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"
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(avctx->codec->id == AV_CODEC_ID_WMAV2 && avctx->extradata_size >= 8){
97 if(AV_RL16(extradata+4)==0xd && s->use_variable_block_len){
98 av_log(avctx, AV_LOG_WARNING, "Disabling use_variable_block_len, if this fails contact the ffmpeg developers and send us the file\n");
99 s->use_variable_block_len= 0; // this fixes issue1503
103 for (i=0; i<MAX_CHANNELS; i++)
104 s->max_exponent[i] = 1.0;
106 if(ff_wma_init(avctx, flags2)<0)
110 for(i = 0; i < s->nb_block_sizes; i++)
111 ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 1, 1.0 / 32768.0);
113 if (s->use_noise_coding) {
114 init_vlc(&s->hgain_vlc, HGAINVLCBITS, sizeof(ff_wma_hgain_huffbits),
115 ff_wma_hgain_huffbits, 1, 1,
116 ff_wma_hgain_huffcodes, 2, 2, 0);
119 if (s->use_exp_vlc) {
120 init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(ff_aac_scalefactor_bits), //FIXME move out of context
121 ff_aac_scalefactor_bits, 1, 1,
122 ff_aac_scalefactor_code, 4, 4, 0);
124 wma_lsp_to_curve_init(s, s->frame_len);
127 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
133 * compute x^-0.25 with an exponent and mantissa table. We use linear
134 * interpolation to reduce the mantissa table size at a small speed
135 * expense (linear interpolation approximately doubles the number of
136 * bits of precision).
138 static inline float pow_m1_4(WMACodecContext *s, float x)
149 m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
150 /* build interpolation scale: 1 <= t < 2. */
151 t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
152 a = s->lsp_pow_m_table1[m];
153 b = s->lsp_pow_m_table2[m];
154 return s->lsp_pow_e_table[e] * (a + b * t.f);
157 static av_cold void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len)
162 wdel = M_PI / frame_len;
163 for(i=0;i<frame_len;i++)
164 s->lsp_cos_table[i] = 2.0f * cos(wdel * i);
166 /* tables for x^-0.25 computation */
169 s->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
172 /* NOTE: these two tables are needed to avoid two operations in
175 for(i=(1 << LSP_POW_BITS) - 1;i>=0;i--) {
176 m = (1 << LSP_POW_BITS) + i;
177 a = (float)m * (0.5 / (1 << LSP_POW_BITS));
179 s->lsp_pow_m_table1[i] = 2 * a - b;
180 s->lsp_pow_m_table2[i] = b - a;
186 * NOTE: We use the same code as Vorbis here
187 * @todo optimize it further with SSE/3Dnow
189 static void wma_lsp_to_curve(WMACodecContext *s,
190 float *out, float *val_max_ptr,
194 float p, q, w, v, val_max;
200 w = s->lsp_cos_table[i];
201 for(j=1;j<NB_LSP_COEFS;j+=2){
213 *val_max_ptr = val_max;
217 * decode exponents coded with LSP coefficients (same idea as Vorbis)
219 static void decode_exp_lsp(WMACodecContext *s, int ch)
221 float lsp_coefs[NB_LSP_COEFS];
224 for(i = 0; i < NB_LSP_COEFS; i++) {
225 if (i == 0 || i >= 8)
226 val = get_bits(&s->gb, 3);
228 val = get_bits(&s->gb, 4);
229 lsp_coefs[i] = ff_wma_lsp_codebook[i][val];
232 wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch],
233 s->block_len, lsp_coefs);
236 /** pow(10, i / 16.0) for i in -60..95 */
237 static const float pow_tab[] = {
238 1.7782794100389e-04, 2.0535250264571e-04,
239 2.3713737056617e-04, 2.7384196342644e-04,
240 3.1622776601684e-04, 3.6517412725484e-04,
241 4.2169650342858e-04, 4.8696752516586e-04,
242 5.6234132519035e-04, 6.4938163157621e-04,
243 7.4989420933246e-04, 8.6596432336006e-04,
244 1.0000000000000e-03, 1.1547819846895e-03,
245 1.3335214321633e-03, 1.5399265260595e-03,
246 1.7782794100389e-03, 2.0535250264571e-03,
247 2.3713737056617e-03, 2.7384196342644e-03,
248 3.1622776601684e-03, 3.6517412725484e-03,
249 4.2169650342858e-03, 4.8696752516586e-03,
250 5.6234132519035e-03, 6.4938163157621e-03,
251 7.4989420933246e-03, 8.6596432336006e-03,
252 1.0000000000000e-02, 1.1547819846895e-02,
253 1.3335214321633e-02, 1.5399265260595e-02,
