Statistics
| Branch: | Revision:

ffmpeg / libavcodec / wmadec.c @ f08d171c

History | View | Annotate | Download (31.4 KB)

1
/*
2
 * WMA compatible decoder
3
 * Copyright (c) 2002 The FFmpeg Project
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * 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.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
/**
23
 * @file
24
 * WMA compatible decoder.
25
 * This decoder handles Microsoft Windows Media Audio data, versions 1 & 2.
26
 * WMA v1 is identified by audio format 0x160 in Microsoft media files
27
 * (ASF/AVI/WAV). WMA v2 is identified by audio format 0x161.
28
 *
29
 * To use this decoder, a calling application must supply the extra data
30
 * bytes provided with the WMA data. These are the extra, codec-specific
31
 * bytes at the end of a WAVEFORMATEX data structure. Transmit these bytes
32
 * to the decoder using the extradata[_size] fields in AVCodecContext. There
33
 * should be 4 extra bytes for v1 data and 6 extra bytes for v2 data.
34
 */
35

    
36
#include "avcodec.h"
37
#include "wma.h"
38

    
39
#undef NDEBUG
40
#include <assert.h>
41

    
42
#define EXPVLCBITS 8
43
#define EXPMAX ((19+EXPVLCBITS-1)/EXPVLCBITS)
44

    
45
#define HGAINVLCBITS 9
46
#define HGAINMAX ((13+HGAINVLCBITS-1)/HGAINVLCBITS)
47

    
48
static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len);
49

    
50
#ifdef TRACE
51
static void dump_shorts(WMACodecContext *s, const char *name, const short *tab, int n)
52
{
53
    int i;
54

    
55
    tprintf(s->avctx, "%s[%d]:\n", name, n);
56
    for(i=0;i<n;i++) {
57
        if ((i & 7) == 0)
58
            tprintf(s->avctx, "%4d: ", i);
59
        tprintf(s->avctx, " %5d.0", tab[i]);
60
        if ((i & 7) == 7)
61
            tprintf(s->avctx, "\n");
62
    }
63
}
64

    
65
static void dump_floats(WMACodecContext *s, const char *name, int prec, const float *tab, int n)
66
{
67
    int i;
68

    
69
    tprintf(s->avctx, "%s[%d]:\n", name, n);
70
    for(i=0;i<n;i++) {
71
        if ((i & 7) == 0)
72
            tprintf(s->avctx, "%4d: ", i);
73
        tprintf(s->avctx, " %8.*f", prec, tab[i]);
74
        if ((i & 7) == 7)
75
            tprintf(s->avctx, "\n");
76
    }
77
    if ((i & 7) != 0)
78
        tprintf(s->avctx, "\n");
79
}
80
#endif
81

    
82
static int wma_decode_init(AVCodecContext * avctx)
83
{
84
    WMACodecContext *s = avctx->priv_data;
85
    int i, flags2;
86
    uint8_t *extradata;
87

    
88
    s->avctx = avctx;
89

    
90
    /* extract flag infos */
91
    flags2 = 0;
92
    extradata = avctx->extradata;
93
    if (avctx->codec->id == CODEC_ID_WMAV1 && avctx->extradata_size >= 4) {
94
        flags2 = AV_RL16(extradata+2);
95
    } else if (avctx->codec->id == CODEC_ID_WMAV2 && avctx->extradata_size >= 6) {
96
        flags2 = AV_RL16(extradata+4);
97
    }
98
// for(i=0; i<avctx->extradata_size; i++)
99
//     av_log(NULL, AV_LOG_ERROR, "%02X ", extradata[i]);
100

    
101
    s->use_exp_vlc = flags2 & 0x0001;
102
    s->use_bit_reservoir = flags2 & 0x0002;
103
    s->use_variable_block_len = flags2 & 0x0004;
104

    
105
    if(avctx->codec->id == CODEC_ID_WMAV2 && avctx->extradata_size >= 8){
106
        if(AV_RL16(extradata+4)==0xd && s->use_variable_block_len){
107
            av_log(avctx, AV_LOG_WARNING, "Disabling use_variable_block_len, if this fails contact the ffmpeg developers and send us the file\n");
108
            s->use_variable_block_len= 0; // this fixes issue1503
109
        }
110
    }
111

    
112
    if(ff_wma_init(avctx, flags2)<0)
113
        return -1;
114

    
115
    /* init MDCT */
116
    for(i = 0; i < s->nb_block_sizes; i++)
117
        ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 1, 1.0);
118

    
119
    if (s->use_noise_coding) {
120
        init_vlc(&s->hgain_vlc, HGAINVLCBITS, sizeof(ff_wma_hgain_huffbits),
121
                 ff_wma_hgain_huffbits, 1, 1,
122
                 ff_wma_hgain_huffcodes, 2, 2, 0);
123
    }
124

