media/jni/android_media_MediaPlayer.cpp

/*
**
** Copyright 2007, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
**     http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/

//#define LOG_NDEBUG 0
#define LOG_TAG "MediaPlayer-JNI"
#include "utils/Log.h"

#include <media/mediaplayer.h>
#include <media/MediaPlayerInterface.h>
#include <stdio.h>
#include <assert.h>
#include <limits.h>
#include <unistd.h>
#include <fcntl.h>
#include <utils/threads.h>
#include "jni.h"
#include "JNIHelp.h"
#include "android_runtime/AndroidRuntime.h"
#include "utils/Errors.h"  // for status_t
#include "utils/KeyedVector.h"
#include "utils/String8.h"
#include "android_util_Binder.h"
#include <binder/Parcel.h>
#include <gui/SurfaceTexture.h>
#include <gui/ISurfaceTexture.h>
#include <surfaceflinger/Surface.h>
#include <binder/IPCThreadState.h>
#include <binder/IServiceManager.h>

// ----------------------------------------------------------------------------

using namespace android;

// ----------------------------------------------------------------------------

struct fields_t {
    jfieldID    context;
    jfieldID    surface;
    jfieldID    surfaceTexture;
    /* actually in android.view.Surface XXX */
    jfieldID    surface_native;
    // actually in android.graphics.SurfaceTexture
    jfieldID    surfaceTexture_native;

    jmethodID   post_event;
};
static fields_t fields;

static Mutex sLock;

// ----------------------------------------------------------------------------
// ref-counted object for callbacks
class JNIMediaPlayerListener: public MediaPlayerListener
{
public:
    JNIMediaPlayerListener(JNIEnv* env, jobject thiz, jobject weak_thiz);
    ~JNIMediaPlayerListener();
    virtual void notify(int msg, int ext1, int ext2, const Parcel *obj = NULL);
private:
    JNIMediaPlayerListener();
    jclass      mClass;     // Reference to MediaPlayer class
    jobject     mObject;    // Weak ref to MediaPlayer Java object to call on
};

JNIMediaPlayerListener::JNIMediaPlayerListener(JNIEnv* env, jobject thiz, jobject weak_thiz)
{

    // Hold onto the MediaPlayer class for use in calling the static method
    // that posts events to the application thread.
    jclass clazz = env->GetObjectClass(thiz);
    if (clazz == NULL) {
        LOGE("Can't find android/media/MediaPlayer");
        jniThrowException(env, "java/lang/Exception", NULL);
        return;
    }
    mClass = (jclass)env->NewGlobalRef(clazz);

    // We use a weak reference so the MediaPlayer object can be garbage collected.
    // The reference is only used as a proxy for callbacks.
    mObject  = env->NewGlobalRef(weak_thiz);
}

JNIMediaPlayerListener::~JNIMediaPlayerListener()
{
    // remove global references
    JNIEnv *env = AndroidRuntime::getJNIEnv();
    env->DeleteGlobalRef(mObject);
    env->DeleteGlobalRef(mClass);
}

void JNIMediaPlayerListener::notify(int msg, int ext1, int ext2, const Parcel *obj)
{
    JNIEnv *env = AndroidRuntime::getJNIEnv();
    if (obj && obj->dataSize() > 0) {
        jbyteArray jArray = env->NewByteArray(obj->dataSize());
        if (jArray != NULL) {
            jbyte *nArray = env->GetByteArrayElements(jArray, NULL);
            memcpy(nArray, obj->data(), obj->dataSize());
            env->ReleaseByteArrayElements(jArray, nArray, 0);
            env->CallStaticVoidMethod(mClass, fields.post_event, mObject,
                    msg, ext1, ext2, jArray);
            env->DeleteLocalRef(jArray);
        }
    } else {
        env->CallStaticVoidMethod(mClass, fields.post_event, mObject,
                msg, ext1, ext2, NULL);
    }
}

