2 * WMA compatible decoder
3 * Copyright (c) 2002 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
24 * WMA compatible decoder.
25 * This decoder handles Microsoft Windows Media Audio data, versions 1 & 2.
26 * WMA v1 is identified by audio format 0x160 in Microsoft media files
27 * (ASF/AVI/WAV). WMA v2 is identified by audio format 0x161.
29 * To use this decoder, a calling application must supply the extra data
30 * bytes provided with the WMA data. These are the extra, codec-specific
31 * bytes at the end of a WAVEFORMATEX data structure. Transmit these bytes
32 * to the decoder using the extradata[_size] fields in AVCodecContext. There
33 * should be 4 extra bytes for v1 data and 6 extra bytes for v2 data.
36 #include "libavutil/attributes.h"
45 #define EXPMAX ((19+EXPVLCBITS-1)/EXPVLCBITS)
47 #define HGAINVLCBITS 9
48 #define HGAINMAX ((13+HGAINVLCBITS-1)/HGAINVLCBITS)
50 static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len);
53 static void dump_floats(WMACodecContext *s, const char *name, int prec, const float *tab, int n)
57 tprintf(s->avctx, "%s[%d]:\n", name, n);
60 tprintf(s->avctx, "%4d: ", i);
61 tprintf(s->avctx, " %8.*f", prec, tab[i]);
63 tprintf(s->avctx, "\n");
66 tprintf(s->avctx, "\n");
70 static av_cold int wma_decode_init(AVCodecContext * avctx)
72 WMACodecContext *s = avctx->priv_data;
76 if (!avctx->block_align) {
77 av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
78 return AVERROR(EINVAL);
83 /* extract flag infos */
85 extradata = avctx->extradata;
86 if (avctx->codec->id == AV_CODEC_ID_WMAV1 && avctx->extradata_size >= 4) {
87 flags2 = AV_RL16(extradata+2);
88 } else if (avctx->codec->id == AV_CODEC_ID_WMAV2 && avctx->extradata_size >= 6) {
89 flags2 = AV_RL16(extradata+4);
92 s->use_exp_vlc = flags2 & 0x0001;
93 s->use_bit_reservoir = flags2 & 0x0002;
94 s->use_variable_block_len = flags2 & 0x0004;
96 if(ff_wma_init(avctx, flags2)<0)
100 for(i = 0; i < s->nb_block_sizes; i++)
101 ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 1, 1.0 / 32768.0);
103 if (s->use_noise_coding) {
104 init_vlc(&s->hgain_vlc, HGAINVLCBITS, sizeof(ff_wma_hgain_huffbits),
105 ff_wma_hgain_huffbits, 1, 1,
106 ff_wma_hgain_huffcodes, 2, 2, 0);
109 if (s->use_exp_vlc) {
110 init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(ff_aac_scalefactor_bits), //FIXME move out of context
111 ff_aac_scalefactor_bits, 1, 1,
112 ff_aac_scalefactor_code, 4, 4, 0);
114 wma_lsp_to_curve_init(s, s->frame_len);
117 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
123 * compute x^-0.25 with an exponent and mantissa table. We use linear
124 * interpolation to reduce the mantissa table size at a small speed
125 * expense (linear interpolation approximately doubles the number of
126 * bits of precision).
