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
23 * @file libavcodec/wmadec.c
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_wma_scale_huffbits
), //FIXME move out of context
120 ff_wma_scale_huffbits
, 1, 1,
121 ff_wma_scale_huffcodes
, 4, 4, 0);
123 wma_lsp_to_curve_init(s
, s
->frame_len
);
126 avctx
->sample_fmt
= SAMPLE_FMT_S16
;
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 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 */
167 s
->lsp_pow_e_table
[i
] = pow(2.0, 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
;
187 printf("%f^-0.25=%f e=%f\n", v
, r1
, r2
- r1
);
193 * NOTE: We use the same code as Vorbis here
194 * @todo optimize it further with SSE/3Dnow
196 static void wma_lsp_to_curve(WMACodecContext
*s
,
197 float *out
, float *val_max_ptr
,
201 float p
, q
, w
, v
, val_max
;
207 w
= s
->lsp_cos_table
[i
];
208 for(j
=1;j
<NB_LSP_COEFS
;j
+=2){
220 *val_max_ptr
= val_max
;
224 * decode exponents coded with LSP coefficients (same idea as Vorbis)
226 static void decode_exp_lsp(WMACodecContext
*s
, int ch
)
228 float lsp_coefs
[NB_LSP_COEFS
];
231 for(i
= 0; i
< NB_LSP_COEFS
; i
++) {
232 if (i
== 0 || i
>= 8)
233 val
= get_bits(&s
->gb
, 3);
235 val
= get_bits(&s
->gb
, 4);
236 lsp_coefs
[i
] = ff_wma_lsp_codebook
[i
][val
];
239 wma_lsp_to_curve(s
, s
->exponents
[ch
], &s
->max_exponent
[ch
],
240 s
->block_len
, lsp_coefs
);
243 /** pow(10, i / 16.0) for i in -60..67 */
244 static const float pow_tab
[128] = {
245 1.7782794100389e-04, 2.0535250264571e-04,
246 2.3713737056617e-04, 2.7384196342644e-04,
247 3.1622776601684e-04, 3.6517412725484e-04,
248 4.2169650342858e-04, 4.8696752516586e-04,
249 5.6234132519035e-04, 6.4938163157621e-04,
250 7.4989420933246e-04, 8.6596432336006e-04,
251 1.0000000000000e-03, 1.1547819846895e-03,
252 1.3335214321633e-03, 1.5399265260595e-03,
253 1.7782794100389e-03, 2.0535250264571e-03,
254 2.3713737056617e-03, 2.7384196342644e-03,
255 3.1622776601684e-03, 3.6517412725484e-03,
256 4.2169650342858e-03, 4.8696752516586e-03,
257 5.6234132519035e-03, 6.4938163157621e-03,
258 7.4989420933246e-03, 8.6596432336006e-03,
259 1.0000000000000e-02, 1.1547819846895e-02,
260 1.3335214321633e-02, 1.5399265260595e-02,
261 1.7782794100389e-02, 2.0535250264571e-02,
262 2.3713737056617e-02, 2.7384196342644e-02,
263 3.1622776601684e-02, 3.6517412725484e-02,
264 4.2169650342858e-02, 4.8696752516586e-02,
265 5.6234132519035e-02, 6.4938163157621e-02,
266 7.4989420933246e-02, 8.6596432336007e-02,
267 1.0000000000000e-01, 1.1547819846895e-01,
268 1.3335214321633e-01, 1.5399265260595e-01,
269 1.7782794100389e-01, 2.0535250264571e-01,
270 2.3713737056617e-01, 2.7384196342644e-01,
271 3.1622776601684e-01, 3.6517412725484e-01,
272 4.2169650342858e-01, 4.8696752516586e-01,
273 5.6234132519035e-01, 6.4938163157621e-01,
274 7.4989420933246e-01, 8.6596432336007e-01,
275 1.0000000000000e+00, 1.1547819846895e+00,
276 1.3335214321633e+00, 1.5399265260595e+00,
277 1.7782794100389e+00, 2.0535250264571e+00,
278 2.3713737056617e+00, 2.7384196342644e+00,
279 3.1622776601684e+00, 3.6517412725484e+00,
280 4.2169650342858e+00, 4.8696752516586e+00,
281 5.6234132519035e+00, 6.4938163157621e+00,
282 7.4989420933246e+00, 8.6596432336007e+00,
283 1.0000000000000e+01, 1.1547819846895e+01,
284 1.3335214321633e+01, 1.5399265260595e+01,
