mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
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
/*
|
|
* Snappy module
|
|
* Copyright (c) Luca Barbato
|
|
*
|
|
* 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
|
|
* Snappy decompression
|
|
*
|
|
* Snappy is a compression/decompression algorithm that does not aim for
|
|
* maximum compression, but rather for very high speeds and reasonable
|
|
* compression.
|
|
*
|
|
* http://en.wikipedia.org/wiki/Snappy_%28software%29
|
|
*/
|
|
|
|
#ifndef AVCODEC_SNAPPY_H
|
|
#define AVCODEC_SNAPPY_H
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "bytestream.h"
|
|
|
|
/**
|
|
* Get the uncompressed length of an input buffer compressed using the Snappy
|
|
* algorithm. The GetByteContext is not advanced.
|
|
*
|
|
* @param gb input GetByteContext.
|
|
* @return A positive length on success, AVERROR otherwise.
|
|
*/
|
|
int64_t ff_snappy_peek_uncompressed_length(GetByteContext *gb);
|
|
|
|
/**
|
|
* Decompress an input buffer using Snappy algorithm.
|
|
*
|
|
* @param gb input GetByteContext.
|
|
* @param buf input buffer pointer.
|
|
* @param size input/output on input, the size of buffer, on output, the size
|
|
* of the uncompressed data.
|
|
* @return 0 if success, AVERROR otherwise.
|
|
*/
|
|
int ff_snappy_uncompress(GetByteContext *gb, uint8_t *buf, int64_t *size);
|
|
|
|
#endif /* AVCODEC_SNAPPY_H */
|