FFmpeg
libavutil
buffer_internal.h
Go to the documentation of this file.
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/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_BUFFER_INTERNAL_H
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#define AVUTIL_BUFFER_INTERNAL_H
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#include <stdatomic.h>
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#include <stdint.h>
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#include "
buffer.h
"
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#include "
thread.h
"
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/**
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* The buffer was av_realloc()ed, so it is reallocatable.
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*/
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#define BUFFER_FLAG_REALLOCATABLE (1 << 0)
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/**
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* The AVBuffer structure is part of a larger structure
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* and should not be freed.
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*/
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#define BUFFER_FLAG_NO_FREE (1 << 1)
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struct
AVBuffer
{
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uint8_t *
data
;
/**< data described by this buffer */
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size_t
size
;
/**< size of data in bytes */
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/**
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* number of existing AVBufferRef instances referring to this buffer
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*/
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atomic_uint
refcount
;
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/**
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* a callback for freeing the data
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*/
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void (*
free
)(
void
*
opaque
, uint8_t *
data
);
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/**
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* an opaque pointer, to be used by the freeing callback
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*/
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void
*
opaque
;
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/**
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* A combination of AV_BUFFER_FLAG_*
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*/
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int
flags
;
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/**
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* A combination of BUFFER_FLAG_*
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*/
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int
flags_internal
;
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};
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typedef
struct
BufferPoolEntry
{
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uint8_t *
data
;
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/*
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* Backups of the original opaque/free of the AVBuffer corresponding to
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* data. They will be used to free the buffer when the pool is freed.
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*/
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void
*
opaque
;
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void (*
free
)(
void
*
opaque
, uint8_t *
data
);
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AVBufferPool
*
pool
;
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struct
BufferPoolEntry
*
next
;
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/*
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* An AVBuffer structure to (re)use as AVBuffer for subsequent uses
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* of this BufferPoolEntry.
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*/
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AVBuffer
buffer
;
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}
BufferPoolEntry
;
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struct
AVBufferPool
{
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AVMutex
mutex
;
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BufferPoolEntry
*
pool
;
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/*
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* This is used to track when the pool is to be freed.
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* The pointer to the pool itself held by the caller is considered to
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* be one reference. Each buffer requested by the caller increases refcount
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* by one, returning the buffer to the pool decreases it by one.
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* refcount reaches zero when the buffer has been uninited AND all the
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* buffers have been released, then it's safe to free the pool and all
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* the buffers in it.
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*/
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atomic_uint
refcount
;
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size_t
size
;
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void
*
opaque
;
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AVBufferRef
* (*alloc)(
size_t
size
);
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AVBufferRef
* (*alloc2)(
void
*
opaque
,
size_t
size
);
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void (*
pool_free
)(
void
*
opaque
);
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};
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#endif
/* AVUTIL_BUFFER_INTERNAL_H */
AVBufferPool::mutex
AVMutex mutex
Definition:
buffer_internal.h:89
AVBufferPool
The buffer pool.
Definition:
buffer_internal.h:88
thread.h
AVBufferPool::size
size_t size
Definition:
buffer_internal.h:103
BufferPoolEntry::data
uint8_t * data
Definition:
buffer_internal.h:69
AVBufferPool::refcount
atomic_uint refcount
Definition:
buffer_internal.h:101
AVBuffer::flags
int flags
A combination of AV_BUFFER_FLAG_*.
Definition:
buffer_internal.h:60
AVBufferPool::opaque
void * opaque
Definition:
buffer_internal.h:104
AVMutex
#define AVMutex
Definition:
thread.h:184
BufferPoolEntry::pool
AVBufferPool * pool
Definition:
buffer_internal.h:78
AVBuffer::free
void(* free)(void *opaque, uint8_t *data)
a callback for freeing the data
Definition:
buffer_internal.h:50
BufferPoolEntry::buffer
AVBuffer buffer
Definition:
buffer_internal.h:85
AVBuffer::size
size_t size
size of data in bytes
Definition:
buffer_internal.h:40
AVBuffer::flags_internal
int flags_internal
A combination of BUFFER_FLAG_*.
Definition:
buffer_internal.h:65
AVBuffer::opaque
void * opaque
an opaque pointer, to be used by the freeing callback
Definition:
buffer_internal.h:55
AVBufferPool::pool_free
void(* pool_free)(void *opaque)
Definition:
buffer_internal.h:107
AVBuffer::data
uint8_t * data
data described by this buffer
Definition:
buffer_internal.h:39
BufferPoolEntry::free
void(* free)(void *opaque, uint8_t *data)
Definition:
buffer_internal.h:76
BufferPoolEntry
Definition:
buffer_internal.h:68
buffer.h
BufferPoolEntry::opaque
void * opaque
Definition:
buffer_internal.h:75
AVBuffer
A reference counted buffer type.
Definition:
buffer_internal.h:38
AVBufferPool::pool
BufferPoolEntry * pool
Definition:
buffer_internal.h:90
BufferPoolEntry::next
struct BufferPoolEntry * next
Definition:
buffer_internal.h:79
atomic_uint
intptr_t atomic_uint
Definition:
stdatomic.h:56
AVBufferRef
A reference to a data buffer.
Definition:
buffer.h:82
AVBuffer::refcount
atomic_uint refcount
number of existing AVBufferRef instances referring to this buffer
Definition:
buffer_internal.h:45
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