Revision 45e3c163

View differences:

libavutil/crc.c
37 37
``` * Inits a crc table.
```
38 38
``` * @param ctx must be an array of sizeof(AVCRC)*257 or sizeof(AVCRC)*1024
```
39 39
``` * @param cts_size size of ctx in bytes
```
40
``` * @param le if 1, lowest bit represents coefficient for highest exponent
```
41
``` *           of corresponding polynomial (both for poly and actual CRC).
```
42
``` *           If 0, you must swap the crc parameter and the result of av_crc
```
43
``` *           if you need the standard representation (can be simplified in
```
44
``` *           most cases to e.g. bswap16):
```
45
``` *           bswap_32(crc << (32-bits))
```
46
``` * @param bits number of bits for the CRC
```
47
``` * @param poly generator polynomial without the x**bits coefficient, in the
```
48
``` *             representation as specified by le
```
40 49
``` * @return <0 on failure
```
41 50
``` */
```
42 51
```int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size){
```
......
70 79
```    return 0;
```
71 80
```}
```
72 81

82
```/**
```
83
``` * Calculate the CRC of a block
```
84
``` * @param crc CRC of previous blocks if any or initial value for CRC.
```
85
``` * @return CRC updated with the data from the given block
```
86
``` *
```
87
``` * @see av_crc_init() "le" parameter
```
88
``` */
```
73 89
```uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length){
```
74 90
```    const uint8_t *end= buffer+length;
```
75 91

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