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"
43 #define EXPMAX ((19 + EXPVLCBITS - 1) / EXPVLCBITS)
45 #define HGAINVLCBITS 9
46 #define HGAINMAX ((13 + HGAINVLCBITS - 1) / HGAINVLCBITS)
48 static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len);
51 static void dump_floats(WMACodecContext *s, const char *name,
52 int prec, const float *tab, int n)
56 ff_tlog(s->avctx, "%s[%d]:\n", name, n);
57 for (i = 0; i < n; i++) {
59 ff_tlog(s->avctx, "%4d: ", i);
60 ff_tlog(s->avctx, " %8.*f", prec, tab[i]);
62 ff_tlog(s->avctx, "\n");
65 ff_tlog(s->avctx, "\n");
69 static av_cold int wma_decode_init(AVCodecContext *avctx)
71 WMACodecContext *s = avctx->priv_data;
75 if (!avctx->block_align) {
76 av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
77 return AVERROR(EINVAL);
82 /* extract flag info */
84 extradata = avctx->extradata;
85 if (avctx->codec->id == AV_CODEC_ID_WMAV1 && avctx->extradata_size >= 4)
86 flags2 = AV_RL16(extradata + 2);
87 else if (avctx->codec->id == AV_CODEC_ID_WMAV2 && avctx->extradata_size >= 6)
88 flags2 = AV_RL16(extradata + 4);
90 s->use_exp_vlc = flags2 & 0x0001;
91 s->use_bit_reservoir = flags2 & 0x0002;
92 s->use_variable_block_len = flags2 & 0x0004;
94 if (ff_wma_init(avctx, flags2) < 0)
98 for (i = 0; i < s->nb_block_sizes; i++)
99 ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 1, 1.0 / 32768.0);
101 if (s->use_noise_coding) {
102 init_vlc(&s->hgain_vlc, HGAINVLCBITS, sizeof(ff_wma_hgain_huffbits),
103 ff_wma_hgain_huffbits, 1, 1,
104 ff_wma_hgain_huffcodes, 2, 2, 0);
108 init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(ff_aac_scalefactor_bits), // FIXME move out of context
109 ff_aac_scalefactor_bits, 1, 1,
110 ff_aac_scalefactor_code, 4, 4, 0);
112 wma_lsp_to_curve_init(s, s->frame_len);
114 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
120 * compute x^-0.25 with an exponent and mantissa table. We use linear
121 * interpolation to reduce the mantissa table size at a small speed
122 * expense (linear interpolation approximately doubles the number of
123 * bits of precision).
125 static inline float pow_m1_4(WMACodecContext *s, float x)
136 m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
137 /* build interpolation scale: 1 <= t < 2. */
138 t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
139 a = s->lsp_pow_m_table1[m];
140 b = s->lsp_pow_m_table2[m];
141 return s->lsp_pow_e_table[e] * (a + b * t.f);
144 static av_cold void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len)
149 wdel = M_PI / frame_len;
150 for (i = 0; i < frame_len; i++)
151 s->lsp_cos_table[i] = 2.0f * cos(wdel * i);
153 /* tables for x^-0.25 computation */
154 for (i = 0; i < 256; i++) {
156 s->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
159 /* NOTE: these two tables are needed to avoid two operations in
162 for (i = (1 << LSP_POW_BITS) - 1; i >= 0; i--) {
163 m = (1 << LSP_POW_BITS) + i;
164 a = (float) m * (0.5 / (1 << LSP_POW_BITS));
166 s->lsp_pow_m_table1[i] = 2 * a - b;
167 s->lsp_pow_m_table2[i] = b - a;
173 * NOTE: We use the same code as Vorbis here
174 * @todo optimize it further with SSE/3Dnow
176 static void wma_lsp_to_curve(WMACodecContext *s, float *out, float *val_max_ptr,
180 float p, q, w, v, val_max;