    
125
    if (s->use_exp_vlc) {
126
        init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(ff_aac_scalefactor_bits), //FIXME move out of context
127
                 ff_aac_scalefactor_bits, 1, 1,
128
                 ff_aac_scalefactor_code, 4, 4, 0);
129
    } else {
130
        wma_lsp_to_curve_init(s, s->frame_len);
131
    }
132

    
133
    avctx->sample_fmt = AV_SAMPLE_FMT_S16;
134
    return 0;
135
}
136

    
137
/**
138
 * compute x^-0.25 with an exponent and mantissa table. We use linear
139
 * interpolation to reduce the mantissa table size at a small speed
140
 * expense (linear interpolation approximately doubles the number of
141
 * bits of precision).
142
 */
143
static inline float pow_m1_4(WMACodecContext *s, float x)
144
{
145
    union {
146
        float f;
147
        unsigned int v;
148
    } u, t;
149
    unsigned int e, m;
150
    float a, b;
151

    
152
    u.f = x;
153
    e = u.v >> 23;
154
    m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
155
    /* build interpolation scale: 1 <= t < 2. */
156
    t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
157
    a = s->lsp_pow_m_table1[m];
158
    b = s->lsp_pow_m_table2[m];
159
    return s->lsp_pow_e_table[e] * (a + b * t.f);
160
}
161

    
162
static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len)
163
{
164
    float wdel, a, b;
165
    int i, e, m;
166

    
167
    wdel = M_PI / frame_len;
168
    for(i=0;i<frame_len;i++)
169
        s->lsp_cos_table[i] = 2.0f * cos(wdel * i);
170

    
171
    /* tables for x^-0.25 computation */
172
    for(i=0;i<256;i++) {
173
        e = i - 126;
174
        s->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
175
    }
176

    
177
    /* NOTE: these two tables are needed to avoid two operations in
178
       pow_m1_4 */
179
    b = 1.0;
180
    for(i=(1 << LSP_POW_BITS) - 1;i>=0;i--) {
181
        m = (1 << LSP_POW_BITS) + i;
182
        a = (float)m * (0.5 / (1 << LSP_POW_BITS));
183
        a = pow(a, -0.25);
184
        s->lsp_pow_m_table1[i] = 2 * a - b;
185
        s->lsp_pow_m_table2[i] = b - a;
186
        b = a;
187
    }
188
#if 0
189
    for(i=1;i<20;i++) {
190
        float v, r1, r2;
191
        v = 5.0 / i;
192
        r1 = pow_m1_4(s, v);
193
        r2 = pow(v,-0.25);
194
        printf("%f^-0.25=%f e=%f\n", v, r1, r2 - r1);
195
    }
196
#endif
197
}
198

    
199
/**
200
 * NOTE: We use the same code as Vorbis here
201
 * @todo optimize it further with SSE/3Dnow
202
 */
203
static void wma_lsp_to_curve(WMACodecContext *s,
204
                             float *out, float *val_max_ptr,
205
                             int n, float *lsp)
206
{
207
    int i, j;
208
    float p, q, w, v, val_max;
209

    
210
    val_max = 0;
211
    for(i=0;i<n;i++) {
212
        p = 0.5f;
213
        q = 0.5f;
214
        w = s->lsp_cos_table[i];
215
        for(j=1;j<NB_LSP_COEFS;j+=2){
216
            q *= w - lsp[j - 1];
217
            p *= w - lsp[j];
218
        }
219
        p *= p * (2.0f - w);
220
        q *= q * (2.0f + w);
221
        v = p + q;
222
        v = pow_m1_4(s, v);
223
        if (v > val_max)
224
            val_max = v;
225
        out[i] = v;
226
    }
227
    *val_max_ptr = val_max;
228
}
229

    
230
/**
231
 * decode exponents coded with LSP coefficients (same idea as Vorbis)
232
 */
233
static void decode_exp_lsp(WMACodecContext *s, int ch)
234
{
235
    float lsp_coefs[NB_LSP_COEFS];
236
    int val, i;
237

    
238
    for(i = 0; i < NB_LSP_COEFS; i++) {
239
        if (i == 0 || i >= 8)
240
            val = get_bits(&s->gb, 3);
241
        else
242
            val = get_bits(&s->gb, 4);
243
        lsp_coefs[i] = ff_wma_lsp_codebook[i][val];
244
    }
245

    
246
    wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch],
247
                     s->block_len, lsp_coefs);
248
}
249

