Basically I'm trying to pass the surface which is created by Java
Application to my native library. When I use the GetIntField()
function to get the surface object (ISurface) function, the object
passed by app is becoimg null. Anyone faced similar issues?
Thanks,
Sandeep
On Mar 18, 2:31 pm, Sandy <snarr...@gmail.com> wrote:
> I'm having issues when trying to use the java surface on the native
> side. However, when I create the surface on the native side, the media
> playback is fine.
>
> The following are the things that I'm doing in my code:
>
> 1. Creating a Surface View and getting the Surface from the Surface
> Holder from the application layer.
> 2. Using JNI, pass the Surface Holder object to your native
> application.
> 3. Use this object to obtain Surface object
>
> However, the sufracehandle is null in the JNI. Have anyone faced
> similar issues ? Any workarounds or suggestions on how to fix this
> issue?
>
> My code would look like:
>
> Player.java:
> Class Player
> {
> Surface mSurface;
> private SurfaceView surfaceView;
> private SurfaceHolder surfaceHolder;
> native void play ();
>
> onCreate ()
> {
> surfaceView = (SurfaceView)
> findViewById(R.id.SurfaceViewRendererSurface);
> surfaceHolder = surfaceView.getHolder();
> surfaceHolder.addCallback(this);
> surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
> /* Populate mSurface object here. */
> mSurface = surfaceHolder.getSurface ();
> ......
> play ();
> ......
>
> }
> }
>
> Player.cpp:
> .....
> .....
> struct fields_t {
> jfieldID surface;
> jfieldID surface_native;};
>
> static fields_t fields;
>
> static sp<Surface> get_surface(JNIEnv* env, jobject thiz) {
> Surface* const p = (Surface*)env->GetIntField(thiz,
> fields.surface_native);
> return sp<Surface>(p);
>
> }
>
> jint Java_com_test_Media_Media_play (JNIEnv *env, jobject thiz)
> {
> sp<Surface> nSurfaceHandle;
> jobject surface = env->GetObjectField(thiz, fields.surface);
>
> if (surface != NULL) {
> const sp<Surface>& native_surface = get_surface(env, surface);
> nSurfaceHandle = native_surface;
>
> if (nSurfaceHandle == NULL)
> {
> LOGE ("ERROR :: Surface Handle NULL");
>
> }
> }
> return 0;
> }
>
> Thanks in advance.
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