2 * WMA compatible decoder
3 * Copyright (c) 2002 The Libav Project
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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"
39 #include "bitstream.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 (ff_wma_init(avctx, flags2) < 0)
99 for (i = 0; i < s->nb_block_sizes; i++)
100 ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 1, 1.0 / 32768.0);
102 if (s->use_noise_coding) {
103 init_vlc(&s->hgain_vlc, HGAINVLCBITS, sizeof(ff_wma_hgain_huffbits),
104 ff_wma_hgain_huffbits, 1, 1,
105 ff_wma_hgain_huffcodes, 2, 2, 0);
109 init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(ff_aac_scalefactor_bits), // FIXME move out of context
110 ff_aac_scalefactor_bits, 1, 1,
111 ff_aac_scalefactor_code, 4, 4, 0);
113 wma_lsp_to_curve_init(s, s->frame_len);
115 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
121 * compute x^-0.25 with an exponent and mantissa table. We use linear
122 * interpolation to reduce the mantissa table size at a small speed
123 * expense (linear interpolation approximately doubles the number of
124 * bits of precision).
126 static inline float pow_m1_4(WMACodecContext *s, float x)
137 m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
138 /* build interpolation scale: 1 <= t < 2. */
139 t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
140 a = s->lsp_pow_m_table1[m];
141 b = s->lsp_pow_m_table2[m];
142 return s->lsp_pow_e_table[e] * (a + b * t.f);
145 static av_cold void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len)
150 wdel = M_PI / frame_len;
151 for (i = 0; i < frame_len; i++)
152 s->lsp_cos_table[i] = 2.0f * cos(wdel * i);
154 /* tables for x^-0.25 computation */
155 for (i = 0; i < 256; i++) {
157 s->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
160 /* NOTE: these two tables are needed to avoid two operations in
163 for (i = (1 << LSP_POW_BITS) - 1; i >= 0; i--) {
164 m = (1 << LSP_POW_BITS) + i;
165 a = (float) m * (0.5 / (1 << LSP_POW_BITS));
167 s->lsp_pow_m_table1[i] = 2 * a - b;
168 s->lsp_pow_m_table2[i] = b - a;
174 * NOTE: We use the same code as Vorbis here
175 * @todo optimize it further with SSE/3Dnow
177 static void wma_lsp_to_curve(WMACodecContext *s, float *out, float *val_max_ptr,
181 float p, q, w, v, val_max;
184 for (i = 0; i < n; i++) {
187 w = s->lsp_cos_table[i];
188 for (j = 1; j < NB_LSP_COEFS; j += 2) {
200 *val_max_ptr = val_max;
204 * decode exponents coded with LSP coefficients (same idea as Vorbis)
206 static void decode_exp_lsp(WMACodecContext *s, int ch)
208 float lsp_coefs[NB_LSP_COEFS];
211 for (i = 0; i < NB_LSP_COEFS; i++) {
212 if (i == 0 || i >= 8)
213 val = bitstream_read(&s->bc, 3);
215 val = bitstream_read(&s->bc, 4);
216 lsp_coefs[i] = ff_wma_lsp_codebook[i][val];
219 wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch],
220 s->block_len, lsp_coefs);
223 /** pow(10, i / 16.0) for i in -60..95 */
224 static const float pow_tab[] = {
