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()->unsecurePointer());
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