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/*
* Copyright 2017, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//#define LOG_NDEBUG 0
#define LOG_TAG "JDataSourceCallback-JNI"
#include <utils/Log.h>
#include "android_media_DataSourceCallback.h"
#include "log/log.h"
#include "jni.h"
#include <nativehelper/JNIHelp.h>
#include <drm/drm_framework_common.h>
#include <mediaplayer2/JavaVMHelper.h>
#include <media/stagefright/foundation/ADebug.h>
#include <nativehelper/ScopedLocalRef.h>
namespace android {
static const size_t kBufferSize = 64 * 1024;
JDataSourceCallback::JDataSourceCallback(JNIEnv* env, jobject source)
: mJavaObjStatus(OK),
mSizeIsCached(false),
mCachedSize(0) {
mDataSourceCallbackObj = env->NewGlobalRef(source);
CHECK(mDataSourceCallbackObj != NULL);
ScopedLocalRef<jclass> media2DataSourceClass(env, env->GetObjectClass(mDataSourceCallbackObj));
CHECK(media2DataSourceClass.get() != NULL);
mReadAtMethod = env->GetMethodID(media2DataSourceClass.get(), "readAt", "(J[BII)I");
CHECK(mReadAtMethod != NULL);
mGetSizeMethod = env->GetMethodID(media2DataSourceClass.get(), "getSize", "()J");
CHECK(mGetSizeMethod != NULL);
mCloseMethod = env->GetMethodID(media2DataSourceClass.get(), "close", "()V");
CHECK(mCloseMethod != NULL);
ScopedLocalRef<jbyteArray> tmp(env, env->NewByteArray(kBufferSize));
mByteArrayObj = (jbyteArray)env->NewGlobalRef(tmp.get());
CHECK(mByteArrayObj != NULL);
}
JDataSourceCallback::~JDataSourceCallback() {
JNIEnv* env = JavaVMHelper::getJNIEnv();
env->DeleteGlobalRef(mDataSourceCallbackObj);
env->DeleteGlobalRef(mByteArrayObj);
}
status_t JDataSourceCallback::initCheck() const {
return OK;
}
ssize_t JDataSourceCallback::readAt(off64_t offset, void *data, size_t size) {
Mutex::Autolock lock(mLock);
if (mJavaObjStatus != OK) {
return -1;
}
if (size > kBufferSize) {
size = kBufferSize;
}
JNIEnv* env = JavaVMHelper::getJNIEnv();
jint numread = env->CallIntMethod(mDataSourceCallbackObj, mReadAtMethod,
(jlong)offset, mByteArrayObj, (jint)0, (jint)size);
if (env->ExceptionCheck()) {
ALOGW("An exception occurred in readAt()");
jniLogException(env, ANDROID_LOG_WARN, LOG_TAG);
env->ExceptionClear();
mJavaObjStatus = UNKNOWN_ERROR;
return -1;
}
if (numread < 0) {
if (numread != -1) {
ALOGW("An error occurred in readAt()");
mJavaObjStatus = UNKNOWN_ERROR;
return -1;
} else {
// numread == -1 indicates EOF
return 0;
}
}
if ((size_t)numread > size) {
ALOGE("readAt read too many bytes.");
mJavaObjStatus = UNKNOWN_ERROR;
return -1;
}
ALOGV("readAt %lld / %zu => %d.", (long long)offset, size, numread);
env->GetByteArrayRegion(mByteArrayObj, 0, numread, (jbyte*)data);
return numread;
}
status_t JDataSourceCallback::getSize(off64_t* size) {
Mutex::Autolock lock(mLock);
if (mJavaObjStatus != OK) {
return UNKNOWN_ERROR;
}
if (mSizeIsCached) {
*size = mCachedSize;
return OK;
}
JNIEnv* env = JavaVMHelper::getJNIEnv();
*size = env->CallLongMethod(mDataSourceCallbackObj, mGetSizeMethod);
if (env->ExceptionCheck()) {
ALOGW("An exception occurred in getSize()");
jniLogException(env, ANDROID_LOG_WARN, LOG_TAG);
env->ExceptionClear();
// After returning an error, size shouldn't be used by callers.
*size = UNKNOWN_ERROR;
mJavaObjStatus = UNKNOWN_ERROR;
return UNKNOWN_ERROR;
}
// The minimum size should be -1, which indicates unknown size.
if (*size < 0) {
*size = -1;
}
mCachedSize = *size;
mSizeIsCached = true;
return OK;
}
void JDataSourceCallback::close() {
Mutex::Autolock lock(mLock);
JNIEnv* env = JavaVMHelper::getJNIEnv();
env->CallVoidMethod(mDataSourceCallbackObj, mCloseMethod);
// The closed state is effectively the same as an error state.
mJavaObjStatus = UNKNOWN_ERROR;
}
String8 JDataSourceCallback::toString() {
return String8::format("JDataSourceCallback(pid %d, uid %d)", getpid(), getuid());
}
String8 JDataSourceCallback::getMIMEType() const {
return String8("application/octet-stream");
}
} // namespace android
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