una - Android: cómo cambiar la velocidad de reproducción de la música con OpenSL ES

music speed changer online

Question

Estoy trabajando en un reproductor de música en el que necesito cambiar el tempo (velocidad de reproducción de la música) sin cambiar el tono.

No puedo encontrar ninguna clase nativa de Android para hacerlo. Probé SoundPool pero no funciona con archivos de música grandes y tampoco parece funcionar en muchos dispositivos. También probé AudioTrack pero nuevamente no tuve suerte.

Ahora estoy probando el ejemplo de audio NDK de Android que usa OpenSL ES para manejar música. Ahora solo quiero agregar la función de velocidad de reproducción establecida en este ejemplo.

¿Alguien me puede mostrar cómo agrego la función de cambio de velocidad de reproducción?

Answer 1

Esto puede ser de alguna ayuda (tomado de la documentación de NDK OpenSL):

Tasa de reproducción

Los rangos de velocidad de reproducción admitidos y las capacidades pueden variar según la versión de la plataforma y la implementación, por lo que deben determinarse en tiempo de ejecución consultando con PlaybackRate :: GetRateRange o PlaybackRate :: GetCapabilitiesOfRate.

Dicho esto, algunas orientaciones sobre los rangos de frecuencia típicos pueden ser útiles: en Android 2.3, se admite típicamente un solo rango de velocidad de reproducción de 500 por mil a 2000 por mil inclusive, con la propiedad SL_RATEPROP_NOPITCHCORAUDIO. En Android 4.0, el mismo rango de velocidad generalmente se admite para una fuente de datos en formato PCM, y un rango de velocidad de unidad para otros formatos.

Answer 2

He solucionado mi problema. Aquí está mi código nativo completo para OpenSL ES en caso de que alguien necesite esto:

#include <jni.h>

#include<android/log.h>
// LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -llog 넣어주세요
#define LOGV(...) __android_log_print(ANDROID_LOG_VERBOSE, "OSLESMediaPlayer", __VA_ARGS__) 
#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG  , "OSLESMediaPlayer", __VA_ARGS__) 
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO   , "OSLESMediaPlayer", __VA_ARGS__) 
#define LOGW(...) __android_log_print(ANDROID_LOG_WARN   , "OSLESMediaPlayer", __VA_ARGS__) 
#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR  , "OSLESMediaPlayer", __VA_ARGS__) 

// for native audio
#include <SLES/OpenSLES.h>
#include <SLES/OpenSLES_Android.h>

#include <assert.h>
#include <sys/types.h>

// engine interfaces
static SLObjectItf engineObject = NULL;
static SLEngineItf engineEngine;

// URI player interfaces
static SLObjectItf uriPlayerObject = NULL;
static SLPlayItf uriPlayerPlay;
static SLSeekItf uriPlayerSeek;
static SLPlaybackRateItf uriPlaybackRate;

// output mix interfaces
static SLObjectItf outputMixObject = NULL;

// playback rate (default 1x:1000)
static SLpermille playbackMinRate = 500;
static SLpermille playbackMaxRate = 2000;
static SLpermille playbackRateStepSize;

//Pitch
static SLPitchItf uriPlaybackPitch;
static SLpermille playbackMinPitch = 500;
static SLpermille playbackMaxPitch = 2000;

// create the engine and output mix objects
JNIEXPORT void Java_com_swssm_waveloop_audio_OSLESMediaPlayer_createEngine(
        JNIEnv* env, jclass clazz) {
    SLresult result;

    // create engine
    LOGD("create engine");
    result = slCreateEngine(&engineObject, 0, NULL, 0, NULL, NULL);
    assert(SL_RESULT_SUCCESS == result);

    // realize the engine
    LOGD("realize the engine");
    result = (*engineObject)->Realize(engineObject, SL_BOOLEAN_FALSE);
    assert(SL_RESULT_SUCCESS == result);

    // get the engine interface, which is needed in order to create other objects
    LOGD("get the engine interface");
    result = (*engineObject)->GetInterface(engineObject, SL_IID_ENGINE,
            &engineEngine);
    assert(SL_RESULT_SUCCESS == result);

    // create output mix, with environmental reverb specified as a non-required interface
    LOGD("create output mix");
    const SLInterfaceID ids[1] = {SL_IID_PLAYBACKRATE};
    const SLboolean req[1] = {SL_BOOLEAN_FALSE};
    result = (*engineEngine)->CreateOutputMix(engineEngine, &outputMixObject, 1,
            ids, req);
    assert(SL_RESULT_SUCCESS == result);

    // realize the output mix
    LOGD("realize the output mix");
    result = (*outputMixObject)->Realize(outputMixObject, SL_BOOLEAN_FALSE);
    assert(SL_RESULT_SUCCESS == result);

