FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/wmadec.c
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 239 465 51.4%
Branches: 127 276 46.0%

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 "config_components.h"
37
38 #include "libavutil/attributes.h"
39 #include "libavutil/ffmath.h"
40
41 #include "avcodec.h"
42 #include "codec_internal.h"
43 #include "decode.h"
44 #include "internal.h"
45 #include "wma.h"
46
47 #define EXPVLCBITS 8
48 #define EXPMAX ((19 + EXPVLCBITS - 1) / EXPVLCBITS)
49
50 #define HGAINVLCBITS 9
51 #define HGAINMAX ((13 + HGAINVLCBITS - 1) / HGAINVLCBITS)
52
53 static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len);
54
55 #ifdef TRACE
56 static void dump_floats(WMACodecContext *s, const char *name,
57 int prec, const float *tab, int n)
58 {
59 int i;
60
61 ff_tlog(s->avctx, "%s[%d]:\n", name, n);
62 for (i = 0; i < n; i++) {
63 if ((i & 7) == 0)
64 ff_tlog(s->avctx, "%4d: ", i);
65 ff_tlog(s->avctx, " %8.*f", prec, tab[i]);
66 if ((i & 7) == 7)
67 ff_tlog(s->avctx, "\n");
68 }
69 if ((i & 7) != 0)
70 ff_tlog(s->avctx, "\n");
71 }
72 #endif /* TRACE */
73
74 14 static av_cold int wma_decode_init(AVCodecContext *avctx)
75 {
76 14 WMACodecContext *s = avctx->priv_data;
77 int i, flags2, ret;
78 uint8_t *extradata;
79
80
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14 if (!avctx->block_align) {
81 av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
82 return AVERROR(EINVAL);
83 }
84
85 14 s->avctx = avctx;
86
87 /* extract flag info */
88 14 flags2 = 0;
89 14 extradata = avctx->extradata;
90
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14 if (avctx->codec->id == AV_CODEC_ID_WMAV1 && avctx->extradata_size >= 4)
91 2 flags2 = AV_RL16(extradata + 2);
92
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12 else if (avctx->codec->id == AV_CODEC_ID_WMAV2 && avctx->extradata_size >= 6)
93 12 flags2 = AV_RL16(extradata + 4);
94
95 14 s->use_exp_vlc = flags2 & 0x0001;
96 14 s->use_bit_reservoir = flags2 & 0x0002;
97 14 s->use_variable_block_len = flags2 & 0x0004;
98
99
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14 if (avctx->codec->id == AV_CODEC_ID_WMAV2 && avctx->extradata_size >= 8){
100
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11 if (AV_RL16(extradata+4)==0xd && s->use_variable_block_len){
101 av_log(avctx, AV_LOG_WARNING, "Disabling use_variable_block_len, if this fails contact the ffmpeg developers and send us the file\n");
102 s->use_variable_block_len= 0; // this fixes issue1503
103 }
104 }
105
106
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42 for (i=0; i<MAX_CHANNELS; i++)
107 28 s->max_exponent[i] = 1.0;
108
109
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14 if ((ret = ff_wma_init(avctx, flags2)) < 0)
110 return ret;
111
112 /* init MDCT */
113
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51 for (i = 0; i < s->nb_block_sizes; i++) {
114 37 float scale = 1.0 / 32768.0;
115 37 ret = av_tx_init(&s->mdct_ctx[i], &s->mdct_fn[i], AV_TX_FLOAT_MDCT,
116 37 1, 1 << (s->frame_len_bits - i), &scale, AV_TX_FULL_IMDCT);
117
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37 if (ret < 0)
118 return ret;
119 }
120
121
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14 if (s->use_noise_coding) {
122 2 ret = ff_init_vlc_from_lengths(&s->hgain_vlc, HGAINVLCBITS,
123 FF_ARRAY_ELEMS(ff_wma_hgain_hufftab),
124 &ff_wma_hgain_hufftab[0][1], 2,
125 &ff_wma_hgain_hufftab[0][0], 2, 1,
126 -18, 0, avctx);
127
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2 if (ret < 0)
128 return ret;
129 }
130
131
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14 if (s->use_exp_vlc) {
132 // FIXME move out of context
133 11 ret = init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(ff_aac_scalefactor_bits),
134 ff_aac_scalefactor_bits, 1, 1,
135 ff_aac_scalefactor_code, 4, 4, 0);
136
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11 if (ret < 0)
137 return ret;
138 } else
139 3 wma_lsp_to_curve_init(s, s->frame_len);
140
141 14 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
142
143 14 avctx->internal->skip_samples = s->frame_len * 2;
144
145 14 return 0;
146 }
147
148 /**
149 * compute x^-0.25 with an exponent and mantissa table. We use linear
150 * interpolation to reduce the mantissa table size at a small speed
151 * expense (linear interpolation approximately doubles the number of
152 * bits of precision).
