2 * WMA compatible decoder
3 * Copyright (c) 2002 The FFmpeg Project.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 * WMA compatible decoder.
23 * This decoder handles Microsoft Windows Media Audio data, versions 1 & 2.
24 * WMA v1 is identified by audio format 0x160 in Microsoft media files
25 * (ASF/AVI/WAV). WMA v2 is identified by audio format 0x161.
27 * To use this decoder, a calling application must supply the extra data
28 * bytes provided with the WMA data. These are the extra, codec-specific
29 * bytes at the end of a WAVEFORMATEX data structure. Transmit these bytes
30 * to the decoder using the extradata[_size] fields in AVCodecContext. There
31 * should be 4 extra bytes for v1 data and 6 extra bytes for v2 data.
35 #include "bitstream.h"
39 #define BLOCK_MIN_BITS 7
40 #define BLOCK_MAX_BITS 11
41 #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
43 #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
45 /* XXX: find exact max size */
46 #define HIGH_BAND_MAX_SIZE 16
48 #define NB_LSP_COEFS 10
50 /* XXX: is it a suitable value ? */
51 #define MAX_CODED_SUPERFRAME_SIZE 16384
53 #define MAX_CHANNELS 2
55 #define NOISE_TAB_SIZE 8192
57 #define LSP_POW_BITS 7
60 #define VLCMAX ((22+VLCBITS-1)/VLCBITS)
63 #define EXPMAX ((19+EXPVLCBITS-1)/EXPVLCBITS)
65 #define HGAINVLCBITS 9
66 #define HGAINMAX ((13+HGAINVLCBITS-1)/HGAINVLCBITS)
68 typedef struct WMADecodeContext
{
73 int version
; /* 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) */
75 int use_bit_reservoir
;
76 int use_variable_block_len
;
77 int use_exp_vlc
; /* exponent coding: 0 = lsp, 1 = vlc + delta */
78 int use_noise_coding
; /* true if perceptual noise is added */
81 int exponent_sizes
[BLOCK_NB_SIZES
];
82 uint16_t exponent_bands
[BLOCK_NB_SIZES
][25];
83 int high_band_start
[BLOCK_NB_SIZES
]; /* index of first coef in high band */
84 int coefs_start
; /* first coded coef */
85 int coefs_end
[BLOCK_NB_SIZES
]; /* max number of coded coefficients */
86 int exponent_high_sizes
[BLOCK_NB_SIZES
];
87 int exponent_high_bands
[BLOCK_NB_SIZES
][HIGH_BAND_MAX_SIZE
];
90 /* coded values in high bands */
91 int high_band_coded
[MAX_CHANNELS
][HIGH_BAND_MAX_SIZE
];
92 int high_band_values
[MAX_CHANNELS
][HIGH_BAND_MAX_SIZE
];
94 /* there are two possible tables for spectral coefficients */
96 uint16_t *run_table
[2];
97 uint16_t *level_table
[2];
99 int frame_len
; /* frame length in samples */
100 int frame_len_bits
; /* frame_len = 1 << frame_len_bits */
101 int nb_block_sizes
; /* number of block sizes */
103 int reset_block_lengths
;
104 int block_len_bits
; /* log2 of current block length */
105 int next_block_len_bits
; /* log2 of next block length */
106 int prev_block_len_bits
; /* log2 of prev block length */
107 int block_len
; /* block length in samples */
108 int block_num
; /* block number in current frame */
109 int block_pos
; /* current position in frame */
110 uint8_t ms_stereo
; /* true if mid/side stereo mode */
111 uint8_t channel_coded
[MAX_CHANNELS
]; /* true if channel is coded */
112 DECLARE_ALIGNED_16(float, exponents
[MAX_CHANNELS
][BLOCK_MAX_SIZE
]);
113 float max_exponent
[MAX_CHANNELS
];
114 int16_t coefs1
[MAX_CHANNELS
][BLOCK_MAX_SIZE
];
115 DECLARE_ALIGNED_16(float, coefs
[MAX_CHANNELS
][BLOCK_MAX_SIZE
]);
116 MDCTContext mdct_ctx
[BLOCK_NB_SIZES
];
117 float *windows
[BLOCK_NB_SIZES
];
118 DECLARE_ALIGNED_16(FFTSample
, mdct_tmp
[BLOCK_MAX_SIZE
]); /* temporary storage for imdct */
119 /* output buffer for one frame and the last for IMDCT windowing */
120 DECLARE_ALIGNED_16(float, frame_out
[MAX_CHANNELS
][BLOCK_MAX_SIZE
* 2]);
121 /* last frame info */
122 uint8_t last_superframe
[MAX_CODED_SUPERFRAME_SIZE
+ 4]; /* padding added */
