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 if(ff_wma_init(avctx, flags2)<0)
107 for(i = 0; i < s->nb_block_sizes; i++)
108 ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 1, 1.0 / 32768.0);
110 if (s->use_noise_coding) {
111 init_vlc(&s->hgain_vlc, HGAINVLCBITS, sizeof(ff_wma_hgain_huffbits),
112 ff_wma_hgain_huffbits, 1, 1,
113 ff_wma_hgain_huffcodes, 2, 2, 0);
116 if (s->use_exp_vlc) {
117 init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(ff_aac_scalefactor_bits), //FIXME move out of context
118 ff_aac_scalefactor_bits, 1, 1,
119 ff_aac_scalefactor_code, 4, 4, 0);
121 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 */
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,
187 float *out, float *val_max_ptr,
191 float p, q, w, v, val_max;
197 w = s->lsp_cos_table[i];
198 for(j=1;j<NB_LSP_COEFS;j+=2){
210 *val_max_ptr = val_max;
214 * decode exponents coded with LSP coefficients (same idea as Vorbis)
216 static void decode_exp_lsp(WMACodecContext *s, int ch)
218 float lsp_coefs[NB_LSP_COEFS];
221 for(i = 0; i < NB_LSP_COEFS; i++) {
222 if (i == 0 || i >= 8)
223 val = get_bits(&s->gb, 3);
225 val = get_bits(&s->gb, 4);
226 lsp_coefs[i] = ff_wma_lsp_codebook[i][val];
229 wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch],
230 s->block_len, lsp_coefs);
233 /** pow(10, i / 16.0) for i in -60..95 */
234 static const float pow_tab[] = {
235 1.7782794100389e-04, 2.0535250264571e-04,
236 2.3713737056617e-04, 2.7384196342644e-04,
237 3.1622776601684e-04, 3.6517412725484e-04,
238 4.2169650342858e-04, 4.8696752516586e-04,
239 5.6234132519035e-04, 6.4938163157621e-04,
240 7.4989420933246e-04, 8.6596432336006e-04,
241 1.0000000000000e-03, 1.1547819846895e-03,
242 1.3335214321633e-03, 1.5399265260595e-03,
243 1.7782794100389e-03, 2.0535250264571e-03,
244 2.3713737056617e-03, 2.7384196342644e-03,
245 3.1622776601684e-03, 3.6517412725484e-03,
246 4.2169650342858e-03, 4.8696752516586e-03,
247 5.6234132519035e-03, 6.4938163157621e-03,
248 7.4989420933246e-03, 8.6596432336006e-03,
249 1.0000000000000e-02, 1.1547819846895e-02,
250 1.3335214321633e-02, 1.5399265260595e-02,
251 1.7782794100389e-02, 2.0535250264571e-02,
252 2.3713737056617e-02, 2.7384196342644e-02,
253 3.1622776601684e-02, 3.6517412725484e-02,
254 4.2169650342858e-02, 4.8696752516586e-02,
255 5.6234132519035e-02, 6.4938163157621e-02,
256 7.4989420933246e-02, 8.6596432336007e-02,
257 1.0000000000000e-01, 1.1547819846895e-01,
258 1.3335214321633e-01, 1.5399265260595e-01,
259 1.7782794100389e-01, 2.0535250264571e-01,
260 2.3713737056617e-01, 2.7384196342644e-01,
261 3.1622776601684e-01, 3.6517412725484e-01,
262 4.2169650342858e-01, 4.8696752516586e-01,
263 5.6234132519035e-01, 6.4938163157621e-01,
264 7.4989420933246e-01, 8.6596432336007e-01,
265 1.0000000000000e+00, 1.1547819846895e+00,
266 1.3335214321633e+00, 1.5399265260595e+00,
267 1.7782794100389e+00, 2.0535250264571e+00,
268 2.3713737056617e+00, 2.7384196342644e+00,
269 3.1622776601684e+00, 3.6517412725484e+00,
270 4.2169650342858e+00, 4.8696752516586e+00,