153 */
154 static inline float pow_m1_4(WMACodecContext *s, float x)
155 {
156 union {
157 float f;
158 unsigned int v;
159 } u, t;
160 unsigned int e, m;
161 float a, b;
162
163 u.f = x;
164 e = u.v >> 23;
165 m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
166 /* build interpolation scale: 1 <= t < 2. */
167 t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
168 a = s->lsp_pow_m_table1[m];
169 b = s->lsp_pow_m_table2[m];
170 return s->lsp_pow_e_table[e] * (a + b * t.f);
171 }
172
173 3 static av_cold void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len)
174 {
175 float wdel, a, b;
176 int i, e, m;
177
178 3 wdel = M_PI / frame_len;
179
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1539 for (i = 0; i < frame_len; i++)
180 1536 s->lsp_cos_table[i] = 2.0f * cos(wdel * i);
181
182 /* tables for x^-0.25 computation */
183
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771 for (i = 0; i < 256; i++) {
184 768 e = i - 126;
185 768 s->lsp_pow_e_table[i] = exp2f(e * -0.25);
186 }
187
188 /* NOTE: these two tables are needed to avoid two operations in
189 * pow_m1_4 */
190 3 b = 1.0;
191
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387 for (i = (1 << LSP_POW_BITS) - 1; i >= 0; i--) {
192 384 m = (1 << LSP_POW_BITS) + i;
193 384 a = (float) m * (0.5 / (1 << LSP_POW_BITS));
194 384 a = 1/sqrt(sqrt(a));
195 384 s->lsp_pow_m_table1[i] = 2 * a - b;
196 384 s->lsp_pow_m_table2[i] = b - a;
197 384 b = a;
198 }
199 3 }
200
201 /**
202 * NOTE: We use the same code as Vorbis here
203 * @todo optimize it further with SSE/3Dnow
204 */
205 static void wma_lsp_to_curve(WMACodecContext *s, float *out, float *val_max_ptr,
206 int n, float *lsp)
207 {
208 int i, j;
209 float p, q, w, v, val_max;
210
211 val_max = 0;
212 for (i = 0; i < n; i++) {
213 p = 0.5f;
214 q = 0.5f;
215 w = s->lsp_cos_table[i];
216 for (j = 1; j < NB_LSP_COEFS; j += 2) {
217 q *= w - lsp[j - 1];
218 p *= w - lsp[j];
219 }
220 p *= p * (2.0f - w);
221 q *= q * (2.0f + w);
222 v = p + q;
223 v = pow_m1_4(s, v);
224 if (v > val_max)
225 val_max = v;
226 out[i] = v;
227 }
228 *val_max_ptr = val_max;
229 }
230
231 /**
232 * decode exponents coded with LSP coefficients (same idea as Vorbis)
233 */
234 static void decode_exp_lsp(WMACodecContext *s, int ch)
235 {
236 float lsp_coefs[NB_LSP_COEFS];
237 int val, i;
238
239 for (i = 0; i < NB_LSP_COEFS; i++) {
240 if (i == 0 || i >= 8)
241 val = get_bits(&s->gb, 3);
242 else
243 val = get_bits(&s->gb, 4);
244 lsp_coefs[i] = ff_wma_lsp_codebook[i][val];
245 }
246
247 wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch],
248 s->block_len, lsp_coefs);
249 }
250
251 /** pow(10, i / 16.0) for i in -60..95 */
252 static const float pow_tab[] = {
253 1.7782794100389e-04, 2.0535250264571e-04,
254 2.3713737056617e-04, 2.7384196342644e-04,
255 3.1622776601684e-04, 3.6517412725484e-04,
256 4.2169650342858e-04, 4.8696752516586e-04,
257 5.6234132519035e-04, 6.4938163157621e-04,
258 7.4989420933246e-04, 8.6596432336006e-04,
259 1.0000000000000e-03, 1.1547819846895e-03,
260 1.3335214321633e-03, 1.5399265260595e-03,
261 1.7782794100389e-03, 2.0535250264571e-03,
262 2.3713737056617e-03, 2.7384196342644e-03,
263 3.1622776601684e-03, 3.6517412725484e-03,
264 4.2169650342858e-03, 4.8696752516586e-03,
265 5.6234132519035e-03, 6.4938163157621e-03,
266 7.4989420933246e-03, 8.6596432336006e-03,
267 1.0000000000000e-02, 1.1547819846895e-02,
268 1.3335214321633e-02, 1.5399265260595e-02,
269 1.7782794100389e-02, 2.0535250264571e-02,
270 2.3713737056617e-02, 2.7384196342644e-02,
271 3.1622776601684e-02, 3.6517412725484e-02,
272 4.2169650342858e-02, 4.8696752516586e-02,
273 5.6234132519035e-02, 6.4938163157621e-02,
274 7.4989420933246e-02, 8.6596432336007e-02,
275 1.0000000000000e-01, 1.1547819846895e-01,
276 1.3335214321633e-01, 1.5399265260595e-01,
277 1.7782794100389e-01, 2.0535250264571e-01,
278 2.3713737056617e-01, 2.7384196342644e-01,
279 3.1622776601684e-01, 3.6517412725484e-01,
280 4.2169650342858e-01, 4.8696752516586e-01,
281 5.6234132519035e-01, 6.4938163157621e-01,
282 7.4989420933246e-01, 8.6596432336007e-01,
283 1.0000000000000e+00, 1.1547819846895e+00,
284 1.3335214321633e+00, 1.5399265260595e+00,
285 1.7782794100389e+00, 2.0535250264571e+00,
