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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 "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 
39 #define WV_HYBRID_MODE 0x00000008
40 #define WV_HYBRID_SHAPE 0x00000008
41 #define WV_HYBRID_BITRATE 0x00000200
42 #define WV_HYBRID_BALANCE 0x00000400
43 #define WV_INITIAL_BLOCK 0x00000800
44 #define WV_FINAL_BLOCK 0x00001000
45 
46 #define WV_MONO_DATA (WV_MONO | WV_FALSE_STEREO)
47 
48 #define WV_SINGLE_BLOCK (WV_INITIAL_BLOCK | WV_FINAL_BLOCK)
49 
50 #define WV_FLT_SHIFT_ONES 0x01
51 #define WV_FLT_SHIFT_SAME 0x02
52 #define WV_FLT_SHIFT_SENT 0x04
53 #define WV_FLT_ZERO_SENT 0x08
54 #define WV_FLT_ZERO_SIGN 0x10
55 
56 #define WV_MAX_SAMPLES 150000
57 
59  WP_IDF_MASK = 0x3F,
60  WP_IDF_IGNORE = 0x20,
61  WP_IDF_ODD = 0x40,
62  WP_IDF_LONG = 0x80
63 };
64 
65 enum WP_ID {
81 };
82 
83 typedef struct Decorr {
84  int delta;
85  int value;
86  int weightA;
87  int weightB;
90  int sumA;
91  int sumB;
92 } Decorr;
93 
94 typedef struct WvChannel {
95  int median[3];
98 } WvChannel;
99 
100 // macros for manipulating median values
101 #define GET_MED(n) ((c->median[n] >> 4) + 1)
102 #define DEC_MED(n) c->median[n] -= ((c->median[n] + (128 >> (n)) - 2) / (128 >> (n))) * 2U
103 #define INC_MED(n) c->median[n] += ((c->median[n] + (128 >> (n)) ) / (128 >> (n))) * 5U
104 
105 // macros for applying weight
106 #define UPDATE_WEIGHT_CLIP(weight, delta, samples, in) \
107  if ((samples) && (in)) { \
108  if (((samples) ^ (in)) < 0) { \
109  (weight) -= (delta); \
110  if ((weight) < -1024) \
111  (weight) = -1024; \
112  } else { \
113  (weight) += (delta); \
114  if ((weight) > 1024) \
115  (weight) = 1024; \
116  } \
117  }
118 
119 static const int wv_rates[16] = {
120  6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
121  32000, 44100, 48000, 64000, 88200, 96000, 192000, 0
122 };
123 
124 // exponent table copied from WavPack source
125 static const uint8_t wp_exp2_table[256] = {
126  0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0b,
127  0x0b, 0x0c, 0x0d, 0x0e, 0x0e, 0x0f, 0x10, 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x15, 0x16, 0x16,
128  0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21, 0x22, 0x23,
129  0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
130  0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3a, 0x3b, 0x3c, 0x3d,
131  0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b,
132  0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,
133  0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
134  0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
135  0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a,
136  0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,
137  0x9c, 0x9d, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad,
138  0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0,
139  0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc8, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf, 0xd0, 0xd2, 0xd3, 0xd4,
140  0xd6, 0xd7, 0xd8, 0xd9, 0xdb, 0xdc, 0xdd, 0xde, 0xe0, 0xe1, 0xe2, 0xe4, 0xe5, 0xe6, 0xe8, 0xe9,
141  0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff
142 };
143 
144 static const uint8_t wp_log2_table [] = {
145  0x00, 0x01, 0x03, 0x04, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x10, 0x11, 0x12, 0x14, 0x15,
146  0x16, 0x18, 0x19, 0x1a, 0x1c, 0x1d, 0x1e, 0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x28, 0x29, 0x2a,
147  0x2c, 0x2d, 0x2e, 0x2f, 0x31, 0x32, 0x33, 0x34, 0x36, 0x37, 0x38, 0x39, 0x3b, 0x3c, 0x3d, 0x3e,
148  0x3f, 0x41, 0x42, 0x43, 0x44, 0x45, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4d, 0x4e, 0x4f, 0x50, 0x51,
149  0x52, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63,
150  0x64, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x74, 0x75,
151  0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85,
152  0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95,
153  0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4,
154  0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb2,
155  0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0,
156  0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcb, 0xcc, 0xcd, 0xce,
157  0xcf, 0xd0, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd8, 0xd9, 0xda, 0xdb,
158  0xdc, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe4, 0xe5, 0xe6, 0xe7, 0xe7,
159  0xe8, 0xe9, 0xea, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xee, 0xef, 0xf0, 0xf1, 0xf1, 0xf2, 0xf3, 0xf4,
160  0xf4, 0xf5, 0xf6, 0xf7, 0xf7, 0xf8, 0xf9, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xff, 0xff
161 };
162 
163 static av_always_inline int wp_exp2(int16_t val)
164 {
165  int res, neg = 0;
166 
167  if (val < 0) {
168  val = -val;
169  neg = 1;
170  }
171 
172  res = wp_exp2_table[val & 0xFF] | 0x100;
173  val >>= 8;
174  if (val > 31U)
175  return INT_MIN;
176  res = (val > 9) ? (res << (val - 9)) : (res >> (9 - val));
177  return neg ? -res : res;
178 }
179 
181 {
182  int bits;
183 
184  if (!val)
185  return 0;
186  if (val == 1)
187  return 256;
188  val += val >> 9;
189  bits = av_log2(val) + 1;
190  if (bits < 9)
191  return (bits << 8) + wp_log2_table[(val << (9 - bits)) & 0xFF];
192  else
193  return (bits << 8) + wp_log2_table[(val >> (bits - 9)) & 0xFF];
194 }
195 
196 #endif /* AVCODEC_WAVPACK_H */
#define MAX_TERM
Definition: wavpack.h:28
int delta
Definition: wavpack.h:84
const char const char void * val
Definition: avisynth_c.h:771
int median[3]
Definition: wavpack.h:95
int slow_level
Definition: wavpack.h:96
int samplesA[MAX_TERM]
Definition: wavpack.h:88
int av_log2(unsigned v)
Definition: intmath.c:26
static const uint8_t wp_exp2_table[256]
Definition: wavpack.h:125
int weightB
Definition: wavpack.h:87
uint8_t bits
Definition: crc.c:296
uint8_t
int value
Definition: wavpack.h:85
#define U(x)
Definition: vp56_arith.h:37
static av_always_inline int wp_exp2(int16_t val)
Definition: wavpack.h:163
int weightA
Definition: wavpack.h:86
static const int wv_rates[16]
Definition: wavpack.h:119
int32_t
WP_ID
Definition: wavpack.h:65
int error_limit
Definition: wavpack.h:96
int bitrate_acc
Definition: wavpack.h:97
int samplesB[MAX_TERM]
Definition: wavpack.h:89
int sumA
Definition: wavpack.h:90
WP_ID_Flags
Definition: wavpack.h:58
int sumB
Definition: wavpack.h:91
common internal and external API header
static av_always_inline int wp_log2(int32_t val)
Definition: wavpack.h:180
static const uint8_t wp_log2_table[]
Definition: wavpack.h:144
Definition: wavpack.h:83
#define av_always_inline
Definition: attributes.h:39
int bitrate_delta
Definition: wavpack.h:97