fifo.h
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1 /*
2  * This file is part of Libav.
3  *
4  * Libav is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * Libav is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with Libav; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
24 #ifndef AVUTIL_FIFO_H
25 #define AVUTIL_FIFO_H
26 
27 #include <stdint.h>
28 #include "avutil.h"
29 
30 typedef struct AVFifoBuffer {
31  uint8_t *buffer;
32  uint8_t *rptr, *wptr, *end;
33  uint32_t rndx, wndx;
34 } AVFifoBuffer;
35 
41 AVFifoBuffer *av_fifo_alloc(unsigned int size);
42 
48 
54 
62 
70 
78 int av_fifo_generic_read(AVFifoBuffer *f, void *dest, int buf_size, void (*func)(void*, void*, int));
79 
93 int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size, int (*func)(void*, void*, int));
94 
101 int av_fifo_realloc2(AVFifoBuffer *f, unsigned int size);
102 
108 void av_fifo_drain(AVFifoBuffer *f, int size);
109 
120 static inline uint8_t *av_fifo_peek2(const AVFifoBuffer *f, int offs)
121 {
122  uint8_t *ptr = f->rptr + offs;
123  if (ptr >= f->end)
124  ptr = f->buffer + (ptr - f->end);
125  else if (ptr < f->buffer)
126  ptr = f->end - (f->buffer - ptr);
127  return ptr;
128 }
129 
130 #if FF_API_AV_FIFO_PEEK
131 
135 static inline uint8_t av_fifo_peek(AVFifoBuffer *f, int offs)
136 {
137  return *av_fifo_peek2(f, offs);
138 }
139 #endif
140 
141 #endif /* AVUTIL_FIFO_H */