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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_BUFFER_INTERNAL_H
+#define AVUTIL_BUFFER_INTERNAL_H
+
+#include <stdatomic.h>
+#include <stdint.h>
+
+#include "buffer.h"
+#include "thread.h"
+
+/**
+ * The buffer was av_realloc()ed, so it is reallocatable.
+ */
+#define BUFFER_FLAG_REALLOCATABLE (1 << 0)
+/**
+ * The AVBuffer structure is part of a larger structure
+ * and should not be freed.
+ */
+#define BUFFER_FLAG_NO_FREE (1 << 1)
+
+struct AVBuffer {
+ uint8_t *data; /**< data described by this buffer */
+ size_t size; /**< size of data in bytes */
+
+ /**
+ * number of existing AVBufferRef instances referring to this buffer
+ */
+ atomic_uint refcount;
+
+ /**
+ * a callback for freeing the data
+ */
+ void (*free)(void *opaque, uint8_t *data);
+
+ /**
+ * an opaque pointer, to be used by the freeing callback
+ */
+ void *opaque;
+
+ /**
+ * A combination of AV_BUFFER_FLAG_*
+ */
+ int flags;
+
+ /**
+ * A combination of BUFFER_FLAG_*
+ */
+ int flags_internal;
+};
+
+typedef struct BufferPoolEntry {
+ uint8_t *data;
+
+ /*
+ * Backups of the original opaque/free of the AVBuffer corresponding to
+ * data. They will be used to free the buffer when the pool is freed.
+ */
+ void *opaque;
+ void (*free)(void *opaque, uint8_t *data);
+
+ AVBufferPool *pool;
+ struct BufferPoolEntry *next;
+
+ /*
+ * An AVBuffer structure to (re)use as AVBuffer for subsequent uses
+ * of this BufferPoolEntry.
+ */
+ AVBuffer buffer;
+} BufferPoolEntry;
+
+struct AVBufferPool {
+ AVMutex mutex;
+ BufferPoolEntry *pool;
+
+ /*
+ * This is used to track when the pool is to be freed.
+ * The pointer to the pool itself held by the caller is considered to
+ * be one reference. Each buffer requested by the caller increases refcount
+ * by one, returning the buffer to the pool decreases it by one.
+ * refcount reaches zero when the buffer has been uninited AND all the
+ * buffers have been released, then it's safe to free the pool and all
+ * the buffers in it.
+ */
+ atomic_uint refcount;
+
+ size_t size;
+ void *opaque;
+ AVBufferRef* (*alloc)(size_t size);
+ AVBufferRef* (*alloc2)(void *opaque, size_t size);
+ void (*pool_free)(void *opaque);
+};
+
+#endif /* AVUTIL_BUFFER_INTERNAL_H */