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
);
244 * decode exponents coded with VLC codes
246 static int decode_exp_vlc(WMACodecContext
*s
, int ch
)
248 int last_exp
, n
, code
;
250 float v
, *q
, max_scale
, *q_end
;
252 ptr
= s
->exponent_bands
[s
->frame_len_bits
- s
->block_len_bits
];
253 q
= s
->exponents
[ch
];
254 q_end
= q
+ s
->block_len
;
256 if (s
->version
== 1) {
257 last_exp
= get_bits(&s
->gb
, 5) + 10;
258 /* XXX: use a table */
259 v
= pow(10, last_exp
* (1.0 / 16.0));
269 code
= get_vlc2(&s
->gb
, s
->exp_vlc
.table
, EXPVLCBITS
, EXPMAX
);
272 /* NOTE: this offset is the same as MPEG4 AAC ! */
273 last_exp
+= code
- 60;
274 /* XXX: use a table */
275 v
= pow(10, last_exp
* (1.0 / 16.0));
283 s
->max_exponent
[ch
] = max_scale
;
289 * Apply MDCT window and add into output.
291 * We ensure that when the windows overlap their squared sum
292 * is always 1 (MDCT reconstruction rule).
294 static void wma_window(WMACodecContext
*s
, float *out
)
296 float *in
= s
->output
;
297 int block_len
, bsize
, n
;
300 if (s
->block_len_bits
<= s
->prev_block_len_bits
) {
301 block_len
= s
->block_len
;
302 bsize
= s
->frame_len_bits
- s
->block_len_bits
;
304 s
->dsp
.vector_fmul_add_add(out
, in
, s
->windows
[bsize
],
305 out
, 0, block_len
, 1);
308 block_len
= 1 << s
->prev_block_len_bits
;
309 n
= (s
->block_len
- block_len
) / 2;
310 bsize
= s
->frame_len_bits
- s
->prev_block_len_bits
;
312 s
->dsp
.vector_fmul_add_add(out
+n
, in
+n
, s
->windows
[bsize
],
313 out
+n
, 0, block_len
, 1);
315 memcpy(out
+n
+block_len
, in
+n
+block_len
, n
*sizeof(float));
322 if (s
->block_len_bits
<= s
->next_block_len_bits
) {
323 block_len
= s
->block_len
;
324 bsize
= s
->frame_len_bits
- s
->block_len_bits
;
326 s
->dsp
.vector_fmul_reverse(out
, in
, s
->windows
[bsize
], block_len
);
329 block_len
= 1 << s
->next_block_len_bits
;
330 n
= (s
->block_len
- block_len
) / 2;
331 bsize
= s
->frame_len_bits
- s
->next_block_len_bits
;
333 memcpy(out
, in
, n
*sizeof(float));
335 s
->dsp
.vector_fmul_reverse(out
+n
, in
+n
, s
->windows
[bsize
], block_len
);
337 memset(out
+n
+block_len
, 0, n
*sizeof(float));
343 * @return 0 if OK. 1 if last block of frame. return -1 if
344 * unrecorrable error.
346 static int wma_decode_block(WMACodecContext
*s
)
348 int n
, v
, a
, ch
, bsize
;
349 int coef_nb_bits
, total_gain
;
350 int nb_coefs
[MAX_CHANNELS
];
354 tprintf(s
->avctx
, "***decode_block: %d:%d\n", s
->frame_count
- 1, s
->block_num
);
357 /* compute current block length */
358 if (s
->use_variable_block_len
) {
359 n
= av_log2(s
->nb_block_sizes
- 1) + 1;
361 if (s
->reset_block_lengths
) {
362 s
->reset_block_lengths
= 0;
363 v
= get_bits(&s
->gb
, n
);
364 if (v
>= s
->nb_block_sizes
)
366 s
->prev_block_len_bits
= s
->frame_len_bits
- v
;
367 v
= get_bits(&s
->gb
, n
);
368 if (v
>= s
->nb_block_sizes
)
370 s
->block_len_bits
= s
->frame_len_bits
- v
;
372 /* update block lengths */
373 s
->prev_block_len_bits
= s
->block_len_bits
;
374 s
->block_len_bits
= s
->next_block_len_bits
;
376 v
= get_bits(&s
->gb
, n
);
377 if (v
>= s
->nb_block_sizes
)
379 s
->next_block_len_bits
= s
->frame_len_bits
- v
;
381 /* fixed block len */
382 s
->next_block_len_bits
= s
->frame_len_bits
;
383 s
->prev_block_len_bits
= s
->frame_len_bits
;
384 s
->block_len_bits
= s
->frame_len_bits
;
387 /* now check if the block length is coherent with the frame length */
388 s
->block_len
= 1 << s
->block_len_bits
;
389 if ((s
->block_pos
+ s
->block_len
) > s
->frame_len
