android_media_MediaRecorder.cpp revision 6215d3ff4b5dfa52a5d8b9a42e343051f31066a5 
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#define LOG_TAG "MediaRecorderJNI"
19#include <utils/Log.h>
20
21#include <surfaceflinger/SurfaceComposerClient.h>
22#include <camera/ICameraService.h>
23#include <camera/Camera.h>
24#include <media/mediarecorder.h>
25#include <stdio.h>
26#include <assert.h>
27#include <limits.h>
28#include <unistd.h>
29#include <fcntl.h>
30#include <utils/threads.h>
31
32#include "jni.h"
33#include "JNIHelp.h"
34#include "android_runtime/AndroidRuntime.h"
35
36#include <system/audio.h>
37
38// ----------------------------------------------------------------------------
39
40using namespace android;
41
42// ----------------------------------------------------------------------------
43
44// helper function to extract a native Camera object from a Camera Java object
45extern sp<Camera> get_native_camera(JNIEnv *env, jobject thiz, struct JNICameraContext** context);
46
47struct fields_t {
48    jfieldID    context;
49    jfieldID    surface;
50    /* actually in android.view.Surface XXX */
51    jfieldID    surface_native;
52
53    jmethodID   post_event;
54};
55static fields_t fields;
56
57static Mutex sLock;
58
59// ----------------------------------------------------------------------------
60// ref-counted object for callbacks
61class JNIMediaRecorderListener: public MediaRecorderListener
62{
63public:
64    JNIMediaRecorderListener(JNIEnv* env, jobject thiz, jobject weak_thiz);
65    ~JNIMediaRecorderListener();
66    void notify(int msg, int ext1, int ext2);
67private:
68    JNIMediaRecorderListener();
69    jclass      mClass;     // Reference to MediaRecorder class
70    jobject     mObject;    // Weak ref to MediaRecorder Java object to call on
71};
72
73JNIMediaRecorderListener::JNIMediaRecorderListener(JNIEnv* env, jobject thiz, jobject weak_thiz)
74{
75
76    // Hold onto the MediaRecorder class for use in calling the static method
77    // that posts events to the application thread.
78    jclass clazz = env->GetObjectClass(thiz);
79    if (clazz == NULL) {
80        LOGE("Can't find android/media/MediaRecorder");
81        jniThrowException(env, "java/lang/Exception", NULL);
82        return;
83    }
84    mClass = (jclass)env->NewGlobalRef(clazz);
85
86    // We use a weak reference so the MediaRecorder object can be garbage collected.
87    // The reference is only used as a proxy for callbacks.
88    mObject  = env->NewGlobalRef(weak_thiz);
89}
90
91JNIMediaRecorderListener::~JNIMediaRecorderListener()
92{
93    // remove global references
94    JNIEnv *env = AndroidRuntime::getJNIEnv();
95    env->DeleteGlobalRef(mObject);
96    env->DeleteGlobalRef(mClass);
97}
98
99void JNIMediaRecorderListener::notify(int msg, int ext1, int ext2)
100{
101    ALOGV("JNIMediaRecorderListener::notify");
102
103    JNIEnv *env = AndroidRuntime::getJNIEnv();
104    env->CallStaticVoidMethod(mClass, fields.post_event, mObject, msg, ext1, ext2, 0);
105}
106
107// ----------------------------------------------------------------------------
108
109static sp<Surface> get_surface(JNIEnv* env, jobject clazz)
110{
111    ALOGV("get_surface");
112    Surface* const p = (Surface*)env->GetIntField(clazz, fields.surface_native);
113    return sp<Surface>(p);
114}
115
116// Returns true if it throws an exception.
