FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/wma.c
Date: 2021-09-26 18:22:30
Exec Total Coverage
Lines: 221 260 85.0%
Branches: 126 168 75.0%

Line Branch Exec Source
1 /*
2 * WMA compatible codec
3 * Copyright (c) 2002-2007 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 #include "libavutil/attributes.h"
23
24 #include "avcodec.h"
25 #include "internal.h"
26 #include "sinewin.h"
27 #include "wma.h"
28 #include "wma_common.h"
29 #include "wma_freqs.h"
30 #include "wmadata.h"
31
32 /* XXX: use same run/length optimization as mpeg decoders */
33 // FIXME maybe split decode / encode or pass flag
34 32 static av_cold int init_coef_vlc(VLC *vlc, uint16_t **prun_table,
35 float **plevel_table, uint16_t **pint_table,
36 const CoefVLCTable *vlc_table)
37 {
38 32 int n = vlc_table->n;
39 32 const uint8_t *table_bits = vlc_table->huffbits;
40 32 const uint32_t *table_codes = vlc_table->huffcodes;
41 32 const uint16_t *levels_table = vlc_table->levels;
42 uint16_t *run_table, *int_table;
43 float *flevel_table;
44 int i, l, j, k, level, ret;
45
46 32 ret = init_vlc(vlc, VLCBITS, n, table_bits, 1, 1, table_codes, 4, 4, 0);
47
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32 if (ret < 0)
48 return ret;
49
50 32 run_table = av_malloc_array(n, sizeof(uint16_t));
51 32 flevel_table = av_malloc_array(n, sizeof(*flevel_table));
52 32 int_table = av_malloc_array(n, sizeof(uint16_t));
53
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32 if (!run_table || !flevel_table || !int_table) {
54 av_freep(&run_table);
55 av_freep(&flevel_table);
56 av_freep(&int_table);
57 return AVERROR(ENOMEM);
58 }
59 32 i = 2;
60 32 level = 1;
61 32 k = 0;
62
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2612 while (i < n) {
63 2580 int_table[k] = i;
64 2580 l = levels_table[k++];
65
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20086 for (j = 0; j < l; j++) {
66 17506 run_table[i] = j;
67 17506 flevel_table[i] = level;
68 17506 i++;
69 }
70 2580 level++;
71 }
72 32 *prun_table = run_table;
73 32 *plevel_table = flevel_table;
74 32 *pint_table = int_table;
75
76 32 return 0;
77 }
78
79 16 av_cold int ff_wma_init(AVCodecContext *avctx, int flags2)
80 {
81 16 WMACodecContext *s = avctx->priv_data;
82 int i, ret;
83 float bps1, high_freq;
84 float bps;
85 int sample_rate1;
86 int coef_vlc_table;
87
88
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16 if (avctx->sample_rate <= 0 || avctx->sample_rate > 50000 ||
89
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16 avctx->channels <= 0 || avctx->channels > 2 ||
90
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16 avctx->bit_rate <= 0)
91 return -1;
92
93
94
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16 if (avctx->codec->id == AV_CODEC_ID_WMAV1)
95 3 s->version = 1;
96 else
97 13 s->version = 2;
98
99 /* compute MDCT block size */
100 16 s->frame_len_bits = ff_wma_get_frame_len_bits(avctx->sample_rate,
101 s->version, 0);
102 16 s->next_block_len_bits = s->frame_len_bits;
103 16 s->prev_block_len_bits = s->frame_len_bits;
104 16 s->block_len_bits = s->frame_len_bits;
105
106 16 s->frame_len = 1 << s->frame_len_bits;
107
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16 if (s->use_variable_block_len) {
108 int nb_max, nb;
109 7 nb = ((flags2 >> 3) & 3) + 1;
110
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7 if ((avctx->bit_rate / avctx->channels) >= 32000)
111 4 nb += 2;
112 7 nb_max = s->frame_len_bits - BLOCK_MIN_BITS;
113
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7 if (nb > nb_max)
114 nb = nb_max;
115 7 s->nb_block_sizes = nb + 1;
116 } else
117 9 s->nb_block_sizes = 1;
118
119 /* init rate dependent parameters */
120 16 s->use_noise_coding = 1;
121 16 high_freq = avctx->sample_rate * 0.5;
122
123 /* if version 2, then the rates are normalized */
124 16 sample_rate1 = avctx->sample_rate;
125
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16 if (s->version == 2) {
126
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13 if (sample_rate1 >= 44100)
127 10 sample_rate1 = 44100;
128
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3 else if (sample_rate1 >= 22050)
129 sample_rate1 = 22050;
130
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3 else if (sample_rate1 >= 16000)
131 1 sample_rate1 = 16000;
132
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2 else if (sample_rate1 >= 11025)
133 sample_rate1 = 11025;
134
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2 else if (sample_rate1 >= 8000)
135 2 sample_rate1 = 8000;
136 }
137
138 16 bps = (float) avctx->bit_rate /
139 16 (float) (avctx->channels * avctx->sample_rate);
140 16 s->byte_offset_bits = av_log2((int) (bps * s->frame_len / 8.0 + 0.5)) + 2;
141
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16 if (s->byte_offset_bits + 3 > MIN_CACHE_BITS) {
