Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / wmadec.c
CommitLineData
2ba45a60
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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
38#include "avcodec.h"
39#include "internal.h"
40#include "wma.h"
41
42#undef NDEBUG
43#include <assert.h>
44
45#define EXPVLCBITS 8
46#define EXPMAX ((19 + EXPVLCBITS - 1) / EXPVLCBITS)
47
48#define HGAINVLCBITS 9
49#define HGAINMAX ((13 + HGAINVLCBITS - 1) / HGAINVLCBITS)
50
51static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len);
52
53#ifdef TRACE
54static void dump_floats(WMACodecContext *s, const char *name,
55 int prec, const float *tab, int n)
56{
57 int i;
58
59 tprintf(s->avctx, "%s[%d]:\n", name, n);
60 for (i = 0; i < n; i++) {
61 if ((i & 7) == 0)
62 tprintf(s->avctx, "%4d: ", i);
63 tprintf(s->avctx, " %8.*f", prec, tab[i]);
64 if ((i & 7) == 7)
65 tprintf(s->avctx, "\n");
66 }
67 if ((i & 7) != 0)
68 tprintf(s->avctx, "\n");
69}
70#endif /* TRACE */
71
72static av_cold int wma_decode_init(AVCodecContext *avctx)
73{
74 WMACodecContext *s = avctx->priv_data;
75 int i, flags2;
76 uint8_t *extradata;
77
78 if (!avctx->block_align) {
79 av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
80 return AVERROR(EINVAL);
81 }
82
83 s->avctx = avctx;
84
85 /* extract flag infos */
86 flags2 = 0;
87 extradata = avctx->extradata;
88 if (avctx->codec->id == AV_CODEC_ID_WMAV1 && avctx->extradata_size >= 4)
89 flags2 = AV_RL16(extradata + 2);
90 else if (avctx->codec->id == AV_CODEC_ID_WMAV2 && avctx->extradata_size >= 6)
91 flags2 = AV_RL16(extradata + 4);
92
93 s->use_exp_vlc = flags2 & 0x0001;
94 s->use_bit_reservoir = flags2 & 0x0002;
95 s->use_variable_block_len = flags2 & 0x0004;
96
97 if (avctx->codec->id == AV_CODEC_ID_WMAV2 && avctx->extradata_size >= 8){
98 if (AV_RL16(extradata+4)==0xd && s->use_variable_block_len){
99 av_log(avctx, AV_LOG_WARNING, "Disabling use_variable_block_len, if this fails contact the ffmpeg developers and send us the file\n");
100 s->use_variable_block_len= 0; // this fixes issue1503
101 }
102 }
103
104 for (i=0; i<MAX_CHANNELS; i++)
105 s->max_exponent[i] = 1.0;
106
107 if (ff_wma_init(avctx, flags2) < 0)
108 return -1;
109
110 /* init MDCT */
111 for (i = 0; i < s->nb_block_sizes; i++)
112 ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 1, 1.0 / 32768.0);
113
114 if (s->use_noise_coding) {
115 init_vlc(&s->hgain_vlc, HGAINVLCBITS, sizeof(ff_wma_hgain_huffbits),
116 ff_wma_hgain_huffbits, 1, 1,
117 ff_wma_hgain_huffcodes, 2, 2, 0);
118 }
119
120 if (s->use_exp_vlc)
121 init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(ff_aac_scalefactor_bits), // FIXME move out of context
122 ff_aac_scalefactor_bits, 1, 1,
123 ff_aac_scalefactor_code, 4, 4, 0);
124 else
125 wma_lsp_to_curve_init(s, s->frame_len);
126
127 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
128
129 return 0;
130}
131
132/**
133 * compute x^-0.25 with an exponent and mantissa table. We use linear
134 * interpolation to reduce the mantissa table size at a small speed
135 * expense (linear interpolation approximately doubles the number of
136 * bits of precision).