124 int last_superframe_len
;
125 float noise_table
[NOISE_TAB_SIZE
];
127 float noise_mult
; /* XXX: suppress that and integrate it in the noise array */
128 /* lsp_to_curve tables */
129 float lsp_cos_table
[BLOCK_MAX_SIZE
];
130 float lsp_pow_e_table
[256];
131 float lsp_pow_m_table1
[(1 << LSP_POW_BITS
)];
132 float lsp_pow_m_table2
[(1 << LSP_POW_BITS
)];
139 typedef struct CoefVLCTable
{
140 int n
; /* total number of codes */
141 const uint32_t *huffcodes
; /* VLC bit values */
142 const uint8_t *huffbits
; /* VLC bit size */
143 const uint16_t *levels
; /* table to build run/level tables */
146 static void wma_lsp_to_curve_init(WMADecodeContext
*s
, int frame_len
);
151 static void dump_shorts(const char *name
, const short *tab
, int n
)
155 tprintf("%s[%d]:\n", name
, n
);
159 tprintf(" %5d.0", tab
[i
]);
165 static void dump_floats(const char *name
, int prec
, const float *tab
, int n
)
169 tprintf("%s[%d]:\n", name
, n
);
173 tprintf(" %8.*f", prec
, tab
[i
]);
182 /* XXX: use same run/length optimization as mpeg decoders */
183 static void init_coef_vlc(VLC
*vlc
,
184 uint16_t **prun_table
, uint16_t **plevel_table
,
185 const CoefVLCTable
*vlc_table
)
187 int n
= vlc_table
->n
;
188 const uint8_t *table_bits
= vlc_table
->huffbits
;
189 const uint32_t *table_codes
= vlc_table
->huffcodes
;
190 const uint16_t *levels_table
= vlc_table
->levels
;
191 uint16_t *run_table
, *level_table
;
195 init_vlc(vlc
, VLCBITS
, n
, table_bits
, 1, 1, table_codes
, 4, 4, 0);
197 run_table
= av_malloc(n
* sizeof(uint16_t));
198 level_table
= av_malloc(n
* sizeof(uint16_t));
206 level_table
[i
] = level
;
211 *prun_table
= run_table
;
212 *plevel_table
= level_table
;
215 static int wma_decode_init(AVCodecContext
* avctx
)
217 WMADecodeContext
*s
= avctx
->priv_data
;
218 int i
, flags1
, flags2
;
221 float bps1
, high_freq
;
226 s
->sample_rate
= avctx
->sample_rate
;
227 s
->nb_channels
= avctx
->channels
;
228 s
->bit_rate
= avctx
->bit_rate
;
229 s
->block_align
= avctx
->block_align
;
231 if (avctx
->codec
->id
== CODEC_ID_WMAV1
) {
237 /* extract flag infos */
240 extradata
= avctx
->extradata
;
241 if (s
->version
== 1 && avctx
->extradata_size
>= 4) {
242 flags1
= extradata
[0] | (extradata
[1] << 8);
243 flags2
= extradata
[2] | (extradata
[3] << 8);
244 } else if (s
->version
== 2 && avctx
->extradata_size
>= 6) {
245 flags1
= extradata
[0] | (extradata
[1] << 8) |
246 (extradata
[2] << 16) | (extradata
[3] << 24);
247 flags2
= extradata
[4] | (extradata
[5] << 8);
249 s
->use_exp_vlc
= flags2
& 0x0001;
250 s
->use_bit_reservoir
= flags2
& 0x0002;
251 s
->use_variable_block_len
= flags2
& 0x0004;
253 /* compute MDCT block size */
254 if (s
->sample_rate
<= 16000) {
255 s
->frame_len_bits
= 9;
256 } else if (s
->sample_rate
<= 22050 ||
257 (s
->sample_rate
<= 32000 && s
->version
== 1)) {
258 s
->frame_len_bits
= 10;
260 s
->frame_len_bits
= 11;
262 s
->frame_len
= 1 << s
->frame_len_bits
;
263 if (s
->use_variable_block_len
) {
265 nb
= ((flags2
>> 3) & 3) + 1;
266 if ((s
->bit_rate
/ s
->nb_channels
) >= 32000)
268 nb_max
= s
->frame_len_bits
- BLOCK_MIN_BITS
;
271 s
->nb_block_sizes
= nb
+ 1;
273 s
->nb_block_sizes
= 1;
276 /* init rate dependant parameters */
277 s
->use_noise_coding
= 1;
278 high_freq
= s
->sample_rate
* 0.5;
280 /* if version 2, then the rates are normalized */
281 sample_rate1
= s
->sample_rate
;
282 if (s
->version
== 2) {
283 if (sample_rate1
>= 44100)
284 sample_rate1
= 44100;
285 else if (sample_rate1
>= 22050)
286 sample_rate1
= 22050;
287 else if (sample_rate1
>= 16000)
288 sample_rate1
= 16000;
289 else if (sample_rate1
>= 11025)
290 sample_rate1
= 11025;
291 else if (sample_rate1
>= 8000)
295 bps
= (float)s
