gb, 4) - 7 : -1;
383 while (i <= index) gaininfo[i++] = gain;
385 while (i <= 8) gaininfo[i++] = 0;
389 * Create the quant index table needed for the envelope.
391 * @param q pointer to the COOKContext
392 * @param quant_index_table pointer to the array
395 static void decode_envelope(COOKContext *q, COOKSubpacket *p, int* quant_index_table) {
398 quant_index_table[0]= get_bits(&q->gb,6) - 6; //This is used later in categorize
400 for (i=1 ; i < p->total_subbands ; i++){
402 if (i >= p->js_subband_start * 2) {
403 vlc_index-=p->js_subband_start;
406 if(vlc_index < 1) vlc_index = 1;
408 if (vlc_index>13) vlc_index = 13; //the VLC tables >13 are identical to No. 13
410 j = get_vlc2(&q->gb, q->envelope_quant_index[vlc_index-1].table,
411 q->envelope_quant_index[vlc_index-1].bits,2);
412 quant_index_table[i] = quant_index_table[i-1] + j - 12; //differential encoding
417 * Calculate the category and category_index vector.
419 * @param q pointer to the COOKContext
420 * @param quant_index_table pointer to the array
421 * @param category pointer to the category array
422 * @param category_index pointer to the category_index array
425 static void categorize(COOKContext *q, COOKSubpacket *p, int* quant_index_table,
426 int* category, int* category_index){
427 int exp_idx, bias, tmpbias1, tmpbias2, bits_left, num_bits, index, v, i, j;
431 int tmp_categorize_array[128*2];
432 int tmp_categorize_array1_idx=p->numvector_size;
433 int tmp_categorize_array2_idx=p->numvector_size;
435 bits_left = p->bits_per_subpacket - get_bits_count(&q->gb);
437 if(bits_left > q->samples_per_channel) {
438 bits_left = q->samples_per_channel +
439 ((bits_left - q->samples_per_channel)*5)/8;
440 //av_log(q->avctx, AV_LOG_ERROR, "bits_left = %d\n",bits_left);
443 memset(&exp_index1,0,102*sizeof(int));
444 memset(&exp_index2,0,102*sizeof(int));
445 memset(&tmp_categorize_array,0,128*2*sizeof(int));
450 for (i=32 ; i>0 ; i=i/2){
453 for (j=p->total_subbands ; j>0 ; j--){
454 exp_idx = av_clip((i - quant_index_table[index] + bias) / 2, 0, 7);
456 num_bits+=expbits_tab[exp_idx];
458 if(num_bits >= bits_left - 32){
463 /* Calculate total number of bits. */
465 for (i=0 ; i<p->total_subbands ; i++) {
466 exp_idx = av_clip((bias - quant_index_table[i]) / 2, 0, 7);
467 num_bits += expbits_tab[exp_idx];
468 exp_index1[i] = exp_idx;
469 exp_index2[i] = exp_idx;
471 tmpbias1 = tmpbias2 = num_bits;
473 for (j = 1 ; j < p->numvector_size ; j++) {
474 if (tmpbias1 + tmpbias2 > 2*bits_left) { /* ---> */
477 for (i=0 ; i<p->total_subbands ; i++){
478 if (exp_index1[i] < 7) {
479 v = (-2*exp_index1[i]) - quant_index_table[i] + bias;
487 tmp_categorize_array[tmp_categorize_array1_idx++] = index;
488 tmpbias1 -= expbits_tab[exp_index1[index]] -
489 expbits_tab[exp_index1[index]+1];
494 for (i=0 ; i<p->total_subbands ; i++){
495 if(exp_index2[i] > 0){
496 v = (-2*exp_index2[i])-quant_index_table[i]+bias;
503 if(index == -1)break;
504 tmp_categorize_array[--tmp_categorize_array2_idx] = index;
505 tmpbias2 -= expbits_tab[exp_index2[index]] -
506 expbits_tab[exp_index2[index]-1];
511 for(i=0 ; i<p->total_subbands ; i++)
512 category[i] = exp_index2[i];
514 for(i=0 ; i<p->numvector_size-1 ; i++)
515 category_index[i] = tmp_categorize_array[tmp_categorize_array2_idx++];
521 * Expand the category vector.
