1 /*
2  * Copyright 2013, 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 "MediaHTTPConnection-JNI"
19 #include <utils/Log.h>
20 
21 #include <binder/MemoryDealer.h>
22 #include <media/stagefright/foundation/ADebug.h>
23 #include <nativehelper/ScopedLocalRef.h>
24 
25 #include "android_media_MediaHTTPConnection.h"
26 #include "android_util_Binder.h"
27 
28 #include "android_runtime/AndroidRuntime.h"
29 #include "jni.h"
30 #include <nativehelper/JNIHelp.h>
31 
32 namespace android {
33 
JMediaHTTPConnection(JNIEnv * env,jobject thiz)34 JMediaHTTPConnection::JMediaHTTPConnection(JNIEnv *env, jobject thiz)
35     : mClass(NULL),
36       mObject(NULL),
37       mByteArrayObj(NULL) {
38     jclass clazz = env->GetObjectClass(thiz);
39     CHECK(clazz != NULL);
40 
41     mClass = (jclass)env->NewGlobalRef(clazz);
42     mObject = env->NewWeakGlobalRef(thiz);
43 
44     mDealer = new MemoryDealer(kBufferSize, "MediaHTTPConnection");
45     mMemory = mDealer->allocate(kBufferSize);
46 
47     ScopedLocalRef<jbyteArray> tmp(
48             env, env->NewByteArray(JMediaHTTPConnection::kBufferSize));
49 
50     mByteArrayObj = (jbyteArray)env->NewGlobalRef(tmp.get());
51 }
52 
~JMediaHTTPConnection()53 JMediaHTTPConnection::~JMediaHTTPConnection() {
54     JNIEnv *env = AndroidRuntime::getJNIEnv();
55 
56     env->DeleteGlobalRef(mByteArrayObj);
57     mByteArrayObj = NULL;
58     env->DeleteWeakGlobalRef(mObject);
59     mObject = NULL;
60     env->DeleteGlobalRef(mClass);
61     mClass = NULL;
62 }
63 
getIMemory()64 sp<IMemory> JMediaHTTPConnection::getIMemory() {
65     return mMemory;
66 }
67 
getByteArrayObj()68 jbyteArray JMediaHTTPConnection::getByteArrayObj() {
69     return mByteArrayObj;
70 }
71 
72 }  // namespace android
73 
74 using namespace android;
75 
76 struct fields_t {
77     jfieldID context;
78 
79     jmethodID readAtMethodID;
80 };
81 
82 static fields_t gFields;
83 
setObject(JNIEnv * env,jobject thiz,const sp<JMediaHTTPConnection> & conn)84 static sp<JMediaHTTPConnection> setObject(
85         JNIEnv *env, jobject thiz, const sp<JMediaHTTPConnection> &conn) {
86     sp<JMediaHTTPConnection> old =
87         (JMediaHTTPConnection *)env->GetLongField(thiz, gFields.context);
88 
89     if (conn != NULL) {
90         conn->incStrong(thiz);
91     }
92     if (old != NULL) {
93         old->decStrong(thiz);
94     }
95     env->SetLongField(thiz, gFields.context, (jlong)conn.get());
96 
97     return old;
98 }
99 
getObject(JNIEnv * env,jobject thiz)100 static sp<JMediaHTTPConnection> getObject(JNIEnv *env, jobject thiz) {
101     return (JMediaHTTPConnection *)env->GetLongField(thiz, gFields.context);
102 }
103 
android_media_MediaHTTPConnection_native_init(JNIEnv * env)104 static void android_media_MediaHTTPConnection_native_init(JNIEnv *env) {
105     ScopedLocalRef<jclass> clazz(
106             env, env->FindClass("android/media/MediaHTTPConnection"));
107     CHECK(clazz.get() != NULL);
108 
109     gFields.context = env->GetFieldID(clazz.get(), "mNativeContext", "J");
110     CHECK(gFields.context != NULL);
111 
112     gFields.readAtMethodID = env->GetMethodID(clazz.get(), "readAt", "(J[BI)I");
113 }
114 
android_media_MediaHTTPConnection_native_setup(JNIEnv * env,jobject thiz)115 static void android_media_MediaHTTPConnection_native_setup(
116         JNIEnv *env, jobject thiz) {
117     sp<JMediaHTTPConnection> conn = new JMediaHTTPConnection(env, thiz);
118 
119     setObject(env, thiz, conn);
120 }
121 
android_media_MediaHTTPConnection_native_finalize(JNIEnv * env,jobject thiz)122 static void android_media_MediaHTTPConnection_native_finalize(
123         JNIEnv *env, jobject thiz) {
124     setObject(env, thiz, NULL);
125 }
126 
android_media_MediaHTTPConnection_native_getIMemory(JNIEnv * env,jobject thiz)127 static jobject android_media_MediaHTTPConnection_native_getIMemory(
128         JNIEnv *env, jobject thiz) {
129     sp<JMediaHTTPConnection> conn = getObject(env, thiz);
130 
131     return javaObjectForIBinder(env, IInterface::asBinder(conn->getIMemory()));
132 }
133 
android_media_MediaHTTPConnection_native_readAt(JNIEnv * env,jobject thiz,jlong offset,jint size)134 static jint android_media_MediaHTTPConnection_native_readAt(
135         JNIEnv *env, jobject thiz, jlong offset, jint size) {
136     sp<JMediaHTTPConnection> conn = getObject(env, thiz);
137     if (size > JMediaHTTPConnection::kBufferSize) {
138         size = JMediaHTTPConnection::kBufferSize;
139     }
140 
141     jbyteArray byteArrayObj = conn->getByteArrayObj();
142 
143     jint n = env->CallIntMethod(
144             thiz, gFields.readAtMethodID, offset, byteArrayObj, size);
145 
146     if (n > 0) {
147         env->GetByteArrayRegion(
148                 byteArrayObj,
149                 0,
150                 n,
151                 (jbyte *)conn->getIMemory()->pointer());
152     }
153 
154     return n;
155 }
156 
157 static const JNINativeMethod gMethods[] = {
158     { "native_getIMemory", "()Landroid/os/IBinder;",
159       (void *)android_media_MediaHTTPConnection_native_getIMemory },
160 
161     { "native_readAt", "(JI)I",
162       (void *)android_media_MediaHTTPConnection_native_readAt },
163 
164     { "native_init", "()V",
165       (void *)android_media_MediaHTTPConnection_native_init },
166 
167     { "native_setup", "()V",
168       (void *)android_media_MediaHTTPConnection_native_setup },
169 
170     { "native_finalize", "()V",
171       (void *)android_media_MediaHTTPConnection_native_finalize },
172 };
173 
register_android_media_MediaHTTPConnection(JNIEnv * env)174 int register_android_media_MediaHTTPConnection(JNIEnv *env) {
175     return AndroidRuntime::registerNativeMethods(env,
176                 "android/media/MediaHTTPConnection", gMethods, NELEM(gMethods));
177 }
178 
179