286 2.3713737056617e+00, 2.7384196342644e+00,
287 3.1622776601684e+00, 3.6517412725484e+00,
288 4.2169650342858e+00, 4.8696752516586e+00,
289 5.6234132519035e+00, 6.4938163157621e+00,
290 7.4989420933246e+00, 8.6596432336007e+00,
291 1.0000000000000e+01, 1.1547819846895e+01,
292 1.3335214321633e+01, 1.5399265260595e+01,
293 1.7782794100389e+01, 2.0535250264571e+01,
294 2.3713737056617e+01, 2.7384196342644e+01,
295 3.1622776601684e+01, 3.6517412725484e+01,
296 4.2169650342858e+01, 4.8696752516586e+01,
297 5.6234132519035e+01, 6.4938163157621e+01,
298 7.4989420933246e+01, 8.6596432336007e+01,
299 1.0000000000000e+02, 1.1547819846895e+02,
300 1.3335214321633e+02, 1.5399265260595e+02,
301 1.7782794100389e+02, 2.0535250264571e+02,
302 2.3713737056617e+02, 2.7384196342644e+02,
303 3.1622776601684e+02, 3.6517412725484e+02,
304 4.2169650342858e+02, 4.8696752516586e+02,
305 5.6234132519035e+02, 6.4938163157621e+02,
306 7.4989420933246e+02, 8.6596432336007e+02,
307 1.0000000000000e+03, 1.1547819846895e+03,
308 1.3335214321633e+03, 1.5399265260595e+03,
309 1.7782794100389e+03, 2.0535250264571e+03,
310 2.3713737056617e+03, 2.7384196342644e+03,
311 3.1622776601684e+03, 3.6517412725484e+03,
312 4.2169650342858e+03, 4.8696752516586e+03,
313 5.6234132519035e+03, 6.4938163157621e+03,
314 7.4989420933246e+03, 8.6596432336007e+03,
315 1.0000000000000e+04, 1.1547819846895e+04,
316 1.3335214321633e+04, 1.5399265260595e+04,
317 1.7782794100389e+04, 2.0535250264571e+04,
318 2.3713737056617e+04, 2.7384196342644e+04,
319 3.1622776601684e+04, 3.6517412725484e+04,
320 4.2169650342858e+04, 4.8696752516586e+04,
321 5.6234132519035e+04, 6.4938163157621e+04,
322 7.4989420933246e+04, 8.6596432336007e+04,
323 1.0000000000000e+05, 1.1547819846895e+05,
324 1.3335214321633e+05, 1.5399265260595e+05,
325 1.7782794100389e+05, 2.0535250264571e+05,
326 2.3713737056617e+05, 2.7384196342644e+05,
327 3.1622776601684e+05, 3.6517412725484e+05,
328 4.2169650342858e+05, 4.8696752516586e+05,
329 5.6234132519035e+05, 6.4938163157621e+05,
330 7.4989420933246e+05, 8.6596432336007e+05,
331 };
332
333 /**
334 * decode exponents coded with VLC codes
335 */
336 1136 static int decode_exp_vlc(WMACodecContext *s, int ch)
337 {
338 int last_exp, n, code;
339 const uint16_t *ptr;
340 float v, max_scale;
341 uint32_t *q, *q_end, iv;
342 1136 const float *ptab = pow_tab + 60;
343 1136 const uint32_t *iptab = (const uint32_t *) ptab;
344
345 1136 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
346 1136 q = (uint32_t *) s->exponents[ch];
347 1136 q_end = q + s->block_len;
348 1136 max_scale = 0;
349
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1136 if (s->version == 1) {
350 410 last_exp = get_bits(&s->gb, 5) + 10;
351 410 v = ptab[last_exp];
352 410 iv = iptab[last_exp];
353 410 max_scale = v;
354 410 n = *ptr++;
355
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410 switch (n & 3) do {
356 820 case 0: *q++ = iv;
357 820 case 3: *q++ = iv;
358 820 case 2: *q++ = iv;
359 1230 case 1: *q++ = iv;
360
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1230 } while ((n -= 4) > 0);
361 } else
362 726 last_exp = 36;
363
364
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29126 while (q < q_end) {
365 27990 code = get_vlc2(&s->gb, s->exp_vlc.table, EXPVLCBITS, EXPMAX);
366 /* NOTE: this offset is the same as MPEG-4 AAC! */
367 27990 last_exp += code - 60;
368
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27990 if ((unsigned) last_exp + 60 >= FF_ARRAY_ELEMS(pow_tab)) {
369 av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n",
370 last_exp);
371 return -1;
372 }
373 27990 v = ptab[last_exp];
374 27990 iv = iptab[last_exp];
375
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27990 if (v > max_scale)
376 1141 max_scale = v;
377 27990 n = *ptr++;
378
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27990 switch (n & 3) do {
379 576712 case 0: *q++ = iv;
380 579172 case 3: *q++ = iv;
381 581632 case 2: *q++ = iv;
382 585322 case 1: *q++ = iv;
383
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585322 } while ((n -= 4) > 0);
384 }
385 1136 s->max_exponent[ch] = max_scale;
386 1136 return 0;
387 }
388
389 /**
390 * Apply MDCT window and add into output.
