/* * 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; } } }