// ----------------------------------------------------------------------------

static Surface* get_surface(JNIEnv* env, jobject clazz)
{
    return (Surface*)env->GetIntField(clazz, fields.surface_native);
}

sp<ISurfaceTexture> getSurfaceTexture(JNIEnv* env, jobject clazz)
{
    sp<ISurfaceTexture> surfaceTexture(
        (ISurfaceTexture*)env->GetIntField(clazz, fields.surfaceTexture_native));
    return surfaceTexture;
}

static sp<MediaPlayer> getMediaPlayer(JNIEnv* env, jobject thiz)
{
    Mutex::Autolock l(sLock);
    MediaPlayer* const p = (MediaPlayer*)env->GetIntField(thiz, fields.context);
    return sp<MediaPlayer>(p);
}

static sp<MediaPlayer> setMediaPlayer(JNIEnv* env, jobject thiz, const sp<MediaPlayer>& player)
{
    Mutex::Autolock l(sLock);
    sp<MediaPlayer> old = (MediaPlayer*)env->GetIntField(thiz, fields.context);
    if (player.get()) {
        player->incStrong(thiz);
    }
    if (old != 0) {
        old->decStrong(thiz);
    }
    env->SetIntField(thiz, fields.context, (int)player.get());
    return old;
}

// If exception is NULL and opStatus is not OK, this method sends an error
// event to the client application; otherwise, if exception is not NULL and
// opStatus is not OK, this method throws the given exception to the client
// application.
static void process_media_player_call(JNIEnv *env, jobject thiz, status_t opStatus, const char* exception, const char *message)
{
    if (exception == NULL) {  // Don't throw exception. Instead, send an event.
        if (opStatus != (status_t) OK) {
            sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
            if (mp != 0) mp->notify(MEDIA_ERROR, opStatus, 0);
        }
    } else {  // Throw exception!
        if ( opStatus == (status_t) INVALID_OPERATION ) {
            jniThrowException(env, "java/lang/IllegalStateException", NULL);
        } else if ( opStatus != (status_t) OK ) {
            if (strlen(message) > 230) {
               // if the message is too long, don't bother displaying the status code
               jniThrowException( env, exception, message);
            } else {
               char msg[256];
                // append the status code to the message
               sprintf(msg, "%s: status=0x%X", message, opStatus);
               jniThrowException( env, exception, msg);
            }
        }
    }
}

static void
android_media_MediaPlayer_setDataSourceAndHeaders(
        JNIEnv *env, jobject thiz, jstring path, jobject headers) {
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return;
    }

    if (path == NULL) {
        jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
        return;
    }

    const char *tmp = env->GetStringUTFChars(path, NULL);
    if (tmp == NULL) {  // Out of memory
        return;
    }

    String8 pathStr(tmp);
    env->ReleaseStringUTFChars(path, tmp);
    tmp = NULL;

    // headers is a Map<String, String>.
    // We build a similar KeyedVector out of it.
    KeyedVector<String8, String8> headersVector;
    if (headers) {
        // Get the Map's entry Set.
        jclass mapClass = env->FindClass("java/util/Map");
        if (mapClass == NULL) {
            return;
        }

        jmethodID entrySet =
            env->GetMethodID(mapClass, "entrySet", "()Ljava/util/Set;");
        if (entrySet == NULL) {
            return;
        }

        jobject set = env->CallObjectMethod(headers, entrySet);
        if (set == NULL) {
            return;
        }

        // Obtain an iterator over the Set
        jclass setClass = env->FindClass("java/util/Set");
        if (setClass == NULL) {
            return;
        }

        jmethodID iterator =
            env->GetMethodID(setClass, "iterator", "()Ljava/util/Iterator;");
        if (iterator == NULL) {
            return;
        }

        jobject iter = env->CallObjectMethod(set, iterator);
        if (iter == NULL) {
            return;
        }

        // Get the Iterator method IDs
        jclass iteratorClass = env->FindClass("java/util/Iterator");
        if (iteratorClass == NULL) {
            return;
        }

        jmethodID hasNext = env->GetMethodID(iteratorClass, "hasNext", "()Z");
        if (hasNext == NULL) {
            return;
        }

        jmethodID next =
            env->GetMethodID(iteratorClass, "next", "()Ljava/lang/Object;");
        if (next == NULL) {
            return;
        }

        // Get the Entry class method IDs
        jclass entryClass = env->FindClass("java/util/Map$Entry");
        if (entryClass == NULL) {
            return;
        }

        jmethodID getKey =
            env->GetMethodID(entryClass, "getKey", "()Ljava/lang/Object;");
        if (getKey == NULL) {
            return;
        }

        jmethodID getValue =
            env->GetMethodID(entryClass, "getValue", "()Ljava/lang/Object;");
        if (getValue == NULL) {
            return;
        }