523 * @param q pointer to the COOKContext
524 * @param category pointer to the category array
525 * @param category_index pointer to the category_index array
528 static inline void expand_category(COOKContext *q, int* category,
529 int* category_index){
531 for(i=0 ; i<q->num_vectors ; i++){
532 ++category[category_index[i]];
537 * The real requantization of the mltcoefs
539 * @param q pointer to the COOKContext
541 * @param quant_index quantisation index
542 * @param subband_coef_index array of indexes to quant_centroid_tab
543 * @param subband_coef_sign signs of coefficients
544 * @param mlt_p pointer into the mlt buffer
547 static void scalar_dequant_float(COOKContext *q, int index, int quant_index,
548 int* subband_coef_index, int* subband_coef_sign,
553 for(i=0 ; i<SUBBAND_SIZE ; i++) {
554 if (subband_coef_index[i]) {
555 f1 = quant_centroid_tab[index][subband_coef_index[i]];
556 if (subband_coef_sign[i]) f1 = -f1;
558 /* noise coding if subband_coef_index[i] == 0 */
559 f1 = dither_tab[index];
560 if (av_lfg_get(&q->random_state) < 0x80000000) f1 = -f1;
562 mlt_p[i] = f1 * rootpow2tab[quant_index+63];
566 * Unpack the subband_coef_index and subband_coef_sign vectors.
568 * @param q pointer to the COOKContext
569 * @param category pointer to the category array
570 * @param subband_coef_index array of indexes to quant_centroid_tab
571 * @param subband_coef_sign signs of coefficients
574 static int unpack_SQVH(COOKContext *q, COOKSubpacket *p, int category, int* subband_coef_index,
575 int* subband_coef_sign) {
577 int vlc, vd ,tmp, result;
579 vd = vd_tab[category];
581 for(i=0 ; i<vpr_tab[category] ; i++){
582 vlc = get_vlc2(&q->gb, q->sqvh[category].table, q->sqvh[category].bits, 3);
583 if (p->bits_per_subpacket < get_bits_count(&q->gb)){
587 for(j=vd-1 ; j>=0 ; j--){
588 tmp = (vlc * invradix_tab[category])/0x100000;
589 subband_coef_index[vd*i+j] = vlc - tmp * (kmax_tab[category]+1);
592 for(j=0 ; j<vd ; j++){
593 if (subband_coef_index[i*vd + j]) {
594 if(get_bits_count(&q->gb) < p->bits_per_subpacket){
595 subband_coef_sign[i*vd+j] = get_bits1(&q->gb);
598 subband_coef_sign[i*vd+j]=0;
601 subband_coef_sign[i*vd+j]=0;
610 * Fill the mlt_buffer with mlt coefficients.
612 * @param q pointer to the COOKContext
613 * @param category pointer to the category array
614 * @param quant_index_table pointer to the array
615 * @param mlt_buffer pointer to mlt coefficients
619 static void decode_vectors(COOKContext* q, COOKSubpacket* p, int* category,
620 int *quant_index_table, float* mlt_buffer){
621 /* A zero in this table means that the subband coefficient is
622 random noise coded. */
623 int subband_coef_index[SUBBAND_SIZE];
624 /* A zero in this table means that the subband coefficient is a
625 positive multiplicator. */
626 int subband_coef_sign[SUBBAND_SIZE];
630 for(band=0 ; band<p->total_subbands ; band++){
631 index = category[band];
632 if(category[band] < 7){
633 if(unpack_SQVH(q, p, category[band], subband_coef_index, subband_coef_sign)){
635 for(j=0 ; j<p->total_subbands ; j++) category[band+j]=7;
639 memset(subband_coef_index, 0, sizeof(subband_coef_index));
640 memset(subband_coef_sign, 0, sizeof(subband_coef_sign));
642 q->scalar_dequant(q, index, quant_index_table[band],
643 subband_coef_index, subband_coef_sign,
644 &mlt_buffer[band * SUBBAND_SIZE]);
647 if(p->total_subbands*SUBBAND_SIZE >= q->samples_per_channel){
649 } /* FIXME: should this be removed, or moved into loop above? */
654 * function for decoding mono data
656 * @param q pointer to the COOKContext
657 * @param mlt_buffer pointer to mlt coefficients
660 static void mono_decode(COOKContext *q, COOKSubpacket *p, float* mlt_buffer) {
662 int category_index[128];
663 int quant_index_table[102];
666 memset(&category, 0, 128*sizeof(int));
667 memset(&category_index, 0, 128*sizeof(int));
669 decode_envelope(q, p, quant_index_table);
