android_media_MediaCrypto.cpp revision 60d610bf103379277a4b29a7ead4f013f6128e4e 
1/*
2 * Copyright 2012, 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 "MediaCrypto-JNI"
19#include <utils/Log.h>
20
21#include "android_media_MediaCrypto.h"
22
23#include "android_runtime/AndroidRuntime.h"
24#include "jni.h"
25#include "JNIHelp.h"
26
27#include <binder/IServiceManager.h>
28#include <media/ICrypto.h>
29#include <media/IMediaPlayerService.h>
30#include <media/stagefright/foundation/ADebug.h>
31
32namespace android {
33
34struct fields_t {
35    jfieldID context;
36};
37
38static fields_t gFields;
39
40static sp<JCrypto> getCrypto(JNIEnv *env, jobject thiz) {
41    return (JCrypto *)env->GetIntField(thiz, gFields.context);
42}
43
44JCrypto::JCrypto(
45        JNIEnv *env, jobject thiz,
46        const uint8_t uuid[16], const void *initData, size_t initSize) {
47    mObject = env->NewWeakGlobalRef(thiz);
48
49    mCrypto = MakeCrypto(uuid, initData, initSize);
50}
51
52JCrypto::~JCrypto() {
53    mCrypto.clear();
54
55    JNIEnv *env = AndroidRuntime::getJNIEnv();
56
57    env->DeleteWeakGlobalRef(mObject);
58    mObject = NULL;
59}
60
61// static
62sp<ICrypto> JCrypto::MakeCrypto() {
63    sp<IServiceManager> sm = defaultServiceManager();
64
65    sp<IBinder> binder =
66        sm->getService(String16("media.player"));
67
68    sp<IMediaPlayerService> service =
69        interface_cast<IMediaPlayerService>(binder);
70
71    if (service == NULL) {
72        return NULL;
73    }
74
75    sp<ICrypto> crypto = service->makeCrypto();
76
77    if (crypto == NULL || crypto->initCheck() != OK) {
78        return NULL;
79    }
80
81    return crypto;
82}
83
84// static
85sp<ICrypto> JCrypto::MakeCrypto(
86        const uint8_t uuid[16], const void *initData, size_t initSize) {
87    sp<ICrypto> crypto = MakeCrypto();
88
89    if (crypto == NULL) {
90        return NULL;
91    }
92
93    status_t err = crypto->createPlugin(uuid, initData, initSize);
94
95    if (err != OK) {
96        return NULL;
97    }
98
99    return crypto;
100}
101
102bool JCrypto::requiresSecureDecoderComponent(const char *mime) const {
103    if (mCrypto == NULL) {
104        return false;
105    }
106
107    return mCrypto->requiresSecureDecoderComponent(mime);
108}
109
110// static
111bool JCrypto::IsCryptoSchemeSupported(const uint8_t uuid[16]) {
112    sp<ICrypto> crypto = MakeCrypto();
113
114    if (crypto == NULL) {
115        return false;
116    }
117
118    return crypto->isCryptoSchemeSupported(uuid);
119}
120
121status_t JCrypto::initCheck() const {
122    return mCrypto == NULL ? NO_INIT : OK;
123}
124
125// static
126sp<ICrypto> JCrypto::GetCrypto(JNIEnv *env, jobject obj) {
127    jclass clazz = env->FindClass("android/media/MediaCrypto");
128    CHECK(clazz != NULL);
129
130    if (!env->IsInstanceOf(obj, clazz)) {
131        return NULL;
132    }
133
134    sp<JCrypto> jcrypto = getCrypto(env, obj);
135
136    if (jcrypto == NULL) {
137        return NULL;
138    }
139
140    return jcrypto->mCrypto;
141}
142
143}  // namespace android
144
145using namespace android;
146
147static sp<JCrypto> setCrypto(
148        JNIEnv *env, jobject thiz, const sp<JCrypto> &crypto) {
149    sp<JCrypto> old = (JCrypto *)env->GetIntField(thiz, gFields.context);
150    if (crypto != NULL) {
151        crypto->incStrong(thiz);
152    }
153    if (old != NULL) {
154        old->decStrong(thiz);
155    }
156    env->SetIntField(thiz, gFields.context, (int)crypto.get());
157
158    return old;
159}
160
161static void android_media_MediaCrypto_release(JNIEnv *env, jobject thiz) {
162    setCrypto(env, thiz, NULL);
163}
164
165static void android_media_MediaCrypto_native_init(JNIEnv *env) {
166    jclass clazz = env->FindClass("android/media/MediaCrypto");
167    CHECK(clazz != NULL);
168
169    gFields.context = env->GetFieldID(clazz, "mNativeContext", "I");
170    CHECK(gFields.context != NULL);