137 */
138static inline float pow_m1_4(WMACodecContext *s, float x)
139{
140 union {
141 float f;
142 unsigned int v;
143 } u, t;
144 unsigned int e, m;
145 float a, b;
146
147 u.f = x;
148 e = u.v >> 23;
149 m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
150 /* build interpolation scale: 1 <= t < 2. */
151 t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
152 a = s->lsp_pow_m_table1[m];
153 b = s->lsp_pow_m_table2[m];
154 return s->lsp_pow_e_table[e] * (a + b * t.f);
155}
156
157static av_cold void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len)
158{
159 float wdel, a, b;
160 int i, e, m;
161
162 wdel = M_PI / frame_len;
163 for (i = 0; i < frame_len; i++)
164 s->lsp_cos_table[i] = 2.0f * cos(wdel * i);
165
166 /* tables for x^-0.25 computation */
167 for (i = 0; i < 256; i++) {
168 e = i - 126;
169 s->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
170 }
171
172 /* NOTE: these two tables are needed to avoid two operations in
173 * pow_m1_4 */
174 b = 1.0;
175 for (i = (1 << LSP_POW_BITS) - 1; i >= 0; i--) {
176 m = (1 << LSP_POW_BITS) + i;
177 a = (float) m * (0.5 / (1 << LSP_POW_BITS));
178 a = pow(a, -0.25);
179 s->lsp_pow_m_table1[i] = 2 * a - b;
180 s->lsp_pow_m_table2[i] = b - a;
181 b = a;
182 }
183}
184
185/**
186 * NOTE: We use the same code as Vorbis here
187 * @todo optimize it further with SSE/3Dnow
188 */
189static void wma_lsp_to_curve(WMACodecContext *s, float *out, float *val_max_ptr,
190 int n, float *lsp)
191{
192 int i, j;
193 float p, q, w, v, val_max;
194
195 val_max = 0;
196 for (i = 0; i < n; i++) {
197 p = 0.5f;
198 q = 0.5f;
199 w = s->lsp_cos_table[i];
200 for (j = 1; j < NB_LSP_COEFS; j += 2) {
201 q *= w - lsp[j - 1];
202 p *= w - lsp[j];
203 }
204 p *= p * (2.0f - w);
205 q *= q * (2.0f + w);
206 v = p + q;
207 v = pow_m1_4(s, v);
208 if (v > val_max)
209 val_max = v;
210 out[i] = v;
211 }
212 *val_max_ptr = val_max;
213}
214
215/**
216 * decode exponents coded with LSP coefficients (same idea as Vorbis)
217 */
218static void decode_exp_lsp(WMACodecContext *s, int ch)
219{
220 float lsp_coefs[NB_LSP_COEFS];
221 int val, i;
222
223 for (i = 0; i < NB_LSP_COEFS; i++) {
224 if (i == 0 || i >= 8)
225 val = get_bits(&s->gb, 3);
226 else
227 val = get_bits(&s->gb, 4);
228 lsp_coefs[i] = ff_wma_lsp_codebook[i][val];
229 }
230
231 wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch],
232 s->block_len, lsp_coefs);
233}
234
235/** pow(10, i / 16.0) for i in -60..95 */
236static const float pow_tab[] = {
237 1.7782794100389e-04, 2.0535250264571e-04,
238 2.3713737056617e-04, 2.7384196342644e-04,
239 3.1622776601684e-04, 3.6517412725484e-04,
240 4.2169650342858e-04, 4.8696752516586e-04,
241 5.6234132519035e-04, 6.4938163157621e-04,
242 7.4989420933246e-04, 8.6596432336006e-04,
243 1.0000000000000e-03, 1.1547819846895e-03,
244 1.3335214321633e-03, 1.5399265260595e-03,
245 1.7782794100389e-03, 2.0535250264571e-03,
246 2.3713737056617e-03, 2.7384196342644e-03,
247 3.1622776601684e-03, 3.6517412725484e-03,
248 4.2169650342858e-03, 4.8696752516586e-03,
249 5.6234132519035e-03, 6.4938163157621e-03,
250 7.4989420933246e-03, 8.6596432336006e-03,
251 1.0000000000000e-02, 1.1547819846895e-02,
252 1.3335214321633e-02, 1.5399265260595e-02,
253 1.7782794100389e-02, 2.0535250264571e-02,
254 2.3713737056617e-02, 2.7384196342644e-02,
255 3.1622776601684e-02, 3.6517412725484e-02,
256 4.2169650342858e-02, 4.8696752516586e-02,
257 5.6234132519035e-02, 6.4938163157621e-02,
258 7.4989420933246e-02, 8.6596432336007e-02,
259 1.0000000000000e-01, 1.1547819846895e-01,
260 1.3335214321633e-01, 1.5399265260595e-01,
261 1.7782794100389e-01, 2.0535250264571e-01,
262 2.3713737056617e-01, 2.7384196342644e-01,
