Statistics
| Branch: | Revision:

ffmpeg / libavcodec / cook.c @ af7d793c

History | View | Annotate | Download (38.7 KB)

1 e0f7e329 Benjamin Larsson
/*
2
 * COOK compatible decoder
3
 * Copyright (c) 2003 Sascha Sommer
4
 * Copyright (c) 2005 Benjamin Larsson
5
 *
6 b78e7197 Diego Biurrun
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9 e0f7e329 Benjamin Larsson
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11 b78e7197 Diego Biurrun
 * version 2.1 of the License, or (at your option) any later version.
12 e0f7e329 Benjamin Larsson
 *
13 b78e7197 Diego Biurrun
 * FFmpeg is distributed in the hope that it will be useful,
14 e0f7e329 Benjamin Larsson
 * 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.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19 b78e7197 Diego Biurrun
 * License along with FFmpeg; if not, write to the Free Software
20 5509bffa Diego Biurrun
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 e0f7e329 Benjamin Larsson
 */
22
23
/**
24
 * @file cook.c
25 940d8f76 Benjamin Larsson
 * Cook compatible decoder. Bastardization of the G.722.1 standard.
26 e0f7e329 Benjamin Larsson
 * This decoder handles RealNetworks, RealAudio G2 data.
27
 * Cook is identified by the codec name cook in RM files.
28
 *
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).
32
 *
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
38
 * pieces.
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
42
 * available.
43
 */
44
45
#include <math.h>
46
#include <stddef.h>
47
#include <stdio.h>
48
49
#include "avcodec.h"
50
#include "bitstream.h"
51
#include "dsputil.h"
52 862be28b Benjamin Larsson
#include "bytestream.h"
53 058ee0cf Ian Braithwaite
#include "random.h"
54 e0f7e329 Benjamin Larsson
55
#include "cookdata.h"
56
57
/* the different Cook versions */
58 d7973906 Benjamin Larsson
#define MONO            0x1000001
59
#define STEREO          0x1000002
60 e0f7e329 Benjamin Larsson
#define JOINT_STEREO    0x1000003
61
#define MC_COOK         0x2000000   //multichannel Cook, not supported
62
63
#define SUBBAND_SIZE    20
64
//#define COOKDEBUG
65
66
typedef struct {
67 d0429b4f Ian Braithwaite
    int *now;
68
    int *previous;
69
} cook_gains;
70 e0f7e329 Benjamin Larsson
71 28d997f9 Marc Hoffman
typedef struct cook {
72
    /*
73
     * The following 5 functions provide the lowlevel arithmetic on
74
     * the internal audio buffers.
75
     */
76
    void (* scalar_dequant)(struct cook *q, int index, int quant_index,
77
                            int* subband_coef_index, int* subband_coef_sign,
78
                            float* mlt_p);
79
80
    void (* decouple) (struct cook *q,
81
                       int subband,
82
                       float f1, float f2,
83
                       float *decode_buffer,
84
                       float *mlt_buffer1, float *mlt_buffer2);
85
86
    void (* imlt_window) (struct cook *q, float *buffer1,
87
                          cook_gains *gains_ptr, float *previous_buffer);
88
89
    void (* interpolate) (struct cook *q, float* buffer,
90
                          int gain_index, int gain_index_next);
91
92
    void (* saturate_output) (struct cook *q, int chan, int16_t *out);
93
94 e0f7e329 Benjamin Larsson
    GetBitContext       gb;
95
    /* stream data */
96
    int                 nb_channels;
97
    int                 joint_stereo;
98
    int                 bit_rate;
99
    int                 sample_rate;
100
    int                 samples_per_channel;
101
    int                 samples_per_frame;
102
    int                 subbands;
103 7f129a33 Benjamin Larsson
    int                 log2_numvector_size;
104
    int                 numvector_size;                //1 << log2_numvector_size;
105 e0f7e329 Benjamin Larsson
    int                 js_subband_start;
106
    int                 total_subbands;
107
    int                 num_vectors;
108
    int                 bits_per_subpacket;
109 862be28b Benjamin Larsson
    int                 cookversion;
110 e0f7e329 Benjamin Larsson
    /* states */
111 058ee0cf Ian Braithwaite
    AVRandomState       random_state;
112 e0f7e329 Benjamin Larsson
113
    /* transform data */
114 e7485bf3 Ian Braithwaite
    MDCTContext         mdct_ctx;
115
    DECLARE_ALIGNED_16(FFTSample, mdct_tmp[1024]);  /* temporary storage for imlt */
116 e0f7e329 Benjamin Larsson
    float*              mlt_window;
117
118
    /* gain buffers */
119 d0429b4f Ian Braithwaite
    cook_gains          gains1;
120
    cook_gains          gains2;
121
    int                 gain_1[9];
122
    int                 gain_2[9];
123
    int                 gain_3[9];
124
    int                 gain_4[9];
125 e0f7e329 Benjamin Larsson
126
    /* VLC data */
127
    int                 js_vlc_bits;
128
    VLC                 envelope_quant_index[13];
129
    VLC                 sqvh[7];          //scalar quantization
130
    VLC                 ccpl;             //channel coupling
131
132
    /* generatable tables and related variables */
133
    int                 gain_size_factor;
134
    float               gain_table[23];
135
    float               pow2tab[127];
136
    float               rootpow2tab[127];
137
138
    /* data buffers */
139
140
    uint8_t*            decoded_bytes_buffer;
141 dd462087 Benjamin Larsson
    DECLARE_ALIGNED_16(float,mono_mdct_output[2048]);
142 e0f7e329 Benjamin Larsson
    float               mono_previous_buffer1[1024];
143
    float               mono_previous_buffer2[1024];
144
    float               decode_buffer_1[1024];
145
    float               decode_buffer_2[1024];
146 8c9d2954 Marc Hoffman
    float               decode_buffer_0[1060]; /* static allocation for joint decode */
147 dae92b62 Marc Hoffman
148
    float               *cplscales[5];
149 e0f7e329 Benjamin Larsson
} COOKContext;
150
151
/* debug functions */
152
153
#ifdef COOKDEBUG
154
static void dump_float_table(float* table, int size, int delimiter) {
155
    int i=0;
156
    av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
157
    for (i=0 ; i<size ; i++) {
158
        av_log(NULL, AV_LOG_ERROR, "%5.1f, ", table[i]);
159
        if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
160
    }
161
}
162
163
static void dump_int_table(int* table, int size, int delimiter) {
164
    int i=0;
165
    av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
166
    for (i=0 ; i<size ; i++) {
167
        av_log(NULL, AV_LOG_ERROR, "%d, ", table[i]);
168
        if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
169
    }
170
}
171
172
static void dump_short_table(short* table, int size, int delimiter) {
173
    int i=0;
174
    av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
175
    for (i=0 ; i<size ; i++) {
176
        av_log(NULL, AV_LOG_ERROR, "%d, ", table[i]);
177
        if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
178
    }
179
}
180
181
