android_media_Utils.cpp revision 5c850396b39a57baabd37a9c0c8324f1bee408ca 
1/*
2 * Copyright 2011, 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 "AndroidMediaUtils"
19
20#include <utils/Log.h>
21#include "android_media_Utils.h"
22
23#include <media/stagefright/foundation/ADebug.h>
24#include <media/stagefright/foundation/ABuffer.h>
25#include <media/stagefright/foundation/AMessage.h>
26
27namespace android {
28
29bool ConvertKeyValueArraysToKeyedVector(
30        JNIEnv *env, jobjectArray keys, jobjectArray values,
31        KeyedVector<String8, String8>* keyedVector) {
32
33    int nKeyValuePairs = 0;
34    bool failed = false;
35    if (keys != NULL && values != NULL) {
36        nKeyValuePairs = env->GetArrayLength(keys);
37        failed = (nKeyValuePairs != env->GetArrayLength(values));
38    }
39
40    if (!failed) {
41        failed = ((keys != NULL && values == NULL) ||
42                  (keys == NULL && values != NULL));
43    }
44
45    if (failed) {
46        ALOGE("keys and values arrays have different length");
47        jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
48        return false;
49    }
50
51    for (int i = 0; i < nKeyValuePairs; ++i) {
52        // No need to check on the ArrayIndexOutOfBoundsException, since
53        // it won't happen here.
54        jstring key = (jstring) env->GetObjectArrayElement(keys, i);
55        jstring value = (jstring) env->GetObjectArrayElement(values, i);
56
57        const char* keyStr = env->GetStringUTFChars(key, NULL);
58        if (!keyStr) {  // OutOfMemoryError
59            return false;
60        }
61
62        const char* valueStr = env->GetStringUTFChars(value, NULL);
63        if (!valueStr) {  // OutOfMemoryError
64            env->ReleaseStringUTFChars(key, keyStr);
65            return false;
66        }
67
68        keyedVector->add(String8(keyStr), String8(valueStr));
69
70        env->ReleaseStringUTFChars(key, keyStr);
71        env->ReleaseStringUTFChars(value, valueStr);
72        env->DeleteLocalRef(key);
73        env->DeleteLocalRef(value);
74    }
75    return true;
76}
77
78static jobject makeIntegerObject(JNIEnv *env, int32_t value) {
79    jclass clazz = env->FindClass("java/lang/Integer");
80    CHECK(clazz != NULL);
81
82    jmethodID integerConstructID = env->GetMethodID(clazz, "<init>", "(I)V");
83    CHECK(integerConstructID != NULL);
84
85    return env->NewObject(clazz, integerConstructID, value);
86}
87
88static jobject makeFloatObject(JNIEnv *env, float value) {
89    jclass clazz = env->FindClass("java/lang/Float");
90    CHECK(clazz != NULL);
91
92    jmethodID floatConstructID = env->GetMethodID(clazz, "<init>", "(F)V");
93    CHECK(floatConstructID != NULL);
94
95    return env->NewObject(clazz, floatConstructID, value);
96}
97
98static jobject makeByteBufferObject(
99        JNIEnv *env, const void *data, size_t size) {
100    jbyteArray byteArrayObj = env->NewByteArray(size);
101    env->SetByteArrayRegion(byteArrayObj, 0, size, (const jbyte *)data);
102
103    jclass clazz = env->FindClass("java/nio/ByteBuffer");
104    CHECK(clazz != NULL);
105
106    jmethodID byteBufWrapID =
107        env->GetStaticMethodID(clazz, "wrap", "([B)Ljava/nio/ByteBuffer;");
108    CHECK(byteBufWrapID != NULL);
109
110    jobject byteBufObj = env->CallStaticObjectMethod(
111            clazz, byteBufWrapID, byteArrayObj);
112
113    env->DeleteLocalRef(byteArrayObj); byteArrayObj = NULL;
114
115    return byteBufObj;
116}
117
118status_t ConvertMessageToMap(
119        JNIEnv *env, const sp<AMessage> &msg, jobject *map) {
120    jclass hashMapClazz = env->FindClass("java/util/HashMap");
121
122    if (hashMapClazz == NULL) {
123        return -EINVAL;
124    }
125
126    jmethodID hashMapConstructID =
127        env->GetMethodID(hashMapClazz, "<init>", "()V");
128
129    if (hashMapConstructID == NULL) {
130        return -EINVAL;
131    }
132
133    jmethodID hashMapPutID =
134        env->GetMethodID(
135                hashMapClazz,
136                "put",
137                "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;");
138
139    if (hashMapPutID == NULL) {
140        return -EINVAL;
141    }
142
143    jobject hashMap = env->NewObject(hashMapClazz, hashMapConstructID);
144
145    for (size_t i = 0; i < msg->countEntries(); ++i) {
146        AMessage::Type valueType;
147        const char *key = msg->getEntryNameAt(i, &valueType);
148
149        jobject valueObj = NULL;
150
151        switch (valueType) {
152            case AMessage::kTypeInt32:
153            {
154                int32_t val;
155                CHECK(msg->findInt32(key, &val));
156
157                valueObj = makeIntegerObject(env, val);
158                break;
159            }
160
161            case AMessage::kTypeFloat:
162            {
163                float val;
164                CHECK(msg->findFloat(key, &val));
165
166                valueObj = makeFloatObject(env, val);
167                break;
168            }
169
170            case AMessage::kTypeString:
171            {
172                AString val;
173                CHECK(msg->findString(key, &val));
174
