diff options
Diffstat (limited to 'libavutil/lzo.h')
| -rw-r--r-- | libavutil/lzo.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/libavutil/lzo.h b/libavutil/lzo.h index f1c1ce99b4..5431c1b5cf 100644 --- a/libavutil/lzo.h +++ b/libavutil/lzo.h @@ -32,8 +32,28 @@ #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 error flags, see lzo.h + * + * 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 */ |