Directory: | ../../../ffmpeg/ |
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File: | src/libavcodec/mlp.c |
Date: | 2022-07-07 01:21:54 |
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Lines: | 38 | 38 | 100.0% |
Branches: | 11 | 12 | 91.7% |
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1 | /* | ||
2 | * MLP codec common code | ||
3 | * Copyright (c) 2007-2008 Ian Caulfield | ||
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 | #include <stdint.h> | ||
23 | |||
24 | #include "libavutil/channel_layout.h" | ||
25 | #include "libavutil/crc.h" | ||
26 | #include "libavutil/intreadwrite.h" | ||
27 | #include "libavutil/thread.h" | ||
28 | #include "mlp.h" | ||
29 | |||
30 | const uint8_t ff_mlp_huffman_tables[3][18][2] = { | ||
31 | { /* Huffman table 0, -7 - +10 */ | ||
32 | {0x01, 9}, {0x01, 8}, {0x01, 7}, {0x01, 6}, {0x01, 5}, {0x01, 4}, {0x01, 3}, | ||
33 | {0x04, 3}, {0x05, 3}, {0x06, 3}, {0x07, 3}, | ||
34 | {0x03, 3}, {0x05, 4}, {0x09, 5}, {0x11, 6}, {0x21, 7}, {0x41, 8}, {0x81, 9}, | ||
35 | }, { /* Huffman table 1, -7 - +8 */ | ||
36 | {0x01, 9}, {0x01, 8}, {0x01, 7}, {0x01, 6}, {0x01, 5}, {0x01, 4}, {0x01, 3}, | ||
37 | {0x02, 2}, {0x03, 2}, | ||
38 | {0x03, 3}, {0x05, 4}, {0x09, 5}, {0x11, 6}, {0x21, 7}, {0x41, 8}, {0x81, 9}, | ||
39 | }, { /* Huffman table 2, -7 - +7 */ | ||
40 | {0x01, 9}, {0x01, 8}, {0x01, 7}, {0x01, 6}, {0x01, 5}, {0x01, 4}, {0x01, 3}, | ||
41 | {0x01, 1}, | ||
42 | {0x03, 3}, {0x05, 4}, {0x09, 5}, {0x11, 6}, {0x21, 7}, {0x41, 8}, {0x81, 9}, | ||
43 | } | ||
44 | }; | ||
45 | |||
46 | const ChannelInformation ff_mlp_ch_info[21] = { | ||
47 | { 0x01, 0x01, 0x00, 0x1f }, { 0x03, 0x02, 0x00, 0x1b }, | ||
48 | { 0x07, 0x02, 0x01, 0x1f }, { 0x0F, 0x02, 0x02, 0x19 }, | ||
49 | { 0x07, 0x02, 0x01, 0x03 }, { 0x0F, 0x02, 0x02, 0x1f }, | ||
50 | { 0x1F, 0x02, 0x03, 0x01 }, { 0x07, 0x02, 0x01, 0x1a }, | ||
51 | { 0x0F, 0x02, 0x02, 0x1f }, { 0x1F, 0x02, 0x03, 0x18 }, | ||
52 | { 0x0F, 0x02, 0x02, 0x02 }, { 0x1F, 0x02, 0x03, 0x1f }, | ||
53 | { 0x3F, 0x02, 0x04, 0x00 }, { 0x0F, 0x03, 0x01, 0x1f }, | ||
54 | { 0x1F, 0x03, 0x02, 0x18 }, { 0x0F, 0x03, 0x01, 0x02 }, | ||
55 | { 0x1F, 0x03, 0x02, 0x1f }, { 0x3F, 0x03, 0x03, 0x00 }, | ||
56 | { 0x1F, 0x04, 0x01, 0x01 }, { 0x1F, 0x04, 0x01, 0x18 }, | ||
57 | { 0x3F, 0x04, 0x02, 0x00 }, | ||
58 | }; | ||
59 | |||
60 | #if FF_API_OLD_CHANNEL_LAYOUT | ||
61 | const uint64_t ff_mlp_channel_layouts[12] = { | ||
62 | AV_CH_LAYOUT_MONO, AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_2_1, | ||
63 | AV_CH_LAYOUT_QUAD, AV_CH_LAYOUT_2POINT1, AV_CH_LAYOUT_SURROUND, | ||
64 | AV_CH_LAYOUT_4POINT0, AV_CH_LAYOUT_5POINT0_BACK, AV_CH_LAYOUT_3POINT1, | ||
65 | AV_CH_LAYOUT_4POINT1, AV_CH_LAYOUT_5POINT1_BACK, 0, | ||
66 | }; | ||
67 | #endif | ||
68 | |||
69 | const AVChannelLayout ff_mlp_ch_layouts[12] = { | ||
70 | AV_CHANNEL_LAYOUT_MONO, AV_CHANNEL_LAYOUT_STEREO, AV_CHANNEL_LAYOUT_2_1, | ||
71 | AV_CHANNEL_LAYOUT_QUAD, AV_CHANNEL_LAYOUT_2POINT1, AV_CHANNEL_LAYOUT_SURROUND, | ||
72 | AV_CHANNEL_LAYOUT_4POINT0, AV_CHANNEL_LAYOUT_5POINT0_BACK, AV_CHANNEL_LAYOUT_3POINT1, | ||
