GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/wmadec.c Lines: 213 440 48.4 %
Date: 2021-01-22 05:18:52 Branches: 117 262 44.7 %

Line Branch Exec Source
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 "libavutil/attributes.h"
37
#include "libavutil/ffmath.h"
38
39
#include "avcodec.h"
40
#include "internal.h"
41
#include "wma.h"
42
43
#define EXPVLCBITS 8
44
#define EXPMAX     ((19 + EXPVLCBITS - 1) / EXPVLCBITS)
45
46
#define HGAINVLCBITS 9
47
#define HGAINMAX     ((13 + HGAINVLCBITS - 1) / HGAINVLCBITS)
48
49
static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len);
50
51
#ifdef TRACE
52
static void dump_floats(WMACodecContext *s, const char *name,
53
                        int prec, const float *tab, int n)
54
{
55
    int i;
56
57
    ff_tlog(s->avctx, "%s[%d]:\n", name, n);
58
    for (i = 0; i < n; i++) {
59
        if ((i & 7) == 0)
60
            ff_tlog(s->avctx, "%4d: ", i);
61
        ff_tlog(s->avctx, " %8.*f", prec, tab[i]);
62
        if ((i & 7) == 7)
63
            ff_tlog(s->avctx, "\n");
64
    }
65
    if ((i & 7) != 0)
66
        ff_tlog(s->avctx, "\n");
67
}
68
#endif /* TRACE */
69
70
14
static av_cold int wma_decode_init(AVCodecContext *avctx)
71
{
72
14
    WMACodecContext *s = avctx->priv_data;
73
    int i, flags2;
74
    uint8_t *extradata;
75
76
14
    if (!avctx->block_align) {
77
        av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
78
        return AVERROR(EINVAL);
79
    }
80
81
14
    s->avctx = avctx;
82
83
    /* extract flag info */
84
14
    flags2    = 0;
85
14
    extradata = avctx->extradata;
86

14
    if (avctx->codec->id == AV_CODEC_ID_WMAV1 && avctx->extradata_size >= 4)
87
2
        flags2 = AV_RL16(extradata + 2);
88

12
    else if (avctx->codec->id == AV_CODEC_ID_WMAV2 && avctx->extradata_size >= 6)
89
12
        flags2 = AV_RL16(extradata + 4);
90
91
14
    s->use_exp_vlc            = flags2 & 0x0001;
92
14
    s->use_bit_reservoir      = flags2 & 0x0002;
93
14
    s->use_variable_block_len = flags2 & 0x0004;
94
95

14
    if (avctx->codec->id == AV_CODEC_ID_WMAV2 && avctx->extradata_size >= 8){
96

11
        if (AV_RL16(extradata+4)==0xd && s->use_variable_block_len){
97
            av_log(avctx, AV_LOG_WARNING, "Disabling use_variable_block_len, if this fails contact the ffmpeg developers and send us the file\n");
98
            s->use_variable_block_len= 0; // this fixes issue1503
99
        }
100
    }
101
102
42
    for (i=0; i<MAX_CHANNELS; i++)
103
28
        s->max_exponent[i] = 1.0;
104
105
14
    if (ff_wma_init(avctx, flags2) < 0)
106
        return -1;
107
108
    /* init MDCT */
109
51
    for (i = 0; i < s->nb_block_sizes; i++)
110
37
        ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 1, 1.0 / 32768.0);
111
112
14
    if (s->use_noise_coding) {
113
2
        ff_init_vlc_from_lengths(&s->hgain_vlc, HGAINVLCBITS, FF_ARRAY_ELEMS(ff_wma_hgain_hufftab),
114
                                 &ff_wma_hgain_hufftab[0][1], 2,
115
                                 &ff_wma_hgain_hufftab[0][0], 2, 1, -18, 0, avctx);
116
    }
117
118
14
    if (s->use_exp_vlc)
119
11
        init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(ff_aac_scalefactor_bits), // FIXME move out of context
120
                 ff_aac_scalefactor_bits, 1, 1,
121
                 ff_aac_scalefactor_code, 4, 4, 0);
122
    else
123
3
        wma_lsp_to_curve_init(s, s->frame_len);
124
125
14
    avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
126
127
14
    return 0;
128
}
129
130
/**
131
 * compute x^-0.25 with an exponent and mantissa table. We use linear
132
 * interpolation to reduce the mantissa table size at a small speed
133
 * expense (linear interpolation approximately doubles the number of
134
 * bits of precision).