#endif
182
183
/*************** init functions ***************/
184
185
/* table generator */
186
static void init_pow2table(COOKContext *q){
187
    int i;
188
    q->pow2tab[63] = 1.0;
189
    for (i=1 ; i<64 ; i++){
190 5c4b1b25 Alexander Strasser
        q->pow2tab[63+i]=(float)((uint64_t)1<<i);
191
        q->pow2tab[63-i]=1.0/(float)((uint64_t)1<<i);
192 e0f7e329 Benjamin Larsson
    }
193
}
194
195
/* table generator */
196
static void init_rootpow2table(COOKContext *q){
197
    int i;
198
    q->rootpow2tab[63] = 1.0;
199
    for (i=1 ; i<64 ; i++){
200 5c4b1b25 Alexander Strasser
        q->rootpow2tab[63+i]=sqrt((float)((uint64_t)1<<i));
201
        q->rootpow2tab[63-i]=sqrt(1.0/(float)((uint64_t)1<<i));
202 e0f7e329 Benjamin Larsson
    }
203
}
204
205
/* table generator */
206
static void init_gain_table(COOKContext *q) {
207
    int i;
208
    q->gain_size_factor = q->samples_per_channel/8;
209
    for (i=0 ; i<23 ; i++) {
210
        q->gain_table[i] = pow((double)q->pow2tab[i+52] ,
211
                               (1.0/(double)q->gain_size_factor));
212
    }
213
}
214
215
216
static int init_cook_vlc_tables(COOKContext *q) {
217
    int i, result;
218
219
    result = 0;
220
    for (i=0 ; i<13 ; i++) {
221 cdb59552 Ramiro Polla
        result |= init_vlc (&q->envelope_quant_index[i], 9, 24,
222 e0f7e329 Benjamin Larsson
            envelope_quant_index_huffbits[i], 1, 1,
223
            envelope_quant_index_huffcodes[i], 2, 2, 0);
224
    }
225
    av_log(NULL,AV_LOG_DEBUG,"sqvh VLC init\n");
226
    for (i=0 ; i<7 ; i++) {
227 cdb59552 Ramiro Polla
        result |= init_vlc (&q->sqvh[i], vhvlcsize_tab[i], vhsize_tab[i],
228 e0f7e329 Benjamin Larsson
            cvh_huffbits[i], 1, 1,
229
            cvh_huffcodes[i], 2, 2, 0);
230
    }
231
232
    if (q->nb_channels==2 && q->joint_stereo==1){
233 cdb59552 Ramiro Polla
        result |= init_vlc (&q->ccpl, 6, (1<<q->js_vlc_bits)-1,
234 e0f7e329 Benjamin Larsson
            ccpl_huffbits[q->js_vlc_bits-2], 1, 1,
235
            ccpl_huffcodes[q->js_vlc_bits-2], 2, 2, 0);
236
        av_log(NULL,AV_LOG_DEBUG,"Joint-stereo VLC used.\n");
237
    }
238
239
    av_log(NULL,AV_LOG_DEBUG,"VLC tables initialized.\n");
240
    return result;
241
}
242
243
static int init_cook_mlt(COOKContext *q) {
244
    int j;
245
    float alpha;
246 e7485bf3 Ian Braithwaite
    int mlt_size = q->samples_per_channel;
247 e0f7e329 Benjamin Larsson
248 e7485bf3 Ian Braithwaite
    if ((q->mlt_window = av_malloc(sizeof(float)*mlt_size)) == 0)
249
      return -1;
250 e0f7e329 Benjamin Larsson
251
    /* Initialize the MLT window: simple sine window. */
252 e7485bf3 Ian Braithwaite
    alpha = M_PI / (2.0 * (float)mlt_size);
253
    for(j=0 ; j<mlt_size ; j++)
254
        q->mlt_window[j] = sin((j + 0.5) * alpha) * sqrt(2.0 / q->samples_per_channel);
255
256
    /* Initialize the MDCT. */
257
    if (ff_mdct_init(&q->mdct_ctx, av_log2(mlt_size)+1, 1)) {
258
      av_free(q->mlt_window);
259
      return -1;
260 e0f7e329 Benjamin Larsson
    }
261 e7485bf3 Ian Braithwaite
    av_log(NULL,AV_LOG_DEBUG,"MDCT initialized, order = %d.\n",
262
           av_log2(mlt_size)+1);
263 e0f7e329 Benjamin Larsson
264 e7485bf3 Ian Braithwaite
    return 0;
265 e0f7e329 Benjamin Larsson
}
266
267 dae92b62 Marc Hoffman
static float *maybe_reformat_buffer32 (COOKContext *q, float *ptr, int n)
268
{
269
    if (1)
270
        return ptr;
271
}
272
273 af7d793c Carl Eugen Hoyos
static void init_cplscales_table (COOKContext *q) {
274 dae92b62 Marc Hoffman
    int i;
275
    for (i=0;i<5;i++)
276
        q->cplscales[i] = maybe_reformat_buffer32 (q, cplscales[i], (1<<(i+2))-1);
277
}
278
279 e0f7e329 Benjamin Larsson
/*************** init functions end ***********/
280
281
/**
282
 * Cook indata decoding, every 32 bits are XORed with 0x37c511f2.
283
 * Why? No idea, some checksum/error detection method maybe.
284 70ab75eb Benjamin Larsson
 *
285
 * Out buffer size: extra bytes are needed to cope with
286 df3a80b5 Diego Biurrun
 * padding/misalignment.
287 70ab75eb Benjamin Larsson
 * Subpackets passed to the decoder can contain two, consecutive
288
 * half-subpackets, of identical but arbitrary size.
289
 *          1234 1234 1234 1234  extraA extraB
290
 * Case 1:  AAAA BBBB              0      0
291
 * Case 2:  AAAA ABBB BB--         3      3
292
 * Case 3:  AAAA AABB BBBB         2      2
293
 * Case 4:  AAAA AAAB BBBB BB--    1      5
294
 *
295 e0f7e329 Benjamin Larsson
 * Nice way to waste CPU cycles.
296
 *
297 70ab75eb Benjamin Larsson
 * @param inbuffer  pointer to byte array of indata
298
 * @param out       pointer to byte array of outdata
299
 * @param bytes     number of bytes
300 e0f7e329 Benjamin Larsson
 */
301 70ab75eb Benjamin Larsson
#define DECODE_BYTES_PAD1(bytes) (3 - ((bytes)+3) % 4)
302
#define DECODE_BYTES_PAD2(bytes) ((bytes) % 4 + DECODE_BYTES_PAD1(2 * (bytes)))
303 e0f7e329 Benjamin Larsson
304 70ab75eb Benjamin Larsson
static inline int decode_bytes(uint8_t* inbuffer, uint8_t* out, int bytes){
305
    int i, off;
306
    uint32_t c;
307
    uint32_t* buf;
308 e0f7e329 Benjamin Larsson
    uint32_t* obuf = (uint32_t*) out;
309
    /* FIXME: 64 bit platforms would be able to do 64 bits at a time.
310
     * I'm too lazy though, should be something like
311
     * for(i=0 ; i<bitamount/64 ; i++)
312
     *     (int64_t)out[i] = 0x37c511f237c511f2^be2me_64(int64_t)in[i]);
313
     * Buffer alignment needs to be checked. */
314
315 6e584be1 Benjamin Larsson
    off = (int)((long)inbuffer & 3);
316 70ab75eb Benjamin Larsson
    buf = (uint32_t*) (inbuffer - off);
317
    c = be2me_32((0x37c511f2 >> (off*8)) | (0x37c511f2 << (32-(off*8))));
318
    bytes += 3 + off;
319
    for (i = 0; i < bytes/4; i++)
320
        obuf[i] = c ^ buf[i];
321 e0f7e329 Benjamin Larsson
322 70ab75eb Benjamin Larsson
    return off;
323 e0f7e329 Benjamin Larsson
}
324
325
/**
326
 * Cook uninit
327
 */
328
329
static int cook_decode_close(AVCodecContext *avctx)
330
{
331
    int i;
332
    COOKContext *q = avctx->priv_data;
333 162b9835 Benjamin Larsson
    av_log(avctx,AV_LOG_DEBUG, "Deallocating memory.\n");
334 e0f7e329 Benjamin Larsson
335
    /* Free allocated memory buffers. */
336
    av_free(q->mlt_window);
337
    av_free(q->decoded_bytes_buffer);
338
339
    /* Free the transform. */
340 e7485bf3 Ian Braithwaite
    ff_mdct_end(&q->mdct_ctx);
341 e0f7e329 Benjamin Larsson
342
    /* Free the VLC tables. */
343
    for (i=0 ; i<13 ; i++) {
344
        free_vlc(&q->envelope_quant_index[i]);
345
    }
346
    for (i=0 ; i<7 ; i++) {
347
        free_vlc(&q->sqvh[i]);
348
    }
349
    if(q->nb_channels==2 && q->joint_stereo==1 ){
350
        free_vlc(&q->ccpl);
351
    }
352
353
    av_log(NULL,AV_LOG_DEBUG,"Memory deallocated.\n");
354
355
    return 0;
356
}
357
358
/**
359 d0429b4f Ian Braithwaite
 * Fill the gain array for the timedomain quantization.
