FFmpeg
wavpack.h
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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 <limits.h>
26 #include <stdint.h>
27 #include "libavutil/attributes.h"
28 #include "libavutil/intmath.h"
29 
30 #define MAX_TERMS 16
31 #define MAX_TERM 8
32 
33 #define WV_HEADER_SIZE 32
34 
35 #define WV_MONO 0x00000004
36 #define WV_JOINT_STEREO 0x00000010
37 #define WV_CROSS_DECORR 0x00000020
38 #define WV_FLOAT_DATA 0x00000080
39 #define WV_INT32_DATA 0x00000100
40 #define WV_FALSE_STEREO 0x40000000
41 #define WV_DSD_DATA 0x80000000
42 
43 #define WV_HYBRID_MODE 0x00000008
44 #define WV_HYBRID_SHAPE 0x00000008
45 #define WV_HYBRID_BITRATE 0x00000200
46 #define WV_HYBRID_BALANCE 0x00000400
47 #define WV_INITIAL_BLOCK 0x00000800
48 #define WV_FINAL_BLOCK 0x00001000
49 
50 #define WV_MONO_DATA (WV_MONO | WV_FALSE_STEREO)
51 
52 #define WV_SINGLE_BLOCK (WV_INITIAL_BLOCK | WV_FINAL_BLOCK)
53 
54 #define WV_FLT_SHIFT_ONES 0x01
55 #define WV_FLT_SHIFT_SAME 0x02
56 #define WV_FLT_SHIFT_SENT 0x04
57 #define WV_FLT_ZERO_SENT 0x08
58 #define WV_FLT_ZERO_SIGN 0x10
59 
60 #define WV_MAX_SAMPLES 150000
61 
63  WP_IDF_MASK = 0x3F,
64  WP_IDF_IGNORE = 0x20,
65  WP_IDF_ODD = 0x40,
66  WP_IDF_LONG = 0x80
67 };
68 
69 enum WP_ID {
86 };
87 
88 typedef struct Decorr {
89  int delta;
90  int value;
91  int weightA;
92  int weightB;
95  int sumA;
96  int sumB;
97 } Decorr;
98 
99 typedef struct WvChannel {
100  int median[3];
103 } WvChannel;
104 
105 // macros for manipulating median values
106 #define GET_MED(n) ((c->median[n] >> 4) + 1)
107 #define DEC_MED(n) c->median[n] -= ((int)(c->median[n] + (128U >> (n)) - 2) / (128 >> (n))) * 2U
108 #define INC_MED(n) c->median[n] += ((int)(c->median[n] + (128U >> (n)) ) / (128 >> (n))) * 5U
109 
110 // macros for applying weight
111 #define UPDATE_WEIGHT_CLIP(weight, delta, samples, in) \
112  if ((samples) && (in)) { \
113  if (((samples) ^ (in)) < 0) { \
114  (weight) -= (delta); \
115  if ((weight) < -1024) \
116  (weight) = -1024; \
117  } else { \
118  (weight) += (delta); \
119  if ((weight) > 1024) \
120  (weight) = 1024; \
121  } \
122  }
123 
124 static const int wv_rates[16] = {
125  6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
126  32000, 44100, 48000, 64000, 88200, 96000, 192000, 0
127 };
128 
129 // exponent table copied from WavPack source
130 extern const uint8_t ff_wp_exp2_table[256];
131 extern const uint8_t ff_wp_log2_table[256];
132 
133 static av_always_inline int wp_exp2(int16_t val)
134 {
135  int res, neg = 0;
136 
137  if (val < 0) {
138  val = -val;
139  neg = 1;
140  }
141 
142  res = ff_wp_exp2_table[val & 0xFF] | 0x100;
143  val >>= 8;
144  if (val > 31U)
145  return INT_MIN;
146  res = (val > 9) ? (res << (val - 9)) : (res >> (9 - val));
147  return neg ? -res : res;
148 }
149 
150 static av_always_inline int wp_log2(uint32_t val)
151 {
152  int bits;