285 1.7782794100389e+01, 2.0535250264571e+01,
286 2.3713737056617e+01, 2.7384196342644e+01,
287 3.1622776601684e+01, 3.6517412725484e+01,
288 4.2169650342858e+01, 4.8696752516586e+01,
289 5.6234132519035e+01, 6.4938163157621e+01,
290 7.4989420933246e+01, 8.6596432336007e+01,
291 1.0000000000000e+02, 1.1547819846895e+02,
292 1.3335214321633e+02, 1.5399265260595e+02,
293 1.7782794100389e+02, 2.0535250264571e+02,
294 2.3713737056617e+02, 2.7384196342644e+02,
295 3.1622776601684e+02, 3.6517412725484e+02,
296 4.2169650342858e+02, 4.8696752516586e+02,
297 5.6234132519035e+02, 6.4938163157621e+02,
298 7.4989420933246e+02, 8.6596432336007e+02,
299 1.0000000000000e+03, 1.1547819846895e+03,
300 1.3335214321633e+03, 1.5399265260595e+03,
301 1.7782794100389e+03, 2.0535250264571e+03,
302 2.3713737056617e+03, 2.7384196342644e+03,
303 3.1622776601684e+03, 3.6517412725484e+03,
304 4.2169650342858e+03, 4.8696752516586e+03,
305 5.6234132519035e+03, 6.4938163157621e+03,
306 7.4989420933246e+03, 8.6596432336007e+03,
307 1.0000000000000e+04, 1.1547819846895e+04,
308 1.3335214321633e+04, 1.5399265260595e+04,
312 * decode exponents coded with VLC codes
314 static int decode_exp_vlc(WMACodecContext
*s
, int ch
)
316 int last_exp
, n
, code
;
319 uint32_t *q
, *q_end
, iv
;
320 const float *ptab
= pow_tab
+ 60;
321 const uint32_t *iptab
= (const uint32_t*)ptab
;
323 ptr
= s
->exponent_bands
[s
->frame_len_bits
- s
->block_len_bits
];
324 q
= (uint32_t *)s
->exponents
[ch
];
325 q_end
= q
+ s
->block_len
;
327 if (s
->version
== 1) {
328 last_exp
= get_bits(&s
->gb
, 5) + 10;
330 iv
= iptab
[last_exp
];
338 } while ((n
-= 4) > 0);
343 code
= get_vlc2(&s
->gb
, s
->exp_vlc
.table
, EXPVLCBITS
, EXPMAX
);
346 /* NOTE: this offset is the same as MPEG4 AAC ! */
347 last_exp
+= code
- 60;
348 if ((unsigned)last_exp
+ 60 > FF_ARRAY_ELEMS(pow_tab
))
351 iv
= iptab
[last_exp
];
360 } while ((n
-= 4) > 0);
362 s
->max_exponent
[ch
] = max_scale
;
368 * Apply MDCT window and add into output.
370 * We ensure that when the windows overlap their squared sum
371 * is always 1 (MDCT reconstruction rule).
373 static void wma_window(WMACodecContext
*s
, float *out
)
375 float *in
= s
->output
;
376 int block_len
, bsize
, n
;
379 if (s
->block_len_bits
<= s
->prev_block_len_bits
) {
380 block_len
= s
->block_len
;
381 bsize
= s
->frame_len_bits
- s
->block_len_bits
;
383 s
->dsp
.vector_fmul_add(out
, in
, s
->windows
[bsize
],
387 block_len
= 1 << s
->prev_block_len_bits
;
388 n
= (s
->block_len
- block_len
) / 2;
389 bsize
= s
->frame_len_bits
- s
->prev_block_len_bits
;
391 s
->dsp
.vector_fmul_add(out
+n
, in
+n
, s
->windows
[bsize
],
394 memcpy(out
+n
+block_len
, in
+n
+block_len
, n
*sizeof(float));
401 if (s
->block_len_bits
<= s
->next_block_len_bits
) {
402 block_len
= s
->block_len
;
403 bsize
= s
->frame_len_bits
- s
->block_len_bits
;
405 s
->dsp
.vector_fmul_reverse(out
, in
, s
->windows
[bsize
], block_len
);
408 block_len
= 1 << s
->next_block_len_bits
;
409 n
= (s
->block_len
- block_len
) / 2;
410 bsize
= s
->frame_len_bits
- s
->next_block_len_bits
;
412 memcpy(out
, in
, n
*sizeof(float));
414 s
->dsp
.vector_fmul_reverse(out
+n
, in
+n
, s
->windows
[bsize
], block_len
);
416 memset(out
+n
+block_len
, 0, n
*sizeof(float));
422 * @return 0 if OK. 1 if last block of frame. return -1 if
423 * unrecorrable error.
