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/base/channel_layout.h"
+
+namespace media {
+

[DaleCurtis, 2013/02/20 00:17:38]

WDYT about putting these in a pulse sub-namespace under media?  I.e.
media::pulse::() or a class similar to henrika's CoreAudioUtil?

[no longer working on chromium, 2013/02/20 14:43:38]

Done with adding the media::pulse namespace

+// A helper class that acquires pa_threaded_mainloop_lock() while in scope.
+class AutoPulseLock {

[DaleCurtis, 2013/02/20 00:17:38]

Just inline the implementation like base/lock.h

[no longer working on chromium, 2013/02/20 14:43:38]

Done.

+ public:
+  explicit AutoPulseLock(pa_threaded_mainloop* pa_mainloop);
+  ~AutoPulseLock();
+
+ private:
+  pa_threaded_mainloop* pa_mainloop_;
+  DISALLOW_COPY_AND_ASSIGN(AutoPulseLock);
+};
+
+// Triggers pa_threaded_mainloop_signal() to avoid deadlocks.
+void StreamSuccessCallback(pa_stream* s, int error, void* mainloop);
+void ContextStateCallback(pa_context* context, void* mainloop);
+
+pa_sample_format_t BitsToPASampleFormat(int bits_per_sample);
+
+pa_channel_map ChannelLayoutToPAChannelMap(ChannelLayout channel_layout);
+
+void WaitForOperationCompletion(pa_threaded_mainloop* pa_mainloop,
+                                pa_operation* operation);
+
+int GetHardwareLatencyInBytes(pa_stream* stream,
+                              int sample_rate,
+                              int bytes_per_frame);
+
+}  // namespace media
+
+#endif  // MEDIA_AUDIO_PULSE_PULSE_UTIL_H_