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/**
* OpenAL cross platform audio library
* Copyright (C) 2010 by Chris Robinson
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
* Or go to http://www.gnu.org/copyleft/lgpl.html
*/
#include "config.h"
#include <stdlib.h>
#include <jni.h>
#include <pthread.h>
#include "alMain.h"
#include "AL/al.h"
#include "AL/alc.h"
#include "AL/android.h"
static int doPause=0;
int resumeHandled;
int pauseHandled;
static const ALCchar android_device[] = "Android Default";
static JavaVM* javaVM = NULL;
static jclass cAudioTrack = NULL;
static jmethodID mAudioTrack;
static jmethodID mGetMinBufferSize;
static jmethodID mPlay;
static jmethodID mStop;
static jmethodID mRelease;
static jmethodID mWrite;
static jmethodID mPause;
jint JNI_OnLoad(JavaVM* vm, void* reserved)
{
javaVM = vm;
return JNI_VERSION_1_2;
}
static JNIEnv* GetEnv()
{
JNIEnv* env = NULL;
if (javaVM) (*javaVM)->GetEnv(javaVM, (void**)&env, JNI_VERSION_1_2);
return env;
}
typedef struct
{
pthread_t thread;
volatile int running;
} AndroidData;
#define STREAM_MUSIC 3
#define CHANNEL_CONFIGURATION_MONO 2
#define CHANNEL_CONFIGURATION_STEREO 3
#define ENCODING_PCM_8BIT 3
#define ENCODING_PCM_16BIT 2
#define MODE_STREAM 1
static void* thread_function(void* arg)
{
ALCdevice* device = (ALCdevice*)arg;
AndroidData* data = (AndroidData*)device->ExtraData;
JNIEnv* env;
(*javaVM)->AttachCurrentThread(javaVM, &env, NULL);
(*env)->PushLocalFrame(env, 2);
int sampleRateInHz = device->Frequency;
int channelConfig = aluChannelsFromFormat(device->Format) == 1 ? CHANNEL_CONFIGURATION_MONO : CHANNEL_CONFIGURATION_STEREO;
int audioFormat = aluBytesFromFormat(device->Format) == 1 ? ENCODING_PCM_8BIT : ENCODING_PCM_16BIT;
int bufferSizeInBytes = (*env)->CallStaticIntMethod(env, cAudioTrack,
mGetMinBufferSize, sampleRateInHz, channelConfig, audioFormat);
int bufferSizeInSamples = bufferSizeInBytes / aluFrameSizeFromFormat(device->Format);
jobject track = (*env)->NewObject(env, cAudioTrack, mAudioTrack,
STREAM_MUSIC, sampleRateInHz, channelConfig, audioFormat, device->NumUpdates * bufferSizeInBytes, MODE_STREAM);
//(*env)->CallNonvirtualVoidMethod(env, track, cAudioTrack, mPlay);
jarray buffer = (*env)->NewByteArray(env, bufferSizeInBytes);
pauseHandled=0;
resumeHandled=0;
while (data->running)
{
if(doPause && !pauseHandled)
{
(*env)->CallNonvirtualVoidMethod(env, track, cAudioTrack, mPause);
pauseHandled=1;
}
if(!doPause && !resumeHandled)
{
(*env)->CallNonvirtualVoidMethod(env, track, cAudioTrack, mPlay);
resumeHandled=1;
}
void* pBuffer = (*env)->GetPrimitiveArrayCritical(env, buffer, NULL);
if (pBuffer)
{
aluMixData(device, pBuffer, bufferSizeInSamples);
(*env)->ReleasePrimitiveArrayCritical(env, buffer, pBuffer, 0);
(*env)->CallNonvirtualIntMethod(env, track, cAudioTrack, mWrite, buffer, 0, bufferSizeInBytes);
}
else
{
AL_PRINT("Failed to get pointer to array bytes");
}
}
(*env)->CallNonvirtualVoidMethod(env, track, cAudioTrack, mStop);
(*env)->CallNonvirtualVoidMethod(env, track, cAudioTrack, mRelease);
(*env)->PopLocalFrame(env, NULL);
(*javaVM)->DetachCurrentThread(javaVM);
return NULL;
}
static ALCboolean android_open_playback(ALCdevice *device, const ALCchar *deviceName)
{
JNIEnv* env = GetEnv();
AndroidData* data;
int channels;
int bytes;
if (!cAudioTrack)
{
/* Cache AudioTrack class and it's method id's
* And do this only once!