225 1.7782794100389e-04, 2.0535250264571e-04,
226 2.3713737056617e-04, 2.7384196342644e-04,
227 3.1622776601684e-04, 3.6517412725484e-04,
228 4.2169650342858e-04, 4.8696752516586e-04,
229 5.6234132519035e-04, 6.4938163157621e-04,
230 7.4989420933246e-04, 8.6596432336006e-04,
231 1.0000000000000e-03, 1.1547819846895e-03,
232 1.3335214321633e-03, 1.5399265260595e-03,
233 1.7782794100389e-03, 2.0535250264571e-03,
234 2.3713737056617e-03, 2.7384196342644e-03,
235 3.1622776601684e-03, 3.6517412725484e-03,
236 4.2169650342858e-03, 4.8696752516586e-03,
237 5.6234132519035e-03, 6.4938163157621e-03,
238 7.4989420933246e-03, 8.6596432336006e-03,
239 1.0000000000000e-02, 1.1547819846895e-02,
240 1.3335214321633e-02, 1.5399265260595e-02,
241 1.7782794100389e-02, 2.0535250264571e-02,
242 2.3713737056617e-02, 2.7384196342644e-02,
243 3.1622776601684e-02, 3.6517412725484e-02,
244 4.2169650342858e-02, 4.8696752516586e-02,
245 5.6234132519035e-02, 6.4938163157621e-02,
246 7.4989420933246e-02, 8.6596432336007e-02,
247 1.0000000000000e-01, 1.1547819846895e-01,
248 1.3335214321633e-01, 1.5399265260595e-01,
249 1.7782794100389e-01, 2.0535250264571e-01,
250 2.3713737056617e-01, 2.7384196342644e-01,
251 3.1622776601684e-01, 3.6517412725484e-01,
252 4.2169650342858e-01, 4.8696752516586e-01,
253 5.6234132519035e-01, 6.4938163157621e-01,
254 7.4989420933246e-01, 8.6596432336007e-01,
255 1.0000000000000e+00, 1.1547819846895e+00,
256 1.3335214321633e+00, 1.5399265260595e+00,
257 1.7782794100389e+00, 2.0535250264571e+00,
258 2.3713737056617e+00, 2.7384196342644e+00,
259 3.1622776601684e+00, 3.6517412725484e+00,
260 4.2169650342858e+00, 4.8696752516586e+00,
261 5.6234132519035e+00, 6.4938163157621e+00,
262 7.4989420933246e+00, 8.6596432336007e+00,
263 1.0000000000000e+01, 1.1547819846895e+01,
264 1.3335214321633e+01, 1.5399265260595e+01,
265 1.7782794100389e+01, 2.0535250264571e+01,
266 2.3713737056617e+01, 2.7384196342644e+01,
267 3.1622776601684e+01, 3.6517412725484e+01,
268 4.2169650342858e+01, 4.8696752516586e+01,
269 5.6234132519035e+01, 6.4938163157621e+01,
270 7.4989420933246e+01, 8.6596432336007e+01,
271 1.0000000000000e+02, 1.1547819846895e+02,
272 1.3335214321633e+02, 1.5399265260595e+02,
273 1.7782794100389e+02, 2.0535250264571e+02,
274 2.3713737056617e+02, 2.7384196342644e+02,
275 3.1622776601684e+02, 3.6517412725484e+02,
276 4.2169650342858e+02, 4.8696752516586e+02,
277 5.6234132519035e+02, 6.4938163157621e+02,
278 7.4989420933246e+02, 8.6596432336007e+02,
279 1.0000000000000e+03, 1.1547819846895e+03,
280 1.3335214321633e+03, 1.5399265260595e+03,
281 1.7782794100389e+03, 2.0535250264571e+03,
282 2.3713737056617e+03, 2.7384196342644e+03,
283 3.1622776601684e+03, 3.6517412725484e+03,
284 4.2169650342858e+03, 4.8696752516586e+03,
285 5.6234132519035e+03, 6.4938163157621e+03,
286 7.4989420933246e+03, 8.6596432336007e+03,
287 1.0000000000000e+04, 1.1547819846895e+04,
288 1.3335214321633e+04, 1.5399265260595e+04,
