mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
66 lines
2.4 KiB
66 lines
2.4 KiB
/* |
|
* 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 */
|
|
|