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"
37 #include "libavutil/internal.h"
38 #include "libavutil/libm.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,
54 int prec, const float *tab, int n)
58 ff_tlog(s->avctx, "%s[%d]:\n", name, n);
59 for (i = 0; i < n; i++) {
61 ff_tlog(s->avctx, "%4d: ", i);
62 ff_tlog(s->avctx, " %8.*f", prec, tab[i]);
64 ff_tlog(s->avctx, "\n");
67 ff_tlog(s->avctx, "\n");
71 static av_cold int wma_decode_init(AVCodecContext *avctx)
73 WMACodecContext *s = avctx->priv_data;
77 if (!avctx->block_align) {
78 av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
79 return AVERROR(EINVAL);
84 /* extract flag infos */
86 extradata = avctx->extradata;
87 if (avctx->codec->id == AV_CODEC_ID_WMAV1 && avctx->extradata_size >= 4)
88 flags2 = AV_RL16(extradata + 2);
89 else if (avctx->codec->id == AV_CODEC_ID_WMAV2 && avctx->extradata_size >= 6)
90 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);
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);
126 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
132 * compute x^-0.25 with an exponent and mantissa table. We use linear
133 * interpolation to reduce the mantissa table size at a small speed
134 * expense (linear interpolation approximately doubles the number of
135 * bits of precision).
137 static inline float pow_m1_4(WMACodecContext *s, float x)
148 m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
149 /* build interpolation scale: 1 <= t < 2. */
150 t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
151 a = s->lsp_pow_m_table1[m];
152 b = s->lsp_pow_m_table2[m];
153 return s->lsp_pow_e_table[e] * (a + b * t.f);
156 static av_cold void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len)
161 wdel = M_PI / frame_len;
162 for (i = 0; i < frame_len; i++)
163 s->lsp_cos_table[i] = 2.0f * cos(wdel * i);
165 /* tables for x^-0.25 computation */
166 for (i = 0; i < 256; i++) {
168 s->lsp_pow_e_table[i] = exp2f(e * -0.25);
171 /* NOTE: these two tables are needed to avoid two operations in
174 for (i = (1 << LSP_POW_BITS) - 1; i >= 0; i--) {
175 m = (1 << LSP_POW_BITS) + i;
176 a = (float) m * (0.5 / (1 << LSP_POW_BITS));
178 s->lsp_pow_m_table1[i] = 2 * a - b;
179 s->lsp_pow_m_table2[i] = b - a;
185 * NOTE: We use the same code as Vorbis here
186 * @todo optimize it further with SSE/3Dnow
188 static void wma_lsp_to_curve(WMACodecContext *s, float *out, float *val_max_ptr,
192 float p, q, w, v, val_max;
195 for (i = 0; i < n; i++) {
198 w = s->lsp_cos_table[i];
199 for (j = 1; j < NB_LSP_COEFS; j += 2) {
211 *val_max_ptr = val_max;
215 * decode exponents coded with LSP coefficients (same idea as Vorbis)
217 static void decode_exp_lsp(WMACodecContext *s, int ch)
219 float lsp_coefs[NB_LSP_COEFS];
222 for (i = 0; i < NB_LSP_COEFS; i++) {
223 if (i == 0 || i >= 8)
224 val = get_bits(&s->gb, 3);
226 val = get_bits(&s->gb, 4);
227 lsp_coefs[i] = ff_wma_lsp_codebook[i][val];
230 wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch],
231 s->block_len, lsp_coefs);
234 /** pow(10, i / 16.0) for i in -60..95 */
235 static const float pow_tab[] = {
236 1.7782794100389e-04, 2.0535250264571e-04,
237 2.3713737056617e-04, 2.7384196342644e-04,
238 3.1622776601684e-04, 3.6517412725484e-04,
239 4.2169650342858e-04, 4.8696752516586e-04,
240 5.6234132519035e-04, 6.4938163157621e-04,
241 7.4989420933246e-04, 8.6596432336006e-04,
242 1.0000000000000e-03, 1.1547819846895e-03,
243 1.3335214321633e-03, 1.5399265260595e-03,
244 1.7782794100389e-03, 2.0535250264571e-03,
245 2.3713737056617e-03, 2.7384196342644e-03,