171}
172
173static void android_media_MediaCrypto_native_setup(
174        JNIEnv *env, jobject thiz,
175        jbyteArray uuidObj, jbyteArray initDataObj) {
176    jsize uuidLength = env->GetArrayLength(uuidObj);
177
178    if (uuidLength != 16) {
179        jniThrowException(
180                env,
181                "java/lang/IllegalArgumentException",
182                NULL);
183        return;
184    }
185
186    jboolean isCopy;
187    jbyte *uuid = env->GetByteArrayElements(uuidObj, &isCopy);
188
189    jsize initDataLength = 0;
190    jbyte *initData = NULL;
191
192    if (initDataObj != NULL) {
193        initDataLength = env->GetArrayLength(initDataObj);
194        initData = env->GetByteArrayElements(initDataObj, &isCopy);
195    }
196
197    sp<JCrypto> crypto = new JCrypto(
198            env, thiz, (const uint8_t *)uuid, initData, initDataLength);
199
200    status_t err = crypto->initCheck();
201
202    if (initDataObj != NULL) {
203        env->ReleaseByteArrayElements(initDataObj, initData, 0);
204        initData = NULL;
205    }
206
207    env->ReleaseByteArrayElements(uuidObj, uuid, 0);
208    uuid = NULL;
209
210    if (err != OK) {
211        jniThrowException(
212                env,
213                "android/media/MediaCryptoException",
214                "Failed to instantiate crypto object.");
215        return;
216    }
217
218    setCrypto(env,thiz, crypto);
219}
220
221static void android_media_MediaCrypto_native_finalize(
222        JNIEnv *env, jobject thiz) {
223    android_media_MediaCrypto_release(env, thiz);
224}
225
226static jboolean android_media_MediaCrypto_isCryptoSchemeSupportedNative(
227        JNIEnv *env, jobject thiz, jbyteArray uuidObj) {
228    jsize uuidLength = env->GetArrayLength(uuidObj);
229
230    if (uuidLength != 16) {
231        jniThrowException(
232                env,
233                "java/lang/IllegalArgumentException",
234                NULL);
235        return false;
236    }
237
238    jboolean isCopy;
239    jbyte *uuid = env->GetByteArrayElements(uuidObj, &isCopy);
240
241    bool result = JCrypto::IsCryptoSchemeSupported((const uint8_t *)uuid);
242
243    env->ReleaseByteArrayElements(uuidObj, uuid, 0);
244    uuid = NULL;
245
246    return result;
247}
248
249static jboolean android_media_MediaCrypto_requiresSecureDecoderComponent(
250        JNIEnv *env, jobject thiz, jstring mimeObj) {
251    if (mimeObj == NULL) {
252        jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
253        return false;
254    }
255
256    sp<JCrypto> crypto = getCrypto(env, thiz);
257
258    if (crypto == NULL) {
259        jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
260        return false;
261    }
262
263    const char *mime = env->GetStringUTFChars(mimeObj, NULL);
264
265    if (mime == NULL) {
266        return false;
267    }
268
269    bool result = crypto->requiresSecureDecoderComponent(mime);
270
271    env->ReleaseStringUTFChars(mimeObj, mime);
272    mime = NULL;
273
274    return result;
275}
276
277static JNINativeMethod gMethods[] = {
278    { "release", "()V", (void *)android_media_MediaCrypto_release },
279    { "native_init", "()V", (void *)android_media_MediaCrypto_native_init },
280
281    { "native_setup", "([B[B)V",
282      (void *)android_media_MediaCrypto_native_setup },
283
284    { "native_finalize", "()V",
285      (void *)android_media_MediaCrypto_native_finalize },
286
287    { "isCryptoSchemeSupportedNative", "([B)Z",
288      (void *)android_media_MediaCrypto_isCryptoSchemeSupportedNative },
289
290    { "requiresSecureDecoderComponent", "(Ljava/lang/String;)Z",
291      (void *)android_media_MediaCrypto_requiresSecureDecoderComponent },
292};
293
294int register_android_media_Crypto(JNIEnv *env) {
295    return AndroidRuntime::registerNativeMethods(env,
296                "android/media/MediaCrypto", gMethods, NELEM(gMethods));
297}
298
299