FFmpeg
wavpack.h
Go to the documentation of this file.
1 /*
2  * WavPack decoder/encoder common code
3  * Copyright (c) 2006,2011 Konstantin Shishkov
4  *
5  * This file is part of FFmpeg.
6  *
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.
11  *
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.
16  *
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
20  */
21 
22 #ifndef AVCODEC_WAVPACK_H
23 #define AVCODEC_WAVPACK_H
24 
25 #include "libavutil/common.h"
26 
27 #define MAX_TERMS 16
28 #define MAX_TERM 8
29 
30 #define WV_HEADER_SIZE 32
31 
32 #define WV_MONO 0x00000004
33 #define WV_JOINT_STEREO 0x00000010
34 #define WV_CROSS_DECORR 0x00000020
35 #define WV_FLOAT_DATA 0x00000080
36 #define WV_INT32_DATA 0x00000100
37 #define WV_FALSE_STEREO 0x40000000
38 #define WV_DSD_DATA 0x80000000
39 
40 #define WV_HYBRID_MODE 0x00000008
41 #define WV_HYBRID_SHAPE 0x00000008
42 #define WV_HYBRID_BITRATE 0x00000200
43 #define WV_HYBRID_BALANCE 0x00000400
44 #define WV_INITIAL_BLOCK 0x00000800
45 #define WV_FINAL_BLOCK 0x00001000
46 
47 #define WV_MONO_DATA (WV_MONO | WV_FALSE_STEREO)
48 
49 #define WV_SINGLE_BLOCK (WV_INITIAL_BLOCK | WV_FINAL_BLOCK)
50 
51 #define WV_FLT_SHIFT_ONES 0x01
52 #define WV_FLT_SHIFT_SAME 0x02
53 #define WV_FLT_SHIFT_SENT 0x04
54 #define WV_FLT_ZERO_SENT 0x08
55 #define WV_FLT_ZERO_SIGN 0x10
56 
57 #define WV_MAX_SAMPLES 150000
58 
60  WP_IDF_MASK = 0x3F,
61  WP_IDF_IGNORE = 0x20,
62  WP_IDF_ODD = 0x40,
63  WP_IDF_LONG = 0x80
64 };
65 
66 enum WP_ID {
83 };
84 
85 typedef struct Decorr {
86  int delta;
87  int value;
88  int weightA;
89  int weightB;
92  int sumA;
93  int sumB;
94 } Decorr;
95 
96 typedef struct WvChannel {
97  int median[3];
100 } WvChannel;
101 
102 // macros for manipulating median values
103 #define GET_MED(n) ((c->median[n] >> 4) + 1)
104 #define DEC_MED(n) c->median[n] -= ((int)(c->median[n] + (128U >> (n)) - 2) / (128 >> (n))) * 2U
105 #define INC_MED(n) c->median[n] += ((int)(c->median[n] + (128U >> (n)) ) / (128 >> (n))) * 5U
106 
107 // macros for applying weight
108 #define UPDATE_WEIGHT_CLIP(weight, delta, samples, in) \
109  if ((samples) && (in)) { \
110  if (((samples) ^ (in)) < 0) { \
111  (weight) -= (delta); \
112  if ((weight) < -1024) \
113  (weight) = -1024; \
114  } else { \
115  (weight) += (delta); \
116  if ((weight) > 1024) \
117  (weight) = 1024; \
118  } \
119  }
120 
121 static const int wv_rates[16] = {
122  6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
123  32000, 44100, 48000, 64000, 88200, 96000, 192000, 0
124 };
125 
126 // exponent table copied from WavPack source
127 extern const uint8_t ff_wp_exp2_table[256];
128 extern const uint8_t ff_wp_log2_table[256];
129 
130 static av_always_inline int wp_exp2(int16_t val)
131 {
132  int res, neg = 0;
133 
134  if (val < 0) {
135  val = -val;
136  neg = 1;
137  }
138 
139  res = ff_wp_exp2_table[val & 0xFF] | 0x100;
140  val >>= 8;
141  if (val > 31U)
142  return INT_MIN;
143  res = (val > 9) ? (res << (val - 9)) : (res >> (9 - val));
144  return neg ? -res : res;
145 }
146 
