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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 | ||
58 | enum WP_ID_Flags { | |
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 { | |
66 | WP_ID_DUMMY = 0, | |
67 | WP_ID_ENCINFO, | |
68 | WP_ID_DECTERMS, | |
69 | WP_ID_DECWEIGHTS, | |
70 | WP_ID_DECSAMPLES, | |
71 | WP_ID_ENTROPY, | |
72 | WP_ID_HYBRID, | |
73 | WP_ID_SHAPING, | |
74 | WP_ID_FLOATINFO, | |
75 | WP_ID_INT32INFO, | |
76 | WP_ID_DATA, | |
77 | WP_ID_CORR, | |
78 | WP_ID_EXTRABITS, | |
79 | WP_ID_CHANINFO, | |
80 | WP_ID_SAMPLE_RATE = 0x27, | |
81 | }; | |
82 | ||
83 | typedef struct Decorr { | |
84 | int delta; | |
85 | int value; | |
86 | int weightA; | |
87 | int weightB; | |
88 | int samplesA[MAX_TERM]; | |
89 | int samplesB[MAX_TERM]; | |
90 | int sumA; | |
91 | int sumB; | |
92 | } Decorr; | |
93 | ||
94 | typedef struct WvChannel { | |
95 | int median[3]; | |
96 | int slow_level, error_limit; | |
97 | int bitrate_acc, bitrate_delta; | |
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))) * 2 | |
103 | #define INC_MED(n) c->median[n] += ((c->median[n] + (128 >> (n)) ) / (128 >> (n))) * 5 | |
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 | res = (val > 9) ? (res << (val - 9)) : (res >> (9 - val)); | |
175 | return neg ? -res : res; | |
176 | } | |
177 | ||
178 | static av_always_inline int wp_log2(int32_t val) | |
179 | { | |
180 | int bits; | |
181 | ||
182 | if (!val) | |
183 | return 0; | |
184 | if (val == 1) | |
185 | return 256; | |
186 | val += val >> 9; | |
187 | bits = av_log2(val) + 1; | |
188 | if (bits < 9) | |
189 | return (bits << 8) + wp_log2_table[(val << (9 - bits)) & 0xFF]; | |
190 | else | |
191 | return (bits << 8) + wp_log2_table[(val >> (bits - 9)) & 0xFF]; | |
192 | } | |
193 | ||
194 | #endif /* AVCODEC_WAVPACK_H */ |