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Diffstat (limited to 'media/audio/mac/audio_synchronized_mac.h')
| -rw-r--r-- | media/audio/mac/audio_synchronized_mac.h | 216 |
1 files changed, 0 insertions, 216 deletions
diff --git a/media/audio/mac/audio_synchronized_mac.h b/media/audio/mac/audio_synchronized_mac.h deleted file mode 100644 index a6db48e..0000000 --- a/media/audio/mac/audio_synchronized_mac.h +++ /dev/null @@ -1,216 +0,0 @@ -// Copyright (c) 2012 The Chromium Authors. All rights reserved. -// Use of this source code is governed by a BSD-style license that can be -// found in the LICENSE file. - -#ifndef MEDIA_AUDIO_MAC_AUDIO_SYNCHRONIZED_MAC_H_ -#define MEDIA_AUDIO_MAC_AUDIO_SYNCHRONIZED_MAC_H_ - -#include <AudioToolbox/AudioToolbox.h> -#include <AudioUnit/AudioUnit.h> -#include <CoreAudio/CoreAudio.h> - -#include "base/compiler_specific.h" -#include "base/synchronization/lock.h" -#include "media/audio/audio_io.h" -#include "media/audio/audio_parameters.h" -#include "media/base/audio_bus.h" -#include "media/base/audio_fifo.h" - -namespace media { - -class AudioManagerMac; -class ChannelMixer; - -// AudioSynchronizedStream allows arbitrary combinations of input and output -// devices running off different clocks and using different drivers, with -// potentially differing sample-rates. It implements AudioOutputStream -// and shuttles its synchronized I/O data using AudioSourceCallback. -// -// It is required to first acquire the native sample rate of the selected -// output device and then use the same rate when creating this object. -// -// ............................................................................ -// Theory of Operation: -// . -// INPUT THREAD . OUTPUT THREAD -// +-----------------+ +------+ . -// | Input AudioUnit | --> | | . -// +-----------------+ | | . -// | FIFO | . -// | | +-----------+ -// | | -----> | Varispeed | -// | | +-----------+ -// +------+ . | -// . | +-----------+ -// . OnMoreIOData() --> | Output AU | -// . +-----------+ -// -// The input AudioUnit's InputProc is called on one thread which feeds the -// FIFO. The output AudioUnit's OutputProc is called on a second thread -// which pulls on the varispeed to get the current input data. The varispeed -// handles mismatches between input and output sample-rate and also clock drift -// between the input and output drivers. The varispeed consumes its data from -// the FIFO and adjusts its rate dynamically according to the amount -// of data buffered in the FIFO. If the FIFO starts getting too much data -// buffered then the varispeed will speed up slightly to compensate -// and similarly if the FIFO doesn't have enough data buffered then the -// varispeed will slow down slightly. -// -// Finally, once the input data is available then OnMoreIOData() is called -// which is given this input, and renders the output which is finally sent -// to the Output AudioUnit. -class AudioSynchronizedStream : public AudioOutputStream { - public: - // The ctor takes all the usual parameters, plus |manager| which is the - // the audio manager who is creating this object. - AudioSynchronizedStream(AudioManagerMac* manager, - const AudioParameters& params, - AudioDeviceID input_id, - AudioDeviceID output_id); - - virtual ~AudioSynchronizedStream(); - - // Implementation of AudioOutputStream. - virtual bool Open() OVERRIDE; - virtual void Close() OVERRIDE; - virtual void Start(AudioSourceCallback* callback) OVERRIDE; - virtual void Stop() OVERRIDE; - - virtual void SetVolume(double volume) OVERRIDE; - virtual void GetVolume(double* volume) OVERRIDE; - - OSStatus SetInputDeviceAsCurrent(AudioDeviceID input_id); - OSStatus SetOutputDeviceAsCurrent(AudioDeviceID