263 3.1622776601684e-01, 3.6517412725484e-01,
264 4.2169650342858e-01, 4.8696752516586e-01,
265 5.6234132519035e-01, 6.4938163157621e-01,
266 7.4989420933246e-01, 8.6596432336007e-01,
267 1.0000000000000e+00, 1.1547819846895e+00,
268 1.3335214321633e+00, 1.5399265260595e+00,
269 1.7782794100389e+00, 2.0535250264571e+00,
270 2.3713737056617e+00, 2.7384196342644e+00,
271 3.1622776601684e+00, 3.6517412725484e+00,
272 4.2169650342858e+00, 4.8696752516586e+00,
273 5.6234132519035e+00, 6.4938163157621e+00,
274 7.4989420933246e+00, 8.6596432336007e+00,
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+02, 1.1547819846895e+02,
284 1.3335214321633e+02, 1.5399265260595e+02,
285 1.7782794100389e+02, 2.0535250264571e+02,
286 2.3713737056617e+02, 2.7384196342644e+02,
287 3.1622776601684e+02, 3.6517412725484e+02,
288 4.2169650342858e+02, 4.8696752516586e+02,
289 5.6234132519035e+02, 6.4938163157621e+02,
290 7.4989420933246e+02, 8.6596432336007e+02,
291 1.0000000000000e+03, 1.1547819846895e+03,
292 1.3335214321633e+03, 1.5399265260595e+03,
293 1.7782794100389e+03, 2.0535250264571e+03,
294 2.3713737056617e+03, 2.7384196342644e+03,
295 3.1622776601684e+03, 3.6517412725484e+03,
296 4.2169650342858e+03, 4.8696752516586e+03,
297 5.6234132519035e+03, 6.4938163157621e+03,
298 7.4989420933246e+03, 8.6596432336007e+03,
299 1.0000000000000e+04, 1.1547819846895e+04,
300 1.3335214321633e+04, 1.5399265260595e+04,
301 1.7782794100389e+04, 2.0535250264571e+04,
302 2.3713737056617e+04, 2.7384196342644e+04,
303 3.1622776601684e+04, 3.6517412725484e+04,
304 4.2169650342858e+04, 4.8696752516586e+04,
305 5.6234132519035e+04, 6.4938163157621e+04,
306 7.4989420933246e+04, 8.6596432336007e+04,
307 1.0000000000000e+05, 1.1547819846895e+05,
308 1.3335214321633e+05, 1.5399265260595e+05,
309 1.7782794100389e+05, 2.0535250264571e+05,
310 2.3713737056617e+05, 2.7384196342644e+05,
311 3.1622776601684e+05, 3.6517412725484e+05,
312 4.2169650342858e+05, 4.8696752516586e+05,
313 5.6234132519035e+05, 6.4938163157621e+05,
314 7.4989420933246e+05, 8.6596432336007e+05,
315};
316
317/**
318 * decode exponents coded with VLC codes
319 */
320static int decode_exp_vlc(WMACodecContext *s, int ch)
321{
322 int last_exp, n, code;
323 const uint16_t *ptr;
324 float v, max_scale;
325 uint32_t *q, *q_end, iv;
326 const float *ptab = pow_tab + 60;
327 const uint32_t *iptab = (const uint32_t *) ptab;
328
329 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
330 q = (uint32_t *) s->exponents[ch];
331 q_end = q + s->block_len;
332 max_scale = 0;
333 if (s->version == 1) {
334 last_exp = get_bits(&s->gb, 5) + 10;
335 v = ptab[last_exp];
336 iv = iptab[last_exp];
337 max_scale = v;
338 n = *ptr++;
339 switch (n & 3) do {
340 case 0: *q++ = iv;
341 case 3: *q++ = iv;
342 case 2: *q++ = iv;
343 case 1: *q++ = iv;
344 } while ((n -= 4) > 0);
345 } else
346 last_exp = 36;
347
348 while (q < q_end) {
349 code = get_vlc2(&s->gb, s->exp_vlc.table, EXPVLCBITS, EXPMAX);
350 if (code < 0) {
351 av_log(s->avctx, AV_LOG_ERROR, "Exponent vlc invalid\n");
352 return -1;
353 }
354 /* NOTE: this offset is the same as MPEG4 AAC ! */
355 last_exp += code - 60;
356 if ((unsigned) last_exp + 60 >= FF_ARRAY_ELEMS(pow_tab)) {
357 av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n",
358 last_exp);
359 return -1;
360 }
361 v = ptab[last_exp];
362 iv = iptab[last_exp];
363 if (v > max_scale)
364 max_scale = v;
365 n = *ptr++;
366 switch (n & 3) do {
367 case 0: *q++ = iv;
368 case 3: *q++ = iv;
369 case 2: *q++ = iv;
370 case 1: *q++ = iv;
371 } while ((n -= 4) > 0);
372 }
373 s->max_exponent[ch] = max_scale;
374 return 0;
375}
376
377/**
378 * Apply MDCT window and add into output.
