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/ffmath.h"
44 #define EXPMAX ((19 + EXPVLCBITS - 1) / EXPVLCBITS)
46 #define HGAINVLCBITS 9
47 #define HGAINMAX ((13 + HGAINVLCBITS - 1) / HGAINVLCBITS)
49 static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len);
52 static void dump_floats(WMACodecContext *s, const char *name,
53 int prec, const float *tab, int n)
57 ff_tlog(s->avctx, "%s[%d]:\n", name, n);
58 for (i = 0; i < n; i++) {
60 ff_tlog(s->avctx, "%4d: ", i);
61 ff_tlog(s->avctx, " %8.*f", prec, tab[i]);
63 ff_tlog(s->avctx, "\n");
66 ff_tlog(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 info */
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);
91 s->use_exp_vlc = flags2 & 0x0001;
92 s->use_bit_reservoir = flags2 & 0x0002;
93 s->use_variable_block_len = flags2 & 0x0004;
95 if (avctx->codec->id == AV_CODEC_ID_WMAV2 && avctx->extradata_size >= 8){
96 if (AV_RL16(extradata+4)==0xd && s->use_variable_block_len){
97 av_log(avctx, AV_LOG_WARNING, "Disabling use_variable_block_len, if this fails contact the ffmpeg developers and send us the file\n");
98 s->use_variable_block_len= 0; // this fixes issue1503
102 for (i=0; i<MAX_CHANNELS; i++)
103 s->max_exponent[i] = 1.0;
105 if (ff_wma_init(avctx, flags2) < 0)
109 for (i = 0; i < s->nb_block_sizes; i++)
110 ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 1, 1.0 / 32768.0);
112 if (s->use_noise_coding) {
113 init_vlc(&s->hgain_vlc, HGAINVLCBITS, sizeof(ff_wma_hgain_huffbits),
114 ff_wma_hgain_huffbits, 1, 1,
115 ff_wma_hgain_huffcodes, 2, 2, 0);
119 init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(ff_aac_scalefactor_bits), // FIXME move out of context
120 ff_aac_scalefactor_bits, 1, 1,
121 ff_aac_scalefactor_code, 4, 4, 0);
123 wma_lsp_to_curve_init(s, s->frame_len);
125 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
131 * compute x^-0.25 with an exponent and mantissa table. We use linear
132 * interpolation to reduce the mantissa table size at a small speed
133 * expense (linear interpolation approximately doubles the number of
134 * bits of precision).
136 static inline float pow_m1_4(WMACodecContext *s, float x)
147 m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
148 /* build interpolation scale: 1 <= t < 2. */
149 t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
150 a = s->lsp_pow_m_table1[m];
151 b = s->lsp_pow_m_table2[m];
152 return s->lsp_pow_e_table[e] * (a + b * t.f);
155 static av_cold void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len)
160 wdel = M_PI / frame_len;
161 for (i = 0; i < frame_len; i++)
162 s->lsp_cos_table[i] = 2.0f * cos(wdel * i);
164 /* tables for x^-0.25 computation */
165 for (i = 0; i < 256; i++) {
167 s->lsp_pow_e_table[i] = exp2f(e * -0.25);
170 /* NOTE: these two tables are needed to avoid two operations in
173 for (i = (1 << LSP_POW_BITS) - 1; i >= 0; i--) {
174 m = (1 << LSP_POW_BITS) + i;
175 a = (float) m * (0.5 / (1 << LSP_POW_BITS));
177 s->lsp_pow_m_table1[i] = 2 * a - b;
178 s->lsp_pow_m_table2[i] = b - a;
184 * NOTE: We use the same code as Vorbis here
185 * @todo optimize it further with SSE/3Dnow
187 static void wma_lsp_to_curve(WMACodecContext *s, float *out, float *val_max_ptr,
191 float p, q, w, v, val_max;
194 for (i = 0; i < n; i++) {
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);
348 /* NOTE: this offset is the same as MPEG-4 AAC! */
349 last_exp += code - 60;
350 if ((unsigned) last_exp + 60 >= FF_ARRAY_ELEMS(pow_tab)) {
351 av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n",
356 iv = iptab[last_exp];
365 } while ((n -= 4) > 0);
367 s->max_exponent[ch] = max_scale;
372 * Apply MDCT window and add into output.
