FFmpeg
libavcodec
wavpack.h
Go to the documentation of this file.
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/*
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* WavPack decoder/encoder common code
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* Copyright (c) 2006,2011 Konstantin Shishkov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_WAVPACK_H
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#define AVCODEC_WAVPACK_H
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#include <
limits.h
>
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#include <stdint.h>
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#include "
libavutil/attributes.h
"
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#include "
libavutil/intmath.h
"
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#define MAX_TERMS 16
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#define MAX_TERM 8
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#define WV_HEADER_SIZE 32
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#define WV_MONO 0x00000004
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#define WV_JOINT_STEREO 0x00000010
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#define WV_CROSS_DECORR 0x00000020
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#define WV_FLOAT_DATA 0x00000080
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#define WV_INT32_DATA 0x00000100
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#define WV_FALSE_STEREO 0x40000000
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#define WV_DSD_DATA 0x80000000
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#define WV_HYBRID_MODE 0x00000008
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#define WV_HYBRID_SHAPE 0x00000008
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#define WV_HYBRID_BITRATE 0x00000200
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#define WV_HYBRID_BALANCE 0x00000400
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#define WV_INITIAL_BLOCK 0x00000800
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#define WV_FINAL_BLOCK 0x00001000
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#define WV_MONO_DATA (WV_MONO | WV_FALSE_STEREO)
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#define WV_SINGLE_BLOCK (WV_INITIAL_BLOCK | WV_FINAL_BLOCK)
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#define WV_FLT_SHIFT_ONES 0x01
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#define WV_FLT_SHIFT_SAME 0x02
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#define WV_FLT_SHIFT_SENT 0x04
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#define WV_FLT_ZERO_SENT 0x08
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#define WV_FLT_ZERO_SIGN 0x10
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#define WV_MAX_CHANNELS (1 << 12)
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#define WV_MAX_SAMPLES 150000
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enum
WP_ID_Flags
{
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WP_IDF_MASK
= 0x3F,
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WP_IDF_IGNORE
= 0x20,
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WP_IDF_ODD
= 0x40,
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WP_IDF_LONG
= 0x80
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};
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enum
WP_ID
{
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WP_ID_DUMMY
= 0,
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WP_ID_ENCINFO
,
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WP_ID_DECTERMS
,
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WP_ID_DECWEIGHTS
,
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WP_ID_DECSAMPLES
,
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WP_ID_ENTROPY
,
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WP_ID_HYBRID
,
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WP_ID_SHAPING
,
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WP_ID_FLOATINFO
,
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WP_ID_INT32INFO
,
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WP_ID_DATA
,
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WP_ID_CORR
,
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WP_ID_EXTRABITS
,
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WP_ID_CHANINFO
,
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WP_ID_DSD_DATA
,
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WP_ID_SAMPLE_RATE
= 0x27,
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};
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typedef
struct
Decorr
{
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int
delta
;
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int
value
;
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int
weightA
;
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int
weightB
;
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int
samplesA
[
MAX_TERM
];
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int
samplesB
[
MAX_TERM
];
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int
sumA
;
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int
sumB
;
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}
Decorr
;
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typedef
struct
WvChannel
{
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int
median
[3];
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int
slow_level
,
error_limit
;
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unsigned
bitrate_acc
,
bitrate_delta
;
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}
WvChannel
;
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// macros for manipulating median values
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#define GET_MED(n) ((c->median[n] >> 4) + 1)
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#define DEC_MED(n) c->median[n] -= ((int)(c->median[n] + (128U >> (n)) - 2) / (128 >> (n))) * 2U
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#define INC_MED(n) c->median[n] += ((int)(c->median[n] + (128U >> (n)) ) / (128 >> (n))) * 5U
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// macros for applying weight
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#define UPDATE_WEIGHT_CLIP(weight, delta, samples, in) \
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if ((samples) && (in)) { \
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if (((samples) ^ (in)) < 0) { \
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(weight) -= (delta); \
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if ((weight) < -1024) \
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(weight) = -1024; \
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} else { \
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(weight) += (delta); \
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if ((weight) > 1024) \
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(weight) = 1024; \
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} \
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}
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static
const
int
wv_rates
[16] = {
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6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
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32000, 44100, 48000, 64000, 88200, 96000, 192000, 0
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};
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// exponent table copied from WavPack source
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extern
const
uint8_t
ff_wp_exp2_table
[256];
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extern
const
uint8_t
ff_wp_log2_table
[256];
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static
av_always_inline
int
wp_exp2
(int16_t
val
)
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{
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int
res, neg = 0;
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if
(
val
< 0) {
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val
= -
val
;
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neg = 1;
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}
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res =
ff_wp_exp2_table
[
val
& 0xFF] | 0x100;
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val
>>= 8;
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if
(
val
> 31
U
)
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return
INT_MIN;
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res = (
val
> 9) ? (res << (
val
- 9)) : (res >> (9 -
val
));
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return
neg ? -res : res;
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}
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static
av_always_inline
int
wp_log2
(uint32_t
val
)
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{
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int
bits
;
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if
(!