670 q->num_vectors = get_bits(&q->gb,p->log2_numvector_size);
671 categorize(q, p, quant_index_table, category, category_index);
672 expand_category(q, category, category_index);
673 decode_vectors(q, p, category, quant_index_table, mlt_buffer);
678 * the actual requantization of the timedomain samples
680 * @param q pointer to the COOKContext
681 * @param buffer pointer to the timedomain buffer
682 * @param gain_index index for the block multiplier
683 * @param gain_index_next index for the next block multiplier
686 static void interpolate_float(COOKContext *q, float* buffer,
687 int gain_index, int gain_index_next){
690 fc1 = pow2tab[gain_index+63];
692 if(gain_index == gain_index_next){ //static gain
693 for(i=0 ; i<q->gain_size_factor ; i++){
697 } else { //smooth gain
698 fc2 = q->gain_table[11 + (gain_index_next-gain_index)];
699 for(i=0 ; i<q->gain_size_factor ; i++){
708 * Apply transform window, overlap buffers.
710 * @param q pointer to the COOKContext
711 * @param inbuffer pointer to the mltcoefficients
712 * @param gains_ptr current and previous gains
713 * @param previous_buffer pointer to the previous buffer to be used for overlapping
716 static void imlt_window_float (COOKContext *q, float *buffer1,
717 cook_gains *gains_ptr, float *previous_buffer)
719 const float fc = pow2tab[gains_ptr->previous[0] + 63];
721 /* The weird thing here, is that the two halves of the time domain
722 * buffer are swapped. Also, the newest data, that we save away for
723 * next frame, has the wrong sign. Hence the subtraction below.
724 * Almost sounds like a complex conjugate/reverse data/FFT effect.
727 /* Apply window and overlap */
728 for(i = 0; i < q->samples_per_channel; i++){
729 buffer1[i] = buffer1[i] * fc * q->mlt_window[i] -
730 previous_buffer[i] * q->mlt_window[q->samples_per_channel - 1 - i];
735 * The modulated lapped transform, this takes transform coefficients
736 * and transforms them into timedomain samples.
737 * Apply transform window, overlap buffers, apply gain profile
738 * and buffer management.
740 * @param q pointer to the COOKContext
741 * @param inbuffer pointer to the mltcoefficients
742 * @param gains_ptr current and previous gains
743 * @param previous_buffer pointer to the previous buffer to be used for overlapping
746 static void imlt_gain(COOKContext *q, float *inbuffer,
747 cook_gains *gains_ptr, float* previous_buffer)
749 float *buffer0 = q->mono_mdct_output;
750 float *buffer1 = q->mono_mdct_output + q->samples_per_channel;
753 /* Inverse modified discrete cosine transform */
754 ff_imdct_calc(&q->mdct_ctx, q->mono_mdct_output, inbuffer);
756 q->imlt_window (q, buffer1, gains_ptr, previous_buffer);
758 /* Apply gain profile */
759 for (i = 0; i < 8; i++) {
760 if (gains_ptr->now[i] || gains_ptr->now[i + 1])
761 q->interpolate(q, &buffer1[q->gain_size_factor * i],
762 gains_ptr->now[i], gains_ptr->now[i + 1]);
765 /* Save away the current to be previous block. */
766 memcpy(previous_buffer, buffer0, sizeof(float)*q->samples_per_channel);
771 * function for getting the jointstereo coupling information
773 * @param q pointer to the COOKContext
774 * @param decouple_tab decoupling array
778 static void decouple_info(COOKContext *q, COOKSubpacket *p, int* decouple_tab){
781 if(get_bits1(&q->gb)) {
782 if(cplband[p->js_subband_start] > cplband[p->subbands-1]) return;
784 length = cplband[p->subbands-1] - cplband[p->js_subband_start] + 1;
785 for (i=0 ; i<length ; i++) {
786 decouple_tab[cplband[p->js_subband_start] + i] = get_vlc2(&q->gb, p->ccpl.table, p->ccpl.bits, 2);
791 if(cplband[p->js_subband_start] > cplband[p->subbands-1]) return;
793 length = cplband[p->subbands-1] - cplband[p->js_subband_start] + 1;
794 for (i=0 ; i<length ; i++) {
795 decouple_tab[cplband[p->js_subband_start] + i] = get_bits(&q->gb, p->js_vlc_bits);
801 * function decouples a pair of signals from a single signal via multiplication.