360 e0f7e329 Benjamin Larsson
 *
361
 * @param q                 pointer to the COOKContext
362 d0429b4f Ian Braithwaite
 * @param gaininfo[9]       array of gain indices
363 e0f7e329 Benjamin Larsson
 */
364
365 d0429b4f Ian Braithwaite
static void decode_gain_info(GetBitContext *gb, int *gaininfo)
366
{
367
    int i, n;
368 e0f7e329 Benjamin Larsson
369
    while (get_bits1(gb)) {}
370 d0429b4f Ian Braithwaite
    n = get_bits_count(gb) - 1;     //amount of elements*2 to update
371 e0f7e329 Benjamin Larsson
372 d0429b4f Ian Braithwaite
    i = 0;
373
    while (n--) {
374
        int index = get_bits(gb, 3);
375
        int gain = get_bits1(gb) ? get_bits(gb, 4) - 7 : -1;
376 e0f7e329 Benjamin Larsson
377 d0429b4f Ian Braithwaite
        while (i <= index) gaininfo[i++] = gain;
378 e0f7e329 Benjamin Larsson
    }
379 d0429b4f Ian Braithwaite
    while (i <= 8) gaininfo[i++] = 0;
380 e0f7e329 Benjamin Larsson
}
381
382
/**
383
 * Create the quant index table needed for the envelope.
384
 *
385
 * @param q                 pointer to the COOKContext
386
 * @param quant_index_table pointer to the array
387
 */
388
389
static void decode_envelope(COOKContext *q, int* quant_index_table) {
390
    int i,j, vlc_index;
391
392
    quant_index_table[0]= get_bits(&q->gb,6) - 6;       //This is used later in categorize
393
394
    for (i=1 ; i < q->total_subbands ; i++){
395
        vlc_index=i;
396
        if (i >= q->js_subband_start * 2) {
397
            vlc_index-=q->js_subband_start;
398
        } else {
399
            vlc_index/=2;
400
            if(vlc_index < 1) vlc_index = 1;
401
        }
402
        if (vlc_index>13) vlc_index = 13;           //the VLC tables >13 are identical to No. 13
403
404
        j = get_vlc2(&q->gb, q->envelope_quant_index[vlc_index-1].table,
405
                     q->envelope_quant_index[vlc_index-1].bits,2);
406
        quant_index_table[i] = quant_index_table[i-1] + j - 12;    //differential encoding
407
    }
408
}
409
410
/**
411
 * Calculate the category and category_index vector.
412
 *
413
 * @param q                     pointer to the COOKContext
414
 * @param quant_index_table     pointer to the array
415
 * @param category              pointer to the category array
416
 * @param category_index        pointer to the category_index array
417
 */
418
419
static void categorize(COOKContext *q, int* quant_index_table,
420
                       int* category, int* category_index){
421 6b019970 Ramiro Polla
    int exp_idx, bias, tmpbias1, tmpbias2, bits_left, num_bits, index, v, i, j;
422 e0f7e329 Benjamin Larsson
    int exp_index2[102];
423
    int exp_index1[102];
424
425 de8e2c1d Ramiro Polla
    int tmp_categorize_array[128*2];
426
    int tmp_categorize_array1_idx=q->numvector_size;
427
    int tmp_categorize_array2_idx=q->numvector_size;
428 e0f7e329 Benjamin Larsson
429
    bits_left =  q->bits_per_subpacket - get_bits_count(&q->gb);
430
431
    if(bits_left > q->samples_per_channel) {
432
        bits_left = q->samples_per_channel +
433
                    ((bits_left - q->samples_per_channel)*5)/8;
434
        //av_log(NULL, AV_LOG_ERROR, "bits_left = %d\n",bits_left);
435
    }
436
437
    memset(&exp_index1,0,102*sizeof(int));
438
    memset(&exp_index2,0,102*sizeof(int));
439 de8e2c1d Ramiro Polla
    memset(&tmp_categorize_array,0,128*2*sizeof(int));
440 e0f7e329 Benjamin Larsson
441
    bias=-32;
442
443
    /* Estimate bias. */
444
    for (i=32 ; i>0 ; i=i/2){
445
        num_bits = 0;
446
        index = 0;
447
        for (j=q->total_subbands ; j>0 ; j--){
448 a31978e9 Ramiro Polla
            exp_idx = av_clip((i - quant_index_table[index] + bias) / 2, 0, 7);
449 e0f7e329 Benjamin Larsson
            index++;
450
            num_bits+=expbits_tab[exp_idx];
451
        }
452
        if(num_bits >= bits_left - 32){
453
            bias+=i;
454
        }
455
    }
456
457
    /* Calculate total number of bits. */
458
    num_bits=0;
459
    for (i=0 ; i<q->total_subbands ; i++) {
460 a31978e9 Ramiro Polla
        exp_idx = av_clip((bias - quant_index_table[i]) / 2, 0, 7);
461 e0f7e329 Benjamin Larsson
        num_bits += expbits_tab[exp_idx];
462
        exp_index1[i] = exp_idx;
463
        exp_index2[i] = exp_idx;
464
    }
465 6b019970 Ramiro Polla
    tmpbias1 = tmpbias2 = num_bits;
466 e0f7e329 Benjamin Larsson
467
    for (j = 1 ; j < q->numvector_size ; j++) {
468 6b019970 Ramiro Polla
        if (tmpbias1 + tmpbias2 > 2*bits_left) {  /* ---> */
469 e0f7e329 Benjamin Larsson
            int max = -999999;
470
            index=-1;
471
            for (i=0 ; i<q->total_subbands ; i++){
472
                if (exp_index1[i] < 7) {
473 a5cb1f13 Ramiro Polla
                    v = (-2*exp_index1[i]) - quant_index_table[i] + bias;
474 e0f7e329 Benjamin Larsson
                    if ( v >= max) {
475
                        max = v;
476
                        index = i;
477
                    }
478
                }
479
            }
480
            if(index==-1)break;
481 de8e2c1d Ramiro Polla
            tmp_categorize_array[tmp_categorize_array1_idx++] = index;
482 6b019970 Ramiro Polla
            tmpbias1 -= expbits_tab[exp_index1[index]] -
483 39938968 Ramiro Polla
                        expbits_tab[exp_index1[index]+1];
484 e0f7e329 Benjamin Larsson
            ++exp_index1[index];
485
        } else {  /* <--- */
486
            int min = 999999;
487
            index=-1;
488
            for (i=0 ; i<q->total_subbands ; i++){
489
                if(exp_index2[i] > 0){
490 a5cb1f13 Ramiro Polla
                    v = (-2*exp_index2[i])-quant_index_table[i]+bias;
491 e0f7e329 Benjamin Larsson
                    if ( v < min) {
492
                        min = v;
493
                        index = i;
494
                    }
495
                }
496
            }
497
            if(index == -1)break;
498 de8e2c1d Ramiro Polla
            tmp_categorize_array[--tmp_categorize_array2_idx] = index;
499 6b019970 Ramiro Polla
            tmpbias2 -= expbits_tab[exp_index2[index]] -
500 39938968 Ramiro Polla
                        expbits_tab[exp_index2[index]-1];
501 e0f7e329 Benjamin Larsson
            --exp_index2[index];
502
        }
503
    }
504
505
    for(i=0 ; i<q->total_subbands ; i++)
506
        category[i] = exp_index2[i];
507
508 de8e2c1d Ramiro Polla
    for(i=0 ; i<q->numvector_size-1 ; i++)
509
        category_index[i] = tmp_categorize_array[tmp_categorize_array2_idx++];
510 e0f7e329 Benjamin Larsson
511
}
512
513
514
/**
515
 * Expand the category vector.
