android_media_Utils.cpp revision 07ea426e3ae8915ca6bf67135f523f42cd920af0 
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 makeLongObject(JNIEnv *env, int64_t value) {
89    jclass clazz = env->FindClass("java/lang/Long");
90    CHECK(clazz != NULL);
91
92    jmethodID longConstructID = env->GetMethodID(clazz, "<init>", "(J)V");
93    CHECK(longConstructID != NULL);
94
95    return env->NewObject(clazz, longConstructID, value);
96}
97
98static jobject makeFloatObject(JNIEnv *env, float value) {
99    jclass clazz = env->FindClass("java/lang/Float");
100    CHECK(clazz != NULL);
101
102    jmethodID floatConstructID = env->GetMethodID(clazz, "<init>", "(F)V");
103    CHECK(floatConstructID != NULL);
104
105    return env->NewObject(clazz, floatConstructID, value);
106}
107
108static jobject makeByteBufferObject(
109        JNIEnv *env, const void *data, size_t size) {
110    jbyteArray byteArrayObj = env->NewByteArray(size);
111    env->SetByteArrayRegion(byteArrayObj, 0, size, (const jbyte *)data);
112
113    jclass clazz = env->FindClass("java/nio/ByteBuffer");
114    CHECK(clazz != NULL);
115
116    jmethodID byteBufWrapID =
117        env->GetStaticMethodID(clazz, "wrap", "([B)Ljava/nio/ByteBuffer;");
118    CHECK(byteBufWrapID != NULL);
119
120    jobject byteBufObj = env->CallStaticObjectMethod(
121            clazz, byteBufWrapID, byteArrayObj);
122
123    env->DeleteLocalRef(byteArrayObj); byteArrayObj = NULL;
124
125    return byteBufObj;
126}
127
128status_t ConvertMessageToMap(
129        JNIEnv *env, const sp<AMessage> &msg, jobject *map) {
130    jclass hashMapClazz = env->FindClass("java/util/HashMap");
131
132    if (hashMapClazz == NULL) {
133        return -EINVAL;
134    }
135
136    jmethodID hashMapConstructID =
137        env->GetMethodID(hashMapClazz, "<init>", "()V");
138
139    if (hashMapConstructID == NULL) {
140        return -EINVAL;
141    }
142
143    jmethodID hashMapPutID =
144        env->GetMethodID(
145                hashMapClazz,
146                "put",
147                "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;");
148
149    if (hashMapPutID == NULL) {
150        return -EINVAL;
151    }
152
153    jobject hashMap = env->NewObject(hashMapClazz, hashMapConstructID);
154
155    for (size_t i = 0; i < msg->countEntries(); ++i) {
156        AMessage::Type valueType;
157        const char *key = msg->getEntryNameAt(i, &valueType);
158
159        jobject valueObj = NULL;
160
161        switch (valueType) {
162            case AMessage::kTypeInt32:
163            {
164                int32_t val;
165                CHECK(msg->findInt32(key, &val));
166
167                valueObj = makeIntegerObject(env, val);
168                break;
169            }
170
171            case AMessage::kTypeInt64:
172            {
173                int64_t val;
174                CHECK(msg->findInt64(key, &val));
175
176                valueObj = makeLongObject(env, val);
177                break;
178            }
179
180            case AMessage::kTypeFloat:
181            {
182                float val;
183                CHECK(msg->findFloat(key, &val));
184
185                valueObj = makeFloatObject(env, val);
186                break;
187            }
188
189            case AMessage::kTypeString:
190            {
191                AString val;
192                CHECK(msg->findString(key, &val));
193
194                valueObj = env->NewStringUTF(val.c_str());
195                break;
196            }
197
198            case AMessage::kTypeBuffer:
199            {
200                sp<ABuffer> buffer;
201                CHECK(msg->findBuffer(key, &buffer));
202
203                valueObj = makeByteBufferObject(
204                        env, buffer->data(), buffer->size());
205                break;
206            }
207
208            default:
209                break;
210        }
211
212        if (valueObj != NULL) {
213            jstring keyObj = env->NewStringUTF(key);
214
215            jobject res = env->CallObjectMethod(
216                    hashMap, hashMapPutID, keyObj, valueObj);
217
218            env->DeleteLocalRef(keyObj); keyObj = NULL;
219            env->DeleteLocalRef(valueObj); valueObj = NULL;
220        }
221    }
222
223    *map = hashMap;
224
225    return OK;