254 1.7782794100389e-02, 2.0535250264571e-02,
255 2.3713737056617e-02, 2.7384196342644e-02,
256 3.1622776601684e-02, 3.6517412725484e-02,
257 4.2169650342858e-02, 4.8696752516586e-02,
258 5.6234132519035e-02, 6.4938163157621e-02,
259 7.4989420933246e-02, 8.6596432336007e-02,
260 1.0000000000000e-01, 1.1547819846895e-01,
261 1.3335214321633e-01, 1.5399265260595e-01,
262 1.7782794100389e-01, 2.0535250264571e-01,
263 2.3713737056617e-01, 2.7384196342644e-01,
264 3.1622776601684e-01, 3.6517412725484e-01,
265 4.2169650342858e-01, 4.8696752516586e-01,
266 5.6234132519035e-01, 6.4938163157621e-01,
267 7.4989420933246e-01, 8.6596432336007e-01,
268 1.0000000000000e+00, 1.1547819846895e+00,
269 1.3335214321633e+00, 1.5399265260595e+00,
270 1.7782794100389e+00, 2.0535250264571e+00,
271 2.3713737056617e+00, 2.7384196342644e+00,
272 3.1622776601684e+00, 3.6517412725484e+00,
273 4.2169650342858e+00, 4.8696752516586e+00,
274 5.6234132519035e+00, 6.4938163157621e+00,
275 7.4989420933246e+00, 8.6596432336007e+00,
276 1.0000000000000e+01, 1.1547819846895e+01,
277 1.3335214321633e+01, 1.5399265260595e+01,
278 1.7782794100389e+01, 2.0535250264571e+01,
279 2.3713737056617e+01, 2.7384196342644e+01,
280 3.1622776601684e+01, 3.6517412725484e+01,
281 4.2169650342858e+01, 4.8696752516586e+01,
282 5.6234132519035e+01, 6.4938163157621e+01,
283 7.4989420933246e+01, 8.6596432336007e+01,
284 1.0000000000000e+02, 1.1547819846895e+02,
285 1.3335214321633e+02, 1.5399265260595e+02,
286 1.7782794100389e+02, 2.0535250264571e+02,
287 2.3713737056617e+02, 2.7384196342644e+02,
288 3.1622776601684e+02, 3.6517412725484e+02,
289 4.2169650342858e+02, 4.8696752516586e+02,
290 5.6234132519035e+02, 6.4938163157621e+02,
291 7.4989420933246e+02, 8.6596432336007e+02,
292 1.0000000000000e+03, 1.1547819846895e+03,
293 1.3335214321633e+03, 1.5399265260595e+03,
294 1.7782794100389e+03, 2.0535250264571e+03,
295 2.3713737056617e+03, 2.7384196342644e+03,
296 3.1622776601684e+03, 3.6517412725484e+03,
297 4.2169650342858e+03, 4.8696752516586e+03,
298 5.6234132519035e+03, 6.4938163157621e+03,
299 7.4989420933246e+03, 8.6596432336007e+03,
300 1.0000000000000e+04, 1.1547819846895e+04,
301 1.3335214321633e+04, 1.5399265260595e+04,
302 1.7782794100389e+04, 2.0535250264571e+04,
303 2.3713737056617e+04, 2.7384196342644e+04,
304 3.1622776601684e+04, 3.6517412725484e+04,
305 4.2169650342858e+04, 4.8696752516586e+04,
306 5.6234132519035e+04, 6.4938163157621e+04,
307 7.4989420933246e+04, 8.6596432336007e+04,
308 1.0000000000000e+05, 1.1547819846895e+05,
309 1.3335214321633e+05, 1.5399265260595e+05,
310 1.7782794100389e+05, 2.0535250264571e+05,
311 2.3713737056617e+05, 2.7384196342644e+05,
312 3.1622776601684e+05, 3.6517412725484e+05,
313 4.2169650342858e+05, 4.8696752516586e+05,
314 5.6234132519035e+05, 6.4938163157621e+05,
315 7.4989420933246e+05, 8.6596432336007e+05,
319 * decode exponents coded with VLC codes
321 static int decode_exp_vlc(WMACodecContext *s, int ch)
323 int last_exp, n, code;
326 uint32_t *q, *q_end, iv;
327 const float *ptab = pow_tab + 60;
328 const uint32_t *iptab = (const uint32_t*)ptab;
330 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
331 q = (uint32_t *)s->exponents[ch];
332 q_end = q + s->block_len;
334 if (s->version == 1) {
335 last_exp = get_bits(&s->gb, 5) + 10;
337 iv = iptab[last_exp];
345 } while ((n -= 4) > 0);
350 code = get_vlc2(&s->gb, s->exp_vlc.table, EXPVLCBITS, EXPMAX);
352 av_log(s->avctx, AV_LOG_ERROR, "Exponent vlc invalid\n");
355 /* NOTE: this offset is the same as MPEG4 AAC ! */
356 last_exp += code - 60;
357 if ((unsigned)last_exp + 60 >= FF_ARRAY_ELEMS(pow_tab)) {
358 av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n",
363 iv = iptab[last_exp];
372 } while ((n -= 4) > 0);
374 s->max_exponent[ch] = max_scale;
380 * Apply MDCT window and add into output.