374 * We ensure that when the windows overlap their squared sum
375 * is always 1 (MDCT reconstruction rule).
377 static void wma_window(WMACodecContext *s, float *out)
379 float *in = s->output;
380 int block_len, bsize, n;
383 if (s->block_len_bits <= s->prev_block_len_bits) {
384 block_len = s->block_len;
385 bsize = s->frame_len_bits - s->block_len_bits;
387 s->fdsp->vector_fmul_add(out, in, s->windows[bsize],
390 block_len = 1 << s->prev_block_len_bits;
391 n = (s->block_len - block_len) / 2;
392 bsize = s->frame_len_bits - s->prev_block_len_bits;
394 s->fdsp->vector_fmul_add(out + n, in + n, s->windows[bsize],
397 memcpy(out + n + block_len, in + n + block_len, n * sizeof(float));
404 if (s->block_len_bits <= s->next_block_len_bits) {
405 block_len = s->block_len;
406 bsize = s->frame_len_bits - s->block_len_bits;
408 s->fdsp->vector_fmul_reverse(out, in, s->windows[bsize], block_len);
410 block_len = 1 << s->next_block_len_bits;
411 n = (s->block_len - block_len) / 2;
412 bsize = s->frame_len_bits - s->next_block_len_bits;
414 memcpy(out, in, n * sizeof(float));
416 s->fdsp->vector_fmul_reverse(out + n, in + n, s->windows[bsize],
419 memset(out + n + block_len, 0, n * sizeof(float));
424 * @return 0 if OK. 1 if last block of frame. return -1 if
425 * unrecoverable error.
427 static int wma_decode_block(WMACodecContext *s)
429 int n, v, a, ch, bsize;
430 int coef_nb_bits, total_gain;
431 int nb_coefs[MAX_CHANNELS];
436 ff_tlog(s->avctx, "***decode_block: %d:%d\n",
437 s->frame_count - 1, s->block_num);
440 /* compute current block length */
441 if (s->use_variable_block_len) {
442 n = av_log2(s->nb_block_sizes - 1) + 1;
444 if (s->reset_block_lengths) {
445 s->reset_block_lengths = 0;
446 v = get_bits(&s->gb, n);
447 if (v >= s->nb_block_sizes) {
448 av_log(s->avctx, AV_LOG_ERROR,
449 "prev_block_len_bits %d out of range\n",
450 s->frame_len_bits - v);
453 s->prev_block_len_bits = s->frame_len_bits - v;
454 v = get_bits(&s->gb, n);
455 if (v >= s->nb_block_sizes) {
456 av_log(s->avctx, AV_LOG_ERROR,
457 "block_len_bits %d out of range\n",
458 s->frame_len_bits - v);
461 s->block_len_bits = s->frame_len_bits - v;
463 /* update block lengths */
464 s->prev_block_len_bits = s->block_len_bits;
465 s->block_len_bits = s->next_block_len_bits;
467 v = get_bits(&s->gb, n);
468 if (v >= s->nb_block_sizes) {
469 av_log(s->avctx, AV_LOG_ERROR,
470 "next_block_len_bits %d out of range\n",
471 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);
497 for (ch = 0; ch < s->avctx->channels; ch++) {
498 a = get_bits1(&s->gb);
499 s->channel_coded[ch] = a;
503 bsize = s->frame_len_bits - s->block_len_bits;
505 /* if no channel coded, no need to go further */
506 /* XXX: fix potential framing problems */
510 /* read total gain and extract corresponding number of bits for
511 * coef escape coding */
514 if (get_bits_left(&s->gb) < 7) {
515 av_log(s->avctx, AV_LOG_ERROR, "total_gain overread\n");
516 return AVERROR_INVALIDDATA;
518 a = get_bits(&s->gb, 7);
524 coef_nb_bits = ff_wma_total_gain_to_bits(total_gain);
526 /* compute number of coefficients */
527 n = s->coefs_end[bsize] - s->coefs_start;
528 for (ch = 0; ch < s->avctx->channels; ch++)
532 if (s->use_noise_coding) {
533 for (ch = 0; ch < s->avctx->channels; ch++) {
534 if (s->channel_coded[ch]) {
536 n = s->exponent_high_sizes[bsize];
537 for (i = 0; i < n; i++) {
538 a = get_bits1(&s->gb);
