3 * Copyright (c) 2002-2007 The Libav Project
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/attributes.h"
27 #include "wma_common.h"
28 #include "wma_freqs.h"
34 /* XXX: use same run/length optimization as mpeg decoders */
35 // FIXME maybe split decode / encode or pass flag
36 static av_cold void init_coef_vlc(VLC *vlc, uint16_t **prun_table,
37 float **plevel_table, uint16_t **pint_table,
38 const CoefVLCTable *vlc_table)
41 const uint8_t *table_bits = vlc_table->huffbits;
42 const uint32_t *table_codes = vlc_table->huffcodes;
43 const uint16_t *levels_table = vlc_table->levels;
44 uint16_t *run_table, *level_table, *int_table;
46 int i, l, j, k, level;
48 init_vlc(vlc, VLCBITS, n, table_bits, 1, 1, table_codes, 4, 4, 0);
50 run_table = av_malloc(n * sizeof(uint16_t));
51 level_table = av_malloc(n * sizeof(uint16_t));
52 flevel_table = av_malloc(n * sizeof(*flevel_table));
53 int_table = av_malloc(n * sizeof(uint16_t));
59 l = levels_table[k++];
60 for (j = 0; j < l; j++) {
62 level_table[i] = level;
63 flevel_table[i] = level;
68 *prun_table = run_table;
69 *plevel_table = flevel_table;
70 *pint_table = int_table;
74 av_cold int ff_wma_init(AVCodecContext *avctx, int flags2)
76 WMACodecContext *s = avctx->priv_data;
78 float bps1, high_freq;
83 if (avctx->sample_rate <= 0 || avctx->sample_rate > 50000 ||
84 avctx->channels <= 0 || avctx->channels > 2 ||
88 ff_fmt_convert_init(&s->fmt_conv, avctx);
89 avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);
91 if (avctx->codec->id == AV_CODEC_ID_WMAV1)
96 /* compute MDCT block size */
97 s->frame_len_bits = ff_wma_get_frame_len_bits(avctx->sample_rate,
99 s->next_block_len_bits = s->frame_len_bits;
100 s->prev_block_len_bits = s->frame_len_bits;
101 s->block_len_bits = s->frame_len_bits;
103 s->frame_len = 1 << s->frame_len_bits;
104 if (s->use_variable_block_len) {
106 nb = ((flags2 >> 3) & 3) + 1;
107 if ((avctx->bit_rate / avctx->channels) >= 32000)
109 nb_max = s->frame_len_bits - BLOCK_MIN_BITS;
112 s->nb_block_sizes = nb + 1;
114 s->nb_block_sizes = 1;
116 /* init rate dependent parameters */
117 s->use_noise_coding = 1;
118 high_freq = avctx->sample_rate * 0.5;
120 /* if version 2, then the rates are normalized */
121 sample_rate1 = avctx->sample_rate;
122 if (s->version == 2) {
123 if (sample_rate1 >= 44100)
124 sample_rate1 = 44100;
125 else if (sample_rate1 >= 22050)
126 sample_rate1 = 22050;
127 else if (sample_rate1 >= 16000)
128 sample_rate1 = 16000;
129 else if (sample_rate1 >= 11025)
130 sample_rate1 = 11025;
131 else if (sample_rate1 >= 8000)
135 bps = (float) avctx->bit_rate /
136 (float) (avctx->channels * avctx->sample_rate);
137 s->byte_offset_bits = av_log2((int) (bps * s->frame_len / 8.0 + 0.5)) + 2;
139 /* compute high frequency value and choose if noise coding should
142 if (avctx->channels == 2)
144 if (sample_rate1 == 44100) {
146 s->use_noise_coding = 0;
148 high_freq = high_freq * 0.4;
149 } else if (sample_rate1 == 22050) {
151 s->use_noise_coding = 0;
152 else if (bps1 >= 0.72)
153 high_freq = high_freq * 0.7;
155 high_freq = high_freq * 0.6;
156 } else if (sample_rate1 == 16000) {
158 high_freq = high_freq * 0.5;
160 high_freq = high_freq * 0.3;
161 } else if (sample_rate1 == 11025)
162 high_freq = high_freq * 0.7;
163 else if (sample_rate1 == 8000) {
