Extract nested and private classes from VideoCaptureBufferPool

content/browser/renderer_host/media/video_capture_buffer_tracker.h

+// Copyright 2016 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 CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_BUFFER_TRACKER_H_
+#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_BUFFER_TRACKER_H_
+
+#include <memory>
+
+#include "base/synchronization/lock.h"
+#include "content/browser/renderer_host/media/video_capture_buffer_handle.h"
+#include "media/base/video_capture_types.h"
+
+namespace content {
+
+// Keeps track of the state of a given mappable resource. Each
+// VideoCaptureBufferTracker carries indication of pixel format and storage
+// type. This is a base class for implementations using different kinds of
+// storage.
+class VideoCaptureBufferTracker {
+ public:
+  VideoCaptureBufferTracker()
+      : max_pixel_count_(0),
+        held_by_producer_(false),
+        consumer_hold_count_(0) {}
+  virtual bool Init(const gfx::Size& dimensions,
+                    media::VideoPixelFormat format,
+                    media::VideoPixelStorage storage_type,
+                    base::Lock* lock) = 0;
+  virtual ~VideoCaptureBufferTracker(){};
+
+  const gfx::Size& dimensions() const { return dimensions_; }
+  void set_dimensions(const gfx::Size& dim) { dimensions_ = dim; }
+  size_t max_pixel_count() const { return max_pixel_count_; }
+  void set_max_pixel_count(size_t count) { max_pixel_count_ = count; }
+  media::VideoPixelFormat pixel_format() const { return pixel_format_; }
+  void set_pixel_format(media::VideoPixelFormat format) {
+    pixel_format_ = format;
+  }
+  media::VideoPixelStorage storage_type() const { return storage_type_; }
+  void set_storage_type(media::VideoPixelStorage storage_type) {
+    storage_type_ = storage_type;
+  }
+  bool held_by_producer() const { return held_by_producer_; }
+  void set_held_by_producer(bool value) { held_by_producer_ = value; }
+  int consumer_hold_count() const { return consumer_hold_count_; }
+  void set_consumer_hold_count(int value) { consumer_hold_count_ = value; }
+
+  // Returns a handle to the underlying storage, be that a block of Shared
+  // Memory, or a GpuMemoryBuffer.
+  virtual std::unique_ptr<VideoCaptureBufferHandle> GetBufferHandle() = 0;
+
+  virtual bool ShareToProcess(base::ProcessHandle process_handle,
+                              base::SharedMemoryHandle* new_handle) = 0;
+  virtual bool ShareToProcess2(int plane,
+                               base::ProcessHandle process_handle,
+                               gfx::GpuMemoryBufferHandle* new_handle) = 0;
+
+ private:
+  // |dimensions_| may change as a VideoCaptureBufferTracker is re-used, but
+  // |max_pixel_count_|, |pixel_format_|, and |storage_type_| are set once for
+  // the lifetime of a VideoCaptureBufferTracker.
+  gfx::Size dimensions_;
+  size_t max_pixel_count_;
+  media::VideoPixelFormat pixel_format_;
+  media::VideoPixelStorage storage_type_;
+
+  // Indicates whether this VideoCaptureBufferTracker is currently referenced by
+  // the producer.
+  bool held_by_producer_;
+
+  // Number of consumer processes which hold this VideoCaptureBufferTracker.
+  int consumer_hold_count_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_BUFFER_TRACKER_H_