226}
227
228status_t ConvertKeyValueArraysToMessage(
229        JNIEnv *env, jobjectArray keys, jobjectArray values,
230        sp<AMessage> *out) {
231    jclass stringClass = env->FindClass("java/lang/String");
232    CHECK(stringClass != NULL);
233
234    jclass integerClass = env->FindClass("java/lang/Integer");
235    CHECK(integerClass != NULL);
236
237    jclass floatClass = env->FindClass("java/lang/Float");
238    CHECK(floatClass != NULL);
239
240    jclass byteBufClass = env->FindClass("java/nio/ByteBuffer");
241    CHECK(byteBufClass != NULL);
242
243    sp<AMessage> msg = new AMessage;
244
245    jsize numEntries = 0;
246
247    if (keys != NULL) {
248        if (values == NULL) {
249            return -EINVAL;
250        }
251
252        numEntries = env->GetArrayLength(keys);
253
254        if (numEntries != env->GetArrayLength(values)) {
255            return -EINVAL;
256        }
257    } else if (values != NULL) {
258        return -EINVAL;
259    }
260
261    for (jsize i = 0; i < numEntries; ++i) {
262        jobject keyObj = env->GetObjectArrayElement(keys, i);
263
264        if (!env->IsInstanceOf(keyObj, stringClass)) {
265            return -EINVAL;
266        }
267
268        const char *tmp = env->GetStringUTFChars((jstring)keyObj, NULL);
269
270        if (tmp == NULL) {
271            return -ENOMEM;
272        }
273
274        AString key = tmp;
275
276        env->ReleaseStringUTFChars((jstring)keyObj, tmp);
277        tmp = NULL;
278
279        jobject valueObj = env->GetObjectArrayElement(values, i);
280
281        if (env->IsInstanceOf(valueObj, stringClass)) {
282            const char *value = env->GetStringUTFChars((jstring)valueObj, NULL);
283
284            if (value == NULL) {
285                return -ENOMEM;
286            }
287
288            msg->setString(key.c_str(), value);
289
290            env->ReleaseStringUTFChars((jstring)valueObj, value);
291            value = NULL;
292        } else if (env->IsInstanceOf(valueObj, integerClass)) {
293            jmethodID intValueID =
294                env->GetMethodID(integerClass, "intValue", "()I");
295            CHECK(intValueID != NULL);
296
297            jint value = env->CallIntMethod(valueObj, intValueID);
298
299            msg->setInt32(key.c_str(), value);
300        } else if (env->IsInstanceOf(valueObj, floatClass)) {
301            jmethodID floatValueID =
302                env->GetMethodID(floatClass, "floatValue", "()F");
303            CHECK(floatValueID != NULL);
304
305            jfloat value = env->CallFloatMethod(valueObj, floatValueID);
306
307            msg->setFloat(key.c_str(), value);
308        } else if (env->IsInstanceOf(valueObj, byteBufClass)) {
309            jmethodID positionID =
310                env->GetMethodID(byteBufClass, "position", "()I");
311            CHECK(positionID != NULL);
312
313            jmethodID limitID =
314                env->GetMethodID(byteBufClass, "limit", "()I");
315            CHECK(limitID != NULL);
316
317            jint position = env->CallIntMethod(valueObj, positionID);
318            jint limit = env->CallIntMethod(valueObj, limitID);
319
320            sp<ABuffer> buffer = new ABuffer(limit - position);
321
322            void *data = env->GetDirectBufferAddress(valueObj);
323
324            if (data != NULL) {
325                memcpy(buffer->data(),
326                       (const uint8_t *)data + position,
327                       buffer->size());
328            } else {
329                jmethodID arrayID =
330                    env->GetMethodID(byteBufClass, "array", "()[B");
331                CHECK(arrayID != NULL);
332
333                jbyteArray byteArray =
334                    (jbyteArray)env->CallObjectMethod(valueObj, arrayID);
335                CHECK(byteArray != NULL);
336
337                env->GetByteArrayRegion(
338                        byteArray,
339                        position,
340                        buffer->size(),
341                        (jbyte *)buffer->data());
342
343                env->DeleteLocalRef(byteArray); byteArray = NULL;
344            }
345
346            msg->setBuffer(key.c_str(), buffer);
347        }
348    }
349
350    *out = msg;
351
352    return OK;
353}
354
355}  // namespace android
356
357