135
 */
136
static inline float pow_m1_4(WMACodecContext *s, float x)
137
{
138
    union {
139
        float f;
140
        unsigned int v;
141
    } u, t;
142
    unsigned int e, m;
143
    float a, b;
144
145
    u.f = x;
146
    e   =  u.v >>  23;
147
    m   = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
148
    /* build interpolation scale: 1 <= t < 2. */
149
    t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
150
    a   = s->lsp_pow_m_table1[m];
151
    b   = s->lsp_pow_m_table2[m];
152
    return s->lsp_pow_e_table[e] * (a + b * t.f);
153
}
154
155
3
static av_cold void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len)
156
{
157
    float wdel, a, b;
158
    int i, e, m;
159
160
3
    wdel = M_PI / frame_len;
161
1539
    for (i = 0; i < frame_len; i++)
162
1536
        s->lsp_cos_table[i] = 2.0f * cos(wdel * i);
163
164
    /* tables for x^-0.25 computation */
165
771
    for (i = 0; i < 256; i++) {
166
768
        e                     = i - 126;
167
768
        s->lsp_pow_e_table[i] = exp2f(e * -0.25);
168
    }
169
170
    /* NOTE: these two tables are needed to avoid two operations in
171
     * pow_m1_4 */
172
3
    b = 1.0;
173
387
    for (i = (1 << LSP_POW_BITS) - 1; i >= 0; i--) {
174
384
        m                      = (1 << LSP_POW_BITS) + i;
175
384
        a                      = (float) m * (0.5 / (1 << LSP_POW_BITS));
176
384
        a                      = 1/sqrt(sqrt(a));
177
384
        s->lsp_pow_m_table1[i] = 2 * a - b;
178
384
        s->lsp_pow_m_table2[i] = b - a;
179
384
        b                      = a;
180
    }
181
3
}
182
183
/**
184
 * NOTE: We use the same code as Vorbis here
185
 * @todo optimize it further with SSE/3Dnow
186
 */
187
static void wma_lsp_to_curve(WMACodecContext *s, float *out, float *val_max_ptr,
188
                             int n, float *lsp)
189
{
190
    int i, j;
191
    float p, q, w, v, val_max;
192
193
    val_max = 0;
194
    for (i = 0; i < n; i++) {
195
        p = 0.5f;
196
        q = 0.5f;
197
        w = s->lsp_cos_table[i];
198
        for (j = 1; j < NB_LSP_COEFS; j += 2) {
199
            q *= w - lsp[j - 1];
200
            p *= w - lsp[j];
201
        }
202
        p *= p * (2.0f - w);
203
        q *= q * (2.0f + w);
204
        v  = p + q;
205
        v  = pow_m1_4(s, v);
206
        if (v > val_max)
207
            val_max = v;
208
        out[i] = v;
209
    }
210
    *val_max_ptr = val_max;
211
}
212
213
/**
214
 * decode exponents coded with LSP coefficients (same idea as Vorbis)
215
 */
216
static void decode_exp_lsp(WMACodecContext *s, int ch)
217
{
218
    float lsp_coefs[NB_LSP_COEFS];
219
    int val, i;
220
221
    for (i = 0; i < NB_LSP_COEFS; i++) {
222
        if (i == 0 || i >= 8)
223
            val = get_bits(&s->gb, 3);
224
        else
225
            val = get_bits(&s->gb, 4);
226
        lsp_coefs[i] = ff_wma_lsp_codebook[i][val];
227
    }
228
229
    wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch],
230
                     s->block_len, lsp_coefs);
231
}
232
233
/** pow(10, i / 16.0) for i in -60..95 */
234
static const float pow_tab[] = {
235
    1.7782794100389e-04, 2.0535250264571e-04,
236
    2.3713737056617e-04, 2.7384196342644e-04,
237
    3.1622776601684e-04, 3.6517412725484e-04,
238
    4.2169650342858e-04, 4.8696752516586e-04,
239
    5.6234132519035e-04, 6.4938163157621e-04,
240
    7.4989420933246e-04, 8.6596432336006e-04,
241
    1.0000000000000e-03, 1.1547819846895e-03,
242
    1.3335214321633e-03, 1.5399265260595e-03,
243
    1.7782794100389e-03, 2.0535250264571e-03,
244
    2.3713737056617e-03, 2.7384196342644e-03,
245
    3.1622776601684e-03, 3.6517412725484e-03,
246
    4.2169650342858e-03, 4.8696752516586e-03,
247
    5.6234132519035e-03, 6.4938163157621e-03,
248
    7.4989420933246e-03, 8.6596432336006e-03,
249
    1.0000000000000e-02, 1.1547819846895e-02,
250
    1.3335214321633e-02, 1.5399265260595e-02,
251
    1.7782794100389e-02, 2.0535250264571e-02,
252
    2.3713737056617e-02, 2.7384196342644e-02,
253
    3.1622776601684e-02, 3.6517412725484e-02,
254
    4.2169650342858e-02, 4.8696752516586e-02,
255
    5.6234132519035e-02, 6.4938163157621e-02,
256
    7.4989420933246e-02, 8.6596432336007e-02,
257
    1.0000000000000e-01, 1.1547819846895e-01,
258
    1.3335214321633e-01, 1.5399265260595e-01,
259
    1.7782794100389e-01, 2.0535250264571e-01,
260
    2.3713737056617e-01, 2.7384196342644e-01,
261
    3.1622776601684e-01, 3.6517412725484e-01,
262
    4.2169650342858e-01, 4.8696752516586e-01,
263
    5.6234132519035e-01, 6.4938163157621e-01,
