I want to play a specific playlist (that was constructed as an iMix) from my program, as long as it exists. I am able to use
[[MPMediaQuery albumsQuery] addFilterPredicate:[MPMediaPropertyPredicate predicateWithValue:#"MyAlbum" forProperty:MPMediaItemPropertyAlbumTitle]];
to get all songs in an album (as well as many other options for artists, etc.) but there seems to be no way to access playlists.
Is there a different way to do this, or will I be forced to store all the songs in the playlist within my code and access them all that way?
I haven't used it myself, but I see a [MPMediaQuery playlistsQuery] and MPMediaGroupingPlaylist in the docs...
Does this link help?
http://discussions.apple.com/thread.jspa?threadID=2084104&tstart=0&messageID=9838244
I ended up having to roll my own via a text file that contains playlist information. here is the code. The [Globals split] function just takes a string and splits it into an array of strings using either a single character ([Globals split: with:]) or each character in a string ([Globals split: withMany:]).
//Create the music player for our application.
musicPlayer = [MPMusicPlayerController applicationMusicPlayer];
[musicPlayer setShuffleMode: MPMusicShuffleModeOff];
[musicPlayer setRepeatMode: MPMusicRepeatModeAll];
//Get our song list from the text file.
NSError *error = nil;
NSString *songList = [NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"Playlist" ofType:#"txt"] encoding:NSUTF8StringEncoding error:&error];
//Split it into each song using newlines or carriage returns.
NSArray *allSongs = [Globals split:songList withMany:#"\r\n"];
NSMutableArray *music = [NSMutableArray arrayWithCapacity:[allSongs count]];
for (int i = 0; i < [allSongs count]; i++)
{
//Split the line into tab-delimited info: title, artist, album.
NSArray *songInfo = [Globals split:[allSongs objectAtIndex:i] with:'\t'];
//Get a query using all the data we have. This should return one song.
MPMediaQuery *songQuery = [MPMediaQuery songsQuery];
if ([songInfo count] > 0)
{
[songQuery addFilterPredicate:[MPMediaPropertyPredicate predicateWithValue:[songInfo objectAtIndex:0] forProperty:MPMediaItemPropertyTitle]];
}
if ([songInfo count] > 1)
{
[songQuery addFilterPredicate:[MPMediaPropertyPredicate predicateWithValue:[songInfo objectAtIndex:1] forProperty:MPMediaItemPropertyArtist]];
}
if ([songInfo count] > 2)
{
[songQuery addFilterPredicate:[MPMediaPropertyPredicate predicateWithValue:[songInfo objectAtIndex:2] forProperty:MPMediaItemPropertyAlbumTitle]];
}
//Add the song to our collection if we were able to find it.
NSArray *matching = [songQuery items];
if ([matching count] > 0)
{
[music addObject:[matching objectAtIndex:0]];
printf("Added in: %s\n",[(NSString *)[(MPMediaItem *)[matching objectAtIndex:0] valueForProperty:MPMediaItemPropertyTitle] UTF8String]);
}
else
{
printf("Couldn't add in: %s\n",[(NSString *)[songInfo objectAtIndex:0] UTF8String]);
}
}
//Now that we have a collection, make our playlist.
if ([music count] > 0)
{
itunesLoaded = YES;
// just get the first album with this name (there should only be one)
MPMediaItemCollection *itunesAlbum = [MPMediaItemCollection collectionWithItems:music];
//Shuffle our songs.
musicPlayer.shuffleMode = MPMusicShuffleModeSongs;
[musicPlayer setQueueWithItemCollection: itunesAlbum];
}
The text file is very easily generated using iTunes. All you need to do is create your playlist in iTunes, remove all the song info from your list except for Title, Artist, and Album, select all, and then paste into a text file. It will automatically be tab-delimitted and split by carriage returns. You also won't need to worry about mistyping or anything like that.
