libavutil/fifo.h

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/*
 * 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
 */

#ifndef AVUTIL_FIFO_H
#define AVUTIL_FIFO_H

#include <stdint.h>
#include "avutil.h"

typedef struct AVFifoBuffer {
    uint8_t *buffer;
    uint8_t *rptr, *wptr, *end;
    uint32_t rndx, wndx;
} AVFifoBuffer;

AVFifoBuffer *av_fifo_alloc(unsigned int size);

void av_fifo_free(AVFifoBuffer *f);

void av_fifo_reset(AVFifoBuffer *f);

int av_fifo_size(AVFifoBuffer *f);

int av_fifo_space(AVFifoBuffer *f);

int av_fifo_generic_read(AVFifoBuffer *f, void *dest, int buf_size, void (*func)(void*, void*, int));

int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size, int (*func)(void*, void*, int));

int av_fifo_realloc2(AVFifoBuffer *f, unsigned int size);

int av_fifo_grow(AVFifoBuffer *f, unsigned int additional_space);

void av_fifo_drain(AVFifoBuffer *f, int size);

static inline uint8_t *av_fifo_peek2(const AVFifoBuffer *f, int offs)
{
    uint8_t *ptr = f->rptr + offs;
    if (ptr >= f->end)
        ptr = f->buffer + (ptr - f->end);
    else if (ptr < f->buffer)
        ptr = f->end - (f->buffer - ptr);
    return ptr;
}

#if FF_API_AV_FIFO_PEEK

attribute_deprecated
static inline uint8_t av_fifo_peek(AVFifoBuffer *f, int offs)
{
    return *av_fifo_peek2(f, offs);
}
#endif

#endif /* AVUTIL_FIFO_H */

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