android/project/jni/android-support.cpp
author Sam Lantinga <slouken@libsdl.org>
Tue, 04 Jan 2011 15:25:49 -0800
changeset 4957 5e42031a8d70
parent 4953 4f40b11e1045
permissions -rw-r--r--
Need to set something valid for argc/argv
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/*******************************************************************************
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 This file links the Java side of Android with libsdl
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*******************************************************************************/
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#include <jni.h>
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#include <sys/time.h>
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#include <time.h>
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#include <android/log.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <pthread.h>
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#define DEBUG
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/*******************************************************************************
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                               Globals
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*******************************************************************************/
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static long _getTime(void){
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	struct timeval  now;
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	gettimeofday(&now, NULL);
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	return (long)(now.tv_sec*1000 + now.tv_usec/1000);
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}
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JNIEnv* mEnv = NULL;
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JNIEnv* mAudioThreadEnv = NULL; //See the note below for why this is necessary
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JavaVM* mVM = NULL;
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//Main activity
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jclass mActivityInstance;
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//method signatures
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jmethodID midCreateGLContext;
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jmethodID midFlipBuffers;
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jmethodID midEnableFeature;
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jmethodID midUpdateAudio;
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extern "C" int SDL_main(int argc, char *argv[]);
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extern "C" int Android_OnKeyDown(int keycode);
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extern "C" int Android_OnKeyUp(int keycode);
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extern "C" void Android_SetScreenResolution(int width, int height);
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extern "C" void Android_OnResize(int width, int height, int format);
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extern "C" int SDL_SendQuit();
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extern "C" void Android_EnableFeature(int featureid, bool enabled);
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//If we're not the active app, don't try to render
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bool bRenderingEnabled = false;
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//Feature IDs
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static const int FEATURE_AUDIO = 1;
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static const int FEATURE_ACCEL = 2;
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//Accelerometer data storage
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float fLastAccelerometer[3];
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/*******************************************************************************
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                 Functions called by JNI
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*******************************************************************************/	
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//Library init
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extern "C" jint JNI_OnLoad(JavaVM* vm, void* reserved){
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    JNIEnv* env = NULL;
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    jint result = -1;
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    if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) {
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        return result;
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    }
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    mEnv = env;
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    __android_log_print(ANDROID_LOG_INFO, "SDL", "JNI: OnLoad");
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    jclass cls = mEnv->FindClass ("org/libsdl/app/SDLActivity"); 
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    mActivityInstance = cls;
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    midCreateGLContext = mEnv->GetStaticMethodID(cls,"createGLContext","()V");
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    midFlipBuffers = mEnv->GetStaticMethodID(cls,"flipBuffers","()V");
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    midEnableFeature = mEnv->GetStaticMethodID(cls,"enableFeature","(II)V");
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    midUpdateAudio = mEnv->GetStaticMethodID(cls,"updateAudio","([B)V");
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    if(!midCreateGLContext || !midFlipBuffers || !midEnableFeature ||
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        !midUpdateAudio){
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        __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: Bad mids\n");
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    }else{
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#ifdef DEBUG
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        __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: Good mids\n");
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#endif
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    }
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    return JNI_VERSION_1_4;
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}
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//Start up the SDL app
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extern "C" void Java_org_libsdl_app_SDLActivity_nativeInit( JNIEnv* env, 
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                                                                jobject obj ){ 
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	__android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: Native Init");
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	mEnv = env;
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	bRenderingEnabled = true;
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	Android_EnableFeature(FEATURE_ACCEL, true);
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    char *argv[2];
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    argv[0] = strdup("SDL_app");
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    argv[1] = NULL;
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    SDL_main(1, argv);
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}
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//Keydown
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyDown(JNIEnv* env, 
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               jobject obj, jint keycode){
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    int r = Android_OnKeyDown(keycode);
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#ifdef DEBUG
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    __android_log_print(ANDROID_LOG_INFO, "SDL", 
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                        "SDL: native key down %d, %d\n", keycode, r);
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#endif
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}