73 | AV_CHANNEL_LAYOUT_4POINT1, AV_CHANNEL_LAYOUT_5POINT1_BACK, { 0 }, | ||
74 | }; | ||
75 | |||
76 | #if CONFIG_SMALL | ||
77 | #define CRC_TABLE_SIZE 257 | ||
78 | #else | ||
79 | #define CRC_TABLE_SIZE 1024 | ||
80 | #endif | ||
81 | static AVCRC crc_63[CRC_TABLE_SIZE]; | ||
82 | static AVCRC crc_1D[CRC_TABLE_SIZE]; | ||
83 | static AVCRC crc_2D[CRC_TABLE_SIZE]; | ||
84 | |||
85 | 4 | static av_cold void mlp_init_crc(void) | |
86 | { | ||
87 | 4 | av_crc_init(crc_63, 0, 8, 0x63, sizeof(crc_63)); | |
88 | 4 | av_crc_init(crc_1D, 0, 8, 0x1D, sizeof(crc_1D)); | |
89 | 4 | av_crc_init(crc_2D, 0, 16, 0x002D, sizeof(crc_2D)); | |
90 | 4 | } | |
91 | |||
92 | 8 | av_cold void ff_mlp_init_crc(void) | |
93 | { | ||
94 | static AVOnce init_static_once = AV_ONCE_INIT; | ||
95 | 8 | ff_thread_once(&init_static_once, mlp_init_crc); | |
96 | 8 | } | |
97 | |||
98 | 3093 | uint16_t ff_mlp_checksum16(const uint8_t *buf, unsigned int buf_size) | |
99 | { | ||
100 | uint16_t crc; | ||
101 | |||
102 | 3093 | crc = av_crc(crc_2D, 0, buf, buf_size - 2); | |
103 | 3093 | crc ^= AV_RL16(buf + buf_size - 2); | |
104 | 3093 | return crc; | |
105 | } | ||
106 | |||
107 | 19204 | uint8_t ff_mlp_checksum8(const uint8_t *buf, unsigned int buf_size) | |
108 | { | ||
109 | 19204 | uint8_t checksum = av_crc(crc_63, 0x3c, buf, buf_size - 1); // crc_63[0xa2] == 0x3c | |
110 | 19204 | checksum ^= buf[buf_size-1]; | |
111 | 19204 | return checksum; | |
112 | } | ||
113 | |||
114 | 1764 | uint8_t ff_mlp_restart_checksum(const uint8_t *buf, unsigned int bit_size) | |
115 | { | ||
116 | int i; | ||
117 | 1764 | int num_bytes = (bit_size + 2) / 8; | |
118 | |||
119 | 1764 | int crc = crc_1D[buf[0] & 0x3f]; | |
120 | 1764 | crc = av_crc(crc_1D, crc, buf + 1, num_bytes - 2); | |
121 | 1764 | crc ^= buf[num_bytes - 1]; | |
122 | |||
123 |
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14108 | for (i = 0; i < ((bit_size + 2) & 7); i++) { |
124 | 12344 | crc <<= 1; | |
125 |
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12344 | if (crc & 0x100) |
126 | 6097 | crc ^= 0x11D; | |
127 | 12344 | crc ^= (buf[num_bytes] >> (7 - i)) & 1; | |
128 | } | ||
129 | |||
130 | 1764 | return crc; | |
131 | } | ||
132 | |||
133 | 50786 | uint8_t ff_mlp_calculate_parity(const uint8_t *buf, unsigned int buf_size) | |
134 | { | ||
135 | 50786 | uint32_t scratch = 0; | |
136 | 50786 | const uint8_t *buf_end = buf + buf_size; | |
137 | |||
138 |
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72392 | for (; ((intptr_t) buf & 3) && buf < buf_end; buf++) |
139 | 21606 | scratch ^= *buf; | |
140 |
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516450 | for (; buf < buf_end - 3; buf += 4) |
141 | 465664 | scratch ^= *((const uint32_t*)buf); | |
142 | |||
143 | 50786 | scratch = xor_32_to_8(scratch); | |
144 | |||
145 |
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87870 | for (; buf < buf_end; buf++) |
146 | 37084 | scratch ^= *buf; | |
147 | |||
148 | 50786 | return scratch; | |
149 | } | ||
150 |