        // Iterate over the entry Set
        while (env->CallBooleanMethod(iter, hasNext)) {
            jobject entry = env->CallObjectMethod(iter, next);
            jstring key = (jstring) env->CallObjectMethod(entry, getKey);
            jstring value = (jstring) env->CallObjectMethod(entry, getValue);

            const char* keyStr = env->GetStringUTFChars(key, NULL);
            if (!keyStr) {  // Out of memory
                return;
            }

            const char* valueStr = env->GetStringUTFChars(value, NULL);
            if (!valueStr) {  // Out of memory
                env->ReleaseStringUTFChars(key, keyStr);
                return;
            }

            headersVector.add(String8(keyStr), String8(valueStr));

            env->DeleteLocalRef(entry);
            env->ReleaseStringUTFChars(key, keyStr);
            env->DeleteLocalRef(key);
            env->ReleaseStringUTFChars(value, valueStr);
            env->DeleteLocalRef(value);
        }

    }

    LOGV("setDataSource: path %s", pathStr);
    status_t opStatus =
        mp->setDataSource(
                pathStr,
                headers ? &headersVector : NULL);

    process_media_player_call(
            env, thiz, opStatus, "java/io/IOException",
            "setDataSource failed." );
}

static void
android_media_MediaPlayer_setDataSource(JNIEnv *env, jobject thiz, jstring path)
{
    android_media_MediaPlayer_setDataSourceAndHeaders(env, thiz, path, 0);
}

static void
android_media_MediaPlayer_setDataSourceFD(JNIEnv *env, jobject thiz, jobject fileDescriptor, jlong offset, jlong length)
{
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return;
    }

    if (fileDescriptor == NULL) {
        jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
        return;
    }
    int fd = getParcelFileDescriptorFD(env, fileDescriptor);
    LOGV("setDataSourceFD: fd %d", fd);
    process_media_player_call( env, thiz, mp->setDataSource(fd, offset, length), "java/io/IOException", "setDataSourceFD failed." );
}

static void setVideoSurfaceOrSurfaceTexture(
        const sp<MediaPlayer>& mp, JNIEnv *env, jobject thiz, const char *prefix)
{
    // The Java MediaPlayer class makes sure that at most one of mSurface and
    // mSurfaceTexture is non-null.  But just in case, we give priority to
    // mSurface over mSurfaceTexture.
    jobject surface = env->GetObjectField(thiz, fields.surface);
    if (surface != NULL) {
        sp<Surface> native_surface(get_surface(env, surface));
        LOGV("%s: surface=%p (id=%d)", prefix,
             native_surface.get(), native_surface->getIdentity());
        mp->setVideoSurface(native_surface);
    } else {
        jobject surfaceTexture = env->GetObjectField(thiz, fields.surfaceTexture);
        if (surfaceTexture != NULL) {
            sp<ISurfaceTexture> native_surfaceTexture(
                    getSurfaceTexture(env, surfaceTexture));
            LOGV("%s: texture=%p", prefix, native_surfaceTexture.get());
            mp->setVideoSurfaceTexture(native_surfaceTexture);
        }
    }
}

static void
android_media_MediaPlayer_setVideoSurfaceOrSurfaceTexture(JNIEnv *env, jobject thiz)
{
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return;
    }
    setVideoSurfaceOrSurfaceTexture(mp, env, thiz,
            "_setVideoSurfaceOrSurfaceTexture");
}

static void
android_media_MediaPlayer_prepare(JNIEnv *env, jobject thiz)
{
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return;
    }
    setVideoSurfaceOrSurfaceTexture(mp, env, thiz, "prepare");
    process_media_player_call( env, thiz, mp->prepare(), "java/io/IOException", "Prepare failed." );
}

static void
android_media_MediaPlayer_prepareAsync(JNIEnv *env, jobject thiz)
{
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return;
    }
    setVideoSurfaceOrSurfaceTexture(mp, env, thiz, "prepareAsync");
    process_media_player_call( env, thiz, mp->prepareAsync(), "java/io/IOException", "Prepare Async failed." );
}

static void
android_media_MediaPlayer_start(JNIEnv *env, jobject thiz)
{
    LOGV("start");
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return;
    }
    process_media_player_call( env, thiz, mp->start(), NULL, NULL );
}

static void
android_media_MediaPlayer_stop(JNIEnv *env, jobject thiz)
{
    LOGV("stop");
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return;
    }
    process_media_player_call( env, thiz, mp->stop(), NULL, NULL );
}

static void
android_media_MediaPlayer_pause(JNIEnv *env, jobject thiz)
{
    LOGV("pause");
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return;
    }
    process_media_player_call( env, thiz, mp->pause(), NULL, NULL );
}

static jboolean
android_media_MediaPlayer_isPlaying(JNIEnv *env, jobject thiz)
{
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return false;
    }
    const jboolean is_playing = mp->isPlaying();

