97 lines
2.3 KiB
Plaintext
97 lines
2.3 KiB
Plaintext
//
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// MIDIMetadataReader.mm
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// MIDI
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//
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// Created by Christopher Snowhill on 10/16/13.
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// Copyright 2013 __NoWork, Inc__. All rights reserved.
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//
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#import "MIDIMetadataReader.h"
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#import "MIDIDecoder.h"
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#import <midi_processing/midi_processor.h>
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@implementation MIDIMetadataReader
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+ (NSArray *)fileTypes
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{
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return [MIDIDecoder fileTypes];
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}
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+ (NSArray *)mimeTypes
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{
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return [MIDIDecoder mimeTypes];
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}
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+ (float)priority
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{
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return 1.0f;
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}
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+ (NSDictionary *)metadataForURL:(NSURL *)url
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{
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id audioSourceClass = NSClassFromString(@"AudioSource");
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id<CogSource> source = [audioSourceClass audioSourceForURL:url];
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if (![source open:url])
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return 0;
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if (![source seekable])
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return 0;
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[source seek:0 whence:SEEK_END];
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long size = [source tell];
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[source seek:0 whence:SEEK_SET];
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std::vector<uint8_t> data;
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data.resize( size );
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[source read:&data[0] amount:size];
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midi_container midi_file;
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if ( !midi_processor::process_file( data, [[url pathExtension] UTF8String], midi_file) )
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return 0;
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int track_num;
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if ([[url fragment] length] == 0)
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track_num = 0;
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else
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track_num = [[url fragment] intValue];
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midi_meta_data metadata;
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midi_file.get_meta_data( track_num, metadata );
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midi_meta_data_item item;
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bool remap_display_name = !metadata.get_item( "title", item );
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NSArray * allowedKeys = @[@"title", @"artist", @"album", @"year"];
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NSMutableDictionary * dict = [NSMutableDictionary dictionaryWithCapacity:10];
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for ( size_t i = 0; i < metadata.get_count(); ++i )
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{
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const midi_meta_data_item & item = metadata[ i ];
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NSString * name = [[NSString stringWithUTF8String:item.m_name.c_str()] lowercaseString];
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if ( ![name isEqualToString:@"type"] )
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{
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if ( remap_display_name && [name isEqualToString:@"display_name"] )
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name = @"title";
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if ( [allowedKeys containsObject:name] )
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[dict setObject:[NSString stringWithUTF8String:item.m_value.c_str()] forKey:name];
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}
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}
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std::vector<uint8_t> albumArt;
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if ( metadata.get_bitmap( albumArt ) )
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{
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[dict setObject:[NSData dataWithBytes:&albumArt[0] length:albumArt.size()] forKey:@"albumArt"];
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}
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return dict;
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}
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@end
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