128 static inline float pow_m1_4(WMACodecContext *s, float x)
139 m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
140 /* build interpolation scale: 1 <= t < 2. */
141 t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
142 a = s->lsp_pow_m_table1[m];
143 b = s->lsp_pow_m_table2[m];
144 return s->lsp_pow_e_table[e] * (a + b * t.f);
147 static av_cold void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len)
152 wdel = M_PI / frame_len;
153 for(i=0;i<frame_len;i++)
154 s->lsp_cos_table[i] = 2.0f * cos(wdel * i);
156 /* tables for x^-0.25 computation */
159 s->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
162 /* NOTE: these two tables are needed to avoid two operations in
165 for(i=(1 << LSP_POW_BITS) - 1;i>=0;i--) {
166 m = (1 << LSP_POW_BITS) + i;
167 a = (float)m * (0.5 / (1 << LSP_POW_BITS));
169 s->lsp_pow_m_table1[i] = 2 * a - b;
170 s->lsp_pow_m_table2[i] = b - a;
176 * NOTE: We use the same code as Vorbis here
177 * @todo optimize it further with SSE/3Dnow
179 static void wma_lsp_to_curve(WMACodecContext *s,
180 float *out, float *val_max_ptr,
184 float p, q, w, v, val_max;
190 w = s->lsp_cos_table[i];
191 for(j=1;j<NB_LSP_COEFS;j+=2){
203 *val_max_ptr = val_max;
207 * decode exponents coded with LSP coefficients (same idea as Vorbis)
209 static void decode_exp_lsp(WMACodecContext *s, int ch)
211 float lsp_coefs[NB_LSP_COEFS];
214 for(i = 0; i < NB_LSP_COEFS; i++) {
215 if (i == 0 || i >= 8)
216 val = get_bits(&s->gb, 3);
218 val = get_bits(&s->gb, 4);
219 lsp_coefs[i] = ff_wma_lsp_codebook[i][val];
222 wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch],
223 s->block_len, lsp_coefs);
226 /** pow(10, i / 16.0) for i in -60..95 */
227 static const float pow_tab[] = {
228 1.7782794100389e-04, 2.0535250264571e-04,
229 2.3713737056617e-04, 2.7384196342644e-04,
230 3.1622776601684e-04, 3.6517412725484e-04,
231 4.2169650342858e-04, 4.8696752516586e-04,
232 5.6234132519035e-04, 6.4938163157621e-04,
233 7.4989420933246e-04, 8.6596432336006e-04,
234 1.0000000000000e-03, 1.1547819846895e-03,
235 1.3335214321633e-03, 1.5399265260595e-03,
236 1.7782794100389e-03, 2.0535250264571e-03,
237 2.3713737056617e-03, 2.7384196342644e-03,
238 3.1622776601684e-03, 3.6517412725484e-03,
239 4.2169650342858e-03, 4.8696752516586e-03,
240 5.6234132519035e-03, 6.4938163157621e-03,
241 7.4989420933246e-03, 8.6596432336006e-03,
242 1.0000000000000e-02, 1.1547819846895e-02,
243 1.3335214321633e-02, 1.5399265260595e-02,
244 1.7782794100389e-02, 2.0535250264571e-02,
245 2.3713737056617e-02, 2.7384196342644e-02,
246 3.1622776601684e-02, 3.6517412725484e-02,
247 4.2169650342858e-02, 4.8696752516586e-02,
248 5.6234132519035e-02, 6.4938163157621e-02,
249 7.4989420933246e-02, 8.6596432336007e-02,
250 1.0000000000000e-01, 1.1547819846895e-01,
251 1.3335214321633e-01, 1.5399265260595e-01,
252 1.7782794100389e-01, 2.0535250264571e-01,
253 2.3713737056617e-01, 2.7384196342644e-01,
254 3.1622776601684e-01, 3.6517412725484e-01,
255 4.2169650342858e-01, 4.8696752516586e-01,
256 5.6234132519035e-01, 6.4938163157621e-01,
257 7.4989420933246e-01, 8.6596432336007e-01,
258 1.0000000000000e+00, 1.1547819846895e+00,
259 1.3335214321633e+00, 1.5399265260595e+00,
