3 * Copyright (c) 2002-2007 The FFmpeg Project
5 * This file is part of FFmpeg.
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.
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.
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
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_array(n, sizeof(uint16_t));
51 level_table = av_malloc_array(n, sizeof(uint16_t));
52 flevel_table = av_malloc_array(n, sizeof(*flevel_table));
53 int_table = av_malloc_array(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);
90 if (avctx->codec->id == AV_CODEC_ID_WMAV1)
95 /* compute MDCT block size */
96 s->frame_len_bits = ff_wma_get_frame_len_bits(avctx->sample_rate,
98 s->next_block_len_bits = s->frame_len_bits;
99 s->prev_block_len_bits = s->frame_len_bits;
100 s->block_len_bits = s->frame_len_bits;
102 s->frame_len = 1 << s->frame_len_bits;
103 if (s->use_variable_block_len) {
105 nb = ((flags2 >> 3) & 3) + 1;
106 if ((avctx->bit_rate / avctx->channels) >= 32000)
108 nb_max = s->frame_len_bits - BLOCK_MIN_BITS;
111 s->nb_block_sizes = nb + 1;
113 s->nb_block_sizes = 1;
115 /* init rate dependent parameters */
116 s->use_noise_coding = 1;
117 high_freq = avctx->sample_rate * 0.5;
119 /* if version 2, then the rates are normalized */
120 sample_rate1 = avctx->sample_rate;
121 if (s->version == 2) {
122 if (sample_rate1 >= 44100)
123 sample_rate1 = 44100;
124 else if (sample_rate1 >= 22050)
125 sample_rate1 = 22050;
126 else if (sample_rate1 >= 16000)
127 sample_rate1 = 16000;
128 else if (sample_rate1 >= 11025)
129 sample_rate1 = 11025;
130 else if (sample_rate1 >= 8000)
134 bps = (float) avctx->bit_rate /
135 (float) (avctx->channels * avctx->sample_rate);
136 s->byte_offset_bits = av_log2((int) (bps * s->frame_len / 8.0 + 0.5)) + 2;
137 if (s->byte_offset_bits + 3 > MIN_CACHE_BITS) {
138 av_log(avctx, AV_LOG_ERROR, "byte_offset_bits %d is too large\n", s->byte_offset_bits);
139 return AVERROR_PATCHWELCOME;
142 /* compute high frequency value and choose if noise coding should
145 if (avctx->channels == 2)
147 if (sample_rate1 == 44100) {
149 s->use_noise_coding = 0;
151 high_freq = high_freq * 0.4;
152 } else if (sample_rate1 == 22050) {
154 s->use_noise_coding = 0;
155 else if (bps1 >= 0.72)
156 high_freq = high_freq * 0.7;
158 high_freq = high_freq * 0.6;
159 } else if (sample_rate1 == 16000) {
161 high_freq = high_freq * 0.5;
163 high_freq = high_freq * 0.3;
164 } else if (sample_rate1 == 11025)
165 high_freq = high_freq * 0.7;
166 else if (sample_rate1 == 8000) {
168 high_freq = high_freq * 0.5;
170 s->use_noise_coding = 0;
172 high_freq = high_freq * 0.65;
175 high_freq = high_freq * 0.75;
177 high_freq = high_freq * 0.6;
179 high_freq = high_freq * 0.5;
181 av_dlog(s->avctx, "flags2=0x%x\n", flags2);
182 av_dlog(s->avctx, "version=%d channels=%d sample_rate=%d bitrate=%d block_align=%d\n",
183 s->version, avctx->channels, avctx->sample_rate, avctx->bit_rate,
185 av_dlog(s->avctx, "bps=%f bps1=%f high_freq=%f bitoffset=%d\n",
186 bps, bps1, high_freq, s->byte_offset_bits);
187 av_dlog(s->avctx, "use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
