static AVCRC av_crc_table[AV_CRC_MAX][257];
#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)
{
unsigned i, j;
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)
{
#if !CONFIG_HARDCODED_TABLES
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,
const uint8_t *buffer, size_t length)
{
AV_CRC_MAX, /*< Not part of public API! Do not use outside libavutil. */
}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);
+
+/**
+ * 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);
+
+/**
+ * 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;
#endif /* AVUTIL_CRC_H */