Cinder-PortAudio
PortAudio audio backend for cinder.
Supported Platforms
Initial development was done on Windows 10 Desktop, with a focus on enabling the ASIO backend, with included VS 2015 project files. @PetrosKataras added CMake support, which can be used on most other platforms (Linux, Mac OS X, etc).
Installation
You can use TinderBox to create a startup project. Clone this repo into your cinder/blocks folder and select the template "PortAudio: Sinewave". Note that the cinderblock.xml is setup to create a project with ASIO support, due to Steinberg's licensing you'll need to install the ASIO SDK following the instructions below.
Usage
To use PortAudio as the master audio::Context, add the following include:
#include "cinder/audio/ContextPortAudio.h"
and then make the following call before any other audio calls:
audio::ContextPortAudio::setAsMaster();
After that, you can use audio::master() like you usually would with cinder's built in audio::Context implementations, and you can query which devices are available with the usual audio::Device::printDevicesToString().
Also see the PortAudioBasic sample for how to get up and running. It has two sets of configurations, one with ASIO support and one without (Debug_NoAsio and Release_NoAsio).
Enabling Windows ASIO backend
For ASIO support on Windows, the simplest approach is to run the included lib\install_msw_asio.ps1 from a Command Prompt:
cd <Path to Cinder-PortAudio>
powershell lib\install_msw_asio.ps1
Alternatively, the following can be done by hand. Download the ASIO SDK from the Steinberg website here, unzip, and move to a folder at lib/ASIOSDK.
Then make sure that the following preprocessor macro is defined in your project:
PA_USE_ASIO=1
Lastly, include the following sources in your project:
lib/portaudio/src/hostapi/asio/*
lib/ASIOSDK/common/asio.cpp
lib/ASIOSDK/host/asiodrivers.cpp
lib/ASIOSDK/host/pc/asiolist.cpp
Enable Unicode Character Set
Most Cinder projects are build with Unicode Character Set (Configuration Properties -> General -> Character Set) and to make ASIO compatible with this, you need to add the following line to the top of lib/ASIOSDK/host/pc/asiolist.cpp, directly above the <#include "windows.h>:
#undef UNICODE
For more details on this, see the PortAudio docs: "Portaudio Windows ASIO with MSVC"
Debugging
To turn on portaudio debug logging functionality, you can define the following preprocessor macros:
PA_LOG_API_CALLS=1
PA_ENABLE_DEBUG_OUTPUT
If using Visual Studio, you also need the following to see the logs in the console:
PA_ENABLE_MSVC_DEBUG_OUTPUT