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ffmpeg / libavcodec / wavpack.c @ 11ead90e

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1
/*
2
 * WavPack lossless audio decoder
3
 * Copyright (c) 2006 Konstantin Shishkov
4
 *
5
 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#define ALT_BITSTREAM_READER_LE
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#include "avcodec.h"
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#include "bitstream.h"
24

    
25
/**
26
 * @file wavpack.c
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 * WavPack lossless audio decoder
28
 */
29

    
30
#define WV_JOINT_STEREO 0x00000010
31

    
32
enum WP_ID_Flags{
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    WP_IDF_MASK   = 0x1F,
34
    WP_IDF_IGNORE = 0x20,
35
    WP_IDF_ODD    = 0x40,
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    WP_IDF_LONG   = 0x80
37
};
38

    
39
enum WP_ID{
40
    WP_ID_DUMMY = 0,
41
    WP_ID_ENCINFO,
42
    WP_ID_DECTERMS,
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    WP_ID_DECWEIGHTS,
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    WP_ID_DECSAMPLES,
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    WP_ID_ENTROPY,
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    WP_ID_HYBRID,
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    WP_ID_SHAPING,
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    WP_ID_FLOATINFO,
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    WP_ID_INT32INFO,
50
    WP_ID_DATA,
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    WP_ID_CORR,
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    WP_ID_FLT,
53
    WP_ID_CHANINFO
54
};
55

    
56
#define MAX_TERMS 16
57

    
58
typedef struct Decorr {
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    int delta;
60
    int value;
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    int weightA;
62
    int weightB;
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    int samplesA[8];
64
    int samplesB[8];
65
} Decorr;
66

    
67
typedef struct WavpackContext {
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    AVCodecContext *avctx;
69
    int stereo;
70
    int joint;
71
    uint32_t CRC;
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    GetBitContext gb;
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    int data_size; // in bits
74
    int samples;
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    int median[6];
76
    int terms;
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    Decorr decorr[MAX_TERMS];
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    int zero, one, zeroes;
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    int and, or, shift;
80
} WavpackContext;
81

    
82
// exponent table copied from WavPack source
83
static const uint8_t wp_exp2_table [256] = {
84
    0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0b,
85
    0x0b, 0x0c, 0x0d, 0x0e, 0x0e, 0x0f, 0x10, 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x15, 0x16, 0x16,
86
    0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21, 0x22, 0x23,
87
    0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
88
    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3a, 0x3b, 0x3c, 0x3d,
89
    0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b,
90
    0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,
91
    0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
92
    0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
93
    0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a,
94
    0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,
95
    0x9c, 0x9d, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad,
96
    0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0,
97
    0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc8, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf, 0xd0, 0xd2, 0xd3, 0xd4,
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    0xd6, 0xd7, 0xd8, 0xd9, 0xdb, 0xdc, 0xdd, 0xde, 0xe0, 0xe1, 0xe2, 0xe4, 0xe5, 0xe6, 0xe8, 0xe9,
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    0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff
100
};
101

    
102
static av_always_inline int wp_exp2(int16_t val)
103
{
104
    int res, neg = 0;
105

    
106
    if(val < 0){
107
        val = -val;
108
        neg = 1;
109
    }
110

    
111
    res = wp_exp2_table[val & 0xFF] | 0x100;
112
    val >>= 8;
113
    res = (val > 9) ? (res << (val - 9)) : (res >> (9 - val));
114
    return neg ? -res : res;
115
}
116

    
117
// macros for manipulating median values
118
#define GET_MED(n) ((median[n] >> 4) + 1)
119
#define DEC_MED(n) median[n] -= ((median[n] + (128>>n) - 2) / (128>>n)) * 2
120
#define INC_MED(n) median[n] += ((median[n] + (128>>n)) / (128>>n)) * 5
121

    
122
// macros for applying weight
123
#define UPDATE_WEIGHT_CLIP(weight, delta, samples, in) \
124
        if(samples && in){ \
125
            if((samples ^ in) < 0){ \
126
                weight -= delta; \
127
                if(weight < -1024) weight = -1024; \
128
            }else{ \
129
                weight += delta; \
130
                if(weight > 1024) weight = 1024; \
131
            } \
132
        }
133