260 1.7782794100389e+00, 2.0535250264571e+00,
261 2.3713737056617e+00, 2.7384196342644e+00,
262 3.1622776601684e+00, 3.6517412725484e+00,
263 4.2169650342858e+00, 4.8696752516586e+00,
264 5.6234132519035e+00, 6.4938163157621e+00,
265 7.4989420933246e+00, 8.6596432336007e+00,
266 1.0000000000000e+01, 1.1547819846895e+01,
267 1.3335214321633e+01, 1.5399265260595e+01,
268 1.7782794100389e+01, 2.0535250264571e+01,
269 2.3713737056617e+01, 2.7384196342644e+01,
270 3.1622776601684e+01, 3.6517412725484e+01,
271 4.2169650342858e+01, 4.8696752516586e+01,
272 5.6234132519035e+01, 6.4938163157621e+01,
273 7.4989420933246e+01, 8.6596432336007e+01,
274 1.0000000000000e+02, 1.1547819846895e+02,
275 1.3335214321633e+02, 1.5399265260595e+02,
276 1.7782794100389e+02, 2.0535250264571e+02,
277 2.3713737056617e+02, 2.7384196342644e+02,
278 3.1622776601684e+02, 3.6517412725484e+02,
279 4.2169650342858e+02, 4.8696752516586e+02,
280 5.6234132519035e+02, 6.4938163157621e+02,
281 7.4989420933246e+02, 8.6596432336007e+02,
282 1.0000000000000e+03, 1.1547819846895e+03,
283 1.3335214321633e+03, 1.5399265260595e+03,
284 1.7782794100389e+03, 2.0535250264571e+03,
285 2.3713737056617e+03, 2.7384196342644e+03,
286 3.1622776601684e+03, 3.6517412725484e+03,
287 4.2169650342858e+03, 4.8696752516586e+03,
288 5.6234132519035e+03, 6.4938163157621e+03,
289 7.4989420933246e+03, 8.6596432336007e+03,
290 1.0000000000000e+04, 1.1547819846895e+04,
291 1.3335214321633e+04, 1.5399265260595e+04,
292 1.7782794100389e+04, 2.0535250264571e+04,
293 2.3713737056617e+04, 2.7384196342644e+04,
294 3.1622776601684e+04, 3.6517412725484e+04,
295 4.2169650342858e+04, 4.8696752516586e+04,
296 5.6234132519035e+04, 6.4938163157621e+04,
297 7.4989420933246e+04, 8.6596432336007e+04,
298 1.0000000000000e+05, 1.1547819846895e+05,
299 1.3335214321633e+05, 1.5399265260595e+05,
300 1.7782794100389e+05, 2.0535250264571e+05,
301 2.3713737056617e+05, 2.7384196342644e+05,
302 3.1622776601684e+05, 3.6517412725484e+05,
303 4.2169650342858e+05, 4.8696752516586e+05,
304 5.6234132519035e+05, 6.4938163157621e+05,
305 7.4989420933246e+05, 8.6596432336007e+05,
309 * decode exponents coded with VLC codes
311 static int decode_exp_vlc(WMACodecContext *s, int ch)
313 int last_exp, n, code;
316 uint32_t *q, *q_end, iv;
317 const float *ptab = pow_tab + 60;
318 const uint32_t *iptab = (const uint32_t*)ptab;
320 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
321 q = (uint32_t *)s->exponents[ch];
322 q_end = q + s->block_len;
324 if (s->version == 1) {
325 last_exp = get_bits(&s->gb, 5) + 10;
327 iv = iptab[last_exp];
335 } while ((n -= 4) > 0);
340 code = get_vlc2(&s->gb, s->exp_vlc.table, EXPVLCBITS, EXPMAX);
342 av_log(s->avctx, AV_LOG_ERROR, "Exponent vlc invalid\n");
345 /* NOTE: this offset is the same as MPEG4 AAC ! */
346 last_exp += code - 60;
347 if ((unsigned)last_exp + 60 >= FF_ARRAY_ELEMS(pow_tab)) {
348 av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n",
353 iv = iptab[last_exp];
362 } while ((n -= 4) > 0);
364 s->max_exponent[ch] = max_scale;
370 * Apply MDCT window and add into output.
372 * We ensure that when the windows overlap their squared sum
373 * is always 1 (MDCT reconstruction rule).
