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443e969293
* commit '27079a426c9d3db918b158976e44b9b143d78e1c': buffer: convert to stdatomic Merged-by: Clément Bœsch <u@pkh.me>
99 lines
2.7 KiB
C
99 lines
2.7 KiB
C
/*
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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 is always treated as read-only.
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*/
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#define BUFFER_FLAG_READONLY (1 << 0)
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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 << 1)
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struct AVBuffer {
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uint8_t *data; /**< data described by this buffer */
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int 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 BUFFER_FLAG_*
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*/
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int flags;
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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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} 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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int size;
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void *opaque;
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AVBufferRef* (*alloc)(int size);
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AVBufferRef* (*alloc2)(void *opaque, int size);
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void (*pool_free)(void *opaque);
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};
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#endif /* AVUTIL_BUFFER_INTERNAL_H */
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