264
    7.4989420933246e-01, 8.6596432336007e-01,
265
    1.0000000000000e+00, 1.1547819846895e+00,
266
    1.3335214321633e+00, 1.5399265260595e+00,
267
    1.7782794100389e+00, 2.0535250264571e+00,
268
    2.3713737056617e+00, 2.7384196342644e+00,
269
    3.1622776601684e+00, 3.6517412725484e+00,
270
    4.2169650342858e+00, 4.8696752516586e+00,
271
    5.6234132519035e+00, 6.4938163157621e+00,
272
    7.4989420933246e+00, 8.6596432336007e+00,
273
    1.0000000000000e+01, 1.1547819846895e+01,
274
    1.3335214321633e+01, 1.5399265260595e+01,
275
    1.7782794100389e+01, 2.0535250264571e+01,
276
    2.3713737056617e+01, 2.7384196342644e+01,
277
    3.1622776601684e+01, 3.6517412725484e+01,
278
    4.2169650342858e+01, 4.8696752516586e+01,
279
    5.6234132519035e+01, 6.4938163157621e+01,
280
    7.4989420933246e+01, 8.6596432336007e+01,
281
    1.0000000000000e+02, 1.1547819846895e+02,
282
    1.3335214321633e+02, 1.5399265260595e+02,
283
    1.7782794100389e+02, 2.0535250264571e+02,
284
    2.3713737056617e+02, 2.7384196342644e+02,
285
    3.1622776601684e+02, 3.6517412725484e+02,
286
    4.2169650342858e+02, 4.8696752516586e+02,
287
    5.6234132519035e+02, 6.4938163157621e+02,
288
    7.4989420933246e+02, 8.6596432336007e+02,
289
    1.0000000000000e+03, 1.1547819846895e+03,
290
    1.3335214321633e+03, 1.5399265260595e+03,
291
    1.7782794100389e+03, 2.0535250264571e+03,
292
    2.3713737056617e+03, 2.7384196342644e+03,
293
    3.1622776601684e+03, 3.6517412725484e+03,
294
    4.2169650342858e+03, 4.8696752516586e+03,
295
    5.6234132519035e+03, 6.4938163157621e+03,
296
    7.4989420933246e+03, 8.6596432336007e+03,
297
    1.0000000000000e+04, 1.1547819846895e+04,
298
    1.3335214321633e+04, 1.5399265260595e+04,
299
    1.7782794100389e+04, 2.0535250264571e+04,
300
    2.3713737056617e+04, 2.7384196342644e+04,
301
    3.1622776601684e+04, 3.6517412725484e+04,
302
    4.2169650342858e+04, 4.8696752516586e+04,
303
    5.6234132519035e+04, 6.4938163157621e+04,
304
    7.4989420933246e+04, 8.6596432336007e+04,
305
    1.0000000000000e+05, 1.1547819846895e+05,
306
    1.3335214321633e+05, 1.5399265260595e+05,
307
    1.7782794100389e+05, 2.0535250264571e+05,
308
    2.3713737056617e+05, 2.7384196342644e+05,
309
    3.1622776601684e+05, 3.6517412725484e+05,
310
    4.2169650342858e+05, 4.8696752516586e+05,
311
    5.6234132519035e+05, 6.4938163157621e+05,
312
    7.4989420933246e+05, 8.6596432336007e+05,
313
};
314
315
/**
316
 * decode exponents coded with VLC codes
317
 */
318
1136
static int decode_exp_vlc(WMACodecContext *s, int ch)
319
{
320
    int last_exp, n, code;
321
    const uint16_t *ptr;
322
    float v, max_scale;
323
    uint32_t *q, *q_end, iv;
324
1136
    const float *ptab = pow_tab + 60;
325
1136
    const uint32_t *iptab = (const uint32_t *) ptab;
326
327
1136
    ptr       = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
328
1136
    q         = (uint32_t *) s->exponents[ch];
329
1136
    q_end     = q + s->block_len;
330
1136
    max_scale = 0;
331
1136
    if (s->version == 1) {
332
410
        last_exp  = get_bits(&s->gb, 5) + 10;
333
410
        v         = ptab[last_exp];
334
410
        iv        = iptab[last_exp];
335
410
        max_scale = v;
336
410
        n         = *ptr++;
337

410
        switch (n & 3) do {
338
820
        case 0: *q++ = iv;
339
820
        case 3: *q++ = iv;
340
820
        case 2: *q++ = iv;
341
1230
        case 1: *q++ = iv;
342
1230
        } while ((n -= 4) > 0);
343
    } else
344
726
        last_exp = 36;
345
346
29126
    while (q < q_end) {
347
27990
        code = get_vlc2(&s->gb, s->exp_vlc.table, EXPVLCBITS, EXPMAX);
348
        /* NOTE: this offset is the same as MPEG-4 AAC! */
349
27990
        last_exp += code - 60;
350
27990
        if ((unsigned) last_exp + 60 >= FF_ARRAY_ELEMS(pow_tab)) {
351
            av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n",
352
                   last_exp);
353
            return -1;
354
        }
355
27990
        v  = ptab[last_exp];
356
27990
        iv = iptab[last_exp];
357
27990
        if (v > max_scale)
358
1141
            max_scale = v;
359
27990
        n = *ptr++;
360

27990
        switch (n & 3) do {
361
576712
        case 0: *q++ = iv;
362
579172
        case 3: *q++ = iv;
363
581632
        case 2: *q++ = iv;
364
585322
        case 1: *q++ = iv;
365
585322
        } while ((n -= 4) > 0);
366
    }
367
1136
    s->max_exponent[ch] = max_scale;
368
1136
    return 0;
369
}
370
371
/**
372
 * Apply MDCT window and add into output.
