*
* @param str input string
* @param pfx prefix to test
- * @param ptr updated after the prefix in str in there is a match
+ * @param ptr updated if the prefix is matched inside str
* @return non-zero if the prefix matches, zero otherwise
*/
int av_strstart(const char *str, const char *pfx, const char **ptr);
*
* @param str input string
* @param pfx prefix to test
- * @param ptr updated after the prefix in str in there is a match
+ * @param ptr updated if the prefix is matched inside str
* @return non-zero if the prefix matches, zero otherwise
*/
int av_stristart(const char *str, const char *pfx, const char **ptr);
#endif
/**
- * Inits a crc table.
- * @param ctx must be an array of sizeof(AVCRC)*257 or sizeof(AVCRC)*1024
+ * Initializes a CRC table.
+ * @param ctx must be an array of size sizeof(AVCRC)*257 or sizeof(AVCRC)*1024
* @param cts_size size of ctx in bytes
- * @param le if 1, lowest bit represents coefficient for highest exponent
- * of corresponding polynomial (both for poly and actual CRC).
- * If 0, you must swap the crc parameter and the result of av_crc
+ * @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):
* bswap_32(crc << (32-bits))
#include "common.h"
/**
- * \brief en- or decrypt an 64-bit block of data with DES
- * \param in data to process.
- * \param key key to use for en-/decryption.
- * \param decrypt if 0 encrypt, else decrypt.
+ * \brief Encrypt/decrypt a 64-bit block of data with DES.
+ * \param in data to process
+ * \param key key to use for encryption/decryption
+ * \param decrypt if 0 encrypt, else decrypt
* \return processed data
*
- * If your input data is in 8-bit blocks treat it as big-endian
+ * If your input data is in 8-bit blocks, treat it as big-endian
* (use e.g. AV_RB64 and AV_WB64).
*/
uint64_t ff_des_encdec(uint64_t in, uint64_t key, int decrypt) av_const;
AVInteger av_sub_i(AVInteger a, AVInteger b) av_const;
/**
- * returns the rounded down value of the logarithm of base 2 of the given AVInteger.
- * this is simply the index of the most significant bit which is 1. Or 0 of all bits are 0
+ * Returns the rounded-down value of the base 2 logarithm of the given
+ * AVInteger. This is simply the index of the most significant bit
+ * which is 1, or 0 if all bits are 0.
*/
int av_log2_i(AVInteger a) av_const;
AVInteger av_mul_i(AVInteger a, AVInteger b) av_const;
}
#endif
-/* avoid usage of various functions */
+/* avoid usage of dangerous/inappropriate system functions */
#undef malloc
#define malloc please_use_av_malloc
#undef free
/**
* @file log.c
- * log.
+ * logging functions
*/
#include "avutil.h"
#define AV_LOG_PANIC 0
/**
- * something went wrong and recovery is not possible
- * like no header in a format which depends on it or a combination
- * of parameters which are not allowed
+ * Something went wrong and recovery is not possible.
+ * For example, no header was found for a format which depends
+ * on headers or an illegal combination of parameters is used.
*/
#define AV_LOG_FATAL 8
/**
- * something went wrong and cannot losslessly be recovered
- * but not all future data is affected
+ * Something went wrong and cannot losslessly be recovered.
+ * However, not all future data is affected.
*/
#define AV_LOG_ERROR 16
/**
- * something somehow does not look correct / something which may or may not
- * lead to some problems like use of -vstrict -2
+ * Something somehow does not look correct. This may or may not
+ * lead to problems. An example would be the use of '-vstrict -2'.
*/
#define AV_LOG_WARNING 24
/*
- * Mersenne Twister Random Algorithm
+ * Mersenne Twister PRNG algorithm
* Copyright (c) 2006 Ryan Martell
* Based on a C program for MT19937, with initialization improved 2002/1/26.
* Coded by Takuji Nishimura and Makoto Matsumoto.
/*
- * Mersenne Twister Random Algorithm
+ * Mersenne Twister PRNG algorithm
* Copyright (c) 2006 Ryan Martell
* Based on a C program for MT19937, with initialization improved 2002/1/26.
* Coded by Takuji Nishimura and Makoto Matsumoto.
/**
* Generates a random number from the interval [0,0xffffffff].
*
- * Please do NOT use the Mersenne Twister, it is slow. Use the random generator
- * from lfg.c/h or a simple LCG like state= state*1664525+1013904223.
+ * Please do NOT use the Mersenne Twister, it is slow. Use the random number
+ * generator from lfg.c/h or a simple LCG like state = state*1664525+1013904223.
* If you still choose to use MT, expect that you will have to provide
* some evidence that it makes a difference for the case where you use it.
*/
return y;
}
-/** Return random in range [0-1] as double. */
+/** Returns a random number in the range [0-1] as double. */
static inline double av_random_real1(AVRandomState *state)
{
/* divided by 2^32-1 */