我该如何处理电话从JNI来AudioTrack没有崩溃? [英] How do I handle calls to AudioTrack from jni without crashing?
问题描述
我试图写从JNI回调的AudioTrack,我也得到一个信号7(SIGBUS),故障地址00000000。
我已经看过了Wolf3D例子 odroid 并他们似乎使用android.os.Handler发布一个Runnable,会做一个更新,在正确的线程上下文。我也曾尝试AttachCurrentThread,但我不能在这种情况下也。
它可以播放声音从构造上运行时,即使我把它包在一个线程,然后将其发布到处理程序。当我从JNI做到了相同的通过回调失败。我以为我braeaking一些规则,但我一直没能找出它们是什么。到目前为止,我还没有找到答案在这里左右。
所以我不知道是否有人知道应如何做。
编辑:下面回答
下面code是为了说明这个问题。
Java的:
包com.example.jniaudiotrack;
进口android.app.Activity;
进口android.media.AudioFormat;
进口android.media.AudioManager;
进口android.media.AudioTrack;
进口android.os.Bundle;
进口android.os.Handler;
进口android.util.Log;
公共类JniAudioTrackActivity延伸活动{
AudioTrack mAudioTrack;
byte []的马尔;
公共静态最后的处理程序mHandler =新的处理程序();
/ **第一次创建活动时调用。 * /
@覆盖
公共无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.main);
马尔=新的字节[2048];
的for(int i = 0; I< 2048;我++){
马尔[I] =(字节)(Math.sin(一)* 128);
}
mAudioTrack =新AudioTrack(AudioManager.STREAM_MUSIC,
11025,
AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_8BIT,
2048,
AudioTrack.MODE_STREAM);
mAudioTrack.play();
新主题(新的Runnable(){
公共无效的run(){
mHandler.post(新的Runnable(){
公共无效的run(){
mAudioTrack.write(马尔,0,2048);
Log.i(TAG,***从构造处理程序***);
}
});
}
})。开始();
新主题(新的Runnable(){
公共无效的run(){
audioFunc();
}
})。开始();
}
公共本地无效audioFunc();
@燮pressWarnings(未使用)
私人无效audioCB(){
mHandler.post(新的Runnable(){
公共无效的run(){
mAudioTrack.write(马尔,0,2048);
Log.i(TAG,*** audioCB叫***);
}
});
}
私有静态最后字符串变量=JniAudioTrackActivity;
静态{
的System.loadLibrary(jni_audiotrack);
}
}
CPP:
的#include< jni.h>
为externC{
JNIEXPORT无效Java_com_example_jniaudiotrack_JniAudioTrackActivity_audioFunc(JNIEnv的* ENV,jobject OBJ);
}
JNIEXPORT无效Java_com_example_jniaudiotrack_JniAudioTrackActivity_audioFunc(JNIEnv的* ENV,jobject OBJ)
{
JNIEnv的* JNIEnv的;
JavaVM的*虚拟机;
ENV-> GetJavaVM(安培; VM);
VM-> AttachCurrentThread(安培; JNIEnv的,0);
JCLASS CLS = ENV-> GetObjectClass(OBJ);
jmethodID audioCBID = ENV->的GetMethodID(CLS,audioCB,()V);
如果(!audioCBID){
返回;
}
ENV-> CallVoidMethod(CLS,audioCBID);
}
跟踪片断:
I / DEBUG(1653):PID:9811,TID:9811>>> com.example.jniaudiotrack<<<
I / DEBUG(1653):信号7(SIGBUS),故障地址00000000
I / DEBUG(1653):R0 00000800 R1 R2 00000026 00000001 00000000 R3
I / DEBUG(1653):R4 42385726 R5 41049e54 R6 bee25570 R7 ad00e540
I / DEBUG(1653):R8 000040f8 R9 41048200 10 41049e44 FP 00000000