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//Keyup
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyUp(JNIEnv* env, 
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               jobject obj, jint keycode){
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    int r = Android_OnKeyUp(keycode);
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#ifdef DEBUG
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    __android_log_print(ANDROID_LOG_INFO, "SDL", 
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                        "SDL: native key up %d, %d\n", keycode, r);
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#endif
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}
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//Touch
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeTouch(JNIEnv* env, 
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               jobject obj, jint action, jfloat x, jfloat y, jfloat p){
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#ifdef DEBUG
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    __android_log_print(ANDROID_LOG_INFO, "SDL", 
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                        "SDL: native touch event %d @ %f/%f, pressure %f\n", 
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                        action, x, y, p);
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#endif
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    //TODO: Pass this off to the SDL multitouch stuff
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}
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//Quit
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extern "C" void Java_org_libsdl_app_SDLActivity_nativeQuit( JNIEnv*  env, 
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                                                                jobject obj ){    
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    //Stop rendering as we're no longer in the foreground
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	bRenderingEnabled = false;
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    //Inject a SDL_QUIT event
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    int r = SDL_SendQuit();
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    __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: Native quit %d", r);        
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}
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//Screen size
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extern "C" void Java_org_libsdl_app_SDLActivity_nativeSetScreenSize(
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                JNIEnv*  env, jobject obj, jint width, jint height){
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    __android_log_print(ANDROID_LOG_INFO, "SDL", 
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                        "SDL: Set screen size on init: %d/%d\n", width, height);
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    Android_SetScreenResolution(width, height);
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}
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//Resize
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeResize(
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                                        JNIEnv*  env, jobject obj, jint width, 
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                                        jint height, jint format){
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    Android_OnResize(width, height, format);
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}
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeAccel(
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                                        JNIEnv*  env, jobject obj,
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                                        jfloat x, jfloat y, jfloat z){
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    fLastAccelerometer[0] = x;
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    fLastAccelerometer[1] = y;
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    fLastAccelerometer[2] = z;   
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}
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/*******************************************************************************
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             Functions called by SDL into Java
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*******************************************************************************/
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extern "C" void Android_CreateContext(){
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	__android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: sdl_create_context()\n");
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	bRenderingEnabled = true;
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    mEnv->CallStaticVoidMethod(mActivityInstance, midCreateGLContext ); 
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}
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extern "C" void Android_Render(){
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    if(!bRenderingEnabled){
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        return;
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    }
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    //When we get here, we've accumulated a full frame    
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    mEnv->CallStaticVoidMethod(mActivityInstance, midFlipBuffers ); 
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}
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extern "C" void Android_EnableFeature(int featureid, bool enabled){
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    mEnv->CallStaticVoidMethod(mActivityInstance, midEnableFeature, 
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                                featureid, (int)enabled); 
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}
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extern "C" void Android_UpdateAudioBuffer(unsigned char *buf, int len){
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    //Annoyingly we can't just call into Java from any thread. Because the audio
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    //callback is dispatched from the SDL audio thread (that wasn't made from
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    //java, we have to do some magic here to let the JVM know about the thread.
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    //Because everything it touches on the Java side is static anyway, it's 
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    //not a big deal, just annoying.
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    if(!mAudioThreadEnv){
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        __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: Need to set up audio thread env\n");
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        mVM->AttachCurrentThread(&mAudioThreadEnv, NULL);
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        __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: ok\n");
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    }
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    jbyteArray arr = mAudioThreadEnv->NewByteArray(len);
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    //blah. We probably should rework this so we avoid the copy. 
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    mAudioThreadEnv->SetByteArrayRegion(arr, 0, len, (jbyte *)buf);
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    __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: copied\n");
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    mAudioThreadEnv->CallStaticVoidMethod(  mActivityInstance, 
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                                            midUpdateAudio, arr );
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    __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: invoked\n");
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}
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