803 * @param q pointer to the COOKContext
804 * @param subband index of the current subband
805 * @param f1 multiplier for channel 1 extraction
806 * @param f2 multiplier for channel 2 extraction
807 * @param decode_buffer input buffer
808 * @param mlt_buffer1 pointer to left channel mlt coefficients
809 * @param mlt_buffer2 pointer to right channel mlt coefficients
811 static void decouple_float (COOKContext *q,
815 float *decode_buffer,
816 float *mlt_buffer1, float *mlt_buffer2)
819 for (j=0 ; j<SUBBAND_SIZE ; j++) {
820 tmp_idx = ((p->js_subband_start + subband)*SUBBAND_SIZE)+j;
821 mlt_buffer1[SUBBAND_SIZE*subband + j] = f1 * decode_buffer[tmp_idx];
822 mlt_buffer2[SUBBAND_SIZE*subband + j] = f2 * decode_buffer[tmp_idx];
827 * function for decoding joint stereo data
829 * @param q pointer to the COOKContext
830 * @param mlt_buffer1 pointer to left channel mlt coefficients
831 * @param mlt_buffer2 pointer to right channel mlt coefficients
834 static void joint_decode(COOKContext *q, COOKSubpacket *p, float* mlt_buffer1,
835 float* mlt_buffer2) {
837 int decouple_tab[SUBBAND_SIZE];
838 float *decode_buffer = q->decode_buffer_0;
841 const float* cplscale;
843 memset(decouple_tab, 0, sizeof(decouple_tab));
844 memset(decode_buffer, 0, sizeof(decode_buffer));
846 /* Make sure the buffers are zeroed out. */
847 memset(mlt_buffer1,0, 1024*sizeof(float));
848 memset(mlt_buffer2,0, 1024*sizeof(float));
849 decouple_info(q, p, decouple_tab);
850 mono_decode(q, p, decode_buffer);
852 /* The two channels are stored interleaved in decode_buffer. */
853 for (i=0 ; i<p->js_subband_start ; i++) {
854 for (j=0 ; j<SUBBAND_SIZE ; j++) {
855 mlt_buffer1[i*20+j] = decode_buffer[i*40+j];
856 mlt_buffer2[i*20+j] = decode_buffer[i*40+20+j];
860 /* When we reach js_subband_start (the higher frequencies)
861 the coefficients are stored in a coupling scheme. */
862 idx = (1 << p->js_vlc_bits) - 1;
863 for (i=p->js_subband_start ; i<p->subbands ; i++) {
864 cpl_tmp = cplband[i];
865 idx -=decouple_tab[cpl_tmp];
866 cplscale = q->cplscales[p->js_vlc_bits-2]; //choose decoupler table
867 f1 = cplscale[decouple_tab[cpl_tmp]];
868 f2 = cplscale[idx-1];
869 q->decouple (q, p, i, f1, f2, decode_buffer, mlt_buffer1, mlt_buffer2);
870 idx = (1 << p->js_vlc_bits) - 1;
875 * First part of subpacket decoding:
876 * decode raw stream bytes and read gain info.