183 for (i = 0; i < n; i++) {
186 w = s->lsp_cos_table[i];
187 for (j = 1; j < NB_LSP_COEFS; j += 2) {
199 *val_max_ptr = val_max;
203 * decode exponents coded with LSP coefficients (same idea as Vorbis)
205 static void decode_exp_lsp(WMACodecContext *s, int ch)
207 float lsp_coefs[NB_LSP_COEFS];
210 for (i = 0; i < NB_LSP_COEFS; i++) {
211 if (i == 0 || i >= 8)
212 val = get_bits(&s->gb, 3);
214 val = get_bits(&s->gb, 4);
215 lsp_coefs[i] = ff_wma_lsp_codebook[i][val];
218 wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch],
219 s->block_len, lsp_coefs);
222 /** pow(10, i / 16.0) for i in -60..95 */
223 static const float pow_tab[] = {
224 1.7782794100389e-04, 2.0535250264571e-04,
225 2.3713737056617e-04, 2.7384196342644e-04,
226 3.1622776601684e-04, 3.6517412725484e-04,
227 4.2169650342858e-04, 4.8696752516586e-04,
228 5.6234132519035e-04, 6.4938163157621e-04,
229 7.4989420933246e-04, 8.6596432336006e-04,
230 1.0000000000000e-03, 1.1547819846895e-03,
231 1.3335214321633e-03, 1.5399265260595e-03,
232 1.7782794100389e-03, 2.0535250264571e-03,
233 2.3713737056617e-03, 2.7384196342644e-03,
234 3.1622776601684e-03, 3.6517412725484e-03,
235 4.2169650342858e-03, 4.8696752516586e-03,
236 5.6234132519035e-03, 6.4938163157621e-03,
237 7.4989420933246e-03, 8.6596432336006e-03,
238 1.0000000000000e-02, 1.1547819846895e-02,
239 1.3335214321633e-02, 1.5399265260595e-02,
240 1.7782794100389e-02, 2.0535250264571e-02,
241 2.3713737056617e-02, 2.7384196342644e-02,
242 3.1622776601684e-02, 3.6517412725484e-02,
243 4.2169650342858e-02, 4.8696752516586e-02,
244 5.6234132519035e-02, 6.4938163157621e-02,
245 7.4989420933246e-02, 8.6596432336007e-02,
246 1.0000000000000e-01, 1.1547819846895e-01,
247 1.3335214321633e-01, 1.5399265260595e-01,
248 1.7782794100389e-01, 2.0535250264571e-01,
249 2.3713737056617e-01, 2.7384196342644e-01,
250 3.1622776601684e-01, 3.6517412725484e-01,
251 4.2169650342858e-01, 4.8696752516586e-01,
252 5.6234132519035e-01, 6.4938163157621e-01,
253 7.4989420933246e-01, 8.6596432336007e-01,
254 1.0000000000000e+00, 1.1547819846895e+00,
255 1.3335214321633e+00, 1.5399265260595e+00,
256 1.7782794100389e+00, 2.0535250264571e+00,
257 2.3713737056617e+00, 2.7384196342644e+00,
258 3.1622776601684e+00, 3.6517412725484e+00,
259 4.2169650342858e+00, 4.8696752516586e+00,
260 5.6234132519035e+00, 6.4938163157621e+00,
261 7.4989420933246e+00, 8.6596432336007e+00,
262 1.0000000000000e+01, 1.1547819846895e+01,
263 1.3335214321633e+01, 1.5399265260595e+01,
264 1.7782794100389e+01, 2.0535250264571e+01,
265 2.3713737056617e+01, 2.7384196342644e+01,
266 3.1622776601684e+01, 3.6517412725484e+01,
267 4.2169650342858e+01, 4.8696752516586e+01,
268 5.6234132519035e+01, 6.4938163157621e+01,
269 7.4989420933246e+01, 8.6596432336007e+01,
270 1.0000000000000e+02, 1.1547819846895e+02,
271 1.3335214321633e+02, 1.5399265260595e+02,
272 1.7782794100389e+02, 2.0535250264571e+02,
273 2.3713737056617e+02, 2.7384196342644e+02,
274 3.1622776601684e+02, 3.6517412725484e+02,
275 4.2169650342858e+02, 4.8696752516586e+02,
276 5.6234132519035e+02, 6.4938163157621e+02,
277 7.4989420933246e+02, 8.6596432336007e+02,
278 1.0000000000000e+03, 1.1547819846895e+03,
279 1.3335214321633e+03, 1.5399265260595e+03,
280 1.7782794100389e+03, 2.0535250264571e+03,
