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"
26 #include "wma_common.h"
32 /* XXX: use same run/length optimization as mpeg decoders */
33 //FIXME maybe split decode / encode or pass flag
34 static av_cold void init_coef_vlc(VLC *vlc, uint16_t **prun_table,
35 float **plevel_table, uint16_t **pint_table,
36 const CoefVLCTable *vlc_table)
39 const uint8_t *table_bits = vlc_table->huffbits;
40 const uint32_t *table_codes = vlc_table->huffcodes;
41 const uint16_t *levels_table = vlc_table->levels;
42 uint16_t *run_table, *level_table, *int_table;
44 int i, l, j, k, level;
46 init_vlc(vlc, VLCBITS, n, table_bits, 1, 1, table_codes, 4, 4, 0);
48 run_table = av_malloc(n * sizeof(uint16_t));
49 level_table = av_malloc(n * sizeof(uint16_t));
50 flevel_table= av_malloc(n * sizeof(*flevel_table));
51 int_table = av_malloc(n * sizeof(uint16_t));
57 l = levels_table[k++];
58 for (j = 0; j < l; j++) {
60 level_table[i] = level;
61 flevel_table[i]= level;
66 *prun_table = run_table;
67 *plevel_table = flevel_table;
68 *pint_table = int_table;
72 av_cold int ff_wma_init(AVCodecContext *avctx, int flags2)
74 WMACodecContext *s = avctx->priv_data;
76 float bps1, high_freq;
81 if ( avctx->sample_rate <= 0 || avctx->sample_rate > 50000
82 || avctx->channels <= 0 || avctx->channels > 2
83 || avctx->bit_rate <= 0)
86 ff_fmt_convert_init(&s->fmt_conv, avctx);
87 avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);
89 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;
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) {
136 bps = (float)avctx->bit_rate / (float)(avctx->channels * avctx->sample_rate);
137 s->byte_offset_bits = av_log2((int)(bps * s->frame_len / 8.0 + 0.5)) + 2;
138 if (s->byte_offset_bits + 3 > MIN_CACHE_BITS) {
139 av_log(avctx, AV_LOG_ERROR, "byte_offset_bits %d is too large\n", s->byte_offset_bits);
140 return AVERROR_PATCHWELCOME;
143 /* compute high frequency value and choose if noise coding should
146 if (avctx->channels == 2)
148 if (sample_rate1 == 44100) {
150 s->use_noise_coding = 0;
152 high_freq = high_freq * 0.4;
154 } else if (sample_rate1 == 22050) {
156 s->use_noise_coding = 0;
157 } else if (bps1 >= 0.72) {
158 high_freq = high_freq * 0.7;
160 high_freq = high_freq * 0.6;
162 } else if (sample_rate1 == 16000) {
164 high_freq = high_freq * 0.5;
166 high_freq = high_freq * 0.3;
168 } else if (sample_rate1 == 11025) {
169 high_freq = high_freq * 0.7;
170 } else if (sample_rate1 == 8000) {
172 high_freq = high_freq * 0.5;
173 } else if (bps > 0.75) {
174 s->use_noise_coding = 0;
176 high_freq = high_freq * 0.65;
180 high_freq = high_freq * 0.75;
181 } else if (bps >= 0.6) {
182 high_freq = high_freq * 0.6;
184 high_freq = high_freq * 0.5;
187 av_dlog(s->avctx, "flags2=0x%x\n", flags2);
188 av_dlog(s->avctx, "version=%d channels=%d sample_rate=%d bitrate=%d block_align=%d\n",
189 s->version, avctx->channels, avctx->sample_rate, avctx->bit_rate,
191 av_dlog(s->avctx, "bps=%f bps1=%f high_freq=%f bitoffset=%d\n",
192 bps, bps1, high_freq, s->byte_offset_bits);
