ecc7e41a5194ebe5d86efcac586fed4511593bd9
3 * Copyright (c) 2002-2007 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
22 #include "libavutil/attributes.h"
27 #include "wma_common.h"
28 #include "wma_freqs.h"
34 /* XXX: use same run/length optimization as mpeg decoders */
35 // FIXME maybe split decode / encode or pass flag
36 static av_cold
void init_coef_vlc(VLC
*vlc
, uint16_t **prun_table
,
37 float **plevel_table
, uint16_t **pint_table
,
38 const CoefVLCTable
*vlc_table
)
41 const uint8_t *table_bits
= vlc_table
->huffbits
;
42 const uint32_t *table_codes
= vlc_table
->huffcodes
;
43 const uint16_t *levels_table
= vlc_table
->levels
;
44 uint16_t *run_table
, *level_table
, *int_table
;
46 int i
, l
, j
, k
, level
;
48 init_vlc(vlc
, VLCBITS
, n
, table_bits
, 1, 1, table_codes
, 4, 4, 0);
50 run_table
= av_malloc_array(n
, sizeof(uint16_t));
51 level_table
= av_malloc_array(n
, sizeof(uint16_t));
52 flevel_table
= av_malloc_array(n
, sizeof(*flevel_table
));
53 int_table
= av_malloc_array(n
, sizeof(uint16_t));
59 l
= levels_table
[k
++];
60 for (j
= 0; j
< l
; j
++) {
62 level_table
[i
] = level
;
63 flevel_table
[i
] = level
;
68 *prun_table
= run_table
;
69 *plevel_table
= flevel_table
;
70 *pint_table
= int_table
;
74 av_cold
int ff_wma_init(AVCodecContext
*avctx
, int flags2
)
76 WMACodecContext
*s
= avctx
->priv_data
;
78 float bps1
, high_freq
;
83 if (avctx
->sample_rate
<= 0 || avctx
->sample_rate
> 50000 ||
84 avctx
->channels
<= 0 || avctx
->channels
> 2 ||
88 ff_fmt_convert_init(&s
->fmt_conv
, avctx
);
89 avpriv_float_dsp_init(&s
->fdsp
, avctx
->flags
& CODEC_FLAG_BITEXACT
);
91 if (avctx
->codec
->id
== AV_CODEC_ID_WMAV1
)
96 /* compute MDCT block size */
97 s
->frame_len_bits
= ff_wma_get_frame_len_bits(avctx
->sample_rate
,
99 s
->next_block_len_bits
= s
->frame_len_bits
;
100 s
->prev_block_len_bits
= s
->frame_len_bits
;
101 s
->block_len_bits
= s
->frame_len_bits
;
103 s
->frame_len
= 1 << s
->frame_len_bits
;
104 if (s
->use_variable_block_len
) {
106 nb
= ((flags2
>> 3) & 3) + 1;
107 if ((avctx
->bit_rate
/ avctx
->channels
) >= 32000)
109 nb_max
= s
->frame_len_bits
- BLOCK_MIN_BITS
;
112 s
->nb_block_sizes
= nb
+ 1;
114 s
->nb_block_sizes
= 1;
116 /* init rate dependent parameters */
117 s
->use_noise_coding
= 1;
118 high_freq
= avctx
->sample_rate
* 0.5;
120 /* if version 2, then the rates are normalized */
121 sample_rate1
= avctx
->sample_rate
;
122 if (s
->version
== 2) {
123 if (sample_rate1
>= 44100)
124 sample_rate1
= 44100;
125 else if (sample_rate1
>= 22050)
126 sample_rate1
= 22050;
127 else if (sample_rate1
>= 16000)
128 sample_rate1
= 16000;
129 else if (sample_rate1
>= 11025)
130 sample_rate1
= 11025;
131 else if (sample_rate1
>= 8000)
135 bps
= (float) avctx
->bit_rate
/
136 (float) (avctx
->channels
* avctx
->sample_rate
);
137 s
->byte_offset_bits
= av_log2((int) (bps
* s
->frame_len
/ 8.0 + 0.5)) + 2;
138 if (s
->byte_offset_bits
+ 3 > MIN_CACHE_BITS
) {
139 av_log(avctx
, AV_LOG_ERROR
, "byte_offset_bits %d is too large\n", s
->byte_offset_bits
);
140 return AVERROR_PATCHWELCOME
;
143 /* compute high frequency value and choose if noise coding should
146 if (avctx
->channels
== 2)
148 if (sample_rate1
== 44100) {
150 s
->use_noise_coding
= 0;
152 high_freq
= high_freq
* 0.4;
153 } else if (sample_rate1
== 22050) {
155 s
->use_noise_coding
= 0;
156 else if (bps1
>= 0.72)
157 high_freq
= high_freq
* 0.7;
159 high_freq
= high_freq
* 0.6;
160 } else if (sample_rate1
== 16000) {
162 high_freq
= high_freq
* 0.5;
164 high_freq
