chromecast/media/cma/ipc/media_memory_chunk.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROMECAST_MEDIA_CMA_IPC_MEDIA_MEMORY_CHUNK_H_
   6 #define CHROMECAST_MEDIA_CMA_IPC_MEDIA_MEMORY_CHUNK_H_
   7
   8 #include "base/basictypes.h"
   9
  10 namespace chromecast {
  11 namespace media {
  12
  13 // MediaMemoryChunk represents a block of memory without doing any assumption
  14 // about the type of memory (e.g. shared memory) nor about the underlying
  15 // memory ownership.
  16 // The block of memory can be invalidated under the cover (e.g. if the derived
  17 // class does not own the underlying memory),
  18 // in that case, MediaMemoryChunk::valid() will return false.
  19 class MediaMemoryChunk {
  20  public:
  21   virtual ~MediaMemoryChunk();
  22
  23   // Returns the start of the block of memory.
  24   virtual void* data() const = 0;
  25
  26   // Returns the size of the block of memory.
  27   virtual size_t size() const = 0;
  28
  29   // Returns whether the underlying block of memory is valid.
  30   // Since MediaMemoryChunk does not specify a memory ownership model,
  31   // the underlying block of memory might be invalidated by a third party.
  32   // In that case, valid() will return false.
  33   virtual bool valid() const = 0;
  34 };
  35
  36 }  // namespace media
  37 }  // namespace chromecast
  38
  39 #endif  // CHROMECAST_MEDIA_CMA_IPC_MEDIA_MEMORY_CHUNK_H_