->bit_rate
/ (float)(s
->nb_channels
* s
->sample_rate
);
296 s
->byte_offset_bits
= av_log2((int)(bps
* s
->frame_len
/ 8.0 + 0.5)) + 2;
298 /* compute high frequency value and choose if noise coding should
301 if (s
->nb_channels
== 2)
303 if (sample_rate1
== 44100) {
305 s
->use_noise_coding
= 0;
307 high_freq
= high_freq
* 0.4;
308 } else if (sample_rate1
== 22050) {
310 s
->use_noise_coding
= 0;
311 else if (bps1
>= 0.72)
312 high_freq
= high_freq
* 0.7;
314 high_freq
= high_freq
* 0.6;
315 } else if (sample_rate1
== 16000) {
317 high_freq
= high_freq
* 0.5;
319 high_freq
= high_freq
* 0.3;
320 } else if (sample_rate1
== 11025) {
321 high_freq
= high_freq
* 0.7;
322 } else if (sample_rate1
== 8000) {
324 high_freq
= high_freq
* 0.5;
325 } else if (bps
> 0.75) {
326 s
->use_noise_coding
= 0;
328 high_freq
= high_freq
* 0.65;
332 high_freq
= high_freq
* 0.75;
333 } else if (bps
>= 0.6) {
334 high_freq
= high_freq
* 0.6;
336 high_freq
= high_freq
* 0.5;
339 dprintf("flags1=0x%x flags2=0x%x\n", flags1
, flags2
);
340 dprintf("version=%d channels=%d sample_rate=%d bitrate=%d block_align=%d\n",
341 s
->version
, s
->nb_channels
, s
->sample_rate
, s
->bit_rate
,
343 dprintf("bps=%f bps1=%f high_freq=%f bitoffset=%d\n",
344 bps
, bps1
, high_freq
, s
->byte_offset_bits
);
345 dprintf("use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
346 s
->use_noise_coding
, s
->use_exp_vlc
, s
->nb_block_sizes
);
348 /* compute the scale factor band sizes for each MDCT block size */
350 int a
, b
, pos
, lpos
, k
, block_len
, i
, j
, n
;
351 const uint8_t *table
;
353 if (s
->version
== 1) {
358 for(k
= 0; k
< s
->nb_block_sizes
; k
++) {
359 block_len
= s
->frame_len
>> k
;
361 if (s
->version
== 1) {
364 a
= wma_critical_freqs
[i
];
366 pos
= ((block_len
* 2 * a
) + (b
>> 1)) / b
;
369 s
->exponent_bands
[0][i
] = pos
- lpos
;
370 if (pos
>= block_len
) {
376 s
->exponent_sizes
[0] = i
;
378 /* hardcoded tables */
380 a
= s
->frame_len_bits
- BLOCK_MIN_BITS
- k
;
382 if (s
->sample_rate
>= 44100)
383 table
= exponent_band_44100
[a
];
384 else if (s
->sample_rate
>= 32000)
385 table
= exponent_band_32000
[a
];
386 else if (s
->sample_rate
>= 22050)
387 table
= exponent_band_22050
[a
];
392 s
->exponent_bands
[k
][i
] = table
[i
];
393 s
->exponent_sizes
[k
] = n
;
398 a
= wma_critical_freqs
[i
];
400 pos
= ((block_len
* 2 * a
) + (b
<< 1)) / (4 * b
);
405 s
->exponent_bands
[k
][j
++] = pos
- lpos
;
406 if (pos
>= block_len
)
410 s
->exponent_sizes
[k
] = j
;
414 /* max number of coefs */
415 s
->coefs_end
[k
] = (s
->frame_len
- ((s
->frame_len
* 9) / 100)) >> k
;
416 /* high freq computation */
417 s
->high_band_start
[k
] = (int)((block_len
* 2 * high_freq
) /
418 s
->sample_rate
+ 0.5);
419 n
= s
->exponent_sizes
[k
];
425 pos
+= s
->exponent_bands
[k
][i
];
427 if (start
< s
->high_band_start
[k
])
428 start
= s
->high_band_start
[k
];
429 if (end
> s
->coefs_end
[k
])
430 end
= s
->coefs_end
[k
];
432 s
->exponent_high_bands
[k
][j
++] = end
- start
;
434 s
->exponent_high_sizes
[k
] = j
;
436 tprintf("%5d: coefs_end=%d high_band_start=%d nb_high_bands=%d: ",
439 s
->high_band_start
[k
],
440 s
->exponent_high_sizes
[k
]);
441 for(j
=0;j
<s
->exponent_high_sizes
[k
];j
++)
442 tprintf(" %d", s
->exponent_high_bands
[k
][j
]);
451 for(i
= 0; i
< s
->nb_block_sizes
; i
++) {
452 tprintf("%5d: n=%2d:",
454 s
->exponent_sizes
[i
]);
455 for(j
=0;j
<s
->exponent_sizes
[i
];j
++)
456 tprintf(" %d", s
->exponent_bands
[i
][j
]);
463 for(i
= 0; i
< s
->nb_block_sizes
; i
++)
464 ff_mdct_init(&s
->mdct_ctx
[i
], s
->frame_len_bits
- i
+ 1, 1);
466 /* init MDCT windows : simple sinus window */
467 for(i
= 0; i
< s
->nb_block_sizes
; i
++) {
470 n