516
 *
517
 * @param q                     pointer to the COOKContext
518
 * @param category              pointer to the category array
519
 * @param category_index        pointer to the category_index array
520
 */
521
522 5a6a6cc7 Diego Biurrun
static inline void expand_category(COOKContext *q, int* category,
523 e0f7e329 Benjamin Larsson
                                   int* category_index){
524
    int i;
525
    for(i=0 ; i<q->num_vectors ; i++){
526
        ++category[category_index[i]];
527
    }
528
}
529
530
/**
531
 * The real requantization of the mltcoefs
532
 *
533
 * @param q                     pointer to the COOKContext
534
 * @param index                 index
535 058ee0cf Ian Braithwaite
 * @param quant_index           quantisation index
536 e0f7e329 Benjamin Larsson
 * @param subband_coef_index    array of indexes to quant_centroid_tab
537 baab2957 Ian Braithwaite
 * @param subband_coef_sign     signs of coefficients
538 058ee0cf Ian Braithwaite
 * @param mlt_p                 pointer into the mlt buffer
539 e0f7e329 Benjamin Larsson
 */
540
541 b5f3f2b8 Marc Hoffman
static void scalar_dequant_float(COOKContext *q, int index, int quant_index,
542 058ee0cf Ian Braithwaite
                           int* subband_coef_index, int* subband_coef_sign,
543
                           float* mlt_p){
544 e0f7e329 Benjamin Larsson
    int i;
545
    float f1;
546
547
    for(i=0 ; i<SUBBAND_SIZE ; i++) {
548
        if (subband_coef_index[i]) {
549 058ee0cf Ian Braithwaite
            f1 = quant_centroid_tab[index][subband_coef_index[i]];
550
            if (subband_coef_sign[i]) f1 = -f1;
551 e0f7e329 Benjamin Larsson
        } else {
552 baab2957 Ian Braithwaite
            /* noise coding if subband_coef_index[i] == 0 */
553 058ee0cf Ian Braithwaite
            f1 = dither_tab[index];
554
            if (av_random(&q->random_state) < 0x80000000) f1 = -f1;
555 e0f7e329 Benjamin Larsson
        }
556 058ee0cf Ian Braithwaite
        mlt_p[i] = f1 * q->rootpow2tab[quant_index+63];
557 e0f7e329 Benjamin Larsson
    }
558
}
559
/**
560 baab2957 Ian Braithwaite
 * Unpack the subband_coef_index and subband_coef_sign vectors.
561 e0f7e329 Benjamin Larsson
 *
562
 * @param q                     pointer to the COOKContext
563
 * @param category              pointer to the category array
564
 * @param subband_coef_index    array of indexes to quant_centroid_tab
565 baab2957 Ian Braithwaite
 * @param subband_coef_sign     signs of coefficients
566 e0f7e329 Benjamin Larsson
 */
567
568
static int unpack_SQVH(COOKContext *q, int category, int* subband_coef_index,
569 baab2957 Ian Braithwaite
                       int* subband_coef_sign) {
570 e0f7e329 Benjamin Larsson
    int i,j;
571
    int vlc, vd ,tmp, result;
572
573
    vd = vd_tab[category];
574
    result = 0;
575
    for(i=0 ; i<vpr_tab[category] ; i++){
576
        vlc = get_vlc2(&q->gb, q->sqvh[category].table, q->sqvh[category].bits, 3);
577
        if (q->bits_per_subpacket < get_bits_count(&q->gb)){
578
            vlc = 0;
579
            result = 1;
580
        }
581
        for(j=vd-1 ; j>=0 ; j--){
582
            tmp = (vlc * invradix_tab[category])/0x100000;
583
            subband_coef_index[vd*i+j] = vlc - tmp * (kmax_tab[category]+1);
584
            vlc = tmp;
585
        }
586
        for(j=0 ; j<vd ; j++){
587
            if (subband_coef_index[i*vd + j]) {
588
                if(get_bits_count(&q->gb) < q->bits_per_subpacket){
589 baab2957 Ian Braithwaite
                    subband_coef_sign[i*vd+j] = get_bits1(&q->gb);
590 e0f7e329 Benjamin Larsson
                } else {
591
                    result=1;
592 baab2957 Ian Braithwaite
                    subband_coef_sign[i*vd+j]=0;
593 e0f7e329 Benjamin Larsson
                }
594
            } else {
595 baab2957 Ian Braithwaite
                subband_coef_sign[i*vd+j]=0;
596 e0f7e329 Benjamin Larsson
            }
597
        }
598
    }
599
    return result;
600
}
601
602
603
/**
604
 * Fill the mlt_buffer with mlt coefficients.
