87 lines
2.3 KiB
Objective-C
87 lines
2.3 KiB
Objective-C
//
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// MIKMIDIPitchBendChangeCommand.m
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// MIKMIDI
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//
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// Created by Andrew Madsen on 3/5/15.
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// Copyright (c) 2015 Mixed In Key. All rights reserved.
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//
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#import "MIKMIDIPitchBendChangeCommand.h"
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#import "MIKMIDIChannelVoiceCommand_SubclassMethods.h"
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#import "MIKMIDIUtilities.h"
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#if !__has_feature(objc_arc)
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#error MIKMIDIPitchBendChangeCommand.m must be compiled with ARC. Either turn on ARC for the project or set the -fobjc-arc flag for MIKMIDIPitchBendChangeCommand.m in the Build Phases for this target
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#endif
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@interface MIKMIDIPitchBendChangeCommand ()
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@end
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@implementation MIKMIDIPitchBendChangeCommand
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+ (void)load { [super load]; [MIKMIDICommand registerSubclass:self]; }
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+ (NSArray *)supportedMIDICommandTypes { return @[@(MIKMIDICommandTypePitchWheelChange)]; }
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+ (Class)immutableCounterpartClass; { return [MIKMIDIPitchBendChangeCommand class]; }
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+ (Class)mutableCounterpartClass; { return [MIKMutableMIDIPitchBendChangeCommand class]; }
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+ (BOOL)isMutable { return NO; }
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- (NSString *)additionalCommandDescription
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{
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return [NSString stringWithFormat:@"pitch change: %u", (unsigned)self.pitchChange];
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}
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#pragma mark - Properties
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- (UInt16)pitchChange
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{
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UInt16 ms7 = (self.dataByte2 << 7) & 0x3F80;
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UInt16 ls7 = self.dataByte1 & 0x007F;
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return ms7 | ls7;
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}
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- (void)setPitchChange:(UInt16)pitchChange
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{
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if (![[self class] isMutable]) return MIKMIDI_RAISE_MUTATION_ATTEMPT_EXCEPTION;
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pitchChange = MIN(pitchChange, 0x3FFF);
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self.dataByte1 = pitchChange & 0x007F;
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self.dataByte2 = (pitchChange & 0x3F80) >> 7;
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}
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@end
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#pragma mark -
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@implementation MIKMutableMIDIPitchBendChangeCommand
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+ (BOOL)isMutable { return YES; }
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- (NSString *)description
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{
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return [NSString stringWithFormat:@"%@ channel %d", [super description], self.channel];
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}
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#pragma mark - Properties
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@dynamic pitchChange;
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// MIKMIDICommand already implements these. This keeps the compiler happy.
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@dynamic channel;
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@dynamic value;
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@dynamic timestamp;
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@dynamic dataByte1;
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@dynamic dataByte2;
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@dynamic midiTimestamp;
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@dynamic data;
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@dynamic commandType;
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- (void)setCommandType:(MIKMIDICommandType)commandType
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{
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if ([self.internalData length] < 2) [self.internalData increaseLengthBy:2-[self.internalData length]];
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UInt8 *data = (UInt8 *)[self.internalData mutableBytes];
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data[0] &= 0x0F | (commandType & 0xF0); // Need to avoid changing channel
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}
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@end |