373
 *
374
 * We ensure that when the windows overlap their squared sum
375
 * is always 1 (MDCT reconstruction rule).
376
 */
377
1172
static void wma_window(WMACodecContext *s, float *out)
378
{
379
1172
    float *in = s->output;
380
    int block_len, bsize, n;
381
382
    /* left part */
383
1172
    if (s->block_len_bits <= s->prev_block_len_bits) {
384
1172
        block_len = s->block_len;
385
1172
        bsize     = s->frame_len_bits - s->block_len_bits;
386
387
1172
        s->fdsp->vector_fmul_add(out, in, s->windows[bsize],
388
                                out, block_len);
389
    } else {
390
        block_len = 1 << s->prev_block_len_bits;
391
        n         = (s->block_len - block_len) / 2;
392
        bsize     = s->frame_len_bits - s->prev_block_len_bits;
393
394
        s->fdsp->vector_fmul_add(out + n, in + n, s->windows[bsize],
395
                                out + n, block_len);
396
397
        memcpy(out + n + block_len, in + n + block_len, n * sizeof(float));
398
    }
399
400
1172
    out += s->block_len;
401
1172
    in  += s->block_len;
402
403
    /* right part */
404
1172
    if (s->block_len_bits <= s->next_block_len_bits) {
405
1172
        block_len = s->block_len;
406
1172
        bsize     = s->frame_len_bits - s->block_len_bits;
407
408
1172
        s->fdsp->vector_fmul_reverse(out, in, s->windows[bsize], block_len);
409
    } else {
410
        block_len = 1 << s->next_block_len_bits;
411
        n         = (s->block_len - block_len) / 2;
412
        bsize     = s->frame_len_bits - s->next_block_len_bits;
413
414
        memcpy(out, in, n * sizeof(float));
415
416
        s->fdsp->vector_fmul_reverse(out + n, in + n, s->windows[bsize],
417
                                    block_len);
418
419
        memset(out + n + block_len, 0, n * sizeof(float));
420
    }
421
1172
}
422
423
/**
424
 * @return 0 if OK. 1 if last block of frame. return -1 if
425
 * unrecoverable error.
426
 */
427
586
static int wma_decode_block(WMACodecContext *s)
428
{
429
    int n, v, a, ch, bsize;
430
    int coef_nb_bits, total_gain;
431
    int nb_coefs[MAX_CHANNELS];
432
    float mdct_norm;
433
    FFTContext *mdct;
434
435
#ifdef TRACE
436
    ff_tlog(s->avctx, "***decode_block: %d:%d\n",
437
            s->frame_count - 1, s->block_num);
438
#endif /* TRACE */
439
440
    /* compute current block length */
441
586
    if (s->use_variable_block_len) {
442
        n = av_log2(s->nb_block_sizes - 1) + 1;
443
444
        if (s->reset_block_lengths) {
445
            s->reset_block_lengths = 0;
446
            v                      = get_bits(&s->gb, n);
447
            if (v >= s->nb_block_sizes) {
448
                av_log(s->avctx, AV_LOG_ERROR,
449
                       "prev_block_len_bits %d out of range\n",
450
                       s->frame_len_bits - v);
451
                return -1;
452
            }
453
            s->prev_block_len_bits = s->frame_len_bits - v;
454
            v                      = get_bits(&s->gb, n);
455
            if (v >= s->nb_block_sizes) {
456
                av_log(s->avctx, AV_LOG_ERROR,
457
                       "block_len_bits %d out of range\n",
458
                       s->frame_len_bits - v);
459
                return -1;
460
            }
461
            s->block_len_bits = s->frame_len_bits - v;
462
        } else {
463
            /* update block lengths */
464
            s->prev_block_len_bits = s->block_len_bits;
465
            s->block_len_bits      = s->next_block_len_bits;
466
        }
467
        v = get_bits(&s->gb, n);
468
        if (v >= s->nb_block_sizes) {
469
            av_log(s->avctx, AV_LOG_ERROR,
470
                   "next_block_len_bits %d out of range\n",
471
                   s->frame_len_bits - v);
472
            return -1;
473
        }
474
        s->next_block_len_bits = s->frame_len_bits - v;
475
    } else {
476
        /* fixed block len */
477
586
        s->next_block_len_bits = s->frame_len_bits;
478
586
        s->prev_block_len_bits = s->frame_len_bits;
479
586
        s->block_len_bits      = s->frame_len_bits;
480
    }
481
482
586
    if (s->frame_len_bits - s->block_len_bits >= s->nb_block_sizes){
483
        av_log(s->avctx, AV_LOG_ERROR, "block_len_bits not initialized to a valid value\n");
484
        return -1;
485
    }
486
487
    /* now check if the block length is coherent with the frame length */
488
586
    s->block_len = 1 << s->block_len_bits;
489
586
    if ((s->block_pos + s->block_len) > s->frame_len) {
490
        av_log(s->avctx, AV_LOG_ERROR, "frame_len overflow\n");
491
        return -1;
492
    }
493
494
586
    if (s->avctx->channels == 2)
495
586
        s->ms_stereo = get_bits1(&s->gb);
496
586
    v = 0;
497
1758
    for (ch = 0; ch < s->avctx->channels; ch++) {
498
1172
        a                    = get_bits1(&s->gb);
499
1172
        s->channel_coded[ch] = a;
500
1172
        v                   |= a;
501
    }
502
503
586
