blob: e582060cc3c86fa449d55270faba2b174d2d491f
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 | |
80 | s->width = avctx->width; |
81 | s->height = avctx->height; |
82 | |
83 | av_assert1(s->width > 0 && s->height > 0); |
84 | } |
85 | |
86 | av_cold void ff_huffyuv_common_end(HYuvContext *s) |
87 | { |
88 | int i; |
89 | |
90 | for(i = 0; i < 3; i++) { |
91 | av_freep(&s->temp[i]); |
92 | s->temp16[i] = NULL; |
93 | } |
94 | } |
95 |