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Stefan Westerfeld
ffmpeg
Commits
6d679c43
Commit
6d679c43
authored
Apr 24, 2012
by
Nicolas George
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lavfi: add a generic API for buffer queues.
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72f3786d
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bufferqueue.h
libavfilter/bufferqueue.h
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libavfilter/bufferqueue.h
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6d679c43
/*
* 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 */
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