    bsize = s->frame_len_bits - s->block_len_bits;
504
505
    /* if no channel coded, no need to go further */
506
    /* XXX: fix potential framing problems */
507
586
    if (!v)
508
        goto next;
509
510
    /* read total gain and extract corresponding number of bits for
511
     * coef escape coding */
512
586
    total_gain = 1;
513
    for (;;) {
514
586
        if (get_bits_left(&s->gb) < 7) {
515
            av_log(s->avctx, AV_LOG_ERROR, "total_gain overread\n");
516
            return AVERROR_INVALIDDATA;
517
        }
518
586
        a           = get_bits(&s->gb, 7);
519
586
        total_gain += a;
520
586
        if (a != 127)
521
586
            break;
522
    }
523
524
586
    coef_nb_bits = ff_wma_total_gain_to_bits(total_gain);
525
526
    /* compute number of coefficients */
527
586
    n = s->coefs_end[bsize] - s->coefs_start;
528
1758
    for (ch = 0; ch < s->avctx->channels; ch++)
529
1172
        nb_coefs[ch] = n;
530
531
    /* complex coding */
532
586
    if (s->use_noise_coding) {
533
        for (ch = 0; ch < s->avctx->channels; ch++) {
534
            if (s->channel_coded[ch]) {
535
                int i, n, a;
536
                n = s->exponent_high_sizes[bsize];
537
                for (i = 0; i < n; i++) {
538
                    a                         = get_bits1(&s->gb);
539
                    s->high_band_coded[ch][i] = a;
540
                    /* if noise coding, the coefficients are not transmitted */
541
                    if (a)
542
                        nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
543
                }
544
            }
545
        }
546
        for (ch = 0; ch < s->avctx->channels; ch++) {
547
            if (s->channel_coded[ch]) {
548
                int i, n, val;
549
550
                n   = s->exponent_high_sizes[bsize];
551
                val = (int) 0x80000000;
552
                for (i = 0; i < n; i++) {
553
                    if (s->high_band_coded[ch][i]) {
554
                        if (val == (int) 0x80000000) {
555
                            val = get_bits(&s->gb, 7) - 19;
556
                        } else {
557
                            val += get_vlc2(&s->gb, s->hgain_vlc.table,
558
                                            HGAINVLCBITS, HGAINMAX);
559
                        }
560
                        s->high_band_values[ch][i] = val;
561
                    }
562
                }
563
            }
564
        }
565
    }
566
567
    /* exponents can be reused in short blocks. */
568

586
    if ((s->block_len_bits == s->frame_len_bits) || get_bits1(&s->gb)) {
569
1758
        for (ch = 0; ch < s->avctx->channels; ch++) {
570
1172
            if (s->channel_coded[ch]) {
571
1136
                if (s->use_exp_vlc) {
572
1136
                    if (decode_exp_vlc(s, ch) < 0)
573
                        return -1;
574
                } else {
575
                    decode_exp_lsp(s, ch);
576
                }
577
1136
                s->exponents_bsize[ch] = bsize;
578
1136
                s->exponents_initialized[ch] = 1;
579
            }
580
        }
581
    }
582
583
1758
    for (ch = 0; ch < s->avctx->channels; ch++) {
584

1172
        if (s->channel_coded[ch] && !s->exponents_initialized[ch])
585
            return AVERROR_INVALIDDATA;
586
    }
587
588
    /* parse spectral coefficients : just RLE encoding */
589
1758
    for (ch = 0; ch < s->avctx->channels; ch++) {
590
1172
        if (s->channel_coded[ch]) {
591
            int tindex;
592
1136
            WMACoef *ptr = &s->coefs1[ch][0];
593
594
            /* special VLC tables are used for ms stereo because
595
             * there is potentially less energy there */
596

1136
            tindex = (ch == 1 && s->ms_stereo);
597
1136
            memset(ptr, 0, s->block_len * sizeof(WMACoef));
598
1136
            ff_wma_run_level_decode(s->avctx, &s->gb, &s->coef_vlc[tindex],
599
1136
                                    s->level_table[tindex], s->run_table[tindex],
600
                                    0, ptr, 0, nb_coefs[ch],
601
                                    s->block_len, s->frame_len_bits, coef_nb_bits);
602
        }
603

1172
        if (s->version == 1 && s->avctx->channels >= 2)
604
410
            align_get_bits(&s->gb);
605
    }
606
607
    /* normalize */
608
    {
609
586
        int n4 = s->block_len / 2;
610
586
        mdct_norm = 1.0 / (float) n4;
611
586
        if (s->version == 1)
612
205
            mdct_norm *= sqrt(n4);
613
    }
614
615
    /* finally compute the MDCT coefficients */
616
1758
    for (ch = 0; ch < s->avctx->channels; ch++) {
617
1172
        if (s->channel_coded[ch]) {
618
            WMACoef *coefs1;
619
            float *coefs, *exponents, mult, mult1, noise;
620
            int i, j, n, n1, last_high_band, esize;
621
            float exp_power[HIGH_BAND_MAX_SIZE];
622
623
1136
            coefs1    = s->coefs1[ch];
624
1136
            exponents = s->exponents[ch];
625
1136
