B4A Library Midi Driver Lib

Android have still not allowed streaming Midi to the internal Midi device so for those interested in trying out streaming midi data to the onboard Sonivox midi device, here is a wrapper for BillTheFarmers Midi Driver. This is the first of a few things I will be posting over the next week or two that are Midi Related.

Be aware that performance will vary greatly depending on the device it is used on.

The wrapper is pretty light with very few modifications. It has been working pretty well while I have been developing other things (to be released soon) so I thought I'd share it sooner rather than later.

Unfortunately the Midi Driver Lib is too large to upload to the Forum as it contains the Sonivox Library even though it uses a fraction of it (see link below).

The Midi Piano project attached is what is says it is, a graphic of a piano that sends midi note on, note off and patch change messages to the driver.

If you do not know anything about the Midi standards I suggest you do some research before starting to try to program it. Two very good resources are:

http://www.sonicspot.com/guide/midifiles.html

and

http://www.somascape.org/midi/tech/mfile.html

You should be able to get most of the information you need from these.

I am hoping that I can soon release a port of a large portion of the Javax.Midi classes, written entirely in B4a which will support MidiEvents, Sequence ,RealTimeSequencer and Recording which may also be of interest.

The Midi Piano app depends on JavaObject and Gestures Libraries and of course the MidiDriver Lib available below. Unzip the jar and XML files and copy them to your additional Libraries folder.

The biggest downside is that we are stuck with the reverb, apparently the Sonivox library has disabled the changing of the reverb by conventional means. I am trying to find out their Sysex command structure, but am not having much luck so far. I'll keep you posted on that one.

You can download the Midi Driver V2 Library from my Google Drive here.

This is definitely Beta software, please test it thoroughly and let me know if you find any issues in this thread. It would also be useful to know how usable it is on different devices.

For my part, it's OK on my 2013 Nexus 7.

Update to V2 (Download from the above link) to allow newer android devices to access the mididriver (Requires the MidiSystem2 download from here)

Enjoy
 

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  • MidiPiano.zip
    14.9 KB · Views: 583
Last edited:

stevel05

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OK, If it was originally based on an example, let me know which one and I will make sure that there is not a conflict in it. Just for peace of mind.
 

kimstudio

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Hi Steve, I checked the github and there is a latest version of mididriver 1.26 available. The demo shows that the reverb seems works.
With #AdditionalJar: MidiDriver-1.26.aar added I can make it sound using Javaobject directly.

The problem is the engine configuration can't be set like sampling rate, currently is 22050 which I want 44100. Anyway this seems is the simpler method to play midi directly comparing to via mediaplayer or other libs like Fluidsynth, which should be better with soundfont support.
 

stevel05

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The demo shows that the reverb seems works.
That's interesting, When I get some time I might look at wrapping the new version to work with the Midi library.
engine configuration can't be set
It appears that it is not wrapped in the github project, I haven't looked at the underlying sonivox library to see if it's possible but I wouldn't be creating a native library anyway so we have what is wrapped in the github project.

As you have proved it works, I would probably wrap it as a b4xlib, rather than a Java library.
 

kimstudio

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That would be great to have a B4X lib. I don't know how to call the "OnMidiStartListener" by using JavaObejct. Although by looking at the code it seems without this callback also fine.
 

