如何在音频文件中添加艺术品,以显示在专辑封面中?
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【中文标题】如何在音频文件中添加艺术品,以显示在专辑封面中?【英文标题】:How to add artwork in audio file, to show in album cover? 【发布时间】:2014-07-22 05:57:29 【问题描述】:我有一个音频文件,想更改其专辑封面插图。那么,有可能吗?还有,如何在 ios 编程中为音频文件设置专辑封面的插图?
实际上,我合并了两个音频文件,并想添加将在 iTune 中显示的专辑封面的插图。
代码如下:
- (BOOL) combineVoices1
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSString *libraryCachesDirectory = [paths objectAtIndex:0];
libraryCachesDirectory = [libraryCachesDirectory stringByAppendingPathComponent:@"Caches"];
NSString *OutputFilePath = [libraryCachesDirectory stringByAppendingFormat:@"/%@.m4a",textFieldMixFile.text];
NSURL *audioFileOutput = [NSURL fileURLWithPath:OutputFilePath];
NSURL *audioFileInput1= audioFileURL1;//<Path of orignal audio file>
NSURL *audioFileInput2= audioFileURL2;//<Path of orignal audio file>
if (!audioFileInput1 || !audioFileInput2 || !audioFileOutput)
return NO;
[[NSFileManager defaultManager] removeItemAtURL:audioFileOutput error:NULL];
//CMTime nextClipStartTime = kCMTimeZero;
AVMutableComposition *composition = [[AVMutableComposition alloc] init];
AVMutableCompositionTrack *compositionAudioTrack = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
CMTime nextClipStartTimeMix1;
if (playbackDelayAfterTimeMix1 > 0)
nextClipStartTimeMix1 = CMTimeMake(playbackDelayAfterTimeMix1, 1);
else
nextClipStartTimeMix1 = kCMTimeZero;
CMTime startTimeMix1;
if (playbackDelayMix1 > 0)
startTimeMix1 = CMTimeMake(playbackDelayMix1, 1);
else
startTimeMix1 = kCMTimeZero;
[compositionAudioTrack setPreferredVolume:[NSTSharedData instance].volumeOfMIX1];
NSURL *url = audioFileURL1; //[NSURL fileURLWithPath:soundOne];
AVAsset *avAsset = [AVURLAsset URLAssetWithURL:url options:nil];
NSArray *tracks = [avAsset tracksWithMediaType:AVMediaTypeAudio];
AVAssetTrack *clipAudioTrack;
if (tracks.count > 0)
clipAudioTrack = [[avAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
else
return NO;
[compositionAudioTrack insertTimeRange:CMTimeRangeMake(startTimeMix1, avAsset.duration) ofTrack:clipAudioTrack atTime:nextClipStartTimeMix1 error:nil];
//avAsset.commonMetadata
AVMutableCompositionTrack *compositionAudioTrack1 = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
CMTime nextClipStartTimeMix2;
if (playbackDelayAfterTimeMix2 > 0)
nextClipStartTimeMix2 = CMTimeMake(playbackDelayAfterTimeMix2, 1);
else
nextClipStartTimeMix2 = kCMTimeZero;
CMTime startTimeMix2;
if (playbackDelayMix2 > 0)
startTimeMix2 = CMTimeMake(playbackDelayMix2, 1);
else
startTimeMix2 = kCMTimeZero;
[compositionAudioTrack1 setPreferredVolume:[NSTSharedData instance].volumeOfMIX2];
//NSString *soundOne1 =[[NSBundle mainBundle]pathForResource:@"test" ofType:@"caf"];
NSURL *url1 = audioFileURL2; //[NSURL fileURLWithPath:soundOne1];
AVAsset *avAsset1 = [AVURLAsset URLAssetWithURL:url1 options:nil];
NSArray *tracks1 = [avAsset1 tracksWithMediaType:AVMediaTypeAudio];
AVAssetTrack *clipAudioTrack1;
if (tracks1.count > 0)
clipAudioTrack1 = [[avAsset1 tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
else
return NO;
[compositionAudioTrack1 insertTimeRange:CMTimeRangeMake(startTimeMix2, avAsset1.duration) ofTrack:clipAudioTrack1 atTime:nextClipStartTimeMix2 error:nil];