289 1.7782794100389e+04, 2.0535250264571e+04,
290 2.3713737056617e+04, 2.7384196342644e+04,
291 3.1622776601684e+04, 3.6517412725484e+04,
292 4.2169650342858e+04, 4.8696752516586e+04,
293 5.6234132519035e+04, 6.4938163157621e+04,
294 7.4989420933246e+04, 8.6596432336007e+04,
295 1.0000000000000e+05, 1.1547819846895e+05,
296 1.3335214321633e+05, 1.5399265260595e+05,
297 1.7782794100389e+05, 2.0535250264571e+05,
298 2.3713737056617e+05, 2.7384196342644e+05,
299 3.1622776601684e+05, 3.6517412725484e+05,
300 4.2169650342858e+05, 4.8696752516586e+05,
301 5.6234132519035e+05, 6.4938163157621e+05,
302 7.4989420933246e+05, 8.6596432336007e+05,
306 * decode exponents coded with VLC codes
308 static int decode_exp_vlc(WMACodecContext *s, int ch)
310 int last_exp, n, code;
313 uint32_t *q, *q_end, iv;
314 const float *ptab = pow_tab + 60;
315 const uint32_t *iptab = (const uint32_t *) ptab;
317 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
318 q = (uint32_t *) s->exponents[ch];
319 q_end = q + s->block_len;
321 if (s->version == 1) {
322 last_exp = bitstream_read(&s->bc, 5) + 10;
324 iv = iptab[last_exp];
332 } while ((n -= 4) > 0);
337 code = bitstream_read_vlc(&s->bc, s->exp_vlc.table, EXPVLCBITS, EXPMAX);
339 av_log(s->avctx, AV_LOG_ERROR, "Exponent vlc invalid\n");
342 /* NOTE: this offset is the same as MPEG-4 AAC! */
343 last_exp += code - 60;
344 if ((unsigned) last_exp + 60 >= FF_ARRAY_ELEMS(pow_tab)) {
345 av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n",
350 iv = iptab[last_exp];
359 } while ((n -= 4) > 0);
361 s->max_exponent[ch] = max_scale;
366 * Apply MDCT window and add into output.
368 * We ensure that when the windows overlap their squared sum
369 * is always 1 (MDCT reconstruction rule).
371 static void wma_window(WMACodecContext *s, float *out)
373 float *in = s->output;
374 int block_len, bsize, n;
377 if (s->block_len_bits <= s->prev_block_len_bits) {
378 block_len = s->block_len;
379 bsize = s->frame_len_bits - s->block_len_bits;
381 s->fdsp.vector_fmul_add(out, in, s->windows[bsize],
384 block_len = 1 << s->prev_block_len_bits;
385 n = (s->block_len - block_len) / 2;
386 bsize = s->frame_len_bits - s->prev_block_len_bits;
388 s->fdsp.vector_fmul_add(out + n, in + n, s->windows[bsize],
391 memcpy(out + n + block_len, in + n + block_len, n * sizeof(float));
398 if (s->block_len_bits <= s->next_block_len_bits) {
399 block_len = s->block_len;
400 bsize = s->frame_len_bits - s->block_len_bits;
402 s->fdsp.vector_fmul_reverse(out, in, s->windows[bsize], block_len);
404 block_len = 1 << s->next_block_len_bits;
405 n = (s->block_len - block_len) / 2;
406 bsize = s->frame_len_bits - s->next_block_len_bits;
408 memcpy(out, in, n * sizeof(float));
410 s->fdsp.vector_fmul_reverse(out + n, in + n, s->windows[bsize],
413 memset(out + n + block_len, 0, n * sizeof(float));
418 * @return 0 if OK. 1 if last block of frame. return -1 if
419 * unrecoverable error.
