Examples of PortAudio called by Java's Panama APIs JEP 412.

At the moment this is purely exploratory (still kicking the tires) as it progresses in the future it may be a port of accessing PortAudio completely in Java.

Go to: http://portaudio.com/docs/v19-doxydocs/tutorial_start.html

Getting started

1. As of this writting the download of Java 19 JDK with jextract tool isn't released: https://jdk.java.net/panama/ So, new to this project it to clone Panama's project and build it! *To get this working go and clone https://github.com/openjdk/panama-foreign

  $ # download LLVM to your MacOS clang+llvm-9.x
  $ git clone git@github.com:openjdk/panama-foreign.git
  $ cd panama-foreign
  $ make clean
  $ bash configure --with-libclang=/<install_directory_path_to>/clang+llvm-9.0.1-x86_64-apple-darwin/
  $ make images 

After creating your new OpenJDK 19 containing jextract set your JAVA_HOME and path to the new images. Make sure the file setup.sh contains the new path to the newly built openjdk!

 $ export JAVA_HOME=$HOME/projects/panama-foreign/build/macosx-x86_64-server-release/images/jdk

2. Set your JAVA_HOME and PATH
   • Note: If installed in $HOME/sdks directory you can do the following: This assumes you're at Step 6 below

     $ cd ~/projects/portaudio4j
     $ source setup.sh
     

3. Set your LD_LIBRARY_PATH or DYLD_LIBRARY_PATH
4. Clone and build PortAudio library: git@github.com:PortAudio/portaudio.git
5. Compile and run the first example paex_saw.c https://github.com/PortAudio/portaudio/blob/master/examples/paex_saw.c
6. Clone portaudio4j (this) project at: git@github.com:carldea/portaudio4j.git
7. Jextract header includes
8. Compile and run Java port of the example.

Clone PortAudio

Create a projects folder that contains both PortAudio and later portaudio4j

$ cd ~
$ mkdir ~/projects
$ cd ~/projects
$ git clone git@github.com:PortAudio/portaudio.git
$ cd portaudio

Create port audio library

$ ./configure && make

Compile the first example called pae_saw.c

$ cd examples

# MacOS you'll need to include frameworks 
$ gcc -Wall \
   -I ../include \
   -I /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include \
   paex_saw.c \
   -o paex_saw ../lib/.libs/libportaudio.a \
   -framework CoreServices \
   -framework CoreFoundation \
   -framework AudioUnit \
   -framework AudioToolbox \
   -framework CoreAudio

Run compiled example app.

$ ./paex_saw

Keep the executable handy as you will run it again to listen to the sound. To test whether it sounds like the Java Panama version!

Run as the Java Panama version

Assuming the Port Audio library is build from the prior step you'll want to point the library path to the directory.

# MacOS
$ export DYLD_LIBRARY_PATH=.:~/projects/portaudio/lib/.libs/
# Linux
$ export LD_LIBRARY_PATH=.:~/projects/portaudio/lib/.libs/

$ cd ~/projects
$ git clone git@github.com:carldea/portaudio4j.git
$ cd portaudio4j

Run jextract tool against foo.h containing stdio.h, math.h, portaudio.h

JExtract only works against one header (include) file so a trick is to create a foo.h containing the multiple includes.

$ ./jextract_foo.h.sh

Compile Java PaexSaw.java

Will create Java classes locally.

$ ./compile_paex_saw.java.sh

# Or the following:
$ javac -cp .:classes \
   -d . \
   --add-modules jdk.incubator.foreign \
   src/PaexSaw.java

Run PaexSaw.java

Will run the example PaexSaw.java

$ ./run_paex_saw.java.sh

# Or the following:
java -cp .:classes \
  --enable-native-access=ALL-UNNAMED \
  --add-modules jdk.incubator.foreign \
  PaexSaw

Known issues:

1. (fixed) The Panama version (this file), is too loud and may have some timing issue as the sound doesn't sound the same as the high pitch of the native C version.
2. This version is for MacOS and Linux at the moment.
3. (fixed) One setting is different. To have the same settings for SAMPLE_RATE the example would be too loud!!! So, it's currently at 22050 hz.