382 * We ensure that when the windows overlap their squared sum
383 * is always 1 (MDCT reconstruction rule).
385 static void wma_window(WMACodecContext *s, float *out)
387 float *in = s->output;
388 int block_len, bsize, n;
391 if (s->block_len_bits <= s->prev_block_len_bits) {
392 block_len = s->block_len;
393 bsize = s->frame_len_bits - s->block_len_bits;
395 s->fdsp.vector_fmul_add(out, in, s->windows[bsize],
399 block_len = 1 << s->prev_block_len_bits;
400 n = (s->block_len - block_len) / 2;
401 bsize = s->frame_len_bits - s->prev_block_len_bits;
403 s->fdsp.vector_fmul_add(out+n, in+n, s->windows[bsize],
406 memcpy(out+n+block_len, in+n+block_len, n*sizeof(float));
413 if (s->block_len_bits <= s->next_block_len_bits) {
414 block_len = s->block_len;
415 bsize = s->frame_len_bits - s->block_len_bits;
417 s->fdsp.vector_fmul_reverse(out, in, s->windows[bsize], block_len);
420 block_len = 1 << s->next_block_len_bits;
421 n = (s->block_len - block_len) / 2;
422 bsize = s->frame_len_bits - s->next_block_len_bits;
424 memcpy(out, in, n*sizeof(float));
426 s->fdsp.vector_fmul_reverse(out+n, in+n, s->windows[bsize], block_len);
428 memset(out+n+block_len, 0, n*sizeof(float));
434 * @return 0 if OK. 1 if last block of frame. return -1 if
435 * unrecorrable error.
437 static int wma_decode_block(WMACodecContext *s)
439 int n, v, a, ch, bsize;
440 int coef_nb_bits, total_gain;
441 int nb_coefs[MAX_CHANNELS];
446 tprintf(s->avctx, "***decode_block: %d:%d\n", s->frame_count - 1, s->block_num);
449 /* compute current block length */
450 if (s->use_variable_block_len) {
451 n = av_log2(s->nb_block_sizes - 1) + 1;
453 if (s->reset_block_lengths) {
454 s->reset_block_lengths = 0;
455 v = get_bits(&s->gb, n);
456 if (v >= s->nb_block_sizes){
457 av_log(s->avctx, AV_LOG_ERROR, "prev_block_len_bits %d out of range\n", s->frame_len_bits - v);
460 s->prev_block_len_bits = s->frame_len_bits - v;
461 v = get_bits(&s->gb, n);
462 if (v >= s->nb_block_sizes){
463 av_log(s->avctx, AV_LOG_ERROR, "block_len_bits %d out of range\n", s->frame_len_bits - v);
466 s->block_len_bits = s->frame_len_bits - v;
468 /* update block lengths */
469 s->prev_block_len_bits = s->block_len_bits;
470 s->block_len_bits = s->next_block_len_bits;
472 v = get_bits(&s->gb, n);
473 if (v >= s->nb_block_sizes){
474 av_log(s->avctx, AV_LOG_ERROR, "next_block_len_bits %d out of range\n", 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);
501 for(ch = 0; ch < s->avctx->channels; ch++) {
502 a = get_bits1(&s->gb);
503 s->channel_coded[ch] = a;
507 bsize = s->frame_len_bits - s->block_len_bits;
509 /* if no channel coded, no need to go further */
510 /* XXX: fix potential framing problems */
514 /* read total gain and extract corresponding number of bits for
515 coef escape coding */
518 if (get_bits_left(&s->gb) < 7) {
519 av_log(s->avctx, AV_LOG_ERROR, "total_gain overread\n");
520 return AVERROR_INVALIDDATA;
522 a = get_bits(&s->gb, 7);
528 coef_nb_bits= ff_wma_total_gain_to_bits(total_gain);
530 /* compute number of coefficients */
531 n = s->coefs_end[bsize] - s->coefs_start;
532 for(ch = 0; ch < s->avctx->channels; ch++)
536 if (s->use_noise_coding) {
538 for(ch = 0; ch < s->avctx->channels; ch++) {
539 if (s->channel_coded[ch]) {
541 n = s->exponent_high_sizes[bsize];
543 a = get_bits1(&s->gb);
544 s->high_band_coded[ch][i] = a;
545 /* if noise coding, the coefficients are not transmitted */
547 nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