421 static int wma_decode_block(WMACodecContext *s)
423 int n, v, a, ch, bsize;
424 int coef_nb_bits, total_gain;
425 int nb_coefs[MAX_CHANNELS];
430 ff_tlog(s->avctx, "***decode_block: %d:%d\n",
431 s->frame_count - 1, s->block_num);
434 /* compute current block length */
435 if (s->use_variable_block_len) {
436 n = av_log2(s->nb_block_sizes - 1) + 1;
438 if (s->reset_block_lengths) {
439 s->reset_block_lengths = 0;
440 v = bitstream_read(&s->bc, n);
441 if (v >= s->nb_block_sizes) {
442 av_log(s->avctx, AV_LOG_ERROR,
443 "prev_block_len_bits %d out of range\n",
444 s->frame_len_bits - v);
447 s->prev_block_len_bits = s->frame_len_bits - v;
448 v = bitstream_read(&s->bc, n);
449 if (v >= s->nb_block_sizes) {
450 av_log(s->avctx, AV_LOG_ERROR,
451 "block_len_bits %d out of range\n",
452 s->frame_len_bits - v);
455 s->block_len_bits = s->frame_len_bits - v;
457 /* update block lengths */
458 s->prev_block_len_bits = s->block_len_bits;
459 s->block_len_bits = s->next_block_len_bits;
461 v = bitstream_read(&s->bc, n);
462 if (v >= s->nb_block_sizes) {
463 av_log(s->avctx, AV_LOG_ERROR,
464 "next_block_len_bits %d out of range\n",
465 s->frame_len_bits - v);
468 s->next_block_len_bits = s->frame_len_bits - v;
470 /* fixed block len */
471 s->next_block_len_bits = s->frame_len_bits;
472 s->prev_block_len_bits = s->frame_len_bits;
473 s->block_len_bits = s->frame_len_bits;
476 /* now check if the block length is coherent with the frame length */
477 s->block_len = 1 << s->block_len_bits;
478 if ((s->block_pos + s->block_len) > s->frame_len) {
479 av_log(s->avctx, AV_LOG_ERROR, "frame_len overflow\n");
483 if (s->avctx->channels == 2)
484 s->ms_stereo = bitstream_read_bit(&s->bc);
486 for (ch = 0; ch < s->avctx->channels; ch++) {
487 a = bitstream_read_bit(&s->bc);
488 s->channel_coded[ch] = a;
492 bsize = s->frame_len_bits - s->block_len_bits;
494 /* if no channel coded, no need to go further */
495 /* XXX: fix potential framing problems */
499 /* read total gain and extract corresponding number of bits for
500 * coef escape coding */
503 a = bitstream_read(&s->bc, 7);
509 coef_nb_bits = ff_wma_total_gain_to_bits(total_gain);
511 /* compute number of coefficients */
512 n = s->coefs_end[bsize] - s->coefs_start;
513 for (ch = 0; ch < s->avctx->channels; ch++)
517 if (s->use_noise_coding) {
518 for (ch = 0; ch < s->avctx->channels; ch++) {
519 if (s->channel_coded[ch]) {
521 n = s->exponent_high_sizes[bsize];
522 for (i = 0; i < n; i++) {
523 a = bitstream_read_bit(&s->bc);
524 s->high_band_coded[ch][i] = a;
525 /* if noise coding, the coefficients are not transmitted */
527 nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
531 for (ch = 0; ch < s->avctx->channels; ch++) {
532 if (s->channel_coded[ch]) {
535 n = s->exponent_high_sizes[bsize];
536 val = (int) 0x80000000;
537 for (i = 0; i < n; i++) {
538 if (s->high_band_coded[ch][i]) {
539 if (val == (int) 0x80000000) {
540 val = bitstream_read(&s->bc, 7) - 19;
542 code = bitstream_read_vlc(&s->bc,
544 HGAINVLCBITS, HGAINMAX);
546 av_log(s->avctx, AV_LOG_ERROR,
547 "hgain vlc invalid\n");
552 s->high_band_values[ch][i] = val;
559 /* exponents can be reused in short blocks. */
560 if ((s->block_len_bits == s->frame_len_bits) || bitstream_read_bit(&s->bc)) {
561 for (ch = 0; ch < s->avctx->channels; ch++) {
