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.
43 #define EXPMAX ((19+EXPVLCBITS-1)/EXPVLCBITS)
45 #define HGAINVLCBITS 9
46 #define HGAINMAX ((13+HGAINVLCBITS-1)/HGAINVLCBITS)
48 static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len);
51 static void dump_shorts(WMACodecContext *s, const char *name, const short *tab, int n)
55 tprintf(s->avctx, "%s[%d]:\n", name, n);
58 tprintf(s->avctx, "%4d: ", i);
59 tprintf(s->avctx, " %5d.0", tab[i]);
61 tprintf(s->avctx, "\n");
65 static void dump_floats(WMACodecContext *s, const char *name, int prec, const float *tab, int n)
69 tprintf(s->avctx, "%s[%d]:\n", name, n);
72 tprintf(s->avctx, "%4d: ", i);
73 tprintf(s->avctx, " %8.*f", prec, tab[i]);
75 tprintf(s->avctx, "\n");
78 tprintf(s->avctx, "\n");
82 static int wma_decode_init(AVCodecContext * avctx)
84 WMACodecContext *s = avctx->priv_data;
90 /* extract flag infos */
92 extradata = avctx->extradata;
93 if (avctx->codec->id == CODEC_ID_WMAV1 && avctx->extradata_size >= 4) {
94 flags2 = AV_RL16(extradata+2);
95 } else if (avctx->codec->id == CODEC_ID_WMAV2 && avctx->extradata_size >= 6) {
96 flags2 = AV_RL16(extradata+4);
98 // for(i=0; i<avctx->extradata_size; i++)
99 // av_log(NULL, AV_LOG_ERROR, "%02X ", extradata[i]);
101 s->use_exp_vlc = flags2 & 0x0001;
102 s->use_bit_reservoir = flags2 & 0x0002;
103 s->use_variable_block_len = flags2 & 0x0004;
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);
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);
118 if (s->use_exp_vlc) {
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);
126 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
128 avcodec_get_frame_defaults(&s->frame);
129 avctx->coded_frame = &s->frame;
135 * compute x^-0.25 with an exponent and mantissa table. We use linear
136 * interpolation to reduce the mantissa table size at a small speed
137 * expense (linear interpolation approximately doubles the number of
138 * bits of precision).
140 static inline float pow_m1_4(WMACodecContext *s, float x)
151 m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
152 /* build interpolation scale: 1 <= t < 2. */
153 t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
154 a = s->lsp_pow_m_table1[m];
155 b = s->lsp_pow_m_table2[m];
156 return s->lsp_pow_e_table[e] * (a + b * t.f);
159 static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len)
164 wdel = M_PI / frame_len;
165 for(i=0;i<frame_len;i++)
166 s->lsp_cos_table[i] = 2.0f * cos(wdel * i);
168 /* tables for x^-0.25 computation */
171 s->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
174 /* NOTE: these two tables are needed to avoid two operations in
177 for(i=(1 << LSP_POW_BITS) - 1;i>=0;i--) {
178 m = (1 << LSP_POW_BITS) + i;
179 a = (float)m * (0.5 / (1 << LSP_POW_BITS));
181 s->lsp_pow_m_table1[i] = 2 * a - b;
182 s->lsp_pow_m_table2[i] = b - a;
188 * NOTE: We use the same code as Vorbis here
189 * @todo optimize it further with SSE/3Dnow
191 static void wma_lsp_to_curve(WMACodecContext *s,
192 float *out, float *val_max_ptr,
196 float p, q, w, v, val_max;
202 w = s->lsp_cos_table[i];
203 for(j=1;j<NB_LSP_COEFS;j+=2){
215 *val_max_ptr = val_max;
219 * decode exponents coded with LSP coefficients (same idea as Vorbis)
221 static void decode_exp_lsp(WMACodecContext *s, int ch)
223 float lsp_coefs[NB_LSP_COEFS];
226 for(i = 0; i < NB_LSP_COEFS; i++) {
227 if (i == 0 || i >= 8)
228 val = get_bits(&s->gb, 3);
230 val = get_bits(&s->gb, 4);
231 lsp_coefs[i] = ff_wma_lsp_codebook[i][val];
234 wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch],
235 s->block_len, lsp_coefs);
238 /** pow(10, i / 16.0) for i in -60..95 */
239 static const float pow_tab[] = {
240 1.7782794100389e-04, 2.0535250264571e-04,
241 2.3713737056617e-04, 2.7384196342644e-04,
242 3.1622776601684e-04, 3.6517412725484e-04,