    
134

    
135
static av_always_inline int get_tail(GetBitContext *gb, int k)
136
{
137
    int p, e, res;
138

    
139
    if(k<1)return 0;
140
    p = av_log2(k);
141
    e = (1 << (p + 1)) - k - 1;
142
    res = p ? get_bits(gb, p) : 0;
143
    if(res >= e){
144
        res = (res<<1) - e + get_bits1(gb);
145
    }
146
    return res;
147
}
148

    
149
static int wv_get_value(WavpackContext *ctx, GetBitContext *gb, int *median, int *last)
150
{
151
    int t, t2;
152
    int sign, base, add, ret;
153

    
154
    *last = 0;
155

    
156
    if((ctx->median[0] < 2U) && (ctx->median[3] < 2U) && !ctx->zero && !ctx->one){
157
        if(ctx->zeroes){
158
            ctx->zeroes--;
159
            if(ctx->zeroes)
160
                return 0;
161
        }else{
162
            t = get_unary(gb, 0, 33);
163
            if(t >= 2) t = get_bits(gb, t - 1) | (1 << (t-1));
164
            ctx->zeroes = t;
165
            if(ctx->zeroes){
166
                memset(ctx->median, 0, sizeof(ctx->median));
167
                return 0;
168
            }
169
        }
170
    }
171

    
172
    if(get_bits_count(gb) >= ctx->data_size){
173
        *last = 1;
174
        return 0;
175
    }
176

    
177
    if(ctx->zero){
178
        t = 0;
179
        ctx->zero = 0;
180
    }else{
181
        t = get_unary(gb, 0, 33);
182
        if(get_bits_count(gb) >= ctx->data_size){
183
            *last = 1;
184
            return 0;
185
        }
186
        if(t == 16) {
187
            t2 = get_unary(gb, 0, 33);
188
            if(t2 < 2) t += t2;
189
            else t += get_bits(gb, t2 - 1) | (1 << (t2 - 1));
190
        }
191

    
192
        if(ctx->one){
193
            ctx->one = t&1;
194
            t = (t>>1) + 1;
195
        }else{
196
            ctx->one = t&1;
197
            t >>= 1;
198
        }
199
        ctx->zero = !ctx->one;
200
    }
201

    
202
    if(!t){
203
        base = 0;
204
        add = GET_MED(0) - 1;
205
        DEC_MED(0);
206
    }else if(t == 1){
207
        base = GET_MED(0);
208
        add = GET_MED(1) - 1;
209
        INC_MED(0);
210
        DEC_MED(1);
211
    }else if(t == 2){
212
        base = GET_MED(0) + GET_MED(1);
213
        add = GET_MED(2) - 1;
214
        INC_MED(0);
215
        INC_MED(1);
216
        DEC_MED(2);
217
    }else{
218
        base = GET_MED(0) + GET_MED(1) + GET_MED(2) * (t - 2);
219
        add = GET_MED(2) - 1;
220
        INC_MED(0);
221
        INC_MED(1);
222
        INC_MED(2);
223
    }
224
    ret = base + get_tail(gb, add);
225
    sign = get_bits1(gb);
226
    return sign ? ~ret : ret;
227
}
228

    
229
static int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, int16_t *dst)
230
{
231
    int i, j, count = 0;
232
    int last, t;
233
    int A, B, L, L2, R, R2, bit;
234
    int pos = 0;
235
    uint32_t crc = 0xFFFFFFFF;
236