281 2.3713737056617e+03, 2.7384196342644e+03,
282 3.1622776601684e+03, 3.6517412725484e+03,
283 4.2169650342858e+03, 4.8696752516586e+03,
284 5.6234132519035e+03, 6.4938163157621e+03,
285 7.4989420933246e+03, 8.6596432336007e+03,
286 1.0000000000000e+04, 1.1547819846895e+04,
287 1.3335214321633e+04, 1.5399265260595e+04,
288 1.7782794100389e+04, 2.0535250264571e+04,
289 2.3713737056617e+04, 2.7384196342644e+04,
290 3.1622776601684e+04, 3.6517412725484e+04,
291 4.2169650342858e+04, 4.8696752516586e+04,
292 5.6234132519035e+04, 6.4938163157621e+04,
293 7.4989420933246e+04, 8.6596432336007e+04,
294 1.0000000000000e+05, 1.1547819846895e+05,
295 1.3335214321633e+05, 1.5399265260595e+05,
296 1.7782794100389e+05, 2.0535250264571e+05,
297 2.3713737056617e+05, 2.7384196342644e+05,
298 3.1622776601684e+05, 3.6517412725484e+05,
299 4.2169650342858e+05, 4.8696752516586e+05,
300 5.6234132519035e+05, 6.4938163157621e+05,
301 7.4989420933246e+05, 8.6596432336007e+05,
305 * decode exponents coded with VLC codes
307 static int decode_exp_vlc(WMACodecContext *s, int ch)
309 int last_exp, n, code;
312 uint32_t *q, *q_end, iv;
313 const float *ptab = pow_tab + 60;
314 const uint32_t *iptab = (const uint32_t *) ptab;
316 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
317 q = (uint32_t *) s->exponents[ch];
318 q_end = q + s->block_len;
320 if (s->version == 1) {
321 last_exp = get_bits(&s->gb, 5) + 10;
323 iv = iptab[last_exp];
331 } while ((n -= 4) > 0);
336 code = get_vlc2(&s->gb, s->exp_vlc.table, EXPVLCBITS, EXPMAX);
338 av_log(s->avctx, AV_LOG_ERROR, "Exponent vlc invalid\n");
341 /* NOTE: this offset is the same as MPEG-4 AAC! */
342 last_exp += code - 60;
343 if ((unsigned) last_exp + 60 >= FF_ARRAY_ELEMS(pow_tab)) {
344 av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n",
349 iv = iptab[last_exp];
358 } while ((n -= 4) > 0);
360 s->max_exponent[ch] = max_scale;
365 * Apply MDCT window and add into output.
367 * We ensure that when the windows overlap their squared sum
368 * is always 1 (MDCT reconstruction rule).
370 static void wma_window(WMACodecContext *s, float *out)
372 float *in = s->output;
373 int block_len, bsize, n;
376 if (s->block_len_bits <= s->prev_block_len_bits) {
377 block_len = s->block_len;
378 bsize = s->frame_len_bits - s->block_len_bits;
380 s->fdsp.vector_fmul_add(out, in, s->windows[bsize],
383 block_len = 1 << s->prev_block_len_bits;
384 n = (s->block_len - block_len) / 2;
385 bsize = s->frame_len_bits - s->prev_block_len_bits;
387 s->fdsp.vector_fmul_add(out + n, in + n, s->windows[bsize],
390 memcpy(out + n + block_len, in + n + block_len, n * sizeof(float));
397 if (s->block_len_bits <= s->next_block_len_bits) {
398 block_len = s->block_len;
399 bsize = s->frame_len_bits - s->block_len_bits;
401 s->fdsp.vector_fmul_reverse(out, in, s->windows[bsize], block_len);
403 block_len = 1 << s->next_block_len_bits;
404 n = (s->block_len - block_len) / 2;
405 bsize = s->frame_len_bits - s->next_block_len_bits;
407 memcpy(out, in, n * sizeof(float));
409 s->fdsp.vector_fmul_reverse(out + n, in + n, s->windows[bsize],
412 memset(out + n + block_len, 0, n * sizeof(float));
417 * @return 0 if OK. 1 if last block of frame. return -1 if
418 * unrecoverable error.
