android_media_AudioRecord.cpp revision 86fad47e68e344b19fabeab1156c5e6742d8dfad 
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.");
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) {
194        ALOGE("Error creating AudioRecord: unknown 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    if (lpRecorder->initCheck() != NO_ERROR) {
241        ALOGE("Error creating AudioRecord instance: initialization check failed.");
242        goto native_init_failure;
243    }
244
245    nSession = (jint *) env->GetPrimitiveArrayCritical(jSession, NULL);
246    if (nSession == NULL) {
247        ALOGE("Error creating AudioRecord: Error retrieving session id pointer");
248        goto native_init_failure;
249    }
250    // read the audio session ID back from AudioRecord in case a new session was created during set()
251    nSession[0] = lpRecorder->getSessionId();
252    env->ReleasePrimitiveArrayCritical(jSession, nSession, 0);
253    nSession = NULL;
254
255    {   // scope for the lock
256        Mutex::Autolock l(sLock);
257        sAudioRecordCallBackCookies.add(lpCallbackData);
258    }
259    // save our newly created C++ AudioRecord in the "nativeRecorderInJavaObj" field
260    // of the Java object
261    setAudioRecord(env, thiz, lpRecorder);
262
263    // save our newly created callback information in the "nativeCallbackCookie" field
264    // of the Java object (in mNativeCallbackCookie) so we can free the memory in finalize()
265    env->SetIntField(thiz, javaAudioRecordFields.nativeCallbackCookie, (int)lpCallbackData);
266
267    return AUDIORECORD_SUCCESS;
268
269    // failure:
270native_init_failure:
271    env->DeleteGlobalRef(lpCallbackData->audioRecord_class);
272    env->DeleteGlobalRef(lpCallbackData->audioRecord_ref);
273    delete lpCallbackData;
274    env->SetIntField(thiz, javaAudioRecordFields.nativeCallbackCookie, 0);
275
276    return AUDIORECORD_ERROR_SETUP_NATIVEINITFAILED;
277}
278
279
280
281// ----------------------------------------------------------------------------
282static int
283android_media_AudioRecord_start(JNIEnv *env, jobject thiz, jint event, jint triggerSession)
284{
285    sp<AudioRecord> lpRecorder = getAudioRecord(env, thiz);
286    if (lpRecorder == NULL ) {
287        jniThrowException(env, "java/lang/IllegalStateException", NULL);
288        return AUDIORECORD_ERROR;
289    }
290
291    return android_media_translateRecorderErrorCode(
292            lpRecorder->start((AudioSystem::sync_event_t)event, triggerSession));
293}
294
295
296// ----------------------------------------------------------------------------
297static void
298android_media_AudioRecord_stop(JNIEnv *env, jobject thiz)
299{
300    sp<AudioRecord> lpRecorder = getAudioRecord(env, thiz);
301    if (lpRecorder == NULL ) {
302        jniThrowException(env, "java/lang/IllegalStateException", NULL);
303        return;
304    }
305
306    lpRecorder->stop();
307    //ALOGV("Called lpRecorder->stop()");
308}
309
310
311// ----------------------------------------------------------------------------
312
313#define CALLBACK_COND_WAIT_TIMEOUT_MS 1000
314static void android_media_AudioRecord_release(JNIEnv *env,  jobject thiz) {
315    sp<AudioRecord> lpRecorder = setAudioRecord(env, thiz, 0);
316    if (lpRecorder == NULL) {
317        return;
318    }
319    ALOGV("About to delete lpRecorder: %x\n", (int)lpRecorder.get());
320    lpRecorder->stop();
321
322    audiorecord_callback_cookie *lpCookie = (audiorecord_callback_cookie *)env->GetIntField(
323        thiz, javaAudioRecordFields.nativeCallbackCookie);
324
325    // reset the native resources in the Java object so any attempt to access
326    // them after a call to release fails.