375 static void wma_window(WMACodecContext *s, float *out)
377 float *in = s->output;
378 int block_len, bsize, n;
381 if (s->block_len_bits <= s->prev_block_len_bits) {
382 block_len = s->block_len;
383 bsize = s->frame_len_bits - s->block_len_bits;
385 s->fdsp.vector_fmul_add(out, in, s->windows[bsize],
389 block_len = 1 << s->prev_block_len_bits;
390 n = (s->block_len - block_len) / 2;
391 bsize = s->frame_len_bits - s->prev_block_len_bits;
393 s->fdsp.vector_fmul_add(out+n, in+n, s->windows[bsize],
396 memcpy(out+n+block_len, in+n+block_len, n*sizeof(float));
403 if (s->block_len_bits <= s->next_block_len_bits) {
404 block_len = s->block_len;
405 bsize = s->frame_len_bits - s->block_len_bits;
407 s->fdsp.vector_fmul_reverse(out, in, s->windows[bsize], block_len);
410 block_len = 1 << s->next_block_len_bits;
411 n = (s->block_len - block_len) / 2;
412 bsize = s->frame_len_bits - s->next_block_len_bits;
414 memcpy(out, in, n*sizeof(float));
416 s->fdsp.vector_fmul_reverse(out+n, in+n, s->windows[bsize], block_len);
418 memset(out+n+block_len, 0, n*sizeof(float));
424 * @return 0 if OK. 1 if last block of frame. return -1 if
425 * unrecorrable error.
427 static int wma_decode_block(WMACodecContext *s)
429 int n, v, a, ch, bsize;
430 int coef_nb_bits, total_gain;
431 int nb_coefs[MAX_CHANNELS];
436 tprintf(s->avctx, "***decode_block: %d:%d\n", s->frame_count - 1, s->block_num);
439 /* compute current block length */
440 if (s->use_variable_block_len) {
441 n = av_log2(s->nb_block_sizes - 1) + 1;
443 if (s->reset_block_lengths) {
444 s->reset_block_lengths = 0;
445 v = get_bits(&s->gb, n);
446 if (v >= s->nb_block_sizes){
447 av_log(s->avctx, AV_LOG_ERROR, "prev_block_len_bits %d out of range\n", s->frame_len_bits - v);
450 s->prev_block_len_bits = s->frame_len_bits - v;
451 v = get_bits(&s->gb, n);
452 if (v >= s->nb_block_sizes){
453 av_log(s->avctx, AV_LOG_ERROR, "block_len_bits %d out of range\n", s->frame_len_bits - v);
456 s->block_len_bits = s->frame_len_bits - v;
458 /* update block lengths */
459 s->prev_block_len_bits = s->block_len_bits;
460 s->block_len_bits = s->next_block_len_bits;
462 v = get_bits(&s->gb, n);
463 if (v >= s->nb_block_sizes){
464 av_log(s->avctx, AV_LOG_ERROR, "next_block_len_bits %d out of range\n", s->frame_len_bits - v);
467 s->next_block_len_bits = s->frame_len_bits - v;
469 /* fixed block len */
470 s->next_block_len_bits = s->frame_len_bits;
471 s->prev_block_len_bits = s->frame_len_bits;
472 s->block_len_bits = s->frame_len_bits;
475 /* now check if the block length is coherent with the frame length */
476 s->block_len = 1 << s->block_len_bits;
477 if ((s->block_pos + s->block_len) > s->frame_len){
478 av_log(s->avctx, AV_LOG_ERROR, "frame_len overflow\n");
482 if (s->avctx->channels == 2) {
483 s->ms_stereo = get_bits1(&s->gb);
486 for(ch = 0; ch < s->avctx->channels; ch++) {
487 a = get_bits1(&s->gb);
488 s->channel_coded[ch] = a;
492 bsize = s->frame_len_bits - s->block_len_bits;
494 /* if no channel coded, no need to go further */
495 /* XXX: fix potential framing problems */
499 /* read total gain and extract corresponding number of bits for
500 coef escape coding */
503 a = get_bits(&s->gb, 7);
509 coef_nb_bits= ff_wma_total_gain_to_bits(total_gain);
511 /* compute number of coefficients */
512 n = s->coefs_end[bsize] - s->coefs_start;
513 for(ch = 0; ch < s->avctx->channels; ch++)
517 if (s->use_noise_coding) {
519 for(ch = 0; ch < s->avctx->channels; ch++) {
520 if (s->channel_coded[ch]) {
522 n = s->exponent_high_sizes[bsize];