)
392 if (s
->nb_channels
== 2) {
393 s
->ms_stereo
= get_bits1(&s
->gb
);
396 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
397 a
= get_bits1(&s
->gb
);
398 s
->channel_coded
[ch
] = a
;
402 bsize
= s
->frame_len_bits
- s
->block_len_bits
;
404 /* if no channel coded, no need to go further */
405 /* XXX: fix potential framing problems */
409 /* read total gain and extract corresponding number of bits for
410 coef escape coding */
413 a
= get_bits(&s
->gb
, 7);
419 coef_nb_bits
= ff_wma_total_gain_to_bits(total_gain
);
421 /* compute number of coefficients */
422 n
= s
->coefs_end
[bsize
] - s
->coefs_start
;
423 for(ch
= 0; ch
< s
->nb_channels
; ch
++)
427 if (s
->use_noise_coding
) {
429 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
430 if (s
->channel_coded
[ch
]) {
432 n
= s
->exponent_high_sizes
[bsize
];
434 a
= get_bits1(&s
->gb
);
435 s
->high_band_coded
[ch
][i
] = a
;
436 /* if noise coding, the coefficients are not transmitted */
438 nb_coefs
[ch
] -= s
->exponent_high_bands
[bsize
][i
];
442 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
443 if (s
->channel_coded
[ch
]) {
446 n
= s
->exponent_high_sizes
[bsize
];
447 val
= (int)0x80000000;
449 if (s
->high_band_coded
[ch
][i
]) {
450 if (val
== (int)0x80000000) {
451 val
= get_bits(&s
->gb
, 7) - 19;
453 code
= get_vlc2(&s
->gb
, s
->hgain_vlc
.table
, HGAINVLCBITS
, HGAINMAX
);
458 s
->high_band_values
[ch
][i
] = val
;
465 /* exponents can be reused in short blocks. */
466 if ((s
->block_len_bits
== s
->frame_len_bits
) ||
468 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
469 if (s
->channel_coded
[ch
]) {
470 if (s
->use_exp_vlc
) {
471 if (decode_exp_vlc(s
, ch
) < 0)
474 decode_exp_lsp(s
, ch
);
476 s
->exponents_bsize
[ch
] = bsize
;
481 /* parse spectral coefficients : just RLE encoding */
482 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
483 if (s
->channel_coded
[ch
]) {
485 WMACoef
* ptr
= &s
->coefs1
[ch
][0];
487 /* special VLC tables are used for ms stereo because
488 there is potentially less energy there */
489 tindex
= (ch
== 1 && s
->ms_stereo
);
490 memset(ptr
, 0, s
->block_len
* sizeof(WMACoef
));
491 ff_wma_run_level_decode(s
->avctx
, &s
->gb
, &s
->coef_vlc
[tindex
],
492 s
->level_table
[tindex
], s
->run_table
[tindex
],
493 0, ptr
, 0, nb_coefs
[ch
],
494 s
->block_len
, s
->frame_len_bits
, coef_nb_bits
);
496 if (s
->version
== 1 && s
->nb_channels
>= 2) {
497 align_get_bits(&s
->gb
);
503 int n4
= s
->block_len
/ 2;
504 mdct_norm
= 1.0 / (float)n4
;
505 if (s
->version
== 1) {
506 mdct_norm
*= sqrt(n4
);
510 /* finally compute the MDCT coefficients */
511 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
512 if (s
->channel_coded
[ch
]) {
514 float *coefs
, *exponents
, mult
, mult1
, noise
;
515 int i
, j
, n
, n1
, last_high_band
, esize
;
516 float exp_power
[HIGH_BAND_MAX_SIZE
];
518 coefs1
= s
->coefs1
[ch
];
519 exponents
= s
->exponents
[ch
];
520 esize
= s
->exponents_bsize
[ch
];
521 mult
= pow(10, total_gain
* 0.05) / s
->max_exponent
[ch
];
523 coefs
= s
->coefs
[ch
];
524 if (s
->use_noise_coding
) {
526 /* very low freqs : noise */
527 for(i
= 0;i
< s
->coefs_start
; i
++) {
528 *coefs
++ = s
->noise_table
[s
->noise_index
] *
529 exponents
[i
<<bsize
>>esize
] * mult1
;
530 s
->noise_index
= (s
->noise_index
+ 1) & (NOISE_TAB_SIZE
- 1);
533 n1
= s
->exponent_high_sizes
[bsize
];
535 /* compute power of high bands */
536 exponents
= s
->exponents
[ch
] +
537 (s
->high_band_start
[bsize
]<<bsize
);
538 last_high_band
