Wei Jia | 0a8a8f0 | 2017-12-05 17:05:29 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2017, 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 "JMedia2DataSource-JNI" |
| 19 | #include <utils/Log.h> |
| 20 | |
| 21 | #include "android_media_Media2DataSource.h" |
| 22 | |
| 23 | #include "android_runtime/AndroidRuntime.h" |
| 24 | #include "android_runtime/Log.h" |
| 25 | #include "jni.h" |
| 26 | #include <nativehelper/JNIHelp.h> |
| 27 | |
| 28 | #include <drm/drm_framework_common.h> |
| 29 | #include <media/stagefright/foundation/ADebug.h> |
| 30 | #include <nativehelper/ScopedLocalRef.h> |
| 31 | |
| 32 | namespace android { |
| 33 | |
| 34 | static const size_t kBufferSize = 64 * 1024; |
| 35 | |
| 36 | JMedia2DataSource::JMedia2DataSource(JNIEnv* env, jobject source) |
| 37 | : mJavaObjStatus(OK), |
| 38 | mSizeIsCached(false), |
| 39 | mCachedSize(0) { |
| 40 | mMedia2DataSourceObj = env->NewGlobalRef(source); |
| 41 | CHECK(mMedia2DataSourceObj != NULL); |
| 42 | |
| 43 | ScopedLocalRef<jclass> media2DataSourceClass(env, env->GetObjectClass(mMedia2DataSourceObj)); |
| 44 | CHECK(media2DataSourceClass.get() != NULL); |
| 45 | |
| 46 | mReadAtMethod = env->GetMethodID(media2DataSourceClass.get(), "readAt", "(J[BII)I"); |
| 47 | CHECK(mReadAtMethod != NULL); |
| 48 | mGetSizeMethod = env->GetMethodID(media2DataSourceClass.get(), "getSize", "()J"); |
| 49 | CHECK(mGetSizeMethod != NULL); |
| 50 | mCloseMethod = env->GetMethodID(media2DataSourceClass.get(), "close", "()V"); |
| 51 | CHECK(mCloseMethod != NULL); |
| 52 | |
| 53 | ScopedLocalRef<jbyteArray> tmp(env, env->NewByteArray(kBufferSize)); |
| 54 | mByteArrayObj = (jbyteArray)env->NewGlobalRef(tmp.get()); |
| 55 | CHECK(mByteArrayObj != NULL); |
| 56 | } |
| 57 | |
| 58 | JMedia2DataSource::~JMedia2DataSource() { |
| 59 | JNIEnv* env = AndroidRuntime::getJNIEnv(); |
| 60 | env->DeleteGlobalRef(mMedia2DataSourceObj); |
| 61 | env->DeleteGlobalRef(mByteArrayObj); |
| 62 | } |
| 63 | |
| 64 | status_t JMedia2DataSource::initCheck() const { |
| 65 | return OK; |
| 66 | } |
| 67 | |
| 68 | ssize_t JMedia2DataSource::readAt(off64_t offset, void *data, size_t size) { |
| 69 | Mutex::Autolock lock(mLock); |
| 70 | |
| 71 | if (mJavaObjStatus != OK) { |
| 72 | return -1; |
| 73 | } |
| 74 | if (size > kBufferSize) { |
| 75 | size = kBufferSize; |
| 76 | } |
| 77 | |
| 78 | JNIEnv* env = AndroidRuntime::getJNIEnv(); |
| 79 | jint numread = env->CallIntMethod(mMedia2DataSourceObj, mReadAtMethod, |
| 80 | (jlong)offset, mByteArrayObj, (jint)0, (jint)size); |
| 81 | if (env->ExceptionCheck()) { |
| 82 | ALOGW("An exception occurred in readAt()"); |
| 83 | LOGW_EX(env); |
| 84 | env->ExceptionClear(); |
| 85 | mJavaObjStatus = UNKNOWN_ERROR; |
| 86 | return -1; |
| 87 | } |
| 88 | if (numread < 0) { |
| 89 | if (numread != -1) { |
| 90 | ALOGW("An error occurred in readAt()"); |
| 91 | mJavaObjStatus = UNKNOWN_ERROR; |
| 92 | return -1; |
| 93 | } else { |
| 94 | // numread == -1 indicates EOF |
| 95 | return 0; |
| 96 | } |
| 97 | } |
| 98 | if ((size_t)numread > size) { |
| 99 | ALOGE("readAt read too many bytes."); |
| 100 | mJavaObjStatus = UNKNOWN_ERROR; |
| 101 | return -1; |
| 102 | } |
| 103 | |
| 104 | ALOGV("readAt %lld / %zu => %d.", (long long)offset, size, numread); |
| 105 | env->GetByteArrayRegion(mByteArrayObj, 0, numread, (jbyte*)data); |
| 106 | return numread; |
| 107 | } |
| 108 | |
| 109 | status_t JMedia2DataSource::getSize(off64_t* size) { |
| 110 | Mutex::Autolock lock(mLock); |
| 111 | |
| 112 | if (mJavaObjStatus != OK) { |
| 113 | return UNKNOWN_ERROR; |
| 114 | } |
| 115 | if (mSizeIsCached) { |
| 116 | *size = mCachedSize; |
| 117 | return OK; |
| 118 | } |
| 119 | |
| 120 | JNIEnv* env = AndroidRuntime::getJNIEnv(); |
| 121 | *size = env->CallLongMethod(mMedia2DataSourceObj, mGetSizeMethod); |
| 122 | if (env->ExceptionCheck()) { |
| 123 | ALOGW("An exception occurred in getSize()"); |
| 124 | LOGW_EX(env); |
| 125 | env->ExceptionClear(); |
| 126 | // After returning an error, size shouldn't be used by callers. |
| 127 | *size = UNKNOWN_ERROR; |
| 128 | mJavaObjStatus = UNKNOWN_ERROR; |
| 129 | return UNKNOWN_ERROR; |
| 130 | } |
| 131 | |
| 132 | // The minimum size should be -1, which indicates unknown size. |
| 133 | if (*size < 0) { |
| 134 | *size = -1; |
| 135 | } |
| 136 | |
| 137 | mCachedSize = *size; |
| 138 | mSizeIsCached = true; |
| 139 | return OK; |
| 140 | } |
| 141 | |
| 142 | void JMedia2DataSource::close() { |
| 143 | Mutex::Autolock lock(mLock); |
| 144 | |
| 145 | JNIEnv* env = AndroidRuntime::getJNIEnv(); |
| 146 | env->CallVoidMethod(mMedia2DataSourceObj, mCloseMethod); |
| 147 | // The closed state is effectively the same as an error state. |
| 148 | mJavaObjStatus = UNKNOWN_ERROR; |
| 149 | } |
| 150 | |
| 151 | String8 JMedia2DataSource::toString() { |
| 152 | return String8::format("JMedia2DataSource(pid %d, uid %d)", getpid(), getuid()); |
| 153 | } |
| 154 | |
| 155 | String8 JMedia2DataSource::getMIMEType() const { |
| 156 | return String8("application/octet-stream"); |
| 157 | } |
| 158 | |
| 159 | } // namespace android |