878 * @param q pointer to the COOKContext
879 * @param inbuffer pointer to raw stream data
880 * @param gain_ptr array of current/prev gain pointers
884 decode_bytes_and_gain(COOKContext *q, COOKSubpacket *p, const uint8_t *inbuffer,
885 cook_gains *gains_ptr)
889 offset = decode_bytes(inbuffer, q->decoded_bytes_buffer,
890 p->bits_per_subpacket/8);
891 init_get_bits(&q->gb, q->decoded_bytes_buffer + offset,
892 p->bits_per_subpacket);
893 decode_gain_info(&q->gb, gains_ptr->now);
895 /* Swap current and previous gains */
896 FFSWAP(int *, gains_ptr->now, gains_ptr->previous);
900 * Saturate the output signal to signed 16bit integers.
902 * @param q pointer to the COOKContext
903 * @param chan channel to saturate
904 * @param out pointer to the output vector
907 saturate_output_float (COOKContext *q, int chan, int16_t *out)
910 float *output = q->mono_mdct_output + q->samples_per_channel;
911 /* Clip and convert floats to 16 bits.
913 for (j = 0; j < q->samples_per_channel; j++) {
914 out[chan + q->nb_channels * j] =
915 av_clip_int16(lrintf(output[j]));
920 * Final part of subpacket decoding:
921 * Apply modulated lapped transform, gain compensation,
922 * clip and convert to integer.
924 * @param q pointer to the COOKContext
925 * @param decode_buffer pointer to the mlt coefficients
926 * @param gain_ptr array of current/prev gain pointers
927 * @param previous_buffer pointer to the previous buffer to be used for overlapping
928 * @param out pointer to the output buffer
929 * @param chan 0: left or single channel, 1: right channel
933 mlt_compensate_output(COOKContext *q, float *decode_buffer,
934 cook_gains *gains, float *previous_buffer,
935 int16_t *out, int chan)
937 imlt_gain(q, decode_buffer, gains, previous_buffer);
938 q->saturate_output (q, chan, out);
943 * Cook subpacket decoding. This function returns one decoded subpacket,
944 * usually 1024 samples per channel.
946 * @param q pointer to the COOKContext
947 * @param inbuffer pointer to the inbuffer
948 * @param sub_packet_size subpacket size
949 * @param outbuffer pointer to the outbuffer
953 static void decode_subpacket(COOKContext *q, COOKSubpacket* p, const uint8_t *inbuffer, int16_t *outbuffer) {
954 int sub_packet_size = p->size;
956 // for (i=0 ; i<sub_packet_size ; i++) {
957 // av_log(q->avctx, AV_LOG_ERROR, "%02x", inbuffer[i]);
959 // av_log(q->avctx, AV_LOG_ERROR, "\n");
960 memset(q->decode_buffer_1,0,sizeof(q->decode_buffer_1));
961 decode_bytes_and_gain(q, p, inbuffer, &p->gains1);
963 if (p->joint_stereo) {
964 joint_decode(q, p, q->decode_buffer_1, q->decode_buffer_2);
966 mono_decode(q, p, q->decode_buffer_1);
968 if (p->num_channels == 2) {
969 decode_bytes_and_gain(q, p, inbuffer + sub_packet_size/2, &p->gains2);
970 mono_decode(q, p, q->decode_buffer_2);
974 mlt_compensate_output(q, q->decode_buffer_1, &p->gains1,
975 p->mono_previous_buffer1, outbuffer, p->ch_idx);
977 if (p->num_channels == 2) {
978 if (p->joint_stereo) {
979 mlt_compensate_output(q, q->decode_buffer_2, &p->gains1,
980 p->mono_previous_buffer2, outbuffer, p->ch_idx + 1);
982 mlt_compensate_output(q, q->decode_buffer_2, &p->gains2,
