2 * huffyuv codec for libavcodec
4 * Copyright (c) 2002-2003 Michael Niedermayer <michaelni@gmx.at>
6 * see http://www.pcisys.net/~melanson/codecs/huffyuv.txt for a description of
9 * This file is part of FFmpeg.
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.
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.
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
28 * huffyuv codec for libavcodec.
33 #include "libavutil/mem.h"
39 int ff_huffyuv_generate_bits_table(uint32_t *dst, const uint8_t *len_table)
44 for (len = 32; len > 0; len--) {
45 for (index = 0; index < 256; index++) {
46 if (len_table[index] == len)
50 av_log(NULL, AV_LOG_ERROR, "Error generating huffman table\n");
58 av_cold int ff_huffyuv_alloc_temp(HYuvContext *s)
62 if (s->bitstream_bpp<24) {
64 s->temp[i]= av_malloc(s->width + 16);
66 return AVERROR(ENOMEM);
69 s->temp[0]= av_mallocz(4*s->width + 16);
71 return AVERROR(ENOMEM);
76 av_cold void ff_huffyuv_common_init(AVCodecContext *avctx)
78 HYuvContext *s = avctx->priv_data;
81 s->flags = avctx->flags;
83 ff_dsputil_init(&s->dsp, avctx);
85 s->width = avctx->width;
86 s->height = avctx->height;
88 av_assert1(s->width > 0 && s->height > 0);
91 av_cold void ff_huffyuv_common_end(HYuvContext *s)
95 for(i = 0; i < 3; i++) {
96 av_freep(&s->temp[i]);