= 0; /* avoid warning */
540 n
= s
->exponent_high_bands
[s
->frame_len_bits
-
541 s
->block_len_bits
][j
];
542 if (s
->high_band_coded
[ch
][j
]) {
545 for(i
= 0;i
< n
; i
++) {
546 v
= exponents
[i
<<bsize
>>esize
];
549 exp_power
[j
] = e2
/ n
;
551 tprintf(s
->avctx
, "%d: power=%f (%d)\n", j
, exp_power
[j
], n
);
553 exponents
+= n
<<bsize
;
556 /* main freqs and high freqs */
557 exponents
= s
->exponents
[ch
] + (s
->coefs_start
<<bsize
);
560 n
= s
->high_band_start
[bsize
] -
563 n
= s
->exponent_high_bands
[s
->frame_len_bits
-
564 s
->block_len_bits
][j
];
566 if (j
>= 0 && s
->high_band_coded
[ch
][j
]) {
567 /* use noise with specified power */
568 mult1
= sqrt(exp_power
[j
] / exp_power
[last_high_band
]);
569 /* XXX: use a table */
570 mult1
= mult1
* pow(10, s
->high_band_values
[ch
][j
] * 0.05);
571 mult1
= mult1
/ (s
->max_exponent
[ch
] * s
->noise_mult
);
573 for(i
= 0;i
< n
; i
++) {
574 noise
= s
->noise_table
[s
->noise_index
];
575 s
->noise_index
= (s
->noise_index
+ 1) & (NOISE_TAB_SIZE
- 1);
577 exponents
[i
<<bsize
>>esize
] * mult1
;
579 exponents
+= n
<<bsize
;
581 /* coded values + small noise */
582 for(i
= 0;i
< n
; i
++) {
583 noise
= s
->noise_table
[s
->noise_index
];
584 s
->noise_index
= (s
->noise_index
+ 1) & (NOISE_TAB_SIZE
- 1);
585 *coefs
++ = ((*coefs1
++) + noise
) *
586 exponents
[i
<<bsize
>>esize
] * mult
;
588 exponents
+= n
<<bsize
;
592 /* very high freqs : noise */
593 n
= s
->block_len
- s
->coefs_end
[bsize
];
594 mult1
= mult
* exponents
[((-1<<bsize
))>>esize
];
595 for(i
= 0; i
< n
; i
++) {
596 *coefs
++ = s
->noise_table
[s
->noise_index
] * mult1
;
597 s
->noise_index
= (s
->noise_index
+ 1) & (NOISE_TAB_SIZE
- 1);
600 /* XXX: optimize more */
601 for(i
= 0;i
< s
->coefs_start
; i
++)
604 for(i
= 0;i
< n
; i
++) {
605 *coefs
++ = coefs1
[i
] * exponents
[i
<<bsize
>>esize
] * mult
;
607 n
= s
->block_len
- s
->coefs_end
[bsize
];
608 for(i
= 0;i
< n
; i
++)
615 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
616 if (s
->channel_coded
[ch
]) {
617 dump_floats(s
, "exponents", 3, s
->exponents
[ch
], s
->block_len
);
618 dump_floats(s
, "coefs", 1, s
->coefs
[ch
], s
->block_len
);
623 if (s
->ms_stereo
&& s
->channel_coded
[1]) {
624 /* nominal case for ms stereo: we do it before mdct */
625 /* no need to optimize this case because it should almost
627 if (!s
->channel_coded
[0]) {
628 tprintf(s
->avctx
, "rare ms-stereo case happened\n");
629 memset(s
->coefs
[0], 0, sizeof(float) * s
->block_len
);
630 s
->channel_coded
[0] = 1;
633 s
->dsp
.butterflies_float(s
->coefs
[0], s
->coefs
[1], s
->block_len
);
637 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
640 n4
= s
->block_len
/ 2;
641 if(s
->channel_coded
[ch
]){
642 ff_imdct_calc(&s
->mdct_ctx
[bsize
], s
->output
, s
->coefs
[ch
]);
643 }else if(!(s
->ms_stereo
&& ch
==1))
644 memset(s
->output
, 0, sizeof(s
->output
));
646 /* multiply by the window and add in the frame */
647 index
= (s
->frame_len
/ 2) + s
->block_pos
- n4
;
648 wma_window(s
, &s
->frame_out
[ch
][index
]);
651 /* update block number */
653 s
->block_pos
+= s
->block_len
;
654 if (s
->block_pos
>= s
->frame_len
)
660 /* decode a frame of frame_len samples */
661 static int wma_decode_frame(WMACodecContext
*s
, int16_t *samples
)
663 int ret
, i
, n
, ch
, incr
;
668 tprintf(s
->avctx
, "***decode_frame: %d size=%d\n", s
->frame_count
++, s
->frame_len
);
671 /* read each block */
675 ret
= wma_decode_block(s
);
682 /* convert frame to integer */
684 incr
= s