379 *
380 * We ensure that when the windows overlap their squared sum
381 * is always 1 (MDCT reconstruction rule).
382 */
383static void wma_window(WMACodecContext *s, float *out)
384{
385 float *in = s->output;
386 int block_len, bsize, n;
387
388 /* left part */
389 if (s->block_len_bits <= s->prev_block_len_bits) {
390 block_len = s->block_len;
391 bsize = s->frame_len_bits - s->block_len_bits;
392
f6fa7814 393 s->fdsp->vector_fmul_add(out, in, s->windows[bsize],
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394 out, block_len);
395 } else {
396 block_len = 1 << s->prev_block_len_bits;
397 n = (s->block_len - block_len) / 2;
398 bsize = s->frame_len_bits - s->prev_block_len_bits;
399
f6fa7814 400 s->fdsp->vector_fmul_add(out + n, in + n, s->windows[bsize],
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401 out + n, block_len);
402
403 memcpy(out + n + block_len, in + n + block_len, n * sizeof(float));
404 }
405
406 out += s->block_len;
407 in += s->block_len;
408
409 /* right part */
410 if (s->block_len_bits <= s->next_block_len_bits) {
411 block_len = s->block_len;
412 bsize = s->frame_len_bits - s->block_len_bits;
413
f6fa7814 414 s->fdsp->vector_fmul_reverse(out, in, s->windows[bsize], block_len);
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415 } else {
416 block_len = 1 << s->next_block_len_bits;
417 n = (s->block_len - block_len) / 2;
418 bsize = s->frame_len_bits - s->next_block_len_bits;
419
420 memcpy(out, in, n * sizeof(float));
421
f6fa7814 422 s->fdsp->vector_fmul_reverse(out + n, in + n, s->windows[bsize],
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423 block_len);
424
425 memset(out + n + block_len, 0, n * sizeof(float));
426 }
427}
428
429/**
430 * @return 0 if OK. 1 if last block of frame. return -1 if
431 * unrecorrable error.
432 */
433static int wma_decode_block(WMACodecContext *s)
434{
435 int n, v, a, ch, bsize;
436 int coef_nb_bits, total_gain;
437 int nb_coefs[MAX_CHANNELS];
438 float mdct_norm;
439 FFTContext *mdct;
440
441#ifdef TRACE
442 tprintf(s->avctx, "***decode_block: %d:%d\n",
443 s->frame_count - 1, s->block_num);
444#endif /* TRACE */
445
446 /* compute current block length */
447 if (s->use_variable_block_len) {
448 n = av_log2(s->nb_block_sizes - 1) + 1;
449
450 if (s->reset_block_lengths) {
451 s->reset_block_lengths = 0;
452 v = get_bits(&s->gb, n);
453 if (v >= s->nb_block_sizes) {
454 av_log(s->avctx, AV_LOG_ERROR,
455 "prev_block_len_bits %d out of range\n",
456 s->frame_len_bits - v);
457 return -1;
458 }
459 s->prev_block_len_bits = s->frame_len_bits - v;
460 v = get_bits(&s->gb, n);
461 if (v >= s->nb_block_sizes) {
462 av_log(s->avctx, AV_LOG_ERROR,
463 "block_len_bits %d out of range\n",
464 s->frame_len_bits - v);
465 return -1;
466 }
467 s->block_len_bits = s->frame_len_bits - v;
468 } else {
469 /* update block lengths */
470 s->prev_block_len_bits = s->block_len_bits;
471 s->block_len_bits = s->next_block_len_bits;
472 }
473 v = get_bits(&s->gb, n);
474 if (v >= s->nb_block_sizes) {
475 av_log(s->avctx, AV_LOG_ERROR,
476 "next_block_len_bits %d out of range\n",
477 s->frame_len_bits - v);
478 return -1;
479 }
480 s->next_block_len_bits = s->frame_len_bits - v;
481 } else {
482 /* fixed block len */
483 s->next_block_len_bits = s->frame_len_bits;
484 s->prev_block_len_bits = s->frame_len_bits;
485 s->block_len_bits = s->frame_len_bits;
486 }
487
488 if (s->frame_len_bits - s->block_len_bits >= s->nb_block_sizes){
489 av_log(s->avctx, AV_LOG_ERROR, "block_len_bits not initialized to a valid value\n");
490 return -1;
491 }
492