165 high_freq = high_freq * 0.5;
167 s->use_noise_coding = 0;
169 high_freq = high_freq * 0.65;
172 high_freq = high_freq * 0.75;
174 high_freq = high_freq * 0.6;
176 high_freq = high_freq * 0.5;
178 av_dlog(s->avctx, "flags2=0x%x\n", flags2);
179 av_dlog(s->avctx, "version=%d channels=%d sample_rate=%d bitrate=%d block_align=%d\n",
180 s->version, avctx->channels, avctx->sample_rate, avctx->bit_rate,
182 av_dlog(s->avctx, "bps=%f bps1=%f high_freq=%f bitoffset=%d\n",
183 bps, bps1, high_freq, s->byte_offset_bits);
184 av_dlog(s->avctx, "use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
185 s->use_noise_coding, s->use_exp_vlc, s->nb_block_sizes);
187 /* compute the scale factor band sizes for each MDCT block size */
189 int a, b, pos, lpos, k, block_len, i, j, n;
190 const uint8_t *table;
196 for (k = 0; k < s->nb_block_sizes; k++) {
197 block_len = s->frame_len >> k;
199 if (s->version == 1) {
201 for (i = 0; i < 25; i++) {
202 a = ff_wma_critical_freqs[i];
203 b = avctx->sample_rate;
204 pos = ((block_len * 2 * a) + (b >> 1)) / b;
207 s->exponent_bands[0][i] = pos - lpos;
208 if (pos >= block_len) {
214 s->exponent_sizes[0] = i;
216 /* hardcoded tables */
218 a = s->frame_len_bits - BLOCK_MIN_BITS - k;
220 if (avctx->sample_rate >= 44100)
221 table = exponent_band_44100[a];
222 else if (avctx->sample_rate >= 32000)
223 table = exponent_band_32000[a];
224 else if (avctx->sample_rate >= 22050)
225 table = exponent_band_22050[a];
229 for (i = 0; i < n; i++)
230 s->exponent_bands[k][i] = table[i];
231 s->exponent_sizes[k] = n;
235 for (i = 0; i < 25; i++) {
236 a = ff_wma_critical_freqs[i];
237 b = avctx->sample_rate;
238 pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
243 s->exponent_bands[k][j++] = pos - lpos;
244 if (pos >= block_len)
248 s->exponent_sizes[k] = j;
252 /* max number of coefs */
253 s->coefs_end[k] = (s->frame_len - ((s->frame_len * 9) / 100)) >> k;
254 /* high freq computation */
255 s->high_band_start[k] = (int) ((block_len * 2 * high_freq) /
256 avctx->sample_rate + 0.5);
257 n = s->exponent_sizes[k];
260 for (i = 0; i < n; i++) {
263 pos += s->exponent_bands[k][i];
265 if (start < s->high_band_start[k])
266 start = s->high_band_start[k];
267 if (end > s->coefs_end[k])
268 end = s->coefs_end[k];
270 s->exponent_high_bands[k][j++] = end - start;
272 s->exponent_high_sizes[k] = j;
274 tprintf(s->avctx, "%5d: coefs_end=%d high_band_start=%d nb_high_bands=%d: ",
277 s->high_band_start[k],
278 s->exponent_high_sizes[k]);
279 for (j = 0; j < s->exponent_high_sizes[k]; j++)
280 tprintf(s->avctx, " %d", s->exponent_high_bands[k][j]);
281 tprintf(s->avctx, "\n");
289 for (i = 0; i < s->nb_block_sizes; i++) {
290 tprintf(s->avctx, "%5d: n=%2d:",
292 s->exponent_sizes[i]);
293 for (j = 0; j < s->exponent_sizes[i]; j++)
294 tprintf(s->avctx, " %d", s->exponent_bands[i][j]);
295 tprintf(s->avctx, "\n");
300 /* init MDCT windows : simple sine window */
301 for (i = 0; i < s->nb_block_sizes; i++) {
302 ff_init_ff_sine_windows(s->frame_len_bits - i);
303 s->windows[i] = ff_sine_windows[s->frame_len_bits - i];
306 s->reset_block_lengths = 1;
308 if (s->use_noise_coding) {
309 /* init the noise generator */
311 s->noise_mult = 0.02;
313 s->noise_mult = 0.04;
316 for (i = 0; i < NOISE_TAB_SIZE; i++)
317 s->noise_table[i] = 1.0 * s->noise_mult;