            esize     = s->exponents_bsize[ch];
626
1136
            mult      = ff_exp10(total_gain * 0.05) / s->max_exponent[ch];
627
1136
            mult     *= mdct_norm;
628
1136
            coefs     = s->coefs[ch];
629
1136
            if (s->use_noise_coding) {
630
                mult1 = mult;
631
                /* very low freqs : noise */
632
                for (i = 0; i < s->coefs_start; i++) {
633
                    *coefs++ = s->noise_table[s->noise_index] *
634
                               exponents[i << bsize >> esize] * mult1;
635
                    s->noise_index = (s->noise_index + 1) &
636
                                     (NOISE_TAB_SIZE - 1);
637
                }
638
639
                n1 = s->exponent_high_sizes[bsize];
640
641
                /* compute power of high bands */
642
                exponents = s->exponents[ch] +
643
                            (s->high_band_start[bsize] << bsize >> esize);
644
                last_high_band = 0; /* avoid warning */
645
                for (j = 0; j < n1; j++) {
646
                    n = s->exponent_high_bands[s->frame_len_bits -
647
                                               s->block_len_bits][j];
648
                    if (s->high_band_coded[ch][j]) {
649
                        float e2, v;
650
                        e2 = 0;
651
                        for (i = 0; i < n; i++) {
652
                            v   = exponents[i << bsize >> esize];
653
                            e2 += v * v;
654
                        }
655
                        exp_power[j]   = e2 / n;
656
                        last_high_band = j;
657
                        ff_tlog(s->avctx, "%d: power=%f (%d)\n", j, exp_power[j], n);
658
                    }
659
                    exponents += n << bsize >> esize;
660
                }
661
662
                /* main freqs and high freqs */
663
                exponents = s->exponents[ch] + (s->coefs_start << bsize >> esize);
664
                for (j = -1; j < n1; j++) {
665
                    if (j < 0)
666
                        n = s->high_band_start[bsize] - s->coefs_start;
667
                    else
668
                        n = s->exponent_high_bands[s->frame_len_bits -
669
                                                   s->block_len_bits][j];
670
                    if (j >= 0 && s->high_band_coded[ch][j]) {
671
                        /* use noise with specified power */
672
                        mult1 = sqrt(exp_power[j] / exp_power[last_high_band]);
673
                        /* XXX: use a table */
674
                        mult1  = mult1 * ff_exp10(s->high_band_values[ch][j] * 0.05);
675
                        mult1  = mult1 / (s->max_exponent[ch] * s->noise_mult);
676
                        mult1 *= mdct_norm;
677
                        for (i = 0; i < n; i++) {
678
                            noise          = s->noise_table[s->noise_index];
679
                            s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
680
                            *coefs++       = noise * exponents[i << bsize >> esize] * mult1;
681
                        }
682
                        exponents += n << bsize >> esize;
683
                    } else {
684
                        /* coded values + small noise */
685
                        for (i = 0; i < n; i++) {
686
                            noise          = s->noise_table[s->noise_index];
687
                            s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
688
                            *coefs++       = ((*coefs1++) + noise) *
689
                                             exponents[i << bsize >> esize] * mult;
690
                        }
691
                        exponents += n << bsize >> esize;
692
                    }
693
                }
694
695
                /* very high freqs : noise */
696
                n     = s->block_len - s->coefs_end[bsize];
697
                mult1 = mult * exponents[(-(1 << bsize)) >> esize];
698
                for (i = 0; i < n; i++) {
699
                    *coefs++       = s->noise_table[s->noise_index] * mult1;
700
                    s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
701
                }
702
            } else {
703
                /* XXX: optimize more */
704
2366
                for (i = 0; i < s->coefs_start; i++)
705
1230
                    *coefs++ = 0.0;
706
1136
                n = nb_coefs[ch];
707
2117410
                for (i = 0; i < n; i++)
708
2116274
                    *coefs++ = coefs1[i] * exponents[i << bsize >> esize] * mult;
709
1136
                n = s->block_len - s->coefs_end[bsize];
710
210160
                for (i = 0; i < n; i++)
711
209024
                    *coefs++ = 0.0;
712
            }
713
        }
714
    }
715
716
#ifdef TRACE
717
    for (ch = 0; ch < s->avctx->channels; ch++) {
718
        if (s->channel_coded[ch]) {
719
            dump_floats(s, "exponents", 3, s->exponents[ch], s->block_len);