391 *
392 * We ensure that when the windows overlap their squared sum
393 * is always 1 (MDCT reconstruction rule).
394 */
395 1172 static void wma_window(WMACodecContext *s, float *out)
396 {
397 1172 float *in = s->output;
398 int block_len, bsize, n;
399
400 /* left part */
401
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1172 if (s->block_len_bits <= s->prev_block_len_bits) {
402 1172 block_len = s->block_len;
403 1172 bsize = s->frame_len_bits - s->block_len_bits;
404
405 1172 s->fdsp->vector_fmul_add(out, in, s->windows[bsize],
406 out, block_len);
407 } else {
408 block_len = 1 << s->prev_block_len_bits;
409 n = (s->block_len - block_len) / 2;
410 bsize = s->frame_len_bits - s->prev_block_len_bits;
411
412 s->fdsp->vector_fmul_add(out + n, in + n, s->windows[bsize],
413 out + n, block_len);
414
415 memcpy(out + n + block_len, in + n + block_len, n * sizeof(float));
416 }
417
418 1172 out += s->block_len;
419 1172 in += s->block_len;
420
421 /* right part */
422
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1172 if (s->block_len_bits <= s->next_block_len_bits) {
423 1172 block_len = s->block_len;
424 1172 bsize = s->frame_len_bits - s->block_len_bits;
425
426 1172 s->fdsp->vector_fmul_reverse(out, in, s->windows[bsize], block_len);
427 } else {
428 block_len = 1 << s->next_block_len_bits;
429 n = (s->block_len - block_len) / 2;
430 bsize = s->frame_len_bits - s->next_block_len_bits;
431
432 memcpy(out, in, n * sizeof(float));
433
434 s->fdsp->vector_fmul_reverse(out + n, in + n, s->windows[bsize],
435 block_len);
436
437 memset(out + n + block_len, 0, n * sizeof(float));
438 }
439 1172 }
440
441 /**
442 * @return 0 if OK. 1 if last block of frame. return -1 if
443 * unrecoverable error.
444 */
445 586 static int wma_decode_block(WMACodecContext *s)
446 {
447 586 int channels = s->avctx->ch_layout.nb_channels;
448 int n, v, a, ch, bsize;
449 int coef_nb_bits, total_gain;
450 int nb_coefs[MAX_CHANNELS];
451 float mdct_norm;
452 AVTXContext *mdct;
453 av_tx_fn mdct_fn;
454
455 #ifdef TRACE
456 ff_tlog(s->avctx, "***decode_block: %d:%d\n",
457 s->frame_count - 1, s->block_num);
458 #endif /* TRACE */
459
460 /* compute current block length */
461
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586 if (s->use_variable_block_len) {
462 n = av_log2(s->nb_block_sizes - 1) + 1;
463
464 if (s->reset_block_lengths) {
465 s->reset_block_lengths = 0;
466 v = get_bits(&s->gb, n);
467 if (v >= s->nb_block_sizes) {
468 av_log(s->avctx, AV_LOG_ERROR,
469 "prev_block_len_bits %d out of range\n",
470 s->frame_len_bits - v);
471 return -1;
472 }
473 s->prev_block_len_bits = s->frame_len_bits - v;
474 v = get_bits(&s->gb, n);
475 if (v >= s->nb_block_sizes) {
476 av_log(s->avctx, AV_LOG_ERROR,
477 "block_len_bits %d out of range\n",
478 s->frame_len_bits - v);
479 return -1;
480 }
481 s->block_len_bits = s->frame_len_bits - v;
482 } else {
483 /* update block lengths */
484 s->prev_block_len_bits = s->block_len_bits;
485 s->block_len_bits = s->next_block_len_bits;
486 }
487 v = get_bits(&s->gb, n);
488 if (v >= s->nb_block_sizes) {
489 av_log(s->avctx, AV_LOG_ERROR,
490 "next_block_len_bits %d out of range\n",
491 s->frame_len_bits - v);
492 return -1;
493 }
494 s->next_block_len_bits = s->frame_len_bits - v;
495 } else {
496 /* fixed block len */
497 586 s->next_block_len_bits = s->frame_len_bits;
498 586 s->prev_block_len_bits = s->frame_len_bits;
499 586 s->block_len_bits = s->frame_len_bits;
500 }
501
502
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586 if (s->frame_len_bits - s->block_len_bits >= s->nb_block_sizes){
503 av_log(s->avctx, AV_LOG_ERROR, "block_len_bits not initialized to a valid value\n");
504 return -1;
505 }
506
507 /* now check if the block length is coherent with the frame length */
508 586 s->block_len = 1 << s->block_len_bits;
509
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586 if ((s->block_pos + s->block_len) > s->frame_len) {
510 av_log(s->avctx, AV_LOG_ERROR, "frame_len overflow\n");
511 return -1;
512 }
513
514
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586 if (channels == 2)
515 586 s->ms_stereo = get_bits1(&s->gb);
516 586 v = 0;
517
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1758 for (ch = 0; ch < channels; ch++) {
518 1172 a = get_bits1(&s->gb);
519 1172 s->channel_coded[ch] = a;
520 1172 v |= a;
521 }
522
523 586 bsize = s->frame_len_bits - s->block_len_bits;
524
