2 * WMA compatible decoder
3 * Copyright (c) 2002 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
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 infos */
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 (avctx->codec->id == AV_CODEC_ID_WMAV2 && avctx->extradata_size >= 8){
95 if (AV_RL16(extradata+4)==0xd && s->use_variable_block_len){
96 av_log(avctx, AV_LOG_WARNING, "Disabling use_variable_block_len, if this fails contact the ffmpeg developers and send us the file\n");
97 s->use_variable_block_len= 0; // this fixes issue1503
101 for (i=0; i<MAX_CHANNELS; i++)
102 s->max_exponent[i] = 1.0;
104 if (ff_wma_init(avctx, flags2) < 0)
108 for (i = 0; i < s->nb_block_sizes; i++)
109 ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 1, 1.0 / 32768.0);
111 if (s->use_noise_coding) {
112 init_vlc(&s->hgain_vlc, HGAINVLCBITS, sizeof(ff_wma_hgain_huffbits),
113 ff_wma_hgain_huffbits, 1, 1,
114 ff_wma_hgain_huffcodes, 2, 2, 0);
118 init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(ff_aac_scalefactor_bits), // FIXME move out of context
119 ff_aac_scalefactor_bits, 1, 1,
120 ff_aac_scalefactor_code, 4, 4, 0);
122 wma_lsp_to_curve_init(s, s->frame_len);
124 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
130 * compute x^-0.25 with an exponent and mantissa table. We use linear
131 * interpolation to reduce the mantissa table size at a small speed
132 * expense (linear interpolation approximately doubles the number of
133 * bits of precision).
135 static inline float pow_m1_4(WMACodecContext *s, float x)
146 m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
147 /* build interpolation scale: 1 <= t < 2. */
148 t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
149 a = s->lsp_pow_m_table1[m];
150 b = s->lsp_pow_m_table2[m];
151 return s->lsp_pow_e_table[e] * (a + b * t.f);
154 static av_cold void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len)
159 wdel = M_PI / frame_len;
160 for (i = 0; i < frame_len; i++)
161 s->lsp_cos_table[i] = 2.0f * cos(wdel * i);
163 /* tables for x^-0.25 computation */
164 for (i = 0; i < 256; i++) {
166 s->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
169 /* NOTE: these two tables are needed to avoid two operations in
172 for (i = (1 << LSP_POW_BITS) - 1; i >= 0; i--) {
173 m = (1 << LSP_POW_BITS) + i;
174 a = (float) m * (0.5 / (1 << LSP_POW_BITS));
176 s->lsp_pow_m_table1[i] = 2 * a - b;
177 s->lsp_pow_m_table2[i] = b - a;
183 * NOTE: We use the same code as Vorbis here
184 * @todo optimize it further with SSE/3Dnow
186 static void wma_lsp_to_curve(WMACodecContext *s, float *out, float *val_max_ptr,
190 float p, q, w, v, val_max;
193 for (i = 0; i < n; i++) {
196 w = s->lsp_cos_table[i];
197 for (j = 1; j < NB_LSP_COEFS; j += 2) {
209 *val_max_ptr = val_max;
213 * decode exponents coded with LSP coefficients (same idea as Vorbis)
215 static void decode_exp_lsp(WMACodecContext *s, int ch)
217 float lsp_coefs[NB_LSP_COEFS];
220 for (i = 0; i < NB_LSP_COEFS; i++) {
221 if (i == 0 || i >= 8)
222 val = get_bits(&s->gb, 3);