toby_pd

Member
Hi Steve,
trying to compile your midi driver test app, I have this error:
C:\Android\tools\..\extras\b4a_local\unpacked-midisystem-63834279686718\dex_v1\midisystem.zip:classes.dex:B4A Versione: 12.50
Analisi del Codice. (0.00s)
Java Versione: 11
Building folders structure. (0.10s)
Compilazione del codice. (0.01s)
Compilazione del codice di layouts (0.01s)
Organizzazione Librerie. (0.31s)
(AndroidX SDK)
Compilazione risorse (0.51s)
Collegamento risorse (0.59s)
Compilazione del codice debugger. (0.50s)
Compilazione del codice Java prodotto. (2.49s)
Ricerca librerie che necessitano di essere "dexed". (0.01s)
Dex code (3.10s)
Dex merge Error
Error in C:\Android\tools\..\extras\b4a_local\unpacked-mididriver-63645035592233\dex_v1\mididriver.zip:classes.dex:
Type com.stevel05.MidiDriverWrapper is defined multiple times: C:\Android\tools\..\extras\b4a_local\unpacked-mididriver-63645035592233\dex_v1\mididriver.zip:classes.dex, C:\B4A\SourceCode\MidiDriverTest\Objects\dexed\com\stevel05\MidiDriverWrapper.dex
Compilation failed
Exception in thread "main" java.lang.RuntimeException: com.android.tools.r8.CompilationFailedException: Compilation failed to complete, origin: C:\Android\tools\..\extras\b4a_local\unpacked-mididriver-63645035592233\dex_v1\mididriver.zip:classes.dex
at com.android.tools.r8.internal.vj.a(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:98)
at com.android.tools.r8.D8.main(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:4)
Caused by: com.android.tools.r8.CompilationFailedException: Compilation failed to complete, origin: C:\Android\tools\..\extras\b4a_local\unpacked-mididriver-63645035592233\dex_v1\mididriver.zip:classes.dex
at Version.fakeStackEntry(Version_3.3.20-dev+aosp1.java:0)
at com.android.tools.r8.internal.vj.a(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:75)
at com.android.tools.r8.internal.vj.a(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:28)
at com.android.tools.r8.internal.vj.a(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:27)
at com.android.tools.r8.internal.vj.b(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:2)
at com.android.tools.r8.D8.a(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:22)
at com.android.tools.r8.D8.a(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:17)
at com.android.tools.r8.internal.vj.a(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:85)
... 1 more
Caused by: com.android.tools.r8.internal.f: Type com.stevel05.MidiDriverWrapper is defined multiple times: C:\Android\tools\..\extras\b4a_local\unpacked-mididriver-63645035592233\dex_v1\mididriver.zip:classes.dex, C:\B4A\SourceCode\MidiDriverTest\Objects\dexed\com\stevel05\MidiDriverWrapper.dex
at com.android.tools.r8.internal.YS.a(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:14)
at com.android.tools.r8.internal.YS.a(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:22)
at com.android.tools.r8.internal.cN.a(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:36)
at com.android.tools.r8.internal.cN.a(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:10)
at java.base/java.util.concurrent.ConcurrentHashMap.merge(ConcurrentHashMap.java:2048)
at com.android.tools.r8.internal.cN.a(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:6)
at com.android.tools.r8.graph.E2$a.e(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:4)
at com.android.tools.r8.dex.b.a(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:105)
at com.android.tools.r8.dex.b.a(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:28)
at com.android.tools.r8.D8.a(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:25)
at com.android.tools.r8.D8.d(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:609)
at com.android.tools.r8.D8.c(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:1)
at com.android.tools.r8.internal.vj.a(R8_3.3.20-dev+aosp1_dd4c01853fd917497aef2d09abff533f0d25b062517ea74449d40e1778a34753:24)
... 5 more
What is wong?
Many thanks!
toby
 

stevel05

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This is the problem:
Caused by: com.android.tools.r8.internal.f: Type com.stevel05.MidiDriverWrapper is defined multiple times: C:\Android\tools\..\extras\b4a_local\unpacked-mididriver-63645035592233\dex_v1\mididriver.zip:classes.dex, C:\B4A\SourceCode\MidiDriverTest\Objects\dexed\com\stevel05\MidiDriverWrapper.dex

Which test app are you running? The MidiPiano in this thread?
 

stevel05

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I just downloaded and ran it without issue. If you've amended the project can you zip and post your project. From the menu File/ExportAsZip

You will need to change the android:targetSdkVersion to 31 as shown in the logs. From the Menu Project/ManifestEditor
 
Last edited:

toby_pd

Member
Hi Steve, this is the project. I added only "#AdditionalJar: com.android.support:support-v4" to avoid the error: "Impossibile trovare: C:\Program Files (x86)\Anywhere Software\Basic4android\libraries\android-support-v4.jar".
I also tried to compile it on another pc with this result result.:
Convert byte code - optimized dex. Error
Uncaught translation error: java.lang.IllegalArgumentException: already added: Lorg/billthefarmer/mididriver/MidiDriver;
Uncaught translation error: java.lang.IllegalArgumentException: already added: Lorg/billthefarmer/mididriver/MidiDriver$OnMidiStartListener;
2 errors; aborting

Thank you!
 

Attachments

  • MDT.zip
    7.2 KB · Views: 32

toby_pd

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I don't know how but the attached project is successfully compilated but, when run on the target phone this error is raised:

Logger connected to: samsung SM-S908B
--------- beginning of main
Copying updated assets files (1)
*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create (first time) **
Error occurred on line: 35 (Main)
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean com.stevel05.midilib.midireceiver.IsInitialized()' on a null object reference
at com.stevel05.midilib.mididevice_static._getdefaultreceiverdevice(mididevice_static.java:358)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:348)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:157)
at b4a.example.main.afterFirstLayout(main.java:105)
at b4a.example.main.access$000(main.java:17)
at b4a.example.main$WaitForLayout.run(main.java:83)
at android.os.Handler.handleCallback(Handler.java:942)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:226)
at android.os.Looper.loop(Looper.java:313)
at android.app.ActivityThread.main(ActivityThread.java:8762)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:604)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1067)
 

Attachments

  • midi.zip
    10 KB · Views: 37

toby_pd

Member
Hi Steve, exscuse me and ignore the previous posts. I succeded to run the project in midi.zip decommenting line 31.
Now i can go on with my project.
Thanks again!
 
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