= 1 << (s
->frame_len_bits
- i
);
471 window
= av_malloc(sizeof(float) * n
);
472 alpha
= M_PI
/ (2.0 * n
);
474 window
[n
- j
- 1] = sin((j
+ 0.5) * alpha
);
476 s
->windows
[i
] = window
;
479 s
->reset_block_lengths
= 1;
481 if (s
->use_noise_coding
) {
483 /* init the noise generator */
485 s
->noise_mult
= 0.02;
487 s
->noise_mult
= 0.04;
490 for(i
=0;i
<NOISE_TAB_SIZE
;i
++)
491 s
->noise_table
[i
] = 1.0 * s
->noise_mult
;
497 norm
= (1.0 / (float)(1LL << 31)) * sqrt(3) * s
->noise_mult
;
498 for(i
=0;i
<NOISE_TAB_SIZE
;i
++) {
499 seed
= seed
* 314159 + 1;
500 s
->noise_table
[i
] = (float)((int)seed
) * norm
;
504 init_vlc(&s
->hgain_vlc
, HGAINVLCBITS
, sizeof(hgain_huffbits
),
505 hgain_huffbits
, 1, 1,
506 hgain_huffcodes
, 2, 2, 0);
509 if (s
->use_exp_vlc
) {
510 init_vlc(&s
->exp_vlc
, EXPVLCBITS
, sizeof(scale_huffbits
),
511 scale_huffbits
, 1, 1,
512 scale_huffcodes
, 4, 4, 0);
514 wma_lsp_to_curve_init(s
, s
->frame_len
);
517 /* choose the VLC tables for the coefficients */
519 if (s
->sample_rate
>= 32000) {
522 else if (bps1
< 1.16)
526 init_coef_vlc(&s
->coef_vlc
[0], &s
->run_table
[0], &s
->level_table
[0],
527 &coef_vlcs
[coef_vlc_table
* 2]);
528 init_coef_vlc(&s
->coef_vlc
[1], &s
->run_table
[1], &s
->level_table
[1],
529 &coef_vlcs
[coef_vlc_table
* 2 + 1]);
533 /* interpolate values for a bigger or smaller block. The block must
534 have multiple sizes */
535 static void interpolate_array(float *scale
, int old_size
, int new_size
)
540 if (new_size
> old_size
) {
541 jincr
= new_size
/ old_size
;
543 for(i
= old_size
- 1; i
>=0; i
--) {
550 } else if (new_size
< old_size
) {
552 jincr
= old_size
/ new_size
;
553 for(i
= 0; i
< new_size
; i
++) {
560 /* compute x^-0.25 with an exponent and mantissa table. We use linear
561 interpolation to reduce the mantissa table size at a small speed
562 expense (linear interpolation approximately doubles the number of
563 bits of precision). */
564 static inline float pow_m1_4(WMADecodeContext
*s
, float x
)
575 m
= (u
.v
>> (23 - LSP_POW_BITS
)) & ((1 << LSP_POW_BITS
) - 1);
576 /* build interpolation scale: 1 <= t < 2. */
577 t
.v
= ((u
.v
<< LSP_POW_BITS
) & ((1 << 23) - 1)) | (127 << 23);
578 a
= s
->lsp_pow_m_table1
[m
];
579 b
= s
->lsp_pow_m_table2
[m
];
580 return s
->lsp_pow_e_table
[e
] * (a
+ b
* t
.f
);
583 static void wma_lsp_to_curve_init(WMADecodeContext
*s
, int frame_len
)
588 wdel
= M_PI
/ frame_len
;
589 for(i
=0;i
<frame_len
;i
++)
590 s
->lsp_cos_table
[i
] = 2.0f
* cos(wdel
* i
);
592 /* tables for x^-0.25 computation */
595 s
->lsp_pow_e_table
[i
] = pow(2.0, e
* -0.25);
598 /* NOTE: these two tables are needed to avoid two operations in
601 for(i
=(1 << LSP_POW_BITS
) - 1;i
>=0;i
--) {
602 m
= (1 << LSP_POW_BITS
) + i
;
603 a
= (float)m
* (0.5 / (1 << LSP_POW_BITS
));
605 s
->lsp_pow_m_table1
[i
] = 2 * a
- b
;
606 s
->lsp_pow_m_table2
[i
] = b
- a
;
615 printf("%f^-0.25=%f e=%f\n", v
, r1
, r2
- r1
);
620 /* NOTE: We use the same code as Vorbis here */
621 /* XXX: optimize it further with SSE/3Dnow */
622 static void wma_lsp_to_curve(WMADecodeContext
*s
,
623 float *out
, float *val_max_ptr
,
627 float p
, q
, w
, v
, val_max
;
633 w
= s
->lsp_cos_table
[i
];
634 for(j
=1;j
<NB_LSP_COEFS
;j
+=2){
646 *val_max_ptr
= val_max
;
649 /* decode exponents coded with LSP coefficients (same idea as Vorbis) */
650 static void decode_exp_lsp(WMADecodeContext
*s
, int ch
)
652 float lsp_coefs
[NB_LSP_COEFS
];
655 for(i
= 0; i
< NB_LSP_COEFS
; i
++) {
656 if (i
== 0 || i
>= 8)
657 val
= get_bits(&s
->gb
, 3);
659 val
= get_bits(&s
->gb
, 4);
660 lsp_coefs
[i
] = lsp_codebook
[i
][val
];
663 wma_lsp_to_curve(s
, s
->exponents
[ch
], &s
->max_exponent
[ch
],
664 s