271 5.6234132519035e+00, 6.4938163157621e+00,
272 7.4989420933246e+00, 8.6596432336007e+00,
273 1.0000000000000e+01, 1.1547819846895e+01,
274 1.3335214321633e+01, 1.5399265260595e+01,
275 1.7782794100389e+01, 2.0535250264571e+01,
276 2.3713737056617e+01, 2.7384196342644e+01,
277 3.1622776601684e+01, 3.6517412725484e+01,
278 4.2169650342858e+01, 4.8696752516586e+01,
279 5.6234132519035e+01, 6.4938163157621e+01,
280 7.4989420933246e+01, 8.6596432336007e+01,
281 1.0000000000000e+02, 1.1547819846895e+02,
282 1.3335214321633e+02, 1.5399265260595e+02,
283 1.7782794100389e+02, 2.0535250264571e+02,
284 2.3713737056617e+02, 2.7384196342644e+02,
285 3.1622776601684e+02, 3.6517412725484e+02,
286 4.2169650342858e+02, 4.8696752516586e+02,
287 5.6234132519035e+02, 6.4938163157621e+02,
288 7.4989420933246e+02, 8.6596432336007e+02,
289 1.0000000000000e+03, 1.1547819846895e+03,
290 1.3335214321633e+03, 1.5399265260595e+03,
291 1.7782794100389e+03, 2.0535250264571e+03,
292 2.3713737056617e+03, 2.7384196342644e+03,
293 3.1622776601684e+03, 3.6517412725484e+03,
294 4.2169650342858e+03, 4.8696752516586e+03,
295 5.6234132519035e+03, 6.4938163157621e+03,
296 7.4989420933246e+03, 8.6596432336007e+03,
297 1.0000000000000e+04, 1.1547819846895e+04,
298 1.3335214321633e+04, 1.5399265260595e+04,
299 1.7782794100389e+04, 2.0535250264571e+04,
300 2.3713737056617e+04, 2.7384196342644e+04,
301 3.1622776601684e+04, 3.6517412725484e+04,
302 4.2169650342858e+04, 4.8696752516586e+04,
303 5.6234132519035e+04, 6.4938163157621e+04,
304 7.4989420933246e+04, 8.6596432336007e+04,
305 1.0000000000000e+05, 1.1547819846895e+05,
306 1.3335214321633e+05, 1.5399265260595e+05,
307 1.7782794100389e+05, 2.0535250264571e+05,
308 2.3713737056617e+05, 2.7384196342644e+05,
309 3.1622776601684e+05, 3.6517412725484e+05,
310 4.2169650342858e+05, 4.8696752516586e+05,
311 5.6234132519035e+05, 6.4938163157621e+05,
312 7.4989420933246e+05, 8.6596432336007e+05,
316 * decode exponents coded with VLC codes
318 static int decode_exp_vlc(WMACodecContext *s, int ch)
320 int last_exp, n, code;
323 uint32_t *q, *q_end, iv;
324 const float *ptab = pow_tab + 60;
325 const uint32_t *iptab = (const uint32_t*)ptab;
327 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
328 q = (uint32_t *)s->exponents[ch];
329 q_end = q + s->block_len;
331 if (s->version == 1) {
332 last_exp = get_bits(&s->gb, 5) + 10;
334 iv = iptab[last_exp];
342 } while ((n -= 4) > 0);
347 code = get_vlc2(&s->gb, s->exp_vlc.table, EXPVLCBITS, EXPMAX);
349 av_log(s->avctx, AV_LOG_ERROR, "Exponent vlc invalid\n");
352 /* NOTE: this offset is the same as MPEG4 AAC ! */
353 last_exp += code - 60;
354 if ((unsigned)last_exp + 60 >= FF_ARRAY_ELEMS(pow_tab)) {
355 av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n",
360 iv = iptab[last_exp];
369 } while ((n -= 4) > 0);
371 s->max_exponent[ch] = max_scale;
377 * Apply MDCT window and add into output.
379 * We ensure that when the windows overlap their squared sum
380 * is always 1 (MDCT reconstruction rule).
