android_media_AudioRecord.cpp revision a9838afbe3ef58b63e5d52060d5ff2776c1c603a 
1/*
2 * Copyright (C) 2008 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
19#define LOG_TAG "AudioRecord-JNI"
20
21#include <jni.h>
22#include <JNIHelp.h>
23#include <android_runtime/AndroidRuntime.h>
24
25#include <utils/Log.h>
26#include <media/AudioRecord.h>
27
28#include <system/audio.h>
29
30// ----------------------------------------------------------------------------
31
32using namespace android;
33
34// ----------------------------------------------------------------------------
35static const char* const kClassPathName = "android/media/AudioRecord";
36
37struct fields_t {
38    // these fields provide access from C++ to the...
39    jmethodID postNativeEventInJava; //... event post callback method
40    jfieldID  nativeRecorderInJavaObj; // provides access to the C++ AudioRecord object
41    jfieldID  nativeCallbackCookie;    // provides access to the AudioRecord callback data
42};
43static fields_t javaAudioRecordFields;
44
45struct audiorecord_callback_cookie {
46    jclass      audioRecord_class;
47    jobject     audioRecord_ref;
48    bool        busy;
49    Condition   cond;
50};
51
52// keep these values in sync with AudioFormat.java
53#define ENCODING_PCM_16BIT 2
54#define ENCODING_PCM_8BIT  3
55
56static Mutex sLock;
57static SortedVector <audiorecord_callback_cookie *> sAudioRecordCallBackCookies;
58
59// ----------------------------------------------------------------------------
60
61#define AUDIORECORD_SUCCESS                         0
62#define AUDIORECORD_ERROR                           -1
63#define AUDIORECORD_ERROR_BAD_VALUE                 -2
64#define AUDIORECORD_ERROR_INVALID_OPERATION         -3
65#define AUDIORECORD_ERROR_SETUP_ZEROFRAMECOUNT      -16
66#define AUDIORECORD_ERROR_SETUP_INVALIDCHANNELMASK -17
67#define AUDIORECORD_ERROR_SETUP_INVALIDFORMAT       -18
68#define AUDIORECORD_ERROR_SETUP_INVALIDSOURCE       -19
69#define AUDIORECORD_ERROR_SETUP_NATIVEINITFAILED    -20
70
71jint android_media_translateRecorderErrorCode(int code) {
72    switch (code) {
73    case NO_ERROR:
74        return AUDIORECORD_SUCCESS;
75    case BAD_VALUE:
76        return AUDIORECORD_ERROR_BAD_VALUE;
77    case INVALID_OPERATION:
78        return AUDIORECORD_ERROR_INVALID_OPERATION;
79    default:
80        return AUDIORECORD_ERROR;
81    }
82}
83
84
85// ----------------------------------------------------------------------------
86static void recorderCallback(int event, void* user, void *info) {
87
88    audiorecord_callback_cookie *callbackInfo = (audiorecord_callback_cookie *)user;
89    {
90        Mutex::Autolock l(sLock);
91        if (sAudioRecordCallBackCookies.indexOf(callbackInfo) < 0) {
92            return;
93        }
94        callbackInfo->busy = true;
95    }
96
97    switch (event) {
98    case AudioRecord::EVENT_MARKER: {
99        JNIEnv *env = AndroidRuntime::getJNIEnv();
100        if (user != NULL && env != NULL) {
101            env->CallStaticVoidMethod(
102                callbackInfo->audioRecord_class,
103                javaAudioRecordFields.postNativeEventInJava,
104                callbackInfo->audioRecord_ref, event, 0,0, NULL);
105            if (env->ExceptionCheck()) {
106                env->ExceptionDescribe();
107                env->ExceptionClear();
108            }
109        }
110        } break;
111
112    case AudioRecord::EVENT_NEW_POS: {
113        JNIEnv *env = AndroidRuntime::getJNIEnv();
114        if (user != NULL && env != NULL) {
115            env->CallStaticVoidMethod(
116                callbackInfo->audioRecord_class,
117                javaAudioRecordFields.postNativeEventInJava,
118                callbackInfo->audioRecord_ref, event, 0,0, NULL);
119            if (env->ExceptionCheck()) {
120                env->ExceptionDescribe();
121                env->ExceptionClear();
122            }
123        }
124        } break;
125    }
126
127    {
128        Mutex::Autolock l(sLock);
129        callbackInfo->busy = false;
130        callbackInfo->cond.broadcast();