->block_len
, lsp_coefs
);
667 /* decode exponents coded with VLC codes */
668 static int decode_exp_vlc(WMADecodeContext
*s
, int ch
)
670 int last_exp
, n
, code
;
671 const uint16_t *ptr
, *band_ptr
;
672 float v
, *q
, max_scale
, *q_end
;
674 band_ptr
= s
->exponent_bands
[s
->frame_len_bits
- s
->block_len_bits
];
676 q
= s
->exponents
[ch
];
677 q_end
= q
+ s
->block_len
;
679 if (s
->version
== 1) {
680 last_exp
= get_bits(&s
->gb
, 5) + 10;
681 /* XXX: use a table */
682 v
= pow(10, last_exp
* (1.0 / 16.0));
691 code
= get_vlc2(&s
->gb
, s
->exp_vlc
.table
, EXPVLCBITS
, EXPMAX
);
694 /* NOTE: this offset is the same as MPEG4 AAC ! */
695 last_exp
+= code
- 60;
696 /* XXX: use a table */
697 v
= pow(10, last_exp
* (1.0 / 16.0));
705 s
->max_exponent
[ch
] = max_scale
;
709 /* return 0 if OK. return 1 if last block of frame. return -1 if
710 unrecorrable error. */
711 static int wma_decode_block(WMADecodeContext
*s
)
713 int n
, v
, a
, ch
, code
, bsize
;
714 int coef_nb_bits
, total_gain
, parse_exponents
;
715 float window
[BLOCK_MAX_SIZE
* 2];
716 // XXX: FIXME!! there's a bug somewhere which makes this mandatory under altivec
718 volatile int nb_coefs
[MAX_CHANNELS
] __attribute__((aligned(16)));
720 int nb_coefs
[MAX_CHANNELS
];
725 tprintf("***decode_block: %d:%d\n", s
->frame_count
- 1, s
->block_num
);
728 /* compute current block length */
729 if (s
->use_variable_block_len
) {
730 n
= av_log2(s
->nb_block_sizes
- 1) + 1;
732 if (s
->reset_block_lengths
) {
733 s
->reset_block_lengths
= 0;
734 v
= get_bits(&s
->gb
, n
);
735 if (v
>= s
->nb_block_sizes
)
737 s
->prev_block_len_bits
= s
->frame_len_bits
- v
;
738 v
= get_bits(&s
->gb
, n
);
739 if (v
>= s
->nb_block_sizes
)
741 s
->block_len_bits
= s
->frame_len_bits
- v
;
743 /* update block lengths */
744 s
->prev_block_len_bits
= s
->block_len_bits
;
745 s
->block_len_bits
= s
->next_block_len_bits
;
747 v
= get_bits(&s
->gb
, n
);
748 if (v
>= s
->nb_block_sizes
)
750 s
->next_block_len_bits
= s
->frame_len_bits
- v
;
752 /* fixed block len */
753 s
->next_block_len_bits
= s
->frame_len_bits
;
754 s
->prev_block_len_bits
= s
->frame_len_bits
;
755 s
->block_len_bits
= s
->frame_len_bits
;
758 /* now check if the block length is coherent with the frame length */
759 s
->block_len
= 1 << s
->block_len_bits
;
760 if ((s
->block_pos
+ s
->block_len
) > s
->frame_len
)
763 if (s
->nb_channels
== 2) {
764 s
->ms_stereo
= get_bits(&s
->gb
, 1);
767 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
768 a
= get_bits(&s
->gb
, 1);
769 s
->channel_coded
[ch
] = a
;
772 /* if no channel coded, no need to go further */
773 /* XXX: fix potential framing problems */
777 bsize
= s
->frame_len_bits
- s
->block_len_bits
;
779 /* read total gain and extract corresponding number of bits for
780 coef escape coding */
783 a
= get_bits(&s
->gb
, 7);
791 else if (total_gain
< 32)
793 else if (total_gain
< 40)
795 else if (total_gain
< 45)
800 /* compute number of coefficients */
801 n
= s
->coefs_end
[bsize
] - s
->coefs_start
;
802 for(ch
= 0; ch
< s
->nb_channels
; ch
++)
806 if (s
->use_noise_coding
) {
808 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
809 if (s
->channel_coded
[ch
]) {
811 n
= s
->exponent_high_sizes
[bsize
];
813 a
= get_bits(&s
->gb
, 1);
814 s
->high_band_coded
[ch
][i
] = a
;
815 /* if noise coding, the coefficients are not transmitted */
817 nb_coefs
[ch
] -= s
->exponent_high_bands
[bsize
][i
];
821 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
822 if (s
->channel_coded
[ch
]) {
825 n
= s
->exponent_high_sizes
[bsize
];
826 val
= (int)0x80000000;
828 if (s
->high_band_coded
[ch
][i
]) {
829 if (val
== (int)0x80000000) {
830 val
= get_bits(&s
->gb