Related
I'm using MHVideoPhotoGallery to create gallery's of images that are stored on my website. The current way to add images (as shown in the example on Github) is
MHGalleryItem *photo1 = [MHGalleryItem.alloc initWithURL:#"*ENTER IMAGE URL HERE*"
galleryType:MHGalleryTypeImage];
MHGalleryItem *photo2 = [MHGalleryItem.alloc initWithURL:#"*ENTER IMAGE URL HERE*"
galleryType:MHGalleryTypeImage];
MHGalleryItem *photo3 = [MHGalleryItem.alloc initWithURL:#"*ENTER IMAGE URL HERE*"
galleryType:MHGalleryTypeImage];
self.galleryDataSource = #[#[photo1,photo2,photo3]];
But I want to add hundreds of images and this is not the most ideal way to do it. What would be an easier way for me to accomplish this?
Thanks!
You have to start with a list of the URLs. What I would do is put this in a text file in my bundle. In code, when the app runs, I would open the text file (as an NSString) and split it into an NSArray. Now I've got an NSArray of the URLs. I would then cycle through the NSArray. So now we're inside a loop. For each item the array, I would initialize the MHGalleryItem and then add it to a previously created NSMutableArray with addObject:. Thus we have a two or three-line loop which is repeated, running through all the URLs.
The following is pseudo-code and untested (so it might contain errors), but it should give the general idea of the structure I'm suggesting:
NSMutableArray* temp = [NSMutableArray new];
NSString* s =
[NSString stringWithContentsOfFile:
[[NSBundle mainBundle] pathForResource:#"urls" ofType:#"txt"]
encoding:NSUTF8StringEncoding error:nil];
NSArray* urls = [s componentsSeparatedByString:#"\n"];
for (NSString* url in urls) {
MHGalleryItem *item = [[MHGalleryItem alloc] initWithURL:url
galleryType:MHGalleryTypeImage];
[temp addObject:item];
}
self.galleryDataSource = temp;
Loop. If you're putting numbers at the end of your variable names, you need a loop and/or an array.
NSMutableArray * photos = [NSMutableArray new];
NSArray * photoPaths = [NSArray arrayWithContentsOfFile:plistContainingPhotoPaths];
for( NSString * path in photoPaths ){
NSURL * photoURL = [NSURL URLWithString:path];
MHGalleryItem * photo = [[MHGalleryItem alloc] initWithURL:photoURL
galleryType:MHGalleryTypeImage];
[photos addObject:photo];
}
And don't use dot syntax for alloc, or your code will burst into flames.
Use a naming protocol on your website such as:
www.mywebsite.com/appImageGallery/insertImageNumber
And replace the insertImageNumber with the number of you image. Then add this for loop to get all of the images and add them to the array.
NSMutableArray *mutableGalleryDataSource = [self.galleryDataSource mutableCopy]
for(int i = 0; i < numberOfImagesOnWebsite; i++){ //replace numberOfImagesOnWebsite with the number of images on your website.
MHGalleryItem *newItem = [MHGalleryItem.alloc initWithURL:[#"www.mywebsite.com/appImageGallery/" stringByAppendingString:[NSString stringWithFormat: #"%i", i]] galleryType:MHGalleryTypeImage];
[mutableGalleryDataSource addObject:newItem];
}
self.galleryDataSource = mutableGalleryDataSource;
There is also an -addObjectsFromArray method on NSMutableArray.
I have this code from which i am checking songs that are present in my app and storing the number of songs in an NSMUTABLEArray but there is something wrong it always shows null
for (int i = 1; i < 100; ++i) {
// Load the plist
NSString *plist = [[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:#"%d",i] ofType:#"mp3"];
if (nil == plist) {
NSLog(#"not found (%i)", i);
continue;
}
NSLog(#"Found Songs (%i)",i);
[MYNSMUTABLEArray addObject:[NSNumber numberWithInt:i]];
NSLog(#"%#",MYNSMUTABLEArray);
}
the i variable is working absolutely fine
You need to create your mutable array, so that an object exists to store the data. I presume that the code at the moment is sending the addObject: message to nil.
I'd strongly suggest a better variable name than MYNSMUTABLEArray, so here is my code snippit that should go before the loop.
NSMutableArray* myMutableArray = [NSMutableArray alloc] init];
Then where you are adding the object, you'd use:
[myMutableArray addObject:#(i)];
Bootnote: A little tip, you can use # literals to automatically box your primitive int value into an NSNumber object. This is used in the addObject: example, and is in the form #(int).
