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