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17ee24af7e
Some uses of Snappy require uncompressing to positions within an existing buffer. Also adds a function to get the uncompressed length of Snappy data. Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/*
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* Snappy module
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* Copyright (c) Luca Barbato
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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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* Snappy decompression
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*
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* Snappy is a compression/decompression algorithm that does not aim for
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* maximum compression, but rather for very high speeds and reasonable
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* compression.
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*
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* http://en.wikipedia.org/wiki/Snappy_%28software%29
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*/
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#ifndef AVCODEC_SNAPPY_H
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#define AVCODEC_SNAPPY_H
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#include <stdint.h>
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#include "bytestream.h"
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/**
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* Get the uncompressed length of an input buffer compressed using the Snappy
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* algorithm. The GetByteContext is not advanced.
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*
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* @param gb input GetByteContext.
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* @return A positive length on success, AVERROR otherwise.
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*/
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int64_t ff_snappy_peek_uncompressed_length(GetByteContext *gb);
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/**
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* Decompress an input buffer using Snappy algorithm.
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*
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* @param gb input GetByteContext.
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* @param buf input buffer pointer.
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* @param size input/output on input, the size of buffer, on output, the size
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* of the uncompressed data.
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* @return 0 if success, AVERROR otherwise.
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*/
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int ff_snappy_uncompress(GetByteContext *gb, uint8_t *buf, int64_t *size);
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#endif /* AVCODEC_SNAPPY_H */
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