    
250
/** pow(10, i / 16.0) for i in -60..95 */
251
static const float pow_tab[] = {
252
    1.7782794100389e-04, 2.0535250264571e-04,
253
    2.3713737056617e-04, 2.7384196342644e-04,
254
    3.1622776601684e-04, 3.6517412725484e-04,
255
    4.2169650342858e-04, 4.8696752516586e-04,
256
    5.6234132519035e-04, 6.4938163157621e-04,
257
    7.4989420933246e-04, 8.6596432336006e-04,
258
    1.0000000000000e-03, 1.1547819846895e-03,
259
    1.3335214321633e-03, 1.5399265260595e-03,
260
    1.7782794100389e-03, 2.0535250264571e-03,
261
    2.3713737056617e-03, 2.7384196342644e-03,
262
    3.1622776601684e-03, 3.6517412725484e-03,
263
    4.2169650342858e-03, 4.8696752516586e-03,
264
    5.6234132519035e-03, 6.4938163157621e-03,
265
    7.4989420933246e-03, 8.6596432336006e-03,
266
    1.0000000000000e-02, 1.1547819846895e-02,
267
    1.3335214321633e-02, 1.5399265260595e-02,
268
    1.7782794100389e-02, 2.0535250264571e-02,
269
    2.3713737056617e-02, 2.7384196342644e-02,
270
    3.1622776601684e-02, 3.6517412725484e-02,
271
    4.2169650342858e-02, 4.8696752516586e-02,
272
    5.6234132519035e-02, 6.4938163157621e-02,
273
    7.4989420933246e-02, 8.6596432336007e-02,
274
    1.0000000000000e-01, 1.1547819846895e-01,
275
    1.3335214321633e-01, 1.5399265260595e-01,
276
    1.7782794100389e-01, 2.0535250264571e-01,
277
    2.3713737056617e-01, 2.7384196342644e-01,
278
    3.1622776601684e-01, 3.6517412725484e-01,
279
    4.2169650342858e-01, 4.8696752516586e-01,
280
    5.6234132519035e-01, 6.4938163157621e-01,
281
    7.4989420933246e-01, 8.6596432336007e-01,
282
    1.0000000000000e+00, 1.1547819846895e+00,
283
    1.3335214321633e+00, 1.5399265260595e+00,
284
    1.7782794100389e+00, 2.0535250264571e+00,
285
    2.3713737056617e+00, 2.7384196342644e+00,
286
    3.1622776601684e+00, 3.6517412725484e+00,
287
    4.2169650342858e+00, 4.8696752516586e+00,
288
    5.6234132519035e+00, 6.4938163157621e+00,
289
    7.4989420933246e+00, 8.6596432336007e+00,
290
    1.0000000000000e+01, 1.1547819846895e+01,
291
    1.3335214321633e+01, 1.5399265260595e+01,
292
    1.7782794100389e+01, 2.0535250264571e+01,
293
    2.3713737056617e+01, 2.7384196342644e+01,
294
    3.1622776601684e+01, 3.6517412725484e+01,
295
    4.2169650342858e+01, 4.8696752516586e+01,
296
    5.6234132519035e+01, 6.4938163157621e+01,
297
    7.4989420933246e+01, 8.6596432336007e+01,
298
    1.0000000000000e+02, 1.1547819846895e+02,
299
    1.3335214321633e+02, 1.5399265260595e+02,
300
    1.7782794100389e+02, 2.0535250264571e+02,
301
    2.3713737056617e+02, 2.7384196342644e+02,
302
    3.1622776601684e+02, 3.6517412725484e+02,
303
    4.2169650342858e+02, 4.8696752516586e+02,
304
    5.6234132519035e+02, 6.4938163157621e+02,
305
    7.4989420933246e+02, 8.6596432336007e+02,
306
    1.0000000000000e+03, 1.1547819846895e+03,
307
    1.3335214321633e+03, 1.5399265260595e+03,
308
    1.7782794100389e+03, 2.0535250264571e+03,
309
    2.3713737056617e+03, 2.7384196342644e+03,
310
    3.1622776601684e+03, 3.6517412725484e+03,
311
    4.2169650342858e+03, 4.8696752516586e+03,
312
    5.6234132519035e+03, 6.4938163157621e+03,
313
    7.4989420933246e+03, 8.6596432336007e+03,
314
    1.0000000000000e+04, 1.1547819846895e+04,
315
    1.3335214321633e+04, 1.5399265260595e+04,
316
    1.7782794100389e+04, 2.0535250264571e+04,
317
    2.3713737056617e+04, 2.7384196342644e+04,
318
    3.1622776601684e+04, 3.6517412725484e+04,
319
    4.2169650342858e+04, 4.8696752516586e+04,
320
    5.6234132519035e+04, 6.4938163157621e+04,
321
    7.4989420933246e+04, 8.6596432336007e+04,
322
    1.0000000000000e+05, 1.1547819846895e+05,
323
    1.3335214321633e+05, 1.5399265260595e+05,
324
    1.7782794100389e+05, 2.0535250264571e+05,
325
    2.3713737056617e+05, 2.7384196342644e+05,
326
    3.1622776601684e+05, 3.6517412725484e+05,
327
    4.2169650342858e+05, 4.8696752516586e+05,
328
    5.6234132519035e+05, 6.4938163157621e+05,
329
    7.4989420933246e+05, 8.6596432336007e+05,
330
};
331