562 if (s->channel_coded[ch]) {
563 if (s->use_exp_vlc) {
564 if (decode_exp_vlc(s, ch) < 0)
567 decode_exp_lsp(s, ch);
569 s->exponents_bsize[ch] = bsize;
574 /* parse spectral coefficients : just RLE encoding */
575 for (ch = 0; ch < s->avctx->channels; ch++) {
576 if (s->channel_coded[ch]) {
578 WMACoef *ptr = &s->coefs1[ch][0];
580 /* special VLC tables are used for ms stereo because
581 * there is potentially less energy there */
582 tindex = (ch == 1 && s->ms_stereo);
583 memset(ptr, 0, s->block_len * sizeof(WMACoef));
584 ff_wma_run_level_decode(s->avctx, &s->bc, &s->coef_vlc[tindex],
585 s->level_table[tindex], s->run_table[tindex],
586 0, ptr, 0, nb_coefs[ch],
587 s->block_len, s->frame_len_bits, coef_nb_bits);
589 if (s->version == 1 && s->avctx->channels >= 2)
590 bitstream_align(&s->bc);
595 int n4 = s->block_len / 2;
596 mdct_norm = 1.0 / (float) n4;
598 mdct_norm *= sqrt(n4);
601 /* finally compute the MDCT coefficients */
602 for (ch = 0; ch < s->avctx->channels; ch++) {
603 if (s->channel_coded[ch]) {
605 float *coefs, *exponents, mult, mult1, noise;
606 int i, j, n, n1, last_high_band, esize;
607 float exp_power[HIGH_BAND_MAX_SIZE];
609 coefs1 = s->coefs1[ch];
610 exponents = s->exponents[ch];
611 esize = s->exponents_bsize[ch];
612 mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
614 coefs = s->coefs[ch];
615 if (s->use_noise_coding) {
617 /* very low freqs : noise */
618 for (i = 0; i < s->coefs_start; i++) {
619 *coefs++ = s->noise_table[s->noise_index] *
620 exponents[i << bsize >> esize] * mult1;
621 s->noise_index = (s->noise_index + 1) &
622 (NOISE_TAB_SIZE - 1);
625 n1 = s->exponent_high_sizes[bsize];
627 /* compute power of high bands */
628 exponents = s->exponents[ch] +
629 (s->high_band_start[bsize] << bsize >> esize);
630 last_high_band = 0; /* avoid warning */
631 for (j = 0; j < n1; j++) {
632 n = s->exponent_high_bands[s->frame_len_bits -
633 s->block_len_bits][j];
634 if (s->high_band_coded[ch][j]) {
637 for (i = 0; i < n; i++) {
638 v = exponents[i << bsize >> esize];
641 exp_power[j] = e2 / n;
643 ff_tlog(s->avctx, "%d: power=%f (%d)\n", j, exp_power[j], n);
645 exponents += n << bsize >> esize;
648 /* main freqs and high freqs */
649 exponents = s->exponents[ch] + (s->coefs_start << bsize >> esize);
650 for (j = -1; j < n1; j++) {
652 n = s->high_band_start[bsize] - s->coefs_start;
654 n = s->exponent_high_bands[s->frame_len_bits -
655 s->block_len_bits][j];
656 if (j >= 0 && s->high_band_coded[ch][j]) {
657 /* use noise with specified power */
658 mult1 = sqrt(exp_power[j] / exp_power[last_high_band]);
659 /* XXX: use a table */
660 mult1 = mult1 * pow(10, s->high_band_values[ch][j] * 0.05);
661 mult1 = mult1 / (s->max_exponent[ch] * s->noise_mult);
663 for (i = 0; i < n; i++) {
664 noise = s->noise_table[s->noise_index];
665 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
666 *coefs++ = noise * exponents[i << bsize >> esize] * mult1;
668 exponents += n << bsize >> esize;
670 /* coded values + small noise */
671 for (i = 0; i < n; i++) {
672 noise = s->noise_table[s->noise_index];
673 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
674 *coefs++ = ((*coefs1++) + noise) *
675 exponents[i << bsize >> esize] * mult;
677 exponents += n << bsize >> esize;
681 /* very high freqs : noise */
682 n = s->block_len - s->coefs_end[bsize];