117static bool process_media_recorder_call(JNIEnv *env, status_t opStatus, const char* exception, const char* message)
118{
119    ALOGV("process_media_recorder_call");
120    if (opStatus == (status_t)INVALID_OPERATION) {
121        jniThrowException(env, "java/lang/IllegalStateException", NULL);
122        return true;
123    } else if (opStatus != (status_t)OK) {
124        jniThrowException(env, exception, message);
125        return true;
126    }
127    return false;
128}
129
130static sp<MediaRecorder> getMediaRecorder(JNIEnv* env, jobject thiz)
131{
132    Mutex::Autolock l(sLock);
133    MediaRecorder* const p = (MediaRecorder*)env->GetIntField(thiz, fields.context);
134    return sp<MediaRecorder>(p);
135}
136
137static sp<MediaRecorder> setMediaRecorder(JNIEnv* env, jobject thiz, const sp<MediaRecorder>& recorder)
138{
139    Mutex::Autolock l(sLock);
140    sp<MediaRecorder> old = (MediaRecorder*)env->GetIntField(thiz, fields.context);
141    if (recorder.get()) {
142        recorder->incStrong(thiz);
143    }
144    if (old != 0) {
145        old->decStrong(thiz);
146    }
147    env->SetIntField(thiz, fields.context, (int)recorder.get());
148    return old;
149}
150
151
152static void android_media_MediaRecorder_setCamera(JNIEnv* env, jobject thiz, jobject camera)
153{
154    // we should not pass a null camera to get_native_camera() call.
155    if (camera == NULL) {
156        jniThrowNullPointerException(env, "camera object is a NULL pointer");
157        return;
158    }
159    sp<Camera> c = get_native_camera(env, camera, NULL);
160    sp<MediaRecorder> mr = getMediaRecorder(env, thiz);
161    process_media_recorder_call(env, mr->setCamera(c->remote(), c->getRecordingProxy()),
162            "java/lang/RuntimeException", "setCamera failed.");
163}
164
165static void
166android_media_MediaRecorder_setVideoSource(JNIEnv *env, jobject thiz, jint vs)
167{
168    ALOGV("setVideoSource(%d)", vs);
169    if (vs < VIDEO_SOURCE_DEFAULT || vs >= VIDEO_SOURCE_LIST_END) {
170        jniThrowException(env, "java/lang/IllegalArgumentException", "Invalid video source");
171        return;
172    }
173    sp<MediaRecorder> mr = getMediaRecorder(env, thiz);
174    process_media_recorder_call(env, mr->setVideoSource(vs), "java/lang/RuntimeException", "setVideoSource failed.");
175}
176
177static void
178android_media_MediaRecorder_setAudioSource(JNIEnv *env, jobject thiz, jint as)
179{
180    ALOGV("setAudioSource(%d)", as);
181    if (as < AUDIO_SOURCE_DEFAULT || as >= AUDIO_SOURCE_CNT) {
182        jniThrowException(env, "java/lang/IllegalArgumentException", "Invalid audio source");
183        return;
184    }
185
186    sp<MediaRecorder> mr = getMediaRecorder(env, thiz);
187    process_media_recorder_call(env, mr->setAudioSource(as), "java/lang/RuntimeException", "setAudioSource failed.");
188}
189
190static void
191android_media_MediaRecorder_setOutputFormat(JNIEnv *env, jobject thiz, jint of)
192{
193    ALOGV("setOutputFormat(%d)", of);
194    if (of < OUTPUT_FORMAT_DEFAULT || of >= OUTPUT_FORMAT_LIST_END) {
195        jniThrowException(env, "java/lang/IllegalArgumentException", "Invalid output format");
196        return;
197    }
198    sp<MediaRecorder> mr = getMediaRecorder(env, thiz);
199    process_media_recorder_call(env, mr->setOutputFormat(of), "java/lang/RuntimeException", "setOutputFormat failed.");
200}
201
202static void
203android_media_MediaRecorder_setVideoEncoder(JNIEnv *env, jobject thiz, jint ve)
204{
205    ALOGV("setVideoEncoder(%d)", ve);