425 static int wma_decode_block(WMACodecContext
*s
)
427 int n
, v
, a
, ch
, bsize
;
428 int coef_nb_bits
, total_gain
;
429 int nb_coefs
[MAX_CHANNELS
];
433 tprintf(s
->avctx
, "***decode_block: %d:%d\n", s
->frame_count
- 1, s
->block_num
);
436 /* compute current block length */
437 if (s
->use_variable_block_len
) {
438 n
= av_log2(s
->nb_block_sizes
- 1) + 1;
440 if (s
->reset_block_lengths
) {
441 s
->reset_block_lengths
= 0;
442 v
= get_bits(&s
->gb
, n
);
443 if (v
>= s
->nb_block_sizes
)
445 s
->prev_block_len_bits
= s
->frame_len_bits
- v
;
446 v
= get_bits(&s
->gb
, n
);
447 if (v
>= s
->nb_block_sizes
)
449 s
->block_len_bits
= s
->frame_len_bits
- v
;
451 /* update block lengths */
452 s
->prev_block_len_bits
= s
->block_len_bits
;
453 s
->block_len_bits
= s
->next_block_len_bits
;
455 v
= get_bits(&s
->gb
, n
);
456 if (v
>= s
->nb_block_sizes
)
458 s
->next_block_len_bits
= s
->frame_len_bits
- v
;
460 /* fixed block len */
461 s
->next_block_len_bits
= s
->frame_len_bits
;
462 s
->prev_block_len_bits
= s
->frame_len_bits
;
463 s
->block_len_bits
= s
->frame_len_bits
;
466 /* now check if the block length is coherent with the frame length */
467 s
->block_len
= 1 << s
->block_len_bits
;
468 if ((s
->block_pos
+ s
->block_len
) > s
->frame_len
)
471 if (s
->nb_channels
== 2) {
472 s
->ms_stereo
= get_bits1(&s
->gb
);
475 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
476 a
= get_bits1(&s
->gb
);
477 s
->channel_coded
[ch
] = a
;
481 bsize
= s
->frame_len_bits
- s
->block_len_bits
;
483 /* if no channel coded, no need to go further */
484 /* XXX: fix potential framing problems */
488 /* read total gain and extract corresponding number of bits for
489 coef escape coding */
492 a
= get_bits(&s
->gb
, 7);
498 coef_nb_bits
= ff_wma_total_gain_to_bits(total_gain
);
500 /* compute number of coefficients */
501 n
= s
->coefs_end
[bsize
] - s
->coefs_start
;
502 for(ch
= 0; ch
< s
->nb_channels
; ch
++)
506 if (s
->use_noise_coding
) {
508 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
509 if (s
->channel_coded
[ch
]) {
511 n
= s
->exponent_high_sizes
[bsize
];
513 a
= get_bits1(&s
->gb
);
514 s
->high_band_coded
[ch
][i
] = a
;
515 /* if noise coding, the coefficients are not transmitted */
517 nb_coefs
[ch
] -= s
->exponent_high_bands
[bsize
][i
];
521 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
522 if (s
->channel_coded
[ch
]) {
525 n
= s
->exponent_high_sizes
[bsize
];
526 val
= (int)0x80000000;
528 if (s
->high_band_coded
[ch
][i
]) {
529 if (val
== (int)0x80000000) {
530 val
= get_bits(&s
->gb
, 7) - 19;
532 code
= get_vlc2(&s
->gb
, s
->hgain_vlc
.table
, HGAINVLCBITS
, HGAINMAX
);
537 s
->high_band_values
[ch
][i
] = val
;
544 /* exponents can be reused in short blocks. */
545 if ((s
->block_len_bits
== s
->frame_len_bits
) ||
547 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
548 if (s
->channel_coded
[ch
]) {
549 if (s
->use_exp_vlc
) {
550 if (decode_exp_vlc(s