420 static int wma_decode_block(WMACodecContext *s)
422 int n, v, a, ch, bsize;
423 int coef_nb_bits, total_gain;
424 int nb_coefs[MAX_CHANNELS];
429 ff_tlog(s->avctx, "***decode_block: %d:%d\n",
430 s->frame_count - 1, s->block_num);
433 /* compute current block length */
434 if (s->use_variable_block_len) {
435 n = av_log2(s->nb_block_sizes - 1) + 1;
437 if (s->reset_block_lengths) {
438 s->reset_block_lengths = 0;
439 v = get_bits(&s->gb, n);
440 if (v >= s->nb_block_sizes) {
441 av_log(s->avctx, AV_LOG_ERROR,
442 "prev_block_len_bits %d out of range\n",
443 s->frame_len_bits - v);
446 s->prev_block_len_bits = s->frame_len_bits - v;
447 v = get_bits(&s->gb, n);
448 if (v >= s->nb_block_sizes) {
449 av_log(s->avctx, AV_LOG_ERROR,
450 "block_len_bits %d out of range\n",
451 s->frame_len_bits - v);
454 s->block_len_bits = s->frame_len_bits - v;
456 /* update block lengths */
457 s->prev_block_len_bits = s->block_len_bits;
458 s->block_len_bits = s->next_block_len_bits;
460 v = get_bits(&s->gb, n);
461 if (v >= s->nb_block_sizes) {
462 av_log(s->avctx, AV_LOG_ERROR,
463 "next_block_len_bits %d out of range\n",
464 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);
485 for (ch = 0; ch < s->avctx->channels; ch++) {
486 a = get_bits1(&s->gb);
487 s->channel_coded[ch] = a;
491 bsize = s->frame_len_bits - s->block_len_bits;
493 /* if no channel coded, no need to go further */
494 /* XXX: fix potential framing problems */
498 /* read total gain and extract corresponding number of bits for
499 * coef escape coding */
502 a = get_bits(&s->gb, 7);
508 coef_nb_bits = ff_wma_total_gain_to_bits(total_gain);
510 /* compute number of coefficients */
511 n = s->coefs_end[bsize] - s->coefs_start;
512 for (ch = 0; ch < s->avctx->channels; ch++)
516 if (s->use_noise_coding) {
517 for (ch = 0; ch < s->avctx->channels; ch++) {
518 if (s->channel_coded[ch]) {
520 n = s->exponent_high_sizes[bsize];
521 for (i = 0; i < n; i++) {
522 a = get_bits1(&s->gb);
523 s->high_band_coded[ch][i] = a;
524 /* if noise coding, the coefficients are not transmitted */
526 nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
530 for (ch = 0; ch < s->avctx->channels; ch++) {
531 if (s->channel_coded[ch]) {
534 n = s->exponent_high_sizes[bsize];
535 val = (int) 0x80000000;
536 for (i = 0; i < n; i++) {
537 if (s->high_band_coded[ch][i]) {
538 if (val == (int) 0x80000000) {
539 val = get_bits(&s->gb, 7) - 19;
541 code = get_vlc2(&s->gb, s->hgain_vlc.table,
542 HGAINVLCBITS, HGAINMAX);
544 av_log(s->avctx, AV_LOG_ERROR,
545 "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) || get_bits1(&s->gb)) {
559 for (ch = 0; ch < s->avctx->channels; ch++) {
560 if (s->channel_coded[ch]) {
561 if (s->use_exp_vlc) {
562 if (decode_exp_vlc(s, ch) < 0)
565 decode_exp_lsp(s, ch);
567 s->exponents_bsize[ch] = bsize;
572 /* parse spectral coefficients : just RLE encoding */
573 for (ch = 0; ch < s->avctx->channels; ch++) {
574 if (s->channel_coded[ch]) {
576 WMACoef *ptr = &s->coefs1[ch][0];
578 /* special VLC tables are used for ms stereo because
579 * there is potentially less energy there */
580 tindex = (ch == 1 && s->ms_stereo);