}

JNIEXPORT void Java_com_swssm_waveloop_audio_OSLESMediaPlayer_releaseEngine(
        JNIEnv* env, jclass clazz) {
    // destroy URI audio player object, and invalidate all associated interfaces
    if (uriPlayerObject != NULL) {
        (*uriPlayerObject)->Destroy(uriPlayerObject);
        uriPlayerObject = NULL;
        uriPlayerPlay = NULL;
        uriPlayerSeek = NULL;
    }

    // destroy output mix object, and invalidate all associated interfaces
    if (outputMixObject != NULL) {
        (*outputMixObject)->Destroy(outputMixObject);
        outputMixObject = NULL;
    }

    // destroy engine object, and invalidate all associated interfaces
    if (engineObject != NULL) {
        (*engineObject)->Destroy(engineObject);
        engineObject = NULL;
        engineEngine = NULL;
    }

}

/*
 void OnCompletion(JNIEnv* env, jclass clazz)
 {
 jclass cls = env->GetObjectClass(thiz);
 if (cls != NULL)
 {
 jmethodID mid = env->GetMethodID(cls, "OnCompletion", "()V");
 if (mid != NULL)
 {
 env->CallVoidMethod(thiz, mid, 1234);
 }
 }
 }*/

void playStatusCallback(SLPlayItf play, void* context, SLuint32 event) {
    //LOGD("playStatusCallback");
}

// create URI audio player
JNIEXPORT jboolean Java_com_swssm_waveloop_audio_OSLESMediaPlayer_createAudioPlayer(
        JNIEnv* env, jclass clazz, jstring uri) {
    SLresult result;

    // convert Java string to UTF-8
    const jbyte *utf8 = (*env)->GetStringUTFChars(env, uri, NULL);
    assert(NULL != utf8);

    // configure audio source
    // (requires the INTERNET permission depending on the uri parameter)
    SLDataLocator_URI loc_uri = { SL_DATALOCATOR_URI, (SLchar *) utf8 };
    SLDataFormat_MIME format_mime = { SL_DATAFORMAT_MIME, NULL,
            SL_CONTAINERTYPE_UNSPECIFIED };
    SLDataSource audioSrc = { &loc_uri, &format_mime };

    // configure audio sink
    SLDataLocator_OutputMix loc_outmix = { SL_DATALOCATOR_OUTPUTMIX,
            outputMixObject };
    SLDataSink audioSnk = { &loc_outmix, NULL };

    // create audio player
    const SLInterfaceID ids[2] = { SL_IID_SEEK, SL_IID_PLAYBACKRATE };
    const SLboolean req[2] = { SL_BOOLEAN_FALSE, SL_BOOLEAN_TRUE };
    result = (*engineEngine)->CreateAudioPlayer(engineEngine, &uriPlayerObject,
            &audioSrc, &audioSnk, 2, ids, req);
    // note that an invalid URI is not detected here, but during prepare/prefetch on Android,
    // or possibly during Realize on other platforms
    assert(SL_RESULT_SUCCESS == result);

    // release the Java string and UTF-8
    (*env)->ReleaseStringUTFChars(env, uri, utf8);

    // realize the player
    result = (*uriPlayerObject)->Realize(uriPlayerObject, SL_BOOLEAN_FALSE);
    // this will always succeed on Android, but we check result for portability to other platforms
    if (SL_RESULT_SUCCESS != result) {
        (*uriPlayerObject)->Destroy(uriPlayerObject);
        uriPlayerObject = NULL;
        return JNI_FALSE;
    }

    // get the play interface
    result = (*uriPlayerObject)->GetInterface(uriPlayerObject, SL_IID_PLAY,
            &uriPlayerPlay);
    assert(SL_RESULT_SUCCESS == result);

    // get the seek interface
    result = (*uriPlayerObject)->GetInterface(uriPlayerObject, SL_IID_SEEK,
            &uriPlayerSeek);
    assert(SL_RESULT_SUCCESS == result);

    // get playback rate interface
    result = (*uriPlayerObject)->GetInterface(uriPlayerObject,
            SL_IID_PLAYBACKRATE, &uriPlaybackRate);
    assert(SL_RESULT_SUCCESS == result);

    /*  // get playback pitch interface
     result = (*uriPlayerObject)->GetInterface(uriPlayerObject, SL_IID_PITCH, &uriPlaybackPitch);
     assert(SL_RESULT_SUCCESS == result);*/

    // register callback function
    result = (*uriPlayerPlay)->RegisterCallback(uriPlayerPlay,
            playStatusCallback, 0);
    assert(SL_RESULT_SUCCESS == result);
    result = (*uriPlayerPlay)->SetCallbackEventsMask(uriPlayerPlay,
            SL_PLAYEVENT_HEADATEND); // head at end
    assert(SL_RESULT_SUCCESS == result);