224 val = get_bits(&s->gb, 4);
225 lsp_coefs[i] = ff_wma_lsp_codebook[i][val];
228 wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch],
229 s->block_len, lsp_coefs);
232 /** pow(10, i / 16.0) for i in -60..95 */
233 static const float pow_tab[] = {
234 1.7782794100389e-04, 2.0535250264571e-04,
235 2.3713737056617e-04, 2.7384196342644e-04,
236 3.1622776601684e-04, 3.6517412725484e-04,
237 4.2169650342858e-04, 4.8696752516586e-04,
238 5.6234132519035e-04, 6.4938163157621e-04,
239 7.4989420933246e-04, 8.6596432336006e-04,
240 1.0000000000000e-03, 1.1547819846895e-03,
241 1.3335214321633e-03, 1.5399265260595e-03,
242 1.7782794100389e-03, 2.0535250264571e-03,
243 2.3713737056617e-03, 2.7384196342644e-03,
244 3.1622776601684e-03, 3.6517412725484e-03,
245 4.2169650342858e-03, 4.8696752516586e-03,
246 5.6234132519035e-03, 6.4938163157621e-03,
247 7.4989420933246e-03, 8.6596432336006e-03,
248 1.0000000000000e-02, 1.1547819846895e-02,
249 1.3335214321633e-02, 1.5399265260595e-02,
250 1.7782794100389e-02, 2.0535250264571e-02,
251 2.3713737056617e-02, 2.7384196342644e-02,
252 3.1622776601684e-02, 3.6517412725484e-02,
253 4.2169650342858e-02, 4.8696752516586e-02,
254 5.6234132519035e-02, 6.4938163157621e-02,
255 7.4989420933246e-02, 8.6596432336007e-02,
256 1.0000000000000e-01, 1.1547819846895e-01,
257 1.3335214321633e-01, 1.5399265260595e-01,
258 1.7782794100389e-01, 2.0535250264571e-01,
259 2.3713737056617e-01, 2.7384196342644e-01,
260 3.1622776601684e-01, 3.6517412725484e-01,
261 4.2169650342858e-01, 4.8696752516586e-01,
262 5.6234132519035e-01, 6.4938163157621e-01,
263 7.4989420933246e-01, 8.6596432336007e-01,
264 1.0000000000000e+00, 1.1547819846895e+00,
265 1.3335214321633e+00, 1.5399265260595e+00,
266 1.7782794100389e+00, 2.0535250264571e+00,
267 2.3713737056617e+00, 2.7384196342644e+00,
268 3.1622776601684e+00, 3.6517412725484e+00,
269 4.2169650342858e+00, 4.8696752516586e+00,
270 5.6234132519035e+00, 6.4938163157621e+00,
271 7.4989420933246e+00, 8.6596432336007e+00,
272 1.0000000000000e+01, 1.1547819846895e+01,
273 1.3335214321633e+01, 1.5399265260595e+01,
274 1.7782794100389e+01, 2.0535250264571e+01,
275 2.3713737056617e+01, 2.7384196342644e+01,
276 3.1622776601684e+01, 3.6517412725484e+01,
277 4.2169650342858e+01, 4.8696752516586e+01,
278 5.6234132519035e+01, 6.4938163157621e+01,
279 7.4989420933246e+01, 8.6596432336007e+01,
280 1.0000000000000e+02, 1.1547819846895e+02,
281 1.3335214321633e+02, 1.5399265260595e+02,
282 1.7782794100389e+02, 2.0535250264571e+02,
283 2.3713737056617e+02, 2.7384196342644e+02,
284 3.1622776601684e+02, 3.6517412725484e+02,
285 4.2169650342858e+02, 4.8696752516586e+02,
286 5.6234132519035e+02, 6.4938163157621e+02,
287 7.4989420933246e+02, 8.6596432336007e+02,
288 1.0000000000000e+03, 1.1547819846895e+03,
289 1.3335214321633e+03, 1.5399265260595e+03,
290 1.7782794100389e+03, 2.0535250264571e+03,
291 2.3713737056617e+03, 2.7384196342644e+03,
292 3.1622776601684e+03, 3.6517412725484e+03,
293 4.2169650342858e+03, 4.8696752516586e+03,
294 5.6234132519035e+03, 6.4938163157621e+03,