131    }
132}
133
134// ----------------------------------------------------------------------------
135static sp<AudioRecord> getAudioRecord(JNIEnv* env, jobject thiz)
136{
137    Mutex::Autolock l(sLock);
138    AudioRecord* const ar =
139            (AudioRecord*)env->GetIntField(thiz, javaAudioRecordFields.nativeRecorderInJavaObj);
140    return sp<AudioRecord>(ar);
141}
142
143static sp<AudioRecord> setAudioRecord(JNIEnv* env, jobject thiz, const sp<AudioRecord>& ar)
144{
145    Mutex::Autolock l(sLock);
146    sp<AudioRecord> old =
147            (AudioRecord*)env->GetIntField(thiz, javaAudioRecordFields.nativeRecorderInJavaObj);
148    if (ar.get()) {
149        ar->incStrong((void*)setAudioRecord);
150    }
151    if (old != 0) {
152        old->decStrong((void*)setAudioRecord);
153    }
154    env->SetIntField(thiz, javaAudioRecordFields.nativeRecorderInJavaObj, (int)ar.get());
155    return old;
156}
157
158// ----------------------------------------------------------------------------
159static int
160android_media_AudioRecord_setup(JNIEnv *env, jobject thiz, jobject weak_this,
161        jint source, jint sampleRateInHertz, jint channelMask,
162                // Java channel masks map directly to the native definition
163        jint audioFormat, jint buffSizeInBytes, jintArray jSession)
164{
165    //ALOGV(">> Entering android_media_AudioRecord_setup");
166    //ALOGV("sampleRate=%d, audioFormat=%d, channel mask=%x, buffSizeInBytes=%d",
167    //     sampleRateInHertz, audioFormat, channelMask, buffSizeInBytes);
168
169    if (!audio_is_input_channel(channelMask)) {
170        ALOGE("Error creating AudioRecord: channel mask %#x is not valid.", channelMask);
171        return AUDIORECORD_ERROR_SETUP_INVALIDCHANNELMASK;
172    }
173    uint32_t nbChannels = popcount(channelMask);
174
175    // compare the format against the Java constants
176    if ((audioFormat != ENCODING_PCM_16BIT)
177        && (audioFormat != ENCODING_PCM_8BIT)) {
178        ALOGE("Error creating AudioRecord: unsupported audio format %d.", audioFormat);
179        return AUDIORECORD_ERROR_SETUP_INVALIDFORMAT;
180    }
181
182    int bytesPerSample = audioFormat == ENCODING_PCM_16BIT ? 2 : 1;
183    audio_format_t format = audioFormat == ENCODING_PCM_16BIT ?
184            AUDIO_FORMAT_PCM_16_BIT : AUDIO_FORMAT_PCM_8_BIT;
185
186    if (buffSizeInBytes == 0) {
187         ALOGE("Error creating AudioRecord: frameCount is 0.");
188        return AUDIORECORD_ERROR_SETUP_ZEROFRAMECOUNT;
189    }
190    int frameSize = nbChannels * bytesPerSample;
191    size_t frameCount = buffSizeInBytes / frameSize;
192
193    if ((uint32_t(source) >= AUDIO_SOURCE_CNT) && (uint32_t(source) != AUDIO_SOURCE_HOTWORD)) {
194        ALOGE("Error creating AudioRecord: unknown source %d.", source);
195        return AUDIORECORD_ERROR_SETUP_INVALIDSOURCE;
196    }
197
198    jclass clazz = env->GetObjectClass(thiz);
199    if (clazz == NULL) {
200        ALOGE("Can't find %s when setting up callback.", kClassPathName);
201        return AUDIORECORD_ERROR_SETUP_NATIVEINITFAILED;
202    }
203
204    if (jSession == NULL) {
205        ALOGE("Error creating AudioRecord: invalid session ID pointer");
206        return AUDIORECORD_ERROR;
207    }
208
209    jint* nSession = (jint *) env->GetPrimitiveArrayCritical(jSession, NULL);
210    if (nSession == NULL) {
211        ALOGE("Error creating AudioRecord: Error retrieving session id pointer");
212        return AUDIORECORD_ERROR;
213    }
214    int sessionId = nSession[0];
215    env->ReleasePrimitiveArrayCritical(jSession, nSession, 0);
216    nSession = NULL;
217
218    // create an uninitialized AudioRecord object
219    sp<AudioRecord> lpRecorder = new AudioRecord();
220
221    // create the callback information:
222    // this data will be passed with every AudioRecord callback
223    audiorecord_callback_cookie *lpCallbackData = new audiorecord_callback_cookie;
224    lpCallbackData->audioRecord_class = (jclass)env->NewGlobalRef(clazz);
225    // we use a weak reference so the AudioRecord object can be garbage collected.
