Low-latency AudioInputStream implementation based on WASAPI for Windows.

media/audio/audio_util.h

 // Copyright (c) 2011 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_UTIL_H_
 #define MEDIA_AUDIO_AUDIO_UTIL_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 61 matching lines @@
 // InterleaveFloatToInt16 scales, clips, and interleaves the planar
 // floating-point audio contained in |source| to the int16 |destination|.
 // The floating-point data is in a canonical range of -1.0 -> +1.0.
 // The size of the |source| vector determines the number of channels.
 // The |destination| buffer is assumed to be large enough to hold the
 // result. Thus it must be at least size: number_of_frames * source.size()
 MEDIA_EXPORT void InterleaveFloatToInt16(const std::vector<float*>& source,
                                          int16* destination,
                                          size_t number_of_frames);
 
-// Returns the default audio hardware sample-rate.
+// Returns the default audio input hardware sample-rate.

[Chris Rogers, 2011/10/19 00:55:18]

comment is backwards:
should be "audio output"

[henrika (OOO until Aug 14), 2011/10/19 15:42:43]

Thanks!

 MEDIA_EXPORT double GetAudioHardwareSampleRate();
 
+// Returns the default audio output hardware sample-rate.

[Chris Rogers, 2011/10/19 00:55:18]

should be "audio input"

[henrika (OOO until Aug 14), 2011/10/19 15:42:43]

Done.

+MEDIA_EXPORT double GetAudioInputHardwareSampleRate();
+
 // Returns the optimal low-latency buffer size for the audio hardware.
 // This is the smallest buffer size the system can comfortably render
 // at without glitches.  The buffer size is in sample-frames.
 MEDIA_EXPORT size_t GetAudioHardwareBufferSize();
 
 // Functions that handle data buffer passed between processes in the shared
 // memory. Called on both IPC sides.
 
 MEDIA_EXPORT uint32 TotalSharedMemorySizeInBytes(uint32 packet_size);
 MEDIA_EXPORT uint32 PacketSizeSizeInBytes(uint32 shared_memory_created_size);
 MEDIA_EXPORT uint32 GetActualDataSizeInBytes(base::SharedMemory* shared_memory,
                                              uint32 shared_memory_size);
 MEDIA_EXPORT void SetActualDataSizeInBytes(base::SharedMemory* shared_memory,
                                            uint32 shared_memory_size,
                                            uint32 actual_data_size);
 MEDIA_EXPORT void SetUnknownDataSize(base::SharedMemory* shared_memory,
                                      uint32 shared_memory_size);
 MEDIA_EXPORT bool IsUnknownDataSize(base::SharedMemory* shared_memory,
                                     uint32 shared_memory_size);
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_UTIL_H_