= high_freq
* 0.3;
165 } else if (sample_rate1
== 11025)
166 high_freq
= high_freq
* 0.7;
167 else if (sample_rate1
== 8000) {
169 high_freq
= high_freq
* 0.5;
171 s
->use_noise_coding
= 0;
173 high_freq
= high_freq
* 0.65;
176 high_freq
= high_freq
* 0.75;
178 high_freq
= high_freq
* 0.6;
180 high_freq
= high_freq
* 0.5;
182 av_dlog(s
->avctx
, "flags2=0x%x\n", flags2
);
183 av_dlog(s
->avctx
, "version=%d channels=%d sample_rate=%d bitrate=%d block_align=%d\n",
184 s
->version
, avctx
->channels
, avctx
->sample_rate
, avctx
->bit_rate
,
186 av_dlog(s
->avctx
, "bps=%f bps1=%f high_freq=%f bitoffset=%d\n",
187 bps
, bps1
, high_freq
, s
->byte_offset_bits
);
188 av_dlog(s
->avctx
, "use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
189 s
->use_noise_coding
, s
->use_exp_vlc
, s
->nb_block_sizes
);
191 /* compute the scale factor band sizes for each MDCT block size */
193 int a
, b
, pos
, lpos
, k
, block_len
, i
, j
, n
;
194 const uint8_t *table
;
200 for (k
= 0; k
< s
->nb_block_sizes
; k
++) {
201 block_len
= s
->frame_len
>> k
;
203 if (s
->version
== 1) {
205 for (i
= 0; i
< 25; i
++) {
206 a
= ff_wma_critical_freqs
[i
];
207 b
= avctx
->sample_rate
;
208 pos
= ((block_len
* 2 * a
) + (b
>> 1)) / b
;
211 s
->exponent_bands
[0][i
] = pos
- lpos
;
212 if (pos
>= block_len
) {
218 s
->exponent_sizes
[0] = i
;
220 /* hardcoded tables */
222 a
= s
->frame_len_bits
- BLOCK_MIN_BITS
- k
;
224 if (avctx
->sample_rate
>= 44100)
225 table
= exponent_band_44100
[a
];
226 else if (avctx
->sample_rate
>= 32000)
227 table
= exponent_band_32000
[a
];
228 else if (avctx
->sample_rate
>= 22050)
229 table
= exponent_band_22050
[a
];
233 for (i
= 0; i
< n
; i
++)
234 s
->exponent_bands
[k
][i
] = table
[i
];
235 s
->exponent_sizes
[k
] = n
;
239 for (i
= 0; i
< 25; i
++) {
240 a
= ff_wma_critical_freqs
[i
];
241 b
= avctx
->sample_rate
;
242 pos
= ((block_len
* 2 * a
) + (b
<< 1)) / (4 * b
);
247 s
->exponent_bands
[k
][j
++] = pos
- lpos
;
248 if (pos
>= block_len
)
252 s
->exponent_sizes
[k
] = j
;
256 /* max number of coefs */
257 s
->coefs_end
[k
] = (s
->frame_len
- ((s
->frame_len
* 9) / 100)) >> k
;
258 /* high freq computation */
259 s
->high_band_start
[k
] = (int) ((block_len
* 2 * high_freq
) /
260 avctx
->sample_rate
+ 0.5);
261 n
= s
->exponent_sizes
[k
];
264 for (i
= 0; i
< n
; i
++) {
267 pos
+= s
->exponent_bands
[k
][i
];
269 if (start
< s
->high_band_start
[k
])
270 start
= s
->high_band_start
[k
];
271 if (end
> s
->coefs_end
[k
])
272 end
= s
->coefs_end
[k
];
274 s
->exponent_high_bands
[k
][j
++] = end
- start
;
276 s
->exponent_high_sizes
[k
] = j
;
278 tprintf(s
->avctx
, "%5d: coefs_end=%d high_band_start=%d nb_high_bands=%d: ",
281 s
->high_band_start
[k
],
282 s
->exponent_high_sizes
[k
]);
283 for (j
= 0; j
< s
->exponent_high_sizes
[k
]; j
++)
284 tprintf(s
->avctx
, " %d", s
->exponent_high_bands
[k
][j
]);
285 tprintf(s
->avctx
, "\n");
293 for (i
= 0; i
< s
->nb_block_sizes
; i
++) {
294 tprintf(s
->avctx
, "%5d: n=%2d:",
296 s
->exponent_sizes
[i
]);
297 for (j
= 0; j
< s
->exponent_sizes
[i
]; j
++)
298 tprintf(s
->avctx
, " %d", s
->exponent_bands
[i
][j
]);
299 tprintf(s
->avctx
, "\n");
304 /* init MDCT windows : simple sine window */
305 for (i
= 0; i
< s
->nb_block_sizes
; i
++) {
306 ff_init_ff_sine_windows(s
->frame_len_bits
- i
);
307 s
->windows
[i
] = ff_sine_windows
[s
->frame_len_bits
- i
];
310 s
->reset_block_lengths
= 1;
312 if (s
->use_noise_coding
) {
313 /* init the noise generator */
315 s
->noise_mult
= 0.02;
317 s
