Upstream version 5.34.104.0
[platform/framework/web/crosswalk.git] / src / media / audio / pulse / pulse_util.h
1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef MEDIA_AUDIO_PULSE_PULSE_UTIL_H_
6 #define MEDIA_AUDIO_PULSE_PULSE_UTIL_H_
7
8 #include <pulse/pulseaudio.h>
9
10 #include "base/basictypes.h"
11 #include "media/audio/audio_device_name.h"
12 #include "media/base/channel_layout.h"
13
14 namespace media {
15
16 class AudioParameters;
17
18 namespace pulse {
19
20 // A helper class that acquires pa_threaded_mainloop_lock() while in scope.
21 class AutoPulseLock {
22  public:
23   explicit AutoPulseLock(pa_threaded_mainloop* pa_mainloop)
24       : pa_mainloop_(pa_mainloop) {
25     pa_threaded_mainloop_lock(pa_mainloop_);
26   }
27
28   ~AutoPulseLock() {
29     pa_threaded_mainloop_unlock(pa_mainloop_);
30   }
31
32  private:
33   pa_threaded_mainloop* pa_mainloop_;
34   DISALLOW_COPY_AND_ASSIGN(AutoPulseLock);
35 };
36
37 // Triggers pa_threaded_mainloop_signal() to avoid deadlocks.
38 void StreamSuccessCallback(pa_stream* s, int error, void* mainloop);
39 void ContextStateCallback(pa_context* context, void* mainloop);
40
41 pa_sample_format_t BitsToPASampleFormat(int bits_per_sample);
42
43 pa_channel_map ChannelLayoutToPAChannelMap(ChannelLayout channel_layout);
44
45 void WaitForOperationCompletion(pa_threaded_mainloop* mainloop,
46                                 pa_operation* operation);
47
48 int GetHardwareLatencyInBytes(pa_stream* stream,
49                               int sample_rate,
50                               int bytes_per_frame);
51
52 // Create a recording stream for the threaded mainloop, return true if success,
53 // otherwise false. |mainloop| and |context| have to be from a valid Pulse
54 // threaded mainloop and the handle of the created stream will be returned by
55 // |stream|.
56 bool CreateInputStream(pa_threaded_mainloop* mainloop,
57                        pa_context* context,
58                        pa_stream** stream,
59                        const AudioParameters& params,
60                        const std::string& device_id,
61                        pa_stream_notify_cb_t stream_callback,
62                        void* user_data);
63
64 // Create a playback stream for the threaded mainloop, return true if success,
65 // otherwise false. This function will create a new Pulse threaded mainloop,
66 // and the handles of the mainloop, context and stream will be returned by
67 // |mainloop|, |context| and |stream|.
68 bool CreateOutputStream(pa_threaded_mainloop** mainloop,
69                         pa_context** context,
70                         pa_stream** stream,
71                         const AudioParameters& params,
72                         const std::string& device_id,
73                         pa_stream_notify_cb_t stream_callback,
74                         pa_stream_request_cb_t write_callback,
75                         void* user_data);
76
77 }  // namespace pulse
78
79 }  // namespace media
80
81 #endif  // MEDIA_AUDIO_PULSE_PULSE_UTIL_H_