525 /* if no channel coded, no need to go further */
526 /* XXX: fix potential framing problems */
527
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586 if (!v)
528 goto next;
529
530 /* read total gain and extract corresponding number of bits for
531 * coef escape coding */
532 586 total_gain = 1;
533 for (;;) {
534
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586 if (get_bits_left(&s->gb) < 7) {
535 av_log(s->avctx, AV_LOG_ERROR, "total_gain overread\n");
536 return AVERROR_INVALIDDATA;
537 }
538 586 a = get_bits(&s->gb, 7);
539 586 total_gain += a;
540
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586 if (a != 127)
541 586 break;
542 }
543
544 586 coef_nb_bits = ff_wma_total_gain_to_bits(total_gain);
545
546 /* compute number of coefficients */
547 586 n = s->coefs_end[bsize] - s->coefs_start;
548
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1758 for (ch = 0; ch < channels; ch++)
549 1172 nb_coefs[ch] = n;
550
551 /* complex coding */
552
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586 if (s->use_noise_coding) {
553 for (ch = 0; ch < channels; ch++) {
554 if (s->channel_coded[ch]) {
555 int i, n, a;
556 n = s->exponent_high_sizes[bsize];
557 for (i = 0; i < n; i++) {
558 a = get_bits1(&s->gb);
559 s->high_band_coded[ch][i] = a;
560 /* if noise coding, the coefficients are not transmitted */
561 if (a)
562 nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
563 }
564 }
565 }
566 for (ch = 0; ch < channels; ch++) {
567 if (s->channel_coded[ch]) {
568 int i, n, val;
569
570 n = s->exponent_high_sizes[bsize];
571 val = (int) 0x80000000;
572 for (i = 0; i < n; i++) {
573 if (s->high_band_coded[ch][i]) {
574 if (val == (int) 0x80000000) {
575 val = get_bits(&s->gb, 7) - 19;
576 } else {
577 val += get_vlc2(&s->gb, s->hgain_vlc.table,
578 HGAINVLCBITS, HGAINMAX);
579 }
580 s->high_band_values[ch][i] = val;
581 }
582 }
583 }
584 }
585 }
586
587 /* exponents can be reused in short blocks. */
588
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586 if ((s->block_len_bits == s->frame_len_bits) || get_bits1(&s->gb)) {
589
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1758 for (ch = 0; ch < channels; ch++) {
590
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1172 if (s->channel_coded[ch]) {
591
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1136 if (s->use_exp_vlc) {
592
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1136 if (decode_exp_vlc(s, ch) < 0)
593 return -1;
594 } else {
595 decode_exp_lsp(s, ch);
596 }
597 1136 s->exponents_bsize[ch] = bsize;
598 1136 s->exponents_initialized[ch] = 1;
599 }
600 }
601 }
602
603
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1758 for (ch = 0; ch < channels; ch++) {
604
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1172 if (s->channel_coded[ch] && !s->exponents_initialized[ch])
605 return AVERROR_INVALIDDATA;
606 }
607
608 /* parse spectral coefficients : just RLE encoding */
609
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1758 for (ch = 0; ch < channels; ch++) {
610
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1172 if (s->channel_coded[ch]) {
611 int tindex;
612 1136 WMACoef *ptr = &s->coefs1[ch][0];
613 int ret;
614
615 /* special VLC tables are used for ms stereo because
616 * there is potentially less energy there */
617
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1136 tindex = (ch == 1 && s->ms_stereo);
618 1136 memset(ptr, 0, s->block_len * sizeof(WMACoef));
619 1136 ret = ff_wma_run_level_decode(s->avctx, &s->gb, &s->coef_vlc[tindex],
620 1136 s->level_table[tindex], s->run_table[tindex],
621 0, ptr, 0, nb_coefs[ch],
622 s->block_len, s->frame_len_bits, coef_nb_bits);
623
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1136 if (ret < 0)
624 return ret;
625 }
626
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1172 if (s->version == 1 && channels >= 2)
627 410 align_get_bits(&s->gb);
628 }
629
630 /* normalize */
631 {
632 586 int n4 = s->block_len / 2;
633 586 mdct_norm = 1.0 / (float) n4;
634
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586 if (s->version == 1)
635 205 mdct_norm *= sqrt(n4);
636 }
637
638 /* finally compute the MDCT coefficients */
639
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1758 for (ch = 0; ch < channels; ch++) {
640
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1172 if (s->channel_coded[ch]) {
641 WMACoef *coefs1;