I / DEBUG(1653):IP 000000f8 SP bee25530 LR ad02dbb5 PC ad012358 CPSR 20000010
I / DEBUG(1653):#00件00012358 /system/lib/libdvm.so
<打击>似乎一直是内存问题。制作mAudioTrack和马尔静态的解决了这个问题。击>我是送错了对象回调。看到法登发表评论。我已删除调用AttachCurrentThread,因为它并没有使在这种情况下,任何差异。
Java的:
包com.example.jniaudiotrack;
进口android.app.Activity;
进口android.media.AudioFormat;
进口android.media.AudioManager;
进口android.media.AudioTrack;
进口android.os.Bundle;
进口android.os.Handler;
进口android.util.Log;
公共类JniAudioTrackActivity延伸活动{
公共AudioTrack mAudioTrack;
公共字节[]马尔;
公共静态处理程序mHandler =新的处理程序();
/ **第一次创建活动时调用。 * /
@覆盖
公共无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.main);
马尔=新的字节[2048];
的for(int i = 0; I&LT; 2048;我++){
马尔[I] =(字节)(Math.sin(一)* 128);
}
mAudioTrack =新AudioTrack(AudioManager.STREAM_MUSIC,
11025,
AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_8BIT,
2048,
AudioTrack.MODE_STREAM);
mAudioTrack.play();
新主题(新的Runnable(){
公共无效的run(){
audioFunc();
}
})。开始();
}
公共本地无效audioFunc();
@燮pressWarnings(未使用)
私人无效audioCB(){
mHandler.post(新的Runnable(){
公共无效的run(){
mAudioTrack.write(马尔,0,2048);
Log.i(TAG,*** audioCB叫***);
}
});
}
私有静态最后字符串变量=JniAudioTrackActivity;
静态{
的System.loadLibrary(jni_audiotrack);
}
}
.cpp的:
的#include&LT; jni.h&GT;
为externC{
JNIEXPORT无效Java_com_example_jniaudiotrack_JniAudioTrackActivity_audioFunc(JNIEnv的* ENV,jobject OBJ);
}
JNIEXPORT无效Java_com_example_jniaudiotrack_JniAudioTrackActivity_audioFunc(JNIEnv的* ENV,jobject OBJ)
{
JCLASS CLS = ENV-&GT; GetObjectClass(OBJ);
jmethodID audioCBID = ENV-&GT;的GetMethodID(CLS,audioCB,()V);
如果(!audioCBID){
返回;
}
ENV-&GT; CallVoidMethod(OBJ,audioCBID);
}
I was trying to write to an AudioTrack from a jni callback, and I get a signal 7 (SIGBUS), fault addr 00000000.
I have looked at the Wolf3D example for odroid and they seem to use a android.os.Handler to post a Runnable that will do an update in the correct thread context. I have also tried AttachCurrentThread, but I fail in this case also.
It works to play the sound when running from the constructor even if I wrap it in a thread and then post it to the handler. When I do the "same" via a callback from jni it fails. I assume I am braeaking some rules, but I haven't been able to figure out what they are. So far, I haven't found the answer here on SO.
So I wonder if anyone knows how this should be done.
EDIT: Answered below.
The following code is to illustrate the problem.