193 av_dlog(s->avctx, "use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
194 s->use_noise_coding, s->use_exp_vlc, s->nb_block_sizes);
196 /* compute the scale factor band sizes for each MDCT block size */
198 int a, b, pos, lpos, k, block_len, i, j, n;
199 const uint8_t *table;
201 if (s->version == 1) {
206 for (k = 0; k < s->nb_block_sizes; k++) {
207 block_len = s->frame_len >> k;
209 if (s->version == 1) {
211 for (i = 0; i < 25; i++) {
212 a = ff_wma_critical_freqs[i];
213 b = avctx->sample_rate;
214 pos = ((block_len * 2 * a) + (b >> 1)) / b;
217 s->exponent_bands[0][i] = pos - lpos;
218 if (pos >= block_len) {
224 s->exponent_sizes[0] = i;
226 /* hardcoded tables */
228 a = s->frame_len_bits - BLOCK_MIN_BITS - k;
230 if (avctx->sample_rate >= 44100) {
231 table = exponent_band_44100[a];
232 } else if (avctx->sample_rate >= 32000) {
233 table = exponent_band_32000[a];
234 } else if (avctx->sample_rate >= 22050) {
235 table = exponent_band_22050[a];
240 for (i = 0; i < n; i++)
241 s->exponent_bands[k][i] = table[i];
242 s->exponent_sizes[k] = n;
246 for (i = 0; i < 25; i++) {
247 a = ff_wma_critical_freqs[i];
248 b = avctx->sample_rate;
249 pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
254 s->exponent_bands[k][j++] = pos - lpos;
255 if (pos >= block_len)
259 s->exponent_sizes[k] = j;
263 /* max number of coefs */
264 s->coefs_end[k] = (s->frame_len - ((s->frame_len * 9) / 100)) >> k;
265 /* high freq computation */
266 s->high_band_start[k] = (int)((block_len * 2 * high_freq) /
267 avctx->sample_rate + 0.5);
268 n = s->exponent_sizes[k];
271 for (i = 0; i < n; i++) {
274 pos += s->exponent_bands[k][i];
276 if (start < s->high_band_start[k])
277 start = s->high_band_start[k];
278 if (end > s->coefs_end[k])
279 end = s->coefs_end[k];
281 s->exponent_high_bands[k][j++] = end - start;
283 s->exponent_high_sizes[k] = j;
285 tprintf(s->avctx, "%5d: coefs_end=%d high_band_start=%d nb_high_bands=%d: ",
288 s->high_band_start[k],
289 s->exponent_high_sizes[k]);
290 for (j = 0; j < s->exponent_high_sizes[k]; j++)
291 tprintf(s->avctx, " %d", s->exponent_high_bands[k][j]);
292 tprintf(s->avctx, "\n");
300 for (i = 0; i < s->nb_block_sizes; i++) {
301 tprintf(s->avctx, "%5d: n=%2d:",
303 s->exponent_sizes[i]);
304 for (j = 0; j < s->exponent_sizes[i]; j++)
305 tprintf(s->avctx, " %d", s->exponent_bands[i][j]);
306 tprintf(s->avctx, "\n");
311 /* init MDCT windows : simple sinus window */
312 for (i = 0; i < s->nb_block_sizes; i++) {
313 ff_init_ff_sine_windows(s->frame_len_bits - i);
314 s->windows[i] = ff_sine_windows[s->frame_len_bits - i];
317 s->reset_block_lengths = 1;
319 if (s->use_noise_coding) {
321 /* init the noise generator */
322 if (s->use_exp_vlc) {
323 s->noise_mult = 0.02;
325 s->noise_mult = 0.04;
329 for (i = 0; i < NOISE_TAB_SIZE; i++)
330 s->noise_table[i] = 1.0 * s->noise_mult;
336 norm = (1.0 / (float)(1LL << 31)) * sqrt(3) * s->noise_mult;
337 for (i = 0; i < NOISE_TAB_SIZE; i++) {
338 seed = seed * 314159 + 1;
339 s->noise_table[i] = (float)((int)seed) * norm;
345 /* choose the VLC tables for the coefficients */
