2 * This file is part of FFmpeg.
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.
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.
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
21 * A very simple circular buffer FIFO implementation.
27 typedef struct AVFifoBuffer {
29 uint8_t *rptr, *wptr, *end;
33 * Initializes an AVFifoBuffer.
34 * @param *f AVFifoBuffer to initialize
36 * @return <0 for failure >=0 otherwise
38 int av_fifo_init(AVFifoBuffer *f, int size);
41 * Frees an AVFifoBuffer.
42 * @param *f AVFifoBuffer to free
44 void av_fifo_free(AVFifoBuffer *f);
47 * Returns the amount of data in bytes in the AVFifoBuffer, that is the
48 * amount of data you can read from it.
49 * @param *f AVFifoBuffer to read from
52 int av_fifo_size(AVFifoBuffer *f);
55 * Reads data from an AVFifoBuffer.
56 * @param *f AVFifoBuffer to read from
57 * @param *buf data destination
58 * @param buf_size number of bytes to read
60 int av_fifo_read(AVFifoBuffer *f, uint8_t *buf, int buf_size);
63 * Feeds data from an AVFifoBuffer to a user supplied callback.
64 * @param *f AVFifoBuffer to read from
65 * @param buf_size number of bytes to read
66 * @param *func generic read function
67 * @param *dest data destination
69 int av_fifo_generic_read(AVFifoBuffer *f, int buf_size, void (*func)(void*, void*, int), void* dest);
72 * Writes data into an AVFifoBuffer.
73 * @param *f AVFifoBuffer to write to
74 * @param *buf data source
75 * @param size data size
77 void av_fifo_write(AVFifoBuffer *f, const uint8_t *buf, int size);
80 * Resizes an AVFifoBuffer.
81 * @param *f AVFifoBuffer to resize
82 * @param size new AVFifoBuffer size in bytes
84 void av_fifo_realloc(AVFifoBuffer *f, unsigned int size);
87 * Reads and discards the specified amount of data from an AVFifoBuffer.
88 * @param *f AVFifoBuffer to read from
89 * @param size amount of data to read in bytes
91 void av_fifo_drain(AVFifoBuffer *f, int size);
93 static inline uint8_t av_fifo_peek(AVFifoBuffer *f, int offs)
95 uint8_t *ptr = f->rptr + offs;
97 ptr -= f->end - f->buffer;