246 3.1622776601684e-03, 3.6517412725484e-03,
247 4.2169650342858e-03, 4.8696752516586e-03,
248 5.6234132519035e-03, 6.4938163157621e-03,
249 7.4989420933246e-03, 8.6596432336006e-03,
250 1.0000000000000e-02, 1.1547819846895e-02,
251 1.3335214321633e-02, 1.5399265260595e-02,
252 1.7782794100389e-02, 2.0535250264571e-02,
253 2.3713737056617e-02, 2.7384196342644e-02,
254 3.1622776601684e-02, 3.6517412725484e-02,
255 4.2169650342858e-02, 4.8696752516586e-02,
256 5.6234132519035e-02, 6.4938163157621e-02,
257 7.4989420933246e-02, 8.6596432336007e-02,
258 1.0000000000000e-01, 1.1547819846895e-01,
259 1.3335214321633e-01, 1.5399265260595e-01,
260 1.7782794100389e-01, 2.0535250264571e-01,
261 2.3713737056617e-01, 2.7384196342644e-01,
262 3.1622776601684e-01, 3.6517412725484e-01,
263 4.2169650342858e-01, 4.8696752516586e-01,
264 5.6234132519035e-01, 6.4938163157621e-01,
265 7.4989420933246e-01, 8.6596432336007e-01,
266 1.0000000000000e+00, 1.1547819846895e+00,
267 1.3335214321633e+00, 1.5399265260595e+00,
268 1.7782794100389e+00, 2.0535250264571e+00,
269 2.3713737056617e+00, 2.7384196342644e+00,
270 3.1622776601684e+00, 3.6517412725484e+00,
271 4.2169650342858e+00, 4.8696752516586e+00,
272 5.6234132519035e+00, 6.4938163157621e+00,
273 7.4989420933246e+00, 8.6596432336007e+00,
274 1.0000000000000e+01, 1.1547819846895e+01,
275 1.3335214321633e+01, 1.5399265260595e+01,
276 1.7782794100389e+01, 2.0535250264571e+01,
277 2.3713737056617e+01, 2.7384196342644e+01,
278 3.1622776601684e+01, 3.6517412725484e+01,
279 4.2169650342858e+01, 4.8696752516586e+01,
280 5.6234132519035e+01, 6.4938163157621e+01,
281 7.4989420933246e+01, 8.6596432336007e+01,
282 1.0000000000000e+02, 1.1547819846895e+02,
283 1.3335214321633e+02, 1.5399265260595e+02,
284 1.7782794100389e+02, 2.0535250264571e+02,
285 2.3713737056617e+02, 2.7384196342644e+02,
286 3.1622776601684e+02, 3.6517412725484e+02,
287 4.2169650342858e+02, 4.8696752516586e+02,
288 5.6234132519035e+02, 6.4938163157621e+02,
289 7.4989420933246e+02, 8.6596432336007e+02,
290 1.0000000000000e+03, 1.1547819846895e+03,
291 1.3335214321633e+03, 1.5399265260595e+03,
292 1.7782794100389e+03, 2.0535250264571e+03,
293 2.3713737056617e+03, 2.7384196342644e+03,
294 3.1622776601684e+03, 3.6517412725484e+03,
295 4.2169650342858e+03, 4.8696752516586e+03,
296 5.6234132519035e+03, 6.4938163157621e+03,
297 7.4989420933246e+03, 8.6596432336007e+03,
298 1.0000000000000e+04, 1.1547819846895e+04,
299 1.3335214321633e+04, 1.5399265260595e+04,
300 1.7782794100389e+04, 2.0535250264571e+04,
301 2.3713737056617e+04, 2.7384196342644e+04,
302 3.1622776601684e+04, 3.6517412725484e+04,
303 4.2169650342858e+04, 4.8696752516586e+04,
304 5.6234132519035e+04, 6.4938163157621e+04,
305 7.4989420933246e+04, 8.6596432336007e+04,
306 1.0000000000000e+05, 1.1547819846895e+05,
307 1.3335214321633e+05, 1.5399265260595e+05,
308 1.7782794100389e+05, 2.0535250264571e+05,
309 2.3713737056617e+05, 2.7384196342644e+05,
310 3.1622776601684e+05, 3.6517412725484e+05,
311 4.2169650342858e+05, 4.8696752516586e+05,
312 5.6234132519035e+05, 6.4938163157621e+05,
313 7.4989420933246e+05, 8.6596432336007e+05,
317 * decode exponents coded with VLC codes
319 static int decode_exp_vlc(WMACodecContext *s, int ch)
321 int last_exp, n, code;
324 uint32_t *q, *q_end, iv;
325 const float *ptab = pow_tab + 60;
326 const uint32_t *iptab = (const uint32_t *) ptab;
328 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
329 q = (uint32_t *) s->exponents[ch];
330 q_end = q + s->block_len;
332 if (s->version == 1) {
333 last_exp = get_bits(&s->gb, 5) + 10;
335 iv = iptab[last_exp];