524 a = get_bits1(&s->gb);
525 s->high_band_coded[ch][i] = a;
526 /* if noise coding, the coefficients are not transmitted */
528 nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
532 for(ch = 0; ch < s->avctx->channels; ch++) {
533 if (s->channel_coded[ch]) {
536 n = s->exponent_high_sizes[bsize];
537 val = (int)0x80000000;
539 if (s->high_band_coded[ch][i]) {
540 if (val == (int)0x80000000) {
541 val = get_bits(&s->gb, 7) - 19;
543 code = get_vlc2(&s->gb, s->hgain_vlc.table, HGAINVLCBITS, HGAINMAX);
545 av_log(s->avctx, AV_LOG_ERROR, "hgain vlc invalid\n");
550 s->high_band_values[ch][i] = val;
557 /* exponents can be reused in short blocks. */
558 if ((s->block_len_bits == s->frame_len_bits) ||
560 for(ch = 0; ch < s->avctx->channels; ch++) {
561 if (s->channel_coded[ch]) {
562 if (s->use_exp_vlc) {
563 if (decode_exp_vlc(s, ch) < 0)
566 decode_exp_lsp(s, ch);
568 s->exponents_bsize[ch] = bsize;
573 /* parse spectral coefficients : just RLE encoding */
574 for (ch = 0; ch < s->avctx->channels; ch++) {
575 if (s->channel_coded[ch]) {
577 WMACoef* ptr = &s->coefs1[ch][0];
579 /* special VLC tables are used for ms stereo because
580 there is potentially less energy there */
581 tindex = (ch == 1 && s->ms_stereo);
582 memset(ptr, 0, s->block_len * sizeof(WMACoef));
583 ff_wma_run_level_decode(s->avctx, &s->gb, &s->coef_vlc[tindex],
584 s->level_table[tindex], s->run_table[tindex],
585 0, ptr, 0, nb_coefs[ch],
586 s->block_len, s->frame_len_bits, coef_nb_bits);
588 if (s->version == 1 && s->avctx->channels >= 2) {
589 align_get_bits(&s->gb);
595 int n4 = s->block_len / 2;
596 mdct_norm = 1.0 / (float)n4;
597 if (s->version == 1) {
598 mdct_norm *= sqrt(n4);
602 /* finally compute the MDCT coefficients */
603 for (ch = 0; ch < s->avctx->channels; ch++) {
604 if (s->channel_coded[ch]) {
606 float *coefs, *exponents, mult, mult1, noise;
607 int i, j, n, n1, last_high_band, esize;
608 float exp_power[HIGH_BAND_MAX_SIZE];
610 coefs1 = s->coefs1[ch];
611 exponents = s->exponents[ch];
612 esize = s->exponents_bsize[ch];
613 mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
615 coefs = s->coefs[ch];
616 if (s->use_noise_coding) {
618 /* very low freqs : noise */
619 for(i = 0;i < s->coefs_start; i++) {
620 *coefs++ = s->noise_table[s->noise_index] *
621 exponents[i<<bsize>>esize] * mult1;
622 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
625 n1 = s->exponent_high_sizes[bsize];
627 /* compute power of high bands */
628 exponents = s->exponents[ch] +
629 (s->high_band_start[bsize]<<bsize>>esize);
630 last_high_band = 0; /* avoid warning */
632 n = s->exponent_high_bands[s->frame_len_bits -
633 s->block_len_bits][j];
634 if (s->high_band_coded[ch][j]) {
637 for(i = 0;i < n; i++) {
638 v = exponents[i<<bsize>>esize];
641 exp_power[j] = e2 / n;
643 tprintf(s->avctx, "%d: power=%f (%d)\n", j, exp_power[j], n);
645 exponents += n<<bsize>>esize;
648 /* main freqs and high freqs */
649 exponents = s->exponents[ch] + (s->coefs_start<<bsize>>esize);
652 n = s->high_band_start[bsize] -
655 n = s->exponent_high_bands[s->frame_len_bits -
656 s->block_len_bits][j];
658 if (j >= 0 && s->high_band_coded[ch][j]) {
659 /* use noise with specified power */
660 mult1 = sqrt(exp_power[j] / exp_power[last_high_band]);
661 /* XXX: use a table */
662 mult1 = mult1 * pow(10, s->high_band_values[ch][j] * 0.05);
663 mult1 = mult1 / (s->max_exponent[ch] * s->noise_mult);
665 for(i = 0;i < n; i++) {
666 noise = s->noise_table[s->noise_index];