142 av_log(avctx, AV_LOG_ERROR, "byte_offset_bits %d is too large\n", s->byte_offset_bits);
143 return AVERROR_PATCHWELCOME;
144 }
145
146 /* compute high frequency value and choose if noise coding should
147 * be activated */
148 16 bps1 = bps;
149
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16 if (avctx->channels == 2)
150 12 bps1 = bps * 1.6;
151
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16 if (sample_rate1 == 44100) {
152
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13 if (bps1 >= 0.61)
153 13 s->use_noise_coding = 0;
154 else
155 high_freq = high_freq * 0.4;
156
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3 } else if (sample_rate1 == 22050) {
157 if (bps1 >= 1.16)
158 s->use_noise_coding = 0;
159 else if (bps1 >= 0.72)
160 high_freq = high_freq * 0.7;
161 else
162 high_freq = high_freq * 0.6;
163
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3 } else if (sample_rate1 == 16000) {
164
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1 if (bps > 0.5)
165 1 high_freq = high_freq * 0.5;
166 else
167 high_freq = high_freq * 0.3;
168
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2 } else if (sample_rate1 == 11025)
169 high_freq = high_freq * 0.7;
170
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2 else if (sample_rate1 == 8000) {
171
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2 if (bps <= 0.625)
172 1 high_freq = high_freq * 0.5;
173
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1 else if (bps > 0.75)
174 1 s->use_noise_coding = 0;
175 else
176 high_freq = high_freq * 0.65;
177 } else {
178 if (bps >= 0.8)
179 high_freq = high_freq * 0.75;
180 else if (bps >= 0.6)
181 high_freq = high_freq * 0.6;
182 else
183 high_freq = high_freq * 0.5;
184 }
185 ff_dlog(s->avctx, "flags2=0x%x\n", flags2);
186 ff_dlog(s->avctx, "version=%d channels=%d sample_rate=%d bitrate=%"PRId64" block_align=%d\n",
187 s->version, avctx->channels, avctx->sample_rate, avctx->bit_rate,
188 avctx->block_align);
189 ff_dlog(s->avctx, "bps=%f bps1=%f high_freq=%f bitoffset=%d\n",
190 bps, bps1, high_freq, s->byte_offset_bits);
191 ff_dlog(s->avctx, "use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
192 s->use_noise_coding, s->use_exp_vlc, s->nb_block_sizes);
193
194 /* compute the scale factor band sizes for each MDCT block size */
195 {
196 int a, b, pos, lpos, k, block_len, i, j, n;
197 const uint8_t *table;
198
199
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16 if (s->version == 1)
200 3 s->coefs_start = 3;
201 else
202 13 s->coefs_start = 0;
203
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55 for (k = 0; k < s->nb_block_sizes; k++) {
204 39 block_len = s->frame_len >> k;
205
206
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39 if (s->version == 1) {
207 3 lpos = 0;
208
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75 for (i = 0; i < 25; i++) {
209 75 a = ff_wma_critical_freqs[i];
210 75 b = avctx->sample_rate;
211 75 pos = ((block_len * 2 * a) + (b >> 1)) / b;
212
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75 if (pos > block_len)
213 3 pos = block_len;
214 75 s->exponent_bands[0][i] = pos - lpos;
215
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75 if (pos >= block_len) {
216 3 i++;
217 3 break;
218 }
219 72 lpos = pos;
220 }
221 3 s->exponent_sizes[0] = i;
222 } else {
223 /* hardcoded tables */
224 36 table = NULL;
225 36 a = s->frame_len_bits - BLOCK_MIN_BITS - k;
226
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36 if (a < 3) {
227
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21 if (avctx->sample_rate >= 44100)
228 15 table = exponent_band_44100[a];
229
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6 else if (avctx->sample_rate >= 32000)
230 table = exponent_band_32000[a];
231
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6 else if (avctx->sample_rate >= 22050)
232 table = exponent_band_22050[a];
233 }
234
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36 if (table) {
235 15 n = *table++;
236
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235 for (i = 0; i < n; i++)
237 220 s->exponent_bands[k][i] = table[i];
238 15 s->exponent_sizes[k] = n;
239 } else {
240 21 j = 0;
241 21 lpos = 0;
242
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495 for (i = 0; i < 25; i++) {
243 495 a = ff_wma_critical_freqs[i];
244 495 b = avctx->sample_rate;
245 495 pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
246 495 pos <<= 2;
247
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495 if (pos > block_len)
248 21 pos = block_len;
249
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495 if (pos > lpos)
250 489 s->exponent_bands[k][j++] = pos - lpos;
251
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495 if (pos >= block_len)