, ch
) < 0)
553 decode_exp_lsp(s
, ch
);
555 s
->exponents_bsize
[ch
] = bsize
;
560 /* parse spectral coefficients : just RLE encoding */
561 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
562 if (s
->channel_coded
[ch
]) {
564 WMACoef
* ptr
= &s
->coefs1
[ch
][0];
566 /* special VLC tables are used for ms stereo because
567 there is potentially less energy there */
568 tindex
= (ch
== 1 && s
->ms_stereo
);
569 memset(ptr
, 0, s
->block_len
* sizeof(WMACoef
));
570 ff_wma_run_level_decode(s
->avctx
, &s
->gb
, &s
->coef_vlc
[tindex
],
571 s
->level_table
[tindex
], s
->run_table
[tindex
],
572 0, ptr
, 0, nb_coefs
[ch
],
573 s
->block_len
, s
->frame_len_bits
, coef_nb_bits
);
575 if (s
->version
== 1 && s
->nb_channels
>= 2) {
576 align_get_bits(&s
->gb
);
582 int n4
= s
->block_len
/ 2;
583 mdct_norm
= 1.0 / (float)n4
;
584 if (s
->version
== 1) {
585 mdct_norm
*= sqrt(n4
);
589 /* finally compute the MDCT coefficients */
590 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
591 if (s
->channel_coded
[ch
]) {
593 float *coefs
, *exponents
, mult
, mult1
, noise
;
594 int i
, j
, n
, n1
, last_high_band
, esize
;
595 float exp_power
[HIGH_BAND_MAX_SIZE
];
597 coefs1
= s
->coefs1
[ch
];
598 exponents
= s
->exponents
[ch
];
599 esize
= s
->exponents_bsize
[ch
];
600 mult
= pow(10, total_gain
* 0.05) / s
->max_exponent
[ch
];
602 coefs
= s
->coefs
[ch
];
603 if (s
->use_noise_coding
) {
605 /* very low freqs : noise */
606 for(i
= 0;i
< s
->coefs_start
; i
++) {
607 *coefs
++ = s
->noise_table
[s
->noise_index
] *
608 exponents
[i
<<bsize
>>esize
] * mult1
;
609 s
->noise_index
= (s
->noise_index
+ 1) & (NOISE_TAB_SIZE
- 1);
612 n1
= s
->exponent_high_sizes
[bsize
];
614 /* compute power of high bands */
615 exponents
= s
->exponents
[ch
] +
616 (s
->high_band_start
[bsize
]<<bsize
);
617 last_high_band
= 0; /* avoid warning */
619 n
= s
->exponent_high_bands
[s
->frame_len_bits
-
620 s
->block_len_bits
][j
];
621 if (s
->high_band_coded
[ch
][j
]) {
624 for(i
= 0;i
< n
; i
++) {
625 v
= exponents
[i
<<bsize
>>esize
];
628 exp_power
[j
] = e2
/ n
;
630 tprintf(s
->avctx
, "%d: power=%f (%d)\n", j
, exp_power
[j
], n
);
632 exponents
+= n
<<bsize
;
635 /* main freqs and high freqs */
636 exponents
= s
->exponents
[ch
] + (s
->coefs_start
<<bsize
);
639 n
= s
->high_band_start
[bsize
] -
642 n
= s
->exponent_high_bands
[s
->frame_len_bits
-
643 s
->block_len_bits
][j
];
645 if (j
>= 0 && s
->high_band_coded
[ch
][j
]) {
646 /* use noise with specified power */
647 mult1
= sqrt(exp_power
[j
] / exp_power
[last_high_band
]);
648 /* XXX: use a table */
649 mult1
= mult1
* pow(10, s
->high_band_values
[ch
][j
] * 0.05);
650 mult1
= mult1
/ (s
->max_exponent
[ch
] * s
->noise_mult
);
652 for(i
= 0;i
< n
; i
++) {
653 noise
= s
->noise_table
[s
->noise_index
];
654 s
->noise_index
= (s
->noise_index
+ 1) & (NOISE_TAB_SIZE
- 1);
656 exponents
[i
<<bsize
>>esize
] * mult1
;
658 exponents
+= n
<<bsize
;