667 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
669 exponents[i<<bsize>>esize] * mult1;
671 exponents += n<<bsize>>esize;
673 /* coded values + small noise */
674 for(i = 0;i < n; i++) {
675 noise = s->noise_table[s->noise_index];
676 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
677 *coefs++ = ((*coefs1++) + noise) *
678 exponents[i<<bsize>>esize] * mult;
680 exponents += n<<bsize>>esize;
684 /* very high freqs : noise */
685 n = s->block_len - s->coefs_end[bsize];
686 mult1 = mult * exponents[((-1<<bsize))>>esize];
687 for(i = 0; i < n; i++) {
688 *coefs++ = s->noise_table[s->noise_index] * mult1;
689 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
692 /* XXX: optimize more */
693 for(i = 0;i < s->coefs_start; i++)
696 for(i = 0;i < n; i++) {
697 *coefs++ = coefs1[i] * exponents[i<<bsize>>esize] * mult;
699 n = s->block_len - s->coefs_end[bsize];
700 for(i = 0;i < n; i++)
707 for (ch = 0; ch < s->avctx->channels; ch++) {
708 if (s->channel_coded[ch]) {
709 dump_floats(s, "exponents", 3, s->exponents[ch], s->block_len);
710 dump_floats(s, "coefs", 1, s->coefs[ch], s->block_len);
715 if (s->ms_stereo && s->channel_coded[1]) {
716 /* nominal case for ms stereo: we do it before mdct */
717 /* no need to optimize this case because it should almost
719 if (!s->channel_coded[0]) {
720 tprintf(s->avctx, "rare ms-stereo case happened\n");
721 memset(s->coefs[0], 0, sizeof(float) * s->block_len);
722 s->channel_coded[0] = 1;
725 s->fdsp.butterflies_float(s->coefs[0], s->coefs[1], s->block_len);
729 mdct = &s->mdct_ctx[bsize];
731 for (ch = 0; ch < s->avctx->channels; ch++) {
734 n4 = s->block_len / 2;
735 if(s->channel_coded[ch]){
736 mdct->imdct_calc(mdct, s->output, s->coefs[ch]);
737 }else if(!(s->ms_stereo && ch==1))
738 memset(s->output, 0, sizeof(s->output));
740 /* multiply by the window and add in the frame */
741 index = (s->frame_len / 2) + s->block_pos - n4;
742 wma_window(s, &s->frame_out[ch][index]);
745 /* update block number */
747 s->block_pos += s->block_len;
748 if (s->block_pos >= s->frame_len)
754 /* decode a frame of frame_len samples */
755 static int wma_decode_frame(WMACodecContext *s, float **samples,
761 tprintf(s->avctx, "***decode_frame: %d size=%d\n", s->frame_count++, s->frame_len);
764 /* read each block */
768 ret = wma_decode_block(s);
775 for (ch = 0; ch < s->avctx->channels; ch++) {
776 /* copy current block to output */
777 memcpy(samples[ch] + samples_offset, s->frame_out[ch],
778 s->frame_len * sizeof(*s->frame_out[ch]));
779 /* prepare for next block */
780 memmove(&s->frame_out[ch][0], &s->frame_out[ch][s->frame_len],
781 s->frame_len * sizeof(*s->frame_out[ch]));
784 dump_floats(s, "samples", 6, samples[ch] + samples_offset, s->frame_len);
791 static int wma_decode_superframe(AVCodecContext *avctx, void *data,
792 int *got_frame_ptr, AVPacket *avpkt)
794 AVFrame *frame = data;
795 const uint8_t *buf = avpkt->data;
796 int buf_size = avpkt->size;
797 WMACodecContext *s = avctx->priv_data;
798 int nb_frames, bit_offset, i, pos, len, ret;
803 tprintf(avctx, "***decode_superframe:\n");
806 s->last_superframe_len = 0;
809 if (buf_size < avctx->block_align) {
810 av_log(avctx, AV_LOG_ERROR,
811 "Input packet size too small (%d < %d)\n",
812 buf_size, avctx->block_align);
813 return AVERROR_INVALIDDATA;
815 buf_size = avctx->block_align;
817 init_get_bits(&s->gb, buf, buf_size*8);
819 if (s->use_bit_reservoir) {
820 /* read super frame header */
821 skip_bits(&s->gb, 4); /* super frame index */