, 7) - 19;
832 code
= get_vlc2(&s
->gb
, s
->hgain_vlc
.table
, HGAINVLCBITS
, HGAINMAX
);
837 s
->high_band_values
[ch
][i
] = val
;
844 /* exposant can be interpolated in short blocks. */
846 if (s
->block_len_bits
!= s
->frame_len_bits
) {
847 parse_exponents
= get_bits(&s
->gb
, 1);
850 if (parse_exponents
) {
851 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
852 if (s
->channel_coded
[ch
]) {
853 if (s
->use_exp_vlc
) {
854 if (decode_exp_vlc(s
, ch
) < 0)
857 decode_exp_lsp(s
, ch
);
862 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
863 if (s
->channel_coded
[ch
]) {
864 interpolate_array(s
->exponents
[ch
], 1 << s
->prev_block_len_bits
,
870 /* parse spectral coefficients : just RLE encoding */
871 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
872 if (s
->channel_coded
[ch
]) {
874 int level
, run
, sign
, tindex
;
876 const int16_t *level_table
, *run_table
;
878 /* special VLC tables are used for ms stereo because
879 there is potentially less energy there */
880 tindex
= (ch
== 1 && s
->ms_stereo
);
881 coef_vlc
= &s
->coef_vlc
[tindex
];
882 run_table
= s
->run_table
[tindex
];
883 level_table
= s
->level_table
[tindex
];
885 ptr
= &s
->coefs1
[ch
][0];
886 eptr
= ptr
+ nb_coefs
[ch
];
887 memset(ptr
, 0, s
->block_len
* sizeof(int16_t));
889 code
= get_vlc2(&s
->gb
, coef_vlc
->table
, VLCBITS
, VLCMAX
);
895 } else if (code
== 0) {
897 level
= get_bits(&s
->gb
, coef_nb_bits
);
898 /* NOTE: this is rather suboptimal. reading
899 block_len_bits would be better */
900 run
= get_bits(&s
->gb
, s
->frame_len_bits
);
903 run
= run_table
[code
];
904 level
= level_table
[code
];
906 sign
= get_bits(&s
->gb
, 1);
913 /* NOTE: EOB can be omitted */
918 if (s
->version
== 1 && s
->nb_channels
>= 2) {
919 align_get_bits(&s
->gb
);
925 int n4
= s
->block_len
/ 2;
926 mdct_norm
= 1.0 / (float)n4
;
927 if (s
->version
== 1) {
928 mdct_norm
*= sqrt(n4
);
932 /* finally compute the MDCT coefficients */
933 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
934 if (s
->channel_coded
[ch
]) {
936 float *coefs
, *exponents
, mult
, mult1
, noise
, *exp_ptr
;
937 int i
, j
, n
, n1
, last_high_band
;
938 float exp_power
[HIGH_BAND_MAX_SIZE
];
940 coefs1
= s
->coefs1
[ch
];
941 exponents
= s
->exponents
[ch
];
942 mult
= pow(10, total_gain
* 0.05) / s
->max_exponent
[ch
];
944 coefs
= s
->coefs
[ch
];
945 if (s
->use_noise_coding
) {
947 /* very low freqs : noise */
948 for(i
= 0;i
< s
->coefs_start
; i
++) {
949 *coefs
++ = s
->noise_table
[s
->noise_index
] * (*exponents
++) * mult1
;
950 s
->noise_index
= (s
->noise_index
+ 1) & (NOISE_TAB_SIZE
- 1);
953 n1
= s
->exponent_high_sizes
[bsize
];
955 /* compute power of high bands */
956 exp_ptr
= exponents
+
957 s
->high_band_start
[bsize
] -
959 last_high_band
= 0; /* avoid warning */
961 n
= s
->exponent_high_bands
[s
->frame_len_bits
-
962 s
->block_len_bits
][j
];
963 if (s
->high_band_coded
[ch
][j
]) {
966 for(i
= 0;i
< n
; i
++) {
970 exp_power
[j
] = e2
/ n
;
972 tprintf("%d: power=%f (%d)\n", j
, exp_power
[j
], n
);
977 /* main freqs and high freqs */
980 n
= s
->high_band_start
[bsize
] -
983 n
= s
->exponent_high_bands
[s
->frame_len_bits
-
984 s
->block_len_bits
][j
];
986 if (j
>= 0 && s
->high_band_coded
[ch
][j
]) {
987 /* use noise with specified power */
988 mult1
= sqrt(exp_power
[j
] / exp_power
[last_high_band
]);
989 /* XXX: use a table */
990 mult1
= mult1
* pow(10, s
->high_band_values
[ch
][j
] * 0.05);
991 mult1
= mult1
/ (s
->max_exponent
[ch
] * s
->noise_mult
);
993 for(i
= 0;i
< n
; i
++) {
994 noise
= s
->noise_table
[s
->noise_index
];
995 s
->noise_index
= (s
->noise_index
+ 1) & (NOISE_TAB_SIZE
- 1);
996 *coefs
++ = (*exponents
++) * noise
