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| 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_MAC_AUDIO_UNIFIED_MAC_H_ |
| 6 #define MEDIA_AUDIO_MAC_AUDIO_UNIFIED_MAC_H_ |
| 7 |
| 8 #include <AudioUnit/AudioUnit.h> |
| 9 |
| 10 #include "base/memory/scoped_ptr.h" |
| 11 #include "media/audio/audio_io.h" |
| 12 #include "media/audio/audio_parameters.h" |
| 13 |
| 14 namespace media { |
| 15 |
| 16 class AudioManagerMac; |
| 17 |
| 18 // Implementation of AudioOutputStream for Mac OS X using the |
| 19 // CoreAudio AudioHardware API suitable for low-latency unified audio I/O |
| 20 // when using devices which support *both* input and output |
| 21 // in the same driver. This is the case with professional |
| 22 // USB and Firewire devices. |
| 23 // |
| 24 // Please note that it's required to first get the native sample-rate of the |
| 25 // default output device and use that sample-rate when creating this object. |
| 26 class AudioHardwareUnifiedStream : public AudioOutputStream { |
| 27 public: |
| 28 // The ctor takes all the usual parameters, plus |manager| which is the |
| 29 // the audio manager who is creating this object. |
| 30 AudioHardwareUnifiedStream(AudioManagerMac* manager, |
| 31 const AudioParameters& params); |
| 32 // The dtor is typically called by the AudioManager only and it is usually |
| 33 // triggered by calling AudioOutputStream::Close(). |
| 34 virtual ~AudioHardwareUnifiedStream(); |
| 35 |
| 36 // Implementation of AudioOutputStream. |
| 37 virtual bool Open() OVERRIDE; |
| 38 virtual void Close() OVERRIDE; |
| 39 virtual void Start(AudioSourceCallback* callback) OVERRIDE; |
| 40 virtual void Stop() OVERRIDE; |
| 41 virtual void SetVolume(double volume) OVERRIDE; |
| 42 virtual void GetVolume(double* volume) OVERRIDE; |
| 43 |
| 44 int input_channels() const { return input_channels_; } |
| 45 int output_channels() const { return output_channels_; } |
| 46 |
| 47 private: |
| 48 OSStatus Render(AudioDeviceID device, |
| 49 const AudioTimeStamp* now, |
| 50 const AudioBufferList* input_data, |
| 51 const AudioTimeStamp* input_time, |
| 52 AudioBufferList* output_data, |
| 53 const AudioTimeStamp* output_time); |
| 54 |
| 55 static OSStatus RenderProc(AudioDeviceID device, |
| 56 const AudioTimeStamp* now, |
| 57 const AudioBufferList* input_data, |
| 58 const AudioTimeStamp* input_time, |
| 59 AudioBufferList* output_data, |
| 60 const AudioTimeStamp* output_time, |
| 61 void* user_data); |
| 62 |
| 63 // Our creator, the audio manager needs to be notified when we close. |
| 64 AudioManagerMac* manager_; |
| 65 |
| 66 // Pointer to the object that will provide the audio samples. |
| 67 AudioSourceCallback* source_; |
| 68 |
| 69 // Structure that holds the stream format details such as bitrate. |
| 70 AudioStreamBasicDescription format_; |
| 71 |
| 72 // Hardware buffer size. |
| 73 int number_of_frames_; |
| 74 |
| 75 // Number of audio channels provided to the client via OnMoreIOData(). |
| 76 int client_input_channels_; |
| 77 |
| 78 // Volume level from 0 to 1. |
| 79 float volume_; |
| 80 |
| 81 // Number of input and output channels queried from the hardware. |
| 82 int input_channels_; |
| 83 int output_channels_; |
| 84 int input_channels_per_frame_; |
| 85 int output_channels_per_frame_; |
| 86 |
| 87 AudioDeviceIOProcID io_proc_id_; |
| 88 AudioDeviceID device_; |
| 89 bool is_playing_; |
| 90 |
| 91 // Intermediate buffers used with call to OnMoreIOData(). |
| 92 scoped_ptr<AudioBus> input_bus_; |
| 93 scoped_ptr<AudioBus> output_bus_; |
| 94 |
| 95 DISALLOW_COPY_AND_ASSIGN(AudioHardwareUnifiedStream); |
| 96 }; |
| 97 |
| 98 } // namespace media |
| 99 |
| 100 #endif // MEDIA_AUDIO_MAC_AUDIO_UNIFIED_MAC_H_ |
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