226    lpCallbackData->audioRecord_ref = env->NewGlobalRef(weak_this);
227    lpCallbackData->busy = false;
228
229    lpRecorder->set((audio_source_t) source,
230        sampleRateInHertz,
231        format,        // word length, PCM
232        channelMask,
233        frameCount,
234        recorderCallback,// callback_t
235        lpCallbackData,// void* user
236        0,             // notificationFrames,
237        true,          // threadCanCallJava
238        sessionId);
239
240    const status_t status = lpRecorder->initCheck();
241    if (status != NO_ERROR) {
242        ALOGE("Error creating AudioRecord instance: initialization check failed with status %d.",
243                status);
244        goto native_init_failure;
245    }
246
247    nSession = (jint *) env->GetPrimitiveArrayCritical(jSession, NULL);
248    if (nSession == NULL) {
249        ALOGE("Error creating AudioRecord: Error retrieving session id pointer");
250        goto native_init_failure;
251    }
252    // read the audio session ID back from AudioRecord in case a new session was created during set()
253    nSession[0] = lpRecorder->getSessionId();
254    env->ReleasePrimitiveArrayCritical(jSession, nSession, 0);
255    nSession = NULL;
256
257    {   // scope for the lock
258        Mutex::Autolock l(sLock);
259        sAudioRecordCallBackCookies.add(lpCallbackData);
260    }
261    // save our newly created C++ AudioRecord in the "nativeRecorderInJavaObj" field
262    // of the Java object
263    setAudioRecord(env, thiz, lpRecorder);
264
265    // save our newly created callback information in the "nativeCallbackCookie" field
266    // of the Java object (in mNativeCallbackCookie) so we can free the memory in finalize()
267    env->SetIntField(thiz, javaAudioRecordFields.nativeCallbackCookie, (int)lpCallbackData);
268
269    return AUDIORECORD_SUCCESS;
270
271    // failure:
272native_init_failure:
273    env->DeleteGlobalRef(lpCallbackData->audioRecord_class);
274    env->DeleteGlobalRef(lpCallbackData->audioRecord_ref);
275    delete lpCallbackData;
276    env->SetIntField(thiz, javaAudioRecordFields.nativeCallbackCookie, 0);
277
278    return AUDIORECORD_ERROR_SETUP_NATIVEINITFAILED;
279}
280
281
282
283// ----------------------------------------------------------------------------
284static int
285android_media_AudioRecord_start(JNIEnv *env, jobject thiz, jint event, jint triggerSession)
286{
287    sp<AudioRecord> lpRecorder = getAudioRecord(env, thiz);
288    if (lpRecorder == NULL ) {
289        jniThrowException(env, "java/lang/IllegalStateException", NULL);
290        return AUDIORECORD_ERROR;
291    }
292
293    return android_media_translateRecorderErrorCode(
294            lpRecorder->start((AudioSystem::sync_event_t)event, triggerSession));
295}
296
297
298// ----------------------------------------------------------------------------
299static void
300android_media_AudioRecord_stop(JNIEnv *env, jobject thiz)
301{
302    sp<AudioRecord> lpRecorder = getAudioRecord(env, thiz);
303    if (lpRecorder == NULL ) {
304        jniThrowException(env, "java/lang/IllegalStateException", NULL);
305        return;
306    }
307
308    lpRecorder->stop();
309    //ALOGV("Called lpRecorder->stop()");
310}
311
312
313// ----------------------------------------------------------------------------
314
315#define CALLBACK_COND_WAIT_TIMEOUT_MS 1000
316static void android_media_AudioRecord_release(JNIEnv *env,  jobject thiz) {
317    sp<AudioRecord> lpRecorder = setAudioRecord(env, thiz, 0);
318    if (lpRecorder == NULL) {
319        return;
320    }
321    ALOGV("About to delete lpRecorder: %x\n", (int)lpRecorder.get());
322    lpRecorder->stop();
323
324    audiorecord_callback_cookie *lpCookie = (audiorecord_callback_cookie *)env->GetIntField(
325        thiz, javaAudioRecordFields.nativeCallbackCookie);
326
327    // reset the native resources in the Java object so any attempt to access
328    // them after a call to release fails.
