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137 lines
3.3 KiB
137 lines
3.3 KiB
/*
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* Copyright 2011 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.levien.synthesizer.core.midi;
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import java.util.EnumSet;
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/**
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* MidiHeader is a container for the information in the header of a .mid or .smf file.
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*/
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public class MidiHeader {
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/**
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* An enumeration of the kinds of formats a midi file can have, along with the number that
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* represents that format in the serialized header.
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*/
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public enum Format {
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SINGLE_TRACK (0),
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MULTIPLE_TRACKS_SYNCH (1),
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MULTIPLE_TRACKS_ASYNCH (2);
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Format(int index) {
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index_ = index;
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}
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/**
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* Converts the integer value you would see in the file's header into the enum value.
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*/
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public static Format valueOf(int index) {
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for (Format format : EnumSet.allOf(Format.class)) {
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if (format.index_ == index) {
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return format;
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}
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}
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throw new ArrayIndexOutOfBoundsException(index);
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}
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private int index_;
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}
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/**
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* Creates an empty header.
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*/
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public MidiHeader() {
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}
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/**
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* @return The format of the file.
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*/
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public Format getFormat() {
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return format_;
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}
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/**
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* @return The number of tracks in the file.
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*/
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public int getTrackCount() {
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return trackCount_;
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}
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/**
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* The number of midi event ticks per "beat", along with the tempo in beats-per-minute, allows
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* mapping the ticks into real time. The tempo may change from onSetTempo events, but this value
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* will stay constant.
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* @return The number of midi event ticks per "beat".
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*/
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public int getTicksPerBeat() {
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return ticksPerBeat_;
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}
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/**
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* TODO(klimt): Unused until SMPTE time information is supported.
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*/
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public int getFramesPerSecond() {
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return framesPerSecond_;
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}
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/**
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* TODO(klimt): Unused until SMPTE time information is supported.
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*/
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public int getTicksPerFrame() {
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return ticksPerFrame_;
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}
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/**
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* Sets the format of the file.
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*/
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public void setFormat(Format format) {
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format_ = format;
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}
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/**
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* Sets the number of tracks in the file.
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*/
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public void setTrackCount(int trackCount) {
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trackCount_ = trackCount;
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}
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/**
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* Sets the number of ticks per beat for the file.
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*/
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public void setTicksPerBeat(int ticksPerBeat) {
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ticksPerBeat_ = ticksPerBeat;
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}
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/**
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* TODO(klimt): Unused until SMPTE time information is supported.
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*/
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public void setFramesPerSecond(int framesPerSecond) {
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framesPerSecond_ = framesPerSecond;
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}
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/**
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* TODO(klimt): Unused until SMPTE time information is supported.
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*/
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public void setTicksPerFrame(int ticksPerFrame) {
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ticksPerFrame_ = ticksPerFrame;
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}
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private Format format_;
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private int trackCount_;
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private int ticksPerBeat_;
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private int framesPerSecond_;
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private int ticksPerFrame_;
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}
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