206    if (ve < VIDEO_ENCODER_DEFAULT || ve >= VIDEO_ENCODER_LIST_END) {
207        jniThrowException(env, "java/lang/IllegalArgumentException", "Invalid video encoder");
208        return;
209    }
210    sp<MediaRecorder> mr = getMediaRecorder(env, thiz);
211    process_media_recorder_call(env, mr->setVideoEncoder(ve), "java/lang/RuntimeException", "setVideoEncoder failed.");
212}
213
214static void
215android_media_MediaRecorder_setAudioEncoder(JNIEnv *env, jobject thiz, jint ae)
216{
217    ALOGV("setAudioEncoder(%d)", ae);
218    if (ae < AUDIO_ENCODER_DEFAULT || ae >= AUDIO_ENCODER_LIST_END) {
219        jniThrowException(env, "java/lang/IllegalArgumentException", "Invalid audio encoder");
220        return;
221    }
222    sp<MediaRecorder> mr = getMediaRecorder(env, thiz);
223    process_media_recorder_call(env, mr->setAudioEncoder(ae), "java/lang/RuntimeException", "setAudioEncoder failed.");
224}
225
226static void
227android_media_MediaRecorder_setParameter(JNIEnv *env, jobject thiz, jstring params)
228{
229    ALOGV("setParameter()");
230    if (params == NULL)
231    {
232        LOGE("Invalid or empty params string.  This parameter will be ignored.");
233        return;
234    }
235
236    sp<MediaRecorder> mr = getMediaRecorder(env, thiz);
237
238    const char* params8 = env->GetStringUTFChars(params, NULL);
239    if (params8 == NULL)
240    {
241        LOGE("Failed to covert jstring to String8.  This parameter will be ignored.");
242        return;
243    }
244
245    process_media_recorder_call(env, mr->setParameters(String8(params8)), "java/lang/RuntimeException", "setParameter failed.");
246    env->ReleaseStringUTFChars(params,params8);
247}
248
249static void
250android_media_MediaRecorder_setOutputFileFD(JNIEnv *env, jobject thiz, jobject fileDescriptor, jlong offset, jlong length)
251{
252    ALOGV("setOutputFile");
253    if (fileDescriptor == NULL) {
254        jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
255        return;
256    }
257    int fd = jniGetFDFromFileDescriptor(env, fileDescriptor);
258    sp<MediaRecorder> mr = getMediaRecorder(env, thiz);
259    status_t opStatus = mr->setOutputFile(fd, offset, length);
260    process_media_recorder_call(env, opStatus, "java/io/IOException", "setOutputFile failed.");
261}
262
263static void
264android_media_MediaRecorder_setVideoSize(JNIEnv *env, jobject thiz, jint width, jint height)
265{
266    ALOGV("setVideoSize(%d, %d)", width, height);
267    sp<MediaRecorder> mr = getMediaRecorder(env, thiz);
268
269    if (width <= 0 || height <= 0) {
270        jniThrowException(env, "java/lang/IllegalArgumentException", "invalid video size");
271        return;
272    }
273    process_media_recorder_call(env, mr->setVideoSize(width, height), "java/lang/RuntimeException", "setVideoSize failed.");
274}
275
276static void
277android_media_MediaRecorder_setVideoFrameRate(JNIEnv *env, jobject thiz, jint rate)
278{
279    ALOGV("setVideoFrameRate(%d)", rate);
280    if (rate <= 0) {
281        jniThrowException(env, "java/lang/IllegalArgumentException", "invalid frame rate");
282        return;
283    }
284    sp<MediaRecorder> mr = getMediaRecorder(env, thiz);
285    process_media_recorder_call(env, mr->setVideoFrameRate(rate), "java/lang/RuntimeException", "setVideoFrameRate failed.");
286}
287
288static void
289android_media_MediaRecorder_setMaxDuration(JNIEnv *env, jobject thiz, jint max_duration_ms)
290{
291    ALOGV("setMaxDuration(%d)", max_duration_ms);
292    sp<MediaRecorder> mr = getMediaRecorder(env, thiz);