243 4.2169650342858e-04, 4.8696752516586e-04,
244 5.6234132519035e-04, 6.4938163157621e-04,
245 7.4989420933246e-04, 8.6596432336006e-04,
246 1.0000000000000e-03, 1.1547819846895e-03,
247 1.3335214321633e-03, 1.5399265260595e-03,
248 1.7782794100389e-03, 2.0535250264571e-03,
249 2.3713737056617e-03, 2.7384196342644e-03,
250 3.1622776601684e-03, 3.6517412725484e-03,
251 4.2169650342858e-03, 4.8696752516586e-03,
252 5.6234132519035e-03, 6.4938163157621e-03,
253 7.4989420933246e-03, 8.6596432336006e-03,
254 1.0000000000000e-02, 1.1547819846895e-02,
255 1.3335214321633e-02, 1.5399265260595e-02,
256 1.7782794100389e-02, 2.0535250264571e-02,
257 2.3713737056617e-02, 2.7384196342644e-02,
258 3.1622776601684e-02, 3.6517412725484e-02,
259 4.2169650342858e-02, 4.8696752516586e-02,
260 5.6234132519035e-02, 6.4938163157621e-02,
261 7.4989420933246e-02, 8.6596432336007e-02,
262 1.0000000000000e-01, 1.1547819846895e-01,
263 1.3335214321633e-01, 1.5399265260595e-01,
264 1.7782794100389e-01, 2.0535250264571e-01,
265 2.3713737056617e-01, 2.7384196342644e-01,
266 3.1622776601684e-01, 3.6517412725484e-01,
267 4.2169650342858e-01, 4.8696752516586e-01,
268 5.6234132519035e-01, 6.4938163157621e-01,
269 7.4989420933246e-01, 8.6596432336007e-01,
270 1.0000000000000e+00, 1.1547819846895e+00,
271 1.3335214321633e+00, 1.5399265260595e+00,
272 1.7782794100389e+00, 2.0535250264571e+00,
273 2.3713737056617e+00, 2.7384196342644e+00,
274 3.1622776601684e+00, 3.6517412725484e+00,
275 4.2169650342858e+00, 4.8696752516586e+00,
276 5.6234132519035e+00, 6.4938163157621e+00,
277 7.4989420933246e+00, 8.6596432336007e+00,
278 1.0000000000000e+01, 1.1547819846895e+01,
279 1.3335214321633e+01, 1.5399265260595e+01,
280 1.7782794100389e+01, 2.0535250264571e+01,
281 2.3713737056617e+01, 2.7384196342644e+01,
282 3.1622776601684e+01, 3.6517412725484e+01,
283 4.2169650342858e+01, 4.8696752516586e+01,
284 5.6234132519035e+01, 6.4938163157621e+01,
285 7.4989420933246e+01, 8.6596432336007e+01,
286 1.0000000000000e+02, 1.1547819846895e+02,
287 1.3335214321633e+02, 1.5399265260595e+02,
288 1.7782794100389e+02, 2.0535250264571e+02,
289 2.3713737056617e+02, 2.7384196342644e+02,
290 3.1622776601684e+02, 3.6517412725484e+02,
291 4.2169650342858e+02, 4.8696752516586e+02,
292 5.6234132519035e+02, 6.4938163157621e+02,
293 7.4989420933246e+02, 8.6596432336007e+02,
294 1.0000000000000e+03, 1.1547819846895e+03,
295 1.3335214321633e+03, 1.5399265260595e+03,
296 1.7782794100389e+03, 2.0535250264571e+03,
297 2.3713737056617e+03, 2.7384196342644e+03,
298 3.1622776601684e+03, 3.6517412725484e+03,
299 4.2169650342858e+03, 4.8696752516586e+03,
300 5.6234132519035e+03, 6.4938163157621e+03,
301 7.4989420933246e+03, 8.6596432336007e+03,
302 1.0000000000000e+04, 1.1547819846895e+04,
303 1.3335214321633e+04, 1.5399265260595e+04,
304 1.7782794100389e+04, 2.0535250264571e+04,
305 2.3713737056617e+04, 2.7384196342644e+04,
306 3.1622776601684e+04, 3.6517412725484e+04,
307 4.2169650342858e+04, 4.8696752516586e+04,
308 5.6234132519035e+04, 6.4938163157621e+04,
309 7.4989420933246e+04, 8.6596432336007e+04,
310 1.0000000000000e+05, 1.1547819846895e+05,
311 1.3335214321633e+05, 1.5399265260595e+05,
312 1.7782794100389e+05, 2.0535250264571e+05,
313 2.3713737056617e+05, 2.7384196342644e+05,
314 3.1622776601684e+05, 3.6517412725484e+05,
315 4.2169650342858e+05, 4.8696752516586e+05,
316 5.6234132519035e+05, 6.4938163157621e+05,
317 7.4989420933246e+05, 8.6596432336007e+05,
321 * decode exponents coded with VLC codes
323 static int decode_exp_vlc(WMACodecContext *s, int ch)
325 int last_exp, n, code;
328 uint32_t *q, *q_end, iv;
329 const float *ptab = pow_tab + 60;
330 const uint32_t *iptab = (const uint32_t*)ptab;
332 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
333 q = (uint32_t *)s->exponents[ch];
334 q_end = q + s->block_len;
336 if (s->version == 1) {