* mult1
;
999 /* coded values + small noise */
1000 for(i
= 0;i
< n
; i
++) {
1001 noise
= s
->noise_table
[s
->noise_index
];
1002 s
->noise_index
= (s
->noise_index
+ 1) & (NOISE_TAB_SIZE
- 1);
1003 *coefs
++ = ((*coefs1
++) + noise
) * (*exponents
++) * mult
;
1008 /* very high freqs : noise */
1009 n
= s
->block_len
- s
->coefs_end
[bsize
];
1010 mult1
= mult
* exponents
[-1];
1011 for(i
= 0; i
< n
; i
++) {
1012 *coefs
++ = s
->noise_table
[s
->noise_index
] * mult1
;
1013 s
->noise_index
= (s
->noise_index
+ 1) & (NOISE_TAB_SIZE
- 1);
1016 /* XXX: optimize more */
1017 for(i
= 0;i
< s
->coefs_start
; i
++)
1020 for(i
= 0;i
< n
; i
++) {
1021 *coefs
++ = coefs1
[i
] * exponents
[i
] * mult
;
1023 n
= s
->block_len
- s
->coefs_end
[bsize
];
1024 for(i
= 0;i
< n
; i
++)
1031 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
1032 if (s
->channel_coded
[ch
]) {
1033 dump_floats("exponents", 3, s
->exponents
[ch
], s
->block_len
);
1034 dump_floats("coefs", 1, s
->coefs
[ch
], s
->block_len
);
1039 if (s
->ms_stereo
&& s
->channel_coded
[1]) {
1043 /* nominal case for ms stereo: we do it before mdct */
1044 /* no need to optimize this case because it should almost
1046 if (!s
->channel_coded
[0]) {
1047 tprintf("rare ms-stereo case happened\n");
1048 memset(s
->coefs
[0], 0, sizeof(float) * s
->block_len
);
1049 s
->channel_coded
[0] = 1;
1052 for(i
= 0; i
< s
->block_len
; i
++) {
1055 s
->coefs
[0][i
] = a
+ b
;
1056 s
->coefs
[1][i
] = a
- b
;
1060 /* build the window : we ensure that when the windows overlap
1061 their squared sum is always 1 (MDCT reconstruction rule) */
1062 /* XXX: merge with output */
1064 int i
, next_block_len
, block_len
, prev_block_len
, n
;
1067 block_len
= s
->block_len
;
1068 prev_block_len
= 1 << s
->prev_block_len_bits
;
1069 next_block_len
= 1 << s
->next_block_len_bits
;
1072 wptr
= window
+ block_len
;
1073 if (block_len
<= next_block_len
) {
1074 for(i
=0;i
<block_len
;i
++)
1075 *wptr
++ = s
->windows
[bsize
][i
];
1078 n
= (block_len
/ 2) - (next_block_len
/ 2);
1081 for(i
=0;i
<next_block_len
;i
++)
1082 *wptr
++ = s
->windows
[s
->frame_len_bits
- s
->next_block_len_bits
][i
];
1088 wptr
= window
+ block_len
;
1089 if (block_len
<= prev_block_len
) {
1090 for(i
=0;i
<block_len
;i
++)
1091 *--wptr
= s
->windows
[bsize
][i
];
1094 n
= (block_len
/ 2) - (prev_block_len
/ 2);
1097 for(i
=0;i
<prev_block_len
;i
++)
1098 *--wptr
= s
->windows
[s
->frame_len_bits
- s
->prev_block_len_bits
][i
];
1105 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
1106 if (s
->channel_coded
[ch
]) {
1107 DECLARE_ALIGNED_16(FFTSample
, output
[BLOCK_MAX_SIZE
* 2]);
1109 int i
, n4
, index
, n
;
1112 n4
= s
->block_len
/ 2;
1113 ff_imdct_calc(&s
->mdct_ctx
[bsize
],
1114 output
, s
->coefs
[ch
], s
->mdct_tmp
);
1116 /* XXX: optimize all that by build the window and
1117 multipying/adding at the same time */
1118 /* multiply by the window */
1119 for(i
=0;i
<n
* 2;i
++) {
1120 output
[i
] *= window
[i
];
1123 /* add in the frame */
1124 index
= (s
->frame_len
/ 2) + s
->block_pos
- n4
;
1125 ptr
= &s
->frame_out
[ch
][index
];
1126 for(i
=0;i
<n
* 2;i
++) {
1131 /* specific fast case for ms-stereo : add to second
1132 channel if it is not coded */
1133 if (s
->ms_stereo
&& !s
->channel_coded
[1]) {
1134 ptr
= &s
->frame_out
[1][index
];
1135 for(i
=0;i
<n
* 2;i
++) {
1143 /* update block number */
1145 s
->block_pos
+= s
->block_len
;
1146 if (s
->block_pos
>= s
->frame_len
)
1152 /* decode a frame of frame_len samples */
1153 static int wma_decode_frame(WMADecodeContext
*s
, int16_t *samples
)
1155 int ret
, i
, n
, a
, ch
, incr
;
1160 tprintf("***decode_frame: %d size=%d\n", s
->frame_count
++, s
->frame_len
);