327    env->SetIntField(thiz, javaAudioRecordFields.nativeCallbackCookie, 0);
328
329    // delete the callback information
330    if (lpCookie) {
331        Mutex::Autolock l(sLock);
332        ALOGV("deleting lpCookie: %x\n", (int)lpCookie);
333        while (lpCookie->busy) {
334            if (lpCookie->cond.waitRelative(sLock,
335                                            milliseconds(CALLBACK_COND_WAIT_TIMEOUT_MS)) !=
336                                                    NO_ERROR) {
337                break;
338            }
339        }
340        sAudioRecordCallBackCookies.remove(lpCookie);
341        env->DeleteGlobalRef(lpCookie->audioRecord_class);
342        env->DeleteGlobalRef(lpCookie->audioRecord_ref);
343        delete lpCookie;
344    }
345}
346
347
348// ----------------------------------------------------------------------------
349static void android_media_AudioRecord_finalize(JNIEnv *env,  jobject thiz) {
350    android_media_AudioRecord_release(env, thiz);
351}
352
353
354// ----------------------------------------------------------------------------
355static jint android_media_AudioRecord_readInByteArray(JNIEnv *env,  jobject thiz,
356                                                        jbyteArray javaAudioData,
357                                                        jint offsetInBytes, jint sizeInBytes) {
358    jbyte* recordBuff = NULL;
359    // get the audio recorder from which we'll read new audio samples
360    sp<AudioRecord> lpRecorder = getAudioRecord(env, thiz);
361    if (lpRecorder == NULL) {
362        ALOGE("Unable to retrieve AudioRecord object, can't record");
363        return 0;
364    }
365
366    if (!javaAudioData) {
367        ALOGE("Invalid Java array to store recorded audio, can't record");
368        return 0;
369    }
370
371    // get the pointer to where we'll record the audio
372    // NOTE: We may use GetPrimitiveArrayCritical() when the JNI implementation changes in such
373    // a way that it becomes much more efficient. When doing so, we will have to prevent the
374    // AudioSystem callback to be called while in critical section (in case of media server
375    // process crash for instance)
376    recordBuff = (jbyte *)env->GetByteArrayElements(javaAudioData, NULL);
377
378    if (recordBuff == NULL) {
379        ALOGE("Error retrieving destination for recorded audio data, can't record");
380        return 0;
381    }
382
383    // read the new audio data from the native AudioRecord object
384    ssize_t recorderBuffSize = lpRecorder->frameCount()*lpRecorder->frameSize();
385    ssize_t readSize = lpRecorder->read(recordBuff + offsetInBytes,
386                                        sizeInBytes > (jint)recorderBuffSize ?
387                                            (jint)recorderBuffSize : sizeInBytes );
388    env->ReleaseByteArrayElements(javaAudioData, recordBuff, 0);
389
390    return (jint) readSize;
391}
392
393// ----------------------------------------------------------------------------
394static jint android_media_AudioRecord_readInShortArray(JNIEnv *env,  jobject thiz,
395                                                        jshortArray javaAudioData,
396                                                        jint offsetInShorts, jint sizeInShorts) {
397
398    jint read = android_media_AudioRecord_readInByteArray(env, thiz,
399                                                        (jbyteArray) javaAudioData,
400                                                        offsetInShorts*2, sizeInShorts*2);
401    if (read > 0) {
402        read /= 2;
403    }
404    return read;
405}
406
407// ----------------------------------------------------------------------------
408static jint android_media_AudioRecord_readInDirectBuffer(JNIEnv *env,  jobject thiz,
409                                                  jobject jBuffer, jint sizeInBytes) {
410    // get the audio recorder from which we'll read new audio samples
411    sp<AudioRecord> lpRecorder = getAudioRecord(env, thiz);
412    if (lpRecorder==NULL)
413        return 0;
414
415    // direct buffer and direct access supported?