720
            dump_floats(s, "coefs", 1, s->coefs[ch], s->block_len);
721
        }
722
    }
723
#endif /* TRACE */
724
725

586
    if (s->ms_stereo && s->channel_coded[1]) {
726
        /* nominal case for ms stereo: we do it before mdct */
727
        /* no need to optimize this case because it should almost
728
         * never happen */
729
480
        if (!s->channel_coded[0]) {
730
            ff_tlog(s->avctx, "rare ms-stereo case happened\n");
731
            memset(s->coefs[0], 0, sizeof(float) * s->block_len);
732
            s->channel_coded[0] = 1;
733
        }
734
735
480
        s->fdsp->butterflies_float(s->coefs[0], s->coefs[1], s->block_len);
736
    }
737
738
106
next:
739
586
    mdct = &s->mdct_ctx[bsize];
740
741
1758
    for (ch = 0; ch < s->avctx->channels; ch++) {
742
        int n4, index;
743
744
1172
        n4 = s->block_len / 2;
745
1172
        if (s->channel_coded[ch])
746
1136
            mdct->imdct_calc(mdct, s->output, s->coefs[ch]);
747

36
        else if (!(s->ms_stereo && ch == 1))
748
35
            memset(s->output, 0, sizeof(s->output));
749
750
        /* multiply by the window and add in the frame */
751
1172
        index = (s->frame_len / 2) + s->block_pos - n4;
752
1172
        wma_window(s, &s->frame_out[ch][index]);
753
    }
754
755
    /* update block number */
756
586
    s->block_num++;
757
586
    s->block_pos += s->block_len;
758
586
    if (s->block_pos >= s->frame_len)
759
586
        return 1;
760
    else
761
        return 0;
762
}
763
764
/* decode a frame of frame_len samples */
765
586
static int wma_decode_frame(WMACodecContext *s, float **samples,
766
                            int samples_offset)
767
{
768
    int ret, ch;
769
770
#ifdef TRACE
771
    ff_tlog(s->avctx, "***decode_frame: %d size=%d\n",
772
            s->frame_count++, s->frame_len);
773
#endif /* TRACE */
774
775
    /* read each block */
776
586
    s->block_num = 0;
777
586
    s->block_pos = 0;
778
    for (;;) {
779
586
        ret = wma_decode_block(s);
780
586
        if (ret < 0)
781
            return -1;
782
586
        if (ret)
783
586
            break;
784
    }
785
786
1758
    for (ch = 0; ch < s->avctx->channels; ch++) {
787
        /* copy current block to output */
788
1172
        memcpy(samples[ch] + samples_offset, s->frame_out[ch],
789
1172
               s->frame_len * sizeof(*s->frame_out[ch]));
790
        /* prepare for next block */
791
1172
        memmove(&s->frame_out[ch][0], &s->frame_out[ch][s->frame_len],
792
1172
                s->frame_len * sizeof(*s->frame_out[ch]));
793
794
#ifdef TRACE
795
        dump_floats(s, "samples", 6, samples[ch] + samples_offset,
796
                    s->frame_len);
797
#endif /* TRACE */
798
    }
799
800
586
    return 0;
801
}
802
803
587
static int wma_decode_superframe(AVCodecContext *avctx, void *data,
804
                                 int *got_frame_ptr, AVPacket *avpkt)
805
{
806
587
    AVFrame *frame = data;
807
587
    const uint8_t *buf = avpkt->data;
808
587
    int buf_size       = avpkt->size;
809
587
    WMACodecContext *s = avctx->priv_data;
810
    int nb_frames, bit_offset, i, pos, len, ret;
811
    uint8_t *q;
812
    float **samples;
813
    int samples_offset;
814
815
    ff_tlog(avctx, "***decode_superframe:\n");
816
817
587
    if (buf_size == 0) {
818
        s->last_superframe_len = 0;
819
        return 0;
820
    }
821
587
    if (buf_size < avctx->block_align) {
822
1
        av_log(avctx, AV_LOG_ERROR,
823
               "Input packet size too small (%d < %d)\n",
824
               buf_size, avctx->block_align);
825
1
        return AVERROR_INVALIDDATA;
826
    }
827
586
    if (avctx->block_align)
828
586
        buf_size = avctx->block_align;
829
830
586
    init_get_bits(&s->gb, buf, buf_size * 8);
831
832
586
    if (s->use_bit_reservoir) {
833
        /* read super frame header */
834
        skip_bits(&s->gb, 4); /* super frame index */
835
        nb_frames = get_bits(&s->gb, 4) - (s->last_superframe_len <= 0);
836
        if (nb_frames <= 0) {
837
            int is_error = nb_frames < 0 || get_bits_left(&s->gb) <= 8;
838
            av_log(avctx, is_error ? AV_LOG_ERROR : AV_LOG_WARNING,
839
                   "nb_frames is %d bits left %d\n",
840
                   nb_frames, get_bits_left(&s->gb));
841
            if (is_error)
842
                return AVERROR_INVALIDDATA;
843
844
            if ((s->last_superframe_len + buf_size - 1) >
845
                MAX_CODED_SUPERFRAME_SIZE)
846
                goto fail;
847
848
            q   = s->last_superframe + s->last_superframe_len;
849
            len = buf_size - 1;
850
            while (len > 0) {
851
                *q++ = get_bits (&s->gb, 8);
852
                len --;
853
            }
854
            memset(q, 0, AV_INPUT_BUFFER_PADDING_SIZE);
855
856
            s->last_superframe_len += 8*buf_size - 8;
857
//             s->reset_block_lengths = 1; //XXX is this needed ?