539 s->high_band_coded[ch][i] = a;
540 /* if noise coding, the coefficients are not transmitted */
542 nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
546 for (ch = 0; ch < s->avctx->channels; ch++) {
547 if (s->channel_coded[ch]) {
550 n = s->exponent_high_sizes[bsize];
551 val = (int) 0x80000000;
552 for (i = 0; i < n; i++) {
553 if (s->high_band_coded[ch][i]) {
554 if (val == (int) 0x80000000) {
555 val = get_bits(&s->gb, 7) - 19;
557 code = get_vlc2(&s->gb, s->hgain_vlc.table,
558 HGAINVLCBITS, HGAINMAX);
561 s->high_band_values[ch][i] = val;
568 /* exponents can be reused in short blocks. */
569 if ((s->block_len_bits == s->frame_len_bits) || get_bits1(&s->gb)) {
570 for (ch = 0; ch < s->avctx->channels; ch++) {
571 if (s->channel_coded[ch]) {
572 if (s->use_exp_vlc) {
573 if (decode_exp_vlc(s, ch) < 0)
576 decode_exp_lsp(s, ch);
578 s->exponents_bsize[ch] = bsize;
579 s->exponents_initialized[ch] = 1;
584 for (ch = 0; ch < s->avctx->channels; ch++) {
585 if (s->channel_coded[ch] && !s->exponents_initialized[ch])
586 return AVERROR_INVALIDDATA;
589 /* parse spectral coefficients : just RLE encoding */
590 for (ch = 0; ch < s->avctx->channels; ch++) {
591 if (s->channel_coded[ch]) {
593 WMACoef *ptr = &s->coefs1[ch][0];
595 /* special VLC tables are used for ms stereo because
596 * there is potentially less energy there */
597 tindex = (ch == 1 && s->ms_stereo);
598 memset(ptr, 0, s->block_len * sizeof(WMACoef));
599 ff_wma_run_level_decode(s->avctx, &s->gb, &s->coef_vlc[tindex],
600 s->level_table[tindex], s->run_table[tindex],
601 0, ptr, 0, nb_coefs[ch],
602 s->block_len, s->frame_len_bits, coef_nb_bits);
604 if (s->version == 1 && s->avctx->channels >= 2)
605 align_get_bits(&s->gb);
610 int n4 = s->block_len / 2;
611 mdct_norm = 1.0 / (float) n4;
613 mdct_norm *= sqrt(n4);
616 /* finally compute the MDCT coefficients */
617 for (ch = 0; ch < s->avctx->channels; ch++) {
618 if (s->channel_coded[ch]) {
620 float *coefs, *exponents, mult, mult1, noise;
621 int i, j, n, n1, last_high_band, esize;
622 float exp_power[HIGH_BAND_MAX_SIZE];
624 coefs1 = s->coefs1[ch];
625 exponents = s->exponents[ch];
626 esize = s->exponents_bsize[ch];
627 mult = ff_exp10(total_gain * 0.05) / s->max_exponent[ch];
629 coefs = s->coefs[ch];
630 if (s->use_noise_coding) {
632 /* very low freqs : noise */
633 for (i = 0; i < s->coefs_start; i++) {
634 *coefs++ = s->noise_table[s->noise_index] *
635 exponents[i << bsize >> esize] * mult1;
636 s->noise_index = (s->noise_index + 1) &
637 (NOISE_TAB_SIZE - 1);
640 n1 = s->exponent_high_sizes[bsize];
642 /* compute power of high bands */
643 exponents = s->exponents[ch] +
644 (s->high_band_start[bsize] << bsize >> esize);
645 last_high_band = 0; /* avoid warning */
646 for (j = 0; j < n1; j++) {
647 n = s->exponent_high_bands[s->frame_len_bits -
648 s->block_len_bits][j];
649 if (s->high_band_coded[ch][j]) {
652 for (i = 0; i < n; i++) {
653 v = exponents[i << bsize >> esize];
656 exp_power[j] = e2 / n;
658 ff_tlog(s->avctx, "%d: power=%f (%d)\n", j, exp_power[j], n);
660 exponents += n << bsize >> esize;
663 /* main freqs and high freqs */
664 exponents = s->exponents[ch] + (s->coefs_start << bsize >> esize);
665 for (j = -1; j < n1; j++) {
667 n = s->high_band_start[bsize] - s->coefs_start;
669 n = s->exponent_high_bands[s->frame_len_bits -
670 s->block_len_bits][j];