    
332
/**
333
 * decode exponents coded with VLC codes
334
 */
335
static int decode_exp_vlc(WMACodecContext *s, int ch)
336
{
337
    int last_exp, n, code;
338
    const uint16_t *ptr;
339
    float v, max_scale;
340
    uint32_t *q, *q_end, iv;
341
    const float *ptab = pow_tab + 60;
342
    const uint32_t *iptab = (const uint32_t*)ptab;
343

    
344
    ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
345
    q = (uint32_t *)s->exponents[ch];
346
    q_end = q + s->block_len;
347
    max_scale = 0;
348
    if (s->version == 1) {
349
        last_exp = get_bits(&s->gb, 5) + 10;
350
        v = ptab[last_exp];
351
        iv = iptab[last_exp];
352
        max_scale = v;
353
        n = *ptr++;
354
        switch (n & 3) do {
355
        case 0: *q++ = iv;
356
        case 3: *q++ = iv;
357
        case 2: *q++ = iv;
358
        case 1: *q++ = iv;
359
        } while ((n -= 4) > 0);
360
    }else
361
        last_exp = 36;
362

    
363
    while (q < q_end) {
364
        code = get_vlc2(&s->gb, s->exp_vlc.table, EXPVLCBITS, EXPMAX);
365
        if (code < 0){
366
            av_log(s->avctx, AV_LOG_ERROR, "Exponent vlc invalid\n");
367
            return -1;
368
        }
369
        /* NOTE: this offset is the same as MPEG4 AAC ! */
370
        last_exp += code - 60;
371
        if ((unsigned)last_exp + 60 > FF_ARRAY_ELEMS(pow_tab)) {
372
            av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n",
373
                   last_exp);
374
            return -1;
375
        }
376
        v = ptab[last_exp];
377
        iv = iptab[last_exp];
378
        if (v > max_scale)
379
            max_scale = v;
380
        n = *ptr++;
381
        switch (n & 3) do {
382
        case 0: *q++ = iv;
383
        case 3: *q++ = iv;
384
        case 2: *q++ = iv;
385
        case 1: *q++ = iv;
386
        } while ((n -= 4) > 0);
387
    }
388
    s->max_exponent[ch] = max_scale;
389
    return 0;
390
}
391

    
392

    
393
/**
394
 * Apply MDCT window and add into output.
395
 *
396
 * We ensure that when the windows overlap their squared sum
397
 * is always 1 (MDCT reconstruction rule).
398
 */
399
static void wma_window(WMACodecContext *s, float *out)
400
{
401
    float *in = s->output;
402
    int block_len, bsize, n;
403

    
404
    /* left part */
405
    if (s->block_len_bits <= s->prev_block_len_bits) {
406
        block_len = s->block_len;
407
        bsize = s->frame_len_bits - s->block_len_bits;
408

    
409
        s->dsp.vector_fmul_add(out, in, s->windows[bsize],
410
                               out, block_len);
411

    
412
    } else {
413
        block_len = 1 << s->prev_block_len_bits;
414
        n = (s->block_len - block_len) / 2;
415
        bsize = s->frame_len_bits - s->prev_block_len_bits;
416

    
417
        s->dsp.vector_fmul_add(out+n, in+n, s->windows[bsize],
418
                               out+n, block_len);
419

    
420
        memcpy(out+n+block_len, in+n+block_len, n*sizeof(float));
421
    }
422

    
423
    out += s->block_len;
424
    in += s->block_len;
425

    
426
    /* right part */
427
    if (s->block_len_bits <= s->next_block_len_bits) {
428
        block_len = s->block_len;
429
        bsize = s->frame_len_bits - s->block_len_bits;
430

    
431
        s->dsp.vector_fmul_reverse(out, in, s->windows[bsize], block_len);
432

    
433
    } else {
434
        block_len = 1 << s->next_block_len_bits;
435
        n = (s->block_len - block_len) / 2;
436
        bsize = s->frame_len_bits - s->next_block_len_bits;
437

    
438
        memcpy(out, in, n*sizeof(float));
439

    
440
        s->dsp.vector_fmul_reverse(out+n, in+n, s->windows[bsize], block_len);
441

    
442
        memset(out+n+block_len, 0, n*sizeof(float));
443
    }
444
}
445

    
446

    
447
/**
448
 * @return 0 if OK. 1 if last block of frame. return -1 if
449
 * unrecorrable error.
450
 */
451
static int wma_decode_block(WMACodecContext *s)
452
{
453
    int n, v, a, ch, bsize;
454
    int coef_nb_bits, total_gain;
455
    int nb_coefs[MAX_CHANNELS];
456
    float mdct_norm;
457
    FFTContext *mdct;
458

    
459
#ifdef TRACE
460
    tprintf(s->avctx, "***decode_block: %d:%d\n", s->frame_count - 1, s->block_num);
461
#endif
462

    
463
    /* compute current block length */
464
    if (s->use_variable_block_len) {
465
        n = av_log2(s->nb_block_sizes - 1) + 1;
466