    LOGV("isPlaying: %d", is_playing);
    return is_playing;
}

static void
android_media_MediaPlayer_seekTo(JNIEnv *env, jobject thiz, int msec)
{
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return;
    }
    LOGV("seekTo: %d(msec)", msec);
    process_media_player_call( env, thiz, mp->seekTo(msec), NULL, NULL );
}

static int
android_media_MediaPlayer_getVideoWidth(JNIEnv *env, jobject thiz)
{
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return 0;
    }
    int w;
    if (0 != mp->getVideoWidth(&w)) {
        LOGE("getVideoWidth failed");
        w = 0;
    }
    LOGV("getVideoWidth: %d", w);
    return w;
}

static int
android_media_MediaPlayer_getVideoHeight(JNIEnv *env, jobject thiz)
{
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return 0;
    }
    int h;
    if (0 != mp->getVideoHeight(&h)) {
        LOGE("getVideoHeight failed");
        h = 0;
    }
    LOGV("getVideoHeight: %d", h);
    return h;
}


static int
android_media_MediaPlayer_getCurrentPosition(JNIEnv *env, jobject thiz)
{
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return 0;
    }
    int msec;
    process_media_player_call( env, thiz, mp->getCurrentPosition(&msec), NULL, NULL );
    LOGV("getCurrentPosition: %d (msec)", msec);
    return msec;
}

static int
android_media_MediaPlayer_getDuration(JNIEnv *env, jobject thiz)
{
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return 0;
    }
    int msec;
    process_media_player_call( env, thiz, mp->getDuration(&msec), NULL, NULL );
    LOGV("getDuration: %d (msec)", msec);
    return msec;
}

static void
android_media_MediaPlayer_reset(JNIEnv *env, jobject thiz)
{
    LOGV("reset");
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return;
    }
    process_media_player_call( env, thiz, mp->reset(), NULL, NULL );
}

static void
android_media_MediaPlayer_setAudioStreamType(JNIEnv *env, jobject thiz, int streamtype)
{
    LOGV("setAudioStreamType: %d", streamtype);
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return;
    }
    process_media_player_call( env, thiz, mp->setAudioStreamType(streamtype) , NULL, NULL );
}

static void
android_media_MediaPlayer_setLooping(JNIEnv *env, jobject thiz, jboolean looping)
{
    LOGV("setLooping: %d", looping);
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return;
    }
    process_media_player_call( env, thiz, mp->setLooping(looping), NULL, NULL );
}

static jboolean
android_media_MediaPlayer_isLooping(JNIEnv *env, jobject thiz)
{
    LOGV("isLooping");
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return false;
    }
    return mp->isLooping();
}

static void
android_media_MediaPlayer_setVolume(JNIEnv *env, jobject thiz, float leftVolume, float rightVolume)
{
    LOGV("setVolume: left %f  right %f", leftVolume, rightVolume);
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return;
    }
    process_media_player_call( env, thiz, mp->setVolume(leftVolume, rightVolume), NULL, NULL );
}

// FIXME: deprecated
static jobject
android_media_MediaPlayer_getFrameAt(JNIEnv *env, jobject thiz, jint msec)
{
    return NULL;
}


// Sends the request and reply parcels to the media player via the
// binder interface.
static jint
android_media_MediaPlayer_invoke(JNIEnv *env, jobject thiz,
                                 jobject java_request, jobject java_reply)
{
    sp<MediaPlayer> media_player = getMediaPlayer(env, thiz);
    if (media_player == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return UNKNOWN_ERROR;
    }


    Parcel *request = parcelForJavaObject(env, java_request);
    Parcel *reply = parcelForJavaObject(env, java_reply);

    // Don't use process_media_player_call which use the async loop to
    // report errors, instead returns the status.
    return media_player->invoke(*request, reply);
}