343 } while ((n -= 4) > 0);
348 code = get_vlc2(&s->gb, s->exp_vlc.table, EXPVLCBITS, EXPMAX);
350 av_log(s->avctx, AV_LOG_ERROR, "Exponent vlc invalid\n");
353 /* NOTE: this offset is the same as MPEG4 AAC ! */
354 last_exp += code - 60;
355 if ((unsigned) last_exp + 60 >= FF_ARRAY_ELEMS(pow_tab)) {
356 av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n",
361 iv = iptab[last_exp];
370 } while ((n -= 4) > 0);
372 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],
395 block_len = 1 << s->prev_block_len_bits;
396 n = (s->block_len - block_len) / 2;
397 bsize = s->frame_len_bits - s->prev_block_len_bits;
399 s->fdsp->vector_fmul_add(out + n, in + n, s->windows[bsize],
402 memcpy(out + n + block_len, in + n + block_len, n * sizeof(float));
409 if (s->block_len_bits <= s->next_block_len_bits) {
410 block_len = s->block_len;
411 bsize = s->frame_len_bits - s->block_len_bits;
413 s->fdsp->vector_fmul_reverse(out, in, s->windows[bsize], block_len);
415 block_len = 1 << s->next_block_len_bits;
416 n = (s->block_len - block_len) / 2;
417 bsize = s->frame_len_bits - s->next_block_len_bits;
419 memcpy(out, in, n * sizeof(float));
421 s->fdsp->vector_fmul_reverse(out + n, in + n, s->windows[bsize],
424 memset(out + n + block_len, 0, n * sizeof(float));
429 * @return 0 if OK. 1 if last block of frame. return -1 if
430 * unrecorrable error.
432 static int wma_decode_block(WMACodecContext *s)
434 int n, v, a, ch, bsize;
435 int coef_nb_bits, total_gain;
436 int nb_coefs[MAX_CHANNELS];
441 ff_tlog(s->avctx, "***decode_block: %d:%d\n",
442 s->frame_count - 1, s->block_num);
445 /* compute current block length */
446 if (s->use_variable_block_len) {
447 n = av_log2(s->nb_block_sizes - 1) + 1;
449 if (s->reset_block_lengths) {
450 s->reset_block_lengths = 0;
451 v = get_bits(&s->gb, n);
452 if (v >= s->nb_block_sizes) {
453 av_log(s->avctx, AV_LOG_ERROR,
454 "prev_block_len_bits %d out of range\n",
455 s->frame_len_bits - v);
458 s->prev_block_len_bits = s->frame_len_bits - v;
459 v = get_bits(&s->gb, n);
460 if (v >= s->nb_block_sizes) {
461 av_log(s->avctx, AV_LOG_ERROR,
462 "block_len_bits %d out of range\n",
463 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,
475 "next_block_len_bits %d out of range\n",
476 s->frame_len_bits - v);
479 s->next_block_len_bits = s->frame_len_bits - v;
481 /* fixed block len */
482 s->next_block_len_bits = s->frame_len_bits;
483 s->prev_block_len_bits = s->frame_len_bits;
484 s->block_len_bits = s->frame_len_bits;
487 if (s->frame_len_bits - s->block_len_bits >= s->nb_block_sizes){
488 av_log(s->avctx, AV_LOG_ERROR, "block_len_bits not initialized to a valid value\n");
492 /* now check if the block length is coherent with the frame length */
493 s->block_len = 1 << s->block_len_bits;
494 if ((s->block_pos + s->block_len) > s->frame_len) {
495 av_log(s->avctx, AV_LOG_ERROR, "frame_len overflow\n");
499 if (s->avctx->channels == 2)
500 s->ms_stereo = get_bits1(&s->gb);
502 for (ch = 0; ch < s->avctx->channels; ch++) {
503 a = get_bits1(&s->gb);
504 s->channel_coded[ch] = a;
508 bsize = s->frame_len_bits - s->block_len_bits;
510 /* if no channel coded, no need to go further */
511 /* XXX: fix potential framing problems */
515 /* read total gain and extract corresponding number of bits for
516 * coef escape coding */
519 if (get_bits_left(&s->gb) < 7) {
520 av_log(s->avctx, AV_LOG_ERROR, "total_gain overread\n");
521 return AVERROR_INVALIDDATA;
523 a = get_bits(&s->gb, 7);
529 coef_nb_bits = ff_wma_total_gain_to_bits(total_gain);
531 /* compute number of coefficients */
532 n = s->coefs_end[bsize] - s->coefs_start;