252 21 break;
253 474 lpos = pos;
254 }
255 21 s->exponent_sizes[k] = j;
256 }
257 }
258
259 /* max number of coefs */
260 39 s->coefs_end[k] = (s->frame_len - ((s->frame_len * 9) / 100)) >> k;
261 /* high freq computation */
262 39 s->high_band_start[k] = (int) ((block_len * 2 * high_freq) /
263 39 avctx->sample_rate + 0.5);
264 39 n = s->exponent_sizes[k];
265 39 j = 0;
266 39 pos = 0;
267
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823 for (i = 0; i < n; i++) {
268 int start, end;
269 784 start = pos;
270 784 pos += s->exponent_bands[k][i];
271 784 end = pos;
272
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784 if (start < s->high_band_start[k])
273 767 start = s->high_band_start[k];
274
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784 if (end > s->coefs_end[k])
275 45 end = s->coefs_end[k];
276
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784 if (end > start)
277 16 s->exponent_high_bands[k][j++] = end - start;
278 }
279 39 s->exponent_high_sizes[k] = j;
280 }
281 }
282
283 #ifdef TRACE
284 {
285 int i, j;
286 for (i = 0; i < s->nb_block_sizes; i++) {
287 ff_tlog(s->avctx, "%5d: n=%2d:",
288 s->frame_len >> i,
289 s->exponent_sizes[i]);
290 for (j = 0; j < s->exponent_sizes[i]; j++)
291 ff_tlog(s->avctx, " %d", s->exponent_bands[i][j]);
292 ff_tlog(s->avctx, "\n");
293 }
294 }
295 #endif /* TRACE */
296
297 /* init MDCT windows : simple sine window */
298
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55 for (i = 0; i < s->nb_block_sizes; i++) {
299 39 ff_init_ff_sine_windows(s->frame_len_bits - i);
300 39 s->windows[i] = ff_sine_windows[s->frame_len_bits - i];
301 }
302
303 16 s->reset_block_lengths = 1;
304
305
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16 if (s->use_noise_coding) {
306 /* init the noise generator */
307
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2 if (s->use_exp_vlc)
308 s->noise_mult = 0.02;
309 else
310 2 s->noise_mult = 0.04;
311
312 #ifdef TRACE
313 for (i = 0; i < NOISE_TAB_SIZE; i++)
314 s->noise_table[i] = 1.0 * s->noise_mult;
315 #else
316 {
317 unsigned int seed;
318 float norm;
319 2 seed = 1;
320 2 norm = (1.0 / (float) (1LL << 31)) * sqrt(3) * s->noise_mult;
321
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16386 for (i = 0; i < NOISE_TAB_SIZE; i++) {
322 16384 seed = seed * 314159 + 1;
323 16384 s->noise_table[i] = (float) ((int) seed) * norm;
324 }
325 }
326 #endif /* TRACE */
327 }
328
329 16 s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
330
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16 if (!s->fdsp)
331 return AVERROR(ENOMEM);
332
333 /* choose the VLC tables for the coefficients */
334 16 coef_vlc_table = 2;
335
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16 if (avctx->sample_rate >= 32000) {
336
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13 if (bps1 < 0.72)
337 coef_vlc_table = 0;
338
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13 else if (bps1 < 1.16)
339 2 coef_vlc_table = 1;
340 }
341 16 s->coef_vlcs[0] = &coef_vlcs[coef_vlc_table * 2];
342 16 s->coef_vlcs[1] = &coef_vlcs[coef_vlc_table * 2 + 1];
343 16 ret = init_coef_vlc(&s->coef_vlc[0], &s->run_table[0], &s->level_table[0],
344 &s->int_table[0], s->coef_vlcs[0]);
345
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16 if (ret < 0)
346 return ret;
347
348 16 return init_coef_vlc(&s->coef_vlc[1], &s->run_table[1], &s->level_table[1],
349 &s->int_table[1], s->coef_vlcs[1]);
350 }
351
352 3650 int ff_wma_total_gain_to_bits(int total_gain)
353 {
354
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3650 if (total_gain < 15)
355 return 13;
356
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3650 else if (total_gain < 32)
357 98 return 12;
358
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3552 else if (total_gain < 40)
359 284 return 11;
360
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3268 else if (total_gain < 45)
361 18 return 10;
362 else
363 3250 return 9;
364 }
365
366 16 int ff_wma_end(AVCodecContext *avctx)
367 {
368 16 WMACodecContext *s = avctx->priv_data;
369 int i;
370
371
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55 for (i = 0; i < s->nb_block_sizes; i++)
372 39 ff_mdct_end(&s->mdct_ctx[i]);
373
374
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16 if (s->use_exp_vlc)
375 13 ff_free_vlc(&s->exp_vlc);
376
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16 if (s->use_noise_coding)
377 2 ff_free_vlc(&s->hgain_vlc);
378
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48 for (i = 0; i < 2; i++) {
379 32 ff_free_vlc(&s->coef_vlc[i]);
380 32 av_freep(&s->run_table[i]);
381 32 av_freep(&s->level_table[i]);
382 32 av_freep(&s->int_table[i]);
383 }
384 16 av_freep(&s->fdsp);
385
386 16 return 0;
387 }
388
389 /**
390 * Decode an uncompressed coefficient.