    
467
        if (s->reset_block_lengths) {
468
            s->reset_block_lengths = 0;
469
            v = get_bits(&s->gb, n);
470
            if (v >= s->nb_block_sizes){
471
                av_log(s->avctx, AV_LOG_ERROR, "prev_block_len_bits %d out of range\n", s->frame_len_bits - v);
472
                return -1;
473
            }
474
            s->prev_block_len_bits = s->frame_len_bits - v;
475
            v = get_bits(&s->gb, n);
476
            if (v >= s->nb_block_sizes){
477
                av_log(s->avctx, AV_LOG_ERROR, "block_len_bits %d out of range\n", s->frame_len_bits - v);
478
                return -1;
479
            }
480
            s->block_len_bits = s->frame_len_bits - v;
481
        } else {
482
            /* update block lengths */
483
            s->prev_block_len_bits = s->block_len_bits;
484
            s->block_len_bits = s->next_block_len_bits;
485
        }
486
        v = get_bits(&s->gb, n);
487
        if (v >= s->nb_block_sizes){
488
            av_log(s->avctx, AV_LOG_ERROR, "next_block_len_bits %d out of range\n", s->frame_len_bits - v);
489
            return -1;
490
        }
491
        s->next_block_len_bits = s->frame_len_bits - v;
492
    } else {
493
        /* fixed block len */
494
        s->next_block_len_bits = s->frame_len_bits;
495
        s->prev_block_len_bits = s->frame_len_bits;
496
        s->block_len_bits = s->frame_len_bits;
497
    }
498

    
499
    if (s->frame_len_bits - s->block_len_bits >= s->nb_block_sizes){
500
        av_log(s->avctx, AV_LOG_ERROR, "block_len_bits not initialized to a valid value\n");
501
        return -1;
502
    }
503

    
504
    /* now check if the block length is coherent with the frame length */
505
    s->block_len = 1 << s->block_len_bits;
506
    if ((s->block_pos + s->block_len) > s->frame_len){
507
        av_log(s->avctx, AV_LOG_ERROR, "frame_len overflow\n");
508
        return -1;
509
    }
510

    
511
    if (s->nb_channels == 2) {
512
        s->ms_stereo = get_bits1(&s->gb);
513
    }
514
    v = 0;
515
    for(ch = 0; ch < s->nb_channels; ch++) {
516
        a = get_bits1(&s->gb);
517
        s->channel_coded[ch] = a;
518
        v |= a;
519
    }
520

    
521
    bsize = s->frame_len_bits - s->block_len_bits;
522

    
523
    /* if no channel coded, no need to go further */
524
    /* XXX: fix potential framing problems */
525
    if (!v)
526
        goto next;
527

    
528
    /* read total gain and extract corresponding number of bits for
529
       coef escape coding */
530
    total_gain = 1;
531
    for(;;) {
532
        a = get_bits(&s->gb, 7);
533
        total_gain += a;
534
        if (a != 127)
535
            break;
536
    }
537

    
538
    coef_nb_bits= ff_wma_total_gain_to_bits(total_gain);
539

    
540
    /* compute number of coefficients */
541
    n = s->coefs_end[bsize] - s->coefs_start;
542
    for(ch = 0; ch < s->nb_channels; ch++)
543
        nb_coefs[ch] = n;
544

    
545
    /* complex coding */
546
    if (s->use_noise_coding) {
547

    
548
        for(ch = 0; ch < s->nb_channels; ch++) {
549
            if (s->channel_coded[ch]) {
550
                int i, n, a;
551
                n = s->exponent_high_sizes[bsize];
552
                for(i=0;i<n;i++) {
553
                    a = get_bits1(&s->gb);
554
                    s->high_band_coded[ch][i] = a;
555
                    /* if noise coding, the coefficients are not transmitted */
556
                    if (a)
557
                        nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
558
                }
559
            }
560
        }
561
        for(ch = 0; ch < s->nb_channels; ch++) {
562
            if (s->channel_coded[ch]) {
563
                int i, n, val, code;
564

    
565
                n = s->exponent_high_sizes[bsize];
566
                val = (int)0x80000000;
567
                for(i=0;i<n;i++) {
568
                    if (s->high_band_coded[ch][i]) {
569
                        if (val == (int)0x80000000) {
570
                            val = get_bits(&s->gb, 7) - 19;
571
                        } else {
572
                            code = get_vlc2(&s->gb, s->hgain_vlc.table, HGAINVLCBITS, HGAINMAX);
573
                            if (code < 0){
574
                                av_log(s->avctx, AV_LOG_ERROR, "hgain vlc invalid\n");
575
                                return -1;
576
                            }
577
                            val += code - 18;
578
                        }
579
                        s->high_band_values[ch][i] = val;
580
                    }
581
                }
582
            }
583
        }
584
    }
585