533 for (ch = 0; ch < s->avctx->channels; ch++)
537 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];
542 for (i = 0; i < n; i++) {
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;
557 for (i = 0; i < n; i++) {
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,
563 HGAINVLCBITS, HGAINMAX);
565 av_log(s->avctx, AV_LOG_ERROR,
566 "hgain vlc invalid\n");
571 s->high_band_values[ch][i] = val;
578 /* exponents can be reused in short blocks. */
579 if ((s->block_len_bits == s->frame_len_bits) || get_bits1(&s->gb)) {
580 for (ch = 0; ch < s->avctx->channels; ch++) {
581 if (s->channel_coded[ch]) {
582 if (s->use_exp_vlc) {
583 if (decode_exp_vlc(s, ch) < 0)
586 decode_exp_lsp(s, ch);
588 s->exponents_bsize[ch] = bsize;
593 /* parse spectral coefficients : just RLE encoding */
594 for (ch = 0; ch < s->avctx->channels; ch++) {
595 if (s->channel_coded[ch]) {
597 WMACoef *ptr = &s->coefs1[ch][0];
599 /* special VLC tables are used for ms stereo because
600 * there is potentially less energy there */
601 tindex = (ch == 1 && s->ms_stereo);
602 memset(ptr, 0, s->block_len * sizeof(WMACoef));
603 ff_wma_run_level_decode(s->avctx, &s->gb, &s->coef_vlc[tindex],
604 s->level_table[tindex], s->run_table[tindex],
605 0, ptr, 0, nb_coefs[ch],
606 s->block_len, s->frame_len_bits, coef_nb_bits);
608 if (s->version == 1 && s->avctx->channels >= 2)
609 align_get_bits(&s->gb);
614 int n4 = s->block_len / 2;
615 mdct_norm = 1.0 / (float) n4;
617 mdct_norm *= sqrt(n4);
620 /* finally compute the MDCT coefficients */
621 for (ch = 0; ch < s->avctx->channels; ch++) {
622 if (s->channel_coded[ch]) {
624 float *coefs, *exponents, mult, mult1, noise;
625 int i, j, n, n1, last_high_band, esize;
626 float exp_power[HIGH_BAND_MAX_SIZE];
628 coefs1 = s->coefs1[ch];
629 exponents = s->exponents[ch];
630 esize = s->exponents_bsize[ch];
631 mult = ff_exp10(total_gain * 0.05) / s->max_exponent[ch];
633 coefs = s->coefs[ch];
634 if (s->use_noise_coding) {
636 /* very low freqs : noise */
637 for (i = 0; i < s->coefs_start; i++) {
638 *coefs++ = s->noise_table[s->noise_index] *
639 exponents[i << bsize >> esize] * mult1;
640 s->noise_index = (s->noise_index + 1) &
641 (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 */
650 for (j = 0; j < n1; j++) {
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 ff_tlog(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);
669 for (j = -1; j < n1; j++) {
671 n = s->high_band_start[bsize] - s->coefs_start;
673 n = s->exponent_high_bands[s->frame_len_bits -
674 s->block_len_bits][j];
675 if (j >= 0 && s->high_band_coded[ch][j]) {
676 /* use noise with specified power */
677 mult1 = sqrt(exp_power[j] / exp_power[last_high_band]);
678 /* XXX: use a table */
679 mult1 = mult1 * ff_exp10(s->high_band_values[ch][j] * 0.05);
680 mult1 = mult1 / (s->max_exponent[ch] * s->noise_mult);
682 for (i = 0; i < n; i++) {
683 noise = s->noise_table[s->noise_index];
684 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
685 *coefs++ = noise * exponents[i << bsize >> esize] * mult1;
687 exponents += n << bsize >> esize;
689 /* coded values + small noise */
690 for (i = 0; i < n; i++) {
691 noise = s->noise_table[s->noise_index];
692 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
693 *coefs++ = ((*coefs1++) + noise) *
694 exponents[i << bsize >> esize] * mult;
696 exponents += n << bsize >> esize;
700 /* very high freqs : noise */
701 n = s->block_len - s->coefs_end[bsize];
702 mult1 = mult * exponents[(-(1 << bsize)) >> esize];
703 for (i = 0; i < n; i++) {
704 *coefs++ = s->noise_table[s->noise_index] * mult1;