val
)
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return
0;
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if
(
val
== 1)
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return
256;
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val
+=
val
>> 9;
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bits
=
av_log2
(
val
) + 1;
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if
(
bits
< 9)
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return
(
bits
<< 8) +
ff_wp_log2_table
[(
val
<< (9 -
bits
)) & 0xFF];
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else
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return
(
bits
<< 8) +
ff_wp_log2_table
[(
val
>> (
bits
- 9)) & 0xFF];
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}
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#endif
/* AVCODEC_WAVPACK_H */
WP_ID_SHAPING
@ WP_ID_SHAPING
Definition:
wavpack.h:78
WvChannel::bitrate_delta
unsigned bitrate_delta
Definition:
wavpack.h:103
WP_ID_DSD_DATA
@ WP_ID_DSD_DATA
Definition:
wavpack.h:85
WP_ID_HYBRID
@ WP_ID_HYBRID
Definition:
wavpack.h:77
WP_ID_FLOATINFO
@ WP_ID_FLOATINFO
Definition:
wavpack.h:79
WvChannel::median
int median[3]
Definition:
wavpack.h:101
WP_ID_DECWEIGHTS
@ WP_ID_DECWEIGHTS
Definition:
wavpack.h:74
WP_IDF_LONG
@ WP_IDF_LONG
Definition:
wavpack.h:67
MAX_TERM
#define MAX_TERM
Definition:
wavpack.h:31
WvChannel
Definition:
wavpack.h:100
Decorr::weightA
int weightA
Definition:
wavpack.h:92
Decorr::sumA
int sumA
Definition:
wavpack.h:96
WP_ID_DUMMY
@ WP_ID_DUMMY
Definition:
wavpack.h:71
WP_ID_DATA
@ WP_ID_DATA
Definition:
wavpack.h:81
Decorr
Definition:
wavpack.h:89
WP_ID_SAMPLE_RATE
@ WP_ID_SAMPLE_RATE
Definition:
wavpack.h:86
WP_ID_ENTROPY
@ WP_ID_ENTROPY
Definition:
wavpack.h:76
val
static double val(void *priv, double ch)
Definition:
aeval.c:77
WvChannel::bitrate_acc
unsigned bitrate_acc
Definition:
wavpack.h:103
wp_log2
static av_always_inline int wp_log2(uint32_t val)
Definition:
wavpack.h:151
Decorr::delta
int delta
Definition:
wavpack.h:90
WP_ID_EXTRABITS
@ WP_ID_EXTRABITS
Definition:
wavpack.h:83
wv_rates
static const int wv_rates[16]
Definition:
wavpack.h:125
bits
uint8_t bits
Definition:
vp3data.h:128
wp_exp2
static av_always_inline int wp_exp2(int16_t val)
Definition:
wavpack.h:134
Decorr::value
int value
Definition:
wavpack.h:91
limits.h
WP_ID_CORR
@ WP_ID_CORR
Definition:
wavpack.h:82
WP_IDF_IGNORE
@ WP_IDF_IGNORE
Definition:
wavpack.h:65
WvChannel::error_limit
int error_limit
Definition:
wavpack.h:102
WP_IDF_ODD
@ WP_IDF_ODD
Definition:
wavpack.h:66
Decorr::samplesA
int samplesA[MAX_TERM]
Definition:
wavpack.h:94
WP_ID
WP_ID
Definition:
wavpack.h:70
attributes.h
WP_ID_DECTERMS
@ WP_ID_DECTERMS
Definition:
wavpack.h:73
Decorr::sumB
int sumB
Definition:
wavpack.h:97
WP_ID_ENCINFO
@ WP_ID_ENCINFO
Definition:
wavpack.h:72
ff_wp_exp2_table
const uint8_t ff_wp_exp2_table[256]
Definition:
wavpackdata.c:24
av_always_inline
#define av_always_inline
Definition:
attributes.h:49
WP_ID_CHANINFO
@ WP_ID_CHANINFO
Definition:
wavpack.h:84
WP_ID_DECSAMPLES
@ WP_ID_DECSAMPLES
Definition:
wavpack.h:75
WP_ID_Flags
WP_ID_Flags
Definition:
wavpack.h:63
U
#define U(x)
Definition:
vpx_arith.h:37
Decorr::weightB
int weightB
Definition:
wavpack.h:93
WvChannel::slow_level
int slow_level
Definition:
wavpack.h:102
ff_wp_log2_table
const uint8_t ff_wp_log2_table[256]
Definition:
wavpackdata.c:43
WP_ID_INT32INFO
@ WP_ID_INT32INFO
Definition:
wavpack.h:80
av_log2
int av_log2(unsigned v)
Definition:
intmath.c:26
Decorr::samplesB
int samplesB[MAX_TERM]
Definition:
wavpack.h:95
WP_IDF_MASK
@ WP_IDF_MASK
Definition:
wavpack.h:64
intmath.h
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