188 s->use_noise_coding, s->use_exp_vlc, s->nb_block_sizes);
190 /* compute the scale factor band sizes for each MDCT block size */
192 int a, b, pos, lpos, k, block_len, i, j, n;
193 const uint8_t *table;
199 for (k = 0; k < s->nb_block_sizes; k++) {
200 block_len = s->frame_len >> k;
202 if (s->version == 1) {
204 for (i = 0; i < 25; i++) {
205 a = ff_wma_critical_freqs[i];
206 b = avctx->sample_rate;
207 pos = ((block_len * 2 * a) + (b >> 1)) / b;
210 s->exponent_bands[0][i] = pos - lpos;
211 if (pos >= block_len) {
217 s->exponent_sizes[0] = i;
219 /* hardcoded tables */
221 a = s->frame_len_bits - BLOCK_MIN_BITS - k;
223 if (avctx->sample_rate >= 44100)
224 table = exponent_band_44100[a];
225 else if (avctx->sample_rate >= 32000)
226 table = exponent_band_32000[a];
227 else if (avctx->sample_rate >= 22050)
228 table = exponent_band_22050[a];
232 for (i = 0; i < n; i++)
233 s->exponent_bands[k][i] = table[i];
234 s->exponent_sizes[k] = n;
238 for (i = 0; i < 25; i++) {
239 a = ff_wma_critical_freqs[i];
240 b = avctx->sample_rate;
241 pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
246 s->exponent_bands[k][j++] = pos - lpos;
247 if (pos >= block_len)
251 s->exponent_sizes[k] = j;
255 /* max number of coefs */
256 s->coefs_end[k] = (s->frame_len - ((s->frame_len * 9) / 100)) >> k;
257 /* high freq computation */
258 s->high_band_start[k] = (int) ((block_len * 2 * high_freq) /
259 avctx->sample_rate + 0.5);
260 n = s->exponent_sizes[k];
263 for (i = 0; i < n; i++) {
266 pos += s->exponent_bands[k][i];
268 if (start < s->high_band_start[k])
269 start = s->high_band_start[k];
270 if (end > s->coefs_end[k])
271 end = s->coefs_end[k];
273 s->exponent_high_bands[k][j++] = end - start;
275 s->exponent_high_sizes[k] = j;
277 tprintf(s->avctx, "%5d: coefs_end=%d high_band_start=%d nb_high_bands=%d: ",
280 s->high_band_start[k],
281 s->exponent_high_sizes[k]);
282 for (j = 0; j < s->exponent_high_sizes[k]; j++)
283 tprintf(s->avctx, " %d", s->exponent_high_bands[k][j]);
284 tprintf(s->avctx, "\n");
292 for (i = 0; i < s->nb_block_sizes; i++) {
293 tprintf(s->avctx, "%5d: n=%2d:",
295 s->exponent_sizes[i]);
296 for (j = 0; j < s->exponent_sizes[i]; j++)
297 tprintf(s->avctx, " %d", s->exponent_bands[i][j]);
298 tprintf(s->avctx, "\n");
303 /* init MDCT windows : simple sine window */
304 for (i = 0; i < s->nb_block_sizes; i++) {
305 ff_init_ff_sine_windows(s->frame_len_bits - i);
306 s->windows[i] = ff_sine_windows[s->frame_len_bits - i];
309 s->reset_block_lengths = 1;
311 if (s->use_noise_coding) {
312 /* init the noise generator */
314 s->noise_mult = 0.02;
316 s->noise_mult = 0.04;
319 for (i = 0; i < NOISE_TAB_SIZE; i++)
320 s->noise_table[i] = 1.0 * s->noise_mult;
326 norm = (1.0 / (float) (1LL << 31)) * sqrt(3) * s->noise_mult;
327 for (i = 0; i < NOISE_TAB_SIZE; i++) {
328 seed = seed * 314159 + 1;
329 s->noise_table[i] = (float) ((int) seed) * norm;
335 s->fdsp = avpriv_float_dsp_alloc(avctx->flags & CODEC_FLAG_BITEXACT);
337 return AVERROR(ENOMEM);
339 /* choose the VLC tables for the coefficients */