581 memset(ptr, 0, s->block_len * sizeof(WMACoef));
582 ff_wma_run_level_decode(s->avctx, &s->gb, &s->coef_vlc[tindex],
583 s->level_table[tindex], s->run_table[tindex],
584 0, ptr, 0, nb_coefs[ch],
585 s->block_len, s->frame_len_bits, coef_nb_bits);
587 if (s->version == 1 && s->avctx->channels >= 2)
588 align_get_bits(&s->gb);
593 int n4 = s->block_len / 2;
594 mdct_norm = 1.0 / (float) n4;
596 mdct_norm *= sqrt(n4);
599 /* finally compute the MDCT coefficients */
600 for (ch = 0; ch < s->avctx->channels; ch++) {
601 if (s->channel_coded[ch]) {
603 float *coefs, *exponents, mult, mult1, noise;
604 int i, j, n, n1, last_high_band, esize;
605 float exp_power[HIGH_BAND_MAX_SIZE];
607 coefs1 = s->coefs1[ch];
608 exponents = s->exponents[ch];
609 esize = s->exponents_bsize[ch];
610 mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
612 coefs = s->coefs[ch];
613 if (s->use_noise_coding) {
615 /* very low freqs : noise */
616 for (i = 0; i < s->coefs_start; i++) {
617 *coefs++ = s->noise_table[s->noise_index] *
618 exponents[i << bsize >> esize] * mult1;
619 s->noise_index = (s->noise_index + 1) &
620 (NOISE_TAB_SIZE - 1);
623 n1 = s->exponent_high_sizes[bsize];
625 /* compute power of high bands */
626 exponents = s->exponents[ch] +
627 (s->high_band_start[bsize] << bsize >> esize);
628 last_high_band = 0; /* avoid warning */
629 for (j = 0; j < n1; j++) {
630 n = s->exponent_high_bands[s->frame_len_bits -
631 s->block_len_bits][j];
632 if (s->high_band_coded[ch][j]) {
635 for (i = 0; i < n; i++) {
636 v = exponents[i << bsize >> esize];
639 exp_power[j] = e2 / n;
641 ff_tlog(s->avctx, "%d: power=%f (%d)\n", j, exp_power[j], n);
643 exponents += n << bsize >> esize;
646 /* main freqs and high freqs */
647 exponents = s->exponents[ch] + (s->coefs_start << bsize >> esize);
648 for (j = -1; j < n1; j++) {
650 n = s->high_band_start[bsize] - s->coefs_start;
652 n = s->exponent_high_bands[s->frame_len_bits -
653 s->block_len_bits][j];
654 if (j >= 0 && s->high_band_coded[ch][j]) {
655 /* use noise with specified power */
656 mult1 = sqrt(exp_power[j] / exp_power[last_high_band]);
657 /* XXX: use a table */
658 mult1 = mult1 * pow(10, s->high_band_values[ch][j] * 0.05);
659 mult1 = mult1 / (s->max_exponent[ch] * s->noise_mult);
661 for (i = 0; i < n; i++) {
662 noise = s->noise_table[s->noise_index];
663 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
664 *coefs++ = noise * exponents[i << bsize >> esize] * mult1;
666 exponents += n << bsize >> esize;
668 /* coded values + small noise */
669 for (i = 0; i < n; i++) {
670 noise = s->noise_table[s->noise_index];
671 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
672 *coefs++ = ((*coefs1++) + noise) *
673 exponents[i << bsize >> esize] * mult;
675 exponents += n << bsize >> esize;
679 /* very high freqs : noise */
680 n = s->block_len - s->coefs_end[bsize];
681 mult1 = mult * exponents[((-1 << bsize)) >> esize];
682 for (i = 0; i < n; i++) {
683 *coefs++ = s->noise_table[s->noise_index] * mult1;
684 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
687 /* XXX: optimize more */
688 for (i = 0; i < s->coefs_start; i++)
691 for (i = 0; i < n; i++)
