AudioSharedBuffer

media/audio/audio_parameters.h

 // Copyright (c) 2012 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_AUDIO_AUDIO_PARAMETERS_H_
 #define MEDIA_AUDIO_AUDIO_PARAMETERS_H_
 
 #include "base/basictypes.h"
 #include "base/time/time.h"
 #include "media/base/channel_layout.h"
 #include "media/base/media_export.h"
 
 namespace media {
 
 struct MEDIA_EXPORT AudioInputBufferParameters {
   double volume;
   uint32 size;
   bool key_pressed;
 };
 
 // Use a struct-in-struct approach to ensure that we can calculate the required
 // size as sizeof(AudioInputBufferParameters) + #(bytes in audio buffer) without
 // using packing.
 struct MEDIA_EXPORT AudioInputBuffer {
   AudioInputBufferParameters params;
   int8 audio[1];
 };
 
+// Used for audio buffer exchange in shared memory between processes with
+// buffer_index counting for synchronization without needing to block.
+struct MEDIA_EXPORT AudioSharedBuffer {
+  uint32 buffer_index;
+  int8 audio[1];
+};
+
 class MEDIA_EXPORT AudioParameters {
  public:
   // TODO(miu): Rename this enum to something that correctly reflects its
   // semantics, such as "TransportScheme."
   enum Format {
     AUDIO_PCM_LINEAR = 0,     // PCM is 'raw' amplitude samples.
     AUDIO_PCM_LOW_LATENCY,    // Linear PCM, low latency requested.
     AUDIO_FAKE,               // Creates a fake AudioOutputStream object.
     AUDIO_LAST_FORMAT         // Only used for validation of format.
   };
@@ skipping 88 matching lines @@
   if (a.sample_rate() != b.sample_rate())
     return a.sample_rate() < b.sample_rate();
   if (a.bits_per_sample() != b.bits_per_sample())
     return a.bits_per_sample() < b.bits_per_sample();
   return a.frames_per_buffer() < b.frames_per_buffer();
 }
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_PARAMETERS_H_