Directory: | ../../../ffmpeg/ |
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File: | src/libavcodec/huffyuv.c |
Date: | 2022-07-04 00:18:54 |
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Lines: | 28 | 31 | 90.3% |
Branches: | 12 | 14 | 85.7% |
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1 | /* | ||
2 | * huffyuv codec for libavcodec | ||
3 | * | ||
4 | * Copyright (c) 2002-2014 Michael Niedermayer <michaelni@gmx.at> | ||
5 | * | ||
6 | * see http://www.pcisys.net/~melanson/codecs/huffyuv.txt for a description of | ||
7 | * the algorithm used | ||
8 | * | ||
9 | * This file is part of FFmpeg. | ||
10 | * | ||
11 | * FFmpeg is free software; you can redistribute it and/or | ||
12 | * modify it under the terms of the GNU Lesser General Public | ||
13 | * License as published by the Free Software Foundation; either | ||
14 | * version 2.1 of the License, or (at your option) any later version. | ||
15 | * | ||
16 | * FFmpeg is distributed in the hope that it will be useful, | ||
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
19 | * Lesser General Public License for more details. | ||
20 | * | ||
21 | * You should have received a copy of the GNU Lesser General Public | ||
22 | * License along with FFmpeg; if not, write to the Free Software | ||
23 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
24 | */ | ||
25 | |||
26 | /** | ||
27 | * @file | ||
28 | * huffyuv codec for libavcodec. | ||
29 | */ | ||
30 | |||
31 | #include <stdint.h> | ||
32 | |||
33 | #include "libavutil/mem.h" | ||
34 | |||
35 | #include "avcodec.h" | ||
36 | #include "bswapdsp.h" | ||
37 | #include "huffyuv.h" | ||
38 | |||
39 | 351 | int ff_huffyuv_generate_bits_table(uint32_t *dst, const uint8_t *len_table, int n) | |
40 | { | ||
41 | int len, index; | ||
42 | 351 | uint32_t bits = 0; | |
43 | |||
44 |
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11583 | for (len = 32; len > 0; len--) { |
45 |
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26774496 | for (index = 0; index < n; index++) { |
46 |
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26763264 | if (len_table[index] == len) |
47 | 836352 | dst[index] = bits++; | |
48 | } | ||
49 |
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11232 | if (bits & 1) { |
50 | ✗ | av_log(NULL, AV_LOG_ERROR, "Error generating huffman table\n"); | |
51 | ✗ | return -1; | |
52 | } | ||
53 | 11232 | bits >>= 1; | |
54 | } | ||
55 | 351 | return 0; | |
56 | } | ||
57 | |||
58 | 117 | av_cold int ff_huffyuv_alloc_temp(HYuvContext *s) | |
59 | { | ||
60 | int i; | ||
61 | |||
62 |
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468 | for (i=0; i<3; i++) { |
63 | 351 | s->temp[i]= av_malloc(4*s->width + 16); | |
64 |
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351 | if (!s->temp[i]) |
65 | ✗ | return AVERROR(ENOMEM); | |
66 | 351 | s->temp16[i] = (uint16_t*)s->temp[i]; | |
67 | } | ||
68 | 117 | return 0; | |
69 | } | ||
70 | |||
71 | 117 | av_cold void ff_huffyuv_common_init(AVCodecContext *avctx) | |
72 | { | ||
73 | 117 | HYuvContext *s = avctx->priv_data; | |
74 | |||
75 | 117 | s->avctx = avctx; | |
76 | 117 | s->flags = avctx->flags; | |
77 | |||
78 | 117 | ff_bswapdsp_init(&s->bdsp); | |
79 | |||
80 | 117 | s->width = avctx->width; | |
81 | 117 | s->height = avctx->height; | |
82 | |||
83 | av_assert1(s->width > 0 && s->height > 0); | ||
84 | 117 | } | |
85 | |||
86 | 117 | av_cold void ff_huffyuv_common_end(HYuvContext *s) | |
87 | { | ||
88 | int i; | ||
89 | |||
90 |
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468 | for(i = 0; i < 3; i++) { |
91 | 351 | av_freep(&s->temp[i]); | |
92 | 351 | s->temp16[i] = NULL; | |
93 | } | ||
94 | 117 | } | |
95 |