551 for(ch = 0; ch < s->avctx->channels; ch++) {
552 if (s->channel_coded[ch]) {
555 n = s->exponent_high_sizes[bsize];
556 val = (int)0x80000000;
558 if (s->high_band_coded[ch][i]) {
559 if (val == (int)0x80000000) {
560 val = get_bits(&s->gb, 7) - 19;
562 code = get_vlc2(&s->gb, s->hgain_vlc.table, HGAINVLCBITS, HGAINMAX);
564 av_log(s->avctx, AV_LOG_ERROR, "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) ||
579 for(ch = 0; ch < s->avctx->channels; ch++) {
580 if (s->channel_coded[ch]) {
581 if (s->use_exp_vlc) {
582 if (decode_exp_vlc(s, ch) < 0)
585 decode_exp_lsp(s, ch);
587 s->exponents_bsize[ch] = bsize;
592 /* parse spectral coefficients : just RLE encoding */
593 for (ch = 0; ch < s->avctx->channels; ch++) {
594 if (s->channel_coded[ch]) {
596 WMACoef* ptr = &s->coefs1[ch][0];
598 /* special VLC tables are used for ms stereo because
599 there is potentially less energy there */
600 tindex = (ch == 1 && s->ms_stereo);
601 memset(ptr, 0, s->block_len * sizeof(WMACoef));
602 ff_wma_run_level_decode(s->avctx, &s->gb, &s->coef_vlc[tindex],
603 s->level_table[tindex], s->run_table[tindex],
604 0, ptr, 0, nb_coefs[ch],
605 s->block_len, s->frame_len_bits, coef_nb_bits);
607 if (s->version == 1 && s->avctx->channels >= 2) {
608 align_get_bits(&s->gb);
614 int n4 = s->block_len / 2;
615 mdct_norm = 1.0 / (float)n4;
616 if (s->version == 1) {
617 mdct_norm *= sqrt(n4);
621 /* finally compute the MDCT coefficients */
622 for (ch = 0; ch < s->avctx->channels; ch++) {
623 if (s->channel_coded[ch]) {
625 float *coefs, *exponents, mult, mult1, noise;
626 int i, j, n, n1, last_high_band, esize;
627 float exp_power[HIGH_BAND_MAX_SIZE];
629 coefs1 = s->coefs1[ch];
630 exponents = s->exponents[ch];
631 esize = s->exponents_bsize[ch];
632 mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
634 coefs = s->coefs[ch];
635 if (s->use_noise_coding) {
637 /* very low freqs : noise */
638 for(i = 0;i < s->coefs_start; i++) {
639 *coefs++ = s->noise_table[s->noise_index] *
640 exponents[i<<bsize>>esize] * mult1;
641 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
644 n1 = s->exponent_high_sizes[bsize];
646 /* compute power of high bands */
647 exponents = s->exponents[ch] +
648 (s->high_band_start[bsize]<<bsize>>esize);
649 last_high_band = 0; /* avoid warning */
651 n = s->exponent_high_bands[s->frame_len_bits -
652 s->block_len_bits][j];
653 if (s->high_band_coded[ch][j]) {
656 for(i = 0;i < n; i++) {
657 v = exponents[i<<bsize>>esize];
660 exp_power[j] = e2 / n;
662 tprintf(s->avctx, "%d: power=%f (%d)\n", j, exp_power[j], n);
664 exponents += n<<bsize>>esize;
667 /* main freqs and high freqs */
668 exponents = s->exponents[ch] + (s->coefs_start<<bsize>>esize);
671 n = s->high_band_start[bsize] -
674 n = s->exponent_high_bands[s->frame_len_bits -
675 s->block_len_bits][j];
677 if (j >= 0 && s->high_band_coded[ch][j]) {
678 /* use noise with specified power */
679 mult1 = sqrt(exp_power[j] / exp_power[last_high_band]);
680 /* XXX: use a table */
681 mult1 = mult1 * pow(10, s->high_band_values[ch][j] * 0.05);
682 mult1 = mult1 / (s->max_exponent[ch] * s->noise_mult);
684 for(i = 0;i < n; i++) {
685 noise = s->noise_table[s->noise_index];
686 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
688 exponents[i<<bsize>>esize] * mult1;
690 exponents += n<<bsize>>esize;
692 /* coded values + small noise */
693 for(i = 0;i < n; i++) {
694 noise = s->noise_table[s->noise_index];