382 static void wma_window(WMACodecContext *s, float *out)
384 float *in = s->output;
385 int block_len, bsize, n;
388 if (s->block_len_bits <= s->prev_block_len_bits) {
389 block_len = s->block_len;
390 bsize = s->frame_len_bits - s->block_len_bits;
392 s->fdsp.vector_fmul_add(out, in, s->windows[bsize],
396 block_len = 1 << s->prev_block_len_bits;
397 n = (s->block_len - block_len) / 2;
398 bsize = s->frame_len_bits - s->prev_block_len_bits;
400 s->fdsp.vector_fmul_add(out+n, in+n, s->windows[bsize],
403 memcpy(out+n+block_len, in+n+block_len, n*sizeof(float));
410 if (s->block_len_bits <= s->next_block_len_bits) {
411 block_len = s->block_len;
412 bsize = s->frame_len_bits - s->block_len_bits;
414 s->fdsp.vector_fmul_reverse(out, in, s->windows[bsize], block_len);
417 block_len = 1 << s->next_block_len_bits;
418 n = (s->block_len - block_len) / 2;
419 bsize = s->frame_len_bits - s->next_block_len_bits;
421 memcpy(out, in, n*sizeof(float));
423 s->fdsp.vector_fmul_reverse(out+n, in+n, s->windows[bsize], block_len);
425 memset(out+n+block_len, 0, n*sizeof(float));
431 * @return 0 if OK. 1 if last block of frame. return -1 if
432 * unrecorrable error.
434 static int wma_decode_block(WMACodecContext *s)
436 int n, v, a, ch, bsize;
437 int coef_nb_bits, total_gain;
438 int nb_coefs[MAX_CHANNELS];
443 tprintf(s->avctx, "***decode_block: %d:%d\n", s->frame_count - 1, s->block_num);
446 /* compute current block length */
447 if (s->use_variable_block_len) {
448 n = av_log2(s->nb_block_sizes - 1) + 1;
450 if (s->reset_block_lengths) {
451 s->reset_block_lengths = 0;
452 v = get_bits(&s->gb, n);
453 if (v >= s->nb_block_sizes){
454 av_log(s->avctx, AV_LOG_ERROR, "prev_block_len_bits %d out of range\n", s->frame_len_bits - v);
457 s->prev_block_len_bits = s->frame_len_bits - v;
458 v = get_bits(&s->gb, n);
459 if (v >= s->nb_block_sizes){
460 av_log(s->avctx, AV_LOG_ERROR, "block_len_bits %d out of range\n", s->frame_len_bits - v);
463 s->block_len_bits = s->frame_len_bits - v;
465 /* update block lengths */
466 s->prev_block_len_bits = s->block_len_bits;
467 s->block_len_bits = s->next_block_len_bits;
469 v = get_bits(&s->gb, n);
470 if (v >= s->nb_block_sizes){
471 av_log(s->avctx, AV_LOG_ERROR, "next_block_len_bits %d out of range\n", s->frame_len_bits - v);
474 s->next_block_len_bits = s->frame_len_bits - v;
476 /* fixed block len */
477 s->next_block_len_bits = s->frame_len_bits;
478 s->prev_block_len_bits = s->frame_len_bits;
479 s->block_len_bits = s->frame_len_bits;
482 if (s->frame_len_bits - s->block_len_bits >= s->nb_block_sizes){
483 av_log(s->avctx, AV_LOG_ERROR, "block_len_bits not initialized to a valid value\n");
487 /* now check if the block length is coherent with the frame length */
488 s->block_len = 1 << s->block_len_bits;
489 if ((s->block_pos + s->block_len) > s->frame_len){
490 av_log(s->avctx, AV_LOG_ERROR, "frame_len overflow\n");
494 if (s->avctx->channels == 2) {
495 s->ms_stereo = get_bits1(&s->gb);
498 for(ch = 0; ch < s->avctx->channels; ch++) {
499 a = get_bits1(&s->gb);
500 s->channel_coded[ch] = a;
504 bsize = s->frame_len_bits - s->block_len_bits;
506 /* if no channel coded, no need to go further */
507 /* XXX: fix potential framing problems */
511 /* read total gain and extract corresponding number of bits for
512 coef escape coding */
515 a = get_bits(&s->gb, 7);
521 coef_nb_bits= ff_wma_total_gain_to_bits(total_gain);
523 /* compute number of coefficients */
524 n = s->coefs_end[bsize] - s->coefs_start;
525 for(ch = 0; ch < s->avctx->channels; ch++)
529 if (s->use_noise_coding) {