1163 /* read each block */
1167 ret
= wma_decode_block(s
);
1174 /* convert frame to integer */
1176 incr
= s
->nb_channels
;
1177 for(ch
= 0; ch
< s
->nb_channels
; ch
++) {
1179 iptr
= s
->frame_out
[ch
];
1182 a
= lrintf(*iptr
++);
1185 else if (a
< -32768)
1190 /* prepare for next block */
1191 memmove(&s
->frame_out
[ch
][0], &s
->frame_out
[ch
][s
->frame_len
],
1192 s
->frame_len
* sizeof(float));
1193 /* XXX: suppress this */
1194 memset(&s
->frame_out
[ch
][s
->frame_len
], 0,
1195 s
->frame_len
* sizeof(float));
1199 dump_shorts("samples", samples
, n
* s
->nb_channels
);
1204 static int wma_decode_superframe(AVCodecContext
*avctx
,
1205 void *data
, int *data_size
,
1206 uint8_t *buf
, int buf_size
)
1208 WMADecodeContext
*s
= avctx
->priv_data
;
1209 int nb_frames
, bit_offset
, i
, pos
, len
;
1213 tprintf("***decode_superframe:\n");
1216 s
->last_superframe_len
= 0;
1222 init_get_bits(&s
->gb
, buf
, buf_size
*8);
1224 if (s
->use_bit_reservoir
) {
1225 /* read super frame header */
1226 get_bits(&s
->gb
, 4); /* super frame index */
1227 nb_frames
= get_bits(&s
->gb
, 4) - 1;
1229 bit_offset
= get_bits(&s
->gb
, s
->byte_offset_bits
+ 3);
1231 if (s
->last_superframe_len
> 0) {
1232 // printf("skip=%d\n", s->last_bitoffset);
1233 /* add bit_offset bits to last frame */
1234 if ((s
->last_superframe_len
+ ((bit_offset
+ 7) >> 3)) >
1235 MAX_CODED_SUPERFRAME_SIZE
)
1237 q
= s
->last_superframe
+ s
->last_superframe_len
;
1240 *q
++ = (get_bits
)(&s
->gb
, 8);
1244 *q
++ = (get_bits
)(&s
->gb
, len
) << (8 - len
);
1247 /* XXX: bit_offset bits into last frame */
1248 init_get_bits(&s
->gb
, s
->last_superframe
, MAX_CODED_SUPERFRAME_SIZE
*8);
1249 /* skip unused bits */
1250 if (s
->last_bitoffset
> 0)
1251 skip_bits(&s
->gb
, s
->last_bitoffset
);
1252 /* this frame is stored in the last superframe and in the
1254 if (wma_decode_frame(s
, samples
) < 0)
1256 samples
+= s
->nb_channels
* s
->frame_len
;
1259 /* read each frame starting from bit_offset */
1260 pos
= bit_offset
+ 4 + 4 + s
->byte_offset_bits
+ 3;
1261 init_get_bits(&s
->gb
, buf
+ (pos
>> 3), (MAX_CODED_SUPERFRAME_SIZE
- (pos
>> 3))*8);
1264 skip_bits(&s
->gb
, len
);
1266 s
->reset_block_lengths
= 1;
1267 for(i
=0;i
<nb_frames
;i
++) {
1268 if (wma_decode_frame(s
, samples
) < 0)
1270 samples
+= s
->nb_channels
* s
->frame_len
;
1273 /* we copy the end of the frame in the last frame buffer */
1274 pos
= get_bits_count(&s
->gb
) + ((bit_offset
+ 4 + 4 + s
->byte_offset_bits
+ 3) & ~7);
1275 s
->last_bitoffset
= pos
& 7;
1277 len
= buf_size
- pos
;
1278 if (len
> MAX_CODED_SUPERFRAME_SIZE
|| len
< 0) {
1281 s
->last_superframe_len
= len
;
1282 memcpy(s
->last_superframe
, buf
+ pos
, len
);
1284 /* single frame decode */
1285 if (wma_decode_frame(s
, samples
) < 0)
1287 samples
+= s
->nb_channels
* s
->frame_len
;
1289 *data_size
= (int8_t *)samples
- (int8_t *)data
;
1290 return s
->block_align
;
1292 /* when error, we reset the bit reservoir */
1293 s
->last_superframe_len
= 0;
1297 static int wma_decode_end(AVCodecContext
*avctx
)
1299 WMADecodeContext
*s
= avctx
->priv_data
;
1302 for(i
= 0; i
< s
->nb_block_sizes
; i
++)
1303 ff_mdct_end(&s
->mdct_ctx
[i
]);
1304 for(i
= 0; i
< s
->nb_block_sizes
; i
++)
1305 av_free(s
->windows
[i
]);
1307 if (s
->use_exp_vlc
) {
1308 free_vlc(&s
->exp_vlc
);
1310 if (s
->use_noise_coding
) {
1311 free_vlc(&s
->hgain_vlc
);
1313 for(i
= 0;i
< 2; i
++) {
1314 free_vlc(&s
->coef_vlc
[i
]);
1315 av_free(s
->run_table
[i
]);
1316 av_free(s
->level_table
[i
]);
1322 AVCodec wmav1_decoder
=
1327 sizeof(WMADecodeContext
),
1331 wma_decode_superframe
,
1334 AVCodec wmav2_decoder
=
1339 sizeof(WMADecodeContext
),
1343 wma_decode_superframe
,