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File Name : bufferqueue.h

/*
 * Generic buffer queue
 * Copyright (c) 2012 Nicolas George
 *
 * 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 AVFILTER_BUFFERQUEUE_H
#define AVFILTER_BUFFERQUEUE_H

/**
 * FFBufQueue: simple AVFilterBufferRef queue API
 *
 * Note: this API is not thread-safe. Concurrent access to the same queue
 * must be protected by a mutex or any synchronization mechanism.
 */

/**
 * Maximum size of the queue.
 *
 * This value can be overridden by definying it before including this
 * header.
 * Powers of 2 are recommended.
 */
#ifndef FF_BUFQUEUE_SIZE
#define FF_BUFQUEUE_SIZE 32
#endif

#include "avfilter.h"
#include "libavutil/avassert.h"

/**
 * Structure holding the queue
 */
struct FFBufQueue {
    AVFilterBufferRef *queue[FF_BUFQUEUE_SIZE];
    unsigned short head;
    unsigned short available; /**< number of available buffers */
};

#define BUCKET(i) queue->queue[(queue->head + (i)) % FF_BUFQUEUE_SIZE]

/**
 * Add a buffer to the queue.
 *
 * If the queue is already full, then the current last buffer is dropped
 * (and unrefed) with a warning before adding the new buffer.
 */
static inline void ff_bufqueue_add(void *log, struct FFBufQueue *queue,
                                   AVFilterBufferRef *buf)
{
    if (queue->available == FF_BUFQUEUE_SIZE) {
        av_log(log, AV_LOG_WARNING, "Buffer queue overflow, dropping.\n");
        avfilter_unref_buffer(BUCKET(--queue->available));
    }
    BUCKET(queue->available++) = buf;
}

/**
 * Get a buffer from the queue without altering it.
 *
 * Buffer with index 0 is the first buffer in the queue.
 * Return NULL if the queue has not enough buffers.
 */
static inline AVFilterBufferRef *ff_bufqueue_peek(struct FFBufQueue *queue,
                                                  unsigned index)
{
    return index < queue->available ? BUCKET(index) : NULL;
}

/**
 * Get the first buffer from the queue and remove it.
 *
 * Do not use on an empty queue.
 */
static inline AVFilterBufferRef *ff_bufqueue_get(struct FFBufQueue *queue)
{
    AVFilterBufferRef *ret = queue->queue[queue->head];
    av_assert0(queue->available);
    queue->available--;
    queue->queue[queue->head] = NULL;
    queue->head = (queue->head + 1) % FF_BUFQUEUE_SIZE;
    return ret;
}

/**
 * Unref and remove all buffers from the queue.
 */
static inline void ff_bufqueue_discard_all(struct FFBufQueue *queue)
{
    while (queue->available)
        avfilter_unref_buffer(ff_bufqueue_get(queue));
}

#undef BUCKET

#endif /* AVFILTER_BUFFERQUEUE_H */

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2012-06-02 06:13:20
..	dir	-	root/root	0755	2012-06-02 06:13:20
libmpcodecs	dir	-	root/root	0755	2012-06-02 06:13:20
x86	dir	-	root/root	0755	2012-06-02 06:13:20
Makefile	text/plain	10.35 KB	root/root	0644	2012-06-02 06:13:20
af_aconvert.c	text/x-asm	6.11 KB	root/root	0644	2012-06-02 06:13:20
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allfilters.c	text/x-c	6.1 KB	root/root	0644	2012-06-02 06:13:20
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avfilter.c	text/x-c	15.43 KB	root/root	0644	2012-06-02 06:13:20
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bufferqueue.h	text/x-c	3.15 KB	root/root	0644	2012-06-02 06:13:20
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internal.h	text/x-c	4.9 KB	root/root	0644	2012-06-02 06:13:20
lavfutils.c	text/x-c	2.96 KB	root/root	0644	2012-06-02 06:13:20
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libavfilter.v	text/plain	114 B	root/root	0644	2012-06-02 06:13:20
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split.c	text/x-asm	4.07 KB	root/root	0644	2012-06-02 06:13:20
src_buffer.c	text/x-c	4.49 KB	root/root	0644	2012-06-02 06:13:20
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vf_settb.c	text/x-asm	4.38 KB	root/root	0644	2012-06-02 06:13:20
vf_showinfo.c	text/x-asm	4.05 KB	root/root	0644	2012-06-02 06:13:20
vf_slicify.c	text/x-asm	3.91 KB	root/root	0644	2012-06-02 06:13:20
vf_super2xsai.c	text/x-c	16.25 KB	root/root	0644	2012-06-02 06:13:20
vf_swapuv.c	text/x-asm	2.82 KB	root/root	0644	2012-06-02 06:13:20
vf_thumbnail.c	text/x-asm	7.96 KB	root/root	0644	2012-06-02 06:13:20
vf_tile.c	text/x-asm	6.34 KB	root/root	0644	2012-06-02 06:13:20
vf_tinterlace.c	text/x-c	13.88 KB	root/root	0644	2012-06-02 06:13:20
vf_transpose.c	text/x-asm	7.57 KB	root/root	0644	2012-06-02 06:13:20
vf_unsharp.c	text/x-c	8.96 KB	root/root	0644	2012-06-02 06:13:20
vf_vflip.c	text/x-asm	3.37 KB	root/root	0644	2012-06-02 06:13:20
vf_yadif.c	text/x-c	14.04 KB	root/root	0644	2012-06-02 06:13:20
video.c	text/x-c	12.69 KB	root/root	0644	2012-06-02 06:13:20
video.h	text/x-c	1.3 KB	root/root	0644	2012-06-02 06:13:20
vsink_nullsink.c	text/x-asm	1.39 KB	root/root	0644	2012-06-02 06:13:20
vsrc_buffer.h	text/x-c	2.04 KB	root/root	0644	2012-06-02 06:13:20
vsrc_cellauto.c	text/x-c	12.07 KB	root/root	0644	2012-06-02 06:13:20
vsrc_color.c	text/x-asm	4.44 KB	root/root	0644	2012-06-02 06:13:20
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yadif.h	text/x-c	1.42 KB	root/root	0644	2012-06-02 06:13:20

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