295 7.4989420933246e+03, 8.6596432336007e+03,
296 1.0000000000000e+04, 1.1547819846895e+04,
297 1.3335214321633e+04, 1.5399265260595e+04,
298 1.7782794100389e+04, 2.0535250264571e+04,
299 2.3713737056617e+04, 2.7384196342644e+04,
300 3.1622776601684e+04, 3.6517412725484e+04,
301 4.2169650342858e+04, 4.8696752516586e+04,
302 5.6234132519035e+04, 6.4938163157621e+04,
303 7.4989420933246e+04, 8.6596432336007e+04,
304 1.0000000000000e+05, 1.1547819846895e+05,
305 1.3335214321633e+05, 1.5399265260595e+05,
306 1.7782794100389e+05, 2.0535250264571e+05,
307 2.3713737056617e+05, 2.7384196342644e+05,
308 3.1622776601684e+05, 3.6517412725484e+05,
309 4.2169650342858e+05, 4.8696752516586e+05,
310 5.6234132519035e+05, 6.4938163157621e+05,
311 7.4989420933246e+05, 8.6596432336007e+05,
315 * decode exponents coded with VLC codes
317 static int decode_exp_vlc(WMACodecContext *s, int ch)
319 int last_exp, n, code;
322 uint32_t *q, *q_end, iv;
323 const float *ptab = pow_tab + 60;
324 const uint32_t *iptab = (const uint32_t *) ptab;
326 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
327 q = (uint32_t *) s->exponents[ch];
328 q_end = q + s->block_len;
330 if (s->version == 1) {
331 last_exp = get_bits(&s->gb, 5) + 10;
333 iv = iptab[last_exp];
341 } while ((n -= 4) > 0);
346 code = get_vlc2(&s->gb, s->exp_vlc.table, EXPVLCBITS, EXPMAX);
348 av_log(s->avctx, AV_LOG_ERROR, "Exponent vlc invalid\n");
351 /* NOTE: this offset is the same as MPEG4 AAC ! */
352 last_exp += code - 60;
353 if ((unsigned) last_exp + 60 >= FF_ARRAY_ELEMS(pow_tab)) {
354 av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n",
359 iv = iptab[last_exp];
368 } while ((n -= 4) > 0);
370 s->max_exponent[ch] = max_scale;
375 * Apply MDCT window and add into output.
377 * We ensure that when the windows overlap their squared sum
378 * is always 1 (MDCT reconstruction rule).
380 static void wma_window(WMACodecContext *s, float *out)
382 float *in = s->output;
383 int block_len, bsize, n;
386 if (s->block_len_bits <= s->prev_block_len_bits) {
387 block_len = s->block_len;
388 bsize = s->frame_len_bits - s->block_len_bits;
390 s->fdsp->vector_fmul_add(out, in, s->windows[bsize],
393 block_len = 1 << s->prev_block_len_bits;
394 n = (s->block_len - block_len) / 2;
395 bsize = s->frame_len_bits - s->prev_block_len_bits;
397 s->fdsp->vector_fmul_add(out + n, in + n, s->windows[bsize],
400 memcpy(out + n + block_len, in + n + block_len, n * sizeof(float));
407 if (s->block_len_bits <= s->next_block_len_bits) {
408 block_len = s->block_len;
409 bsize = s->frame_len_bits - s->block_len_bits;
411 s->fdsp->vector_fmul_reverse(out, in, s->windows[bsize], block_len);
413 block_len = 1 << s->next_block_len_bits;
414 n = (s->block_len - block_len) / 2;
415 bsize = s->frame_len_bits - s->next_block_len_bits;
417 memcpy(out, in, n * sizeof(float));
419 s->fdsp->vector_fmul_reverse(out + n, in + n, s->windows[bsize],
422 memset(out + n + block_len, 0, n * sizeof(float));
427 * @return 0 if OK. 1 if last block of frame. return -1 if
428 * unrecorrable error.
