Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / huffyuv.c
CommitLineData
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
39int 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
58av_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
71av_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
87av_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}