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1 | /* | ||
2 | * This file is part of FFmpeg. | ||
3 | * | ||
4 | * FFmpeg is free software; you can redistribute it and/or | ||
5 | * modify it under the terms of the GNU Lesser General Public | ||
6 | * License as published by the Free Software Foundation; either | ||
7 | * version 2.1 of the License, or (at your option) any later version. | ||
8 | * | ||
9 | * FFmpeg is distributed in the hope that it will be useful, | ||
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
12 | * Lesser General Public License for more details. | ||
13 | * | ||
14 | * You should have received a copy of the GNU Lesser General Public | ||
15 | * License along with FFmpeg; if not, write to the Free Software | ||
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
17 | */ | ||
18 | |||
19 | #include <stddef.h> | ||
20 | #include <stdint.h> | ||
21 | |||
22 | #include "atsc_a53.h" | ||
23 | #include "get_bits.h" | ||
24 | |||
25 | ✗ | int ff_alloc_a53_sei(const AVFrame *frame, size_t prefix_len, | |
26 | void **data, size_t *sei_size) | ||
27 | { | ||
28 | ✗ | AVFrameSideData *side_data = NULL; | |
29 | uint8_t *sei_data; | ||
30 | |||
31 | ✗ | if (frame) | |
32 | ✗ | side_data = av_frame_get_side_data(frame, AV_FRAME_DATA_A53_CC); | |
33 | |||
34 | ✗ | if (!side_data) { | |
35 | ✗ | *data = NULL; | |
36 | ✗ | return 0; | |
37 | } | ||
38 | |||
39 | ✗ | *sei_size = side_data->size + 11; | |
40 | ✗ | *data = av_mallocz(*sei_size + prefix_len); | |
41 | ✗ | if (!*data) | |
42 | ✗ | return AVERROR(ENOMEM); | |
43 | ✗ | sei_data = (uint8_t*)*data + prefix_len; | |
44 | |||
45 | // country code | ||
46 | ✗ | sei_data[0] = 181; | |
47 | ✗ | sei_data[1] = 0; | |
48 | ✗ | sei_data[2] = 49; | |
49 | |||
50 | /** | ||
51 | * 'GA94' is standard in North America for ATSC, but hard coding | ||
52 | * this style may not be the right thing to do -- other formats | ||
53 | * do exist. This information is not available in the side_data | ||
54 | * so we are going with this right now. | ||
55 | */ | ||
56 | ✗ | AV_WL32(sei_data + 3, MKTAG('G', 'A', '9', '4')); | |
57 | ✗ | sei_data[7] = 3; | |
58 | ✗ | sei_data[8] = ((side_data->size/3) & 0x1f) | 0x40; | |
59 | ✗ | sei_data[9] = 0; | |
60 | |||
61 | ✗ | memcpy(sei_data + 10, side_data->data, side_data->size); | |
62 | |||
63 | ✗ | sei_data[side_data->size+10] = 255; | |
64 | |||
65 | ✗ | return 0; | |
66 | } | ||
67 | |||
68 | 6 | int ff_parse_a53_cc(AVBufferRef **pbuf, const uint8_t *data, int size) | |
69 | { | ||
70 | 6 | AVBufferRef *buf = *pbuf; | |
71 | GetBitContext gb; | ||
72 |
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6 | size_t new_size, old_size = buf ? buf->size : 0; |
73 | int ret, cc_count; | ||
74 | |||
75 |
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6 | if (size < 3) |
76 | ✗ | return AVERROR_INVALIDDATA; | |
77 | |||
78 | 6 | ret = init_get_bits8(&gb, data, size); | |
79 |
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6 | if (ret < 0) |
80 | ✗ | return ret; | |
81 | |||
82 |
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6 | if (get_bits(&gb, 8) != 0x3) // user_data_type_code |
83 | ✗ | return 0; | |
84 | |||
85 | 6 | skip_bits(&gb, 1); // reserved | |
86 |
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6 | if (!get_bits(&gb, 1)) // process_cc_data_flag |
87 | ✗ | return 0; | |
88 | |||
89 | 6 | skip_bits(&gb, 1); // zero bit | |
90 | 6 | cc_count = get_bits(&gb, 5); | |
91 |
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6 | if (!cc_count) |
92 | ✗ | return 0; | |
93 | |||
94 | 6 | skip_bits(&gb, 8); // reserved | |
95 | |||
96 | /* 3 bytes per CC plus one byte marker_bits at the end */ | ||
97 |
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6 | if (cc_count * 3 >= (get_bits_left(&gb) >> 3)) |
98 | ✗ | return AVERROR_INVALIDDATA; | |
99 | |||
100 | 6 | new_size = (old_size + cc_count * 3); | |
101 | |||
102 |
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6 | if (new_size > INT_MAX) |
103 | ✗ | return AVERROR_INVALIDDATA; | |
104 | |||
105 | /* Allow merging of the cc data from two fields. */ | ||
106 | 6 | ret = av_buffer_realloc(pbuf, new_size); | |
107 |
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6 | if (ret < 0) |
108 | ✗ | return ret; | |
109 | |||
110 | 6 | buf = *pbuf; | |
111 | /* Use of av_buffer_realloc assumes buffer is writeable */ | ||
112 |
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19 | for (int i = 0; i < cc_count; i++) { |
113 | 13 | buf->data[old_size++] = get_bits(&gb, 8); | |
114 | 13 | buf->data[old_size++] = get_bits(&gb, 8); | |
115 | 13 | buf->data[old_size++] = get_bits(&gb, 8); | |
116 | } | ||
117 | |||
118 | 6 | return cc_count; | |
119 | } | ||
120 |