*/
cAudioTrack = (*env)->FindClass(env, "android/media/AudioTrack");
if (!cAudioTrack)
{
AL_PRINT("android.media.AudioTrack class is not found. Are you running at least 1.5 version?");
return ALC_FALSE;
}
cAudioTrack = (*env)->NewGlobalRef(env, cAudioTrack);
mAudioTrack = (*env)->GetMethodID(env, cAudioTrack, "<init>", "(IIIIII)V");
mGetMinBufferSize = (*env)->GetStaticMethodID(env, cAudioTrack, "getMinBufferSize", "(III)I");
mPlay = (*env)->GetMethodID(env, cAudioTrack, "play", "()V");
mPause = (*env)->GetMethodID(env, cAudioTrack, "pause", "()V");
mStop = (*env)->GetMethodID(env, cAudioTrack, "stop", "()V");
mRelease = (*env)->GetMethodID(env, cAudioTrack, "release", "()V");
mWrite = (*env)->GetMethodID(env, cAudioTrack, "write", "([BII)I");
}
if (!deviceName)
{
deviceName = android_device;
}
else if (strcmp(deviceName, android_device) != 0)
{
return ALC_FALSE;
}
data = (AndroidData*)calloc(1, sizeof(*data));
device->szDeviceName = strdup(deviceName);
device->ExtraData = data;
return ALC_TRUE;
}
static void android_close_playback(ALCdevice *device)
{
AndroidData* data = (AndroidData*)device->ExtraData;
if (data != NULL)
{
free(data);
device->ExtraData = NULL;
}
}
static ALCboolean android_reset_playback(ALCdevice *device)
{
AndroidData* data = (AndroidData*)device->ExtraData;
if (aluChannelsFromFormat(device->Format) >= 2)
{
device->Format = aluBytesFromFormat(device->Format) >= 2 ? AL_FORMAT_STEREO16 : AL_FORMAT_STEREO8;
}
else
{
device->Format = aluBytesFromFormat(device->Format) >= 2 ? AL_FORMAT_MONO16 : AL_FORMAT_MONO8;
}
SetDefaultChannelOrder(device);
data->running = 1;
pthread_create(&data->thread, NULL, thread_function, device);
return ALC_TRUE;
}
static void android_stop_playback(ALCdevice *device)
{
AndroidData* data = (AndroidData*)device->ExtraData;
if (data->running)
{
data->running = 0;
pthread_join(data->thread, NULL);
}
}
static ALCboolean android_open_capture(ALCdevice *pDevice, const ALCchar *deviceName)
{
(void)pDevice;
(void)deviceName;
return ALC_FALSE;
}
static void android_close_capture(ALCdevice *pDevice)
{
(void)pDevice;
}
static void android_start_capture(ALCdevice *pDevice)
{
(void)pDevice;
}
static void android_stop_capture(ALCdevice *pDevice)
{
(void)pDevice;
}
static void android_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
{
(void)pDevice;
(void)pBuffer;
(void)lSamples;
}
static ALCuint android_available_samples(ALCdevice *pDevice)
{
(void)pDevice;
return 0;
}
static const BackendFuncs android_funcs = {
android_open_playback,
android_close_playback,
android_reset_playback,
android_stop_playback,
android_open_capture,
android_close_capture,
android_start_capture,
android_stop_capture,
android_capture_samples,
android_available_samples
};
void alc_android_init(BackendFuncs *func_list)
{
*func_list = android_funcs;
}
void alc_android_deinit(void)
{
JNIEnv* env = GetEnv();
/* release cached AudioTrack class */
(*env)->DeleteGlobalRef(env, cAudioTrack);
}
void alc_android_probe(int type)
{
if (type == DEVICE_PROBE)
{
AppendDeviceList(android_device);
}
else if (type == ALL_DEVICE_PROBE)
{
AppendAllDeviceList(android_device);
}
}
AL_API void AL_APIENTRY al_android_pause_playback()
{
doPause=1;
pauseHandled=0;
AL_PRINT("Audio paused.");
}
AL_API void AL_APIENTRY al_android_resume_playback()
{
doPause=0;
resumeHandled=0;
AL_PRINT("Audio resumed.");
}
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