175                valueObj = env->NewStringUTF(val.c_str());
176                break;
177            }
178
179            case AMessage::kTypeBuffer:
180            {
181                sp<ABuffer> buffer;
182                CHECK(msg->findBuffer(key, &buffer));
183
184                valueObj = makeByteBufferObject(
185                        env, buffer->data(), buffer->size());
186                break;
187            }
188
189            default:
190                break;
191        }
192
193        if (valueObj != NULL) {
194            jstring keyObj = env->NewStringUTF(key);
195
196            jobject res = env->CallObjectMethod(
197                    hashMap, hashMapPutID, keyObj, valueObj);
198
199            env->DeleteLocalRef(keyObj); keyObj = NULL;
200            env->DeleteLocalRef(valueObj); valueObj = NULL;
201        }
202    }
203
204    *map = hashMap;
205
206    return OK;
207}
208
209status_t ConvertKeyValueArraysToMessage(
210        JNIEnv *env, jobjectArray keys, jobjectArray values,
211        sp<AMessage> *out) {
212    jclass stringClass = env->FindClass("java/lang/String");
213    CHECK(stringClass != NULL);
214
215    jclass integerClass = env->FindClass("java/lang/Integer");
216    CHECK(integerClass != NULL);
217
218    jclass floatClass = env->FindClass("java/lang/Float");
219    CHECK(floatClass != NULL);
220
221    jclass byteBufClass = env->FindClass("java/nio/ByteBuffer");
222    CHECK(byteBufClass != NULL);
223
224    sp<AMessage> msg = new AMessage;
225
226    jsize numEntries = 0;
227
228    if (keys != NULL) {
229        if (values == NULL) {
230            return -EINVAL;
231        }
232
233        numEntries = env->GetArrayLength(keys);
234
235        if (numEntries != env->GetArrayLength(values)) {
236            return -EINVAL;
237        }
238    } else if (values != NULL) {
239        return -EINVAL;
240    }
241
242    for (jsize i = 0; i < numEntries; ++i) {
243        jobject keyObj = env->GetObjectArrayElement(keys, i);
244
245        if (!env->IsInstanceOf(keyObj, stringClass)) {
246            return -EINVAL;
247        }
248
249        const char *tmp = env->GetStringUTFChars((jstring)keyObj, NULL);
250
251        if (tmp == NULL) {
252            return -ENOMEM;
253        }
254
255        AString key = tmp;
256
257        env->ReleaseStringUTFChars((jstring)keyObj, tmp);
258        tmp = NULL;
259
260        jobject valueObj = env->GetObjectArrayElement(values, i);
261
262        if (env->IsInstanceOf(valueObj, stringClass)) {
263            const char *value = env->GetStringUTFChars((jstring)valueObj, NULL);
264
265            if (value == NULL) {
266                return -ENOMEM;
267            }
268
269            msg->setString(key.c_str(), value);
270
271            env->ReleaseStringUTFChars((jstring)valueObj, value);
272            value = NULL;
273        } else if (env->IsInstanceOf(valueObj, integerClass)) {
274            jmethodID intValueID =
275                env->GetMethodID(integerClass, "intValue", "()I");
276            CHECK(intValueID != NULL);
277
278            jint value = env->CallIntMethod(valueObj, intValueID);
279
280            msg->setInt32(key.c_str(), value);
281        } else if (env->IsInstanceOf(valueObj, floatClass)) {
282            jmethodID floatValueID =
283                env->GetMethodID(floatClass, "floatValue", "()F");
284            CHECK(floatValueID != NULL);
285
286            jfloat value = env->CallFloatMethod(valueObj, floatValueID);
287
288            msg->setFloat(key.c_str(), value);
289        } else if (env->IsInstanceOf(valueObj, byteBufClass)) {
290            jmethodID positionID =
291                env->GetMethodID(byteBufClass, "position", "()I");
292            CHECK(positionID != NULL);
293
294            jmethodID limitID =
295                env->GetMethodID(byteBufClass, "limit", "()I");
296            CHECK(limitID != NULL);
297
298            jint position = env->CallIntMethod(valueObj, positionID);
299            jint limit = env->CallIntMethod(valueObj, limitID);
300
301            sp<ABuffer> buffer = new ABuffer(limit - position);
302
303            void *data = env->GetDirectBufferAddress(valueObj);
304
305            if (data != NULL) {
306                memcpy(buffer->data(),
307                       (const uint8_t *)data + position,
308                       buffer->size());
309            } else {
310                jmethodID arrayID =
311                    env->GetMethodID(byteBufClass, "array", "()[B");
312                CHECK(arrayID != NULL);
313
314                jbyteArray byteArray =
315                    (jbyteArray)env->CallObjectMethod(valueObj, arrayID);
316                CHECK(byteArray != NULL);
317
318                env->GetByteArrayRegion(
319                        byteArray,
320                        position,
321                        buffer->size(),
322                        (jbyte *)buffer->data());
323
324                env->DeleteLocalRef(byteArray); byteArray = NULL;
325            }
326
327            msg->setObject(key.c_str(), buffer);
328        }
329    }
330
331    *out = msg;
332
333    return OK;
334}
335
336}  // namespace android
337
338