output_id); - AudioDeviceID GetInputDeviceID() { return input_info_.id_; } - AudioDeviceID GetOutputDeviceID() { return output_info_.id_; } - - bool IsRunning(); - - private: - // Initialization. - OSStatus CreateAudioUnits(); - OSStatus SetupInput(AudioDeviceID input_id); - OSStatus EnableIO(); - OSStatus SetupOutput(AudioDeviceID output_id); - OSStatus SetupCallbacks(); - OSStatus SetupStreamFormats(); - void AllocateInputData(); - - // Handlers for the AudioUnit callbacks. - OSStatus HandleInputCallback(AudioUnitRenderActionFlags* io_action_flags, - const AudioTimeStamp* time_stamp, - UInt32 bus_number, - UInt32 number_of_frames, - AudioBufferList* io_data); - - OSStatus HandleVarispeedCallback(AudioUnitRenderActionFlags* io_action_flags, - const AudioTimeStamp* time_stamp, - UInt32 bus_number, - UInt32 number_of_frames, - AudioBufferList* io_data); - - OSStatus HandleOutputCallback(AudioUnitRenderActionFlags* io_action_flags, - const AudioTimeStamp* time_stamp, - UInt32 bus_number, - UInt32 number_of_frames, - AudioBufferList* io_data); - - // AudioUnit callbacks. - static OSStatus InputProc(void* user_data, - AudioUnitRenderActionFlags* io_action_flags, - const AudioTimeStamp* time_stamp, - UInt32 bus_number, - UInt32 number_of_frames, - AudioBufferList* io_data); - - static OSStatus VarispeedProc(void* user_data, - AudioUnitRenderActionFlags* io_action_flags, - const AudioTimeStamp* time_stamp, - UInt32 bus_number, - UInt32 number_of_frames, - AudioBufferList* io_data); - - static OSStatus OutputProc(void* user_data, - AudioUnitRenderActionFlags* io_action_flags, - const AudioTimeStamp* time_stamp, - UInt32 bus_number, - UInt32 number_of_frames, - AudioBufferList* io_data); - - // Our creator. - AudioManagerMac* manager_; - - // Client parameters. - AudioParameters params_; - - double input_sample_rate_; - double output_sample_rate_; - - // Pointer to the object that will provide the audio samples. - AudioSourceCallback* source_; - - // Values used in Open(). - AudioDeviceID input_id_; - AudioDeviceID output_id_; - - // The input AudioUnit renders its data here. - AudioBufferList* input_buffer_list_; - - // Holds the actual data for |input_buffer_list_|. - scoped_ptr<AudioBus> input_bus_; - - // Used to overlay AudioBufferLists. - scoped_ptr<AudioBus> wrapper_bus_; - - class AudioDeviceInfo { - public: - AudioDeviceInfo() - : id_(kAudioDeviceUnknown), - is_input_(false), - buffer_size_frames_(0) {} - void Initialize(AudioDeviceID inID, bool isInput); - bool IsInitialized() const { return id_ != kAudioDeviceUnknown; } - - AudioDeviceID id_; - bool is_input_; - UInt32 buffer_size_frames_; - }; - - AudioDeviceInfo input_info_; - AudioDeviceInfo output_info_; - - // Used for input to output buffering. - AudioFifo fifo_; - - // The optimal number of frames we'd like to keep in the FIFO at all times. - int target_fifo_frames_; - - // A running average of the measured delta between actual number of frames - // in the FIFO versus |target_fifo_frames_|. - double average_delta_; - - // A varispeed rate scalar which is calculated based on FIFO drift. - double fifo_rate_compensation_; - - // AudioUnits. - AudioUnit input_unit_; - AudioUnit varispeed_unit_; - AudioUnit output_unit_; - - double first_input_time_; - - bool is_running_; - int hardware_buffer_size_; - int channels_; - - // Channel mixer used to transform mono to stereo data. It is only created - // if the input_hardware_channels is mono. - scoped_ptr<ChannelMixer> channel_mixer_; - scoped_ptr<AudioBus> mixer_bus_; - - DISALLOW_COPY_AND_ASSIGN(AudioSynchronizedStream); -}; - -} // namespace media - -#endif // MEDIA_AUDIO_MAC_AUDIO_SYNCHRONIZED_MAC_H_ |