->noise_mult
= 0.04;
320 for (i
= 0; i
< NOISE_TAB_SIZE
; i
++)
321 s
->noise_table
[i
] = 1.0 * s
->noise_mult
;
327 norm
= (1.0 / (float) (1LL << 31)) * sqrt(3) * s
->noise_mult
;
328 for (i
= 0; i
< NOISE_TAB_SIZE
; i
++) {
329 seed
= seed
* 314159 + 1;
330 s
->noise_table
[i
] = (float) ((int) seed
) * norm
;
336 /* choose the VLC tables for the coefficients */
338 if (avctx
->sample_rate
>= 32000) {
341 else if (bps1
< 1.16)
344 s
->coef_vlcs
[0] = &coef_vlcs
[coef_vlc_table
* 2];
345 s
->coef_vlcs
[1] = &coef_vlcs
[coef_vlc_table
* 2 + 1];
346 init_coef_vlc(&s
->coef_vlc
[0], &s
->run_table
[0], &s
->level_table
[0],
347 &s
->int_table
[0], s
->coef_vlcs
[0]);
348 init_coef_vlc(&s
->coef_vlc
[1], &s
->run_table
[1], &s
->level_table
[1],
349 &s
->int_table
[1], s
->coef_vlcs
[1]);
354 int ff_wma_total_gain_to_bits(int total_gain
)
358 else if (total_gain
< 32)
360 else if (total_gain
< 40)
362 else if (total_gain
< 45)
368 int ff_wma_end(AVCodecContext
*avctx
)
370 WMACodecContext
*s
= avctx
->priv_data
;
373 for (i
= 0; i
< s
->nb_block_sizes
; i
++)
374 ff_mdct_end(&s
->mdct_ctx
[i
]);
377 ff_free_vlc(&s
->exp_vlc
);
378 if (s
->use_noise_coding
)
379 ff_free_vlc(&s
->hgain_vlc
);
380 for (i
= 0; i
< 2; i
++) {
381 ff_free_vlc(&s
->coef_vlc
[i
]);
382 av_freep(&s
->run_table
[i
]);
383 av_freep(&s
->level_table
[i
]);
384 av_freep(&s
->int_table
[i
]);
391 * Decode an uncompressed coefficient.
392 * @param gb GetBitContext
393 * @return the decoded coefficient
395 unsigned int ff_wma_get_large_val(GetBitContext
*gb
)
397 /** consumes up to 34 bits */
408 return get_bits_long(gb
, n_bits
);
412 * Decode run level compressed coefficients.
413 * @param avctx codec context
414 * @param gb bitstream reader context
415 * @param vlc vlc table for get_vlc2
416 * @param level_table level codes
417 * @param run_table run codes
418 * @param version 0 for wma1,2 1 for wmapro
419 * @param ptr output buffer
420 * @param offset offset in the output buffer
421 * @param num_coefs number of input coefficents
422 * @param block_len input buffer length (2^n)
423 * @param frame_len_bits number of bits for escaped run codes
424 * @param coef_nb_bits number of bits for escaped level codes
425 * @return 0 on success, -1 otherwise
427 int ff_wma_run_level_decode(AVCodecContext
*avctx
, GetBitContext
*gb
,
428 VLC
*vlc
, const float *level_table
,
429 const uint16_t *run_table
, int version
,
430 WMACoef
*ptr
, int offset
, int num_coefs
,
431 int block_len
, int frame_len_bits
,
434 int code
, level
, sign
;
435 const uint32_t *ilvl
= (const uint32_t *) level_table
;
436 uint32_t *iptr
= (uint32_t *) ptr
;
437 const unsigned int coef_mask
= block_len
- 1;
438 for (; offset
< num_coefs
; offset
++) {
439 code
= get_vlc2(gb
, vlc
->table
, VLCBITS
, VLCMAX
);
442 offset
+= run_table
[code
];
443 sign
= get_bits1(gb
) - 1;
444 iptr
[offset
& coef_mask
] = ilvl
[code
] ^ sign
<< 31;
445 } else if (code
== 1) {
451 level
= get_bits(gb
, coef_nb_bits
);
452 /** NOTE: this is rather suboptimal. reading
453 * block_len_bits would be better */
454 offset
+= get_bits(gb
, frame_len_bits
);
456 level
= ff_wma_get_large_val(gb
);
461 av_log(avctx
, AV_LOG_ERROR
,
462 "broken escape sequence\n");
465 offset
+= get_bits(gb
, frame_len_bits
) + 4;
467 offset
+= get_bits(gb
, 2) + 1;
470 sign
= get_bits1(gb
) - 1;
471 ptr
[offset
& coef_mask
] = (level
^ sign
) - sign
;
474 /** NOTE: EOB can be omitted */
475 if (offset
> num_coefs
) {
476 av_log(avctx
, AV_LOG_ERROR
, "overflow in spectral RLE, ignoring\n");