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/* |
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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 "bswapdsp.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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✓✓ |
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for (len = 32; len > 0; len--) { |
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✓✓ |
26774496 |
for (index = 0; index < n; index++) { |
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✓✓ |
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if (len_table[index] == len) |
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dst[index] = bits++; |
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} |
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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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✓✓ |
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for (i=0; i<3; i++) { |
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s->temp[i]= av_malloc(4*s->width + 16); |
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✗✓ |
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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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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_bswapdsp_init(&s->bdsp); |
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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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✓✓ |
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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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} |