493 /* now check if the block length is coherent with the frame length */
494 s->block_len = 1 << s->block_len_bits;
495 if ((s->block_pos + s->block_len) > s->frame_len) {
496 av_log(s->avctx, AV_LOG_ERROR, "frame_len overflow\n");
497 return -1;
498 }
499
500 if (s->avctx->channels == 2)
501 s->ms_stereo = get_bits1(&s->gb);
502 v = 0;
503 for (ch = 0; ch < s->avctx->channels; ch++) {
504 a = get_bits1(&s->gb);
505 s->channel_coded[ch] = a;
506 v |= a;
507 }
508
509 bsize = s->frame_len_bits - s->block_len_bits;
510
511 /* if no channel coded, no need to go further */
512 /* XXX: fix potential framing problems */
513 if (!v)
514 goto next;
515
516 /* read total gain and extract corresponding number of bits for
517 * coef escape coding */
518 total_gain = 1;
519 for (;;) {
520 if (get_bits_left(&s->gb) < 7) {
521 av_log(s->avctx, AV_LOG_ERROR, "total_gain overread\n");
522 return AVERROR_INVALIDDATA;
523 }
524 a = get_bits(&s->gb, 7);
525 total_gain += a;
526 if (a != 127)
527 break;
528 }
529
530 coef_nb_bits = ff_wma_total_gain_to_bits(total_gain);
531
532 /* compute number of coefficients */
533 n = s->coefs_end[bsize] - s->coefs_start;
534 for (ch = 0; ch < s->avctx->channels; ch++)
535 nb_coefs[ch] = n;
536
537 /* complex coding */
538 if (s->use_noise_coding) {
539 for (ch = 0; ch < s->avctx->channels; ch++) {
540 if (s->channel_coded[ch]) {
541 int i, n, a;
542 n = s->exponent_high_sizes[bsize];
543 for (i = 0; i < n; i++) {
544 a = get_bits1(&s->gb);
545 s->high_band_coded[ch][i] = a;
546 /* if noise coding, the coefficients are not transmitted */
547 if (a)
548 nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
549 }
550 }
551 }
552 for (ch = 0; ch < s->avctx->channels; ch++) {
553 if (s->channel_coded[ch]) {
554 int i, n, val, code;
555
556 n = s->exponent_high_sizes[bsize];
557 val = (int) 0x80000000;
558 for (i = 0; i < n; i++) {
559 if (s->high_band_coded[ch][i]) {
560 if (val == (int) 0x80000000) {
561 val = get_bits(&s->gb, 7) - 19;
562 } else {
563 code = get_vlc2(&s->gb, s->hgain_vlc.table,
564 HGAINVLCBITS, HGAINMAX);
565 if (code < 0) {
566 av_log(s->avctx, AV_LOG_ERROR,
567 "hgain vlc invalid\n");
568 return -1;
569 }
570 val += code - 18;
571 }
572 s->high_band_values[ch][i] = val;
573 }
574 }
575 }
576 }
577 }
578
579 /* exponents can be reused in short blocks. */
580 if ((s->block_len_bits == s->frame_len_bits) || get_bits1(&s->gb)) {
581 for (ch = 0; ch < s->avctx->channels; ch++) {
582 if (s->channel_coded[ch]) {
583 if (s->use_exp_vlc) {
584 if (decode_exp_vlc(s, ch) < 0)
585 return -1;
586 } else {
587 decode_exp_lsp(s, ch);
588 }
589 s->exponents_bsize[ch] = bsize;
590 }
591 }
592 }
593
594 /* parse spectral coefficients : just RLE encoding */
595 for (ch = 0; ch < s->avctx->channels; ch++) {
596 if (s->channel_coded[ch]) {
597 int tindex;
598 WMACoef *ptr = &s->coefs1[ch][0];
599
600 /* special VLC tables are used for ms stereo because
601 * there is potentially less energy there */
602 tindex = (ch == 1 && s->ms_stereo);
603 memset(ptr, 0, s->block_len * sizeof(WMACoef));
604 ff_wma_run_level_decode(s->avctx, &s->gb, &s->coef_vlc[tindex],
605 s->level_table[tindex], s->run_table[tindex],
606 0, ptr, 0, nb_coefs[ch],
607 s->block_len, s->frame_len_bits, coef_nb_bits);
608 }
609 if (s->version == 1 && s->avctx->channels >= 2)
610 align_get_bits(&s->gb);
611 }
612
613 /* normalize */
614 {
615 int n4 = s->block_len / 2;
616 mdct_norm = 1.0 / (float) n4;
617 if (s->version == 1)
618 mdct_norm *= sqrt(n4);
619 }
620
621 /* finally compute the MDCT coefficients */
622 for (ch = 0; ch < s->avctx->channels; ch++) {