671 if (j >= 0 && s->high_band_coded[ch][j]) {
672 /* use noise with specified power */
673 mult1 = sqrt(exp_power[j] / exp_power[last_high_band]);
674 /* XXX: use a table */
675 mult1 = mult1 * ff_exp10(s->high_band_values[ch][j] * 0.05);
676 mult1 = mult1 / (s->max_exponent[ch] * s->noise_mult);
678 for (i = 0; i < n; i++) {
679 noise = s->noise_table[s->noise_index];
680 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
681 *coefs++ = noise * 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;
710 n = s->block_len - s->coefs_end[bsize];
711 for (i = 0; i < n; i++)
718 for (ch = 0; ch < s->avctx->channels; ch++) {
719 if (s->channel_coded[ch]) {
720 dump_floats(s, "exponents", 3, s->exponents[ch], s->block_len);
721 dump_floats(s, "coefs", 1, s->coefs[ch], s->block_len);
726 if (s->ms_stereo && s->channel_coded[1]) {
727 /* nominal case for ms stereo: we do it before mdct */
728 /* no need to optimize this case because it should almost
730 if (!s->channel_coded[0]) {
731 ff_tlog(s->avctx, "rare ms-stereo case happened\n");
732 memset(s->coefs[0], 0, sizeof(float) * s->block_len);
733 s->channel_coded[0] = 1;
736 s->fdsp->butterflies_float(s->coefs[0], s->coefs[1], s->block_len);
740 mdct = &s->mdct_ctx[bsize];
742 for (ch = 0; ch < s->avctx->channels; ch++) {
745 n4 = s->block_len / 2;
746 if (s->channel_coded[ch])
747 mdct->imdct_calc(mdct, s->output, s->coefs[ch]);
748 else if (!(s->ms_stereo && ch == 1))
749 memset(s->output, 0, sizeof(s->output));
751 /* multiply by the window and add in the frame */
752 index = (s->frame_len / 2) + s->block_pos - n4;
753 wma_window(s, &s->frame_out[ch][index]);
756 /* update block number */
758 s->block_pos += s->block_len;
759 if (s->block_pos >= s->frame_len)
765 /* decode a frame of frame_len samples */
766 static int wma_decode_frame(WMACodecContext *s, float **samples,
772 ff_tlog(s->avctx, "***decode_frame: %d size=%d\n",
773 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,
804 static int wma_decode_superframe(AVCodecContext *avctx, void *data,
805 int *got_frame_ptr, AVPacket *avpkt)
807 AVFrame *frame = data;
808 const uint8_t *buf = avpkt->data;
809 int buf_size = avpkt->size;
810 WMACodecContext *s = avctx->priv_data;
811 int nb_frames, bit_offset, i, pos, len, ret;
816 ff_tlog(avctx, "***decode_superframe:\n");
819 s->last_superframe_len = 0;
822 if (buf_size < avctx->block_align) {
823 av_log(avctx, AV_LOG_ERROR,
824 "Input packet size too small (%d < %d)\n",
825 buf_size, avctx->block_align);
826 return AVERROR_INVALIDDATA;
828 if (avctx->block_align)
829 buf_size = avctx->block_align;
831 init_get_bits(&s->gb, buf, buf_size * 8);
833 if (s->use_bit_reservoir) {
834 /* read super frame header */
835 skip_bits(&s->gb, 4); /* super frame index */
836 nb_frames = get_bits(&s->gb, 4) - (s->last_superframe_len <= 0);
837 if (nb_frames <= 0) {
838 int is_error = nb_frames < 0 || get_bits_left(&s->gb) <= 8;
839 av_log(avctx, is_error ? AV_LOG_ERROR : AV_LOG_WARNING,
840 "nb_frames is %d bits left %d\n",
841 nb_frames, get_bits_left(&s->gb));
843 return AVERROR_INVALIDDATA;
845 if ((s->last_superframe_len + buf_size - 1) >
846 MAX_CODED_SUPERFRAME_SIZE)
849 q = s->last_superframe + s->last_superframe_len;
852 *q++ = get_bits (&s->gb, 8);
855 memset(q, 0, AV_INPUT_BUFFER_PADDING_SIZE);
857 s->last_superframe_len += 8*buf_size - 8;
858 // s->reset_block_lengths = 1; //XXX is this needed ?