341 if (avctx->sample_rate >= 32000) {
344 else if (bps1 < 1.16)
347 s->coef_vlcs[0] = &coef_vlcs[coef_vlc_table * 2];
348 s->coef_vlcs[1] = &coef_vlcs[coef_vlc_table * 2 + 1];
349 init_coef_vlc(&s->coef_vlc[0], &s->run_table[0], &s->level_table[0],
350 &s->int_table[0], s->coef_vlcs[0]);
351 init_coef_vlc(&s->coef_vlc[1], &s->run_table[1], &s->level_table[1],
352 &s->int_table[1], s->coef_vlcs[1]);
357 int ff_wma_total_gain_to_bits(int total_gain)
361 else if (total_gain < 32)
363 else if (total_gain < 40)
365 else if (total_gain < 45)
371 int ff_wma_end(AVCodecContext *avctx)
373 WMACodecContext *s = avctx->priv_data;
376 for (i = 0; i < s->nb_block_sizes; i++)
377 ff_mdct_end(&s->mdct_ctx[i]);
380 ff_free_vlc(&s->exp_vlc);
381 if (s->use_noise_coding)
382 ff_free_vlc(&s->hgain_vlc);
383 for (i = 0; i < 2; i++) {
384 ff_free_vlc(&s->coef_vlc[i]);
385 av_freep(&s->run_table[i]);
386 av_freep(&s->level_table[i]);
387 av_freep(&s->int_table[i]);
395 * Decode an uncompressed coefficient.
396 * @param gb GetBitContext
397 * @return the decoded coefficient
399 unsigned int ff_wma_get_large_val(GetBitContext *gb)
401 /** consumes up to 34 bits */
412 return get_bits_long(gb, n_bits);
416 * Decode run level compressed coefficients.
417 * @param avctx codec context
418 * @param gb bitstream reader context
419 * @param vlc vlc table for get_vlc2
420 * @param level_table level codes
421 * @param run_table run codes
422 * @param version 0 for wma1,2 1 for wmapro
423 * @param ptr output buffer
424 * @param offset offset in the output buffer
425 * @param num_coefs number of input coefficents
426 * @param block_len input buffer length (2^n)
427 * @param frame_len_bits number of bits for escaped run codes
428 * @param coef_nb_bits number of bits for escaped level codes
429 * @return 0 on success, -1 otherwise
431 int ff_wma_run_level_decode(AVCodecContext *avctx, GetBitContext *gb,
432 VLC *vlc, const float *level_table,
433 const uint16_t *run_table, int version,
434 WMACoef *ptr, int offset, int num_coefs,
435 int block_len, int frame_len_bits,
438 int code, level, sign;
439 const uint32_t *ilvl = (const uint32_t *) level_table;
440 uint32_t *iptr = (uint32_t *) ptr;
441 const unsigned int coef_mask = block_len - 1;
442 for (; offset < num_coefs; offset++) {
443 code = get_vlc2(gb, vlc->table, VLCBITS, VLCMAX);
446 offset += run_table[code];
447 sign = get_bits1(gb) - 1;
448 iptr[offset & coef_mask] = ilvl[code] ^ sign << 31;
449 } else if (code == 1) {
455 level = get_bits(gb, coef_nb_bits);
456 /** NOTE: this is rather suboptimal. reading
457 * block_len_bits would be better */
458 offset += get_bits(gb, frame_len_bits);
460 level = ff_wma_get_large_val(gb);
465 av_log(avctx, AV_LOG_ERROR,
466 "broken escape sequence\n");
469 offset += get_bits(gb, frame_len_bits) + 4;
471 offset += get_bits(gb, 2) + 1;
474 sign = get_bits1(gb) - 1;
475 ptr[offset & coef_mask] = (level ^ sign) - sign;
478 /** NOTE: EOB can be omitted */
479 if (offset > num_coefs) {
480 av_log(avctx, AV_LOG_ERROR, "overflow in spectral RLE, ignoring\n");