Java:
package com.example.jniaudiotrack;
import android.app.Activity;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
public class JniAudioTrackActivity extends Activity {
AudioTrack mAudioTrack;
byte[] mArr;
public static final Handler mHandler = new Handler();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mArr = new byte[2048];
for (int i = 0; i < 2048; i++) {
mArr[i] = (byte) (Math.sin(i) * 128);
}
mAudioTrack = new AudioTrack(AudioManager.STREAM_MUSIC,
11025,
AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_8BIT,
2048,
AudioTrack.MODE_STREAM);
mAudioTrack.play();
new Thread(new Runnable() {
public void run() {
mHandler.post(new Runnable() {
public void run() {
mAudioTrack.write(mArr, 0, 2048);
Log.i(TAG, "*** Handler from constructor ***");
}
});
}
}).start();
new Thread(new Runnable() {
public void run() {
audioFunc();
}
}).start();
}
public native void audioFunc();
@SuppressWarnings("unused")
private void audioCB() {
mHandler.post(new Runnable() {
public void run() {
mAudioTrack.write(mArr, 0, 2048);
Log.i(TAG, "*** audioCB called ***");
}
});
}
private static final String TAG = "JniAudioTrackActivity";
static {
System.loadLibrary("jni_audiotrack");
}
}
cpp:
#include <jni.h>
extern "C" {
JNIEXPORT void Java_com_example_jniaudiotrack_JniAudioTrackActivity_audioFunc(JNIEnv* env, jobject obj);
}
JNIEXPORT void Java_com_example_jniaudiotrack_JniAudioTrackActivity_audioFunc(JNIEnv* env, jobject obj)
{
JNIEnv* jniEnv;
JavaVM* vm;
env->GetJavaVM(&vm);
vm->AttachCurrentThread(&jniEnv, 0);
jclass cls = env->GetObjectClass(obj);
jmethodID audioCBID = env->GetMethodID(cls, "audioCB", "()V");
if (!audioCBID) {
return;
}
env->CallVoidMethod(cls, audioCBID);
}
Trace snippet:
I/DEBUG ( 1653): pid: 9811, tid: 9811 >>> com.example.jniaudiotrack <<<
I/DEBUG ( 1653): signal 7 (SIGBUS), fault addr 00000000
I/DEBUG ( 1653): r0 00000800 r1 00000026 r2 00000001 r3 00000000
I/DEBUG ( 1653): r4 42385726 r5 41049e54 r6 bee25570 r7 ad00e540
I/DEBUG ( 1653): r8 000040f8 r9 41048200 10 41049e44 fp 00000000
I/DEBUG ( 1653): ip 000000f8 sp bee25530 lr ad02dbb5 pc ad012358 cpsr 20000010
I/DEBUG ( 1653): #00 pc 00012358 /system/lib/libdvm.so
There seems to have been a memory problem. Making mAudioTrack and mArr static solved it. I was sending the wrong object to the callback. See comment by fadden. I have removed the call to AttachCurrentThread since it did not make any difference in this case.
Java:
package com.example.jniaudiotrack;
import android.app.Activity;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
public class JniAudioTrackActivity extends Activity {
public AudioTrack mAudioTrack;
public byte[] mArr;
public static Handler mHandler = new Handler();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mArr = new byte[2048];
for (int i = 0; i < 2048; i++) {
mArr[i] = (byte) (Math.sin(i) * 128);
}
mAudioTrack = new AudioTrack(AudioManager.STREAM_MUSIC,
11025,
AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_8BIT,
2048,
AudioTrack.MODE_STREAM);
mAudioTrack.play();
new Thread(new Runnable() {
public void run() {
audioFunc();
}
}).start();
}
public native void audioFunc();
@SuppressWarnings("unused")
private void audioCB() {
mHandler.post(new Runnable() {
public void run() {
mAudioTrack.write(mArr, 0, 2048);
Log.i(TAG, "*** audioCB called ***");
}
});
}
private static final String TAG = "JniAudioTrackActivity";
static {
System.loadLibrary("jni_audiotrack");
}
}
Cpp:
#include <jni.h>
extern "C" {
JNIEXPORT void Java_com_example_jniaudiotrack_JniAudioTrackActivity_audioFunc(JNIEnv* env, jobject obj);
}
JNIEXPORT void Java_com_example_jniaudiotrack_JniAudioTrackActivity_audioFunc(JNIEnv* env, jobject obj)
{
jclass cls = env->GetObjectClass(obj);
jmethodID audioCBID = env->GetMethodID(cls, "audioCB", "()V");
if (!audioCBID) {
return;
}
env->CallVoidMethod(obj, audioCBID);
}
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