    
586
    /* exponents can be reused in short blocks. */
587
    if ((s->block_len_bits == s->frame_len_bits) ||
588
        get_bits1(&s->gb)) {
589
        for(ch = 0; ch < s->nb_channels; ch++) {
590
            if (s->channel_coded[ch]) {
591
                if (s->use_exp_vlc) {
592
                    if (decode_exp_vlc(s, ch) < 0)
593
                        return -1;
594
                } else {
595
                    decode_exp_lsp(s, ch);
596
                }
597
                s->exponents_bsize[ch] = bsize;
598
            }
599
        }
600
    }
601

    
602
    /* parse spectral coefficients : just RLE encoding */
603
    for(ch = 0; ch < s->nb_channels; ch++) {
604
        if (s->channel_coded[ch]) {
605
            int tindex;
606
            WMACoef* ptr = &s->coefs1[ch][0];
607

    
608
            /* special VLC tables are used for ms stereo because
609
               there is potentially less energy there */
610
            tindex = (ch == 1 && s->ms_stereo);
611
            memset(ptr, 0, s->block_len * sizeof(WMACoef));
612
            ff_wma_run_level_decode(s->avctx, &s->gb, &s->coef_vlc[tindex],
613
                  s->level_table[tindex], s->run_table[tindex],
614
                  0, ptr, 0, nb_coefs[ch],
615
                  s->block_len, s->frame_len_bits, coef_nb_bits);
616
        }
617
        if (s->version == 1 && s->nb_channels >= 2) {
618
            align_get_bits(&s->gb);
619
        }
620
    }
621

    
622
    /* normalize */
623
    {
624
        int n4 = s->block_len / 2;
625
        mdct_norm = 1.0 / (float)n4;
626
        if (s->version == 1) {
627
            mdct_norm *= sqrt(n4);
628
        }
629
    }
630

    
631
    /* finally compute the MDCT coefficients */
632
    for(ch = 0; ch < s->nb_channels; ch++) {
633
        if (s->channel_coded[ch]) {
634
            WMACoef *coefs1;
635
            float *coefs, *exponents, mult, mult1, noise;
636
            int i, j, n, n1, last_high_band, esize;
637
            float exp_power[HIGH_BAND_MAX_SIZE];
638

    
639
            coefs1 = s->coefs1[ch];
640
            exponents = s->exponents[ch];
641
            esize = s->exponents_bsize[ch];
642
            mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
643
            mult *= mdct_norm;
644
            coefs = s->coefs[ch];
645
            if (s->use_noise_coding) {
646
                mult1 = mult;
647
                /* very low freqs : noise */
648
                for(i = 0;i < s->coefs_start; i++) {
649
                    *coefs++ = s->noise_table[s->noise_index] *
650
                      exponents[i<<bsize>>esize] * mult1;
651
                    s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
652
                }
653

    
654
                n1 = s->exponent_high_sizes[bsize];
655

    
656
                /* compute power of high bands */
657
                exponents = s->exponents[ch] +
658
                    (s->high_band_start[bsize]<<bsize>>esize);
659
                last_high_band = 0; /* avoid warning */
660
                for(j=0;j<n1;j++) {
661
                    n = s->exponent_high_bands[s->frame_len_bits -
662
                                              s->block_len_bits][j];
663
                    if (s->high_band_coded[ch][j]) {
664
                        float e2, v;
665
                        e2 = 0;
666
                        for(i = 0;i < n; i++) {
667
                            v = exponents[i<<bsize>>esize];
668
                            e2 += v * v;
669
                        }
670
                        exp_power[j] = e2 / n;
671
                        last_high_band = j;
672
                        tprintf(s->avctx, "%d: power=%f (%d)\n", j, exp_power[j], n);
673
                    }
674
                    exponents += n<<bsize>>esize;
675
                }
676

    
677
                /* main freqs and high freqs */
678
                exponents = s->exponents[ch] + (s->coefs_start<<bsize>>esize);
679
                for(j=-1;j<n1;j++) {
680
                    if (j < 0) {
681
                        n = s->high_band_start[bsize] -
682
                            s->coefs_start;
683
                    } else {
684
                        n = s->exponent_high_bands[s->frame_len_bits -
685
                                                  s->block_len_bits][j];
686
                    }
687
                    if (j >= 0 && s->high_band_coded[ch][j]) {
688
                        /* use noise with specified power */
689
                        mult1 = sqrt(exp_power[j] / exp_power[last_high_band]);
690
                        /* XXX: use a table */
691
                        mult1 = mult1 * pow(10, s->high_band_values[ch][j] * 0.05);
692
                        mult1 = mult1 / (s->max_exponent[ch] * s->noise_mult);
693
                        mult1 *= mdct_norm;
694
                        for(i = 0;i < n; i++) {
695
                            noise = s->noise_table[s->noise_index];
696
                            s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
697
                            *coefs++ =  noise *
698
                                exponents[i<<bsize>>esize] * mult1;
699
                        }
700
                        exponents += n<<bsize>>esize;
701
                    } else {
702
                        /* coded values + small noise */
703
                        for(i = 0;i < n; i++) {
704
                            noise = s->noise_table[s->noise_index];
705
                            s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
706
                            *coefs++ = ((*coefs1++) + noise) *
707
                                exponents[i<<bsize>>esize] * mult;
708
                        }
709
                        exponents += n<<bsize>>esize;
710
                    }
711
                }
712