683 mult1 = mult * exponents[((-1 << bsize)) >> esize];
684 for (i = 0; i < n; i++) {
685 *coefs++ = s->noise_table[s->noise_index] * mult1;
686 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
689 /* XXX: optimize more */
690 for (i = 0; i < s->coefs_start; i++)
693 for (i = 0; i < n; i++)
694 *coefs++ = coefs1[i] * exponents[i << bsize >> esize] * mult;
695 n = s->block_len - s->coefs_end[bsize];
696 for (i = 0; i < n; i++)
703 for (ch = 0; ch < s->avctx->channels; ch++) {
704 if (s->channel_coded[ch]) {
705 dump_floats(s, "exponents", 3, s->exponents[ch], s->block_len);
706 dump_floats(s, "coefs", 1, s->coefs[ch], s->block_len);
711 if (s->ms_stereo && s->channel_coded[1]) {
712 /* nominal case for ms stereo: we do it before mdct */
713 /* no need to optimize this case because it should almost
715 if (!s->channel_coded[0]) {
716 ff_tlog(s->avctx, "rare ms-stereo case happened\n");
717 memset(s->coefs[0], 0, sizeof(float) * s->block_len);
718 s->channel_coded[0] = 1;
721 s->fdsp.butterflies_float(s->coefs[0], s->coefs[1], s->block_len);
725 mdct = &s->mdct_ctx[bsize];
727 for (ch = 0; ch < s->avctx->channels; ch++) {
730 n4 = s->block_len / 2;
731 if (s->channel_coded[ch])
732 mdct->imdct_calc(mdct, s->output, s->coefs[ch]);
733 else if (!(s->ms_stereo && ch == 1))
734 memset(s->output, 0, sizeof(s->output));
736 /* multiply by the window and add in the frame */
737 index = (s->frame_len / 2) + s->block_pos - n4;
738 wma_window(s, &s->frame_out[ch][index]);
741 /* update block number */
743 s->block_pos += s->block_len;
744 if (s->block_pos >= s->frame_len)
750 /* decode a frame of frame_len samples */
751 static int wma_decode_frame(WMACodecContext *s, float **samples,
757 ff_tlog(s->avctx, "***decode_frame: %d size=%d\n",
758 s->frame_count++, s->frame_len);
761 /* read each block */
765 ret = wma_decode_block(s);
772 for (ch = 0; ch < s->avctx->channels; ch++) {
773 /* copy current block to output */
774 memcpy(samples[ch] + samples_offset, s->frame_out[ch],
775 s->frame_len * sizeof(*s->frame_out[ch]));
776 /* prepare for next block */
777 memmove(&s->frame_out[ch][0], &s->frame_out[ch][s->frame_len],
778 s->frame_len * sizeof(*s->frame_out[ch]));
781 dump_floats(s, "samples", 6, samples[ch] + samples_offset,
789 static int wma_decode_superframe(AVCodecContext *avctx, void *data,
790 int *got_frame_ptr, AVPacket *avpkt)
792 AVFrame *frame = data;
793 const uint8_t *buf = avpkt->data;
794 int buf_size = avpkt->size;
795 WMACodecContext *s = avctx->priv_data;
796 int nb_frames, bit_offset, i, pos, len, ret;
801 ff_tlog(avctx, "***decode_superframe:\n");
804 s->last_superframe_len = 0;
807 if (buf_size < avctx->block_align) {
808 av_log(avctx, AV_LOG_ERROR,
809 "Input packet size too small (%d < %d)\n",
810 buf_size, avctx->block_align);
811 return AVERROR_INVALIDDATA;
813 buf_size = avctx->block_align;
815 bitstream_init8(&s->bc, buf, buf_size);
817 if (s->use_bit_reservoir) {
818 /* read super frame header */
819 bitstream_skip(&s->bc, 4); /* super frame index */
820 nb_frames = bitstream_read(&s->bc, 4) - (s->last_superframe_len <= 0);
824 /* get output buffer */
825 frame->nb_samples = nb_frames * s->frame_len;
826 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
827 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