642 float *coefs, *exponents, mult, mult1, noise;
643 int i, j, n, n1, last_high_band, esize;
644 float exp_power[HIGH_BAND_MAX_SIZE];
645
646 1136 coefs1 = s->coefs1[ch];
647 1136 exponents = s->exponents[ch];
648 1136 esize = s->exponents_bsize[ch];
649 1136 mult = ff_exp10(total_gain * 0.05) / s->max_exponent[ch];
650 1136 mult *= mdct_norm;
651 1136 coefs = s->coefs[ch];
652
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1136 if (s->use_noise_coding) {
653 mult1 = mult;
654 /* very low freqs : noise */
655 for (i = 0; i < s->coefs_start; i++) {
656 *coefs++ = s->noise_table[s->noise_index] *
657 exponents[i << bsize >> esize] * mult1;
658 s->noise_index = (s->noise_index + 1) &
659 (NOISE_TAB_SIZE - 1);
660 }
661
662 n1 = s->exponent_high_sizes[bsize];
663
664 /* compute power of high bands */
665 exponents = s->exponents[ch] +
666 (s->high_band_start[bsize] << bsize >> esize);
667 last_high_band = 0; /* avoid warning */
668 for (j = 0; j < n1; j++) {
669 n = s->exponent_high_bands[s->frame_len_bits -
670 s->block_len_bits][j];
671 if (s->high_band_coded[ch][j]) {
672 float e2, v;
673 e2 = 0;
674 for (i = 0; i < n; i++) {
675 v = exponents[i << bsize >> esize];
676 e2 += v * v;
677 }
678 exp_power[j] = e2 / n;
679 last_high_band = j;
680 ff_tlog(s->avctx, "%d: power=%f (%d)\n", j, exp_power[j], n);
681 }
682 exponents += n << bsize >> esize;
683 }
684
685 /* main freqs and high freqs */
686 exponents = s->exponents[ch] + (s->coefs_start << bsize >> esize);
687 for (j = -1; j < n1; j++) {
688 if (j < 0)
689 n = s->high_band_start[bsize] - s->coefs_start;
690 else
691 n = s->exponent_high_bands[s->frame_len_bits -
692 s->block_len_bits][j];
693 if (j >= 0 && s->high_band_coded[ch][j]) {
694 /* use noise with specified power */
695 mult1 = sqrt(exp_power[j] / exp_power[last_high_band]);
696 /* XXX: use a table */
697 mult1 = mult1 * ff_exp10(s->high_band_values[ch][j] * 0.05);
698 mult1 = mult1 / (s->max_exponent[ch] * s->noise_mult);
699 mult1 *= mdct_norm;
700 for (i = 0; i < n; i++) {
701 noise = s->noise_table[s->noise_index];
702 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
703 *coefs++ = noise * exponents[i << bsize >> esize] * mult1;
704 }
705 exponents += n << bsize >> esize;
706 } else {
707 /* coded values + small noise */
708 for (i = 0; i < n; i++) {
709 noise = s->noise_table[s->noise_index];
710 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
711 *coefs++ = ((*coefs1++) + noise) *
712 exponents[i << bsize >> esize] * mult;
713 }
714 exponents += n << bsize >> esize;
715 }
716 }
717
718 /* very high freqs : noise */
719 n = s->block_len - s->coefs_end[bsize];
720 mult1 = mult * exponents[(-(1 << bsize)) >> esize];
721 for (i = 0; i < n; i++) {
722 *coefs++ = s->noise_table[s->noise_index] * mult1;
723 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
724 }
725 } else {
726 /* XXX: optimize more */
727
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2366 for (i = 0; i < s->coefs_start; i++)
728 1230 *coefs++ = 0.0;
729 1136 n = nb_coefs[ch];
730
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2117410 for (i = 0; i < n; i++)
731 2116274 *coefs++ = coefs1[i] * exponents[i << bsize >> esize] * mult;
732 1136 n = s->block_len - s->coefs_end[bsize];
733
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210160 for (i = 0; i < n; i++)
734 209024 *coefs++ = 0.0;
735 }
736 }
737 }
738
739 #ifdef TRACE
740 for (ch = 0; ch < channels; ch++) {
741 if (s->channel_coded[ch]) {
742 dump_floats(s, "exponents", 3, s->exponents[ch], s->block_len);
743 dump_floats(s, "coefs", 1, s->coefs[ch], s->block_len);
744 }
745 }
746 #endif /* TRACE */
747
748
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586 if (s->ms_stereo && s->channel_coded[1]) {
749 /* nominal case for ms stereo: we do it before mdct */
750 /* no need to optimize this case because it should almost
751 * never happen */
752
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480 if (!s->channel_coded[0]) {
753 ff_tlog(s->avctx, "rare ms-stereo case happened\n");
754 memset(s->coefs[0], 0, sizeof(float) * s->block_len);
755 s->channel_coded[0] = 1;
756 }
757
758 480 s->fdsp->butterflies_float(s->coefs[0], s->coefs[1], s->block_len);
759 }
760
761 106 next:
762 586 mdct = s->mdct_ctx[bsize];
763 586 mdct_fn = s->mdct_fn[bsize];
764
765
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1758 for (ch = 0; ch < channels; ch++) {
766 int n4, index;
767