329    env->SetIntField(thiz, javaAudioRecordFields.nativeCallbackCookie, 0);
330
331    // delete the callback information
332    if (lpCookie) {
333        Mutex::Autolock l(sLock);
334        ALOGV("deleting lpCookie: %x\n", (int)lpCookie);
335        while (lpCookie->busy) {
336            if (lpCookie->cond.waitRelative(sLock,
337                                            milliseconds(CALLBACK_COND_WAIT_TIMEOUT_MS)) !=
338                                                    NO_ERROR) {
339                break;
340            }
341        }
342        sAudioRecordCallBackCookies.remove(lpCookie);
343        env->DeleteGlobalRef(lpCookie->audioRecord_class);
344        env->DeleteGlobalRef(lpCookie->audioRecord_ref);
345        delete lpCookie;
346    }
347}
348
349
350// ----------------------------------------------------------------------------
351static void android_media_AudioRecord_finalize(JNIEnv *env,  jobject thiz) {
352    android_media_AudioRecord_release(env, thiz);
353}
354
355
356// ----------------------------------------------------------------------------
357static jint android_media_AudioRecord_readInByteArray(JNIEnv *env,  jobject thiz,
358                                                        jbyteArray javaAudioData,
359                                                        jint offsetInBytes, jint sizeInBytes) {
360    jbyte* recordBuff = NULL;
361    // get the audio recorder from which we'll read new audio samples
362    sp<AudioRecord> lpRecorder = getAudioRecord(env, thiz);
363    if (lpRecorder == NULL) {
364        ALOGE("Unable to retrieve AudioRecord object, can't record");
365        return 0;
366    }
367
368    if (!javaAudioData) {
369        ALOGE("Invalid Java array to store recorded audio, can't record");
370        return 0;
371    }
372
373    // get the pointer to where we'll record the audio
374    // NOTE: We may use GetPrimitiveArrayCritical() when the JNI implementation changes in such
375    // a way that it becomes much more efficient. When doing so, we will have to prevent the
376    // AudioSystem callback to be called while in critical section (in case of media server
377    // process crash for instance)
378    recordBuff = (jbyte *)env->GetByteArrayElements(javaAudioData, NULL);
379
380    if (recordBuff == NULL) {
381        ALOGE("Error retrieving destination for recorded audio data, can't record");
382        return 0;
383    }
384
385    // read the new audio data from the native AudioRecord object
386    ssize_t recorderBuffSize = lpRecorder->frameCount()*lpRecorder->frameSize();
387    ssize_t readSize = lpRecorder->read(recordBuff + offsetInBytes,
388                                        sizeInBytes > (jint)recorderBuffSize ?
389                                            (jint)recorderBuffSize : sizeInBytes );
390    env->ReleaseByteArrayElements(javaAudioData, recordBuff, 0);
391
392    if (readSize < 0) {
393        readSize = AUDIORECORD_ERROR_INVALID_OPERATION;
394    }
395    return (jint) readSize;
396}
397
398// ----------------------------------------------------------------------------
399static jint android_media_AudioRecord_readInShortArray(JNIEnv *env,  jobject thiz,
400                                                        jshortArray javaAudioData,
401                                                        jint offsetInShorts, jint sizeInShorts) {
402
403    jint read = android_media_AudioRecord_readInByteArray(env, thiz,
404                                                        (jbyteArray) javaAudioData,
405                                                        offsetInShorts*2, sizeInShorts*2);
406    if (read > 0) {
407        read /= 2;
408    }
409    return read;
410}
411
412// ----------------------------------------------------------------------------
413static jint android_media_AudioRecord_readInDirectBuffer(JNIEnv *env,  jobject thiz,
414                                                  jobject jBuffer, jint sizeInBytes) {
415    // get the audio recorder from which we'll read new audio samples
416    sp<AudioRecord> lpRecorder = getAudioRecord(env, thiz);
417    if (lpRecorder==NULL)
418        return 0;
419
420    // direct buffer and direct access supported?