660 /* coded values + small noise */
661 for(i
= 0;i
< n
; i
++) {
662 noise
= s
->noise_table
[s
->noise_index
];
663 s
->noise_index
= (s
->noise_index
+ 1) & (NOISE_TAB_SIZE
- 1);
664 *coefs
++ = ((*coefs1
++) + noise
) *
665 exponents
[i
<<bsize
>>esize
] * mult
;
667 exponents
+= n
<<bsize
;
671 /* very high freqs : noise */
672 n
= s
->block_len
- s
->coefs_end
[bsize
];
673 mult1
= mult
* exponents
[((-1<<bsize
))>>esize
];
674 for(i
= 0; i
< n
; i
++) {
675 *coefs
++ = s
->noise_table
[s
->noise_index
] * mult1
;
676 s
->noise_index
= (s
->noise_index
+ 1) & (NOISE_TAB_SIZE
- 1);
679 /* XXX: optimize more */
680 for(i
= 0;i
< s
->coefs_start
; i
++)
683 for(i
= 0;i
< n
; i
++) {
684 *coefs
++ = coefs1
[i
] * exponents
[i
<<bsize
>>esize
] * mult
;
686 n
= s
->block_len
- s
->coefs_end
[bsize
];
687 for(i
= 0;i
< n
; i
++)
694 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
695 if (s
->channel_coded
[ch
]) {
696 dump_floats(s
, "exponents", 3, s
->exponents
[ch
], s
->block_len
);
697 dump_floats(s
, "coefs", 1, s
->coefs
[ch
], s
->block_len
);
702 if (s
->ms_stereo
&& s
->channel_coded
[1]) {
703 /* nominal case for ms stereo: we do it before mdct */
704 /* no need to optimize this case because it should almost
706 if (!s
->channel_coded
[0]) {
707 tprintf(s
->avctx
, "rare ms-stereo case happened\n");
708 memset(s
->coefs
[0], 0, sizeof(float) * s
->block_len
);
709 s
->channel_coded
[0] = 1;
712 s
->dsp
.butterflies_float(s
->coefs
[0], s
->coefs
[1], s
->block_len
);
716 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
719 n4
= s
->block_len
/ 2;
720 if(s
->channel_coded
[ch
]){
721 ff_imdct_calc(&s
->mdct_ctx
[bsize
], s
->output
, s
->coefs
[ch
]);
722 }else if(!(s
->ms_stereo
&& ch
==1))
723 memset(s
->output
, 0, sizeof(s
->output
));
725 /* multiply by the window and add in the frame */
726 index
= (s
->frame_len
/ 2) + s
->block_pos
- n4
;
727 wma_window(s
, &s
->frame_out
[ch
][index
]);
730 /* update block number */
732 s
->block_pos
+= s
->block_len
;
733 if (s
->block_pos
>= s
->frame_len
)
739 /* decode a frame of frame_len samples */
740 static int wma_decode_frame(WMACodecContext
*s
, int16_t *samples
)
742 int ret
, i
, n
, ch
, incr
;
747 tprintf(s
->avctx
, "***decode_frame: %d size=%d\n", s
->frame_count
++, s
->frame_len
);
750 /* read each block */
754 ret
= wma_decode_block(s
);
761 /* convert frame to integer */
763 incr
= s
->nb_channels
;
764 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
766 iptr
= s
->frame_out
[ch
];
769 *ptr
= av_clip_int16(lrintf(*iptr
++));
772 /* prepare for next block */
773 memmove(&s
->frame_out
[ch
][0], &s
->frame_out
[ch
][s
->frame_len
],
774 s
->frame_len
* sizeof(float));
778 dump_shorts(s
, "samples", samples
, n
* s
->nb_channels
);
783 static int wma_decode_superframe(AVCodecContext
*avctx
,
784 void *data
, int *data_size
,
787 const uint8_t *buf
= avpkt
->data
;
788 int buf_size
= avpkt
->size
;
789 WMACodecContext
*s
= avctx