605
 *
606
 * @param q                 pointer to the COOKContext
607
 * @param category          pointer to the category array
608 058ee0cf Ian Braithwaite
 * @param quant_index_table pointer to the array
609 e0f7e329 Benjamin Larsson
 * @param mlt_buffer        pointer to mlt coefficients
610
 */
611
612
613
static void decode_vectors(COOKContext* q, int* category,
614 058ee0cf Ian Braithwaite
                           int *quant_index_table, float* mlt_buffer){
615 e0f7e329 Benjamin Larsson
    /* A zero in this table means that the subband coefficient is
616
       random noise coded. */
617 baab2957 Ian Braithwaite
    int subband_coef_index[SUBBAND_SIZE];
618 e0f7e329 Benjamin Larsson
    /* A zero in this table means that the subband coefficient is a
619
       positive multiplicator. */
620 baab2957 Ian Braithwaite
    int subband_coef_sign[SUBBAND_SIZE];
621 e0f7e329 Benjamin Larsson
    int band, j;
622
    int index=0;
623
624
    for(band=0 ; band<q->total_subbands ; band++){
625
        index = category[band];
626
        if(category[band] < 7){
627 baab2957 Ian Braithwaite
            if(unpack_SQVH(q, category[band], subband_coef_index, subband_coef_sign)){
628 e0f7e329 Benjamin Larsson
                index=7;
629
                for(j=0 ; j<q->total_subbands ; j++) category[band+j]=7;
630
            }
631
        }
632
        if(index==7) {
633
            memset(subband_coef_index, 0, sizeof(subband_coef_index));
634 baab2957 Ian Braithwaite
            memset(subband_coef_sign, 0, sizeof(subband_coef_sign));
635 e0f7e329 Benjamin Larsson
        }
636 28d997f9 Marc Hoffman
        q->scalar_dequant(q, index, quant_index_table[band],
637 f1639f69 Marc Hoffman
                          subband_coef_index, subband_coef_sign,
638
                          &mlt_buffer[band * SUBBAND_SIZE]);
639 e0f7e329 Benjamin Larsson
    }
640
641
    if(q->total_subbands*SUBBAND_SIZE >= q->samples_per_channel){
642
        return;
643 baab2957 Ian Braithwaite
    } /* FIXME: should this be removed, or moved into loop above? */
644 e0f7e329 Benjamin Larsson
}
645
646
647
/**
648
 * function for decoding mono data
649
 *
650
 * @param q                 pointer to the COOKContext
651 b707cbb3 Ramiro Polla
 * @param mlt_buffer        pointer to mlt coefficients
652 e0f7e329 Benjamin Larsson
 */
653
654
static void mono_decode(COOKContext *q, float* mlt_buffer) {
655
656
    int category_index[128];
657
    int quant_index_table[102];
658
    int category[128];
659
660
    memset(&category, 0, 128*sizeof(int));
661
    memset(&category_index, 0, 128*sizeof(int));
662
663
    decode_envelope(q, quant_index_table);
664 7f129a33 Benjamin Larsson
    q->num_vectors = get_bits(&q->gb,q->log2_numvector_size);
665 e0f7e329 Benjamin Larsson
    categorize(q, quant_index_table, category, category_index);
666
    expand_category(q, category, category_index);
667 058ee0cf Ian Braithwaite
    decode_vectors(q, category, quant_index_table, mlt_buffer);
668 e0f7e329 Benjamin Larsson
}
669
670
671
/**
672
 * the actual requantization of the timedomain samples
673
 *
674
 * @param q                 pointer to the COOKContext
675
 * @param buffer            pointer to the timedomain buffer
676
 * @param gain_index        index for the block multiplier
677
 * @param gain_index_next   index for the next block multiplier
678
 */
679
680 b5f3f2b8 Marc Hoffman
static void interpolate_float(COOKContext *q, float* buffer,
681 e0f7e329 Benjamin Larsson
                        int gain_index, int gain_index_next){
682
    int i;
683
    float fc1, fc2;
684
    fc1 = q->pow2tab[gain_index+63];
685
686
    if(gain_index == gain_index_next){              //static gain
687
        for(i=0 ; i<q->gain_size_factor ; i++){
688
            buffer[i]*=fc1;
689
        }
690
        return;
691
    } else {                                        //smooth gain
692
        fc2 = q->gain_table[11 + (gain_index_next-gain_index)];
693
        for(i=0 ; i<q->gain_size_factor ; i++){
694
            buffer[i]*=fc1;
695
            fc1*=fc2;
696
        }
697
        return;
698
    }
699
}
700
701 e66442f4 Marc Hoffman
/**
702
 * Apply transform window, overlap buffers.
703
 *
704
 * @param q                 pointer to the COOKContext
705
 * @param inbuffer          pointer to the mltcoefficients
706
 * @param gains_ptr         current and previous gains
707
 * @param previous_buffer   pointer to the previous buffer to be used for overlapping
708
 */
709
710
static void imlt_window_float (COOKContext *q, float *buffer1,
711
                               cook_gains *gains_ptr, float *previous_buffer)
712
{
713
    const float fc = q->pow2tab[gains_ptr->previous[0] + 63];
714
    int i;
715
    /* The weird thing here, is that the two halves of the time domain
716
     * buffer are swapped. Also, the newest data, that we save away for
717
     * next frame, has the wrong sign. Hence the subtraction below.
718
     * Almost sounds like a complex conjugate/reverse data/FFT effect.
719
     */
720
721
    /* Apply window and overlap */
722
    for(i = 0; i < q->samples_per_channel; i++){
723
        buffer1[i] = buffer1[i] * fc * q->mlt_window[i] -
724
          previous_buffer[i] * q->mlt_window[q->samples_per_channel - 1 - i];
725
    }
726
}
727 e0f7e329 Benjamin Larsson
728
/**
729 85e7386a Ian Braithwaite
 * The modulated lapped transform, this takes transform coefficients
730
 * and transforms them into timedomain samples.
731
 * Apply transform window, overlap buffers, apply gain profile
732
 * and buffer management.
733 e0f7e329 Benjamin Larsson
 *
734
 * @param q                 pointer to the COOKContext
735 85e7386a Ian Braithwaite
 * @param inbuffer          pointer to the mltcoefficients
736 d0429b4f Ian Braithwaite
 * @param gains_ptr         current and previous gains
737 e0f7e329 Benjamin Larsson
 * @param previous_buffer   pointer to the previous buffer to be used for overlapping
738
 */
739
740 85e7386a Ian Braithwaite
static void imlt_gain(COOKContext *q, float *inbuffer,
741
                      cook_gains *gains_ptr, float* previous_buffer)
742 d0429b4f Ian Braithwaite
{
743 85e7386a Ian Braithwaite
    float *buffer0 = q->mono_mdct_output;
744
    float *buffer1 = q->mono_mdct_output + q->samples_per_channel;
745 e0f7e329 Benjamin Larsson
    int i;
746
747 85e7386a Ian Braithwaite
    /* Inverse modified discrete cosine transform */
748
    q->mdct_ctx.fft.imdct_calc(&q->mdct_ctx, q->mono_mdct_output,
749
                               inbuffer, q->mdct_tmp);
750
751 28d997f9 Marc Hoffman
    q->imlt_window (q, buffer1, gains_ptr, previous_buffer);
752 d0429b4f Ian Braithwaite
753
    /* Apply gain profile */
754
    for (i = 0; i < 8; i++) {
755
        if (gains_ptr->now[i] || gains_ptr->now[i + 1])
756 28d997f9 Marc Hoffman
            q->interpolate(q, &buffer1[q->gain_size_factor * i],
757 f1639f69 Marc Hoffman
                           gains_ptr->now[i], gains_ptr->now[i + 1]);
758 d0429b4f Ian Braithwaite
    }
759 e0f7e329 Benjamin Larsson
760
    /* Save away the current to be previous block. */
761 85e7386a Ian Braithwaite
    memcpy(previous_buffer, buffer0, sizeof(float)*q->samples_per_channel);
762 e0f7e329 Benjamin Larsson
}
763
764
765
/**
766
 * function for getting the jointstereo coupling information
767
 *
768
 * @param q                 pointer to the COOKContext
769
 * @param decouple_tab      decoupling array
770
 *
771
 */
772
773
static void decouple_info(COOKContext *q, int* decouple_tab){
774
    int length, i;
775
776
    if(get_bits1(&q->gb)) {
777
        if(cplband[q->js_subband_start] > cplband[q->subbands-1]) return;
778
779
        length = cplband[q->subbands-1] - cplband[q->js_subband_start] + 1;
780
        for (i=0 ; i<length ; i++) {
781
            decouple_tab[cplband[q->js_subband_start] + i] = get_vlc2(&q->gb, q->ccpl.table, q->ccpl.bits, 2);
782
        }
783
        return;
784
    }
785
786
    if(cplband[q->js_subband_start] > cplband[q->subbands-1]) return;
787
788
    length = cplband[q->subbands-1] - cplband[q->js_subband_start] + 1;
789
    for (i=0 ; i<length ; i++) {
790
       decouple_tab[cplband[q->js_subband_start] + i] = get_bits(&q->gb, q->js_vlc_bits);
791
    }
792
    return;
793
}
794
795 dc0c20f9 Marc Hoffman
/*
796
 * function decouples a pair of signals from a single signal via multiplication.