421    long capacity = env->GetDirectBufferCapacity(jBuffer);
422    if (capacity == -1) {
423        // buffer direct access is not supported
424        ALOGE("Buffer direct access is not supported, can't record");
425        return 0;
426    }
427    //ALOGV("capacity = %ld", capacity);
428    jbyte* nativeFromJavaBuf = (jbyte*) env->GetDirectBufferAddress(jBuffer);
429    if (nativeFromJavaBuf==NULL) {
430        ALOGE("Buffer direct access is not supported, can't record");
431        return 0;
432    }
433
434    // read new data from the recorder
435    ssize_t readSize = lpRecorder->read(nativeFromJavaBuf,
436                                   capacity < sizeInBytes ? capacity : sizeInBytes);
437    if (readSize < 0) {
438        readSize = AUDIORECORD_ERROR_INVALID_OPERATION;
439    }
440    return (jint)readSize;
441}
442
443
444// ----------------------------------------------------------------------------
445static jint android_media_AudioRecord_set_marker_pos(JNIEnv *env,  jobject thiz,
446        jint markerPos) {
447
448    sp<AudioRecord> lpRecorder = getAudioRecord(env, thiz);
449    if (lpRecorder == NULL) {
450        jniThrowException(env, "java/lang/IllegalStateException",
451            "Unable to retrieve AudioRecord pointer for setMarkerPosition()");
452        return AUDIORECORD_ERROR;
453    }
454    return android_media_translateRecorderErrorCode( lpRecorder->setMarkerPosition(markerPos) );
455}
456
457
458// ----------------------------------------------------------------------------
459static jint android_media_AudioRecord_get_marker_pos(JNIEnv *env,  jobject thiz) {
460
461    sp<AudioRecord> lpRecorder = getAudioRecord(env, thiz);
462    uint32_t markerPos = 0;
463
464    if (lpRecorder == NULL) {
465        jniThrowException(env, "java/lang/IllegalStateException",
466            "Unable to retrieve AudioRecord pointer for getMarkerPosition()");
467        return AUDIORECORD_ERROR;
468    }
469    lpRecorder->getMarkerPosition(&markerPos);
470    return (jint)markerPos;
471}
472
473
474// ----------------------------------------------------------------------------
475static jint android_media_AudioRecord_set_pos_update_period(JNIEnv *env,  jobject thiz,
476        jint period) {
477
478    sp<AudioRecord> lpRecorder = getAudioRecord(env, thiz);
479
480    if (lpRecorder == NULL) {
481        jniThrowException(env, "java/lang/IllegalStateException",
482            "Unable to retrieve AudioRecord pointer for setPositionUpdatePeriod()");
483        return AUDIORECORD_ERROR;
484    }
485    return android_media_translateRecorderErrorCode( lpRecorder->setPositionUpdatePeriod(period) );
486}
487
488
489// ----------------------------------------------------------------------------
490static jint android_media_AudioRecord_get_pos_update_period(JNIEnv *env,  jobject thiz) {
491
492    sp<AudioRecord> lpRecorder = getAudioRecord(env, thiz);
493    uint32_t period = 0;
494
495    if (lpRecorder == NULL) {
496        jniThrowException(env, "java/lang/IllegalStateException",
497            "Unable to retrieve AudioRecord pointer for getPositionUpdatePeriod()");
498        return AUDIORECORD_ERROR;
499    }
500    lpRecorder->getPositionUpdatePeriod(&period);
501    return (jint)period;
502}
503
504
505// ----------------------------------------------------------------------------
506// returns the minimum required size for the successful creation of an AudioRecord instance.
507// returns 0 if the parameter combination is not supported.
508// return -1 if there was an error querying the buffer size.
509static jint android_media_AudioRecord_get_min_buff_size(JNIEnv *env,  jobject thiz,
510    jint sampleRateInHertz, jint nbChannels, jint audioFormat) {
511
512    ALOGV(">> android_media_AudioRecord_get_min_buff_size(%d, %d, %d)",
513          sampleRateInHertz, nbChannels, audioFormat);
514
515    size_t frameCount = 0;
516    status_t result = AudioRecord::getMinFrameCount(&frameCount,
517            sampleRateInHertz,
518            (audioFormat == ENCODING_PCM_16BIT ?