705 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
708 /* XXX: optimize more */
709 for (i = 0; i < s->coefs_start; i++)
712 for (i = 0; i < n; i++)
713 *coefs++ = coefs1[i] * exponents[i << bsize >> esize] * mult;
714 n = s->block_len - s->coefs_end[bsize];
715 for (i = 0; i < n; i++)
722 for (ch = 0; ch < s->avctx->channels; ch++) {
723 if (s->channel_coded[ch]) {
724 dump_floats(s, "exponents", 3, s->exponents[ch], s->block_len);
725 dump_floats(s, "coefs", 1, s->coefs[ch], s->block_len);
730 if (s->ms_stereo && s->channel_coded[1]) {
731 /* nominal case for ms stereo: we do it before mdct */
732 /* no need to optimize this case because it should almost
734 if (!s->channel_coded[0]) {
735 ff_tlog(s->avctx, "rare ms-stereo case happened\n");
736 memset(s->coefs[0], 0, sizeof(float) * s->block_len);
737 s->channel_coded[0] = 1;
740 s->fdsp->butterflies_float(s->coefs[0], s->coefs[1], s->block_len);
744 mdct = &s->mdct_ctx[bsize];
746 for (ch = 0; ch < s->avctx->channels; ch++) {
749 n4 = s->block_len / 2;
750 if (s->channel_coded[ch])
751 mdct->imdct_calc(mdct, s->output, s->coefs[ch]);
752 else if (!(s->ms_stereo && ch == 1))
753 memset(s->output, 0, sizeof(s->output));
755 /* multiply by the window and add in the frame */
756 index = (s->frame_len / 2) + s->block_pos - n4;
757 wma_window(s, &s->frame_out[ch][index]);
760 /* update block number */
762 s->block_pos += s->block_len;
763 if (s->block_pos >= s->frame_len)
769 /* decode a frame of frame_len samples */
770 static int wma_decode_frame(WMACodecContext *s, float **samples,
776 ff_tlog(s->avctx, "***decode_frame: %d size=%d\n",
777 s->frame_count++, s->frame_len);
780 /* read each block */
784 ret = wma_decode_block(s);
791 for (ch = 0; ch < s->avctx->channels; ch++) {
792 /* copy current block to output */
793 memcpy(samples[ch] + samples_offset, s->frame_out[ch],
794 s->frame_len * sizeof(*s->frame_out[ch]));
795 /* prepare for next block */
796 memmove(&s->frame_out[ch][0], &s->frame_out[ch][s->frame_len],
797 s->frame_len * sizeof(*s->frame_out[ch]));
800 dump_floats(s, "samples", 6, samples[ch] + samples_offset,
808 static int wma_decode_superframe(AVCodecContext *avctx, void *data,
809 int *got_frame_ptr, AVPacket *avpkt)
811 AVFrame *frame = data;
812 const uint8_t *buf = avpkt->data;
813 int buf_size = avpkt->size;
814 WMACodecContext *s = avctx->priv_data;
815 int nb_frames, bit_offset, i, pos, len, ret;
820 ff_tlog(avctx, "***decode_superframe:\n");
823 s->last_superframe_len = 0;
826 if (buf_size < avctx->block_align) {
827 av_log(avctx, AV_LOG_ERROR,
828 "Input packet size too small (%d < %d)\n",
829 buf_size, avctx->block_align);
830 return AVERROR_INVALIDDATA;
832 if (avctx->block_align)
833 buf_size = avctx->block_align;
835 init_get_bits(&s->gb, buf, buf_size * 8);
837 if (s->use_bit_reservoir) {
838 /* read super frame header */
839 skip_bits(&s->gb, 4); /* super frame index */
840 nb_frames = get_bits(&s->gb, 4) - (s->last_superframe_len <= 0);
841 if (nb_frames <= 0) {
842 int is_error = nb_frames < 0 || get_bits_left(&s->gb) <= 8;
843 av_log(avctx, is_error ? AV_LOG_ERROR : AV_LOG_WARNING,
844 "nb_frames is %d bits left %d\n",
845 nb_frames, get_bits_left(&s->gb));
847 return AVERROR_INVALIDDATA;
849 if ((s->last_superframe_len + buf_size - 1) >
850 MAX_CODED_SUPERFRAME_SIZE)
853 q = s->last_superframe + s->last_superframe_len;
856 *q++ = get_bits (&s->gb, 8);
859 memset(q, 0, AV_INPUT_BUFFER_PADDING_SIZE);
861 s->last_superframe_len += 8*buf_size - 8;
862 // s->reset_block_lengths = 1; //XXX is this needed ?