// Sends the new filter to the client.
static jint
android_media_MediaPlayer_setMetadataFilter(JNIEnv *env, jobject thiz, jobject request)
{
    sp<MediaPlayer> media_player = getMediaPlayer(env, thiz);
    if (media_player == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return UNKNOWN_ERROR;
    }

    Parcel *filter = parcelForJavaObject(env, request);

    if (filter == NULL ) {
        jniThrowException(env, "java/lang/RuntimeException", "Filter is null");
        return UNKNOWN_ERROR;
    }

    return media_player->setMetadataFilter(*filter);
}

static jboolean
android_media_MediaPlayer_getMetadata(JNIEnv *env, jobject thiz, jboolean update_only,
                                      jboolean apply_filter, jobject reply)
{
    sp<MediaPlayer> media_player = getMediaPlayer(env, thiz);
    if (media_player == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return false;
    }

    Parcel *metadata = parcelForJavaObject(env, reply);

    if (metadata == NULL ) {
        jniThrowException(env, "java/lang/RuntimeException", "Reply parcel is null");
        return false;
    }

    metadata->freeData();
    // On return metadata is positioned at the beginning of the
    // metadata. Note however that the parcel actually starts with the
    // return code so you should not rewind the parcel using
    // setDataPosition(0).
    return media_player->getMetadata(update_only, apply_filter, metadata) == OK;
}

// This function gets some field IDs, which in turn causes class initialization.
// It is called from a static block in MediaPlayer, which won't run until the
// first time an instance of this class is used.
static void
android_media_MediaPlayer_native_init(JNIEnv *env)
{
    jclass clazz;

    clazz = env->FindClass("android/media/MediaPlayer");
    if (clazz == NULL) {
        return;
    }

    fields.context = env->GetFieldID(clazz, "mNativeContext", "I");
    if (fields.context == NULL) {
        return;
    }

    fields.post_event = env->GetStaticMethodID(clazz, "postEventFromNative",
                                               "(Ljava/lang/Object;IIILjava/lang/Object;)V");
    if (fields.post_event == NULL) {
        return;
    }

    fields.surface = env->GetFieldID(clazz, "mSurface", "Landroid/view/Surface;");
    if (fields.surface == NULL) {
        return;
    }

    jclass surface = env->FindClass("android/view/Surface");
    if (surface == NULL) {
        return;
    }

    fields.surface_native = env->GetFieldID(surface, ANDROID_VIEW_SURFACE_JNI_ID, "I");
    if (fields.surface_native == NULL) {
        return;
    }

    fields.surfaceTexture = env->GetFieldID(clazz, "mSurfaceTexture",
            "Landroid/graphics/SurfaceTexture;");
    if (fields.surfaceTexture == NULL) {
        return;
    }

    jclass surfaceTexture = env->FindClass("android/graphics/SurfaceTexture");
    if (surfaceTexture == NULL) {
        return;
    }

    fields.surfaceTexture_native = env->GetFieldID(surfaceTexture,
            ANDROID_GRAPHICS_SURFACETEXTURE_JNI_ID, "I");
    if (fields.surfaceTexture_native == NULL) {
        return;
    }

}

static void
android_media_MediaPlayer_native_setup(JNIEnv *env, jobject thiz, jobject weak_this)
{
    LOGV("native_setup");
    sp<MediaPlayer> mp = new MediaPlayer();
    if (mp == NULL) {
        jniThrowException(env, "java/lang/RuntimeException", "Out of memory");
        return;
    }

    // create new listener and give it to MediaPlayer
    sp<JNIMediaPlayerListener> listener = new JNIMediaPlayerListener(env, thiz, weak_this);
    mp->setListener(listener);

