android_media_MediaHTTPConnection.cpp revision dce97407dcf54ae9725c2d29224f6ed8dfd994b8 
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 "JNIHelp.h"
31
32namespace android {
33
34JMediaHTTPConnection::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
53JMediaHTTPConnection::~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
64sp<IMemory> JMediaHTTPConnection::getIMemory() {
65    return mMemory;
66}
67
68jbyteArray JMediaHTTPConnection::getByteArrayObj() {
69    return mByteArrayObj;
70}
71
72}  // namespace android
73
74using namespace android;
75
76struct fields_t {
77    jfieldID context;
78
79    jmethodID readAtMethodID;
80};
81
82static fields_t gFields;
83
84static 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
100static sp<JMediaHTTPConnection> getObject(JNIEnv *env, jobject thiz) {
101    return (JMediaHTTPConnection *)env->GetLongField(thiz, gFields.context);
102}
103
104static 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
115static 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
122static void android_media_MediaHTTPConnection_native_finalize(
123        JNIEnv *env, jobject thiz) {
124    setObject(env, thiz, NULL);
125}
126
127static 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
134static jint android_media_MediaHTTPConnection_native_readAt(
135        JNIEnv *env, jobject thiz, jlong offset, jint size) {
136    sp<JMediaHTTPConnection> conn = getObject(env, thiz);
137
138    if (size > JMediaHTTPConnection::kBufferSize) {
139        size = JMediaHTTPConnection::kBufferSize;
140    }
141
142    jbyteArray byteArrayObj = conn->getByteArrayObj();
143
144    jint n = env->CallIntMethod(
145            thiz, gFields.readAtMethodID, offset, byteArrayObj, size);
146
147    if (n > 0) {
148        env->GetByteArrayRegion(
149                byteArrayObj,
150                0,
151                n,
152                (jbyte *)conn->getIMemory()->pointer());
153    }
154
155    return n;
156}
157
158static JNINativeMethod gMethods[] = {
159    { "native_getIMemory", "()Landroid/os/IBinder;",
160      (void *)android_media_MediaHTTPConnection_native_getIMemory },
161
162    { "native_readAt", "(JI)I",
163      (void *)android_media_MediaHTTPConnection_native_readAt },
164
165    { "native_init", "()V",
166      (void *)android_media_MediaHTTPConnection_native_init },
167
168    { "native_setup", "()V",
169      (void *)android_media_MediaHTTPConnection_native_setup },
170
171    { "native_finalize", "()V",
172      (void *)android_media_MediaHTTPConnection_native_finalize },
173};
174
175int register_android_media_MediaHTTPConnection(JNIEnv *env) {
176    return AndroidRuntime::registerNativeMethods(env,
177                "android/media/MediaHTTPConnection", gMethods, NELEM(gMethods));
178}
179
180