695 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
696 *coefs++ = ((*coefs1++) + noise) *
697 exponents[i<<bsize>>esize] * mult;
699 exponents += n<<bsize>>esize;
703 /* very high freqs : noise */
704 n = s->block_len - s->coefs_end[bsize];
705 mult1 = mult * exponents[((-1<<bsize))>>esize];
706 for(i = 0; i < n; i++) {
707 *coefs++ = s->noise_table[s->noise_index] * mult1;
708 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
711 /* XXX: optimize more */
712 for(i = 0;i < s->coefs_start; i++)
715 for(i = 0;i < n; i++) {
716 *coefs++ = coefs1[i] * exponents[i<<bsize>>esize] * mult;
718 n = s->block_len - s->coefs_end[bsize];
719 for(i = 0;i < n; i++)
726 for (ch = 0; ch < s->avctx->channels; ch++) {
727 if (s->channel_coded[ch]) {
728 dump_floats(s, "exponents", 3, s->exponents[ch], s->block_len);
729 dump_floats(s, "coefs", 1, s->coefs[ch], s->block_len);
734 if (s->ms_stereo && s->channel_coded[1]) {
735 /* nominal case for ms stereo: we do it before mdct */
736 /* no need to optimize this case because it should almost
738 if (!s->channel_coded[0]) {
739 tprintf(s->avctx, "rare ms-stereo case happened\n");
740 memset(s->coefs[0], 0, sizeof(float) * s->block_len);
741 s->channel_coded[0] = 1;
744 s->fdsp.butterflies_float(s->coefs[0], s->coefs[1], s->block_len);
748 mdct = &s->mdct_ctx[bsize];
750 for (ch = 0; ch < s->avctx->channels; ch++) {
753 n4 = s->block_len / 2;
754 if(s->channel_coded[ch]){
755 mdct->imdct_calc(mdct, s->output, s->coefs[ch]);
756 }else if(!(s->ms_stereo && ch==1))
757 memset(s->output, 0, sizeof(s->output));
759 /* multiply by the window and add in the frame */
760 index = (s->frame_len / 2) + s->block_pos - n4;
761 wma_window(s, &s->frame_out[ch][index]);
764 /* update block number */
766 s->block_pos += s->block_len;
767 if (s->block_pos >= s->frame_len)
773 /* decode a frame of frame_len samples */
774 static int wma_decode_frame(WMACodecContext *s, float **samples,
780 tprintf(s->avctx, "***decode_frame: %d size=%d\n", s->frame_count++, s->frame_len);
783 /* read each block */
787 ret = wma_decode_block(s);
794 for (ch = 0; ch < s->avctx->channels; ch++) {
795 /* copy current block to output */
796 memcpy(samples[ch] + samples_offset, s->frame_out[ch],
797 s->frame_len * sizeof(*s->frame_out[ch]));
798 /* prepare for next block */
799 memmove(&s->frame_out[ch][0], &s->frame_out[ch][s->frame_len],
800 s->frame_len * sizeof(*s->frame_out[ch]));
803 dump_floats(s, "samples", 6, samples[ch] + samples_offset, s->frame_len);
810 static int wma_decode_superframe(AVCodecContext *avctx, void *data,
811 int *got_frame_ptr, AVPacket *avpkt)
813 AVFrame *frame = data;
814 const uint8_t *buf = avpkt->data;
815 int buf_size = avpkt->size;
816 WMACodecContext *s = avctx->priv_data;
817 int nb_frames, bit_offset, i, pos, len, ret;
822 tprintf(avctx, "***decode_superframe:\n");
825 s->last_superframe_len = 0;
828 if (buf_size < avctx->block_align) {
829 av_log(avctx, AV_LOG_ERROR,
830 "Input packet size too small (%d < %d)\n",
831 buf_size, avctx->block_align);
832 return AVERROR_INVALIDDATA;
834 if(avctx->block_align)
835 buf_size = avctx->block_align;
837 init_get_bits(&s->gb, buf, buf_size*8);
839 if (s->use_bit_reservoir) {
840 /* read super frame header */
841 skip_bits(&s->gb, 4); /* super frame index */
842 nb_frames = get_bits(&s->gb, 4) - (s->last_superframe_len <= 0);
843 if (nb_frames <= 0) {
844 av_log(avctx, AV_LOG_ERROR, "nb_frames is %d\n", nb_frames);