347 if (avctx->sample_rate >= 32000) {
350 } else if (bps1 < 1.16) {
354 s->coef_vlcs[0]= &coef_vlcs[coef_vlc_table * 2 ];
355 s->coef_vlcs[1]= &coef_vlcs[coef_vlc_table * 2 + 1];
356 init_coef_vlc(&s->coef_vlc[0], &s->run_table[0], &s->level_table[0], &s->int_table[0],
358 init_coef_vlc(&s->coef_vlc[1], &s->run_table[1], &s->level_table[1], &s->int_table[1],
364 int ff_wma_total_gain_to_bits(int total_gain)
366 if (total_gain < 15) return 13;
367 else if (total_gain < 32) return 12;
368 else if (total_gain < 40) return 11;
369 else if (total_gain < 45) return 10;
373 int ff_wma_end(AVCodecContext *avctx)
375 WMACodecContext *s = avctx->priv_data;
378 for (i = 0; i < s->nb_block_sizes; i++)
379 ff_mdct_end(&s->mdct_ctx[i]);
381 if (s->use_exp_vlc) {
382 ff_free_vlc(&s->exp_vlc);
384 if (s->use_noise_coding) {
385 ff_free_vlc(&s->hgain_vlc);
387 for (i = 0; i < 2; i++) {
388 ff_free_vlc(&s->coef_vlc[i]);
389 av_free(s->run_table[i]);
390 av_free(s->level_table[i]);
391 av_free(s->int_table[i]);
398 * Decode an uncompressed coefficient.
399 * @param gb GetBitContext
400 * @return the decoded coefficient
402 unsigned int ff_wma_get_large_val(GetBitContext* gb)
404 /** consumes up to 34 bits */
416 return get_bits_long(gb, n_bits);
420 * Decode run level compressed coefficients.
421 * @param avctx codec context
422 * @param gb bitstream reader context
423 * @param vlc vlc table for get_vlc2
424 * @param level_table level codes
425 * @param run_table run codes
426 * @param version 0 for wma1,2 1 for wmapro
427 * @param ptr output buffer
428 * @param offset offset in the output buffer
429 * @param num_coefs number of input coefficents
430 * @param block_len input buffer length (2^n)
431 * @param frame_len_bits number of bits for escaped run codes
432 * @param coef_nb_bits number of bits for escaped level codes
433 * @return 0 on success, -1 otherwise
435 int ff_wma_run_level_decode(AVCodecContext* avctx, GetBitContext* gb,
437 const float *level_table, const uint16_t *run_table,
438 int version, WMACoef *ptr, int offset,
439 int num_coefs, int block_len, int frame_len_bits,
442 int code, level, sign;
443 const uint32_t *ilvl = (const uint32_t*)level_table;
444 uint32_t *iptr = (uint32_t*)ptr;
445 const unsigned int coef_mask = block_len - 1;
446 for (; offset < num_coefs; offset++) {
447 code = get_vlc2(gb, vlc->table, VLCBITS, VLCMAX);
450 offset += run_table[code];
451 sign = get_bits1(gb) - 1;
452 iptr[offset & coef_mask] = ilvl[code] ^ sign<<31;
453 } else if (code == 1) {
459 level = get_bits(gb, coef_nb_bits);
460 /** NOTE: this is rather suboptimal. reading
461 block_len_bits would be better */
462 offset += get_bits(gb, frame_len_bits);
464 level = ff_wma_get_large_val(gb);
469 av_log(avctx,AV_LOG_ERROR,
470 "broken escape sequence\n");
473 offset += get_bits(gb, frame_len_bits) + 4;
475 offset += get_bits(gb, 2) + 1;
478 sign = get_bits1(gb) - 1;
479 ptr[offset & coef_mask] = (level^sign) - sign;
482 /** NOTE: EOB can be omitted */
483 if (offset > num_coefs) {
484 av_log(avctx, AV_LOG_ERROR, "overflow in spectral RLE, ignoring\n");