323 norm = (1.0 / (float) (1LL << 31)) * sqrt(3) * s->noise_mult;
324 for (i = 0; i < NOISE_TAB_SIZE; i++) {
325 seed = seed * 314159 + 1;
326 s->noise_table[i] = (float) ((int) seed) * norm;
332 /* choose the VLC tables for the coefficients */
334 if (avctx->sample_rate >= 32000) {
337 else if (bps1 < 1.16)
340 s->coef_vlcs[0] = &coef_vlcs[coef_vlc_table * 2];
341 s->coef_vlcs[1] = &coef_vlcs[coef_vlc_table * 2 + 1];
342 init_coef_vlc(&s->coef_vlc[0], &s->run_table[0], &s->level_table[0],
343 &s->int_table[0], s->coef_vlcs[0]);
344 init_coef_vlc(&s->coef_vlc[1], &s->run_table[1], &s->level_table[1],
345 &s->int_table[1], s->coef_vlcs[1]);
350 int ff_wma_total_gain_to_bits(int total_gain)
354 else if (total_gain < 32)
356 else if (total_gain < 40)
358 else if (total_gain < 45)
364 int ff_wma_end(AVCodecContext *avctx)
366 WMACodecContext *s = avctx->priv_data;
369 for (i = 0; i < s->nb_block_sizes; i++)
370 ff_mdct_end(&s->mdct_ctx[i]);
373 ff_free_vlc(&s->exp_vlc);
374 if (s->use_noise_coding)
375 ff_free_vlc(&s->hgain_vlc);
376 for (i = 0; i < 2; i++) {
377 ff_free_vlc(&s->coef_vlc[i]);
378 av_free(s->run_table[i]);
379 av_free(s->level_table[i]);
380 av_free(s->int_table[i]);
387 * Decode an uncompressed coefficient.
388 * @param gb GetBitContext
389 * @return the decoded coefficient
391 unsigned int ff_wma_get_large_val(GetBitContext *gb)
393 /** consumes up to 34 bits */
404 return get_bits_long(gb, n_bits);
408 * Decode run level compressed coefficients.
409 * @param avctx codec context
410 * @param gb bitstream reader context
411 * @param vlc vlc table for get_vlc2
412 * @param level_table level codes
413 * @param run_table run codes
414 * @param version 0 for wma1,2 1 for wmapro
415 * @param ptr output buffer
416 * @param offset offset in the output buffer
417 * @param num_coefs number of input coefficents
418 * @param block_len input buffer length (2^n)
419 * @param frame_len_bits number of bits for escaped run codes
420 * @param coef_nb_bits number of bits for escaped level codes
421 * @return 0 on success, -1 otherwise
423 int ff_wma_run_level_decode(AVCodecContext *avctx, GetBitContext *gb,
424 VLC *vlc, const float *level_table,
425 const uint16_t *run_table, int version,
426 WMACoef *ptr, int offset, int num_coefs,
427 int block_len, int frame_len_bits,
430 int code, level, sign;
431 const uint32_t *ilvl = (const uint32_t *) level_table;
432 uint32_t *iptr = (uint32_t *) ptr;
433 const unsigned int coef_mask = block_len - 1;
434 for (; offset < num_coefs; offset++) {
435 code = get_vlc2(gb, vlc->table, VLCBITS, VLCMAX);
438 offset += run_table[code];
439 sign = get_bits1(gb) - 1;
440 iptr[offset & coef_mask] = ilvl[code] ^ sign << 31;
441 } else if (code == 1) {
447 level = get_bits(gb, coef_nb_bits);
448 /** NOTE: this is rather suboptimal. reading
449 * block_len_bits would be better */
450 offset += get_bits(gb, frame_len_bits);
452 level = ff_wma_get_large_val(gb);
457 av_log(avctx, AV_LOG_ERROR,
458 "broken escape sequence\n");
461 offset += get_bits(gb, frame_len_bits) + 4;
463 offset += get_bits(gb, 2) + 1;
466 sign = get_bits1(gb) - 1;
467 ptr[offset & coef_mask] = (level ^ sign) - sign;
470 /** NOTE: EOB can be omitted */
471 if (offset > num_coefs) {
472 av_log(avctx, AV_LOG_ERROR, "overflow in spectral RLE, ignoring\n");