Adding pulseaudio input support to chrome

media/audio/pulse/pulse_util.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_PULSE_PULSE_UTIL_H_
+#define MEDIA_AUDIO_PULSE_PULSE_UTIL_H_
+
+#include <pulse/pulseaudio.h>
+
+#include "base/basictypes.h"
+#include "media/audio/audio_device_name.h"
+//#include "media/audio/pulse/pulse_wrapper.h"
+#include "media/base/channel_layout.h"
+
+namespace media {
+
+class PulseWrapper;
+
+// A helper class that acquires pa_threaded_mainloop_lock() while in scope.
+class AutoPulseLock {
+ public:
+  AutoPulseLock(PulseWrapper* wrapper, pa_threaded_mainloop* pa_mainloop);
+  ~AutoPulseLock();
+
+ private:
+  PulseWrapper* wrapper_;
+  pa_threaded_mainloop* pa_mainloop_;
+  DISALLOW_COPY_AND_ASSIGN(AutoPulseLock);
+};
+
+pa_sample_format_t BitsToPASampleFormat(PulseWrapper* wrapper,
+                                        int bits_per_sample);
+
+pa_channel_map ChannelLayoutToPAChannelMap(PulseWrapper* wrapper,
+                                           ChannelLayout channel_layout);
+
+void WaitForOperationCompletion(PulseWrapper* wrapper,
+                                pa_threaded_mainloop* pa_mainloop,
+                                pa_operation* operation);
+
+int GetHardwareLatencyInBytes(PulseWrapper* wrapper,
+                              pa_stream* stream,
+                              int sample_rate,
+                              int bytes_per_frame);
+
+}  // namespace media
+
+#endif  // MEDIA_AUDIO_PULSE_PULSE_UTIL_H_