692 *coefs++ = coefs1[i] * exponents[i << bsize >> esize] * mult;
693 n = s->block_len - s->coefs_end[bsize];
694 for (i = 0; i < n; i++)
701 for (ch = 0; ch < s->avctx->channels; ch++) {
702 if (s->channel_coded[ch]) {
703 dump_floats(s, "exponents", 3, s->exponents[ch], s->block_len);
704 dump_floats(s, "coefs", 1, s->coefs[ch], s->block_len);
709 if (s->ms_stereo && s->channel_coded[1]) {
710 /* nominal case for ms stereo: we do it before mdct */
711 /* no need to optimize this case because it should almost
713 if (!s->channel_coded[0]) {
714 ff_tlog(s->avctx, "rare ms-stereo case happened\n");
715 memset(s->coefs[0], 0, sizeof(float) * s->block_len);
716 s->channel_coded[0] = 1;
719 s->fdsp.butterflies_float(s->coefs[0], s->coefs[1], s->block_len);
723 mdct = &s->mdct_ctx[bsize];
725 for (ch = 0; ch < s->avctx->channels; ch++) {
728 n4 = s->block_len / 2;
729 if (s->channel_coded[ch])
730 mdct->imdct_calc(mdct, s->output, s->coefs[ch]);
731 else if (!(s->ms_stereo && ch == 1))
732 memset(s->output, 0, sizeof(s->output));
734 /* multiply by the window and add in the frame */
735 index = (s->frame_len / 2) + s->block_pos - n4;
736 wma_window(s, &s->frame_out[ch][index]);
739 /* update block number */
741 s->block_pos += s->block_len;
742 if (s->block_pos >= s->frame_len)
748 /* decode a frame of frame_len samples */
749 static int wma_decode_frame(WMACodecContext *s, float **samples,
755 ff_tlog(s->avctx, "***decode_frame: %d size=%d\n",
756 s->frame_count++, s->frame_len);
759 /* read each block */
763 ret = wma_decode_block(s);
770 for (ch = 0; ch < s->avctx->channels; ch++) {
771 /* copy current block to output */
772 memcpy(samples[ch] + samples_offset, s->frame_out[ch],
773 s->frame_len * sizeof(*s->frame_out[ch]));
774 /* prepare for next block */
775 memmove(&s->frame_out[ch][0], &s->frame_out[ch][s->frame_len],
776 s->frame_len * sizeof(*s->frame_out[ch]));
779 dump_floats(s, "samples", 6, samples[ch] + samples_offset,
787 static int wma_decode_superframe(AVCodecContext *avctx, void *data,
788 int *got_frame_ptr, AVPacket *avpkt)
790 AVFrame *frame = data;
791 const uint8_t *buf = avpkt->data;
792 int buf_size = avpkt->size;
793 WMACodecContext *s = avctx->priv_data;
794 int nb_frames, bit_offset, i, pos, len, ret;
799 ff_tlog(avctx, "***decode_superframe:\n");
802 s->last_superframe_len = 0;
805 if (buf_size < avctx->block_align) {
806 av_log(avctx, AV_LOG_ERROR,
807 "Input packet size too small (%d < %d)\n",
808 buf_size, avctx->block_align);
809 return AVERROR_INVALIDDATA;
811 buf_size = avctx->block_align;
813 init_get_bits(&s->gb, buf, buf_size * 8);
815 if (s->use_bit_reservoir) {
816 /* read super frame header */
817 skip_bits(&s->gb, 4); /* super frame index */
818 nb_frames = get_bits(&s->gb, 4) - (s->last_superframe_len <= 0);
822 /* get output buffer */
823 frame->nb_samples = nb_frames * s->frame_len;
824 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
825 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
828 samples = (float **) frame->extended_data;
831 if (s->use_bit_reservoir) {
832 bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