430 static int wma_decode_block(WMACodecContext *s)
432 int n, v, a, ch, bsize;
433 int coef_nb_bits, total_gain;
434 int nb_coefs[MAX_CHANNELS];
439 ff_tlog(s->avctx, "***decode_block: %d:%d\n",
440 s->frame_count - 1, s->block_num);
443 /* compute current block length */
444 if (s->use_variable_block_len) {
445 n = av_log2(s->nb_block_sizes - 1) + 1;
447 if (s->reset_block_lengths) {
448 s->reset_block_lengths = 0;
449 v = get_bits(&s->gb, n);
450 if (v >= s->nb_block_sizes) {
451 av_log(s->avctx, AV_LOG_ERROR,
452 "prev_block_len_bits %d out of range\n",
453 s->frame_len_bits - v);
456 s->prev_block_len_bits = s->frame_len_bits - v;
457 v = get_bits(&s->gb, n);
458 if (v >= s->nb_block_sizes) {
459 av_log(s->avctx, AV_LOG_ERROR,
460 "block_len_bits %d out of range\n",
461 s->frame_len_bits - v);
464 s->block_len_bits = s->frame_len_bits - v;
466 /* update block lengths */
467 s->prev_block_len_bits = s->block_len_bits;
468 s->block_len_bits = s->next_block_len_bits;
470 v = get_bits(&s->gb, n);
471 if (v >= s->nb_block_sizes) {
472 av_log(s->avctx, AV_LOG_ERROR,
473 "next_block_len_bits %d out of range\n",
474 s->frame_len_bits - v);
477 s->next_block_len_bits = s->frame_len_bits - v;
479 /* fixed block len */
480 s->next_block_len_bits = s->frame_len_bits;
481 s->prev_block_len_bits = s->frame_len_bits;
482 s->block_len_bits = s->frame_len_bits;
485 if (s->frame_len_bits - s->block_len_bits >= s->nb_block_sizes){
486 av_log(s->avctx, AV_LOG_ERROR, "block_len_bits not initialized to a valid value\n");
490 /* now check if the block length is coherent with the frame length */
491 s->block_len = 1 << s->block_len_bits;
492 if ((s->block_pos + s->block_len) > s->frame_len) {
493 av_log(s->avctx, AV_LOG_ERROR, "frame_len overflow\n");
497 if (s->avctx->channels == 2)
498 s->ms_stereo = get_bits1(&s->gb);
500 for (ch = 0; ch < s->avctx->channels; ch++) {
501 a = get_bits1(&s->gb);
502 s->channel_coded[ch] = a;
506 bsize = s->frame_len_bits - s->block_len_bits;
508 /* if no channel coded, no need to go further */
509 /* XXX: fix potential framing problems */
513 /* read total gain and extract corresponding number of bits for
514 * coef escape coding */
517 if (get_bits_left(&s->gb) < 7) {
518 av_log(s->avctx, AV_LOG_ERROR, "total_gain overread\n");
519 return AVERROR_INVALIDDATA;
521 a = get_bits(&s->gb, 7);
527 coef_nb_bits = ff_wma_total_gain_to_bits(total_gain);
529 /* compute number of coefficients */
530 n = s->coefs_end[bsize] - s->coefs_start;
531 for (ch = 0; ch < s->avctx->channels; ch++)
535 if (s->use_noise_coding) {
536 for (ch = 0; ch < s->avctx->channels; ch++) {
537 if (s->channel_coded[ch]) {
539 n = s->exponent_high_sizes[bsize];
540 for (i = 0; i < n; i++) {
541 a = get_bits1(&s->gb);
542 s->high_band_coded[ch][i] = a;
543 /* if noise coding, the coefficients are not transmitted */
545 nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
549 for (ch = 0; ch < s->avctx->channels; ch++) {
550 if (s->channel_coded[ch]) {
553 n = s->exponent_high_sizes[bsize];
554 val = (int) 0x80000000;
555 for (i = 0; i < n; i++) {
556 if (s->high_band_coded[ch][i]) {
557 if (val == (int) 0x80000000) {
558 val = get_bits(&s->gb, 7) - 19;
560 code = get_vlc2(&s->gb, s->hgain_vlc.table,
561 HGAINVLCBITS, HGAINMAX);
563 av_log(s->avctx, AV_LOG_ERROR,
564 "hgain vlc invalid\n");
569 s->high_band_values[ch][i] = val;
576 /* exponents can be reused in short blocks. */
577 if ((s->block_len_bits == s->frame_len_bits) || get_bits1(&s->gb)) {
578 for (ch = 0; ch < s->avctx->channels; ch++) {