865 /* get output buffer */
866 frame->nb_samples = nb_frames * s->frame_len;
867 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
869 samples = (float **) frame->extended_data;
872 if (s->use_bit_reservoir) {
873 bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
874 if (bit_offset > get_bits_left(&s->gb)) {
875 av_log(avctx, AV_LOG_ERROR,
876 "Invalid last frame bit offset %d > buf size %d (%d)\n",
877 bit_offset, get_bits_left(&s->gb), buf_size);
881 if (s->last_superframe_len > 0) {
882 /* add bit_offset bits to last frame */
883 if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) >
884 MAX_CODED_SUPERFRAME_SIZE)
886 q = s->last_superframe + s->last_superframe_len;
889 *q++ = get_bits(&s->gb, 8);
893 *q++ = get_bits(&s->gb, len) << (8 - len);
894 memset(q, 0, AV_INPUT_BUFFER_PADDING_SIZE);
896 /* XXX: bit_offset bits into last frame */
897 init_get_bits(&s->gb, s->last_superframe,
898 s->last_superframe_len * 8 + bit_offset);
899 /* skip unused bits */
900 if (s->last_bitoffset > 0)
901 skip_bits(&s->gb, s->last_bitoffset);
902 /* this frame is stored in the last superframe and in the
904 if (wma_decode_frame(s, samples, samples_offset) < 0)
906 samples_offset += s->frame_len;
910 /* read each frame starting from bit_offset */
911 pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
912 if (pos >= MAX_CODED_SUPERFRAME_SIZE * 8 || pos > buf_size * 8)
913 return AVERROR_INVALIDDATA;
914 init_get_bits(&s->gb, buf + (pos >> 3), (buf_size - (pos >> 3)) * 8);
917 skip_bits(&s->gb, len);
919 s->reset_block_lengths = 1;
920 for (i = 0; i < nb_frames; i++) {
921 if (wma_decode_frame(s, samples, samples_offset) < 0)
923 samples_offset += s->frame_len;
926 /* we copy the end of the frame in the last frame buffer */
927 pos = get_bits_count(&s->gb) +
928 ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7);
929 s->last_bitoffset = pos & 7;
931 len = buf_size - pos;
932 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) {
933 av_log(s->avctx, AV_LOG_ERROR, "len %d invalid\n", len);
936 s->last_superframe_len = len;
937 memcpy(s->last_superframe, buf + pos, len);
939 /* single frame decode */
940 if (wma_decode_frame(s, samples, samples_offset) < 0)
942 samples_offset += s->frame_len;
945 ff_dlog(s->avctx, "%d %d %d %d outbytes:%"PTRDIFF_SPECIFIER" eaten:%d\n",
946 s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len,
947 (int8_t *) samples - (int8_t *) data, avctx->block_align);
954 /* when error, we reset the bit reservoir */
955 s->last_superframe_len = 0;
959 static av_cold void flush(AVCodecContext *avctx)
961 WMACodecContext *s = avctx->priv_data;
964 s->last_superframe_len = 0;
967 #if CONFIG_WMAV1_DECODER
968 AVCodec ff_wmav1_decoder = {
970 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
971 .type = AVMEDIA_TYPE_AUDIO,
972 .id = AV_CODEC_ID_WMAV1,
973 .priv_data_size = sizeof(WMACodecContext),
974 .init = wma_decode_init,
976 .decode = wma_decode_superframe,
978 .capabilities = AV_CODEC_CAP_DR1,
979 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
980 AV_SAMPLE_FMT_NONE },
983 #if CONFIG_WMAV2_DECODER
984 AVCodec ff_wmav2_decoder = {
986 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
987 .type = AVMEDIA_TYPE_AUDIO,
988 .id = AV_CODEC_ID_WMAV2,
989 .priv_data_size = sizeof(WMACodecContext),
990 .init = wma_decode_init,
992 .decode = wma_decode_superframe,
994 .capabilities = AV_CODEC_CAP_DR1,
995 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
996 AV_SAMPLE_FMT_NONE },