983 p->mono_previous_buffer2, outbuffer, p->ch_idx + 1);
991 * Cook frame decoding
993 * @param avctx pointer to the AVCodecContext
996 static int cook_decode_frame(AVCodecContext *avctx,
997 void *data, int *data_size,
999 const uint8_t *buf = avpkt->data;
1000 int buf_size = avpkt->size;
1001 COOKContext *q = avctx->priv_data;
1006 if (buf_size < avctx->block_align)
1009 /* estimate subpacket sizes */
1010 q->subpacket[0].size = avctx->block_align;
1012 for(i=1;i<q->num_subpackets;i++){
1013 q->subpacket[i].size = 2 * buf[avctx->block_align - q->num_subpackets + i];
1014 q->subpacket[0].size -= q->subpacket[i].size + 1;
1015 if (q->subpacket[0].size < 0) {
1016 av_log(avctx,AV_LOG_DEBUG,"frame subpacket size total > avctx->block_align!\n");
1021 /* decode supbackets */
1023 for(i=0;i<q->num_subpackets;i++){
1024 q->subpacket[i].bits_per_subpacket = (q->subpacket[i].size*8)>>q->subpacket[i].bits_per_subpdiv;
1025 q->subpacket[i].ch_idx = chidx;
1026 av_log(avctx,AV_LOG_DEBUG,"subpacket[%i] size %i js %i %i block_align %i\n",i,q->subpacket[i].size,q->subpacket[i].joint_stereo,offset,avctx->block_align);
1027 decode_subpacket(q, &q->subpacket[i], buf + offset, (int16_t*)data);
1028 offset += q->subpacket[i].size;
1029 chidx += q->subpacket[i].num_channels;
1030 av_log(avctx,AV_LOG_DEBUG,"subpacket[%i] %i %i\n",i,q->subpacket[i].size * 8,get_bits_count(&q->gb));
1032 *data_size = sizeof(int16_t) * q->nb_channels * q->samples_per_channel;
1034 /* Discard the first two frames: no valid audio. */
1035 if (avctx->frame_number < 2) *data_size = 0;
1037 return avctx->block_align;
1041 static void dump_cook_context(COOKContext *q)
1044 #define PRINT(a,b) av_log(q->avctx,AV_LOG_ERROR," %s = %d\n", a, b);
1045 av_log(q->avctx,AV_LOG_ERROR,"COOKextradata\n");
1046 av_log(q->avctx,AV_LOG_ERROR,"cookversion=%x\n",q->subpacket[0].cookversion);
1047 if (q->subpacket[0].cookversion > STEREO) {
1048 PRINT("js_subband_start",q->subpacket[0].js_subband_start);
1049 PRINT("js_vlc_bits",q->subpacket[0].js_vlc_bits);
1051 av_log(q->avctx,AV_LOG_ERROR,"COOKContext\n");
1052 PRINT("nb_channels",q->nb_channels);
1053 PRINT("bit_rate",q->bit_rate);
1054 PRINT("sample_rate",q->sample_rate);
1055 PRINT("samples_per_channel",q->subpacket[0].samples_per_channel);
1056 PRINT("samples_per_frame",q->subpacket[0].samples_per_frame);
1057 PRINT("subbands",q->subpacket[0].subbands);
1058 PRINT("random_state",q->random_state);
1059 PRINT("js_subband_start",q->subpacket[0].js_subband_start);
1060 PRINT("log2_numvector_size",q->subpacket[0].log2_numvector_size);
1061 PRINT("numvector_size",q->subpacket[0].numvector_size);
1062 PRINT("total_subbands",q->subpacket[0].total_subbands);
1066 static av_cold int cook_count_channels(unsigned int mask){
1069 for(i = 0;i<32;i++){
1077 * Cook initialization
1079 * @param avctx pointer to the AVCodecContext
1082 static av_cold int cook_decode_init(AVCodecContext *avctx)
1084 COOKContext *q = avctx->priv_data;
1085 const uint8_t *edata_ptr = avctx->extradata;
1086 const uint8_t *edata_ptr_end = edata_ptr + avctx->extradata_size;
1087 int extradata_size = avctx->extradata_size;
1089 unsigned int channel_mask = 0;