822 nb_frames = get_bits(&s->gb, 4) - (s->last_superframe_len <= 0);
827 /* get output buffer */
828 frame->nb_samples = nb_frames * s->frame_len;
829 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
830 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
833 samples = (float **)frame->extended_data;
836 if (s->use_bit_reservoir) {
837 bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
838 if (bit_offset > get_bits_left(&s->gb)) {
839 av_log(avctx, AV_LOG_ERROR,
840 "Invalid last frame bit offset %d > buf size %d (%d)\n",
841 bit_offset, get_bits_left(&s->gb), buf_size);
845 if (s->last_superframe_len > 0) {
846 /* add bit_offset bits to last frame */
847 if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) >
848 MAX_CODED_SUPERFRAME_SIZE)
850 q = s->last_superframe + s->last_superframe_len;
853 *q++ = (get_bits)(&s->gb, 8);
857 *q++ = (get_bits)(&s->gb, len) << (8 - len);
859 memset(q, 0, FF_INPUT_BUFFER_PADDING_SIZE);
861 /* XXX: bit_offset bits into last frame */
862 init_get_bits(&s->gb, s->last_superframe, s->last_superframe_len * 8 + bit_offset);
863 /* skip unused bits */
864 if (s->last_bitoffset > 0)
865 skip_bits(&s->gb, s->last_bitoffset);
866 /* this frame is stored in the last superframe and in the
868 if (wma_decode_frame(s, samples, samples_offset) < 0)
870 samples_offset += s->frame_len;
874 /* read each frame starting from bit_offset */
875 pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
876 if (pos >= MAX_CODED_SUPERFRAME_SIZE * 8 || pos > buf_size * 8)
877 return AVERROR_INVALIDDATA;
878 init_get_bits(&s->gb, buf + (pos >> 3), (buf_size - (pos >> 3))*8);
881 skip_bits(&s->gb, len);
883 s->reset_block_lengths = 1;
884 for(i=0;i<nb_frames;i++) {
885 if (wma_decode_frame(s, samples, samples_offset) < 0)
887 samples_offset += s->frame_len;
890 /* we copy the end of the frame in the last frame buffer */
891 pos = get_bits_count(&s->gb) + ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7);
892 s->last_bitoffset = pos & 7;
894 len = buf_size - pos;
895 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) {
896 av_log(s->avctx, AV_LOG_ERROR, "len %d invalid\n", len);
899 s->last_superframe_len = len;
900 memcpy(s->last_superframe, buf + pos, len);
902 /* single frame decode */
903 if (wma_decode_frame(s, samples, samples_offset) < 0)
905 samples_offset += s->frame_len;
908 av_dlog(s->avctx, "%d %d %d %d outbytes:%td eaten:%d\n",
909 s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len,
910 (int8_t *)samples - (int8_t *)data, avctx->block_align);
914 return avctx->block_align;
916 /* when error, we reset the bit reservoir */
917 s->last_superframe_len = 0;
921 static av_cold void flush(AVCodecContext *avctx)
923 WMACodecContext *s = avctx->priv_data;
926 s->last_superframe_len= 0;
929 AVCodec ff_wmav1_decoder = {
931 .type = AVMEDIA_TYPE_AUDIO,
932 .id = AV_CODEC_ID_WMAV1,
933 .priv_data_size = sizeof(WMACodecContext),
934 .init = wma_decode_init,
936 .decode = wma_decode_superframe,
938 .capabilities = CODEC_CAP_DR1,
939 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
940 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
941 AV_SAMPLE_FMT_NONE },
944 AVCodec ff_wmav2_decoder = {
946 .type = AVMEDIA_TYPE_AUDIO,
947 .id = AV_CODEC_ID_WMAV2,
948 .priv_data_size = sizeof(WMACodecContext),
949 .init = wma_decode_init,
951 .decode = wma_decode_superframe,
953 .capabilities = CODEC_CAP_DR1,
954 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
955 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
956 AV_SAMPLE_FMT_NONE },