337 last_exp = get_bits(&s->gb, 5) + 10;
339 iv = iptab[last_exp];
347 } while ((n -= 4) > 0);
352 code = get_vlc2(&s->gb, s->exp_vlc.table, EXPVLCBITS, EXPMAX);
354 av_log(s->avctx, AV_LOG_ERROR, "Exponent vlc invalid\n");
357 /* NOTE: this offset is the same as MPEG4 AAC ! */
358 last_exp += code - 60;
359 if ((unsigned)last_exp + 60 > FF_ARRAY_ELEMS(pow_tab)) {
360 av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n",
365 iv = iptab[last_exp];
374 } while ((n -= 4) > 0);
376 s->max_exponent[ch] = max_scale;
382 * Apply MDCT window and add into output.
384 * We ensure that when the windows overlap their squared sum
385 * is always 1 (MDCT reconstruction rule).
387 static void wma_window(WMACodecContext *s, float *out)
389 float *in = s->output;
390 int block_len, bsize, n;
393 if (s->block_len_bits <= s->prev_block_len_bits) {
394 block_len = s->block_len;
395 bsize = s->frame_len_bits - s->block_len_bits;
397 s->dsp.vector_fmul_add(out, in, s->windows[bsize],
401 block_len = 1 << s->prev_block_len_bits;
402 n = (s->block_len - block_len) / 2;
403 bsize = s->frame_len_bits - s->prev_block_len_bits;
405 s->dsp.vector_fmul_add(out+n, in+n, s->windows[bsize],
408 memcpy(out+n+block_len, in+n+block_len, n*sizeof(float));
415 if (s->block_len_bits <= s->next_block_len_bits) {
416 block_len = s->block_len;
417 bsize = s->frame_len_bits - s->block_len_bits;
419 s->dsp.vector_fmul_reverse(out, in, s->windows[bsize], block_len);
422 block_len = 1 << s->next_block_len_bits;
423 n = (s->block_len - block_len) / 2;
424 bsize = s->frame_len_bits - s->next_block_len_bits;
426 memcpy(out, in, n*sizeof(float));
428 s->dsp.vector_fmul_reverse(out+n, in+n, s->windows[bsize], block_len);
430 memset(out+n+block_len, 0, n*sizeof(float));
436 * @return 0 if OK. 1 if last block of frame. return -1 if
437 * unrecorrable error.
439 static int wma_decode_block(WMACodecContext *s)
441 int n, v, a, ch, bsize;
442 int coef_nb_bits, total_gain;
443 int nb_coefs[MAX_CHANNELS];
448 tprintf(s->avctx, "***decode_block: %d:%d\n", s->frame_count - 1, s->block_num);
451 /* compute current block length */
452 if (s->use_variable_block_len) {
453 n = av_log2(s->nb_block_sizes - 1) + 1;
455 if (s->reset_block_lengths) {
456 s->reset_block_lengths = 0;
457 v = get_bits(&s->gb, n);
458 if (v >= s->nb_block_sizes){
459 av_log(s->avctx, AV_LOG_ERROR, "prev_block_len_bits %d out of range\n", s->frame_len_bits - v);
462 s->prev_block_len_bits = s->frame_len_bits - v;
463 v = get_bits(&s->gb, n);
464 if (v >= s->nb_block_sizes){
465 av_log(s->avctx, AV_LOG_ERROR, "block_len_bits %d out of range\n", s->frame_len_bits - v);
468 s->block_len_bits = s->frame_len_bits - v;
470 /* update block lengths */
471 s->prev_block_len_bits = s->block_len_bits;
472 s->block_len_bits = s->next_block_len_bits;
474 v = get_bits(&s->gb, n);
475 if (v >= s->nb_block_sizes){
476 av_log(s->avctx, AV_LOG_ERROR, "next_block_len_bits %d out of range\n", 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 /* 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->nb_channels == 2) {
495 s->ms_stereo = get_bits1(&s->gb);
498 for(ch = 0; ch < s->nb_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->nb_channels; ch++)
529 if (s->use_noise_coding) {
531 for(ch = 0; ch < s->nb_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->nb_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->nb_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->nb_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->nb_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->nb_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->nb_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->dsp.butterflies_float(s->coefs[0], s->coefs[1], s->block_len);
741 mdct = &s->mdct_ctx[bsize];
743 for(ch = 0; ch < s->nb_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, int16_t *samples)