623 if (s->channel_coded[ch]) {
624 WMACoef *coefs1;
625 float *coefs, *exponents, mult, mult1, noise;
626 int i, j, n, n1, last_high_band, esize;
627 float exp_power[HIGH_BAND_MAX_SIZE];
628
629 coefs1 = s->coefs1[ch];
630 exponents = s->exponents[ch];
631 esize = s->exponents_bsize[ch];
632 mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
633 mult *= mdct_norm;
634 coefs = s->coefs[ch];
635 if (s->use_noise_coding) {
636 mult1 = mult;
637 /* very low freqs : noise */
638 for (i = 0; i < s->coefs_start; i++) {
639 *coefs++ = s->noise_table[s->noise_index] *
640 exponents[i << bsize >> esize] * mult1;
641 s->noise_index = (s->noise_index + 1) &
642 (NOISE_TAB_SIZE - 1);
643 }
644
645 n1 = s->exponent_high_sizes[bsize];
646
647 /* compute power of high bands */
648 exponents = s->exponents[ch] +
649 (s->high_band_start[bsize] << bsize >> esize);
650 last_high_band = 0; /* avoid warning */
651 for (j = 0; j < n1; j++) {
652 n = s->exponent_high_bands[s->frame_len_bits -
653 s->block_len_bits][j];
654 if (s->high_band_coded[ch][j]) {
655 float e2, v;
656 e2 = 0;
657 for (i = 0; i < n; i++) {
658 v = exponents[i << bsize >> esize];
659 e2 += v * v;
660 }
661 exp_power[j] = e2 / n;
662 last_high_band = j;
663 tprintf(s->avctx, "%d: power=%f (%d)\n", j, exp_power[j], n);
664 }
665 exponents += n << bsize >> esize;
666 }
667
668 /* main freqs and high freqs */
669 exponents = s->exponents[ch] + (s->coefs_start << bsize >> esize);
670 for (j = -1; j < n1; j++) {
671 if (j < 0)
672 n = s->high_band_start[bsize] - s->coefs_start;
673 else
674 n = s->exponent_high_bands[s->frame_len_bits -
675 s->block_len_bits][j];
676 if (j >= 0 && s->high_band_coded[ch][j]) {
677 /* use noise with specified power */
678 mult1 = sqrt(exp_power[j] / exp_power[last_high_band]);
679 /* XXX: use a table */
680 mult1 = mult1 * pow(10, s->high_band_values[ch][j] * 0.05);
681 mult1 = mult1 / (s->max_exponent[ch] * s->noise_mult);
682 mult1 *= mdct_norm;
683 for (i = 0; i < n; i++) {
684 noise = s->noise_table[s->noise_index];
685 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
686 *coefs++ = noise * exponents[i << bsize >> esize] * mult1;
687 }
688 exponents += n << bsize >> esize;
689 } else {
690 /* coded values + small noise */
691 for (i = 0; i < n; i++) {
692 noise = s->noise_table[s->noise_index];
693 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
694 *coefs++ = ((*coefs1++) + noise) *
695 exponents[i << bsize >> esize] * mult;
696 }
697 exponents += n << bsize >> esize;
698 }
699 }
700
701 /* very high freqs : noise */
702 n = s->block_len - s->coefs_end[bsize];
703 mult1 = mult * exponents[((-1 << bsize)) >> esize];
704 for (i = 0; i < n; i++) {
705 *coefs++ = s->noise_table[s->noise_index] * mult1;
706 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
707 }
708 } else {
709 /* XXX: optimize more */
710 for (i = 0; i < s->coefs_start; i++)
711 *coefs++ = 0.0;
712 n = nb_coefs[ch];
713 for (i = 0; i < n; i++)
714 *coefs++ = coefs1[i] * exponents[i << bsize >> esize] * mult;
715 n = s->block_len - s->coefs_end[bsize];
716 for (i = 0; i < n; i++)
717 *coefs++ = 0.0;
718 }
719 }
720 }
721
722#ifdef TRACE
723 for (ch = 0; ch < s->avctx->channels; ch++) {
724 if (s->channel_coded[ch]) {
725 dump_floats(s, "exponents", 3, s->exponents[ch], s->block_len);
726 dump_floats(s, "coefs", 1, s->coefs[ch], s->block_len);
727 }
728 }
729#endif /* TRACE */
730
731 if (s->ms_stereo && s->channel_coded[1]) {
732 /* nominal case for ms stereo: we do it before mdct */
733 /* no need to optimize this case because it should almost
734 * never happen */
735 if (!s->channel_coded[0]) {