    
237
    s->one = s->zero = s->zeroes = 0;
238
    do{
239
        L = wv_get_value(s, gb, s->median, &last);
240
        if(last) break;
241
        R = wv_get_value(s, gb, s->median + 3, &last);
242
        if(last) break;
243
        for(i = 0; i < s->terms; i++){
244
            t = s->decorr[i].value;
245
            j = 0;
246
            if(t > 0){
247
                if(t > 8){
248
                    if(t & 1){
249
                        A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
250
                        B = 2 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1];
251
                    }else{
252
                        A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
253
                        B = (3 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1]) >> 1;
254
                    }
255
                    s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
256
                    s->decorr[i].samplesB[1] = s->decorr[i].samplesB[0];
257
                    j = 0;
258
                }else{
259
                    A = s->decorr[i].samplesA[pos];
260
                    B = s->decorr[i].samplesB[pos];
261
                    j = (pos + t) & 7;
262
                }
263
                L2 = L + ((s->decorr[i].weightA * A + 512) >> 10);
264
                R2 = R + ((s->decorr[i].weightB * B + 512) >> 10);
265
                if(A && L) s->decorr[i].weightA -= ((((L ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
266
                if(B && R) s->decorr[i].weightB -= ((((R ^ B) >> 30) & 2) - 1) * s->decorr[i].delta;
267
                s->decorr[i].samplesA[j] = L = L2;
268
                s->decorr[i].samplesB[j] = R = R2;
269
            }else if(t == -1){
270
                L2 = L + ((s->decorr[i].weightA * s->decorr[i].samplesA[0] + 512) >> 10);
271
                UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, s->decorr[i].samplesA[0], L);
272
                L = L2;
273
                R2 = R + ((s->decorr[i].weightB * L2 + 512) >> 10);
274
                UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, L2, R);
275
                R = R2;
276
                s->decorr[i].samplesA[0] = R;
277
            }else{
278
                R2 = R + ((s->decorr[i].weightB * s->decorr[i].samplesB[0] + 512) >> 10);
279
                UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, s->decorr[i].samplesB[0], R);
280
                R = R2;
281

    
282
                if(t == -3){
283
                    R2 = s->decorr[i].samplesA[0];
284
                    s->decorr[i].samplesA[0] = R;
285
                }
286

    
287
                L2 = L + ((s->decorr[i].weightA * R2 + 512) >> 10);
288
                UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, R2, L);
289
                L = L2;
290
                s->decorr[i].samplesB[0] = L;
291
            }
292
        }
293
        pos = (pos + 1) & 7;
294
        if(s->joint)
295
            L += (R -= (L >> 1));
296
        crc = (crc * 3 + L) * 3 + R;
297
        bit = (L & s->and) | s->or;
298
        *dst++ = ((L + bit) << s->shift) - bit;
299
        bit = (R & s->and) | s->or;
300
        *dst++ = ((R + bit) << s->shift) - bit;
301
        count++;
302
    }while(!last && count < s->samples);
303

    
304
    if(crc != s->CRC){
305
        av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
306
        return -1;
307
    }
308
    return count * 2;
309
}
310

    
311
static int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, int16_t *dst)
312
{
313
    int i, j, count = 0;
314
    int last, t;
315
    int A, S, T, bit;
316
    int pos = 0;
317
    uint32_t crc = 0xFFFFFFFF;
318

    
319
    s->one = s->zero = s->zeroes = 0;
320
    do{
321
        T = wv_get_value(s, gb, s->median, &last);
322
        S = 0;
323
        if(last) break;
324
        for(i = 0; i < s->terms; i++){
325
            t = s->decorr[i].value;
326
            if(t > 8){
327
                if(t & 1)
328
                    A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
329
                else
330
                    A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
331
                s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
332
                j = 0;
333
            }else{
334
                A = s->decorr[i].samplesA[pos];
335
                j = (pos + t) & 7;
336
            }
337
            S = T + ((s->decorr[i].weightA * A + 512) >> 10);
338
            if(A && T) s->decorr[i].weightA -= ((((T ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
339
            s->decorr[i].samplesA[j] = T = S;
340
        }
341
        pos = (pos + 1) & 7;
342
        crc = crc * 3 + S;
343
        bit = (S & s->and) | s->or;
344
        *dst++ = ((S + bit) << s->shift) - bit;
345
        count++;
346
    }while(!last && count < s->samples);
347

    
348
    if(crc != s->CRC){
349
        av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
350
        return -1;
351
    }
352
    return count;
353
}
354

    
355
static int wavpack_decode_init(AVCodecContext *avctx)
356
{
357
    WavpackContext *s = avctx->priv_data;
358

    
359
    s->avctx = avctx;
360
    s->stereo = (avctx->channels == 2);
361

    
362
    return 0;
363
}
364

    
365
static int wavpack_decode_close(AVCodecContext *avctx)
366
{
367
//    WavpackContext *s = avctx->priv_data;
368

