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53 lines
1.8 KiB
53 lines
1.8 KiB
/* |
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* VP5/6/8 decoder |
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* Copyright (c) 2010 Fiona Glaser <fiona@x264.com> |
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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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#include <stdint.h> |
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#include "libavutil/error.h" |
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#include "bytestream.h" |
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#include "vp56.h" |
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const uint8_t ff_vp56_norm_shift[256]= { |
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8,7,6,6,5,5,5,5,4,4,4,4,4,4,4,4, |
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3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, |
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2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, |
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2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, |
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, |
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, |
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, |
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
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}; |
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int ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size) |
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{ |
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c->high = 255; |
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c->bits = -16; |
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c->buffer = buf; |
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c->end = buf + buf_size; |
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c->end_reached = 0; |
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if (buf_size < 1) |
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return AVERROR_INVALIDDATA; |
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c->code_word = bytestream_get_be24(&c->buffer); |
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return 0; |
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}
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