736 tprintf(s->avctx, "rare ms-stereo case happened\n");
737 memset(s->coefs[0], 0, sizeof(float) * s->block_len);
738 s->channel_coded[0] = 1;
739 }
740
f6fa7814 741 s->fdsp->butterflies_float(s->coefs[0], s->coefs[1], s->block_len);
2ba45a60
DM
742 }
743
744next:
745 mdct = &s->mdct_ctx[bsize];
746
747 for (ch = 0; ch < s->avctx->channels; ch++) {
748 int n4, index;
749
750 n4 = s->block_len / 2;
751 if (s->channel_coded[ch])
752 mdct->imdct_calc(mdct, s->output, s->coefs[ch]);
753 else if (!(s->ms_stereo && ch == 1))
754 memset(s->output, 0, sizeof(s->output));
755
756 /* multiply by the window and add in the frame */
757 index = (s->frame_len / 2) + s->block_pos - n4;
758 wma_window(s, &s->frame_out[ch][index]);
759 }
760
761 /* update block number */
762 s->block_num++;
763 s->block_pos += s->block_len;
764 if (s->block_pos >= s->frame_len)
765 return 1;
766 else
767 return 0;
768}
769
770/* decode a frame of frame_len samples */
771static int wma_decode_frame(WMACodecContext *s, float **samples,
772 int samples_offset)
773{
774 int ret, ch;
775
776#ifdef TRACE
777 tprintf(s->avctx, "***decode_frame: %d size=%d\n",
778 s->frame_count++, s->frame_len);
779#endif /* TRACE */
780
781 /* read each block */
782 s->block_num = 0;
783 s->block_pos = 0;
784 for (;;) {
785 ret = wma_decode_block(s);
786 if (ret < 0)
787 return -1;
788 if (ret)
789 break;
790 }
791
792 for (ch = 0; ch < s->avctx->channels; ch++) {
793 /* copy current block to output */
794 memcpy(samples[ch] + samples_offset, s->frame_out[ch],
795 s->frame_len * sizeof(*s->frame_out[ch]));
796 /* prepare for next block */
797 memmove(&s->frame_out[ch][0], &s->frame_out[ch][s->frame_len],
798 s->frame_len * sizeof(*s->frame_out[ch]));
799
800#ifdef TRACE
801 dump_floats(s, "samples", 6, samples[ch] + samples_offset,
802 s->frame_len);
803#endif /* TRACE */
804 }
805
806 return 0;
807}
808
809static int wma_decode_superframe(AVCodecContext *avctx, void *data,
810 int *got_frame_ptr, AVPacket *avpkt)
811{
812 AVFrame *frame = data;
813 const uint8_t *buf = avpkt->data;
814 int buf_size = avpkt->size;
815 WMACodecContext *s = avctx->priv_data;
816 int nb_frames, bit_offset, i, pos, len, ret;
817 uint8_t *q;
818 float **samples;
819 int samples_offset;
820
821 tprintf(avctx, "***decode_superframe:\n");
822
823 if (buf_size == 0) {
824 s->last_superframe_len = 0;
825 return 0;
826 }
827 if (buf_size < avctx->block_align) {
828 av_log(avctx, AV_LOG_ERROR,
829 "Input packet size too small (%d < %d)\n",
830 buf_size, avctx->block_align);
831 return AVERROR_INVALIDDATA;
832 }
833 if (avctx->block_align)
834 buf_size = avctx->block_align;
835
836 init_get_bits(&s->gb, buf, buf_size * 8);
837
838 if (s->use_bit_reservoir) {
839 /* read super frame header */
840 skip_bits(&s->gb, 4); /* super frame index */
841 nb_frames = get_bits(&s->gb, 4) - (s->last_superframe_len <= 0);
842 if (nb_frames <= 0) {
843 av_log(avctx, AV_LOG_ERROR, "nb_frames is %d\n", nb_frames);
844 return AVERROR_INVALIDDATA;
845 }
846 } else
847 nb_frames = 1;
848
849 /* get output buffer */
850 frame->nb_samples = nb_frames * s->frame_len;
851 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
852 return ret;
853 samples = (float **) frame->extended_data;
854 samples_offset = 0;
855
856 if (s->use_bit_reservoir) {
857 bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
858 if (bit_offset > get_bits_left(&s->gb)) {
859 av_log(avctx, AV_LOG_ERROR,
860 "Invalid last frame bit offset %d > buf size %d (%d)\n",
861 bit_offset, get_bits_left(&s->gb), buf_size);
862 goto fail;
863 }
864
