mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-22 15:23:11 +00:00
67 lines
2.4 KiB
C
67 lines
2.4 KiB
C
/*
|
|
* LZO 1x decompression
|
|
* copyright (c) 2006 Reimar Doeffinger
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVUTIL_LZO_H
|
|
#define AVUTIL_LZO_H
|
|
|
|
#include <stdint.h>
|
|
|
|
/** \defgroup errflags Error flags returned by av_lzo1x_decode
|
|
* \{ */
|
|
//! end of the input buffer reached before decoding finished
|
|
#define AV_LZO_INPUT_DEPLETED 1
|
|
//! decoded data did not fit into output buffer
|
|
#define AV_LZO_OUTPUT_FULL 2
|
|
//! a reference to previously decoded data was wrong
|
|
#define AV_LZO_INVALID_BACKPTR 4
|
|
//! a non-specific error in the compressed bitstream
|
|
#define AV_LZO_ERROR 8
|
|
/** \} */
|
|
|
|
#define AV_LZO_INPUT_PADDING 8
|
|
#define AV_LZO_OUTPUT_PADDING 12
|
|
|
|
/**
|
|
* \brief Decodes LZO 1x compressed data.
|
|
* \param out output buffer
|
|
* \param outlen size of output buffer, number of bytes left are returned here
|
|
* \param in input buffer
|
|
* \param inlen size of input buffer, number of bytes left are returned here
|
|
* \return 0 on success, otherwise a combination of the error flags above
|
|
*
|
|
* Make sure all buffers are appropriately padded, in must provide
|
|
* AV_LZO_INPUT_PADDING, out must provide AV_LZO_OUTPUT_PADDING additional bytes.
|
|
*/
|
|
int av_lzo1x_decode(void *out, int *outlen, const void *in, int *inlen);
|
|
|
|
/**
|
|
* \brief deliberately overlapping memcpy implementation
|
|
* \param dst destination buffer; must be padded with 12 additional bytes
|
|
* \param back how many bytes back we start (the initial size of the overlapping window)
|
|
* \param cnt number of bytes to copy, must be >= 0
|
|
*
|
|
* cnt > back is valid, this will copy the bytes we just copied,
|
|
* thus creating a repeating pattern with a period length of back.
|
|
*/
|
|
void av_memcpy_backptr(uint8_t *dst, int back, int cnt);
|
|
|
|
#endif /* AVUTIL_LZO_H */
|