    
713
                /* very high freqs : noise */
714
                n = s->block_len - s->coefs_end[bsize];
715
                mult1 = mult * exponents[((-1<<bsize))>>esize];
716
                for(i = 0; i < n; i++) {
717
                    *coefs++ = s->noise_table[s->noise_index] * mult1;
718
                    s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
719
                }
720
            } else {
721
                /* XXX: optimize more */
722
                for(i = 0;i < s->coefs_start; i++)
723
                    *coefs++ = 0.0;
724
                n = nb_coefs[ch];
725
                for(i = 0;i < n; i++) {
726
                    *coefs++ = coefs1[i] * exponents[i<<bsize>>esize] * mult;
727
                }
728
                n = s->block_len - s->coefs_end[bsize];
729
                for(i = 0;i < n; i++)
730
                    *coefs++ = 0.0;
731
            }
732
        }
733
    }
734

    
735
#ifdef TRACE
736
    for(ch = 0; ch < s->nb_channels; ch++) {
737
        if (s->channel_coded[ch]) {
738
            dump_floats(s, "exponents", 3, s->exponents[ch], s->block_len);
739
            dump_floats(s, "coefs", 1, s->coefs[ch], s->block_len);
740
        }
741
    }
742
#endif
743

    
744
    if (s->ms_stereo && s->channel_coded[1]) {
745
        /* nominal case for ms stereo: we do it before mdct */
746
        /* no need to optimize this case because it should almost
747
           never happen */
748
        if (!s->channel_coded[0]) {
749
            tprintf(s->avctx, "rare ms-stereo case happened\n");
750
            memset(s->coefs[0], 0, sizeof(float) * s->block_len);
751
            s->channel_coded[0] = 1;
752
        }
753

    
754
        s->dsp.butterflies_float(s->coefs[0], s->coefs[1], s->block_len);
755
    }
756

    
757
next:
758
    mdct = &s->mdct_ctx[bsize];
759

    
760
    for(ch = 0; ch < s->nb_channels; ch++) {
761
        int n4, index;
762

    
763
        n4 = s->block_len / 2;
764
        if(s->channel_coded[ch]){
765
            mdct->imdct_calc(mdct, s->output, s->coefs[ch]);
766
        }else if(!(s->ms_stereo && ch==1))
767
            memset(s->output, 0, sizeof(s->output));
768

    
769
        /* multiply by the window and add in the frame */
770
        index = (s->frame_len / 2) + s->block_pos - n4;
771
        wma_window(s, &s->frame_out[ch][index]);
772
    }
773

    
774
    /* update block number */
775
    s->block_num++;
776
    s->block_pos += s->block_len;
777
    if (s->block_pos >= s->frame_len)
778
        return 1;
779
    else
780
        return 0;
781
}
782

    
783
/* decode a frame of frame_len samples */
784
static int wma_decode_frame(WMACodecContext *s, int16_t *samples)
785
{
786
    int ret, n, ch, incr;
787
    const float *output[MAX_CHANNELS];
788

    
789
#ifdef TRACE
790
    tprintf(s->avctx, "***decode_frame: %d size=%d\n", s->frame_count++, s->frame_len);
791
#endif
792

    
793
    /* read each block */
794
    s->block_num = 0;
795
    s->block_pos = 0;
796
    for(;;) {
797
        ret = wma_decode_block(s);
798
        if (ret < 0)
799
            return -1;
800
        if (ret)
801
            break;
802
    }
803

    
804
    /* convert frame to integer */
805
    n = s->frame_len;
806
    incr = s->nb_channels;
807
    for (ch = 0; ch < MAX_CHANNELS; ch++)
808
        output[ch] = s->frame_out[ch];
809
    s->fmt_conv.float_to_int16_interleave(samples, output, n, incr);
810
    for (ch = 0; ch < incr; ch++) {
811
        /* prepare for next block */
812
        memmove(&s->frame_out[ch][0], &s->frame_out[ch][n], n * sizeof(float));
813
    }
814

    
815
#ifdef TRACE
816
    dump_shorts(s, "samples", samples, n * s->nb_channels);
817
#endif
818
    return 0;
819
}
820

    
821
static int wma_decode_superframe(AVCodecContext *avctx,
822
                                 void *data, int *data_size,
823
                                 AVPacket *avpkt)
824
{
825
    const uint8_t *buf = avpkt->data;
826
    int buf_size = avpkt->size;
827
    WMACodecContext *s = avctx->priv_data;
828
    int nb_frames, bit_offset, i, pos, len;
829
    uint8_t *q;
830
    int16_t *samples;
831