    // Stow our new C++ MediaPlayer in an opaque field in the Java object.
    setMediaPlayer(env, thiz, mp);
}

static void
android_media_MediaPlayer_release(JNIEnv *env, jobject thiz)
{
    LOGV("release");
    sp<MediaPlayer> mp = setMediaPlayer(env, thiz, 0);
    if (mp != NULL) {
        // this prevents native callbacks after the object is released
        mp->setListener(0);
        mp->disconnect();
    }
}

static void
android_media_MediaPlayer_native_finalize(JNIEnv *env, jobject thiz)
{
    LOGV("native_finalize");
    android_media_MediaPlayer_release(env, thiz);
}

static void android_media_MediaPlayer_set_audio_session_id(JNIEnv *env,  jobject thiz, jint sessionId) {
    LOGV("set_session_id(): %d", sessionId);
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return;
    }
    process_media_player_call( env, thiz, mp->setAudioSessionId(sessionId), NULL, NULL );
}

static jint android_media_MediaPlayer_get_audio_session_id(JNIEnv *env,  jobject thiz) {
    LOGV("get_session_id()");
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return 0;
    }

    return mp->getAudioSessionId();
}

static void
android_media_MediaPlayer_setAuxEffectSendLevel(JNIEnv *env, jobject thiz, jfloat level)
{
    LOGV("setAuxEffectSendLevel: level %f", level);
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return;
    }
    process_media_player_call( env, thiz, mp->setAuxEffectSendLevel(level), NULL, NULL );
}

static void android_media_MediaPlayer_attachAuxEffect(JNIEnv *env,  jobject thiz, jint effectId) {
    LOGV("attachAuxEffect(): %d", effectId);
    sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
    if (mp == NULL ) {
        jniThrowException(env, "java/lang/IllegalStateException", NULL);
        return;
    }
    process_media_player_call( env, thiz, mp->attachAuxEffect(effectId), NULL, NULL );
}

static jint
android_media_MediaPlayer_pullBatteryData(JNIEnv *env, jobject thiz, jobject java_reply)
{
    sp<IBinder> binder = defaultServiceManager()->getService(String16("media.player"));
    sp<IMediaPlayerService> service = interface_cast<IMediaPlayerService>(binder);
    if (service.get() == NULL) {
        jniThrowException(env, "java/lang/RuntimeException", "cannot get MediaPlayerService");
        return UNKNOWN_ERROR;
    }

    Parcel *reply = parcelForJavaObject(env, java_reply);

    return service->pullBatteryData(reply);
}

// ----------------------------------------------------------------------------

static JNINativeMethod gMethods[] = {
    {"setDataSource",       "(Ljava/lang/String;)V",            (void *)android_media_MediaPlayer_setDataSource},
    {"setDataSource",       "(Ljava/lang/String;Ljava/util/Map;)V",(void *)android_media_MediaPlayer_setDataSourceAndHeaders},
    {"setDataSource",       "(Ljava/io/FileDescriptor;JJ)V",    (void *)android_media_MediaPlayer_setDataSourceFD},
    {"_setVideoSurfaceOrSurfaceTexture", "()V",                 (void *)android_media_MediaPlayer_setVideoSurfaceOrSurfaceTexture},
    {"prepare",             "()V",                              (void *)android_media_MediaPlayer_prepare},
    {"prepareAsync",        "()V",                              (void *)android_media_MediaPlayer_prepareAsync},
    {"_start",              "()V",                              (void *)android_media_MediaPlayer_start},
    {"_stop",               "()V",                              (void *)android_media_MediaPlayer_stop},
    {"getVideoWidth",       "()I",                              (void *)android_media_MediaPlayer_getVideoWidth},
    {"getVideoHeight",      "()I",                              (void *)android_media_MediaPlayer_getVideoHeight},
    {"seekTo",              "(I)V",                             (void *)android_media_MediaPlayer_seekTo},
    {"_pause",              "()V",                              (void *)android_media_MediaPlayer_pause},
    {"isPlaying",           "()Z",                              (void *)android_media_MediaPlayer_isPlaying},
    {"getCurrentPosition",  "()I",                              (void *)android_media_MediaPlayer_getCurrentPosition},
    {"getDuration",         "()I",                              (void *)android_media_MediaPlayer_getDuration},
    {"_release",            "()V",                              (void *)android_media_MediaPlayer_release},
    {"_reset",              "()V",                              (void *)android_media_MediaPlayer_reset},
    {"setAudioStreamType",  "(I)V",                             (void *)android_media_MediaPlayer_setAudioStreamType},
    {"setLooping",          "(Z)V",                             (void *)android_media_MediaPlayer_setLooping},
    {"isLooping",           "()Z",                              (void *)android_media_MediaPlayer_isLooping},
    {"setVolume",           "(FF)V",                            (void *)android_media_MediaPlayer_setVolume},
    {"getFrameAt",          "(I)Landroid/graphics/Bitmap;",     (void *)android_media_MediaPlayer_getFrameAt},
    {"native_invoke",       "(Landroid/os/Parcel;Landroid/os/Parcel;)I",(void *)android_media_MediaPlayer_invoke},
    {"native_setMetadataFilter", "(Landroid/os/Parcel;)I",      (void *)android_media_MediaPlayer_setMetadataFilter},
    {"native_getMetadata", "(ZZLandroid/os/Parcel;)Z",          (void *)android_media_MediaPlayer_getMetadata},
    {"native_init",         "()V",                              (void *)android_media_MediaPlayer_native_init},
    {"native_setup",        "(Ljava/lang/Object;)V",            (void *)android_media_MediaPlayer_native_setup},
    {"native_finalize",     "()V",                              (void *)android_media_MediaPlayer_native_finalize},
    {"getAudioSessionId",   "()I",                              (void *)android_media_MediaPlayer_get_audio_session_id},
    {"setAudioSessionId",   "(I)V",                             (void *)android_media_MediaPlayer_set_audio_session_id},
    {"setAuxEffectSendLevel", "(F)V",                           (void *)android_media_MediaPlayer_setAuxEffectSendLevel},
    {"attachAuxEffect",     "(I)V",                             (void *)android_media_MediaPlayer_attachAuxEffect},
    {"native_pullBatteryData", "(Landroid/os/Parcel;)I",        (void *)android_media_MediaPlayer_pullBatteryData},
};