531 for(ch = 0; ch < s->avctx->channels; ch++) {
532 if (s->channel_coded[ch]) {
534 n = s->exponent_high_sizes[bsize];
536 a = get_bits1(&s->gb);
537 s->high_band_coded[ch][i] = a;
538 /* if noise coding, the coefficients are not transmitted */
540 nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
544 for(ch = 0; ch < s->avctx->channels; ch++) {
545 if (s->channel_coded[ch]) {
548 n = s->exponent_high_sizes[bsize];
549 val = (int)0x80000000;
551 if (s->high_band_coded[ch][i]) {
552 if (val == (int)0x80000000) {
553 val = get_bits(&s->gb, 7) - 19;
555 code = get_vlc2(&s->gb, s->hgain_vlc.table, HGAINVLCBITS, HGAINMAX);
557 av_log(s->avctx, AV_LOG_ERROR, "hgain vlc invalid\n");
562 s->high_band_values[ch][i] = val;
569 /* exponents can be reused in short blocks. */
570 if ((s->block_len_bits == s->frame_len_bits) ||
572 for(ch = 0; ch < s->avctx->channels; ch++) {
573 if (s->channel_coded[ch]) {
574 if (s->use_exp_vlc) {
575 if (decode_exp_vlc(s, ch) < 0)
578 decode_exp_lsp(s, ch);
580 s->exponents_bsize[ch] = bsize;
585 /* parse spectral coefficients : just RLE encoding */
586 for (ch = 0; ch < s->avctx->channels; ch++) {
587 if (s->channel_coded[ch]) {
589 WMACoef* ptr = &s->coefs1[ch][0];
591 /* special VLC tables are used for ms stereo because
592 there is potentially less energy there */
593 tindex = (ch == 1 && s->ms_stereo);
594 memset(ptr, 0, s->block_len * sizeof(WMACoef));
595 ff_wma_run_level_decode(s->avctx, &s->gb, &s->coef_vlc[tindex],
596 s->level_table[tindex], s->run_table[tindex],
597 0, ptr, 0, nb_coefs[ch],
598 s->block_len, s->frame_len_bits, coef_nb_bits);
600 if (s->version == 1 && s->avctx->channels >= 2) {
601 align_get_bits(&s->gb);
607 int n4 = s->block_len / 2;
608 mdct_norm = 1.0 / (float)n4;
609 if (s->version == 1) {
610 mdct_norm *= sqrt(n4);
614 /* finally compute the MDCT coefficients */
615 for (ch = 0; ch < s->avctx->channels; ch++) {
616 if (s->channel_coded[ch]) {
618 float *coefs, *exponents, mult, mult1, noise;
619 int i, j, n, n1, last_high_band, esize;
620 float exp_power[HIGH_BAND_MAX_SIZE];
622 coefs1 = s->coefs1[ch];
623 exponents = s->exponents[ch];
624 esize = s->exponents_bsize[ch];
625 mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
627 coefs = s->coefs[ch];
628 if (s->use_noise_coding) {
630 /* very low freqs : noise */
631 for(i = 0;i < s->coefs_start; i++) {
632 *coefs++ = s->noise_table[s->noise_index] *
633 exponents[i<<bsize>>esize] * mult1;
634 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
637 n1 = s->exponent_high_sizes[bsize];
639 /* compute power of high bands */
640 exponents = s->exponents[ch] +
641 (s->high_band_start[bsize]<<bsize>>esize);
642 last_high_band = 0; /* avoid warning */
644 n = s->exponent_high_bands[s->frame_len_bits -
645 s->block_len_bits][j];
646 if (s->high_band_coded[ch][j]) {
649 for(i = 0;i < n; i++) {
650 v = exponents[i<<bsize>>esize];
653 exp_power[j] = e2 / n;
655 tprintf(s->avctx, "%d: power=%f (%d)\n", j, exp_power[j], n);
657 exponents += n<<bsize>>esize;
660 /* main freqs and high freqs */
661 exponents = s->exponents[ch] + (s->coefs_start<<bsize>>esize);
664 n = s->high_band_start[bsize] -
667 n = s->exponent_high_bands[s->frame_len_bits -
668 s->block_len_bits][j];
670 if (j >= 0 && s->high_band_coded[ch][j]) {
671 /* use noise with specified power */
672 mult1 = sqrt(exp_power[j] / exp_power[last_high_band]);
673 /* XXX: use a table */
674 mult1 = mult1 * pow(10, s->high_band_values[ch][j] * 0.05);
675 mult1 = mult1 / (s->max_exponent[ch] * s->noise_mult);
677 for(i = 0;i < n; i++) {
678 noise = s->noise_table[s->noise_index];
