Code example for Equalizer

Methods: getCurrentPreset, getNumberOfPresets, getPresetName, release, usePreset

0
    public void test1_2Presets() throws Exception { 
        boolean result = false;
        String msg = "test1_2Presets()";
        getEqualizer(0); 
        try { 
            short numPresets = mEqualizer.getNumberOfPresets();
            assertTrue(msg + ": getNumberOfPresets failed", numPresets >= MIN_NUMBER_OF_PRESETS);
            mEqualizer.usePreset((short)(numPresets - 1));
            short preset = mEqualizer.getCurrentPreset();
            assertEquals(msg + ": usePreset failed", preset, (short)(numPresets - 1));
            String name = mEqualizer.getPresetName(preset);
            assertNotNull(msg + ": getPresetName failed", name);
            result = true;
        } catch (IllegalArgumentException e) {
            msg = msg.concat(": Bad parameter value");
            loge(msg, "Bad parameter value");
        } catch (UnsupportedOperationException e) {
            msg = msg.concat(": get parameter() rejected");
            loge(msg, "get parameter() rejected");
        } catch (IllegalStateException e) {
            msg = msg.concat("get parameter() called in wrong state");
            loge(msg, "get parameter() called in wrong state");
        } finally { 
            releaseEqualizer(); 
        } 
        assertTrue(msg, result);
    } 
 
    //Test case 1.3: test properties 
    @LargeTest 
    public void test1_3Properties() throws Exception { 
        boolean result = false;
        String msg = "test1_3Properties()";
        getEqualizer(0); 
        try { 
            Equalizer.Settings settings = mEqualizer.getProperties();
            String str = settings.toString();
            settings = new Equalizer.Settings(str);
            mEqualizer.setProperties(settings);
            result = true;
        } catch (IllegalArgumentException e) {
            msg = msg.concat(": Bad parameter value");
            loge(msg, "Bad parameter value");
        } catch (UnsupportedOperationException e) {
            msg = msg.concat(": get parameter() rejected");
            loge(msg, "get parameter() rejected");
        } catch (IllegalStateException e) {
            msg = msg.concat("get parameter() called in wrong state");
            loge(msg, "get parameter() called in wrong state");
        } finally { 
            releaseEqualizer(); 
        } 
        assertTrue(msg, result);
    } 
 
    //----------------------------------------------------------------- 
    // 2 - Effect action 
    //---------------------------------- 
 
    //Test case 2.0: test that the equalizer actually alters the sound 
    @LargeTest 
    public void test2_0SoundModification() throws Exception { 
        boolean result = false;
        String msg = "test2_0SoundModification()";
        EnergyProbe probe = null;
        AudioEffect vc = null;
        MediaPlayer mp = null;
        AudioManager am = (AudioManager) getActivity().getSystemService(Context.AUDIO_SERVICE);
        int volume = am.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
        am.setStreamVolume(AudioManager.STREAM_MUSIC,
                           TEST_VOLUME,
                           0); 
        try { 
            probe = new EnergyProbe(0);
            // creating a volume controller on output mix ensures that ro.audio.silent mutes 
            // audio after the effects and not before 
            vc = new AudioEffect(
                    AudioEffect.EFFECT_TYPE_NULL, 
                    UUID.fromString("119341a0-8469-11df-81f9-0002a5d5c51b"),
                      0, 
                      0); 
            vc.setEnabled(true);
 
            mp = new MediaPlayer();
            mp.setDataSource(MediaNames.SINE_200_1000);
            mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
            getEqualizer(mp.getAudioSessionId());
            mp.prepare();
            mp.start();
            Thread.sleep(500);
            // measure reference energy around 1kHz 
            int refEnergy = probe.capture(1000);
            short band = mEqualizer.getBand(1000000);
            short[] levelRange = mEqualizer.getBandLevelRange();
            mEqualizer.setBandLevel(band, levelRange[0]);
            mEqualizer.setEnabled(true);
            Thread.sleep(500);
            // measure energy around 1kHz with band level at min 
            int energy = probe.capture(1000);
            assertTrue(msg + ": equalizer has no effect at 1kHz", energy < refEnergy/4);
            result = true;
        } catch (IllegalArgumentException e) {
            msg = msg.concat(": Bad parameter value");
            loge(msg, "Bad parameter value");
        } catch (UnsupportedOperationException e) {
            msg = msg.concat(": get parameter() rejected");
            loge(msg, "get parameter() rejected");
        } catch (IllegalStateException e) {
            msg = msg.concat("get parameter() called in wrong state");
            loge(msg, "get parameter() called in wrong state");
        } catch (InterruptedException e) {
            loge(msg, "sleep() interrupted");
        } 
        finally { 
            releaseEqualizer(); 
            if (mp != null) {
                mp.release();
            } 
            if (vc != null) {
                vc.release();
            } 
            if (probe != null) {
                probe.release();
            } 
            am.setStreamVolume(AudioManager.STREAM_MUSIC, volume, 0);
        } 
        assertTrue(msg, result);
    } 
 
    //----------------------------------------------------------------- 
    // private methods 
    //---------------------------------- 
 
    private void getEqualizer(int session) {
         if (mEqualizer == null || session != mSession) {
             if (session != mSession && mEqualizer != null) {
                 mEqualizer.release();
                 mEqualizer = null;
             } 
             try { 
                mEqualizer = new Equalizer(0, session);
                mSession = session;
            } catch (IllegalArgumentException e) {
                Log.e(TAG, "getEqualizer() Equalizer not found exception: "+e);
            } catch (UnsupportedOperationException e) {
                Log.e(TAG, "getEqualizer() Effect library not loaded exception: "+e);
            } 
         } 
         assertNotNull("could not create mEqualizer", mEqualizer);
    } 
 
    private void releaseEqualizer() { 
        if (mEqualizer != null) {
            mEqualizer.release();
            mEqualizer = null;
        } 
   } 
 
}