Re: [Linphone-developers] Video call on Android without OpenGL ES 2

[Balder Mørk]

Den 13.08.2014 15:26, skrev Balder Mørk:
> Hi,
> I am working on an Android app that will use liblinphone for receiving 
> calls (preferably video) from SIP clients. My app will probably have 
> to work on quite limited devics, including some that don't have OpenGL 
> ES 2.0 support. From what I can see, AndroidVideoWindowImpl.java has 
> code for doing software rendering (controlled by the useGLrendering 
> member), but I can only get the video rendering to work if I feed 
> AndroidVideoWindowImpl a GL2JNIView object.
>
> I checked the archives, but I couldn't find any mention of this:
> 1) Is it possible to make mediastreamer2/liblinphone do software 
> rendering on devices without OpenGL ES 2 support?
> 2) How does Linphone handle this problem?
I've come a bit further with this, by editing msvoip.c and changing the 
if (1) block that chooses the openGL displayfilter for Android over the 
software filters. Now I've stumbled across a few other problems:

1) When building liblinphone I get the following error:

jni/..//submodules/linphone/mediastreamer2/build/android/../../src/android/android-display-bad.cpp:285: 
error: undefined reference to 'ms_factory_register_filter(_MSFactory*, 
_MSFilterDesc*)'

I notice that the function arguments have '_' prepended to the argument 
types, but I know too little about C/C++ to figure out why this line 
fails to build.

2) If I comment out the line in msvoip.c that tries to init the "bad" 
display filter, I can build and run, but once I try to load video (I'm 
using a plain SurfaceView for the video view supplied to 
AndroidVideoWindowImpl) I get a crash because requestOrientation is no 
longer found in AndroidVideoWindowImpl. Commenting out references to 
requestOrientation gets me a step further, but crashes like so:

Video to display has size 352x288
JNI WARNING: 0xb140f9f8 is not a valid JNI reference
in Ldalvik/system/NativeStart;.run:()V (GetIntField)
"Thread-202" prio=5 tid=11 RUNNABLE
| group="main" sCount=0 dsCount=0 obj=0xb13600c8 self=0xb7de8270
| sysTid=3833 nice=0 sched=0/0 cgrp=[fopen-error:2] handle=-1210128528
| state=R schedstat=( 0 0 0 ) utm=0 stm=0 core=0
 at dalvik.system.NativeStart.run(Native Method)
[ 08-18 19:31:13.473  3798: 3833 E/dalvikvm ]
VM aborting

Are the Android software filters supposed to work? If they are, did they 
break recently or is this a problem with my setup? I'm grateful for any 
help here, especially since I've hardly touched C/C++ in years, not to 
mention JNI.

I'm currently building from master, but if I should be using some tag 
that's more stable, please let me know.


Balder Mørk