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annotate src/SDL_android.cpp @ 4996:8d7315668e35

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Fixed audio buffer lifecycle and implemented audio shutdown
author Sam Lantinga <slouken@libsdl.org>
date Thu, 13 Jan 2011 12:32:55 -0800
parents 9f9bea41e88f
children a21501393bef
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #include "SDL_android.h"
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25
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26 extern "C" {
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27 #include "events/SDL_events_c.h"
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28 #include "video/android/SDL_androidkeyboard.h"
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29 #include "video/android/SDL_androidvideo.h"
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30
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31 /* Impelemented in audio/android/SDL_androidaudio.c */
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32 extern void Android_RunAudioThread();
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33 } // C
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34
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35 /*******************************************************************************
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36 This file links the Java side of Android with libsdl
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37 *******************************************************************************/
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38 #include <jni.h>
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39 #include <android/log.h>
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40
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41
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42 /*******************************************************************************
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43 Globals
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44 *******************************************************************************/
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45 static JavaVM* mVM = NULL;
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46 static JNIEnv* mEnv = NULL;
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47 static JNIEnv* mAudioEnv = NULL;
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48
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49 // Main activity
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50 static jclass mActivityInstance;
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51
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52 // method signatures
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53 static jmethodID midCreateGLContext;
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54 static jmethodID midFlipBuffers;
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55 static jmethodID midAudioInit;
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56 static jmethodID midAudioWriteShortBuffer;
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57 static jmethodID midAudioWriteByteBuffer;
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58 static jmethodID midAudioQuit;
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59
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60 // Accelerometer data storage
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61 float fLastAccelerometer[3];
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62
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63
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64 /*******************************************************************************
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65 Functions called by JNI
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66 *******************************************************************************/
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67
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68 // Library init
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69 extern "C" jint JNI_OnLoad(JavaVM* vm, void* reserved)
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70 {
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71 mVM = vm;
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72
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73 return JNI_VERSION_1_4;
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74 }
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75
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76 // Called before SDL_main() to initialize JNI bindings
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77 extern "C" void SDL_Android_Init(JNIEnv* env)
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78 {
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79 mEnv = env;
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80
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81 __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL_Android_Init()");
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82
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83 jclass cls = mEnv->FindClass ("org/libsdl/app/SDLActivity");
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84 mActivityInstance = cls;
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85 midCreateGLContext = mEnv->GetStaticMethodID(cls,"createGLContext","()V");
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86 midFlipBuffers = mEnv->GetStaticMethodID(cls,"flipBuffers","()V");
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87 midAudioInit = mEnv->GetStaticMethodID(cls, "audioInit", "(IZZI)Ljava/lang/Object;");
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88 midAudioWriteShortBuffer = mEnv->GetStaticMethodID(cls, "audioWriteShortBuffer", "([S)V");
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89 midAudioWriteByteBuffer = mEnv->GetStaticMethodID(cls, "audioWriteByteBuffer", "([B)V");
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90 midAudioQuit = mEnv->GetStaticMethodID(cls, "audioQuit", "()V");
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91
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92 if(!midCreateGLContext || !midFlipBuffers || !midAudioInit ||
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93 !midAudioWriteShortBuffer || !midAudioWriteByteBuffer || !midAudioQuit) {
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94 __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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95 }
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96 }
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97
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98 // Resize
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99 extern "C" void Java_org_libsdl_app_SDLActivity_onNativeResize(
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100 JNIEnv* env, jobject obj,
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101 jint width, jint height, jint format)
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102 {
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103 Android_SetScreenResolution(width, height, format);
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104 }
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105
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106 // Keydown
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107 extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyDown(
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108 JNIEnv* env, jobject obj, jint keycode)
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109 {
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110 Android_OnKeyDown(keycode);
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111 }
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112
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113 // Keyup
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114 extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyUp(
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115 JNIEnv* env, jobject obj, jint keycode)
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116 {
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117 Android_OnKeyUp(keycode);
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118 }
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119
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120 // Touch
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121 extern "C" void Java_org_libsdl_app_SDLActivity_onNativeTouch(
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122 JNIEnv* env, jobject obj,
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123 jint action, jfloat x, jfloat y, jfloat p)
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124 {
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125 #ifdef DEBUG
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126 __android_log_print(ANDROID_LOG_INFO, "SDL",
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127 "SDL: native touch event %d @ %f/%f, pressure %f\n",
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128 action, x, y, p);
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129 #endif
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130
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131 //TODO: Pass this off to the SDL multitouch stuff
