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
25 #include "wma_common.h"
31 /* XXX: use same run/length optimization as mpeg decoders */
32 //FIXME maybe split decode / encode or pass flag
33 static void init_coef_vlc(VLC *vlc, uint16_t **prun_table,
34 float **plevel_table, uint16_t **pint_table,
35 const CoefVLCTable *vlc_table)
38 const uint8_t *table_bits = vlc_table->huffbits;
39 const uint32_t *table_codes = vlc_table->huffcodes;
40 const uint16_t *levels_table = vlc_table->levels;
41 uint16_t *run_table, *level_table, *int_table;
43 int i, l, j, k, level;
45 init_vlc(vlc, VLCBITS, n, table_bits, 1, 1, table_codes, 4, 4, 0);
47 run_table = av_malloc(n * sizeof(uint16_t));
48 level_table = av_malloc(n * sizeof(uint16_t));
49 flevel_table= av_malloc(n * sizeof(*flevel_table));
50 int_table = av_malloc(n * sizeof(uint16_t));
56 l = levels_table[k++];
57 for (j = 0; j < l; j++) {
59 level_table[i] = level;
60 flevel_table[i]= level;
65 *prun_table = run_table;
66 *plevel_table = flevel_table;
67 *pint_table = int_table;
71 int ff_wma_init(AVCodecContext *avctx, int flags2)
73 WMACodecContext *s = avctx->priv_data;
75 float bps1, high_freq;
80 if ( avctx->sample_rate <= 0 || avctx->sample_rate > 50000
81 || avctx->channels <= 0 || avctx->channels > 2
82 || avctx->bit_rate <= 0)
85 ff_dsputil_init(&s->dsp, avctx);
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;
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;
150 } else if (sample_rate1 == 22050) {
152 s->use_noise_coding = 0;
153 } else if (bps1 >= 0.72) {
154 high_freq = high_freq * 0.7;
156 high_freq = high_freq * 0.6;
158 } else if (sample_rate1 == 16000) {
160 high_freq = high_freq * 0.5;
162 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;
169 } else if (bps > 0.75) {
170 s->use_noise_coding = 0;
172 high_freq = high_freq * 0.65;
176 high_freq = high_freq * 0.75;
177 } else if (bps >= 0.6) {
178 high_freq = high_freq * 0.6;
180 high_freq = high_freq * 0.5;
183 av_dlog(s->avctx, "flags2=0x%x\n", flags2);
184 av_dlog(s->avctx, "version=%d channels=%d sample_rate=%d bitrate=%d block_align=%d\n",
185 s->version, avctx->channels, avctx->sample_rate, avctx->bit_rate,
187 av_dlog(s->avctx, "bps=%f bps1=%f high_freq=%f bitoffset=%d\n",
188 bps, bps1, high_freq, s->byte_offset_bits);
189 av_dlog(s->avctx, "use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
190 s->use_noise_coding, s->use_exp_vlc, s->nb_block_sizes);
192 /* compute the scale factor band sizes for each MDCT block size */
194 int a, b, pos, lpos, k, block_len, i, j, n;
195 const uint8_t *table;
197 if (s->version == 1) {
202 for (k = 0; k < s->nb_block_sizes; k++) {
203 block_len = s->frame_len >> k;
205 if (s->version == 1) {
207 for (i = 0; i < 25; i++) {
208 a = ff_wma_critical_freqs[i];
209 b = avctx->sample_rate;
210 pos = ((block_len * 2 * a) + (b >> 1)) / b;
213 s->exponent_bands[0][i] = pos - lpos;
214 if (pos >= block_len) {
220 s->exponent_sizes[0] = i;
222 /* hardcoded tables */
224 a = s->frame_len_bits - BLOCK_MIN_BITS - k;
226 if (avctx->sample_rate >= 44100) {
227 table = exponent_band_44100[a];
228 } else if (avctx->sample_rate >= 32000) {
229 table = exponent_band_32000[a];
230 } else if (avctx->sample_rate >= 22050) {
231 table = exponent_band_22050[a];
236 for (i = 0; i < n; i++)
237 s->exponent_bands[k][i] = table[i];
238 s->exponent_sizes[k] = n;
242 for (i = 0; i < 25; i++) {