    SLmillisecond msec;
    result = (*uriPlayerPlay)->GetDuration(uriPlayerPlay, &msec);
    assert(SL_RESULT_SUCCESS == result);

    // no loop
    result = (*uriPlayerSeek)->SetLoop(uriPlayerSeek, SL_BOOLEAN_TRUE, 0, msec);
    assert(SL_RESULT_SUCCESS == result);


    SLuint32 capa;
        result = (*uriPlaybackRate)->GetRateRange(uriPlaybackRate, 0,
                &playbackMinRate, &playbackMaxRate, &playbackRateStepSize, &capa);
        assert(SL_RESULT_SUCCESS == result);

        result = (*uriPlaybackRate)->SetPropertyConstraints(uriPlaybackRate,
                        SL_RATEPROP_PITCHCORAUDIO);

                    if (SL_RESULT_PARAMETER_INVALID == result) {
                        LOGD("Parameter Invalid");
                    }
                    if (SL_RESULT_FEATURE_UNSUPPORTED == result) {
                            LOGD("Feature Unsupported");
                        }
                    if (SL_RESULT_SUCCESS == result) {
                        assert(SL_RESULT_SUCCESS == result);
                            LOGD("Success");
                        }
    /*
     result = (*uriPlaybackPitch)->GetPitchCapabilities(uriPlaybackPitch, &playbackMinPitch, &playbackMaxPitch);
     assert(SL_RESULT_SUCCESS == result);*/

    /*
     SLpermille minRate, maxRate, stepSize, rate = 1000;
     SLuint32 capa;
     (*uriPlaybackRate)->GetRateRange(uriPlaybackRate, 0, &minRate, &maxRate, &stepSize, &capa);

     (*uriPlaybackRate)->SetRate(uriPlaybackRate, minRate);
     */
    return JNI_TRUE;
}

JNIEXPORT void Java_com_swssm_waveloop_audio_OSLESMediaPlayer_releaseAudioPlayer(
        JNIEnv* env, jclass clazz) {
    // destroy URI audio player object, and invalidate all associated interfaces
    if (uriPlayerObject != NULL) {
        (*uriPlayerObject)->Destroy(uriPlayerObject);
        uriPlayerObject = NULL;
        uriPlayerPlay = NULL;
        uriPlayerSeek = NULL;
        uriPlaybackRate = NULL;
    }

}

void setPlayState(SLuint32 state) {
    SLresult result;

    // make sure the URI audio player was created
    if (NULL != uriPlayerPlay) {

        // set the player''s state
        result = (*uriPlayerPlay)->SetPlayState(uriPlayerPlay, state);
        assert(SL_RESULT_SUCCESS == result);
    }

}

SLuint32 getPlayState() {
    SLresult result;

    // make sure the URI audio player was created
    if (NULL != uriPlayerPlay) {

        SLuint32 state;
        result = (*uriPlayerPlay)->GetPlayState(uriPlayerPlay, &state);
        assert(SL_RESULT_SUCCESS == result);

        return state;
    }

    return 0;

}

// play
JNIEXPORT void Java_com_swssm_waveloop_audio_OSLESMediaPlayer_play(JNIEnv* env,
        jclass clazz) {
    setPlayState(SL_PLAYSTATE_PLAYING);
}

// stop
JNIEXPORT void Java_com_swssm_waveloop_audio_OSLESMediaPlayer_stop(JNIEnv* env,
        jclass clazz) {
    setPlayState(SL_PLAYSTATE_STOPPED);
}

// pause
JNIEXPORT void Java_com_swssm_waveloop_audio_OSLESMediaPlayer_pause(JNIEnv* env,
        jclass clazz) {
    setPlayState(SL_PLAYSTATE_PAUSED);
}

// pause
JNIEXPORT jboolean Java_com_swssm_waveloop_audio_OSLESMediaPlayer_isPlaying(
        JNIEnv* env, jclass clazz) {
    return (getPlayState() == SL_PLAYSTATE_PLAYING);
}

// set position
JNIEXPORT void Java_com_swssm_waveloop_audio_OSLESMediaPlayer_seekTo(
        JNIEnv* env, jclass clazz, jint position) {
    if (NULL != uriPlayerPlay) {

        //SLuint32 state = getPlayState();
        //setPlayState(SL_PLAYSTATE_PAUSED);

        SLresult result;

        result = (*uriPlayerSeek)->SetPosition(uriPlayerSeek, position,
                SL_SEEKMODE_FAST);
        assert(SL_RESULT_SUCCESS == result);

        //setPlayState(state);
    }

}

// get duration
JNIEXPORT jint Java_com_swssm_waveloop_audio_OSLESMediaPlayer_getDuration(
        JNIEnv* env, jclass clazz) {
    if (NULL != uriPlayerPlay) {

