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crc: move doxy to the header

This commit is contained in:
Anton Khirnov 2012-11-02 10:58:36 +01:00
parent b68aac7ea3
commit b4dc6dccba
2 changed files with 30 additions and 28 deletions
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28
libavutil/crc.c
View File

@ -40,22 +40,6 @@ static struct {
static AVCRC av_crc_table[AV_CRC_MAX][257]; static AVCRC av_crc_table[AV_CRC_MAX][257];
#endif #endif
/**
* Initialize a CRC table.
* @param ctx must be an array of size sizeof(AVCRC)*257 or sizeof(AVCRC)*1024
* @param le If 1, the lowest bit represents the coefficient for the highest
* exponent of the corresponding polynomial (both for poly and
* actual CRC).
* If 0, you must swap the CRC parameter and the result of av_crc
* if you need the standard representation (can be simplified in
* most cases to e.g. bswap16):
* av_bswap32(crc << (32-bits))
* @param bits number of bits for the CRC
* @param poly generator polynomial without the x**bits coefficient, in the
* representation as specified by le
* @param ctx_size size of ctx in bytes
* @return <0 on failure
*/
int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size) int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size)
{ {
unsigned i, j; unsigned i, j;
@ -89,11 +73,6 @@ int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size)
return 0; return 0;
} }
/**
* Get an initialized standard CRC table.
* @param crc_id ID of a standard CRC
* @return a pointer to the CRC table or NULL on failure
*/
const AVCRC *av_crc_get_table(AVCRCId crc_id) const AVCRC *av_crc_get_table(AVCRCId crc_id)
{ {
#if !CONFIG_HARDCODED_TABLES #if !CONFIG_HARDCODED_TABLES
@ -108,13 +87,6 @@ const AVCRC *av_crc_get_table(AVCRCId crc_id)
return av_crc_table[crc_id]; return av_crc_table[crc_id];
} }
/**
* Calculate the CRC of a block.
* @param crc CRC of previous blocks if any or initial value for CRC
* @return CRC updated with the data from the given block
*
* @see av_crc_init() "le" parameter
*/
uint32_t av_crc(const AVCRC *ctx, uint32_t crc, uint32_t av_crc(const AVCRC *ctx, uint32_t crc,
const uint8_t *buffer, size_t length) const uint8_t *buffer, size_t length)
{ {

30
libavutil/crc.h
View File

@ -36,8 +36,38 @@ typedef enum {
AV_CRC_MAX, /*< Not part of public API! Do not use outside libavutil. */ AV_CRC_MAX, /*< Not part of public API! Do not use outside libavutil. */
}AVCRCId; }AVCRCId;
/**
* Initialize a CRC table.
* @param ctx must be an array of size sizeof(AVCRC)*257 or sizeof(AVCRC)*1024
* @param le If 1, the lowest bit represents the coefficient for the highest
* exponent of the corresponding polynomial (both for poly and
* actual CRC).
* If 0, you must swap the CRC parameter and the result of av_crc
* if you need the standard representation (can be simplified in
* most cases to e.g. bswap16):
* av_bswap32(crc << (32-bits))
* @param bits number of bits for the CRC
* @param poly generator polynomial without the x**bits coefficient, in the
* representation as specified by le
* @param ctx_size size of ctx in bytes
* @return <0 on failure
*/
int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size); int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size);
/**
* Get an initialized standard CRC table.
* @param crc_id ID of a standard CRC
* @return a pointer to the CRC table or NULL on failure
*/
const AVCRC *av_crc_get_table(AVCRCId crc_id); const AVCRC *av_crc_get_table(AVCRCId crc_id);
/**
* Calculate the CRC of a block.
* @param crc CRC of previous blocks if any or initial value for CRC
* @return CRC updated with the data from the given block
*
* @see av_crc_init() "le" parameter
*/
uint32_t av_crc(const AVCRC *ctx, uint32_t start_crc, const uint8_t *buffer, size_t length) av_pure; uint32_t av_crc(const AVCRC *ctx, uint32_t start_crc, const uint8_t *buffer, size_t length) av_pure;
#endif /* AVUTIL_CRC_H */ #endif /* AVUTIL_CRC_H */