147 static av_always_inline int wp_log2(uint32_t val)
148 {
149  int bits;
150 
151  if (!val)
152  return 0;
153  if (val == 1)
154  return 256;
155  val += val >> 9;
156  bits = av_log2(val) + 1;
157  if (bits < 9)
158  return (bits << 8) + ff_wp_log2_table[(val << (9 - bits)) & 0xFF];
159  else
160  return (bits << 8) + ff_wp_log2_table[(val >> (bits - 9)) & 0xFF];
161 }
162 
163 #endif /* AVCODEC_WAVPACK_H */
WP_ID_SHAPING
@ WP_ID_SHAPING
Definition: wavpack.h:74
WvChannel::bitrate_delta
unsigned bitrate_delta
Definition: wavpack.h:99
WP_ID_DSD_DATA
@ WP_ID_DSD_DATA
Definition: wavpack.h:81
WP_ID_HYBRID
@ WP_ID_HYBRID
Definition: wavpack.h:73
WP_ID_FLOATINFO
@ WP_ID_FLOATINFO
Definition: wavpack.h:75
WvChannel::median
int median[3]
Definition: wavpack.h:97
WP_ID_DECWEIGHTS
@ WP_ID_DECWEIGHTS
Definition: wavpack.h:70
WP_IDF_LONG
@ WP_IDF_LONG
Definition: wavpack.h:63
MAX_TERM
#define MAX_TERM
Definition: wavpack.h:28
WvChannel
Definition: wavpack.h:96
Decorr::weightA
int weightA
Definition: wavpack.h:88
Decorr::sumA
int sumA
Definition: wavpack.h:92
WP_ID_DUMMY
@ WP_ID_DUMMY
Definition: wavpack.h:67
WP_ID_DATA
@ WP_ID_DATA
Definition: wavpack.h:77
Decorr
Definition: wavpack.h:85
WP_ID_SAMPLE_RATE
@ WP_ID_SAMPLE_RATE
Definition: wavpack.h:82
U
#define U(x)
Definition: vp56_arith.h:37
WP_ID_ENTROPY
@ WP_ID_ENTROPY
Definition: wavpack.h:72
val
static double val(void *priv, double ch)
Definition: aeval.c:75
WvChannel::bitrate_acc
unsigned bitrate_acc
Definition: wavpack.h:99
wp_log2
static av_always_inline int wp_log2(uint32_t val)
Definition: wavpack.h:147
Decorr::delta
int delta
Definition: wavpack.h:86
WP_ID_EXTRABITS
@ WP_ID_EXTRABITS
Definition: wavpack.h:79
wv_rates
static const int wv_rates[16]
Definition: wavpack.h:121
bits
uint8_t bits
Definition: vp3data.h:141
wp_exp2
static av_always_inline int wp_exp2(int16_t val)
Definition: wavpack.h:130
Decorr::value
int value
Definition: wavpack.h:87
WP_ID_CORR
@ WP_ID_CORR
Definition: wavpack.h:78
WP_IDF_IGNORE
@ WP_IDF_IGNORE
Definition: wavpack.h:61
WvChannel::error_limit
int error_limit
Definition: wavpack.h:98
WP_IDF_ODD
@ WP_IDF_ODD
Definition: wavpack.h:62
Decorr::samplesA
int samplesA[MAX_TERM]
Definition: wavpack.h:90
WP_ID
WP_ID
Definition: wavpack.h:66
WP_ID_DECTERMS
@ WP_ID_DECTERMS
Definition: wavpack.h:69
Decorr::sumB
int sumB
Definition: wavpack.h:93
WP_ID_ENCINFO
@ WP_ID_ENCINFO
Definition: wavpack.h:68
ff_wp_exp2_table
const uint8_t ff_wp_exp2_table[256]
Definition: wavpackdata.c:24
common.h
av_always_inline
#define av_always_inline
Definition: attributes.h:49
WP_ID_CHANINFO
@ WP_ID_CHANINFO
Definition: wavpack.h:80
WP_ID_DECSAMPLES
@ WP_ID_DECSAMPLES
Definition: wavpack.h:71
WP_ID_Flags
WP_ID_Flags
Definition: wavpack.h:59
Decorr::weightB
int weightB
Definition: wavpack.h:89
WvChannel::slow_level
int slow_level
Definition: wavpack.h:98
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:76
av_log2
int av_log2(unsigned v)
Definition: intmath.c:26
Decorr::samplesB
int samplesB[MAX_TERM]
Definition: wavpack.h:91
WP_IDF_MASK
@ WP_IDF_MASK
Definition: wavpack.h:60