869 /* get output buffer */
870 frame->nb_samples = nb_frames * s->frame_len;
871 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
873 samples = (float **) frame->extended_data;
876 if (s->use_bit_reservoir) {
877 bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
878 if (bit_offset > get_bits_left(&s->gb)) {
879 av_log(avctx, AV_LOG_ERROR,
880 "Invalid last frame bit offset %d > buf size %d (%d)\n",
881 bit_offset, get_bits_left(&s->gb), buf_size);
885 if (s->last_superframe_len > 0) {
886 /* add bit_offset bits to last frame */
887 if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) >
888 MAX_CODED_SUPERFRAME_SIZE)
890 q = s->last_superframe + s->last_superframe_len;
893 *q++ = (get_bits) (&s->gb, 8);
897 *q++ = (get_bits) (&s->gb, len) << (8 - len);
898 memset(q, 0, AV_INPUT_BUFFER_PADDING_SIZE);
900 /* XXX: bit_offset bits into last frame */
901 init_get_bits(&s->gb, s->last_superframe,
902 s->last_superframe_len * 8 + bit_offset);
903 /* skip unused bits */
904 if (s->last_bitoffset > 0)
905 skip_bits(&s->gb, s->last_bitoffset);
906 /* this frame is stored in the last superframe and in the
908 if (wma_decode_frame(s, samples, samples_offset) < 0)
910 samples_offset += s->frame_len;
914 /* read each frame starting from bit_offset */
915 pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
916 if (pos >= MAX_CODED_SUPERFRAME_SIZE * 8 || pos > buf_size * 8)
917 return AVERROR_INVALIDDATA;
918 init_get_bits(&s->gb, buf + (pos >> 3), (buf_size - (pos >> 3)) * 8);
921 skip_bits(&s->gb, len);
923 s->reset_block_lengths = 1;
924 for (i = 0; i < nb_frames; i++) {
925 if (wma_decode_frame(s, samples, samples_offset) < 0)
927 samples_offset += s->frame_len;
930 /* we copy the end of the frame in the last frame buffer */
931 pos = get_bits_count(&s->gb) +
932 ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7);
933 s->last_bitoffset = pos & 7;
935 len = buf_size - pos;
936 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) {
937 av_log(s->avctx, AV_LOG_ERROR, "len %d invalid\n", len);
940 s->last_superframe_len = len;
941 memcpy(s->last_superframe, buf + pos, len);
943 /* single frame decode */
944 if (wma_decode_frame(s, samples, samples_offset) < 0)
946 samples_offset += s->frame_len;
949 ff_dlog(s->avctx, "%d %d %d %d outbytes:%"PTRDIFF_SPECIFIER" eaten:%d\n",
950 s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len,
951 (int8_t *) samples - (int8_t *) data, avctx->block_align);
958 /* when error, we reset the bit reservoir */
959 s->last_superframe_len = 0;
963 static av_cold void flush(AVCodecContext *avctx)
965 WMACodecContext *s = avctx->priv_data;
968 s->last_superframe_len = 0;
971 #if CONFIG_WMAV1_DECODER
972 AVCodec ff_wmav1_decoder = {
974 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
975 .type = AVMEDIA_TYPE_AUDIO,
976 .id = AV_CODEC_ID_WMAV1,
977 .priv_data_size = sizeof(WMACodecContext),
978 .init = wma_decode_init,
980 .decode = wma_decode_superframe,
982 .capabilities = AV_CODEC_CAP_DR1,
983 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
984 AV_SAMPLE_FMT_NONE },
987 #if CONFIG_WMAV2_DECODER
988 AVCodec ff_wmav2_decoder = {
990 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
991 .type = AVMEDIA_TYPE_AUDIO,
992 .id = AV_CODEC_ID_WMAV2,
993 .priv_data_size = sizeof(WMACodecContext),
994 .init = wma_decode_init,
996 .decode = wma_decode_superframe,
998 .capabilities = AV_CODEC_CAP_DR1,
999 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
1000 AV_SAMPLE_FMT_NONE },