1092 /* Take care of the codec specific extradata. */
1093 if (extradata_size <= 0) {
1094 av_log(avctx,AV_LOG_ERROR,"Necessary extradata missing!\n");
1097 av_log(avctx,AV_LOG_DEBUG,"codecdata_length=%d\n",avctx->extradata_size);
1099 /* Take data from the AVCodecContext (RM container). */
1100 q->sample_rate = avctx->sample_rate;
1101 q->nb_channels = avctx->channels;
1102 q->bit_rate = avctx->bit_rate;
1104 /* Initialize RNG. */
1105 av_lfg_init(&q->random_state, 0);
1107 while(edata_ptr < edata_ptr_end){
1108 /* 8 for mono, 16 for stereo, ? for multichannel
1109 Swap to right endianness so we don't need to care later on. */
1110 if (extradata_size >= 8){
1111 q->subpacket[s].cookversion = bytestream_get_be32(&edata_ptr);
1112 q->subpacket[s].samples_per_frame = bytestream_get_be16(&edata_ptr);
1113 q->subpacket[s].subbands = bytestream_get_be16(&edata_ptr);
1114 extradata_size -= 8;
1116 if (avctx->extradata_size >= 8){
1117 bytestream_get_be32(&edata_ptr); //Unknown unused
1118 q->subpacket[s].js_subband_start = bytestream_get_be16(&edata_ptr);
1119 q->subpacket[s].js_vlc_bits = bytestream_get_be16(&edata_ptr);
1120 extradata_size -= 8;
1123 /* Initialize extradata related variables. */
1124 q->subpacket[s].samples_per_channel = q->subpacket[s].samples_per_frame / q->nb_channels;
1125 q->subpacket[s].bits_per_subpacket = avctx->block_align * 8;
1127 /* Initialize default data states. */
1128 q->subpacket[s].log2_numvector_size = 5;
1129 q->subpacket[s].total_subbands = q->subpacket[s].subbands;
1130 q->subpacket[s].num_channels = 1;
1132 /* Initialize version-dependent variables */
1134 av_log(avctx,AV_LOG_DEBUG,"subpacket[%i].cookversion=%x\n",s,q->subpacket[s].cookversion);
1135 q->subpacket[s].joint_stereo = 0;
1136 switch (q->subpacket[s].cookversion) {
1138 if (q->nb_channels != 1) {
1139 av_log(avctx,AV_LOG_ERROR,"Container channels != 1, report sample!\n");
1142 av_log(avctx,AV_LOG_DEBUG,"MONO\n");
1145 if (q->nb_channels != 1) {
1146 q->subpacket[s].bits_per_subpdiv = 1;
1147 q->subpacket[s].num_channels = 2;
1149 av_log(avctx,AV_LOG_DEBUG,"STEREO\n");
1152 if (q->nb_channels != 2) {
1153 av_log(avctx,AV_LOG_ERROR,"Container channels != 2, report sample!\n");
1156 av_log(avctx,AV_LOG_DEBUG,"JOINT_STEREO\n");
1157 if (avctx->extradata_size >= 16){
1158 q->subpacket[s].total_subbands = q->subpacket[s].subbands + q->subpacket[s].js_subband_start;
1159 q->subpacket[s].joint_stereo = 1;
1160 q->subpacket[s].num_channels = 2;
1162 if (q->subpacket[s].samples_per_channel > 256) {
1163 q->subpacket[s].log2_numvector_size = 6;
1165 if (q->subpacket[s].samples_per_channel > 512) {
1166 q->subpacket[s].log2_numvector_size = 7;
1170 av_log(avctx,AV_LOG_DEBUG,"MULTI_CHANNEL\n");
1171 if(extradata_size >= 4)
1172 channel_mask |= q->subpacket[s].channel_mask = bytestream_get_be32(&edata_ptr);
1174 if(cook_count_channels(q->subpacket[s].channel_mask) > 1){
1175 q->subpacket[s].total_subbands = q->subpacket[s].subbands + q->subpacket[s].js_subband_start;
1176 q->subpacket[s].joint_stereo = 1;
1177 q->subpacket[s].num_channels = 2;
1178 q->subpacket[s].samples_per_channel = q->subpacket[s].samples_per_frame >> 1;