AVAssetExportSession *exportSession = [AVAssetExportSession
exportSessionWithAsset:composition
presetName:AVAssetExportPresetAppleM4A];
if (nil == exportSession) return NO;
exportSession.outputURL = audioFileOutput;
exportSession.outputFileType = AVFileTypeAppleM4A;
[exportSession exportAsynchronouslyWithCompletionHandler:^
if (AVAssetExportSessionStatusCompleted == exportSession.status)
[self performSelectorOnMainThread:@selector(performAction) withObject:nil waitUntilDone:NO];
else if (AVAssetExportSessionStatusFailed == exportSession.status)
[self performSelectorOnMainThread:@selector(hideSpinningWheel) withObject:nil waitUntilDone:NO];
[[NSTSharedData instance] showAlertForTitle:@"Error!" andMessage:[NSString stringWithFormat:@"%@",[[exportSession error] localizedDescription]]];
//NSLog(@"Export failed: %@", [[exportSession error] localizedDescription]);
];
return YES;
【问题讨论】:
您查看了什么?有代码了吗? 我猜是有可能的,大概是用这个类AVURLAsset
,AVMetadataItem
。
我合并了两个音频文件,并希望为该合并文件添加插图。哪个(艺术作品)将在 iTune 中显示。
【参考方案1】:
我解决了我的问题,现在它工作正常,我在上面的代码中的“AVAssetExportSession”附近添加了代码。最后的方法是:
- (BOOL) combineVoices1
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSString *libraryCachesDirectory = [paths objectAtIndex:0];
libraryCachesDirectory = [libraryCachesDirectory stringByAppendingPathComponent:@"Caches"];
NSString *OutputFilePath = [libraryCachesDirectory stringByAppendingFormat:@"/%@.m4a",textFieldMixFile.text];
NSURL *audioFileOutput = [NSURL fileURLWithPath:OutputFilePath];
NSURL *audioFileInput1= audioFileURL1;//<Path of orignal audio file>
NSURL *audioFileInput2= audioFileURL2;//<Path of orignal audio file>
if (!audioFileInput1 || !audioFileInput2 || !audioFileOutput)
return NO;
[[NSFileManager defaultManager] removeItemAtURL:audioFileOutput error:NULL];
//CMTime nextClipStartTime = kCMTimeZero;
AVMutableComposition *composition = [[AVMutableComposition alloc] init];
AVMutableCompositionTrack *compositionAudioTrack = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
CMTime nextClipStartTimeMix1;
if (playbackDelayAfterTimeMix1 > 0)
nextClipStartTimeMix1 = CMTimeMake(playbackDelayAfterTimeMix1, 1);
else
nextClipStartTimeMix1 = kCMTimeZero;
CMTime startTimeMix1;
if (playbackDelayMix1 > 0)
startTimeMix1 = CMTimeMake(playbackDelayMix1, 1);
else
startTimeMix1 = kCMTimeZero;
[compositionAudioTrack setPreferredVolume:[NSTSharedData instance].volumeOfMIX1];
NSURL *url = audioFileURL1; //[NSURL fileURLWithPath:soundOne];
AVAsset *avAsset = [AVURLAsset URLAssetWithURL:url options:nil];
NSArray *tracks = [avAsset tracksWithMediaType:AVMediaTypeAudio];
AVAssetTrack *clipAudioTrack;
if (tracks.count > 0)
clipAudioTrack = [[avAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
else
return NO;
[compositionAudioTrack insertTimeRange:CMTimeRangeMake(startTimeMix1, avAsset.duration) ofTrack:clipAudioTrack atTime:nextClipStartTimeMix1 error:nil];
//avAsset.commonMetadata
AVMutableCompositionTrack *compositionAudioTrack1 = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
CMTime nextClipStartTimeMix2;
if (playbackDelayAfterTimeMix2 > 0)