243 a = ff_wma_critical_freqs[i];
244 b = avctx->sample_rate;
245 pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
250 s->exponent_bands[k][j++] = pos - lpos;
251 if (pos >= block_len)
255 s->exponent_sizes[k] = j;
259 /* max number of coefs */
260 s->coefs_end[k] = (s->frame_len - ((s->frame_len * 9) / 100)) >> k;
261 /* high freq computation */
262 s->high_band_start[k] = (int)((block_len * 2 * high_freq) /
263 avctx->sample_rate + 0.5);
264 n = s->exponent_sizes[k];
267 for (i = 0; i < n; i++) {
270 pos += s->exponent_bands[k][i];
272 if (start < s->high_band_start[k])
273 start = s->high_band_start[k];
274 if (end > s->coefs_end[k])
275 end = s->coefs_end[k];
277 s->exponent_high_bands[k][j++] = end - start;
279 s->exponent_high_sizes[k] = j;
281 tprintf(s->avctx, "%5d: coefs_end=%d high_band_start=%d nb_high_bands=%d: ",
284 s->high_band_start[k],
285 s->exponent_high_sizes[k]);
286 for (j = 0; j < s->exponent_high_sizes[k]; j++)
287 tprintf(s->avctx, " %d", s->exponent_high_bands[k][j]);
288 tprintf(s->avctx, "\n");
296 for (i = 0; i < s->nb_block_sizes; i++) {
297 tprintf(s->avctx, "%5d: n=%2d:",
299 s->exponent_sizes[i]);
300 for (j = 0; j < s->exponent_sizes[i]; j++)
301 tprintf(s->avctx, " %d", s->exponent_bands[i][j]);
302 tprintf(s->avctx, "\n");
307 /* init MDCT windows : simple sinus window */
308 for (i = 0; i < s->nb_block_sizes; i++) {
309 ff_init_ff_sine_windows(s->frame_len_bits - i);
310 s->windows[i] = ff_sine_windows[s->frame_len_bits - i];
313 s->reset_block_lengths = 1;
315 if (s->use_noise_coding) {
317 /* init the noise generator */
318 if (s->use_exp_vlc) {
319 s->noise_mult = 0.02;
321 s->noise_mult = 0.04;
325 for (i = 0; i < NOISE_TAB_SIZE; i++)
326 s->noise_table[i] = 1.0 * s->noise_mult;
332 norm = (1.0 / (float)(1LL << 31)) * sqrt(3) * s->noise_mult;
333 for (i = 0; i < NOISE_TAB_SIZE; i++) {
334 seed = seed * 314159 + 1;
335 s->noise_table[i] = (float)((int)seed) * norm;
341 /* choose the VLC tables for the coefficients */
343 if (avctx->sample_rate >= 32000) {
346 } else if (bps1 < 1.16) {
350 s->coef_vlcs[0]= &coef_vlcs[coef_vlc_table * 2 ];
351 s->coef_vlcs[1]= &coef_vlcs[coef_vlc_table * 2 + 1];
352 init_coef_vlc(&s->coef_vlc[0], &s->run_table[0], &s->level_table[0], &s->int_table[0],
354 init_coef_vlc(&s->coef_vlc[1], &s->run_table[1], &s->level_table[1], &s->int_table[1],
360 int ff_wma_total_gain_to_bits(int total_gain)
362 if (total_gain < 15) return 13;
363 else if (total_gain < 32) return 12;
364 else if (total_gain < 40) return 11;
365 else if (total_gain < 45) return 10;
369 int ff_wma_end(AVCodecContext *avctx)
371 WMACodecContext *s = avctx->priv_data;
374 for (i = 0; i < s->nb_block_sizes; i++)
375 ff_mdct_end(&s->mdct_ctx[i]);
377 if (s->use_exp_vlc) {
378 ff_free_vlc(&s->exp_vlc);
380 if (s->use_noise_coding) {
381 ff_free_vlc(&s->hgain_vlc);
383 for (i = 0; i < 2; i++) {
384 ff_free_vlc(&s->coef_vlc[i]);
385 av_free(s->run_table[i]);
386 av_free(s->level_table[i]);
387 av_free(s->int_table[i]);
394 * Decode an uncompressed coefficient.
395 * @param gb GetBitContext
396 * @return the decoded coefficient
398 unsigned int ff_wma_get_large_val(GetBitContext* gb)
400 /** 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,
433 const float *level_table, const uint16_t *run_table,
434 int version, WMACoef *ptr, int offset,
435 int num_coefs, 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");