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/*
* Copyright (C) 2014 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.
*/
package android.midi;
import android.util.Log;
/**
* Class containing miscellaneous MIDI utilities.
*
* @hide
*/
public final class MidiUtils {
private static final String TAG = "MidiUtils";
private MidiUtils() { }
/**
* Returns data size of a MIDI message based on the message's command byte
* @param b the message command byte
* @return the message's data length
*/
public static int getMessageDataSize(byte b) {
switch (b & 0xF0) {
case 0x80:
case 0x90:
case 0xA0:
case 0xB0:
case 0xE0:
return 2;
case 0xC0:
case 0xD0:
return 1;
case 0xF0:
switch (b & 0x0F) {
case 0x00:
Log.e(TAG, "System Exclusive not supported yet");
return -1;
case 0x01:
case 0x03:
return 1;
case 0x02:
return 2;
default:
return 0;
}
default:
Log.e(TAG, "unknown MIDI command " + b);
return -1;
}
}
}
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