153 
154  if (!val)
155  return 0;
156  if (val == 1)
157  return 256;
158  val += val >> 9;
159  bits = av_log2(val) + 1;
160  if (bits < 9)
161  return (bits << 8) + ff_wp_log2_table[(val << (9 - bits)) & 0xFF];
162  else
163  return (bits << 8) + ff_wp_log2_table[(val >> (bits - 9)) & 0xFF];
164 }
165 
166 #endif /* AVCODEC_WAVPACK_H */
WP_ID_SHAPING
@ WP_ID_SHAPING
Definition: wavpack.h:77
WvChannel::bitrate_delta
unsigned bitrate_delta
Definition: wavpack.h:102
WP_ID_DSD_DATA
@ WP_ID_DSD_DATA
Definition: wavpack.h:84
WP_ID_HYBRID
@ WP_ID_HYBRID
Definition: wavpack.h:76
WP_ID_FLOATINFO
@ WP_ID_FLOATINFO
Definition: wavpack.h:78
WvChannel::median
int median[3]
Definition: wavpack.h:100
WP_ID_DECWEIGHTS
@ WP_ID_DECWEIGHTS
Definition: wavpack.h:73
WP_IDF_LONG
@ WP_IDF_LONG
Definition: wavpack.h:66
MAX_TERM
#define MAX_TERM
Definition: wavpack.h:31
WvChannel
Definition: wavpack.h:99
Decorr::weightA
int weightA
Definition: wavpack.h:91
Decorr::sumA
int sumA
Definition: wavpack.h:95
WP_ID_DUMMY
@ WP_ID_DUMMY
Definition: wavpack.h:70
WP_ID_DATA
@ WP_ID_DATA
Definition: wavpack.h:80
Decorr
Definition: wavpack.h:88
WP_ID_SAMPLE_RATE
@ WP_ID_SAMPLE_RATE
Definition: wavpack.h:85
WP_ID_ENTROPY
@ WP_ID_ENTROPY
Definition: wavpack.h:75
val
static double val(void *priv, double ch)
Definition: aeval.c:77
WvChannel::bitrate_acc
unsigned bitrate_acc
Definition: wavpack.h:102
wp_log2
static av_always_inline int wp_log2(uint32_t val)
Definition: wavpack.h:150
Decorr::delta
int delta
Definition: wavpack.h:89
WP_ID_EXTRABITS
@ WP_ID_EXTRABITS
Definition: wavpack.h:82
wv_rates
static const int wv_rates[16]
Definition: wavpack.h:124
bits
uint8_t bits
Definition: vp3data.h:141
wp_exp2
static av_always_inline int wp_exp2(int16_t val)
Definition: wavpack.h:133
Decorr::value
int value
Definition: wavpack.h:90
limits.h
WP_ID_CORR
@ WP_ID_CORR
Definition: wavpack.h:81
WP_IDF_IGNORE
@ WP_IDF_IGNORE
Definition: wavpack.h:64
WvChannel::error_limit
int error_limit
Definition: wavpack.h:101
WP_IDF_ODD
@ WP_IDF_ODD
Definition: wavpack.h:65
Decorr::samplesA
int samplesA[MAX_TERM]
Definition: wavpack.h:93
WP_ID
WP_ID
Definition: wavpack.h:69
attributes.h
WP_ID_DECTERMS
@ WP_ID_DECTERMS
Definition: wavpack.h:72
Decorr::sumB
int sumB
Definition: wavpack.h:96
WP_ID_ENCINFO
@ WP_ID_ENCINFO
Definition: wavpack.h:71
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:83
WP_ID_DECSAMPLES
@ WP_ID_DECSAMPLES
Definition: wavpack.h:74
WP_ID_Flags
WP_ID_Flags
Definition: wavpack.h:62
U
#define U(x)
Definition: vpx_arith.h:37
Decorr::weightB
int weightB
Definition: wavpack.h:92
WvChannel::slow_level
int slow_level
Definition: wavpack.h:101
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:79
av_log2
int av_log2(unsigned v)
Definition: intmath.c:26
Decorr::samplesB
int samplesB[MAX_TERM]
Definition: wavpack.h:94
WP_IDF_MASK
@ WP_IDF_MASK
Definition: wavpack.h:63
intmath.h