nextClipStartTimeMix2 = CMTimeMake(playbackDelayAfterTimeMix2, 1);
else
nextClipStartTimeMix2 = kCMTimeZero;
CMTime startTimeMix2;
if (playbackDelayMix2 > 0)
startTimeMix2 = CMTimeMake(playbackDelayMix2, 1);
else
startTimeMix2 = kCMTimeZero;
[compositionAudioTrack1 setPreferredVolume:[NSTSharedData instance].volumeOfMIX2];
//NSString *soundOne1 =[[NSBundle mainBundle]pathForResource:@"test" ofType:@"caf"];
NSURL *url1 = audioFileURL2; //[NSURL fileURLWithPath:soundOne1];
AVAsset *avAsset1 = [AVURLAsset URLAssetWithURL:url1 options:nil];
NSArray *tracks1 = [avAsset1 tracksWithMediaType:AVMediaTypeAudio];
AVAssetTrack *clipAudioTrack1;
if (tracks1.count > 0)
clipAudioTrack1 = [[avAsset1 tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
else
return NO;
[compositionAudioTrack1 insertTimeRange:CMTimeRangeMake(startTimeMix2, avAsset1.duration) ofTrack:clipAudioTrack1 atTime:nextClipStartTimeMix2 error:nil];
/**
added MetadataItem
**/
AVMutableMetadataItem *artistMetadata = [[AVMutableMetadataItem alloc] init];
artistMetadata.key = AVMetadataiTunesMetadataKeyArtist;
artistMetadata.keySpace = AVMetadataKeySpaceiTunes;
artistMetadata.locale = [NSLocale currentLocale];
artistMetadata.value = uTakeTheMicArtist;
AVMutableMetadataItem *albumMetadata = [[AVMutableMetadataItem alloc] init];
albumMetadata.key = AVMetadataiTunesMetadataKeyAlbum;
albumMetadata.keySpace = AVMetadataKeySpaceiTunes;
albumMetadata.locale = [NSLocale currentLocale];
albumMetadata.value = uTakeTheMicAlbum;
AVMutableMetadataItem *songMetadata = [[AVMutableMetadataItem alloc] init];
songMetadata.key = AVMetadataiTunesMetadataKeySongName;
songMetadata.keySpace = AVMetadataKeySpaceiTunes;
songMetadata.locale = [NSLocale currentLocale];
songMetadata.value = textFieldMixFile.text;
AVMutableMetadataItem *imageMetadata = [[AVMutableMetadataItem alloc] init];
imageMetadata.key = AVMetadataiTunesMetadataKeyCoverArt;
imageMetadata.keySpace = AVMetadataKeySpaceiTunes;
imageMetadata.locale = [NSLocale currentLocale];
imageMetadata.value = imageData; //imageData is NSData of UIImage.
NSArray *metadata = [NSArray arrayWithObjects:artistMetadata, albumMetadata, songMetadata, imageMetadata, nil];
AVAssetExportSession *exportSession = [AVAssetExportSession
exportSessionWithAsset:composition
presetName:AVAssetExportPresetAppleM4A];
if (nil == exportSession) return NO;
exportSession.metadata = metadata;
exportSession.outputURL = audioFileOutput;
exportSession.outputFileType = AVFileTypeAppleM4A;
[exportSession exportAsynchronouslyWithCompletionHandler:^
if (AVAssetExportSessionStatusCompleted == exportSession.status)
[self performSelectorOnMainThread:@selector(performAction) withObject:nil waitUntilDone:NO];
else if (AVAssetExportSessionStatusFailed == exportSession.status)
[self performSelectorOnMainThread:@selector(hideSpinningWheel) withObject:nil waitUntilDone:NO];
[[NSTSharedData instance] showAlertForTitle:@"Error!" andMessage:[NSString stringWithFormat:@"%@.",[[exportSession error] localizedDescription]]];
//NSLog(@"Export failed: %@", [[exportSession error] localizedDescription]);
];
return YES;
【讨论】:
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