    
369
    return 0;
370
}
371

    
372
static int wavpack_decode_frame(AVCodecContext *avctx,
373
                            void *data, int *data_size,
374
                            uint8_t *buf, int buf_size)
375
{
376
    WavpackContext *s = avctx->priv_data;
377
    int16_t *samples = data;
378
    int samplecount;
379
    int got_terms = 0, got_weights = 0, got_samples = 0, got_entropy = 0, got_bs = 0;
380
    uint8_t* buf_end = buf + buf_size;
381
    int i, j, id, size, ssize, weights, t;
382

    
383
    if (buf_size == 0){
384
        *data_size = 0;
385
        return 0;
386
    }
387

    
388
    memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr));
389
    s->and = s->or = s->shift = 0;
390

    
391
    s->samples = AV_RL32(buf); buf += 4;
392
    if(!s->samples){
393
        *data_size = 0;
394
        return buf_size;
395
    }
396
    /* should not happen but who knows */
397
    if(s->samples * 2 * avctx->channels > *data_size){
398
        av_log(avctx, AV_LOG_ERROR, "Packet size is too big to be handled in lavc!\n");
399
        return -1;
400
    }
401
    s->joint = AV_RL32(buf) & WV_JOINT_STEREO; buf += 4;
402
    s->CRC = AV_RL32(buf); buf += 4;
403
    // parse metadata blocks
404
    while(buf < buf_end){
405
        id = *buf++;
406
        size = *buf++;
407
        if(id & WP_IDF_LONG) {
408
            size |= (*buf++) << 8;
409
            size |= (*buf++) << 16;
410
        }
411
        size <<= 1; // size is specified in words
412
        ssize = size;
413
        if(id & WP_IDF_ODD) size--;
414
        if(size < 0){
415
            av_log(avctx, AV_LOG_ERROR, "Got incorrect block %02X with size %i\n", id, size);
416
            break;
417
        }
418
        if(buf + ssize > buf_end){
419
            av_log(avctx, AV_LOG_ERROR, "Block size %i is out of bounds\n", size);
420
            break;
421
        }
422
        if(id & WP_IDF_IGNORE){
423
            buf += ssize;
424
            continue;
425
        }
426
        switch(id & WP_IDF_MASK){
427
        case WP_ID_DECTERMS:
428
            s->terms = size;
429
            if(s->terms > MAX_TERMS){
430
                av_log(avctx, AV_LOG_ERROR, "Too many decorrelation terms\n");
431
                buf += ssize;
432
                continue;
433
            }
434
            for(i = 0; i < s->terms; i++) {
435
                s->decorr[s->terms - i - 1].value = (*buf & 0x1F) - 5;
436
                s->decorr[s->terms - i - 1].delta = *buf >> 5;
437
                buf++;
438
            }
439
            got_terms = 1;
440
            break;
441
        case WP_ID_DECWEIGHTS:
442
            if(!got_terms){
443
                av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
444
                continue;
445
            }
446
            weights = size >> s->stereo;
447
            if(weights > MAX_TERMS || weights > s->terms){
448
                av_log(avctx, AV_LOG_ERROR, "Too many decorrelation weights\n");
449
                buf += ssize;
450
                continue;
451
            }
452
            for(i = 0; i < weights; i++) {
453
                t = (int8_t)(*buf++);
454
                s->decorr[s->terms - i - 1].weightA = t << 3;
455
                if(s->decorr[s->terms - i - 1].weightA > 0)
456
                    s->decorr[s->terms - i - 1].weightA += (s->decorr[s->terms - i - 1].weightA + 64) >> 7;
457
                if(s->stereo){
458
                    t = (int8_t)(*buf++);
459
                    s->decorr[s->terms - i - 1].weightB = t << 3;
460
                    if(s->decorr[s->terms - i - 1].weightB > 0)
461
                        s->decorr[s->terms - i - 1].weightB += (s->decorr[s->terms - i - 1].weightB + 64) >> 7;
462
                }
463
            }
464
            got_weights = 1;
465
            break;
466
        case WP_ID_DECSAMPLES:
467
            if(!got_terms){
468
                av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
469
                continue;
470