293
294    char params[64];
295    sprintf(params, "max-duration=%d", max_duration_ms);
296
297    process_media_recorder_call(env, mr->setParameters(String8(params)), "java/lang/RuntimeException", "setMaxDuration failed.");
298}
299
300static void
301android_media_MediaRecorder_setMaxFileSize(
302        JNIEnv *env, jobject thiz, jlong max_filesize_bytes)
303{
304    ALOGV("setMaxFileSize(%lld)", max_filesize_bytes);
305    sp<MediaRecorder> mr = getMediaRecorder(env, thiz);
306
307    char params[64];
308    sprintf(params, "max-filesize=%lld", max_filesize_bytes);
309
310    process_media_recorder_call(env, mr->setParameters(String8(params)), "java/lang/RuntimeException", "setMaxFileSize failed.");
311}
312
313static void
314android_media_MediaRecorder_prepare(JNIEnv *env, jobject thiz)
315{
316    ALOGV("prepare");
317    sp<MediaRecorder> mr = getMediaRecorder(env, thiz);
318
319    jobject surface = env->GetObjectField(thiz, fields.surface);
320    if (surface != NULL) {
321        const sp<Surface> native_surface = get_surface(env, surface);
322
323        // The application may misbehave and
324        // the preview surface becomes unavailable
325        if (native_surface.get() == 0) {
326            LOGE("Application lost the surface");
327            jniThrowException(env, "java/io/IOException", "invalid preview surface");
328            return;
329        }
330
331        ALOGI("prepare: surface=%p (identity=%d)", native_surface.get(), native_surface->getIdentity());
332        if (process_media_recorder_call(env, mr->setPreviewSurface(native_surface), "java/lang/RuntimeException", "setPreviewSurface failed.")) {
333            return;
334        }
335    }
336    process_media_recorder_call(env, mr->prepare(), "java/io/IOException", "prepare failed.");
337}
338
339static int
340android_media_MediaRecorder_native_getMaxAmplitude(JNIEnv *env, jobject thiz)
341{
342    ALOGV("getMaxAmplitude");
343    sp<MediaRecorder> mr = getMediaRecorder(env, thiz);
344    int result = 0;
345    process_media_recorder_call(env, mr->getMaxAmplitude(&result), "java/lang/RuntimeException", "getMaxAmplitude failed.");
346    return result;
347}
348
349static void
350android_media_MediaRecorder_start(JNIEnv *env, jobject thiz)
351{
352    ALOGV("start");
353    sp<MediaRecorder> mr = getMediaRecorder(env, thiz);
354    process_media_recorder_call(env, mr->start(), "java/lang/RuntimeException", "start failed.");
355}
356
357static void
358android_media_MediaRecorder_stop(JNIEnv *env, jobject thiz)
359{
360    ALOGV("stop");
361    sp<MediaRecorder> mr = getMediaRecorder(env, thiz);
362    process_media_recorder_call(env, mr->stop(), "java/lang/RuntimeException", "stop failed.");
363}
364
365static void
366android_media_MediaRecorder_native_reset(JNIEnv *env, jobject thiz)
367{
368    ALOGV("native_reset");
369    sp<MediaRecorder> mr = getMediaRecorder(env, thiz);
370    process_media_recorder_call(env, mr->reset(), "java/lang/RuntimeException", "native_reset failed.");
371}
372
373static void
374android_media_MediaRecorder_release(JNIEnv *env, jobject thiz)
375{
376    ALOGV("release");
377    sp<MediaRecorder> mr = setMediaRecorder(env, thiz, 0);
378    if (mr != NULL) {
379        mr->setListener(NULL);
380        mr->release();
381    }
382}
383
384// This function gets some field IDs, which in turn causes class initialization.
385// It is called from a static block in MediaRecorder, which won't run until the
386// first time an instance of this class is used.