416    long capacity = env->GetDirectBufferCapacity(jBuffer);
417    if (capacity == -1) {
418        // buffer direct access is not supported
419        ALOGE("Buffer direct access is not supported, can't record");
420        return 0;
421    }
422    //ALOGV("capacity = %ld", capacity);
423    jbyte* nativeFromJavaBuf = (jbyte*) env->GetDirectBufferAddress(jBuffer);
424    if (nativeFromJavaBuf==NULL) {
425        ALOGE("Buffer direct access is not supported, can't record");
426        return 0;
427    }
428
429    // read new data from the recorder
430    return (jint) lpRecorder->read(nativeFromJavaBuf,
431                                   capacity < sizeInBytes ? capacity : sizeInBytes);
432}
433
434
435// ----------------------------------------------------------------------------
436static jint android_media_AudioRecord_set_marker_pos(JNIEnv *env,  jobject thiz,
437        jint markerPos) {
438
439    sp<AudioRecord> lpRecorder = getAudioRecord(env, thiz);
440    if (lpRecorder == NULL) {
441        jniThrowException(env, "java/lang/IllegalStateException",
442            "Unable to retrieve AudioRecord pointer for setMarkerPosition()");
443        return AUDIORECORD_ERROR;
444    }
445    return android_media_translateRecorderErrorCode( lpRecorder->setMarkerPosition(markerPos) );
446}
447
448
449// ----------------------------------------------------------------------------
450static jint android_media_AudioRecord_get_marker_pos(JNIEnv *env,  jobject thiz) {
451
452    sp<AudioRecord> lpRecorder = getAudioRecord(env, thiz);
453    uint32_t markerPos = 0;
454
455    if (lpRecorder == NULL) {
456        jniThrowException(env, "java/lang/IllegalStateException",
457            "Unable to retrieve AudioRecord pointer for getMarkerPosition()");
458        return AUDIORECORD_ERROR;
459    }
460    lpRecorder->getMarkerPosition(&markerPos);
461    return (jint)markerPos;
462}
463
464
465// ----------------------------------------------------------------------------
466static jint android_media_AudioRecord_set_pos_update_period(JNIEnv *env,  jobject thiz,
467        jint period) {
468
469    sp<AudioRecord> lpRecorder = getAudioRecord(env, thiz);
470
471    if (lpRecorder == NULL) {
472        jniThrowException(env, "java/lang/IllegalStateException",
473            "Unable to retrieve AudioRecord pointer for setPositionUpdatePeriod()");
474        return AUDIORECORD_ERROR;
475    }
476    return android_media_translateRecorderErrorCode( lpRecorder->setPositionUpdatePeriod(period) );
477}
478
479
480// ----------------------------------------------------------------------------
481static jint android_media_AudioRecord_get_pos_update_period(JNIEnv *env,  jobject thiz) {
482
483    sp<AudioRecord> lpRecorder = getAudioRecord(env, thiz);
484    uint32_t period = 0;
485
486    if (lpRecorder == NULL) {
487        jniThrowException(env, "java/lang/IllegalStateException",
488            "Unable to retrieve AudioRecord pointer for getPositionUpdatePeriod()");
489        return AUDIORECORD_ERROR;
490    }
491    lpRecorder->getPositionUpdatePeriod(&period);
492    return (jint)period;
493}
494
495
496// ----------------------------------------------------------------------------
497// returns the minimum required size for the successful creation of an AudioRecord instance.
498// returns 0 if the parameter combination is not supported.
499// return -1 if there was an error querying the buffer size.
500static jint android_media_AudioRecord_get_min_buff_size(JNIEnv *env,  jobject thiz,
501    jint sampleRateInHertz, jint nbChannels, jint audioFormat) {
502
503    ALOGV(">> android_media_AudioRecord_get_min_buff_size(%d, %d, %d)",
504          sampleRateInHertz, nbChannels, audioFormat);
505
506    size_t frameCount = 0;
507    status_t result = AudioRecord::getMinFrameCount(&frameCount,
508            sampleRateInHertz,
509            (audioFormat == ENCODING_PCM_16BIT ?