->priv_data
;
790 int nb_frames
, bit_offset
, i
, pos
, len
;
794 tprintf(avctx
, "***decode_superframe:\n");
797 s
->last_superframe_len
= 0;
800 if (buf_size
< s
->block_align
)
802 buf_size
= s
->block_align
;
806 init_get_bits(&s
->gb
, buf
, buf_size
*8);
808 if (s
->use_bit_reservoir
) {
809 /* read super frame header */
810 skip_bits(&s
->gb
, 4); /* super frame index */
811 nb_frames
= get_bits(&s
->gb
, 4) - 1;
813 if((nb_frames
+1) * s
->nb_channels
* s
->frame_len
* sizeof(int16_t) > *data_size
){
814 av_log(s
->avctx
, AV_LOG_ERROR
, "Insufficient output space\n");
818 bit_offset
= get_bits(&s
->gb
, s
->byte_offset_bits
+ 3);
820 if (s
->last_superframe_len
> 0) {
821 // printf("skip=%d\n", s->last_bitoffset);
822 /* add bit_offset bits to last frame */
823 if ((s
->last_superframe_len
+ ((bit_offset
+ 7) >> 3)) >
824 MAX_CODED_SUPERFRAME_SIZE
)
826 q
= s
->last_superframe
+ s
->last_superframe_len
;
829 *q
++ = (get_bits
)(&s
->gb
, 8);
833 *q
++ = (get_bits
)(&s
->gb
, len
) << (8 - len
);
836 /* XXX: bit_offset bits into last frame */
837 init_get_bits(&s
->gb
, s
->last_superframe
, MAX_CODED_SUPERFRAME_SIZE
*8);
838 /* skip unused bits */
839 if (s
->last_bitoffset
> 0)
840 skip_bits(&s
->gb
, s
->last_bitoffset
);
841 /* this frame is stored in the last superframe and in the
843 if (wma_decode_frame(s
, samples
) < 0)
845 samples
+= s
->nb_channels
* s
->frame_len
;
848 /* read each frame starting from bit_offset */
849 pos
= bit_offset
+ 4 + 4 + s
->byte_offset_bits
+ 3;
850 init_get_bits(&s
->gb
, buf
+ (pos
>> 3), (MAX_CODED_SUPERFRAME_SIZE
- (pos
>> 3))*8);
853 skip_bits(&s
->gb
, len
);
855 s
->reset_block_lengths
= 1;
856 for(i
=0;i
<nb_frames
;i
++) {
857 if (wma_decode_frame(s
, samples
) < 0)
859 samples
+= s
->nb_channels
* s
->frame_len
;
862 /* we copy the end of the frame in the last frame buffer */
863 pos
= get_bits_count(&s
->gb
) + ((bit_offset
+ 4 + 4 + s
->byte_offset_bits
+ 3) & ~7);
864 s
->last_bitoffset
= pos
& 7;
866 len
= buf_size
- pos
;
867 if (len
> MAX_CODED_SUPERFRAME_SIZE
|| len
< 0) {
870 s
->last_superframe_len
= len
;
871 memcpy(s
->last_superframe
, buf
+ pos
, len
);
873 if(s
->nb_channels
* s
->frame_len
* sizeof(int16_t) > *data_size
){
874 av_log(s
->avctx
, AV_LOG_ERROR
, "Insufficient output space\n");
877 /* single frame decode */
878 if (wma_decode_frame(s
, samples
) < 0)
880 samples
+= s
->nb_channels
* s
->frame_len
;
883 //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);
885 *data_size
= (int8_t *)samples
- (int8_t *)data
;
886 return s
->block_align
;
888 /* when error, we reset the bit reservoir */
889 s
->last_superframe_len
= 0;
893 AVCodec wmav1_decoder
=
898 sizeof(WMACodecContext
),
902 wma_decode_superframe
,
903 .long_name
= NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
906 AVCodec wmav2_decoder
=
911 sizeof(WMACodecContext
),
915 wma_decode_superframe
,
916 .long_name
= NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),