865 if (s->last_superframe_len > 0) {
866 /* add bit_offset bits to last frame */
867 if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) >
868 MAX_CODED_SUPERFRAME_SIZE)
869 goto fail;
870 q = s->last_superframe + s->last_superframe_len;
871 len = bit_offset;
872 while (len > 7) {
873 *q++ = (get_bits) (&s->gb, 8);
874 len -= 8;
875 }
876 if (len > 0)
877 *q++ = (get_bits) (&s->gb, len) << (8 - len);
878 memset(q, 0, FF_INPUT_BUFFER_PADDING_SIZE);
879
880 /* XXX: bit_offset bits into last frame */
881 init_get_bits(&s->gb, s->last_superframe,
882 s->last_superframe_len * 8 + bit_offset);
883 /* skip unused bits */
884 if (s->last_bitoffset > 0)
885 skip_bits(&s->gb, s->last_bitoffset);
886 /* this frame is stored in the last superframe and in the
887 * current one */
888 if (wma_decode_frame(s, samples, samples_offset) < 0)
889 goto fail;
890 samples_offset += s->frame_len;
891 nb_frames--;
892 }
893
894 /* read each frame starting from bit_offset */
895 pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
896 if (pos >= MAX_CODED_SUPERFRAME_SIZE * 8 || pos > buf_size * 8)
897 return AVERROR_INVALIDDATA;
898 init_get_bits(&s->gb, buf + (pos >> 3), (buf_size - (pos >> 3)) * 8);
899 len = pos & 7;
900 if (len > 0)
901 skip_bits(&s->gb, len);
902
903 s->reset_block_lengths = 1;
904 for (i = 0; i < nb_frames; i++) {
905 if (wma_decode_frame(s, samples, samples_offset) < 0)
906 goto fail;
907 samples_offset += s->frame_len;
908 }
909
910 /* we copy the end of the frame in the last frame buffer */
911 pos = get_bits_count(&s->gb) +
912 ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7);
913 s->last_bitoffset = pos & 7;
914 pos >>= 3;
915 len = buf_size - pos;
916 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) {
917 av_log(s->avctx, AV_LOG_ERROR, "len %d invalid\n", len);
918 goto fail;
919 }
920 s->last_superframe_len = len;
921 memcpy(s->last_superframe, buf + pos, len);
922 } else {
923 /* single frame decode */
924 if (wma_decode_frame(s, samples, samples_offset) < 0)
925 goto fail;
926 samples_offset += s->frame_len;
927 }
928
929 av_dlog(s->avctx, "%d %d %d %d outbytes:%"PTRDIFF_SPECIFIER" eaten:%d\n",
930 s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len,
931 (int8_t *) samples - (int8_t *) data, avctx->block_align);
932
933 *got_frame_ptr = 1;
934
935 return buf_size;
936
937fail:
938 /* when error, we reset the bit reservoir */
939 s->last_superframe_len = 0;
940 return -1;
941}
942
943static av_cold void flush(AVCodecContext *avctx)
944{
945 WMACodecContext *s = avctx->priv_data;
946
947 s->last_bitoffset =
948 s->last_superframe_len = 0;
949}
950
951#if CONFIG_WMAV1_DECODER
952AVCodec ff_wmav1_decoder = {
953 .name = "wmav1",
954 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
955 .type = AVMEDIA_TYPE_AUDIO,
956 .id = AV_CODEC_ID_WMAV1,
957 .priv_data_size = sizeof(WMACodecContext),
958 .init = wma_decode_init,
959 .close = ff_wma_end,
960 .decode = wma_decode_superframe,
961 .flush = flush,
962 .capabilities = CODEC_CAP_DR1,
963 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
964 AV_SAMPLE_FMT_NONE },
965};
966#endif
967#if CONFIG_WMAV2_DECODER
968AVCodec ff_wmav2_decoder = {
969 .name = "wmav2",
970 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
971 .type = AVMEDIA_TYPE_AUDIO,
972 .id = AV_CODEC_ID_WMAV2,
973 .priv_data_size = sizeof(WMACodecContext),
974 .init = wma_decode_init,
975 .close = ff_wma_end,
976 .decode = wma_decode_superframe,
977 .flush = flush,
978 .capabilities = CODEC_CAP_DR1,
979 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
980 AV_SAMPLE_FMT_NONE },
981};
982#endif