        SLresult result;

        SLmillisecond msec;
        result = (*uriPlayerPlay)->GetDuration(uriPlayerPlay, &msec);
        assert(SL_RESULT_SUCCESS == result);

        return msec;
    }

    return 0.0f;
}

// get current position
JNIEXPORT jint Java_com_swssm_waveloop_audio_OSLESMediaPlayer_getPosition(
        JNIEnv* env, jclass clazz) {
    if (NULL != uriPlayerPlay) {

        SLresult result;

        SLmillisecond msec;
        result = (*uriPlayerPlay)->GetPosition(uriPlayerPlay, &msec);
        assert(SL_RESULT_SUCCESS == result);

        return msec;
    }

    return 0.0f;
}

//llllllllllllllllllll

JNIEXPORT void Java_com_swssm_waveloop_audio_OSLESMediaPlayer_setPitch(
        JNIEnv* env, jclass clazz, jint rate) {
    if (NULL != uriPlaybackPitch) {
        SLresult result;

        result = (*uriPlaybackPitch)->SetPitch(uriPlaybackPitch, rate);
        assert(SL_RESULT_SUCCESS == result);
    }
}

JNIEXPORT void Java_com_swssm_waveloop_audio_OSLESMediaPlayer_setRate(
        JNIEnv* env, jclass clazz, jint rate) {
    if (NULL != uriPlaybackRate) {
        SLresult result;

        result = (*uriPlaybackRate)->SetRate(uriPlaybackRate, rate);
            assert(SL_RESULT_SUCCESS == result);


    }
}

JNIEXPORT jint Java_com_swssm_waveloop_audio_OSLESMediaPlayer_getRate(
        JNIEnv* env, jclass clazz) {
    if (NULL != uriPlaybackRate) {
        SLresult result;

        SLpermille rate;
        result = (*uriPlaybackRate)->GetRate(uriPlaybackRate, &rate);
        assert(SL_RESULT_SUCCESS == result);

        return rate;
    }

    return 0;
}

// create URI audio player
JNIEXPORT jboolean Java_com_swssm_waveloop_audio_OSLESMediaPlayer_setLoop(
        JNIEnv* env, jclass clazz, jint startPos, jint endPos) {
    SLresult result;

    result = (*uriPlayerSeek)->SetLoop(uriPlayerSeek, SL_BOOLEAN_TRUE, startPos,
            endPos);
    assert(SL_RESULT_SUCCESS == result);

    return JNI_TRUE;
}

// create URI audio player
JNIEXPORT jboolean Java_com_swssm_waveloop_audio_OSLESMediaPlayer_setNoLoop(
        JNIEnv* env, jclass clazz) {
    SLresult result;
    if (NULL != uriPlayerSeek) {
        // enable whole file looping
        result = (*uriPlayerSeek)->SetLoop(uriPlayerSeek, SL_BOOLEAN_TRUE, 0,
                SL_TIME_UNKNOWN);
        assert(SL_RESULT_SUCCESS == result);

    }
    return JNI_TRUE;
}

Simplemente ndk-build usando el ndk-build y utilícelo. Si alguien tiene éxito en cambiar el tono, por favor dígame la solución.

Aquí está el archivo android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := audio-tools

LOCAL_SRC_FILES := OSLESMediaPlayer.c


LOCAL_CFLAGS := -DHAVE_CONFIG_H -DFPM_ARM -ffast-math -O3

LOCAL_LDLIBS    += -lOpenSLES -llog

include $(BUILD_SHARED_LIBRARY)

y el archivo Application.mk

APP_STL := gnustl_static
APP_CPPFLAGS += -fexceptions -frtti
APP_ABI := armeabi armeabi-v7a

Y la clase wrapper, puedes usar su función directamente en tu proyecto

package com.swssm.waveloop.audio;
public class OSLESMediaPlayer {
    public native void createEngine();
    public native void releaseEngine();
    public native boolean createAudioPlayer(String uri);
    public native void releaseAudioPlayer();
    public native void play();
    public native void stop();
    public native void pause();
    public native boolean isPlaying();

    public native void seekTo(int position);
    public native int getDuration();
    public native int getPosition();

    public native void setPitch(int rate);

    public native void setRate(int rate);
    public native int getRate();

    public native void setLoop( int startPos, int endPos );
    public native void setNoLoop();


    public interface OnCompletionListener {
        public void OnCompletion();
    }

    private OnCompletionListener mCompletionListener;
    public void SetOnCompletionListener( OnCompletionListener listener )
    {
        mCompletionListener = listener;
    }


    private void OnCompletion()
    {
        mCompletionListener.OnCompletion();

        int position = getPosition();
        int duration = getDuration();
        if( position != duration )
        {
            int a = 0;

        }
        else
        {
            int c = 0;

        }
    }
}