mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-13 18:55:08 +00:00
1faf7dc807
dujardin.iut numericable fr with some further changes by me. Originally committed as revision 8151 to svn://svn.ffmpeg.org/ffmpeg/trunk
108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
/*
|
|
* 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 FIFO_H
|
|
#define FIFO_H
|
|
|
|
typedef struct AVFifoBuffer {
|
|
uint8_t *buffer;
|
|
uint8_t *rptr, *wptr, *end;
|
|
} AVFifoBuffer;
|
|
|
|
/**
|
|
* Initializes a FIFO *.
|
|
* @param *f FIFO buffer
|
|
* @param size of FIFO
|
|
* @return <0 for failure >=0 otherwise
|
|
*/
|
|
int av_fifo_init(AVFifoBuffer *f, int size);
|
|
|
|
/**
|
|
* Frees a FIFO *.
|
|
* @param *f FIFO buffer
|
|
*/
|
|
void av_fifo_free(AVFifoBuffer *f);
|
|
|
|
/**
|
|
* Returns the size of a FIFO *.
|
|
* @param *f FIFO buffer
|
|
* @return size
|
|
*/
|
|
int av_fifo_size(AVFifoBuffer *f);
|
|
|
|
/**
|
|
* Reads the data from the FIFO *.
|
|
* @param *f FIFO buffer
|
|
* @param *buf data destination
|
|
* @param buf_size data size
|
|
* @return -1 if not enough data
|
|
*/
|
|
int av_fifo_read(AVFifoBuffer *f, uint8_t *buf, int buf_size);
|
|
|
|
/**
|
|
* Reads the data from the FIFO *.
|
|
* @param *f FIFO buffer
|
|
* @param buf_size data size
|
|
* @param *func generic read function
|
|
* @param *dest data destination
|
|
* @return -1 if not enough data
|
|
*/
|
|
int av_fifo_generic_read(AVFifoBuffer *f, int buf_size, void (*func)(void*, void*, int), void* dest);
|
|
|
|
/**
|
|
* Writes the data in the FIFO *.
|
|
* @param *f FIFO buffer
|
|
* @param *buf data source
|
|
* @param size data size
|
|
*/
|
|
void av_fifo_write(AVFifoBuffer *f, const uint8_t *buf, int size);
|
|
|
|
/**
|
|
* Resizes the FIFO *.
|
|
* @param *f FIFO buffer
|
|
* @param size data size
|
|
*/
|
|
void av_fifo_realloc(AVFifoBuffer *f, unsigned int size);
|
|
|
|
/**
|
|
* Discards the data from the FIFO *.
|
|
* @param *f FIFO buffer
|
|
* @param size data size
|
|
*/
|
|
void av_fifo_drain(AVFifoBuffer *f, int size);
|
|
|
|
/**
|
|
* Returns a pointer with circular offset from FIFO's read pointer.
|
|
* @param *f FIFO buffer
|
|
* @param offs offset
|
|
* @return ptr=rptr+offs if rptr+offs<end else rptr+offs -(end-begin)
|
|
*/
|
|
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 /* FIFO_H */
|