679 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
681 exponents[i<<bsize>>esize] * mult1;
683 exponents += n<<bsize>>esize;
685 /* coded values + small noise */
686 for(i = 0;i < n; i++) {
687 noise = s->noise_table[s->noise_index];
688 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
689 *coefs++ = ((*coefs1++) + noise) *
690 exponents[i<<bsize>>esize] * mult;
692 exponents += n<<bsize>>esize;
696 /* very high freqs : noise */
697 n = s->block_len - s->coefs_end[bsize];
698 mult1 = mult * exponents[((-1<<bsize))>>esize];
699 for(i = 0; i < n; i++) {
700 *coefs++ = s->noise_table[s->noise_index] * mult1;
701 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
704 /* XXX: optimize more */
705 for(i = 0;i < s->coefs_start; i++)
708 for(i = 0;i < n; i++) {
709 *coefs++ = coefs1[i] * exponents[i<<bsize>>esize] * mult;
711 n = s->block_len - s->coefs_end[bsize];
712 for(i = 0;i < n; i++)
719 for (ch = 0; ch < s->avctx->channels; ch++) {
720 if (s->channel_coded[ch]) {
721 dump_floats(s, "exponents", 3, s->exponents[ch], s->block_len);
722 dump_floats(s, "coefs", 1, s->coefs[ch], s->block_len);
727 if (s->ms_stereo && s->channel_coded[1]) {
728 /* nominal case for ms stereo: we do it before mdct */
729 /* no need to optimize this case because it should almost
731 if (!s->channel_coded[0]) {
732 tprintf(s->avctx, "rare ms-stereo case happened\n");
733 memset(s->coefs[0], 0, sizeof(float) * s->block_len);
734 s->channel_coded[0] = 1;
737 s->fdsp.butterflies_float(s->coefs[0], s->coefs[1], s->block_len);
741 mdct = &s->mdct_ctx[bsize];
743 for (ch = 0; ch < s->avctx->channels; ch++) {
746 n4 = s->block_len / 2;
747 if(s->channel_coded[ch]){
748 mdct->imdct_calc(mdct, s->output, s->coefs[ch]);
749 }else if(!(s->ms_stereo && ch==1))
750 memset(s->output, 0, sizeof(s->output));
752 /* multiply by the window and add in the frame */
753 index = (s->frame_len / 2) + s->block_pos - n4;
754 wma_window(s, &s->frame_out[ch][index]);
757 /* update block number */
759 s->block_pos += s->block_len;
760 if (s->block_pos >= s->frame_len)
766 /* decode a frame of frame_len samples */
767 static int wma_decode_frame(WMACodecContext *s, float **samples,
773 tprintf(s->avctx, "***decode_frame: %d size=%d\n", s->frame_count++, s->frame_len);
776 /* read each block */
780 ret = wma_decode_block(s);
787 for (ch = 0; ch < s->avctx->channels; ch++) {
788 /* copy current block to output */
789 memcpy(samples[ch] + samples_offset, s->frame_out[ch],
790 s->frame_len * sizeof(*s->frame_out[ch]));
791 /* prepare for next block */
792 memmove(&s->frame_out[ch][0], &s->frame_out[ch][s->frame_len],
793 s->frame_len * sizeof(*s->frame_out[ch]));
796 dump_floats(s, "samples", 6, samples[ch] + samples_offset, s->frame_len);
803 static int wma_decode_superframe(AVCodecContext *avctx, void *data,
804 int *got_frame_ptr, AVPacket *avpkt)
806 AVFrame *frame = data;
807 const uint8_t *buf = avpkt->data;
808 int buf_size = avpkt->size;
809 WMACodecContext *s = avctx->priv_data;
810 int nb_frames, bit_offset, i, pos, len, ret;
815 tprintf(avctx, "***decode_superframe:\n");
818 s->last_superframe_len = 0;
821 if (buf_size < avctx->block_align) {
822 av_log(avctx, AV_LOG_ERROR,
823 "Input packet size too small (%d < %d)\n",
824 buf_size, avctx->block_align);
825 return AVERROR_INVALIDDATA;
827 if(avctx->block_align)
828 buf_size = avctx->block_align;
830 init_get_bits(&s->gb, buf, buf_size*8);
832 if (s->use_bit_reservoir) {
833 /* read super frame header */
834 skip_bits(&s->gb, 4); /* super frame index */
835 nb_frames = get_bits(&s->gb, 4) - (s->last_superframe_len <= 0);
