1 // Copyright 2013 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_UNIFIED_H_ 6 #define MEDIA_AUDIO_PULSE_PULSE_UNIFIED_H_ 7 8 #include <pulse/pulseaudio.h> 9 #include <string> 10 11 #include "base/memory/scoped_ptr.h" 12 #include "media/audio/audio_io.h" 13 #include "media/audio/audio_parameters.h" 14 #include "media/base/audio_fifo.h" 15 16 namespace media { 17 18 class AudioManagerBase; 19 class SeekableBuffer; 20 21 class PulseAudioUnifiedStream : public AudioOutputStream { 22 public: 23 PulseAudioUnifiedStream(const AudioParameters& params, 24 const std::string& input_device_id, 25 AudioManagerBase* manager); 26 27 virtual ~PulseAudioUnifiedStream(); 28 29 // Implementation of PulseAudioUnifiedStream. 30 virtual bool Open() OVERRIDE; 31 virtual void Close() OVERRIDE; 32 virtual void Start(AudioSourceCallback* callback) OVERRIDE; 33 virtual void Stop() OVERRIDE; 34 virtual void SetVolume(double volume) OVERRIDE; 35 virtual void GetVolume(double* volume) OVERRIDE; 36 37 private: 38 // Called by PulseAudio when |pa_stream_| change state. If an unexpected 39 // failure state change happens and |source_callback_| is set 40 // this method will forward the error via OnError(). 41 static void StreamNotifyCallback(pa_stream* s, void* user_data); 42 43 // Called by PulseAudio recording stream when it has data. 44 static void ReadCallback(pa_stream* s, size_t length, void* user_data); 45 46 // Helpers for ReadCallback() to read and write data. 47 void WriteData(size_t requested_bytes); 48 void ReadData(); 49 50 // Close() helper function to free internal structs. 51 void Reset(); 52 53 // AudioParameters from the constructor. 54 const AudioParameters params_; 55 56 // Device unique ID of the input device. 57 const std::string input_device_id_; 58 59 // Audio manager that created us. Used to report that we've closed. 60 AudioManagerBase* manager_; 61 62 // PulseAudio API structs. 63 pa_context* pa_context_; 64 pa_threaded_mainloop* pa_mainloop_; 65 pa_stream* input_stream_; 66 pa_stream* output_stream_; 67 68 // Float representation of volume from 0.0 to 1.0. 69 float volume_; 70 71 // Callback to audio data source. Must only be modified while holding a lock 72 // on |pa_mainloop_| via pa_threaded_mainloop_lock(). 73 AudioSourceCallback* source_callback_; 74 75 scoped_ptr<AudioBus> input_bus_; 76 scoped_ptr<AudioBus> output_bus_; 77 78 // Used for input to output buffering. 79 scoped_ptr<media::SeekableBuffer> fifo_; 80 81 // Temporary storage for recorded data. It gets a packet of data from 82 // |fifo_| and deliver the data to OnMoreIOData() callback. 83 scoped_ptr<uint8[]> input_data_buffer_; 84 85 DISALLOW_COPY_AND_ASSIGN(PulseAudioUnifiedStream); 86 }; 87 88 } // namespace media 89 90 #endif // MEDIA_AUDIO_PULSE_PULSE_UNIFIED_H_ 91