101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
/*
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* huffyuv codec for libavcodec
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*
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* Copyright (c) 2002-2014 Michael Niedermayer <michaelni@gmx.at>
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*
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* see http://www.pcisys.net/~melanson/codecs/huffyuv.txt for a description of
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* the algorithm used
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* huffyuv codec for libavcodec.
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*/
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#include <stdint.h>
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#include "libavutil/mem.h"
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#include "avcodec.h"
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#include "huffyuv.h"
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int ff_huffyuv_generate_bits_table(uint32_t *dst, const uint8_t *len_table, int n)
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{
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int len, index;
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uint32_t bits = 0;
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for (len = 32; len > 0; len--) {
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for (index = 0; index < n; index++) {
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if (len_table[index] == len)
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dst[index] = bits++;
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}
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if (bits & 1) {
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av_log(NULL, AV_LOG_ERROR, "Error generating huffman table\n");
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return -1;
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}
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bits >>= 1;
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}
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return 0;
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}
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av_cold int ff_huffyuv_alloc_temp(HYuvContext *s)
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{
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int i;
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if (s->bitstream_bpp<24) {
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for (i=0; i<3; i++) {
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s->temp[i]= av_malloc(2*s->width + 16);
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if (!s->temp[i])
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return AVERROR(ENOMEM);
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s->temp16[i] = (uint16_t*)s->temp[i];
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}
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} else {
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s->temp[0]= av_mallocz(4*s->width + 16);
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if (!s->temp[0])
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return AVERROR(ENOMEM);
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}
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return 0;
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}
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av_cold void ff_huffyuv_common_init(AVCodecContext *avctx)
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{
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HYuvContext *s = avctx->priv_data;
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s->avctx = avctx;
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s->flags = avctx->flags;
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ff_dsputil_init(&s->dsp, avctx);
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ff_llviddsp_init(&s->llviddsp, avctx);
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s->width = avctx->width;
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s->height = avctx->height;
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av_assert1(s->width > 0 && s->height > 0);
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}
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av_cold void ff_huffyuv_common_end(HYuvContext *s)
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{
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int i;
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for(i = 0; i < 3; i++) {
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av_freep(&s->temp[i]);
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s->temp16[i] = NULL;
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}
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}
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