579 if (s->channel_coded[ch]) {
580 if (s->use_exp_vlc) {
581 if (decode_exp_vlc(s, ch) < 0)
584 decode_exp_lsp(s, ch);
586 s->exponents_bsize[ch] = bsize;
591 /* parse spectral coefficients : just RLE encoding */
592 for (ch = 0; ch < s->avctx->channels; ch++) {
593 if (s->channel_coded[ch]) {
595 WMACoef *ptr = &s->coefs1[ch][0];
597 /* special VLC tables are used for ms stereo because
598 * there is potentially less energy there */
599 tindex = (ch == 1 && s->ms_stereo);
600 memset(ptr, 0, s->block_len * sizeof(WMACoef));
601 ff_wma_run_level_decode(s->avctx, &s->gb, &s->coef_vlc[tindex],
602 s->level_table[tindex], s->run_table[tindex],
603 0, ptr, 0, nb_coefs[ch],
604 s->block_len, s->frame_len_bits, coef_nb_bits);
606 if (s->version == 1 && s->avctx->channels >= 2)
607 align_get_bits(&s->gb);
612 int n4 = s->block_len / 2;
613 mdct_norm = 1.0 / (float) n4;
615 mdct_norm *= sqrt(n4);
618 /* finally compute the MDCT coefficients */
619 for (ch = 0; ch < s->avctx->channels; ch++) {
620 if (s->channel_coded[ch]) {
622 float *coefs, *exponents, mult, mult1, noise;
623 int i, j, n, n1, last_high_band, esize;
624 float exp_power[HIGH_BAND_MAX_SIZE];
626 coefs1 = s->coefs1[ch];
627 exponents = s->exponents[ch];
628 esize = s->exponents_bsize[ch];
629 mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
631 coefs = s->coefs[ch];
632 if (s->use_noise_coding) {
634 /* very low freqs : noise */
635 for (i = 0; i < s->coefs_start; i++) {
636 *coefs++ = s->noise_table[s->noise_index] *
637 exponents[i << bsize >> esize] * mult1;
638 s->noise_index = (s->noise_index + 1) &
639 (NOISE_TAB_SIZE - 1);
642 n1 = s->exponent_high_sizes[bsize];
644 /* compute power of high bands */
645 exponents = s->exponents[ch] +
646 (s->high_band_start[bsize] << bsize >> esize);
647 last_high_band = 0; /* avoid warning */
648 for (j = 0; j < n1; j++) {
649 n = s->exponent_high_bands[s->frame_len_bits -
650 s->block_len_bits][j];
651 if (s->high_band_coded[ch][j]) {
654 for (i = 0; i < n; i++) {
655 v = exponents[i << bsize >> esize];
658 exp_power[j] = e2 / n;
660 ff_tlog(s->avctx, "%d: power=%f (%d)\n", j, exp_power[j], n);
662 exponents += n << bsize >> esize;
665 /* main freqs and high freqs */
666 exponents = s->exponents[ch] + (s->coefs_start << bsize >> esize);
667 for (j = -1; j < n1; j++) {
669 n = s->high_band_start[bsize] - s->coefs_start;
671 n = s->exponent_high_bands[s->frame_len_bits -
672 s->block_len_bits][j];
673 if (j >= 0 && s->high_band_coded[ch][j]) {
674 /* use noise with specified power */
675 mult1 = sqrt(exp_power[j] / exp_power[last_high_band]);
676 /* XXX: use a table */
677 mult1 = mult1 * pow(10, s->high_band_values[ch][j] * 0.05);
678 mult1 = mult1 / (s->max_exponent[ch] * s->noise_mult);
680 for (i = 0; i < n; i++) {
681 noise = s->noise_table[s->noise_index];
682 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
683 *coefs++ = noise * exponents[i << bsize >> esize] * mult1;
685 exponents += n << bsize >> esize;
687 /* coded values + small noise */
688 for (i = 0; i < n; i++) {
689 noise = s->noise_table[s->noise_index];
690 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
691 *coefs++ = ((*coefs1++) + noise) *
692 exponents[i << bsize >> esize] * mult;
694 exponents += n << bsize >> esize;
698 /* very high freqs : noise */
699 n = s->block_len - s->coefs_end[bsize];
700 mult1 = mult * exponents[(-(1 << bsize)) >> esize];
701 for (i = 0; i < n; i++) {
702 *coefs++ = s->noise_table[s->noise_index] * mult1;
703 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
