Chris Watkins | 4eaa293 | 2015-03-20 10:31:42 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2015, The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | //#define LOG_NDEBUG 0 |
| 18 | #define LOG_TAG "JMediaDataSource-JNI" |
| 19 | #include <utils/Log.h> |
| 20 | |
| 21 | #include "android_media_MediaDataSource.h" |
| 22 | |
| 23 | #include "android_runtime/AndroidRuntime.h" |
| 24 | #include "android_runtime/Log.h" |
| 25 | #include "jni.h" |
| 26 | #include "JNIHelp.h" |
| 27 | |
| 28 | #include <binder/MemoryDealer.h> |
| 29 | #include <media/stagefright/foundation/ADebug.h> |
| 30 | #include <nativehelper/ScopedLocalRef.h> |
| 31 | |
| 32 | namespace android { |
| 33 | |
| 34 | JMediaDataSource::JMediaDataSource(JNIEnv* env, jobject source) |
| 35 | : mJavaObjStatus(OK), mSizeIsCached(false), mCachedSize(0), mMemory(NULL) { |
| 36 | mMediaDataSourceObj = env->NewGlobalRef(source); |
| 37 | CHECK(mMediaDataSourceObj != NULL); |
| 38 | |
| 39 | ScopedLocalRef<jclass> mediaDataSourceClass(env, env->GetObjectClass(mMediaDataSourceObj)); |
| 40 | CHECK(mediaDataSourceClass.get() != NULL); |
| 41 | |
| 42 | mReadMethod = env->GetMethodID(mediaDataSourceClass.get(), "readAt", "(J[BI)I"); |
| 43 | CHECK(mReadMethod != NULL); |
| 44 | mGetSizeMethod = env->GetMethodID(mediaDataSourceClass.get(), "getSize", "()J"); |
| 45 | CHECK(mGetSizeMethod != NULL); |
| 46 | mCloseMethod = env->GetMethodID(mediaDataSourceClass.get(), "close", "()V"); |
| 47 | CHECK(mCloseMethod != NULL); |
| 48 | |
| 49 | ScopedLocalRef<jbyteArray> tmp(env, env->NewByteArray(kBufferSize)); |
| 50 | mByteArrayObj = (jbyteArray)env->NewGlobalRef(tmp.get()); |
| 51 | CHECK(mByteArrayObj != NULL); |
| 52 | |
| 53 | sp<MemoryDealer> memoryDealer = new MemoryDealer(kBufferSize, "JMediaDataSource"); |
| 54 | mMemory = memoryDealer->allocate(kBufferSize); |
| 55 | if (mMemory == NULL) { |
| 56 | ALOGE("Failed to allocate memory!"); |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | JMediaDataSource::~JMediaDataSource() { |
| 61 | JNIEnv* env = AndroidRuntime::getJNIEnv(); |
| 62 | env->DeleteGlobalRef(mMediaDataSourceObj); |
| 63 | env->DeleteGlobalRef(mByteArrayObj); |
| 64 | } |
| 65 | |
| 66 | sp<IMemory> JMediaDataSource::getIMemory() { |
| 67 | Mutex::Autolock lock(mLock); |
| 68 | return mMemory; |
| 69 | } |
| 70 | |
| 71 | ssize_t JMediaDataSource::readAt(off64_t offset, size_t size) { |
| 72 | Mutex::Autolock lock(mLock); |
| 73 | |
| 74 | if (mJavaObjStatus != OK || mMemory == NULL) { |
| 75 | return -1; |
| 76 | } |
| 77 | if (size > kBufferSize) { |
| 78 | size = kBufferSize; |
| 79 | } |
| 80 | |
| 81 | JNIEnv* env = AndroidRuntime::getJNIEnv(); |
| 82 | jint numread = env->CallIntMethod(mMediaDataSourceObj, mReadMethod, |
| 83 | (jlong)offset, mByteArrayObj, (jint)size); |
| 84 | if (env->ExceptionCheck()) { |
| 85 | ALOGW("An exception occurred in readAt()"); |
| 86 | LOGW_EX(env); |
| 87 | env->ExceptionClear(); |
| 88 | mJavaObjStatus = UNKNOWN_ERROR; |
| 89 | return -1; |
| 90 | } |
| 91 | if (numread < 0) { |
| 92 | ALOGW("An error occurred in readAt()"); |
| 93 | mJavaObjStatus = UNKNOWN_ERROR; |
| 94 | return -1; |
| 95 | } |
| 96 | if ((size_t)numread > size) { |
| 97 | ALOGE("readAt read too many bytes."); |
| 98 | mJavaObjStatus = UNKNOWN_ERROR; |
| 99 | return -1; |
| 100 | } |
| 101 | |
| 102 | ALOGV("readAt %lld / %zu => %d.", (long long)offset, size, numread); |
| 103 | env->GetByteArrayRegion(mByteArrayObj, 0, numread, (jbyte*)mMemory->pointer()); |
| 104 | return numread; |
| 105 | } |
| 106 | |
| 107 | status_t JMediaDataSource::getSize(off64_t* size) { |
| 108 | Mutex::Autolock lock(mLock); |
| 109 | |
| 110 | if (mJavaObjStatus != OK) { |
| 111 | return UNKNOWN_ERROR; |
| 112 | } |
| 113 | if (mSizeIsCached) { |
| 114 | return mCachedSize; |
| 115 | } |
| 116 | |
| 117 | JNIEnv* env = AndroidRuntime::getJNIEnv(); |
| 118 | *size = env->CallLongMethod(mMediaDataSourceObj, mGetSizeMethod); |
| 119 | if (env->ExceptionCheck()) { |
| 120 | ALOGW("An exception occurred in getSize()"); |
| 121 | LOGW_EX(env); |
| 122 | env->ExceptionClear(); |
| 123 | // After returning an error, size shouldn't be used by callers. |
| 124 | *size = UNKNOWN_ERROR; |
| 125 | mJavaObjStatus = UNKNOWN_ERROR; |
| 126 | return UNKNOWN_ERROR; |
| 127 | } |
| 128 | |
| 129 | // The minimum size should be -1, which indicates unknown size. |
| 130 | if (*size < 0) { |
| 131 | *size = -1; |
| 132 | } |
| 133 | |
| 134 | mCachedSize = *size; |
| 135 | mSizeIsCached = true; |
| 136 | return OK; |
| 137 | } |
| 138 | |
| 139 | void JMediaDataSource::close() { |
| 140 | Mutex::Autolock lock(mLock); |
| 141 | |
| 142 | JNIEnv* env = AndroidRuntime::getJNIEnv(); |
| 143 | env->CallVoidMethod(mMediaDataSourceObj, mCloseMethod); |
| 144 | // The closed state is effectively the same as an error state. |
| 145 | mJavaObjStatus = UNKNOWN_ERROR; |
| 146 | } |
| 147 | |
| 148 | } // namespace android |