1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file fifo.h
* A very simple circular buffer FIFO implementation.
*/
#ifndef FFMPEG_FIFO_H
#define FFMPEG_FIFO_H
#include <stdint.h>
typedef struct AVFifoBuffer {
uint8_t *buffer;
uint8_t *rptr, *wptr, *end;
} AVFifoBuffer;
/**
* Initializes an AVFifoBuffer.
* @param *f AVFifoBuffer to initialize
* @param size of FIFO
* @return <0 for failure >=0 otherwise
*/
int av_fifo_init(AVFifoBuffer *f, int size);
/**
* Frees an AVFifoBuffer.
* @param *f AVFifoBuffer to free
*/
void av_fifo_free(AVFifoBuffer *f);
/**
* Returns the amount of data in bytes in the AVFifoBuffer, that is the
* amount of data you can read from it.
* @param *f AVFifoBuffer to read from
* @return size
*/
int av_fifo_size(AVFifoBuffer *f);
/**
* Reads data from an AVFifoBuffer.
* @param *f AVFifoBuffer to read from
* @param *buf data destination
* @param buf_size number of bytes to read
*/
int av_fifo_read(AVFifoBuffer *f, uint8_t *buf, int buf_size);
/**
* Feeds data from an AVFifoBuffer to a user supplied callback.
* @param *f AVFifoBuffer to read from
* @param buf_size number of bytes to read
* @param *func generic read function
* @param *dest data destination
*/
int av_fifo_generic_read(AVFifoBuffer *f, int buf_size, void (*func)(void*, void*, int), void* dest);
/**
* Writes data into an AVFifoBuffer.
* @param *f AVFifoBuffer to write to
* @param *buf data source
* @param size data size
*/
attribute_deprecated void av_fifo_write(AVFifoBuffer *f, const uint8_t *buf, int size);
/**
* Feeds data from a user supplied callback to an AVFifoBuffer.
* @param *f AVFifoBuffer to write to
* @param *src data source
* @param size number of bytes to write
* @param *func generic write function. First parameter is src,
* second is dest_buf, third is dest_buf_size.
* func must return the number of bytes written to dest_buf, or <= 0 to
* indicate no more data available to write.
* If func is NULL, src is interpreted as a simple byte array for source data.
* @return the number of bytes written to the fifo.
*/
int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size, int (*func)(void*, void*, int));
/**
* Resizes an AVFifoBuffer.
* @param *f AVFifoBuffer to resize
* @param size new AVFifoBuffer size in bytes
*/
void av_fifo_realloc(AVFifoBuffer *f, unsigned int size);
/**
* Reads and discards the specified amount of data from an AVFifoBuffer.
* @param *f AVFifoBuffer to read from
* @param size amount of data to read in bytes
*/
void av_fifo_drain(AVFifoBuffer *f, int size);
static inline uint8_t av_fifo_peek(AVFifoBuffer *f, int offs)
{
uint8_t *ptr = f->rptr + offs;
if (ptr >= f->end)
ptr -= f->end - f->buffer;
return *ptr;
}
#endif /* FFMPEG_FIFO_H */
|