858
            *got_frame_ptr = 0;
859
            return buf_size;
860
        }
861
    } else
862
586
        nb_frames = 1;
863
864
    /* get output buffer */
865
586
    frame->nb_samples = nb_frames * s->frame_len;
866
586
    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
867
        return ret;
868
586
    samples        = (float **) frame->extended_data;
869
586
    samples_offset = 0;
870
871
586
    if (s->use_bit_reservoir) {
872
        bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
873
        if (bit_offset > get_bits_left(&s->gb)) {
874
            av_log(avctx, AV_LOG_ERROR,
875
                   "Invalid last frame bit offset %d > buf size %d (%d)\n",
876
                   bit_offset, get_bits_left(&s->gb), buf_size);
877
            goto fail;
878
        }
879
880
        if (s->last_superframe_len > 0) {
881
            /* add bit_offset bits to last frame */
882
            if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) >
883
                MAX_CODED_SUPERFRAME_SIZE)
884
                goto fail;
885
            q   = s->last_superframe + s->last_superframe_len;
886
            len = bit_offset;
887
            while (len > 7) {
888
                *q++ = get_bits(&s->gb, 8);
889
                len -= 8;
890
            }
891
            if (len > 0)
892
                *q++ = get_bits(&s->gb, len) << (8 - len);
893
            memset(q, 0, AV_INPUT_BUFFER_PADDING_SIZE);
894
895
            /* XXX: bit_offset bits into last frame */
896
            init_get_bits(&s->gb, s->last_superframe,
897
                          s->last_superframe_len * 8 + bit_offset);
898
            /* skip unused bits */
899
            if (s->last_bitoffset > 0)
900
                skip_bits(&s->gb, s->last_bitoffset);
901
            /* this frame is stored in the last superframe and in the
902
             * current one */
903
            if (wma_decode_frame(s, samples, samples_offset) < 0)
904
                goto fail;
905
            samples_offset += s->frame_len;
906
            nb_frames--;
907
        }
908
909
        /* read each frame starting from bit_offset */
910
        pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
911
        if (pos >= MAX_CODED_SUPERFRAME_SIZE * 8 || pos > buf_size * 8)
912
            return AVERROR_INVALIDDATA;
913
        init_get_bits(&s->gb, buf + (pos >> 3), (buf_size - (pos >> 3)) * 8);
914
        len = pos & 7;
915
        if (len > 0)
916
            skip_bits(&s->gb, len);
917
918
        s->reset_block_lengths = 1;
919
        for (i = 0; i < nb_frames; i++) {
920
            if (wma_decode_frame(s, samples, samples_offset) < 0)
921
                goto fail;
922
            samples_offset += s->frame_len;
923
        }
924
925
        /* we copy the end of the frame in the last frame buffer */
926
        pos               = get_bits_count(&s->gb) +
927
                            ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7);
928
        s->last_bitoffset = pos & 7;
929
        pos             >>= 3;
930
        len               = buf_size - pos;
931
        if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) {
932
            av_log(s->avctx, AV_LOG_ERROR, "len %d invalid\n", len);
933
            goto fail;
934
        }
935
        s->last_superframe_len = len;
936
        memcpy(s->last_superframe, buf + pos, len);
937
    } else {
938
        /* single frame decode */
939
586
        if (wma_decode_frame(s, samples, samples_offset) < 0)
940
            goto fail;
941
586
        samples_offset += s->frame_len;
942
    }
943
944
    ff_dlog(s->avctx, "%d %d %d %d outbytes:%"PTRDIFF_SPECIFIER" eaten:%d\n",
945
            s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len,
946
            (int8_t *) samples - (int8_t *) data, avctx->block_align);
947
948
586
    *got_frame_ptr = 1;
949
950
586
    return buf_size;
951
952
fail:
953
    /* when error, we reset the bit reservoir */
954
    s->last_superframe_len = 0;
955
    return -1;
956
}
957
958
static av_cold void flush(AVCodecContext *avctx)
959
{
960
    WMACodecContext *s = avctx->priv_data;
961
962
    s->last_bitoffset      =
963
    s->last_superframe_len = 0;
964
}
965
966
#if CONFIG_WMAV1_DECODER
967
AVCodec ff_wmav1_decoder = {
968
    .name           = "wmav1",
969
    .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
970
    .type           = AVMEDIA_TYPE_AUDIO,
971
    .id             = AV_CODEC_ID_WMAV1,
972
    .priv_data_size = sizeof(WMACodecContext),
973
    .init           = wma_decode_init,
974
    .close          = ff_wma_end,
975
    .decode         = wma_decode_superframe,
976
    .flush          = flush,
977
    .capabilities   = AV_CODEC_CAP_DR1,
978
    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
979
                                                      AV_SAMPLE_FMT_NONE },
980
};
981
#endif
982
#if CONFIG_WMAV2_DECODER
983
AVCodec ff_wmav2_decoder = {
984
    .name           = "wmav2",
985
    .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
986
    .type           = AVMEDIA_TYPE_AUDIO,
987
    .id             = AV_CODEC_ID_WMAV2,
988
    .priv_data_size = sizeof(WMACodecContext),
989
    .init           = wma_decode_init,
990
    .close          = ff_wma_end,
991
    .decode         = wma_decode_superframe,
992
    .flush          = flush,
993
    .capabilities   = AV_CODEC_CAP_DR1,
994
    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
995
                                                      AV_SAMPLE_FMT_NONE },
996
};
997
#endif