830 samples = (float **) frame->extended_data;
833 if (s->use_bit_reservoir) {
834 bit_offset = bitstream_read(&s->bc, s->byte_offset_bits + 3);
835 if (bit_offset > bitstream_bits_left(&s->bc)) {
836 av_log(avctx, AV_LOG_ERROR,
837 "Invalid last frame bit offset %d > buf size %d (%d)\n",
838 bit_offset, bitstream_bits_left(&s->bc), buf_size);
842 if (s->last_superframe_len > 0) {
843 /* add bit_offset bits to last frame */
844 if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) >
845 MAX_CODED_SUPERFRAME_SIZE)
847 q = s->last_superframe + s->last_superframe_len;
850 *q++ = bitstream_read(&s->bc, 8);
854 *q++ = bitstream_read(&s->bc, len) << (8 - len);
855 memset(q, 0, AV_INPUT_BUFFER_PADDING_SIZE);
857 /* XXX: bit_offset bits into last frame */
858 bitstream_init(&s->bc, s->last_superframe,
859 s->last_superframe_len * 8 + bit_offset);
860 /* skip unused bits */
861 if (s->last_bitoffset > 0)
862 bitstream_skip(&s->bc, s->last_bitoffset);
863 /* this frame is stored in the last superframe and in the
865 if (wma_decode_frame(s, samples, samples_offset) < 0)
867 samples_offset += s->frame_len;
871 /* read each frame starting from bit_offset */
872 pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
873 if (pos >= MAX_CODED_SUPERFRAME_SIZE * 8 || pos > buf_size * 8)
874 return AVERROR_INVALIDDATA;
875 bitstream_init8(&s->bc, buf + (pos >> 3), buf_size - (pos >> 3));
878 bitstream_skip(&s->bc, len);
880 s->reset_block_lengths = 1;
881 for (i = 0; i < nb_frames; i++) {
882 if (wma_decode_frame(s, samples, samples_offset) < 0)
884 samples_offset += s->frame_len;
887 /* we copy the end of the frame in the last frame buffer */
888 pos = bitstream_tell(&s->bc) +
889 ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7);
890 s->last_bitoffset = pos & 7;
892 len = buf_size - pos;
893 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) {
894 av_log(s->avctx, AV_LOG_ERROR, "len %d invalid\n", len);
897 s->last_superframe_len = len;
898 memcpy(s->last_superframe, buf + pos, len);
900 /* single frame decode */
901 if (wma_decode_frame(s, samples, samples_offset) < 0)
903 samples_offset += s->frame_len;
906 ff_dlog(s->avctx, "%d %d %d %d outbytes:%td eaten:%d\n",
907 s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len,
908 (int8_t *) samples - (int8_t *) data, avctx->block_align);
912 return avctx->block_align;
915 /* when error, we reset the bit reservoir */
916 s->last_superframe_len = 0;
920 static av_cold void flush(AVCodecContext *avctx)
922 WMACodecContext *s = avctx->priv_data;
925 s->last_superframe_len = 0;
928 AVCodec ff_wmav1_decoder = {
930 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
931 .type = AVMEDIA_TYPE_AUDIO,
932 .id = AV_CODEC_ID_WMAV1,
933 .priv_data_size = sizeof(WMACodecContext),
934 .init = wma_decode_init,
936 .decode = wma_decode_superframe,
938 .capabilities = AV_CODEC_CAP_DR1,
939 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
940 AV_SAMPLE_FMT_NONE },
943 AVCodec ff_wmav2_decoder = {
945 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
946 .type = AVMEDIA_TYPE_AUDIO,
947 .id = AV_CODEC_ID_WMAV2,
948 .priv_data_size = sizeof(WMACodecContext),
949 .init = wma_decode_init,
951 .decode = wma_decode_superframe,
953 .capabilities = AV_CODEC_CAP_DR1,
954 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
955 AV_SAMPLE_FMT_NONE },