833 if (bit_offset > get_bits_left(&s->gb)) {
834 av_log(avctx, AV_LOG_ERROR,
835 "Invalid last frame bit offset %d > buf size %d (%d)\n",
836 bit_offset, get_bits_left(&s->gb), buf_size);
840 if (s->last_superframe_len > 0) {
841 /* add bit_offset bits to last frame */
842 if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) >
843 MAX_CODED_SUPERFRAME_SIZE)
845 q = s->last_superframe + s->last_superframe_len;
848 *q++ = (get_bits) (&s->gb, 8);
852 *q++ = (get_bits) (&s->gb, len) << (8 - len);
853 memset(q, 0, AV_INPUT_BUFFER_PADDING_SIZE);
855 /* XXX: bit_offset bits into last frame */
856 init_get_bits(&s->gb, s->last_superframe,
857 s->last_superframe_len * 8 + bit_offset);
858 /* skip unused bits */
859 if (s->last_bitoffset > 0)
860 skip_bits(&s->gb, s->last_bitoffset);
861 /* this frame is stored in the last superframe and in the
863 if (wma_decode_frame(s, samples, samples_offset) < 0)
865 samples_offset += s->frame_len;
869 /* read each frame starting from bit_offset */
870 pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
871 if (pos >= MAX_CODED_SUPERFRAME_SIZE * 8 || pos > buf_size * 8)
872 return AVERROR_INVALIDDATA;
873 init_get_bits(&s->gb, buf + (pos >> 3), (buf_size - (pos >> 3)) * 8);
876 skip_bits(&s->gb, len);
878 s->reset_block_lengths = 1;
879 for (i = 0; i < nb_frames; i++) {
880 if (wma_decode_frame(s, samples, samples_offset) < 0)
882 samples_offset += s->frame_len;
885 /* we copy the end of the frame in the last frame buffer */
886 pos = get_bits_count(&s->gb) +
887 ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7);
888 s->last_bitoffset = pos & 7;
890 len = buf_size - pos;
891 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) {
892 av_log(s->avctx, AV_LOG_ERROR, "len %d invalid\n", len);
895 s->last_superframe_len = len;
896 memcpy(s->last_superframe, buf + pos, len);
898 /* single frame decode */
899 if (wma_decode_frame(s, samples, samples_offset) < 0)
901 samples_offset += s->frame_len;
904 ff_dlog(s->avctx, "%d %d %d %d outbytes:%td eaten:%d\n",
905 s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len,
906 (int8_t *) samples - (int8_t *) data, avctx->block_align);
910 return avctx->block_align;
913 /* when error, we reset the bit reservoir */
914 s->last_superframe_len = 0;
918 static av_cold void flush(AVCodecContext *avctx)
920 WMACodecContext *s = avctx->priv_data;
923 s->last_superframe_len = 0;
926 AVCodec ff_wmav1_decoder = {
928 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
929 .type = AVMEDIA_TYPE_AUDIO,
930 .id = AV_CODEC_ID_WMAV1,
931 .priv_data_size = sizeof(WMACodecContext),
932 .init = wma_decode_init,
934 .decode = wma_decode_superframe,
936 .capabilities = AV_CODEC_CAP_DR1,
937 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
938 AV_SAMPLE_FMT_NONE },
941 AVCodec ff_wmav2_decoder = {
943 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
944 .type = AVMEDIA_TYPE_AUDIO,
945 .id = AV_CODEC_ID_WMAV2,
946 .priv_data_size = sizeof(WMACodecContext),
947 .init = wma_decode_init,
949 .decode = wma_decode_superframe,
951 .capabilities = AV_CODEC_CAP_DR1,
952 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
953 AV_SAMPLE_FMT_NONE },