797
 *
798
 * @param q                 pointer to the COOKContext
799
 * @param subband           index of the current subband
800
 * @param f1                multiplier for channel 1 extraction
801
 * @param f2                multiplier for channel 2 extraction
802
 * @param decode_buffer     input buffer
803
 * @param mlt_buffer1       pointer to left channel mlt coefficients
804
 * @param mlt_buffer2       pointer to right channel mlt coefficients
805
 */
806
static void decouple_float (COOKContext *q,
807
                            int subband,
808
                            float f1, float f2,
809
                            float *decode_buffer,
810
                            float *mlt_buffer1, float *mlt_buffer2)
811
{
812
    int j, tmp_idx;
813
    for (j=0 ; j<SUBBAND_SIZE ; j++) {
814
        tmp_idx = ((q->js_subband_start + subband)*SUBBAND_SIZE)+j;
815
        mlt_buffer1[SUBBAND_SIZE*subband + j] = f1 * decode_buffer[tmp_idx];
816
        mlt_buffer2[SUBBAND_SIZE*subband + j] = f2 * decode_buffer[tmp_idx];
817
    }
818
}
819 e0f7e329 Benjamin Larsson
820
/**
821
 * function for decoding joint stereo data
822
 *
823
 * @param q                 pointer to the COOKContext
824
 * @param mlt_buffer1       pointer to left channel mlt coefficients
825
 * @param mlt_buffer2       pointer to right channel mlt coefficients
826
 */
827
828
static void joint_decode(COOKContext *q, float* mlt_buffer1,
829
                         float* mlt_buffer2) {
830
    int i,j;
831
    int decouple_tab[SUBBAND_SIZE];
832 8c9d2954 Marc Hoffman
    float *decode_buffer = q->decode_buffer_0;
833 31991973 Diego Biurrun
    int idx, cpl_tmp;
834 e0f7e329 Benjamin Larsson
    float f1,f2;
835
    float* cplscale;
836
837
    memset(decouple_tab, 0, sizeof(decouple_tab));
838
    memset(decode_buffer, 0, sizeof(decode_buffer));
839
840
    /* Make sure the buffers are zeroed out. */
841
    memset(mlt_buffer1,0, 1024*sizeof(float));
842
    memset(mlt_buffer2,0, 1024*sizeof(float));
843
    decouple_info(q, decouple_tab);
844
    mono_decode(q, decode_buffer);
845
846
    /* The two channels are stored interleaved in decode_buffer. */
847
    for (i=0 ; i<q->js_subband_start ; i++) {
848
        for (j=0 ; j<SUBBAND_SIZE ; j++) {
849
            mlt_buffer1[i*20+j] = decode_buffer[i*40+j];
850
            mlt_buffer2[i*20+j] = decode_buffer[i*40+20+j];
851
        }
852
    }
853
854
    /* When we reach js_subband_start (the higher frequencies)
855
       the coefficients are stored in a coupling scheme. */
856
    idx = (1 << q->js_vlc_bits) - 1;
857 70220035 Benjamin Larsson
    for (i=q->js_subband_start ; i<q->subbands ; i++) {
858
        cpl_tmp = cplband[i];
859
        idx -=decouple_tab[cpl_tmp];
860 dae92b62 Marc Hoffman
        cplscale = q->cplscales[q->js_vlc_bits-2];  //choose decoupler table
861 70220035 Benjamin Larsson
        f1 = cplscale[decouple_tab[cpl_tmp]];
862
        f2 = cplscale[idx-1];
863 28d997f9 Marc Hoffman
        q->decouple (q, i, f1, f2, decode_buffer, mlt_buffer1, mlt_buffer2);
864 70220035 Benjamin Larsson
        idx = (1 << q->js_vlc_bits) - 1;
865 e0f7e329 Benjamin Larsson
    }
866
}
867
868
/**
869 70ab75eb Benjamin Larsson
 * First part of subpacket decoding:
870
 *  decode raw stream bytes and read gain info.
871
 *
872
 * @param q                 pointer to the COOKContext
873
 * @param inbuffer          pointer to raw stream data
874
 * @param gain_ptr          array of current/prev gain pointers
875
 */
876
877
static inline void
878 a5b8a69c Benjamin Larsson
decode_bytes_and_gain(COOKContext *q, uint8_t *inbuffer,
879 d0429b4f Ian Braithwaite
                      cook_gains *gains_ptr)
880 70ab75eb Benjamin Larsson
{
881
    int offset;
882
883
    offset = decode_bytes(inbuffer, q->decoded_bytes_buffer,
884
                          q->bits_per_subpacket/8);
885
    init_get_bits(&q->gb, q->decoded_bytes_buffer + offset,
886
                  q->bits_per_subpacket);
887 d0429b4f Ian Braithwaite
    decode_gain_info(&q->gb, gains_ptr->now);
888 a5b8a69c Benjamin Larsson
889
    /* Swap current and previous gains */
890 d0429b4f Ian Braithwaite
    FFSWAP(int *, gains_ptr->now, gains_ptr->previous);
891 a5b8a69c Benjamin Larsson
}
892
893 29b4b835 Marc Hoffman
 /**
894
 * Saturate the output signal to signed 16bit integers.
895
 *
896
 * @param q                 pointer to the COOKContext
897
 * @param chan              channel to saturate
898
 * @param out               pointer to the output vector
899
 */
900
static void
901
saturate_output_float (COOKContext *q, int chan, int16_t *out)
902
{
903
    int j;
904 f999b63c Marc Hoffman
    float *output = q->mono_mdct_output + q->samples_per_channel;
905 29b4b835 Marc Hoffman
    /* Clip and convert floats to 16 bits.
906
     */
907
    for (j = 0; j < q->samples_per_channel; j++) {
908
        out[chan + q->nb_channels * j] =
909
          av_clip(lrintf(output[j]), -32768, 32767);
910
    }
911
}
912
913 a5b8a69c Benjamin Larsson
/**
914
 * Final part of subpacket decoding:
915
 *  Apply modulated lapped transform, gain compensation,
916
 *  clip and convert to integer.
917
 *
918
 * @param q                 pointer to the COOKContext
919
 * @param decode_buffer     pointer to the mlt coefficients
920
 * @param gain_ptr          array of current/prev gain pointers
921
 * @param previous_buffer   pointer to the previous buffer to be used for overlapping
922
 * @param out               pointer to the output buffer
923
 * @param chan              0: left or single channel, 1: right channel
924
 */
925
926
static inline void
927
mlt_compensate_output(COOKContext *q, float *decode_buffer,
928 d0429b4f Ian Braithwaite
                      cook_gains *gains, float *previous_buffer,
929 a5b8a69c Benjamin Larsson
                      int16_t *out, int chan)
930
{
931 85e7386a Ian Braithwaite
    imlt_gain(q, decode_buffer, gains, previous_buffer);
932 28d997f9 Marc Hoffman
    q->saturate_output (q, chan, out);
933 70ab75eb Benjamin Larsson
}
934
935
936
/**
937 e0f7e329 Benjamin Larsson
 * Cook subpacket decoding. This function returns one decoded subpacket,
938
 * usually 1024 samples per channel.