769 int ret, n, ch, incr;
770 const float *output[MAX_CHANNELS];
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 /* convert frame to integer */
789 incr = s->nb_channels;
790 for (ch = 0; ch < MAX_CHANNELS; ch++)
791 output[ch] = s->frame_out[ch];
792 s->fmt_conv.float_to_int16_interleave(samples, output, n, incr);
793 for (ch = 0; ch < incr; ch++) {
794 /* prepare for next block */
795 memmove(&s->frame_out[ch][0], &s->frame_out[ch][n], n * sizeof(float));
799 dump_shorts(s, "samples", samples, n * s->nb_channels);
804 static int wma_decode_superframe(AVCodecContext *avctx, void *data,
805 int *got_frame_ptr, AVPacket *avpkt)
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;
814 tprintf(avctx, "***decode_superframe:\n");
817 s->last_superframe_len = 0;
820 if (buf_size < s->block_align)
822 buf_size = s->block_align;
824 init_get_bits(&s->gb, buf, buf_size*8);
826 if (s->use_bit_reservoir) {
827 /* read super frame header */
828 skip_bits(&s->gb, 4); /* super frame index */
829 nb_frames = get_bits(&s->gb, 4) - (s->last_superframe_len <= 0);
834 /* get output buffer */
835 s->frame.nb_samples = nb_frames * s->frame_len;
836 if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
837 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
840 samples = (int16_t *)s->frame.data[0];
842 if (s->use_bit_reservoir) {
843 bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
845 if (s->last_superframe_len > 0) {
846 // printf("skip=%d\n", s->last_bitoffset);
847 /* add bit_offset bits to last frame */
848 if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) >
849 MAX_CODED_SUPERFRAME_SIZE)
851 q = s->last_superframe + s->last_superframe_len;
854 *q++ = (get_bits)(&s->gb, 8);
858 *q++ = (get_bits)(&s->gb, len) << (8 - len);
861 /* XXX: bit_offset bits into last frame */
862 init_get_bits(&s->gb, s->last_superframe, MAX_CODED_SUPERFRAME_SIZE*8);
863 /* skip unused bits */
864 if (s->last_bitoffset > 0)
865 skip_bits(&s->gb, s->last_bitoffset);
866 /* this frame is stored in the last superframe and in the
868 if (wma_decode_frame(s, samples) < 0)
870 samples += s->nb_channels * s->frame_len;
874 /* read each frame starting from bit_offset */
875 pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
876 init_get_bits(&s->gb, buf + (pos >> 3), (MAX_CODED_SUPERFRAME_SIZE - (pos >> 3))*8);
879 skip_bits(&s->gb, len);
881 s->reset_block_lengths = 1;
882 for(i=0;i<nb_frames;i++) {
883 if (wma_decode_frame(s, samples) < 0)
885 samples += s->nb_channels * s->frame_len;
888 /* we copy the end of the frame in the last frame buffer */
889 pos = get_bits_count(&s->gb) + ((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) < 0)
903 samples += s->nb_channels * s->frame_len;
906 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d outbytes:%d eaten:%d\n", s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len, (int8_t *)samples - (int8_t *)data, s->block_align);
909 *(AVFrame *)data = s->frame;
911 return s->block_align;
913 /* when error, we reset the bit reservoir */
914 s->last_superframe_len = 0;
918 static av_cold void flush(AVCodecContext *avctx)
920 WMACodecContext *s = avctx->priv_data;
923 s->last_superframe_len= 0;
926 AVCodec ff_wmav1_decoder = {
928 .type = AVMEDIA_TYPE_AUDIO,
929 .id = CODEC_ID_WMAV1,
930 .priv_data_size = sizeof(WMACodecContext),
931 .init = wma_decode_init,
933 .decode = wma_decode_superframe,
935 .capabilities = CODEC_CAP_DR1,
936 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
939 AVCodec ff_wmav2_decoder = {
941 .type = AVMEDIA_TYPE_AUDIO,
942 .id = CODEC_ID_WMAV2,
943 .priv_data_size = sizeof(WMACodecContext),
944 .init = wma_decode_init,
946 .decode = wma_decode_superframe,
948 .capabilities = CODEC_CAP_DR1,
949 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),