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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_CAPTURE_VIDEO_MAC_PIXEL_BUFFER_POOL_MAC_H_
#define MEDIA_CAPTURE_VIDEO_MAC_PIXEL_BUFFER_POOL_MAC_H_
#import <VideoToolbox/VideoToolbox.h>
#include <memory>
#include "base/mac/scoped_cftyperef.h"
#include "base/optional.h"
#include "media/capture/capture_export.h"
namespace media {
class CAPTURE_EXPORT PixelBufferPool {
public:
// All buffers created by the pool will have the specified properties.
// If specified, the pool allows at most |max_buffers| to exist at a time by
// having CreateBuffer() returns null if this threshold would be exceeded.
//
// If an unsupportd |format| is specified, or the pool cannot be created for
// unknown reasons, null is returned.
static std::unique_ptr<PixelBufferPool> Create(
OSType format,
int width,
int height,
base::Optional<size_t> max_buffers);
~PixelBufferPool();
// Creates a new buffer from the pool, or returns null if |max_buffers_| would
// be exceeded. The underlying buffers may be recycled.
//
// Freeing all buffer references returns the underlying buffer to the pool. In
// order to free memory, you must both release all buffers and call Flush() or
// delete the pool. It is safe for a buffer to outlive its pool.
//
// Retaining a pixel buffer and preventing it from returning to the pool can
// be done either by keeping a reference directly to the CVPixelBuffer, e.g.
// with a base::ScopedCFTypeRef<CVPixelBufferRef>, or by incrementing the use
// count of the IOSurface, i.e. with IOSurfaceIncrementUseCount().
//
// WARNING: Retaining references to the pixel buffer's IOSurface (e.g. with
// base::ScopedCFTypeRef<IOSurfaceRef>) without incrementing its use count
// does NOT prevent it from being recycled!
base::ScopedCFTypeRef<CVPixelBufferRef> CreateBuffer();
// Frees the memory of any released buffers returned to the pool.
void Flush();
private:
friend std::unique_ptr<PixelBufferPool> std::make_unique<PixelBufferPool>(
base::ScopedCFTypeRef<CVPixelBufferPoolRef>&& buffer_pool,
base::Optional<size_t>&& max_buffers);
PixelBufferPool(base::ScopedCFTypeRef<CVPixelBufferPoolRef> buffer_pool,
base::Optional<size_t> max_buffers);
base::ScopedCFTypeRef<CVPixelBufferPoolRef> buffer_pool_;
const base::Optional<size_t> max_buffers_;
};
} // namespace media
#endif // MEDIA_CAPTURE_VIDEO_MAC_PIXEL_BUFFER_POOL_MAC_H_
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