939
 *
940
 * @param q                 pointer to the COOKContext
941
 * @param inbuffer          pointer to the inbuffer
942
 * @param sub_packet_size   subpacket size
943
 * @param outbuffer         pointer to the outbuffer
944
 */
945
946
947
static int decode_subpacket(COOKContext *q, uint8_t *inbuffer,
948
                            int sub_packet_size, int16_t *outbuffer) {
949
    /* packet dump */
950
//    for (i=0 ; i<sub_packet_size ; i++) {
951
//        av_log(NULL, AV_LOG_ERROR, "%02x", inbuffer[i]);
952
//    }
953
//    av_log(NULL, AV_LOG_ERROR, "\n");
954
955 d0429b4f Ian Braithwaite
    decode_bytes_and_gain(q, inbuffer, &q->gains1);
956 70ab75eb Benjamin Larsson
957 a5b8a69c Benjamin Larsson
    if (q->joint_stereo) {
958
        joint_decode(q, q->decode_buffer_1, q->decode_buffer_2);
959
    } else {
960
        mono_decode(q, q->decode_buffer_1);
961 b7c24ff6 Benjamin Larsson
962 a5b8a69c Benjamin Larsson
        if (q->nb_channels == 2) {
963 d0429b4f Ian Braithwaite
            decode_bytes_and_gain(q, inbuffer + sub_packet_size/2, &q->gains2);
964 a5b8a69c Benjamin Larsson
            mono_decode(q, q->decode_buffer_2);
965
        }
966
    }
967 560b10a6 Benjamin Larsson
968 d0429b4f Ian Braithwaite
    mlt_compensate_output(q, q->decode_buffer_1, &q->gains1,
969 a5b8a69c Benjamin Larsson
                          q->mono_previous_buffer1, outbuffer, 0);
970 b7c24ff6 Benjamin Larsson
971 a5b8a69c Benjamin Larsson
    if (q->nb_channels == 2) {
972
        if (q->joint_stereo) {
973 d0429b4f Ian Braithwaite
            mlt_compensate_output(q, q->decode_buffer_2, &q->gains1,
974 a5b8a69c Benjamin Larsson
                                  q->mono_previous_buffer2, outbuffer, 1);
975
        } else {
976 d0429b4f Ian Braithwaite
            mlt_compensate_output(q, q->decode_buffer_2, &q->gains2,
977 a5b8a69c Benjamin Larsson
                                  q->mono_previous_buffer2, outbuffer, 1);
978 e0f7e329 Benjamin Larsson
        }
979
    }
980 b7c24ff6 Benjamin Larsson
    return q->samples_per_frame * sizeof(int16_t);
981 e0f7e329 Benjamin Larsson
}
982
983
984
/**
985
 * Cook frame decoding
986
 *
987
 * @param avctx     pointer to the AVCodecContext
988
 */
989
990
static int cook_decode_frame(AVCodecContext *avctx,
991
            void *data, int *data_size,
992
            uint8_t *buf, int buf_size) {
993
    COOKContext *q = avctx->priv_data;
994
995
    if (buf_size < avctx->block_align)
996
        return buf_size;
997
998
    *data_size = decode_subpacket(q, buf, avctx->block_align, data);
999
1000 4ff5e656 Ian Braithwaite
    /* Discard the first two frames: no valid audio. */
1001
    if (avctx->frame_number < 2) *data_size = 0;
1002
1003 e0f7e329 Benjamin Larsson
    return avctx->block_align;
1004
}
1005 7f129a33 Benjamin Larsson
1006 e0f7e329 Benjamin Larsson
#ifdef COOKDEBUG
1007 862be28b Benjamin Larsson
static void dump_cook_context(COOKContext *q)
1008 e0f7e329 Benjamin Larsson
{
1009
    //int i=0;
1010
#define PRINT(a,b) av_log(NULL,AV_LOG_ERROR," %s = %d\n", a, b);
1011
    av_log(NULL,AV_LOG_ERROR,"COOKextradata\n");
1012 862be28b Benjamin Larsson
    av_log(NULL,AV_LOG_ERROR,"cookversion=%x\n",q->cookversion);
1013
    if (q->cookversion > STEREO) {
1014
        PRINT("js_subband_start",q->js_subband_start);
1015
        PRINT("js_vlc_bits",q->js_vlc_bits);
1016 e0f7e329 Benjamin Larsson
    }
1017
    av_log(NULL,AV_LOG_ERROR,"COOKContext\n");
1018
    PRINT("nb_channels",q->nb_channels);
1019
    PRINT("bit_rate",q->bit_rate);
1020
    PRINT("sample_rate",q->sample_rate);
1021
    PRINT("samples_per_channel",q->samples_per_channel);
1022
    PRINT("samples_per_frame",q->samples_per_frame);
1023
    PRINT("subbands",q->subbands);
1024
    PRINT("random_state",q->random_state);
1025
    PRINT("js_subband_start",q->js_subband_start);
1026 7f129a33 Benjamin Larsson
    PRINT("log2_numvector_size",q->log2_numvector_size);
1027 e0f7e329 Benjamin Larsson
    PRINT("numvector_size",q->numvector_size);
1028
    PRINT("total_subbands",q->total_subbands);
1029
}
1030
#endif
1031 7f129a33 Benjamin Larsson
1032 e0f7e329 Benjamin Larsson
/**
1033
 * Cook initialization
1034
 *
1035
 * @param avctx     pointer to the AVCodecContext
1036
 */
1037
1038
static int cook_decode_init(AVCodecContext *avctx)
1039
{
1040
    COOKContext *q = avctx->priv_data;
1041 862be28b Benjamin Larsson
    uint8_t *edata_ptr = avctx->extradata;
1042 e0f7e329 Benjamin Larsson
1043
    /* Take care of the codec specific extradata. */
1044
    if (avctx->extradata_size <= 0) {
1045 162b9835 Benjamin Larsson
        av_log(avctx,AV_LOG_ERROR,"Necessary extradata missing!\n");
1046 e0f7e329 Benjamin Larsson
        return -1;
1047
    } else {
1048
        /* 8 for mono, 16 for stereo, ? for multichannel
1049
           Swap to right endianness so we don't need to care later on. */
1050 162b9835 Benjamin Larsson
        av_log(avctx,AV_LOG_DEBUG,"codecdata_length=%d\n",avctx->extradata_size);
1051 e0f7e329 Benjamin Larsson
        if (avctx->extradata_size >= 8){
1052 dd462087 Benjamin Larsson
            q->cookversion = bytestream_get_be32(&edata_ptr);
1053
            q->samples_per_frame =  bytestream_get_be16(&edata_ptr);
1054
            q->subbands = bytestream_get_be16(&edata_ptr);
1055 e0f7e329 Benjamin Larsson
        }
1056
        if (avctx->extradata_size >= 16){
1057 dd462087 Benjamin Larsson
            bytestream_get_be32(&edata_ptr);    //Unknown unused
1058
            q->js_subband_start = bytestream_get_be16(&edata_ptr);
1059
            q->js_vlc_bits = bytestream_get_be16(&edata_ptr);
1060 e0f7e329 Benjamin Larsson
        }
1061
    }
1062
1063
    /* Take data from the AVCodecContext (RM container). */
1064
    q->sample_rate = avctx->sample_rate;
1065
    q->nb_channels = avctx->channels;
1066
    q->bit_rate = avctx->bit_rate;
1067
1068 058ee0cf Ian Braithwaite
    /* Initialize RNG. */
1069
    av_init_random(1, &q->random_state);
1070 e0f7e329 Benjamin Larsson
1071
    /* Initialize extradata related variables. */
1072 862be28b Benjamin Larsson
    q->samples_per_channel = q->samples_per_frame / q->nb_channels;
1073 e0f7e329 Benjamin Larsson
    q->bits_per_subpacket = avctx->block_align * 8;
1074
1075
    /* Initialize default data states. */
1076 7f129a33 Benjamin Larsson
    q->log2_numvector_size = 5;
1077 e0f7e329 Benjamin Larsson
    q->total_subbands = q->subbands;
