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Side by Side Diff: media/audio/pulse/pulse_output.h

Issue 10952024: Adding pulseaudio input support to chrome (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: rebased and ready for review. Created 7 years, 10 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 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 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 // 4 //
5 // Creates an audio output stream based on the PulseAudio asynchronous API; 5 // Creates an audio output stream based on the PulseAudio asynchronous API;
6 // specifically using the pa_threaded_mainloop model. 6 // specifically using the pa_threaded_mainloop model.
7 // 7 //
8 // If the stream is successfully opened, Close() must be called before the 8 // If the stream is successfully opened, Close() must be called before the
9 // stream is deleted as Close() is responsible for ensuring resource cleanup 9 // stream is deleted as Close() is responsible for ensuring resource cleanup
10 // occurs. 10 // occurs.
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47 virtual void SetVolume(double volume) OVERRIDE; 47 virtual void SetVolume(double volume) OVERRIDE;
48 virtual void GetVolume(double* volume) OVERRIDE; 48 virtual void GetVolume(double* volume) OVERRIDE;
49 49
50 private: 50 private:
51 // Called by PulseAudio when |pa_context_| and |pa_stream_| change state. If 51 // Called by PulseAudio when |pa_context_| and |pa_stream_| change state. If
52 // an unexpected failure state change happens and |source_callback_| is set 52 // an unexpected failure state change happens and |source_callback_| is set
53 // these methods will forward the error via OnError(). 53 // these methods will forward the error via OnError().
54 static void ContextNotifyCallback(pa_context* c, void* p_this); 54 static void ContextNotifyCallback(pa_context* c, void* p_this);
55 static void StreamNotifyCallback(pa_stream* s, void* p_this); 55 static void StreamNotifyCallback(pa_stream* s, void* p_this);
56 56
57 // Triggers pa_threaded_mainloop_signal() to avoid deadlocks.
58 static void StreamSuccessCallback(pa_stream* s, int success, void* p_this);
59
60 // Called by PulseAudio when it needs more audio data. 57 // Called by PulseAudio when it needs more audio data.
61 static void StreamRequestCallback(pa_stream* s, size_t len, void* p_this); 58 static void StreamRequestCallback(pa_stream* s, size_t len, void* p_this);
62 59
63 // Fulfill a write request from the write request callback. Outputs silence 60 // Fulfill a write request from the write request callback. Outputs silence
64 // if the request could not be fulfilled. 61 // if the request could not be fulfilled.
65 void FulfillWriteRequest(size_t requested_bytes); 62 void FulfillWriteRequest(size_t requested_bytes);
66 63
67 // Close() helper function to free internal structs. 64 // Close() helper function to free internal structs.
68 void Reset(); 65 void Reset();
69 66
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93 90
94 // Container for retrieving data from AudioSourceCallback::OnMoreData(). 91 // Container for retrieving data from AudioSourceCallback::OnMoreData().
95 scoped_ptr<AudioBus> audio_bus_; 92 scoped_ptr<AudioBus> audio_bus_;
96 93
97 DISALLOW_COPY_AND_ASSIGN(PulseAudioOutputStream); 94 DISALLOW_COPY_AND_ASSIGN(PulseAudioOutputStream);
98 }; 95 };
99 96
100 } // namespace media 97 } // namespace media
101 98
102 #endif // MEDIA_AUDIO_PULSE_PULSE_OUTPUT_H_ 99 #endif // MEDIA_AUDIO_PULSE_PULSE_OUTPUT_H_
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