->nb_channels
;
685 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
687 iptr
= s
->frame_out
[ch
];
690 *ptr
= av_clip_int16(lrintf(*iptr
++));
693 /* prepare for next block */
694 memmove(&s
->frame_out
[ch
][0], &s
->frame_out
[ch
][s
->frame_len
],
695 s
->frame_len
* sizeof(float));
699 dump_shorts(s
, "samples", samples
, n
* s
->nb_channels
);
704 static int wma_decode_superframe(AVCodecContext
*avctx
,
705 void *data
, int *data_size
,
708 const uint8_t *buf
= avpkt
->data
;
709 int buf_size
= avpkt
->size
;
710 WMACodecContext
*s
= avctx
->priv_data
;
711 int nb_frames
, bit_offset
, i
, pos
, len
;
715 tprintf(avctx
, "***decode_superframe:\n");
718 s
->last_superframe_len
= 0;
721 if (buf_size
< s
->block_align
)
723 buf_size
= s
->block_align
;
727 init_get_bits(&s
->gb
, buf
, buf_size
*8);
729 if (s
->use_bit_reservoir
) {
730 /* read super frame header */
731 skip_bits(&s
->gb
, 4); /* super frame index */
732 nb_frames
= get_bits(&s
->gb
, 4) - 1;
734 if((nb_frames
+1) * s
->nb_channels
* s
->frame_len
* sizeof(int16_t) > *data_size
){
735 av_log(s
->avctx
, AV_LOG_ERROR
, "Insufficient output space\n");
739 bit_offset
= get_bits(&s
->gb
, s
->byte_offset_bits
+ 3);
741 if (s
->last_superframe_len
> 0) {
742 // printf("skip=%d\n", s->last_bitoffset);
743 /* add bit_offset bits to last frame */
744 if ((s
->last_superframe_len
+ ((bit_offset
+ 7) >> 3)) >
745 MAX_CODED_SUPERFRAME_SIZE
)
747 q
= s
->last_superframe
+ s
->last_superframe_len
;
750 *q
++ = (get_bits
)(&s
->gb
, 8);
754 *q
++ = (get_bits
)(&s
->gb
, len
) << (8 - len
);
757 /* XXX: bit_offset bits into last frame */
758 init_get_bits(&s
->gb
, s
->last_superframe
, MAX_CODED_SUPERFRAME_SIZE
*8);
759 /* skip unused bits */
760 if (s
->last_bitoffset
> 0)
761 skip_bits(&s
->gb
, s
->last_bitoffset
);
762 /* this frame is stored in the last superframe and in the
764 if (wma_decode_frame(s
, samples
) < 0)
766 samples
+= s
->nb_channels
* s
->frame_len
;
769 /* read each frame starting from bit_offset */
770 pos
= bit_offset
+ 4 + 4 + s
->byte_offset_bits
+ 3;
771 init_get_bits(&s
->gb
, buf
+ (pos
>> 3), (MAX_CODED_SUPERFRAME_SIZE
- (pos
>> 3))*8);
774 skip_bits(&s
->gb
, len
);
776 s
->reset_block_lengths
= 1;
777 for(i
=0;i
<nb_frames
;i
++) {
778 if (wma_decode_frame(s
, samples
) < 0)
780 samples
+= s
->nb_channels
* s
->frame_len
;
783 /* we copy the end of the frame in the last frame buffer */
784 pos
= get_bits_count(&s
->gb
) + ((bit_offset
+ 4 + 4 + s
->byte_offset_bits
+ 3) & ~7);
785 s
->last_bitoffset
= pos
& 7;
787 len
= buf_size
- pos
;
788 if (len
> MAX_CODED_SUPERFRAME_SIZE
|| len
< 0) {
791 s
->last_superframe_len
= len
;
792 memcpy(s
->last_superframe
, buf
+ pos
, len
);
794 if(s
->nb_channels
* s
->frame_len
* sizeof(int16_t) > *data_size
){
795 av_log(s
->avctx
, AV_LOG_ERROR
, "Insufficient output space\n");
798 /* single frame decode */
799 if (wma_decode_frame(s
, samples
) < 0)
801 samples
+= s
->nb_channels
* s
->frame_len
;
804 //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);
806 *data_size
= (int8_t *)samples
- (int8_t *)data
;
807 return s
->block_align
;
809 /* when error, we reset the bit reservoir */
810 s
->last_superframe_len
= 0;
814 AVCodec wmav1_decoder
=
819 sizeof(WMACodecContext
),
823 wma_decode_superframe
,
824 .long_name
= NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
827 AVCodec wmav2_decoder
=
832 sizeof(WMACodecContext
),
836 wma_decode_superframe
,
837 .long_name
= NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),