Commit | Line | Data |
---|---|---|
2ba45a60 DM |
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 | int ff_huffyuv_generate_bits_table(uint32_t *dst, const uint8_t *len_table, int n) | |
40 | { | |
41 | int len, index; | |
42 | uint32_t bits = 0; | |
43 | ||
44 | for (len = 32; len > 0; len--) { | |
45 | for (index = 0; index < n; index++) { | |
46 | if (len_table[index] == len) | |
47 | dst[index] = bits++; | |
48 | } | |
49 | if (bits & 1) { | |
50 | av_log(NULL, AV_LOG_ERROR, "Error generating huffman table\n"); | |
51 | return -1; | |
52 | } | |
53 | bits >>= 1; | |
54 | } | |
55 | return 0; | |
56 | } | |
57 | ||
58 | av_cold int ff_huffyuv_alloc_temp(HYuvContext *s) | |
59 | { | |
60 | int i; | |
61 | ||
62 | for (i=0; i<3; i++) { | |
63 | s->temp[i]= av_malloc(4*s->width + 16); | |
64 | if (!s->temp[i]) | |
65 | return AVERROR(ENOMEM); | |
66 | s->temp16[i] = (uint16_t*)s->temp[i]; | |
67 | } | |
68 | return 0; | |
69 | } | |
70 | ||
71 | av_cold void ff_huffyuv_common_init(AVCodecContext *avctx) | |
72 | { | |
73 | HYuvContext *s = avctx->priv_data; | |
74 | ||
75 | s->avctx = avctx; | |
76 | s->flags = avctx->flags; | |
77 | ||
78 | ff_bswapdsp_init(&s->bdsp); | |
79 | ff_llviddsp_init(&s->llviddsp, avctx); | |
80 | ||
81 | s->width = avctx->width; | |
82 | s->height = avctx->height; | |
83 | ||
84 | av_assert1(s->width > 0 && s->height > 0); | |
85 | } | |
86 | ||
87 | av_cold void ff_huffyuv_common_end(HYuvContext *s) | |
88 | { | |
89 | int i; | |
90 | ||
91 | for(i = 0; i < 3; i++) { | |
92 | av_freep(&s->temp[i]); | |
93 | s->temp16[i] = NULL; | |
94 | } | |
95 | } |