    
832
    tprintf(avctx, "***decode_superframe:\n");
833

    
834
    if(buf_size==0){
835
        s->last_superframe_len = 0;
836
        return 0;
837
    }
838
    if (buf_size < s->block_align)
839
        return 0;
840
    buf_size = s->block_align;
841

    
842
    samples = data;
843

    
844
    init_get_bits(&s->gb, buf, buf_size*8);
845

    
846
    if (s->use_bit_reservoir) {
847
        /* read super frame header */
848
        skip_bits(&s->gb, 4); /* super frame index */
849
        nb_frames = get_bits(&s->gb, 4) - 1;
850

    
851
        if((nb_frames+1) * s->nb_channels * s->frame_len * sizeof(int16_t) > *data_size){
852
            av_log(s->avctx, AV_LOG_ERROR, "Insufficient output space\n");
853
            goto fail;
854
        }
855

    
856
        bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
857

    
858
        if (s->last_superframe_len > 0) {
859
            //        printf("skip=%d\n", s->last_bitoffset);
860
            /* add bit_offset bits to last frame */
861
            if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) >
862
                MAX_CODED_SUPERFRAME_SIZE)
863
                goto fail;
864
            q = s->last_superframe + s->last_superframe_len;
865
            len = bit_offset;
866
            while (len > 7) {
867
                *q++ = (get_bits)(&s->gb, 8);
868
                len -= 8;
869
            }
870
            if (len > 0) {
871
                *q++ = (get_bits)(&s->gb, len) << (8 - len);
872
            }
873

    
874
            /* XXX: bit_offset bits into last frame */
875
            init_get_bits(&s->gb, s->last_superframe, MAX_CODED_SUPERFRAME_SIZE*8);
876
            /* skip unused bits */
877
            if (s->last_bitoffset > 0)
878
                skip_bits(&s->gb, s->last_bitoffset);
879
            /* this frame is stored in the last superframe and in the
880
               current one */
881
            if (wma_decode_frame(s, samples) < 0)
882
                goto fail;
883
            samples += s->nb_channels * s->frame_len;
884
        }
885

    
886
        /* read each frame starting from bit_offset */
887
        pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
888
        init_get_bits(&s->gb, buf + (pos >> 3), (MAX_CODED_SUPERFRAME_SIZE - (pos >> 3))*8);
889
        len = pos & 7;
890
        if (len > 0)
891
            skip_bits(&s->gb, len);
892

    
893
        s->reset_block_lengths = 1;
894
        for(i=0;i<nb_frames;i++) {
895
            if (wma_decode_frame(s, samples) < 0)
896
                goto fail;
897
            samples += s->nb_channels * s->frame_len;
898
        }
899

    
900
        /* we copy the end of the frame in the last frame buffer */
901
        pos = get_bits_count(&s->gb) + ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7);
902
        s->last_bitoffset = pos & 7;
903
        pos >>= 3;
904
        len = buf_size - pos;
905
        if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) {
906
            av_log(s->avctx, AV_LOG_ERROR, "len %d invalid\n", len);
907
            goto fail;
908
        }
909
        s->last_superframe_len = len;
910
        memcpy(s->last_superframe, buf + pos, len);
911
    } else {
912
        if(s->nb_channels * s->frame_len * sizeof(int16_t) > *data_size){
913
            av_log(s->avctx, AV_LOG_ERROR, "Insufficient output space\n");
914
            goto fail;
915
        }
916
        /* single frame decode */
917
        if (wma_decode_frame(s, samples) < 0)
918
            goto fail;
919
        samples += s->nb_channels * s->frame_len;
920
    }
921

    
922
//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d outbytes:%d eaten:%d\n", s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len,        (int8_t *)samples - (int8_t *)data, s->block_align);
923

    
924
    *data_size = (int8_t *)samples - (int8_t *)data;
925
    return s->block_align;
926
 fail:
927
    /* when error, we reset the bit reservoir */
928
    s->last_superframe_len = 0;
929
    return -1;
930
}
931

    
932
static av_cold void flush(AVCodecContext *avctx)
933
{
934
    WMACodecContext *s = avctx->priv_data;
935

    
936
    s->last_bitoffset=
937
    s->last_superframe_len= 0;
938
}
939

    
940
AVCodec ff_wmav1_decoder =
941
{
942
    "wmav1",
943
    AVMEDIA_TYPE_AUDIO,
944
    CODEC_ID_WMAV1,
945
    sizeof(WMACodecContext),
946
    wma_decode_init,
947
    NULL,
948
    ff_wma_end,
949
    wma_decode_superframe,
950
    .flush=flush,
951
    .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
952
};
953

    
954
AVCodec ff_wmav2_decoder =
955
{
956
    "wmav2",
957
    AVMEDIA_TYPE_AUDIO,
958
    CODEC_ID_WMAV2,
959
    sizeof(WMACodecContext),
960
    wma_decode_init,
961
    NULL,
962
    ff_wma_end,
963
    wma_decode_superframe,
964
    .flush=flush,
965
    .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
966
};