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| 1 // Copyright (c) 2011 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_LINUX_PULSE_OUTPUT_H_ |
| 6 #define MEDIA_AUDIO_LINUX_PULSE_OUTPUT_H_ |
| 7 |
| 8 #include <pulse/pulseaudio.h> |
| 9 |
| 10 #include <string> |
| 11 |
| 12 #include "base/memory/scoped_ptr.h" |
| 13 #include "media/audio/audio_io.h" |
| 14 #include "media/audio/audio_parameters.h" |
| 15 |
| 16 namespace media { |
| 17 class SeekableBuffer; |
| 18 } |
| 19 |
| 20 class AudioManagerLinux; |
| 21 |
| 22 class PulseAudioOutputStream : public AudioOutputStream { |
| 23 public: |
| 24 PulseAudioOutputStream(const AudioParameters& params, |
| 25 AudioManagerLinux* manager); |
| 26 |
| 27 virtual ~PulseAudioOutputStream(); |
| 28 |
| 29 // Implementation of AudioOutputStream. |
| 30 virtual bool Open(); |
| 31 virtual void Close(); |
| 32 virtual void Start(AudioSourceCallback* callback); |
| 33 virtual void Stop(); |
| 34 virtual void SetVolume(double volume); |
| 35 virtual void GetVolume(double* volume); |
| 36 |
| 37 private: |
| 38 // PulseAudio Callbacks. |
| 39 static void ContextStateCallback(pa_context* context, void* userdata); |
| 40 static void WriteCallback(pa_stream* stream, size_t length, void* userdata); |
| 41 |
| 42 // Functions to get another packet from the data source and write it into the |
| 43 // PulseAudio device. |
| 44 void ClientBufferLoop(); |
| 45 void BufferPacketInClient(); |
| 46 |
| 47 // API for Proxying calls to the AudioSourceCallback provided during Start(). |
| 48 uint32 RunDataCallback(uint8* dest, |
| 49 uint32 max_size, |
| 50 AudioBuffersState buffers_state); |
| 51 |
| 52 // Configuration constants from the constructor. Referencable by all threads |
| 53 // since they are constants. |
| 54 const ChannelLayout channel_layout_; |
| 55 const pa_sample_format_t sample_format_; |
| 56 const uint32 sample_rate_; |
| 57 const uint32 bytes_per_frame_; |
| 58 |
| 59 // Device configuration data. Populated after OpenTask() completes. |
| 60 uint32 packet_size_; |
| 61 uint32 frames_per_packet_; |
| 62 |
| 63 // Flag indicating the code should stop reading from the data source or |
| 64 // writing to the PulseAudio server. This is set because the device has |
| 65 // entered an unrecoverable error state, or the Close() has executed. |
| 66 bool stream_stopped_; |
| 67 |
| 68 // Audio manager that created us. Used to report that we've closed. |
| 69 AudioManagerLinux* manager_; |
| 70 |
| 71 // PulseAudio API structs. |
| 72 pa_mainloop* pa_mainloop_; |
| 73 pa_mainloop_api* pa_mainloop_api_; |
| 74 pa_context* pa_context_; |
| 75 |
| 76 // PulseAudio attribute and specification structs. |
| 77 pa_sample_spec pa_sample_specs_; |
| 78 pa_buffer_attr pa_buffer_attributes_; |
| 79 pa_cvolume pa_volume_; |
| 80 |
| 81 // Handle to the actual PulseAudio playback stream. |
| 82 pa_stream* playback_handle_; |
| 83 |
| 84 // Internal buffer. |
| 85 scoped_ptr<media::SeekableBuffer> client_buffer_; |
| 86 bool source_exhausted_; |
| 87 |
| 88 AudioSourceCallback* source_callback_; |
| 89 |
| 90 DISALLOW_COPY_AND_ASSIGN(PulseAudioOutputStream); |
| 91 }; |
| 92 |
| 93 #endif // MEDIA_AUDIO_LINUX_PULSE_OUTPUT_H_ |
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