            }
471
            t = 0;
472
            for(i = s->terms - 1; (i >= 0) && (t < size); i--) {
473
                if(s->decorr[i].value > 8){
474
                    s->decorr[i].samplesA[0] = wp_exp2(AV_RL16(buf)); buf += 2;
475
                    s->decorr[i].samplesA[1] = wp_exp2(AV_RL16(buf)); buf += 2;
476
                    if(s->stereo){
477
                        s->decorr[i].samplesB[0] = wp_exp2(AV_RL16(buf)); buf += 2;
478
                        s->decorr[i].samplesB[1] = wp_exp2(AV_RL16(buf)); buf += 2;
479
                        t += 4;
480
                    }
481
                    t += 4;
482
                }else if(s->decorr[i].value < 0){
483
                    s->decorr[i].samplesA[0] = wp_exp2(AV_RL16(buf)); buf += 2;
484
                    s->decorr[i].samplesB[0] = wp_exp2(AV_RL16(buf)); buf += 2;
485
                    t += 4;
486
                }else{
487
                    for(j = 0; j < s->decorr[i].value; j++){
488
                        s->decorr[i].samplesA[j] = wp_exp2(AV_RL16(buf)); buf += 2;
489
                        if(s->stereo){
490
                            s->decorr[i].samplesB[j] = wp_exp2(AV_RL16(buf)); buf += 2;
491
                        }
492
                    }
493
                    t += s->decorr[i].value * 2 * avctx->channels;
494
                }
495
            }
496
            got_samples = 1;
497
            break;
498
        case WP_ID_ENTROPY:
499
            if(size != 6 * avctx->channels){
500
                av_log(avctx, AV_LOG_ERROR, "Entropy vars size should be %i, got %i", 6 * avctx->channels, size);
501
                buf += ssize;
502
                continue;
503
            }
504
            for(i = 0; i < 3 * avctx->channels; i++){
505
                s->median[i] = wp_exp2(AV_RL16(buf));
506
                buf += 2;
507
            }
508
            got_entropy = 1;
509
            break;
510
        case WP_ID_INT32INFO:
511
            if(size != 4 || *buf){
512
                av_log(avctx, AV_LOG_ERROR, "Invalid INT32INFO, size = %i, sent_bits = %i\n", size, *buf);
513
                buf += ssize;
514
                continue;
515
            }
516
            if(buf[1])
517
                s->shift = buf[1];
518
            else if(buf[2]){
519
                s->and = s->or = 1;
520
                s->shift = buf[2];
521
            }else if(buf[3]){
522
                s->and = 1;
523
                s->shift = buf[3];
524
            }
525
            buf += 4;
526
            break;
527
        case WP_ID_DATA:
528
            init_get_bits(&s->gb, buf, size * 8);
529
            s->data_size = size * 8;
530
            buf += size;
531
            got_bs = 1;
532
            break;
533
        default:
534
            buf += size;
535
        }
536
        if(id & WP_IDF_ODD) buf++;
537
    }
538
    if(!got_terms){
539
        av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n");
540
        return -1;
541
    }
542
    if(!got_weights){
543
        av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n");
544
        return -1;
545
    }
546
    if(!got_samples){
547
        av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n");
548
        return -1;
549
    }
550
    if(!got_entropy){
551
        av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n");
552
        return -1;
553
    }
554
    if(!got_bs){
555
        av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");
556
        return -1;
557
    }
558

    
559
    if(s->stereo)
560
        samplecount = wv_unpack_stereo(s, &s->gb, samples);
561
    else
562
        samplecount = wv_unpack_mono(s, &s->gb, samples);
563
    *data_size = samplecount * 2;
564

    
565
    return buf_size;
566
}
567

    
568
AVCodec wavpack_decoder = {
569
    "wavpack",
570
    CODEC_TYPE_AUDIO,
571
    CODEC_ID_WAVPACK,
572
    sizeof(WavpackContext),
573
    wavpack_decode_init,
574
    NULL,
575
    wavpack_decode_close,
576
    wavpack_decode_frame,
577
};