1180 if (q->subpacket[s].samples_per_channel > 256) {
1181 q->subpacket[s].log2_numvector_size = 6;
1183 if (q->subpacket[s].samples_per_channel > 512) {
1184 q->subpacket[s].log2_numvector_size = 7;
1187 q->subpacket[s].samples_per_channel = q->subpacket[s].samples_per_frame;
1191 av_log(avctx,AV_LOG_ERROR,"Unknown Cook version, report sample!\n");
1196 if(s > 1 && q->subpacket[s].samples_per_channel != q->samples_per_channel) {
1197 av_log(avctx,AV_LOG_ERROR,"different number of samples per channel!\n");
1200 q->samples_per_channel = q->subpacket[0].samples_per_channel;
1203 /* Initialize variable relations */
1204 q->subpacket[s].numvector_size = (1 << q->subpacket[s].log2_numvector_size);
1206 /* Try to catch some obviously faulty streams, othervise it might be exploitable */
1207 if (q->subpacket[s].total_subbands > 53) {
1208 av_log(avctx,AV_LOG_ERROR,"total_subbands > 53, report sample!\n");
1212 if ((q->subpacket[s].js_vlc_bits > 6) || (q->subpacket[s].js_vlc_bits < 0)) {
1213 av_log(avctx,AV_LOG_ERROR,"js_vlc_bits = %d, only >= 0 and <= 6 allowed!\n",q->subpacket[s].js_vlc_bits);
1217 if (q->subpacket[s].subbands > 50) {
1218 av_log(avctx,AV_LOG_ERROR,"subbands > 50, report sample!\n");
1221 q->subpacket[s].gains1.now = q->subpacket[s].gain_1;
1222 q->subpacket[s].gains1.previous = q->subpacket[s].gain_2;
1223 q->subpacket[s].gains2.now = q->subpacket[s].gain_3;
1224 q->subpacket[s].gains2.previous = q->subpacket[s].gain_4;
1226 q->num_subpackets++;
1228 if (s > MAX_SUBPACKETS) {
1229 av_log(avctx,AV_LOG_ERROR,"Too many subpackets > 5, report file!\n");
1233 /* Generate tables */
1236 init_cplscales_table(q);
1238 if (init_cook_vlc_tables(q) != 0)
1242 if(avctx->block_align >= UINT_MAX/2)
1245 /* Pad the databuffer with:
1246 DECODE_BYTES_PAD1 or DECODE_BYTES_PAD2 for decode_bytes(),
1247 FF_INPUT_BUFFER_PADDING_SIZE, for the bitstreamreader. */
1248 q->decoded_bytes_buffer =
1249 av_mallocz(avctx->block_align
1250 + DECODE_BYTES_PAD1(avctx->block_align)
1251 + FF_INPUT_BUFFER_PADDING_SIZE);
1252 if (q->decoded_bytes_buffer == NULL)
1255 /* Initialize transform. */
1256 if ( init_cook_mlt(q) != 0 )
1259 /* Initialize COOK signal arithmetic handling */
1261 q->scalar_dequant = scalar_dequant_float;
1262 q->decouple = decouple_float;
1263 q->imlt_window = imlt_window_float;
1264 q->interpolate = interpolate_float;
1265 q->saturate_output = saturate_output_float;
1268 /* Try to catch some obviously faulty streams, othervise it might be exploitable */
1269 if ((q->samples_per_channel == 256) || (q->samples_per_channel == 512) || (q->samples_per_channel == 1024)) {
1271 av_log(avctx,AV_LOG_ERROR,"unknown amount of samples_per_channel = %d, report sample!\n",q->samples_per_channel);
1275 avctx->sample_fmt = SAMPLE_FMT_S16;
1277 avctx->channel_layout = channel_mask;
1279 avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;
1282 dump_cook_context(q);
1288 AVCodec cook_decoder =
1291 .type = AVMEDIA_TYPE_AUDIO,
1292 .id = CODEC_ID_COOK,
1293 .priv_data_size = sizeof(COOKContext),
1294 .init = cook_decode_init,
1295 .close = cook_decode_close,
1296 .decode = cook_decode_frame,
1297 .long_name = NULL_IF_CONFIG_SMALL("COOK"),