391 * @param gb GetBitContext
392 * @return the decoded coefficient
393 */
394 3915 unsigned int ff_wma_get_large_val(GetBitContext *gb)
395 {
396 /** consumes up to 34 bits */
397 3915 int n_bits = 8;
398 /** decode length */
399
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3915 if (get_bits1(gb)) {
400 530 n_bits += 8;
401
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530 if (get_bits1(gb)) {
402 n_bits += 8;
403 if (get_bits1(gb))
404 n_bits += 7;
405 }
406 }
407 3915 return get_bits_long(gb, n_bits);
408 }
409
410 /**
411 * Decode run level compressed coefficients.
412 * @param avctx codec context
413 * @param gb bitstream reader context
414 * @param vlc vlc table for get_vlc2
415 * @param level_table level codes
416 * @param run_table run codes
417 * @param version 0 for wma1,2 1 for wmapro
418 * @param ptr output buffer
419 * @param offset offset in the output buffer
420 * @param num_coefs number of input coefficients
421 * @param block_len input buffer length (2^n)
422 * @param frame_len_bits number of bits for escaped run codes
423 * @param coef_nb_bits number of bits for escaped level codes
424 * @return 0 on success, -1 otherwise
425 */
426 2174 int ff_wma_run_level_decode(AVCodecContext *avctx, GetBitContext *gb,
427 VLC *vlc, const float *level_table,
428 const uint16_t *run_table, int version,
429 WMACoef *ptr, int offset, int num_coefs,
430 int block_len, int frame_len_bits,
431 int coef_nb_bits)
432 {
433 int code, level, sign;
434 2174 const uint32_t *ilvl = (const uint32_t *) level_table;
435 2174 uint32_t *iptr = (uint32_t *) ptr;
436 2174 const unsigned int coef_mask = block_len - 1;
437
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592299 for (; offset < num_coefs; offset++) {
438 592287 code = get_vlc2(gb, vlc->table, VLCBITS, VLCMAX);
439
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592287 if (code > 1) {
440 /** normal code */
441 586557 offset += run_table[code];
442 586557 sign = get_bits1(gb) - 1;
443 586557 iptr[offset & coef_mask] = ilvl[code] ^ (sign & 0x80000000);
444
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5730 } else if (code == 1) {
445 /** EOB */
446 2162 break;
447 } else {
448 /** escape */
449
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3568 if (!version) {
450 2926 level = get_bits(gb, coef_nb_bits);
451 /** NOTE: this is rather suboptimal. reading
452 * block_len_bits would be better */
453 2926 offset += get_bits(gb, frame_len_bits);
454 } else {
455 642 level = ff_wma_get_large_val(gb);
456 /** escape decode */
457
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642 if (get_bits1(gb)) {
458
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321 if (get_bits1(gb)) {
459
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263 if (get_bits1(gb)) {
460 av_log(avctx, AV_LOG_ERROR,
461 "broken escape sequence\n");
462 return AVERROR_INVALIDDATA;
463 } else
464 263 offset += get_bits(gb, frame_len_bits) + 4;
465 } else
466 58 offset += get_bits(gb, 2) + 1;
467 }
468 }
469 3568 sign = get_bits1(gb) - 1;
470 3568 ptr[offset & coef_mask] = (level ^ sign) - sign;
471 }
472 }
473 /** NOTE: EOB can be omitted */
474
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2174 if (offset > num_coefs) {
475 av_log(avctx, AV_LOG_ERROR,
476 "overflow (%d > %d) in spectral RLE, ignoring\n",
477 offset,
478 num_coefs
479 );
480 return AVERROR_INVALIDDATA;
481 }
482
483 2174 return 0;
484 }
485