768 1172 n4 = s->block_len / 2;
769
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1172 if (s->channel_coded[ch])
770 1136 mdct_fn(mdct, s->output, s->coefs[ch], sizeof(float));
771
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36 else if (!(s->ms_stereo && ch == 1))
772 35 memset(s->output, 0, sizeof(s->output));
773
774 /* multiply by the window and add in the frame */
775 1172 index = (s->frame_len / 2) + s->block_pos - n4;
776 1172 wma_window(s, &s->frame_out[ch][index]);
777 }
778
779 /* update block number */
780 586 s->block_num++;
781 586 s->block_pos += s->block_len;
782
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586 if (s->block_pos >= s->frame_len)
783 586 return 1;
784 else
785 return 0;
786 }
787
788 /* decode a frame of frame_len samples */
789 586 static int wma_decode_frame(WMACodecContext *s, float **samples,
790 int samples_offset)
791 {
792 int ret, ch;
793
794 #ifdef TRACE
795 ff_tlog(s->avctx, "***decode_frame: %d size=%d\n",
796 s->frame_count++, s->frame_len);
797 #endif /* TRACE */
798
799 /* read each block */
800 586 s->block_num = 0;
801 586 s->block_pos = 0;
802 for (;;) {
803 586 ret = wma_decode_block(s);
804
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586 if (ret < 0)
805 return -1;
806
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586 if (ret)
807 586 break;
808 }
809
810
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1758 for (ch = 0; ch < s->avctx->ch_layout.nb_channels; ch++) {
811 /* copy current block to output */
812 1172 memcpy(samples[ch] + samples_offset, s->frame_out[ch],
813 1172 s->frame_len * sizeof(*s->frame_out[ch]));
814 /* prepare for next block */
815 1172 memmove(&s->frame_out[ch][0], &s->frame_out[ch][s->frame_len],
816 1172 s->frame_len * sizeof(*s->frame_out[ch]));
817
818 #ifdef TRACE
819 dump_floats(s, "samples", 6, samples[ch] + samples_offset,
820 s->frame_len);
821 #endif /* TRACE */
822 }
823
824 586 return 0;
825 }
826
827 593 static int wma_decode_superframe(AVCodecContext *avctx, AVFrame *frame,
828 int *got_frame_ptr, AVPacket *avpkt)
829 {
830 593 const uint8_t *buf = avpkt->data;
831 593 int buf_size = avpkt->size;
832 593 WMACodecContext *s = avctx->priv_data;
833 int nb_frames, bit_offset, i, pos, len, ret;
834 uint8_t *q;
835 float **samples;
836 int samples_offset;
837
838 ff_tlog(avctx, "***decode_superframe:\n");
839
840
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593 if (buf_size == 0) {
841
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6 if (s->eof_done)
842 3 return 0;
843
844 3 frame->nb_samples = s->frame_len;
845
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3 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
846 return ret;
847
848
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9 for (i = 0; i < s->avctx->ch_layout.nb_channels; i++)
849 6 memcpy(frame->extended_data[i], &s->frame_out[i][0],
850 6 frame->nb_samples * sizeof(s->frame_out[i][0]));
851
852 3 s->last_superframe_len = 0;
853 3 s->eof_done = 1;
854 3 *got_frame_ptr = 1;
855 3 return 0;
856 }
857
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587 if (buf_size < avctx->block_align) {
858 1 av_log(avctx, AV_LOG_ERROR,
859 "Input packet size too small (%d < %d)\n",
860 buf_size, avctx->block_align);
861 1 return AVERROR_INVALIDDATA;
862 }
863
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586 if (avctx->block_align)
864 586 buf_size = avctx->block_align;
865
866 586 init_get_bits(&s->gb, buf, buf_size * 8);
867
868
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586 if (s->use_bit_reservoir) {
869 /* read super frame header */
870 skip_bits(&s->gb, 4); /* super frame index */
871 nb_frames = get_bits(&s->gb, 4) - (s->last_superframe_len <= 0);
872 if (nb_frames <= 0) {
873 int is_error = nb_frames < 0 || get_bits_left(&s->gb) <= 8;
874 av_log(avctx, is_error ? AV_LOG_ERROR : AV_LOG_WARNING,
875 "nb_frames is %d bits left %d\n",
876 nb_frames, get_bits_left(&s->gb));
877 if (is_error)
878 return AVERROR_INVALIDDATA;
879
880 if ((s->last_superframe_len + buf_size - 1) >
881 MAX_CODED_SUPERFRAME_SIZE)
882 goto fail;
883
884 q = s->last_superframe + s->last_superframe_len;
885 len = buf_size - 1;
886 while (len > 0) {
887 *q++ = get_bits (&s->gb, 8);
888 len --;
889 }
890 memset(q, 0, AV_INPUT_BUFFER_PADDING_SIZE);
891
892 s->last_superframe_len += 8*buf_size - 8;
893 // s->reset_block_lengths = 1; //XXX is this needed ?