519                AUDIO_FORMAT_PCM_16_BIT : AUDIO_FORMAT_PCM_8_BIT),
520            audio_channel_in_mask_from_count(nbChannels));
521
522    if (result == BAD_VALUE) {
523        return 0;
524    }
525    if (result != NO_ERROR) {
526        return -1;
527    }
528    return frameCount * nbChannels * (audioFormat == ENCODING_PCM_16BIT ? 2 : 1);
529}
530
531
532// ----------------------------------------------------------------------------
533// ----------------------------------------------------------------------------
534static JNINativeMethod gMethods[] = {
535    // name,               signature,  funcPtr
536    {"native_start",         "(II)I",    (void *)android_media_AudioRecord_start},
537    {"native_stop",          "()V",    (void *)android_media_AudioRecord_stop},
538    {"native_setup",         "(Ljava/lang/Object;IIIII[I)I",
539                                       (void *)android_media_AudioRecord_setup},
540    {"native_finalize",      "()V",    (void *)android_media_AudioRecord_finalize},
541    {"native_release",       "()V",    (void *)android_media_AudioRecord_release},
542    {"native_read_in_byte_array",
543                             "([BII)I", (void *)android_media_AudioRecord_readInByteArray},
544    {"native_read_in_short_array",
545                             "([SII)I", (void *)android_media_AudioRecord_readInShortArray},
546    {"native_read_in_direct_buffer","(Ljava/lang/Object;I)I",
547                                       (void *)android_media_AudioRecord_readInDirectBuffer},
548    {"native_set_marker_pos","(I)I",   (void *)android_media_AudioRecord_set_marker_pos},
549    {"native_get_marker_pos","()I",    (void *)android_media_AudioRecord_get_marker_pos},
550    {"native_set_pos_update_period",
551                             "(I)I",   (void *)android_media_AudioRecord_set_pos_update_period},
552    {"native_get_pos_update_period",
553                             "()I",    (void *)android_media_AudioRecord_get_pos_update_period},
554    {"native_get_min_buff_size",
555                             "(III)I",   (void *)android_media_AudioRecord_get_min_buff_size},
556};
557
558// field names found in android/media/AudioRecord.java
559#define JAVA_POSTEVENT_CALLBACK_NAME  "postEventFromNative"
560#define JAVA_NATIVERECORDERINJAVAOBJ_FIELD_NAME  "mNativeRecorderInJavaObj"
561#define JAVA_NATIVECALLBACKINFO_FIELD_NAME       "mNativeCallbackCookie"
562
563// ----------------------------------------------------------------------------
564int register_android_media_AudioRecord(JNIEnv *env)
565{
566    javaAudioRecordFields.postNativeEventInJava = NULL;
567    javaAudioRecordFields.nativeRecorderInJavaObj = NULL;
568    javaAudioRecordFields.nativeCallbackCookie = NULL;
569
570
571    // Get the AudioRecord class
572    jclass audioRecordClass = env->FindClass(kClassPathName);
573    if (audioRecordClass == NULL) {
574        ALOGE("Can't find %s", kClassPathName);
575        return -1;
576    }
577    // Get the postEvent method
578    javaAudioRecordFields.postNativeEventInJava = env->GetStaticMethodID(
579            audioRecordClass,
580            JAVA_POSTEVENT_CALLBACK_NAME, "(Ljava/lang/Object;IIILjava/lang/Object;)V");
581    if (javaAudioRecordFields.postNativeEventInJava == NULL) {
582        ALOGE("Can't find AudioRecord.%s", JAVA_POSTEVENT_CALLBACK_NAME);
583        return -1;
584    }
585
586    // Get the variables
587    //    mNativeRecorderInJavaObj
588    javaAudioRecordFields.nativeRecorderInJavaObj =
589        env->GetFieldID(audioRecordClass,
590                        JAVA_NATIVERECORDERINJAVAOBJ_FIELD_NAME, "I");
591    if (javaAudioRecordFields.nativeRecorderInJavaObj == NULL) {
592        ALOGE("Can't find AudioRecord.%s", JAVA_NATIVERECORDERINJAVAOBJ_FIELD_NAME);
593        return -1;
594    }
595    //     mNativeCallbackCookie
596    javaAudioRecordFields.nativeCallbackCookie = env->GetFieldID(
597            audioRecordClass,
598            JAVA_NATIVECALLBACKINFO_FIELD_NAME, "I");
599    if (javaAudioRecordFields.nativeCallbackCookie == NULL) {
600        ALOGE("Can't find AudioRecord.%s", JAVA_NATIVECALLBACKINFO_FIELD_NAME);
601        return -1;
602    }
603
604    return AndroidRuntime::registerNativeMethods(env,
605            kClassPathName, gMethods, NELEM(gMethods));
606}
607
608// ----------------------------------------------------------------------------
609