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132 }
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133
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134 // Accelerometer
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135 extern "C" void Java_org_libsdl_app_SDLActivity_onNativeAccel(
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136 JNIEnv* env, jobject obj,
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137 jfloat x, jfloat y, jfloat z)
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138 {
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139 fLastAccelerometer[0] = x;
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140 fLastAccelerometer[1] = y;
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141 fLastAccelerometer[2] = z;
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142 }
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143
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144 // Quit
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145 extern "C" void Java_org_libsdl_app_SDLActivity_nativeQuit(
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146 JNIEnv* env, jobject obj)
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147 {
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148 // Inject a SDL_QUIT event
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149 SDL_SendQuit();
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150 }
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151
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152 extern "C" void Java_org_libsdl_app_SDLActivity_nativeRunAudioThread(
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153 JNIEnv* env)
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154 {
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155 mVM->AttachCurrentThread(&mAudioEnv, NULL);
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156 Android_RunAudioThread();
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157 }
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158
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159
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160 /*******************************************************************************
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161 Functions called by SDL into Java
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162 *******************************************************************************/
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163 extern "C" void Android_JNI_CreateContext()
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164 {
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165 mEnv->CallStaticVoidMethod(mActivityInstance, midCreateGLContext);
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166 }
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167
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168 extern "C" void Android_JNI_SwapWindow()
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169 {
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170 mEnv->CallStaticVoidMethod(mActivityInstance, midFlipBuffers);
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171 }
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172
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173 //
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174 // Audio support
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175 //
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176 static jboolean audioBuffer16Bit = JNI_FALSE;
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177 static jboolean audioBufferStereo = JNI_FALSE;
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178 static jobject audioBuffer = NULL;
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179 static void* audioBufferPinned = NULL;
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180
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181 extern "C" int Android_JNI_OpenAudioDevice(int sampleRate, int is16Bit, int channelCount, int desiredBufferFrames)
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182 {
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183 int audioBufferFrames;
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184
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185 __android_log_print(ANDROID_LOG_VERBOSE, "SDL", "SDL audio: opening device");
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186 audioBuffer16Bit = is16Bit;
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187 audioBufferStereo = channelCount > 1;
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188
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189 audioBuffer = mEnv->CallStaticObjectMethod(mActivityInstance, midAudioInit, sampleRate, audioBuffer16Bit, audioBufferStereo, desiredBufferFrames);
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190
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191 if (audioBuffer == NULL) {
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192 __android_log_print(ANDROID_LOG_WARN, "SDL", "SDL audio: didn't get back a good audio buffer!");
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193 return 0;
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194 }
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195 audioBuffer = mEnv->NewGlobalRef(audioBuffer);
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196
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197 jboolean isCopy = JNI_FALSE;
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198 if (audioBuffer16Bit) {
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199 audioBufferPinned = mEnv->GetShortArrayElements((jshortArray)audioBuffer, &isCopy);
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200 audioBufferFrames = mEnv->GetArrayLength((jshortArray)audioBuffer);
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201 } else {
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202 audioBufferPinned = mEnv->GetByteArrayElements((jbyteArray)audioBuffer, &isCopy);
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203 audioBufferFrames = mEnv->GetArrayLength((jbyteArray)audioBuffer);
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204 }
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205 if (audioBufferStereo) {
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206 audioBufferFrames /= 2;
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207 }
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208
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209 return audioBufferFrames;
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210 }
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211
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212 extern "C" void * Android_JNI_GetAudioBuffer()
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213 {
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214 //jboolean isCopy = JNI_FALSE;
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215 //audioBufferPinned = mAudioEnv->GetPrimitiveArrayCritical((jarray)audioBuffer, &isCopy);
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216 return audioBufferPinned;
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217 }
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218
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219 extern "C" void Android_JNI_WriteAudioBuffer()
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220 {
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221 //mAudioEnv->ReleasePrimitiveArrayCritical((jarray)audioBuffer, audioBufferPinned, 0);
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222 if (audioBuffer16Bit) {
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223 mAudioEnv->ReleaseShortArrayElements((jshortArray)audioBuffer, (jshort *)audioBufferPinned, JNI_COMMIT);
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224 mAudioEnv->CallStaticVoidMethod(mActivityInstance, midAudioWriteShortBuffer, (jshortArray)audioBuffer);
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225 } else {
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226 mAudioEnv->ReleaseByteArrayElements((jbyteArray)audioBuffer, (jbyte *)audioBufferPinned, JNI_COMMIT);
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227 mAudioEnv->CallStaticVoidMethod(mActivityInstance, midAudioWriteByteBuffer, (jbyteArray)audioBuffer);
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228 }
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229
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230 /* JNI_COMMIT means the changes are committed to the VM but the buffer remains pinned */
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231 }
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232
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233 extern "C" void Android_JNI_CloseAudioDevice()
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234 {
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235 mEnv->CallStaticVoidMethod(mActivityInstance, midAudioQuit);
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236
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237 mEnv->DeleteGlobalRef(audioBuffer);
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238 audioBuffer = NULL;
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239 }
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240
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241 /* vi: set ts=4 sw=4 expandtab: */