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/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2010 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#include "SDL_android.h"
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extern "C" {
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#include "../../events/SDL_events_c.h"
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#include "../../video/android/SDL_androidkeyboard.h"
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#include "../../video/android/SDL_androidtouch.h"
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#include "../../video/android/SDL_androidvideo.h"
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/* Impelemented in audio/android/SDL_androidaudio.c */
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extern void Android_RunAudioThread();
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} // C
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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 <android/log.h>
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/*******************************************************************************
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Globals
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*******************************************************************************/
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static JNIEnv* mEnv = NULL;
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static JNIEnv* mAudioEnv = NULL;
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// Main activity
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static jclass mActivityClass;
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// method signatures
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static jmethodID midCreateGLContext;
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static jmethodID midFlipBuffers;
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static jmethodID midAudioInit;
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static jmethodID midAudioWriteShortBuffer;
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static jmethodID midAudioWriteByteBuffer;
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static jmethodID midAudioQuit;
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// Accelerometer data storage
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static 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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{
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return JNI_VERSION_1_4;
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}
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// Called before SDL_main() to initialize JNI bindings
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extern "C" void SDL_Android_Init(JNIEnv* env, jclass cls)
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{
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__android_log_print(ANDROID_LOG_INFO, "SDL", "SDL_Android_Init()");
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mEnv = env;
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mActivityClass = cls;
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midCreateGLContext = mEnv->GetStaticMethodID(mActivityClass,
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"createGLContext","()V");
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midFlipBuffers = mEnv->GetStaticMethodID(mActivityClass,
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"flipBuffers","()V");
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midAudioInit = mEnv->GetStaticMethodID(mActivityClass,
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"audioInit", "(IZZI)Ljava/lang/Object;");
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midAudioWriteShortBuffer = mEnv->GetStaticMethodID(mActivityClass,
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"audioWriteShortBuffer", "([S)V");
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midAudioWriteByteBuffer = mEnv->GetStaticMethodID(mActivityClass,
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"audioWriteByteBuffer", "([B)V");
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midAudioQuit = mEnv->GetStaticMethodID(mActivityClass,
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"audioQuit", "()V");
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if(!midCreateGLContext || !midFlipBuffers || !midAudioInit ||
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!midAudioWriteShortBuffer || !midAudioWriteByteBuffer || !midAudioQuit) {
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__android_log_print(ANDROID_LOG_WARN, "SDL", "SDL: Couldn't locate Java callbacks, check that they're named and typed correctly");
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}
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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, jclass jcls,
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jint width, jint height, jint format)
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{
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Android_SetScreenResolution(width, height, format);
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}
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// Keydown
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyDown(
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JNIEnv* env, jclass jcls, jint keycode)
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{
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Android_OnKeyDown(keycode);
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}
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// Keyup
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyUp(
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JNIEnv* env, jclass jcls, jint keycode)
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{
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Android_OnKeyUp(keycode);
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}
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// Touch
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeTouch(
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JNIEnv* env, jclass jcls,
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jint action, jfloat x, jfloat y, jfloat p)
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{
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Android_OnTouch(action, x, y, p);
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}
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// Accelerometer
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeAccel(
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JNIEnv* env, jclass jcls,
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jfloat x, jfloat y, jfloat z)
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{
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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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// Quit
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extern "C" void Java_org_libsdl_app_SDLActivity_nativeQuit(
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JNIEnv* env, jclass cls)
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{
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// Inject a SDL_QUIT event
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SDL_SendQuit();
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}
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extern "C" void Java_org_libsdl_app_SDLActivity_nativeRunAudioThread(
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JNIEnv* env, jclass cls)
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{
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/* This is the audio thread, with a different environment */
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mAudioEnv = env;
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Android_RunAudioThread();
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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_JNI_CreateContext()
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{
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mEnv->CallStaticVoidMethod(mActivityClass, midCreateGLContext);
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}
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extern "C" void Android_JNI_SwapWindow()
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{
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mEnv->CallStaticVoidMethod(mActivityClass, midFlipBuffers);
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}
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extern "C" void Android_JNI_SetActivityTitle(const char *title)
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{
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jmethodID mid;
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mid = mEnv->GetStaticMethodID(mActivityClass,"setActivityTitle","(Ljava/lang/String;)V");
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if (mid) {
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mEnv->CallStaticVoidMethod(mActivityClass, mid, mEnv->NewStringUTF(title));
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}
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}
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extern "C" void Android_JNI_GetAccelerometerValues(float values[3])
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{
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int i;
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for (i = 0; i < 3; ++i) {
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values[i] = fLastAccelerometer[i];
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}
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}
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//
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// Audio support
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//
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static jboolean audioBuffer16Bit = JNI_FALSE;
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static jboolean audioBufferStereo = JNI_FALSE;
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static jobject audioBuffer = NULL;
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static void* audioBufferPinned = NULL;
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extern "C" int Android_JNI_OpenAudioDevice(int sampleRate, int is16Bit, int channelCount, int desiredBufferFrames)
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{
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int audioBufferFrames;
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__android_log_print(ANDROID_LOG_VERBOSE, "SDL", "SDL audio: opening device");
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audioBuffer16Bit = is16Bit;
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audioBufferStereo = channelCount > 1;
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audioBuffer = mEnv->CallStaticObjectMethod(mActivityClass, midAudioInit, sampleRate, audioBuffer16Bit, audioBufferStereo, desiredBufferFrames);
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if (audioBuffer == NULL) {
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__android_log_print(ANDROID_LOG_WARN, "SDL", "SDL audio: didn't get back a good audio buffer!");
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return 0;
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}
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audioBuffer = mEnv->NewGlobalRef(audioBuffer);
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jboolean isCopy = JNI_FALSE;
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if (audioBuffer16Bit) {
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audioBufferPinned = mEnv->GetShortArrayElements((jshortArray)audioBuffer, &isCopy);
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audioBufferFrames = mEnv->GetArrayLength((jshortArray)audioBuffer);
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} else {
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audioBufferPinned = mEnv->GetByteArrayElements((jbyteArray)audioBuffer, &isCopy);
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audioBufferFrames = mEnv->GetArrayLength((jbyteArray)audioBuffer);
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}
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if (audioBufferStereo) {
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audioBufferFrames /= 2;
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}
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return audioBufferFrames;
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}
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extern "C" void * Android_JNI_GetAudioBuffer()
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{
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return audioBufferPinned;
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}
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extern "C" void Android_JNI_WriteAudioBuffer()
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{
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if (audioBuffer16Bit) {
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mAudioEnv->ReleaseShortArrayElements((jshortArray)audioBuffer, (jshort *)audioBufferPinned, JNI_COMMIT);
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mAudioEnv->CallStaticVoidMethod(mActivityClass, midAudioWriteShortBuffer, (jshortArray)audioBuffer);
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} else {
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mAudioEnv->ReleaseByteArrayElements((jbyteArray)audioBuffer, (jbyte *)audioBufferPinned, JNI_COMMIT);
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mAudioEnv->CallStaticVoidMethod(mActivityClass, midAudioWriteByteBuffer, (jbyteArray)audioBuffer);
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}
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/* JNI_COMMIT means the changes are committed to the VM but the buffer remains pinned */
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}
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extern "C" void Android_JNI_CloseAudioDevice()
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{
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mEnv->CallStaticVoidMethod(mActivityClass, midAudioQuit);
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if (audioBuffer) {
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mEnv->DeleteGlobalRef(audioBuffer);
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audioBuffer = NULL;
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audioBufferPinned = NULL;
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}
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}
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/* vi: set ts=4 sw=4 expandtab: */
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