2020. 3. 22. 17:23ㆍ카테고리 없음
About The HAL plugin acts as virtual sound interface for CoreAudio, the native sound system in Mac OS X. It initializes a single sound interface called PulseAudio with one single input and output stream with two mono channels each, resulting in a simple stereo interface.
Future versions might have a configurable number of sound devices with a configurable number of input and output channels. Applications using the CoreAudio sound interface will inhertily instanciate the HAL subsystem, which will search for plugins in /Library/Audio/Plug-Ins/HAL upon startup. Once the hardware is started, the plugin will connect to the configured PulseAudio sound server and register input and output streams within this connection.
Audio Plug-in (hal Audio Plug-in For Mac Os
All sound produced by the audio application will be sent to the server for further processing, and all sound offered by the server for record purposes will be sent to the audio application. Technical details The HAL plugin component of this project implements a CFBundle which exports a AudioHardwarePlugin plugin interface which is described in /System/Library/Frameworks/CoreAudio.framework/Headers/AudioHardwarePlugIn.h. The plugin interface has callback for different domains of enities, namely the plugin container itself, AudioDevices, AudioStreams and the abstract object type in CoreAudio, AudioObjects. The code in the plugin is constructed in a way that calls to each plugin interface function are routed to methods of individual class implementations. In contrast to the code of kindly provided by Apple, the code in this project has almost no reference to external sources.