src.com.android.server.usb.descriptors.UsbMSMidiHeader Maven / Gradle / Ivy

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/*
 * Copyright (C) 2017 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 com.android.server.usb.descriptors;

import com.android.server.usb.descriptors.report.ReportCanvas;

/**
 * @hide
 * An audio class-specific Midi Streaming Interface.
 * see midi10.pdf section 6.1.2.1
 */
public final class UsbMSMidiHeader extends UsbACInterface {
    private static final String TAG = "UsbMSMidiHeader";

    private int mMidiStreamingClass;  // MSC Specification Release (BCD).

    public UsbMSMidiHeader(int length, byte type, byte subtype, int subclass) {
        super(length, type, subtype, subclass);
    }

    public int getMidiStreamingClass() {
        return mMidiStreamingClass;
    }

    @Override
    public int parseRawDescriptors(ByteStream stream) {
        mMidiStreamingClass = stream.unpackUsbShort();
        stream.advance(mLength - stream.getReadCount());
        return mLength;
    }

    @Override
    public void report(ReportCanvas canvas) {
        super.report(canvas);

        canvas.writeHeader(3, "MS Midi Header: " + ReportCanvas.getHexString(getType())
                + " SubType: " + ReportCanvas.getHexString(getSubclass())
                + " Length: " + getLength()
                + " MidiStreamingClass :" + getMidiStreamingClass());
    }
}