894 *got_frame_ptr = 0;
895 return buf_size;
896 }
897 } else
898 586 nb_frames = 1;
899
900 /* get output buffer */
901 586 frame->nb_samples = nb_frames * s->frame_len;
902
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586 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
903 return ret;
904 586 samples = (float **) frame->extended_data;
905 586 samples_offset = 0;
906
907
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586 if (s->use_bit_reservoir) {
908 bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
909 if (bit_offset > get_bits_left(&s->gb)) {
910 av_log(avctx, AV_LOG_ERROR,
911 "Invalid last frame bit offset %d > buf size %d (%d)\n",
912 bit_offset, get_bits_left(&s->gb), buf_size);
913 goto fail;
914 }
915
916 if (s->last_superframe_len > 0) {
917 /* add bit_offset bits to last frame */
918 if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) >
919 MAX_CODED_SUPERFRAME_SIZE)
920 goto fail;
921 q = s->last_superframe + s->last_superframe_len;
922 len = bit_offset;
923 while (len > 7) {
924 *q++ = get_bits(&s->gb, 8);
925 len -= 8;
926 }
927 if (len > 0)
928 *q++ = get_bits(&s->gb, len) << (8 - len);
929 memset(q, 0, AV_INPUT_BUFFER_PADDING_SIZE);
930
931 /* XXX: bit_offset bits into last frame */
932 init_get_bits(&s->gb, s->last_superframe,
933 s->last_superframe_len * 8 + bit_offset);
934 /* skip unused bits */
935 if (s->last_bitoffset > 0)
936 skip_bits(&s->gb, s->last_bitoffset);
937 /* this frame is stored in the last superframe and in the
938 * current one */
939 if (wma_decode_frame(s, samples, samples_offset) < 0)
940 goto fail;
941 samples_offset += s->frame_len;
942 nb_frames--;
943 }
944
945 /* read each frame starting from bit_offset */
946 pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
947 if (pos >= MAX_CODED_SUPERFRAME_SIZE * 8 || pos > buf_size * 8)
948 return AVERROR_INVALIDDATA;
949 init_get_bits(&s->gb, buf + (pos >> 3), (buf_size - (pos >> 3)) * 8);
950 len = pos & 7;
951 if (len > 0)
952 skip_bits(&s->gb, len);
953
954 s->reset_block_lengths = 1;
955 for (i = 0; i < nb_frames; i++) {
956 if (wma_decode_frame(s, samples, samples_offset) < 0)
957 goto fail;
958 samples_offset += s->frame_len;
959 }
960
961 /* we copy the end of the frame in the last frame buffer */
962 pos = get_bits_count(&s->gb) +
963 ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7);
964 s->last_bitoffset = pos & 7;
965 pos >>= 3;
966 len = buf_size - pos;
967 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) {
968 av_log(s->avctx, AV_LOG_ERROR, "len %d invalid\n", len);
969 goto fail;
970 }
971 s->last_superframe_len = len;
972 memcpy(s->last_superframe, buf + pos, len);
973 } else {
974 /* single frame decode */
975
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586 if (wma_decode_frame(s, samples, samples_offset) < 0)
976 goto fail;
977 586 samples_offset += s->frame_len;
978 }
979
980 ff_dlog(s->avctx, "%d %d %d %d eaten:%d\n",
981 s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len,
982 avctx->block_align);
983
984 586 *got_frame_ptr = 1;
985
986 586 return buf_size;
987
988 fail:
989 /* when error, we reset the bit reservoir */
990 s->last_superframe_len = 0;
991 return -1;
992 }
993
994 1 static av_cold void flush(AVCodecContext *avctx)
995 {
996 1 WMACodecContext *s = avctx->priv_data;
997
998 1 s->last_bitoffset =
999 1 s->last_superframe_len = 0;
1000
1001 1 s->eof_done = 0;
1002 1 avctx->internal->skip_samples = s->frame_len * 2;
1003 1 }
1004
1005 #if CONFIG_WMAV1_DECODER
1006 const FFCodec ff_wmav1_decoder = {
1007 .p.name = "wmav1",
1008 CODEC_LONG_NAME("Windows Media Audio 1"),
1009 .p.type = AVMEDIA_TYPE_AUDIO,
1010 .p.id = AV_CODEC_ID_WMAV1,
1011 .priv_data_size = sizeof(WMACodecContext),
1012 .init = wma_decode_init,
1013 .close = ff_wma_end,
1014 FF_CODEC_DECODE_CB(wma_decode_superframe),
1015 .flush = flush,
1016 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
1017 .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
1018 AV_SAMPLE_FMT_NONE },
1019 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
1020 };
1021 #endif
1022 #if CONFIG_WMAV2_DECODER
1023 const FFCodec ff_wmav2_decoder = {
1024 .p.name = "wmav2",
1025 CODEC_LONG_NAME("Windows Media Audio 2"),
1026 .p.type = AVMEDIA_TYPE_AUDIO,
1027 .p.id = AV_CODEC_ID_WMAV2,
1028 .priv_data_size = sizeof(WMACodecContext),
1029 .init = wma_decode_init,
1030 .close = ff_wma_end,
1031 FF_CODEC_DECODE_CB(wma_decode_superframe),
1032 .flush = flush,
1033 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
1034 .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
1035 AV_SAMPLE_FMT_NONE },
1036 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
1037 };
1038 #endif
1039