FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/mlp.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 38 38 100.0%
Branches: 11 12 91.7%

Line Branch Exec Source
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 const uint64_t ff_mlp_channel_layouts[12] = {
61 AV_CH_LAYOUT_MONO, AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_2_1,
62 AV_CH_LAYOUT_QUAD, AV_CH_LAYOUT_2POINT1, AV_CH_LAYOUT_SURROUND,
63 AV_CH_LAYOUT_4POINT0, AV_CH_LAYOUT_5POINT0_BACK, AV_CH_LAYOUT_3POINT1,
64 AV_CH_LAYOUT_4POINT1, AV_CH_LAYOUT_5POINT1_BACK, 0,
65 };
66
67 #if CONFIG_SMALL
68 #define CRC_TABLE_SIZE 257
69 #else
70 #define CRC_TABLE_SIZE 1024
71 #endif
72 static AVCRC crc_63[CRC_TABLE_SIZE];
73 static AVCRC crc_1D[CRC_TABLE_SIZE];
74 static AVCRC crc_2D[CRC_TABLE_SIZE];
75
76 4 static av_cold void mlp_init_crc(void)
77 {
78 4 av_crc_init(crc_63, 0, 8, 0x63, sizeof(crc_63));
79 4 av_crc_init(crc_1D, 0, 8, 0x1D, sizeof(crc_1D));
80 4 av_crc_init(crc_2D, 0, 16, 0x002D, sizeof(crc_2D));
81 4 }
82
83 8 av_cold void ff_mlp_init_crc(void)
84 {
85 static AVOnce init_static_once = AV_ONCE_INIT;
86 8 ff_thread_once(&init_static_once, mlp_init_crc);
87 8 }
88
89 3093 uint16_t ff_mlp_checksum16(const uint8_t *buf, unsigned int buf_size)
90 {
91 uint16_t crc;
92
93 3093 crc = av_crc(crc_2D, 0, buf, buf_size - 2);
94 3093 crc ^= AV_RL16(buf + buf_size - 2);
95 3093 return crc;
96 }
97
98 19204 uint8_t ff_mlp_checksum8(const uint8_t *buf, unsigned int buf_size)
99 {
100 19204 uint8_t checksum = av_crc(crc_63, 0x3c, buf, buf_size - 1); // crc_63[0xa2] == 0x3c
101 19204 checksum ^= buf[buf_size-1];
102 19204 return checksum;
103 }
104
105 1764 uint8_t ff_mlp_restart_checksum(const uint8_t *buf, unsigned int bit_size)
106 {
107 int i;
108 1764 int num_bytes = (bit_size + 2) / 8;
109
110 1764 int crc = crc_1D[buf[0] & 0x3f];
111 1764 crc = av_crc(crc_1D, crc, buf + 1, num_bytes - 2);
112 1764 crc ^= buf[num_bytes - 1];
113
114
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14108 for (i = 0; i < ((bit_size + 2) & 7); i++) {
115 12344 crc <<= 1;
116
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12344 if (crc & 0x100)
117 6097 crc ^= 0x11D;
118 12344 crc ^= (buf[num_bytes] >> (7 - i)) & 1;
119 }
120
121 1764 return crc;
122 }
123
124 50786 uint8_t ff_mlp_calculate_parity(const uint8_t *buf, unsigned int buf_size)
125 {
126 50786 uint32_t scratch = 0;
127 50786 const uint8_t *buf_end = buf + buf_size;
128
129
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72392 for (; ((intptr_t) buf & 3) && buf < buf_end; buf++)
130 21606 scratch ^= *buf;
131
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516450 for (; buf < buf_end - 3; buf += 4)
132 465664 scratch ^= *((const uint32_t*)buf);
133
134 50786 scratch = xor_32_to_8(scratch);
135
136
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87870 for (; buf < buf_end; buf++)
137 37084 scratch ^= *buf;
138
139 50786 return scratch;
140 }
141