FFmpeg  1.2.12
fifo.h
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 #include "attributes.h"
30 
31 typedef struct AVFifoBuffer {
32  uint8_t *buffer;
33  uint8_t *rptr, *wptr, *end;
34  uint32_t rndx, wndx;
35 } AVFifoBuffer;
36 
42 AVFifoBuffer *av_fifo_alloc(unsigned int size);
43 
48 void av_fifo_free(AVFifoBuffer *f);
49 
55 
63 
71 
79 int av_fifo_generic_read(AVFifoBuffer *f, void *dest, int buf_size, void (*func)(void*, void*, int));
80 
94 int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size, int (*func)(void*, void*, int));
95 
104 int av_fifo_realloc2(AVFifoBuffer *f, unsigned int size);
105 
115 int av_fifo_grow(AVFifoBuffer *f, unsigned int additional_space);
116 
122 void av_fifo_drain(AVFifoBuffer *f, int size);
123 
134 static inline uint8_t *av_fifo_peek2(const AVFifoBuffer *f, int offs)
135 {
136  uint8_t *ptr = f->rptr + offs;
137  if (ptr >= f->end)
138  ptr = f->buffer + (ptr - f->end);
139  else if (ptr < f->buffer)
140  ptr = f->end - (f->buffer - ptr);
141  return ptr;
142 }
143 
144 #endif /* AVUTIL_FIFO_H */