706 /* XXX: optimize more */
707 for (i = 0; i < s->coefs_start; i++)
710 for (i = 0; i < n; i++)
711 *coefs++ = coefs1[i] * exponents[i << bsize >> esize] * mult;
712 n = s->block_len - s->coefs_end[bsize];
713 for (i = 0; i < n; i++)
720 for (ch = 0; ch < s->avctx->channels; ch++) {
721 if (s->channel_coded[ch]) {
722 dump_floats(s, "exponents", 3, s->exponents[ch], s->block_len);
723 dump_floats(s, "coefs", 1, s->coefs[ch], s->block_len);
728 if (s->ms_stereo && s->channel_coded[1]) {
729 /* nominal case for ms stereo: we do it before mdct */
730 /* no need to optimize this case because it should almost
732 if (!s->channel_coded[0]) {
733 ff_tlog(s->avctx, "rare ms-stereo case happened\n");
734 memset(s->coefs[0], 0, sizeof(float) * s->block_len);
735 s->channel_coded[0] = 1;
738 s->fdsp->butterflies_float(s->coefs[0], s->coefs[1], s->block_len);
742 mdct = &s->mdct_ctx[bsize];
744 for (ch = 0; ch < s->avctx->channels; ch++) {
747 n4 = s->block_len / 2;
748 if (s->channel_coded[ch])
749 mdct->imdct_calc(mdct, s->output, s->coefs[ch]);
750 else if (!(s->ms_stereo && ch == 1))
751 memset(s->output, 0, sizeof(s->output));
753 /* multiply by the window and add in the frame */
754 index = (s->frame_len / 2) + s->block_pos - n4;
755 wma_window(s, &s->frame_out[ch][index]);
758 /* update block number */
760 s->block_pos += s->block_len;
761 if (s->block_pos >= s->frame_len)
767 /* decode a frame of frame_len samples */
768 static int wma_decode_frame(WMACodecContext *s, float **samples,
774 ff_tlog(s->avctx, "***decode_frame: %d size=%d\n",
775 s->frame_count++, s->frame_len);
778 /* read each block */
782 ret = wma_decode_block(s);
789 for (ch = 0; ch < s->avctx->channels; ch++) {
790 /* copy current block to output */
791 memcpy(samples[ch] + samples_offset, s->frame_out[ch],
792 s->frame_len * sizeof(*s->frame_out[ch]));
793 /* prepare for next block */
794 memmove(&s->frame_out[ch][0], &s->frame_out[ch][s->frame_len],
795 s->frame_len * sizeof(*s->frame_out[ch]));
798 dump_floats(s, "samples", 6, samples[ch] + samples_offset,
806 static int wma_decode_superframe(AVCodecContext *avctx, void *data,
807 int *got_frame_ptr, AVPacket *avpkt)
809 AVFrame *frame = data;
810 const uint8_t *buf = avpkt->data;
811 int buf_size = avpkt->size;
812 WMACodecContext *s = avctx->priv_data;
813 int nb_frames, bit_offset, i, pos, len, ret;
818 ff_tlog(avctx, "***decode_superframe:\n");
821 s->last_superframe_len = 0;
824 if (buf_size < avctx->block_align) {
825 av_log(avctx, AV_LOG_ERROR,
826 "Input packet size too small (%d < %d)\n",
827 buf_size, avctx->block_align);
828 return AVERROR_INVALIDDATA;
830 if (avctx->block_align)
831 buf_size = avctx->block_align;
833 init_get_bits(&s->gb, buf, buf_size * 8);
835 if (s->use_bit_reservoir) {
836 /* read super frame header */
837 skip_bits(&s->gb, 4); /* super frame index */
838 nb_frames = get_bits(&s->gb, 4) - (s->last_superframe_len <= 0);
839 if (nb_frames <= 0) {
840 int is_error = nb_frames < 0 || get_bits_left(&s->gb) <= 8;
841 av_log(avctx, is_error ? AV_LOG_ERROR : AV_LOG_WARNING,
842 "nb_frames is %d bits left %d\n",
843 nb_frames, get_bits_left(&s->gb));
845 return AVERROR_INVALIDDATA;
847 if ((s->last_superframe_len + buf_size - 1) >
848 MAX_CODED_SUPERFRAME_SIZE)
851 q = s->last_superframe + s->last_superframe_len;
854 *q++ = get_bits (&s->gb, 8);
857 memset(q, 0, AV_INPUT_BUFFER_PADDING_SIZE);
859 s->last_superframe_len += 8*buf_size - 8;
860 // s->reset_block_lengths = 1; //XXX is this needed ?