387static void
388android_media_MediaRecorder_native_init(JNIEnv *env)
389{
390    jclass clazz;
391
392    clazz = env->FindClass("android/media/MediaRecorder");
393    if (clazz == NULL) {
394        return;
395    }
396
397    fields.context = env->GetFieldID(clazz, "mNativeContext", "I");
398    if (fields.context == NULL) {
399        return;
400    }
401
402    fields.surface = env->GetFieldID(clazz, "mSurface", "Landroid/view/Surface;");
403    if (fields.surface == NULL) {
404        return;
405    }
406
407    jclass surface = env->FindClass("android/view/Surface");
408    if (surface == NULL) {
409        return;
410    }
411
412    fields.surface_native = env->GetFieldID(surface, ANDROID_VIEW_SURFACE_JNI_ID, "I");
413    if (fields.surface_native == NULL) {
414        return;
415    }
416
417    fields.post_event = env->GetStaticMethodID(clazz, "postEventFromNative",
418                                               "(Ljava/lang/Object;IIILjava/lang/Object;)V");
419    if (fields.post_event == NULL) {
420        return;
421    }
422}
423
424
425static void
426android_media_MediaRecorder_native_setup(JNIEnv *env, jobject thiz, jobject weak_this)
427{
428    ALOGV("setup");
429    sp<MediaRecorder> mr = new MediaRecorder();
430    if (mr == NULL) {
431        jniThrowException(env, "java/lang/RuntimeException", "Out of memory");
432        return;
433    }
434    if (mr->initCheck() != NO_ERROR) {
435        jniThrowException(env, "java/lang/RuntimeException", "Unable to initialize media recorder");
436        return;
437    }
438
439    // create new listener and give it to MediaRecorder
440    sp<JNIMediaRecorderListener> listener = new JNIMediaRecorderListener(env, thiz, weak_this);
441    mr->setListener(listener);
442
443    setMediaRecorder(env, thiz, mr);
444}
445
446static void
447android_media_MediaRecorder_native_finalize(JNIEnv *env, jobject thiz)
448{
449    ALOGV("finalize");
450    android_media_MediaRecorder_release(env, thiz);
451}
452
453// ----------------------------------------------------------------------------
454
455static JNINativeMethod gMethods[] = {
456    {"setCamera",            "(Landroid/hardware/Camera;)V",    (void *)android_media_MediaRecorder_setCamera},
457    {"setVideoSource",       "(I)V",                            (void *)android_media_MediaRecorder_setVideoSource},
458    {"setAudioSource",       "(I)V",                            (void *)android_media_MediaRecorder_setAudioSource},
459    {"setOutputFormat",      "(I)V",                            (void *)android_media_MediaRecorder_setOutputFormat},
460    {"setVideoEncoder",      "(I)V",                            (void *)android_media_MediaRecorder_setVideoEncoder},
461    {"setAudioEncoder",      "(I)V",                            (void *)android_media_MediaRecorder_setAudioEncoder},
462    {"setParameter",         "(Ljava/lang/String;)V",           (void *)android_media_MediaRecorder_setParameter},
463    {"_setOutputFile",       "(Ljava/io/FileDescriptor;JJ)V",   (void *)android_media_MediaRecorder_setOutputFileFD},
464    {"setVideoSize",         "(II)V",                           (void *)android_media_MediaRecorder_setVideoSize},
465    {"setVideoFrameRate",    "(I)V",                            (void *)android_media_MediaRecorder_setVideoFrameRate},
466    {"setMaxDuration",       "(I)V",                            (void *)android_media_MediaRecorder_setMaxDuration},
467    {"setMaxFileSize",       "(J)V",                            (void *)android_media_MediaRecorder_setMaxFileSize},
468    {"_prepare",             "()V",                             (void *)android_media_MediaRecorder_prepare},
469    {"getMaxAmplitude",      "()I",                             (void *)android_media_MediaRecorder_native_getMaxAmplitude},
470    {"start",                "()V",                             (void *)android_media_MediaRecorder_start},
471    {"stop",                 "()V",                             (void *)android_media_MediaRecorder_stop},
472    {"native_reset",         "()V",                             (void *)android_media_MediaRecorder_native_reset},
473    {"release",              "()V",                             (void *)android_media_MediaRecorder_release},
474    {"native_init",          "()V",                             (void *)android_media_MediaRecorder_native_init},
475    {"native_setup",         "(Ljava/lang/Object;)V",           (void *)android_media_MediaRecorder_native_setup},
476    {"native_finalize",      "()V",                             (void *)android_media_MediaRecorder_native_finalize},
477};
478
479static const char* const kClassPathName = "android/media/MediaRecorder";
480
481// This function only registers the native methods, and is called from
482// JNI_OnLoad in android_media_MediaPlayer.cpp
483int register_android_media_MediaRecorder(JNIEnv *env)
484{
485    return AndroidRuntime::registerNativeMethods(env,
486                "android/media/MediaRecorder", gMethods, NELEM(gMethods));
487}
488