| /* |
| * Copyright 2015, 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 "JMediaDataSource-JNI" |
| #include <utils/Log.h> |
| |
| #include "android_media_MediaDataSource.h" |
| |
| #include "android_runtime/AndroidRuntime.h" |
| #include "android_runtime/Log.h" |
| #include "jni.h" |
| #include "JNIHelp.h" |
| |
| #include <binder/MemoryDealer.h> |
| #include <media/stagefright/foundation/ADebug.h> |
| #include <nativehelper/ScopedLocalRef.h> |
| |
| namespace android { |
| |
| JMediaDataSource::JMediaDataSource(JNIEnv* env, jobject source) |
| : mJavaObjStatus(OK), mSizeIsCached(false), mCachedSize(0), mMemory(NULL) { |
| mMediaDataSourceObj = env->NewGlobalRef(source); |
| CHECK(mMediaDataSourceObj != NULL); |
| |
| ScopedLocalRef<jclass> mediaDataSourceClass(env, env->GetObjectClass(mMediaDataSourceObj)); |
| CHECK(mediaDataSourceClass.get() != NULL); |
| |
| mReadMethod = env->GetMethodID(mediaDataSourceClass.get(), "readAt", "(J[BII)I"); |
| CHECK(mReadMethod != NULL); |
| mGetSizeMethod = env->GetMethodID(mediaDataSourceClass.get(), "getSize", "()J"); |
| CHECK(mGetSizeMethod != NULL); |
| mCloseMethod = env->GetMethodID(mediaDataSourceClass.get(), "close", "()V"); |
| CHECK(mCloseMethod != NULL); |
| |
| ScopedLocalRef<jbyteArray> tmp(env, env->NewByteArray(kBufferSize)); |
| mByteArrayObj = (jbyteArray)env->NewGlobalRef(tmp.get()); |
| CHECK(mByteArrayObj != NULL); |
| |
| sp<MemoryDealer> memoryDealer = new MemoryDealer(kBufferSize, "JMediaDataSource"); |
| mMemory = memoryDealer->allocate(kBufferSize); |
| if (mMemory == NULL) { |
| ALOGE("Failed to allocate memory!"); |
| } |
| } |
| |
| JMediaDataSource::~JMediaDataSource() { |
| JNIEnv* env = AndroidRuntime::getJNIEnv(); |
| env->DeleteGlobalRef(mMediaDataSourceObj); |
| env->DeleteGlobalRef(mByteArrayObj); |
| } |
| |
| sp<IMemory> JMediaDataSource::getIMemory() { |
| Mutex::Autolock lock(mLock); |
| return mMemory; |
| } |
| |
| ssize_t JMediaDataSource::readAt(off64_t offset, size_t size) { |
| Mutex::Autolock lock(mLock); |
| |
| if (mJavaObjStatus != OK || mMemory == NULL) { |
| return -1; |
| } |
| if (size > kBufferSize) { |
| size = kBufferSize; |
| } |
| |
| JNIEnv* env = AndroidRuntime::getJNIEnv(); |
| jint numread = env->CallIntMethod(mMediaDataSourceObj, mReadMethod, |
| (jlong)offset, mByteArrayObj, (jint)0, (jint)size); |
| if (env->ExceptionCheck()) { |
| ALOGW("An exception occurred in readAt()"); |
| LOGW_EX(env); |
| 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*)mMemory->pointer()); |
| return numread; |
| } |
| |
| status_t JMediaDataSource::getSize(off64_t* size) { |
| Mutex::Autolock lock(mLock); |
| |
| if (mJavaObjStatus != OK) { |
| return UNKNOWN_ERROR; |
| } |
| if (mSizeIsCached) { |
| return mCachedSize; |
| } |
| |
| JNIEnv* env = AndroidRuntime::getJNIEnv(); |
| *size = env->CallLongMethod(mMediaDataSourceObj, mGetSizeMethod); |
| if (env->ExceptionCheck()) { |
| ALOGW("An exception occurred in getSize()"); |
| LOGW_EX(env); |
| 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 JMediaDataSource::close() { |
| Mutex::Autolock lock(mLock); |
| |
| JNIEnv* env = AndroidRuntime::getJNIEnv(); |
| env->CallVoidMethod(mMediaDataSourceObj, mCloseMethod); |
| // The closed state is effectively the same as an error state. |
| mJavaObjStatus = UNKNOWN_ERROR; |
| } |
| |
| } // namespace android |