1078
1079
    /* Initialize version-dependent variables */
1080 862be28b Benjamin Larsson
    av_log(NULL,AV_LOG_DEBUG,"q->cookversion=%x\n",q->cookversion);
1081 a5b8a69c Benjamin Larsson
    q->joint_stereo = 0;
1082 862be28b Benjamin Larsson
    switch (q->cookversion) {
1083 d7973906 Benjamin Larsson
        case MONO:
1084 e0f7e329 Benjamin Larsson
            if (q->nb_channels != 1) {
1085 162b9835 Benjamin Larsson
                av_log(avctx,AV_LOG_ERROR,"Container channels != 1, report sample!\n");
1086 e0f7e329 Benjamin Larsson
                return -1;
1087
            }
1088 d7973906 Benjamin Larsson
            av_log(avctx,AV_LOG_DEBUG,"MONO\n");
1089 e0f7e329 Benjamin Larsson
            break;
1090 d7973906 Benjamin Larsson
        case STEREO:
1091 e0f7e329 Benjamin Larsson
            if (q->nb_channels != 1) {
1092 b7c24ff6 Benjamin Larsson
                q->bits_per_subpacket = q->bits_per_subpacket/2;
1093 e0f7e329 Benjamin Larsson
            }
1094 d7973906 Benjamin Larsson
            av_log(avctx,AV_LOG_DEBUG,"STEREO\n");
1095 e0f7e329 Benjamin Larsson
            break;
1096
        case JOINT_STEREO:
1097
            if (q->nb_channels != 2) {
1098 162b9835 Benjamin Larsson
                av_log(avctx,AV_LOG_ERROR,"Container channels != 2, report sample!\n");
1099 e0f7e329 Benjamin Larsson
                return -1;
1100
            }
1101 162b9835 Benjamin Larsson
            av_log(avctx,AV_LOG_DEBUG,"JOINT_STEREO\n");
1102 e0f7e329 Benjamin Larsson
            if (avctx->extradata_size >= 16){
1103 862be28b Benjamin Larsson
                q->total_subbands = q->subbands + q->js_subband_start;
1104 e0f7e329 Benjamin Larsson
                q->joint_stereo = 1;
1105
            }
1106
            if (q->samples_per_channel > 256) {
1107 2e9c78d3 Benjamin Larsson
                q->log2_numvector_size  = 6;
1108 e0f7e329 Benjamin Larsson
            }
1109
            if (q->samples_per_channel > 512) {
1110 2e9c78d3 Benjamin Larsson
                q->log2_numvector_size  = 7;
1111 e0f7e329 Benjamin Larsson
            }
1112
            break;
1113
        case MC_COOK:
1114 162b9835 Benjamin Larsson
            av_log(avctx,AV_LOG_ERROR,"MC_COOK not supported!\n");
1115 e0f7e329 Benjamin Larsson
            return -1;
1116
            break;
1117
        default:
1118 162b9835 Benjamin Larsson
            av_log(avctx,AV_LOG_ERROR,"Unknown Cook version, report sample!\n");
1119 e0f7e329 Benjamin Larsson
            return -1;
1120
            break;
1121
    }
1122
1123
    /* Initialize variable relations */
1124 7f129a33 Benjamin Larsson
    q->numvector_size = (1 << q->log2_numvector_size);
1125 e0f7e329 Benjamin Larsson
1126
    /* Generate tables */
1127
    init_rootpow2table(q);
1128
    init_pow2table(q);
1129
    init_gain_table(q);
1130 dae92b62 Marc Hoffman
    init_cplscales_table(q);
1131 e0f7e329 Benjamin Larsson
1132
    if (init_cook_vlc_tables(q) != 0)
1133
        return -1;
1134
1135 3a1a7e32 Michael Niedermayer
1136
    if(avctx->block_align >= UINT_MAX/2)
1137
        return -1;
1138
1139 70ab75eb Benjamin Larsson
    /* Pad the databuffer with:
1140
       DECODE_BYTES_PAD1 or DECODE_BYTES_PAD2 for decode_bytes(),
1141
       FF_INPUT_BUFFER_PADDING_SIZE, for the bitstreamreader. */
1142
    if (q->nb_channels==2 && q->joint_stereo==0) {
1143
        q->decoded_bytes_buffer =
1144
          av_mallocz(avctx->block_align/2
1145
                     + DECODE_BYTES_PAD2(avctx->block_align/2)
1146
                     + FF_INPUT_BUFFER_PADDING_SIZE);
1147
    } else {
1148
        q->decoded_bytes_buffer =
1149
          av_mallocz(avctx->block_align
1150
                     + DECODE_BYTES_PAD1(avctx->block_align)
1151
                     + FF_INPUT_BUFFER_PADDING_SIZE);
1152
    }
1153
    if (q->decoded_bytes_buffer == NULL)
1154 e0f7e329 Benjamin Larsson
        return -1;
1155
1156 d0429b4f Ian Braithwaite
    q->gains1.now      = q->gain_1;
1157
    q->gains1.previous = q->gain_2;
1158
    q->gains2.now      = q->gain_3;
1159
    q->gains2.previous = q->gain_4;
1160 e0f7e329 Benjamin Larsson
1161
    /* Initialize transform. */
1162 e7485bf3 Ian Braithwaite
    if ( init_cook_mlt(q) != 0 )
1163 e0f7e329 Benjamin Larsson
        return -1;
1164 560b10a6 Benjamin Larsson
1165 28d997f9 Marc Hoffman
    /* Initialize COOK signal arithmetic handling */
1166
    if (1) {
1167 b5f3f2b8 Marc Hoffman
        q->scalar_dequant  = scalar_dequant_float;
1168 28d997f9 Marc Hoffman
        q->decouple        = decouple_float;
1169
        q->imlt_window     = imlt_window_float;
1170 b5f3f2b8 Marc Hoffman
        q->interpolate     = interpolate_float;
1171 28d997f9 Marc Hoffman
        q->saturate_output = saturate_output_float;
1172
    }
1173
1174 560b10a6 Benjamin Larsson
    /* Try to catch some obviously faulty streams, othervise it might be exploitable */
1175
    if (q->total_subbands > 53) {
1176 162b9835 Benjamin Larsson
        av_log(avctx,AV_LOG_ERROR,"total_subbands > 53, report sample!\n");
1177 560b10a6 Benjamin Larsson
        return -1;
1178
    }
1179
    if (q->subbands > 50) {
1180 162b9835 Benjamin Larsson
        av_log(avctx,AV_LOG_ERROR,"subbands > 50, report sample!\n");
1181 560b10a6 Benjamin Larsson
        return -1;
1182
    }
1183 2e9c78d3 Benjamin Larsson
    if ((q->samples_per_channel == 256) || (q->samples_per_channel == 512) || (q->samples_per_channel == 1024)) {
1184
    } else {
1185 162b9835 Benjamin Larsson
        av_log(avctx,AV_LOG_ERROR,"unknown amount of samples_per_channel = %d, report sample!\n",q->samples_per_channel);
1186 2e9c78d3 Benjamin Larsson
        return -1;
1187
    }
1188 753c9d32 Benjamin Larsson
    if ((q->js_vlc_bits > 6) || (q->js_vlc_bits < 0)) {
1189
        av_log(avctx,AV_LOG_ERROR,"q->js_vlc_bits = %d, only >= 0 and <= 6 allowed!\n",q->js_vlc_bits);
1190
        return -1;
1191
    }
1192 560b10a6 Benjamin Larsson
1193 70220035 Benjamin Larsson
#ifdef COOKDEBUG
1194 862be28b Benjamin Larsson
    dump_cook_context(q);
1195 70220035 Benjamin Larsson
#endif
1196 e0f7e329 Benjamin Larsson
    return 0;
1197
}
1198
1199
1200
AVCodec cook_decoder =
1201
{
1202
    .name = "cook",
1203
    .type = CODEC_TYPE_AUDIO,
1204
    .id = CODEC_ID_COOK,
1205
    .priv_data_size = sizeof(COOKContext),
1206
    .init = cook_decode_init,
1207
    .close = cook_decode_close,
1208
    .decode = cook_decode_frame,
1209
};