Avoids irregular OnMoreData callbacks on Windows using Core Audio

media/audio/win/audio_unified_win.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_WIN_AUDIO_UNIFIED_WIN_H_
 #define MEDIA_AUDIO_WIN_AUDIO_UNIFIED_WIN_H_
 
 #include <Audioclient.h>
 #include <MMDeviceAPI.h>
 
@@ skipping 99 matching lines @@
   scoped_ptr<base::DelegateSimpleThread> audio_io_thread_;
 
   // Contains the desired audio format which is set up at construction.
   // Extended PCM waveform format structure based on WAVEFORMATEXTENSIBLE.
   // Use this for multiple channel and hi-resolution PCM data.
   WAVEFORMATPCMEX format_;
 
   // True when successfully opened.
   bool opened_;
 
+  // Volume level from 0 to 1.
+  float volume_;

[tommi (sloooow) - chröme, 2013/02/01 11:57:53]

use double

[henrika (OOO until Aug 14), 2013/02/01 12:23:52]

Done.

+
   // Size in bytes of each audio frame (4 bytes for 16-bit stereo PCM).
   size_t frame_size_;
 
   // Size in audio frames of each audio packet where an audio packet
   // is defined as the block of data which the source is expected to deliver
   // in each OnMoreIOData() callback.
   size_t packet_size_frames_;
 
   // Length of the audio endpoint buffer.
   size_t endpoint_render_buffer_size_frames_;
@@ skipping 40 matching lines @@
 
   // Container for sending data to AudioSourceCallback::OnMoreIOData().
   scoped_ptr<AudioBus> capture_bus_;
 
   DISALLOW_COPY_AND_ASSIGN(WASAPIUnifiedStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_WIN_AUDIO_UNIFIED_WIN_H_