867 /* get output buffer */
868 frame->nb_samples = nb_frames * s->frame_len;
869 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
871 samples = (float **) frame->extended_data;
874 if (s->use_bit_reservoir) {
875 bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
876 if (bit_offset > get_bits_left(&s->gb)) {
877 av_log(avctx, AV_LOG_ERROR,
878 "Invalid last frame bit offset %d > buf size %d (%d)\n",
879 bit_offset, get_bits_left(&s->gb), buf_size);
883 if (s->last_superframe_len > 0) {
884 /* add bit_offset bits to last frame */
885 if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) >
886 MAX_CODED_SUPERFRAME_SIZE)
888 q = s->last_superframe + s->last_superframe_len;
891 *q++ = (get_bits) (&s->gb, 8);
895 *q++ = (get_bits) (&s->gb, len) << (8 - len);
896 memset(q, 0, AV_INPUT_BUFFER_PADDING_SIZE);
898 /* XXX: bit_offset bits into last frame */
899 init_get_bits(&s->gb, s->last_superframe,
900 s->last_superframe_len * 8 + bit_offset);
901 /* skip unused bits */
902 if (s->last_bitoffset > 0)
903 skip_bits(&s->gb, s->last_bitoffset);
904 /* this frame is stored in the last superframe and in the
906 if (wma_decode_frame(s, samples, samples_offset) < 0)
908 samples_offset += s->frame_len;
912 /* read each frame starting from bit_offset */
913 pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
914 if (pos >= MAX_CODED_SUPERFRAME_SIZE * 8 || pos > buf_size * 8)
915 return AVERROR_INVALIDDATA;
916 init_get_bits(&s->gb, buf + (pos >> 3), (buf_size - (pos >> 3)) * 8);
919 skip_bits(&s->gb, len);
921 s->reset_block_lengths = 1;
922 for (i = 0; i < nb_frames; i++) {
923 if (wma_decode_frame(s, samples, samples_offset) < 0)
925 samples_offset += s->frame_len;
928 /* we copy the end of the frame in the last frame buffer */
929 pos = get_bits_count(&s->gb) +
930 ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7);
931 s->last_bitoffset = pos & 7;
933 len = buf_size - pos;
934 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) {
935 av_log(s->avctx, AV_LOG_ERROR, "len %d invalid\n", len);
938 s->last_superframe_len = len;
939 memcpy(s->last_superframe, buf + pos, len);
941 /* single frame decode */
942 if (wma_decode_frame(s, samples, samples_offset) < 0)
944 samples_offset += s->frame_len;
947 ff_dlog(s->avctx, "%d %d %d %d outbytes:%"PTRDIFF_SPECIFIER" eaten:%d\n",
948 s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len,
949 (int8_t *) samples - (int8_t *) data, avctx->block_align);
956 /* when error, we reset the bit reservoir */
957 s->last_superframe_len = 0;
961 static av_cold void flush(AVCodecContext *avctx)
963 WMACodecContext *s = avctx->priv_data;
966 s->last_superframe_len = 0;
969 #if CONFIG_WMAV1_DECODER
970 AVCodec ff_wmav1_decoder = {
972 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
973 .type = AVMEDIA_TYPE_AUDIO,
974 .id = AV_CODEC_ID_WMAV1,
975 .priv_data_size = sizeof(WMACodecContext),
976 .init = wma_decode_init,
978 .decode = wma_decode_superframe,
980 .capabilities = AV_CODEC_CAP_DR1,
981 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
982 AV_SAMPLE_FMT_NONE },
985 #if CONFIG_WMAV2_DECODER
986 AVCodec ff_wmav2_decoder = {
988 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
989 .type = AVMEDIA_TYPE_AUDIO,
990 .id = AV_CODEC_ID_WMAV2,
991 .priv_data_size = sizeof(WMACodecContext),
992 .init = wma_decode_init,
994 .decode = wma_decode_superframe,
996 .capabilities = AV_CODEC_CAP_DR1,
997 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
998 AV_SAMPLE_FMT_NONE },