media/base/bitstream_buffer.h

   1 // Copyright (c) 2011 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 MEDIA_BASE_BITSTREAM_BUFFER_H_
   6 #define MEDIA_BASE_BITSTREAM_BUFFER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/shared_memory.h"
  10 #include "base/time/time.h"
  11 #include "media/base/timestamp_constants.h"
  12
  13 namespace media {
  14
  15 // Class for passing bitstream buffers around.  Does not take ownership of the
  16 // data.  This is the media-namespace equivalent of PP_VideoBitstreamBuffer_Dev.
  17 class BitstreamBuffer {
  18  public:
  19   BitstreamBuffer(int32 id, base::SharedMemoryHandle handle, size_t size)
  20       : id_(id),
  21         handle_(handle),
  22         size_(size),
  23         presentation_timestamp_(kNoTimestamp()) {}
  24
  25   BitstreamBuffer(int32 id,
  26                   base::SharedMemoryHandle handle,
  27                   size_t size,
  28                   base::TimeDelta presentation_timestamp)
  29       : id_(id),
  30         handle_(handle),
  31         size_(size),
  32         presentation_timestamp_(presentation_timestamp) {}
  33
  34   int32 id() const { return id_; }
  35   base::SharedMemoryHandle handle() const { return handle_; }
  36   size_t size() const { return size_; }
  37
  38   // The timestamp is only valid if it's not equal to |media::kNoTimestamp()|.
  39   base::TimeDelta presentation_timestamp() const {
  40     return presentation_timestamp_;
  41   }
  42
  43  private:
  44   int32 id_;
  45   base::SharedMemoryHandle handle_;
  46   size_t size_;
  47
  48   // This is only set when necessary. For example, AndroidVideoDecodeAccelerator
  49   // needs the timestamp because the underlying decoder may require it to
  50   // determine the output order.
  51   base::TimeDelta presentation_timestamp_;
  52
  53   // Allow compiler-generated copy & assign constructors.
  54 };
  55
  56 }  // namespace media
  57
  58 #endif  // MEDIA_BASE_BITSTREAM_BUFFER_H_