java native内存_JAVA 和 native 共享内存

java层

private ByteBuffer _recBuffer;

try{

_recBuffer = ByteBuffer.allocateDirect(204800); // Max 10 ms @ 48

} catch(Exception e) {

Log.d("UVCCamera","can not get _capBuffer");

}

native 层

jclass cls = env->GetObjectClass(thiz);

if(cls == NULL){

LOGE("cls == NULL");

} else {

}

jfieldID fidRecBuffer = env->GetFieldID( cls, "_recBuffer", "Ljava/nio/ByteBuffer;");

if(fidRecBuffer == NULL){

LOGE("fidRecBuffer == NULL");

} else {

}

jobject javaRecBufferLocal = env->GetObjectField(thiz, fidRecBuffer);

if(javaPlayBufferLocal == NULL){

LOGE("javaPlayBufferLocal == NULL");

} else {

}

_javaRecBuffer = env->NewGlobalRef(javaRecBufferLocal);

if(_javaRecBuffer == NULL){

LOGE("_javaRecBuffer == NULL");

} else {

_javaDirectRecBuffer =env->GetDirectBufferAddress(_javaRecBuffer);

}

void* _javaDirectRecBuffer; // Direct buffer pointer to rec buffer

jobject _javaRecBuffer;

可以对_javaDirectRecBuffer进行操作，再java 层会同时更新数据