static const char* const kClassPathName = "android/media/MediaPlayer";

// This function only registers the native methods
static int register_android_media_MediaPlayer(JNIEnv *env)
{
    return AndroidRuntime::registerNativeMethods(env,
                "android/media/MediaPlayer", gMethods, NELEM(gMethods));
}

extern int register_android_media_MediaMetadataRetriever(JNIEnv *env);
extern int register_android_media_MediaRecorder(JNIEnv *env);
extern int register_android_media_MediaScanner(JNIEnv *env);
extern int register_android_media_ResampleInputStream(JNIEnv *env);
extern int register_android_media_MediaProfiles(JNIEnv *env);
extern int register_android_media_AmrInputStream(JNIEnv *env);
extern int register_android_mtp_MtpDatabase(JNIEnv *env);
extern int register_android_mtp_MtpDevice(JNIEnv *env);
extern int register_android_mtp_MtpServer(JNIEnv *env);

jint JNI_OnLoad(JavaVM* vm, void* reserved)
{
    JNIEnv* env = NULL;
    jint result = -1;

    if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) {
        LOGE("ERROR: GetEnv failed\n");
        goto bail;
    }
    assert(env != NULL);

    if (register_android_media_MediaPlayer(env) < 0) {
        LOGE("ERROR: MediaPlayer native registration failed\n");
        goto bail;
    }

    if (register_android_media_MediaRecorder(env) < 0) {
        LOGE("ERROR: MediaRecorder native registration failed\n");
        goto bail;
    }

    if (register_android_media_MediaScanner(env) < 0) {
        LOGE("ERROR: MediaScanner native registration failed\n");
        goto bail;
    }

    if (register_android_media_MediaMetadataRetriever(env) < 0) {
        LOGE("ERROR: MediaMetadataRetriever native registration failed\n");
        goto bail;
    }

    if (register_android_media_AmrInputStream(env) < 0) {
        LOGE("ERROR: AmrInputStream native registration failed\n");
        goto bail;
    }

    if (register_android_media_ResampleInputStream(env) < 0) {
        LOGE("ERROR: ResampleInputStream native registration failed\n");
        goto bail;
    }

    if (register_android_media_MediaProfiles(env) < 0) {
        LOGE("ERROR: MediaProfiles native registration failed");
        goto bail;
    }

    if (register_android_mtp_MtpDatabase(env) < 0) {
        LOGE("ERROR: MtpDatabase native registration failed");
        goto bail;
    }

    if (register_android_mtp_MtpDevice(env) < 0) {
        LOGE("ERROR: MtpDevice native registration failed");
        goto bail;
    }

    if (register_android_mtp_MtpServer(env) < 0) {
        LOGE("ERROR: MtpServer native registration failed");
        goto bail;
    }

    /* success -- return valid version number */
    result = JNI_VERSION_1_4;

bail:
    return result;
}

// KTHXBYE