510                AUDIO_FORMAT_PCM_16_BIT : AUDIO_FORMAT_PCM_8_BIT),
511            audio_channel_in_mask_from_count(nbChannels));
512
513    if (result == BAD_VALUE) {
514        return 0;
515    }
516    if (result != NO_ERROR) {
517        return -1;
518    }
519    return frameCount * nbChannels * (audioFormat == ENCODING_PCM_16BIT ? 2 : 1);
520}
521
522
523// ----------------------------------------------------------------------------
524// ----------------------------------------------------------------------------
525static JNINativeMethod gMethods[] = {
526    // name,               signature,  funcPtr
527    {"native_start",         "(II)I",    (void *)android_media_AudioRecord_start},
528    {"native_stop",          "()V",    (void *)android_media_AudioRecord_stop},
529    {"native_setup",         "(Ljava/lang/Object;IIIII[I)I",
530                                       (void *)android_media_AudioRecord_setup},
531    {"native_finalize",      "()V",    (void *)android_media_AudioRecord_finalize},
532    {"native_release",       "()V",    (void *)android_media_AudioRecord_release},
533    {"native_read_in_byte_array",
534                             "([BII)I", (void *)android_media_AudioRecord_readInByteArray},
535    {"native_read_in_short_array",
536                             "([SII)I", (void *)android_media_AudioRecord_readInShortArray},
537    {"native_read_in_direct_buffer","(Ljava/lang/Object;I)I",
538                                       (void *)android_media_AudioRecord_readInDirectBuffer},
539    {"native_set_marker_pos","(I)I",   (void *)android_media_AudioRecord_set_marker_pos},
540    {"native_get_marker_pos","()I",    (void *)android_media_AudioRecord_get_marker_pos},
541    {"native_set_pos_update_period",
542                             "(I)I",   (void *)android_media_AudioRecord_set_pos_update_period},
543    {"native_get_pos_update_period",
544                             "()I",    (void *)android_media_AudioRecord_get_pos_update_period},
545    {"native_get_min_buff_size",
546                             "(III)I",   (void *)android_media_AudioRecord_get_min_buff_size},
547};
548
549// field names found in android/media/AudioRecord.java
550#define JAVA_POSTEVENT_CALLBACK_NAME  "postEventFromNative"
551#define JAVA_NATIVERECORDERINJAVAOBJ_FIELD_NAME  "mNativeRecorderInJavaObj"
552#define JAVA_NATIVECALLBACKINFO_FIELD_NAME       "mNativeCallbackCookie"
553
554// ----------------------------------------------------------------------------
555int register_android_media_AudioRecord(JNIEnv *env)
556{
557    javaAudioRecordFields.postNativeEventInJava = NULL;
558    javaAudioRecordFields.nativeRecorderInJavaObj = NULL;
559    javaAudioRecordFields.nativeCallbackCookie = NULL;
560
561
562    // Get the AudioRecord class
563    jclass audioRecordClass = env->FindClass(kClassPathName);
564    if (audioRecordClass == NULL) {
565        ALOGE("Can't find %s", kClassPathName);
566        return -1;
567    }
568    // Get the postEvent method
569    javaAudioRecordFields.postNativeEventInJava = env->GetStaticMethodID(
570            audioRecordClass,
571            JAVA_POSTEVENT_CALLBACK_NAME, "(Ljava/lang/Object;IIILjava/lang/Object;)V");
572    if (javaAudioRecordFields.postNativeEventInJava == NULL) {
573        ALOGE("Can't find AudioRecord.%s", JAVA_POSTEVENT_CALLBACK_NAME);
574        return -1;
575    }
576
577    // Get the variables
578    //    mNativeRecorderInJavaObj
579    javaAudioRecordFields.nativeRecorderInJavaObj =
580        env->GetFieldID(audioRecordClass,
581                        JAVA_NATIVERECORDERINJAVAOBJ_FIELD_NAME, "I");
582    if (javaAudioRecordFields.nativeRecorderInJavaObj == NULL) {
583        ALOGE("Can't find AudioRecord.%s", JAVA_NATIVERECORDERINJAVAOBJ_FIELD_NAME);
584        return -1;
585    }
586    //     mNativeCallbackCookie
587    javaAudioRecordFields.nativeCallbackCookie = env->GetFieldID(
588            audioRecordClass,
589            JAVA_NATIVECALLBACKINFO_FIELD_NAME, "I");
590    if (javaAudioRecordFields.nativeCallbackCookie == NULL) {
591        ALOGE("Can't find AudioRecord.%s", JAVA_NATIVECALLBACKINFO_FIELD_NAME);
592        return -1;
593    }
594
595    return AndroidRuntime::registerNativeMethods(env,
596            kClassPathName, gMethods, NELEM(gMethods));
597}
598
599// ----------------------------------------------------------------------------
600