Add allocator interface for use by cdm_adapter

media/cdm/cdm_buffer_allocator.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 MEDIA_CDM_CDM_BUFFER_ALLOCATOR_H_
+#define MEDIA_CDM_CDM_BUFFER_ALLOCATOR_H_
+
+#include <stdint.h>
+
+#include "base/macros.h"
+#include "media/base/media_export.h"
+
+namespace media {
+
+class CdmBuffer;
+
+class MEDIA_EXPORT CdmBufferAllocator {
+ public:
+  // Allocates a buffer with at least |capacity| bytes.
+  virtual CdmBuffer* Allocate(uint32_t capacity) = 0;
+
+  // Releases the buffer with |buffer_id|. A buffer can be recycled after
+  // it is released.
+  virtual void Release(uint32_t buffer_id) = 0;

[xhwang, 2016/02/09 18:27:32]

What is a |buffer_id|? How do we get it? It's not available from Allocate().

[jrummell, 2016/02/11 01:39:38]

Fixed so that it uses the same object as Allocate() returns.

+
+ protected:
+  CdmBufferAllocator();
+  virtual ~CdmBufferAllocator();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CdmBufferAllocator);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_CDM_CDM_BUFFER_ALLOCATOR_H_