836 if (nb_frames <= 0) {
837 av_log(avctx, AV_LOG_ERROR, "nb_frames is %d\n", nb_frames);
838 return AVERROR_INVALIDDATA;
844 /* get output buffer */
845 frame->nb_samples = nb_frames * s->frame_len;
846 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
848 samples = (float **)frame->extended_data;
851 if (s->use_bit_reservoir) {
852 bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
853 if (bit_offset > get_bits_left(&s->gb)) {
854 av_log(avctx, AV_LOG_ERROR,
855 "Invalid last frame bit offset %d > buf size %d (%d)\n",
856 bit_offset, get_bits_left(&s->gb), buf_size);
860 if (s->last_superframe_len > 0) {
861 /* add bit_offset bits to last frame */
862 if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) >
863 MAX_CODED_SUPERFRAME_SIZE)
865 q = s->last_superframe + s->last_superframe_len;
868 *q++ = (get_bits)(&s->gb, 8);
872 *q++ = (get_bits)(&s->gb, len) << (8 - len);
874 memset(q, 0, FF_INPUT_BUFFER_PADDING_SIZE);
876 /* XXX: bit_offset bits into last frame */
877 init_get_bits(&s->gb, s->last_superframe, s->last_superframe_len * 8 + bit_offset);
878 /* skip unused bits */
879 if (s->last_bitoffset > 0)
880 skip_bits(&s->gb, s->last_bitoffset);
881 /* this frame is stored in the last superframe and in the
883 if (wma_decode_frame(s, samples, samples_offset) < 0)
885 samples_offset += s->frame_len;
889 /* read each frame starting from bit_offset */
890 pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
891 if (pos >= MAX_CODED_SUPERFRAME_SIZE * 8 || pos > buf_size * 8)
892 return AVERROR_INVALIDDATA;
893 init_get_bits(&s->gb, buf + (pos >> 3), (buf_size - (pos >> 3))*8);
896 skip_bits(&s->gb, len);
898 s->reset_block_lengths = 1;
899 for(i=0;i<nb_frames;i++) {
900 if (wma_decode_frame(s, samples, samples_offset) < 0)
902 samples_offset += s->frame_len;
905 /* we copy the end of the frame in the last frame buffer */
906 pos = get_bits_count(&s->gb) + ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7);
907 s->last_bitoffset = pos & 7;
909 len = buf_size - pos;
910 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) {
911 av_log(s->avctx, AV_LOG_ERROR, "len %d invalid\n", len);
914 s->last_superframe_len = len;
915 memcpy(s->last_superframe, buf + pos, len);
917 /* single frame decode */
918 if (wma_decode_frame(s, samples, samples_offset) < 0)
920 samples_offset += s->frame_len;
923 av_dlog(s->avctx, "%d %d %d %d outbytes:%td eaten:%d\n",
924 s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len,
925 (int8_t *)samples - (int8_t *)data, avctx->block_align);
931 /* when error, we reset the bit reservoir */
932 s->last_superframe_len = 0;
936 static av_cold void flush(AVCodecContext *avctx)
938 WMACodecContext *s = avctx->priv_data;
941 s->last_superframe_len= 0;
944 #if CONFIG_WMAV1_DECODER
945 AVCodec ff_wmav1_decoder = {
947 .type = AVMEDIA_TYPE_AUDIO,
948 .id = AV_CODEC_ID_WMAV1,
949 .priv_data_size = sizeof(WMACodecContext),
950 .init = wma_decode_init,
952 .decode = wma_decode_superframe,
954 .capabilities = CODEC_CAP_DR1,
955 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
956 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
957 AV_SAMPLE_FMT_NONE },
960 #if CONFIG_WMAV2_DECODER
961 AVCodec ff_wmav2_decoder = {
963 .type = AVMEDIA_TYPE_AUDIO,
964 .id = AV_CODEC_ID_WMAV2,
965 .priv_data_size = sizeof(WMACodecContext),
966 .init = wma_decode_init,
968 .decode = wma_decode_superframe,
970 .capabilities = CODEC_CAP_DR1,
971 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
972 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
973 AV_SAMPLE_FMT_NONE },