845 return AVERROR_INVALIDDATA;
851 /* get output buffer */
852 frame->nb_samples = nb_frames * s->frame_len;
853 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
855 samples = (float **)frame->extended_data;
858 if (s->use_bit_reservoir) {
859 bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
860 if (bit_offset > get_bits_left(&s->gb)) {
861 av_log(avctx, AV_LOG_ERROR,
862 "Invalid last frame bit offset %d > buf size %d (%d)\n",
863 bit_offset, get_bits_left(&s->gb), buf_size);
867 if (s->last_superframe_len > 0) {
868 /* add bit_offset bits to last frame */
869 if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) >
870 MAX_CODED_SUPERFRAME_SIZE)
872 q = s->last_superframe + s->last_superframe_len;
875 *q++ = (get_bits)(&s->gb, 8);
879 *q++ = (get_bits)(&s->gb, len) << (8 - len);
881 memset(q, 0, FF_INPUT_BUFFER_PADDING_SIZE);
883 /* XXX: bit_offset bits into last frame */
884 init_get_bits(&s->gb, s->last_superframe, s->last_superframe_len * 8 + bit_offset);
885 /* skip unused bits */
886 if (s->last_bitoffset > 0)
887 skip_bits(&s->gb, s->last_bitoffset);
888 /* this frame is stored in the last superframe and in the
890 if (wma_decode_frame(s, samples, samples_offset) < 0)
892 samples_offset += s->frame_len;
896 /* read each frame starting from bit_offset */
897 pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
898 if (pos >= MAX_CODED_SUPERFRAME_SIZE * 8 || pos > buf_size * 8)
899 return AVERROR_INVALIDDATA;
900 init_get_bits(&s->gb, buf + (pos >> 3), (buf_size - (pos >> 3))*8);
903 skip_bits(&s->gb, len);
905 s->reset_block_lengths = 1;
906 for(i=0;i<nb_frames;i++) {
907 if (wma_decode_frame(s, samples, samples_offset) < 0)
909 samples_offset += s->frame_len;
912 /* we copy the end of the frame in the last frame buffer */
913 pos = get_bits_count(&s->gb) + ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7);
914 s->last_bitoffset = pos & 7;
916 len = buf_size - pos;
917 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) {
918 av_log(s->avctx, AV_LOG_ERROR, "len %d invalid\n", len);
921 s->last_superframe_len = len;
922 memcpy(s->last_superframe, buf + pos, len);
924 /* single frame decode */
925 if (wma_decode_frame(s, samples, samples_offset) < 0)
927 samples_offset += s->frame_len;
930 av_dlog(s->avctx, "%d %d %d %d outbytes:%td eaten:%d\n",
931 s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len,
932 (int8_t *)samples - (int8_t *)data, avctx->block_align);
938 /* when error, we reset the bit reservoir */
939 s->last_superframe_len = 0;
943 static av_cold void flush(AVCodecContext *avctx)
945 WMACodecContext *s = avctx->priv_data;
948 s->last_superframe_len= 0;
951 #if CONFIG_WMAV1_DECODER
952 AVCodec ff_wmav1_decoder = {
954 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
955 .type = AVMEDIA_TYPE_AUDIO,
956 .id = AV_CODEC_ID_WMAV1,
957 .priv_data_size = sizeof(WMACodecContext),
958 .init = wma_decode_init,
960 .decode = wma_decode_superframe,
962 .capabilities = CODEC_CAP_DR1,
963 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
964 AV_SAMPLE_FMT_NONE },
967 #if CONFIG_WMAV2_DECODER
968 AVCodec ff_wmav2_decoder = {
970 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
971 .type = AVMEDIA_TYPE_AUDIO,
972 .id = AV_CODEC_ID_WMAV2,
973 .priv_data_size = sizeof(WMACodecContext),
974 .init = wma_decode_init,
976 .decode = wma_decode_superframe,
978 .capabilities = CODEC_CAP_DR1,
979 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
980 AV_SAMPLE_FMT_NONE },