I'm now playing song from iPod Library that loaded into myArray with iPodMusicPlayer.
We can use indexOfNowPlayingItem to get index from NowPlaying music.
But when i Shuffle Mode is on, that indexOfNowPlayingItem Property's return index is completely wrong.
before ShuffleMode is off,indexOfNowPlayingItem can be used and correct.
However when ShuffleMode is on, indexOfNowPlayingItem count is only increase 1 (++).
like that
indexOfNowPlayingItem++;
Not a correct for ShuffleMode on.
So how can i get correct index when ShuffleMode on?
Thanks for your help.
My solution was when you set your playlist, set also a NSMutableDictionary with (index, MPMediaEntityPropertyPersistentID) of playlist.
When you need the song index, just get with the song persistent id.
- (void) setPlaylistIndexDictionary:(MPMediaItemCollection *)playlistItems
{
playlistIndexDict = [[NSMutableDictionary alloc] init];
NSNumber *count = [[NSNumber alloc] initWithInt:0];
for (MPMediaItem *item in [playlistItems items]) {
[playlistIndexDict setObject:count forKey:[item valueForProperty:MPMediaEntityPropertyPersistentID]];
count = [NSNumber numberWithInt:count.intValue + 1];
}
}
- (NSString *) getCurrentSongId
{
NSString* songId = [[musicPlayer nowPlayingItem] valueForProperty:MPMediaEntityPropertyPersistentID];
return songId;
}
Using:
NSString *songId = [musicController getCurrentSongId];
int songIndex = [[[musicController playlistIndexDict] objectForKey:songId] intValue];
I'm trying to fetch iTunes library in ios.
And trying to retrieve top 10 playcount song in 5days.
Could you tell me how to do? Here's my code.
MPMediaPropertyPredicate is not right answer...I guess.
MPMediaQuery *everything = [[MPMediaQuery alloc] init];
NSLog(#"Logging items from a generic query...");
NSArray *itemsFromGenericQuery = [everything items];
for (MPMediaItem *song in itemsFromGenericQuery) {
NSString *songTitle = [song valueForProperty: MPMediaItemPropertyTitle];
NSString *artistName = [song valueForProperty:MPMediaItemPropertyArtist];
NSString *lastPlayeddate = [song valueForProperty:MPMediaItemPropertyLastPlayedDate];
NSString *playCount = [song valueForProperty:MPMediaItemPropertyPlayCount];
NSLog (#"%#", songTitle);
text.text = [NSString stringWithFormat:#"%#\n%# %# %# %#", text.text, songTitle, artistName, lastPlayeddate, playCount];
}
All the best.
Apparently, play count is considered a "user defined" key, and therefore cannot be used in MPMediaPropertyPredicate
See http://developer.apple.com/library/ios/documentation/mediaplayer/reference/MPMediaItem_ClassReference/Reference/Reference.html#//apple_ref/doc/uid/TP40008211-CH1-SW38
You will have to iterate the songs and retrieve these properties manually.
enumerateValuesForProperties:usingBlock: is probably your most efficient option here.
http://developer.apple.com/library/ios/documentation/mediaplayer/reference/MPMediaEntity_ClassReference/Reference/Reference.html#//apple_ref/occ/instm/MPMediaEntity/enumerateValuesForProperties:usingBlock:
I'm developing an iphone 4 app that filters the local media library by different criteria. I have been able to filter by song name, artist, and genre. Now I need to add a rating filter mechanism. I was thinking in something like "rating >= N stars" (N:0..5)
The code I use to filter is:
allMedia = [MPMediaQuery songsQuery];
MPMediaPropertyPredicate *mpp1 = [MPMediaPropertyPredicate predicateWithValue:#"2" forProperty:MPMediaItemPropertyRating comparisonType:MPMediaPredicateComparisonEqualTo];
[allMedia addFilterPredicate:mpp1];
But MPMediaPropertyPredicate does not allow to filter by MPMediaItemPropertyRating (and actually it works ok with artist and song title).
2011-05-12 11:37:39.060 Radio3[1525:707] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'MPMediaPropertyPredicate cannot filter using the rating property.'
I google by MPMediaItemPropertyRating but it seems that I should find an alternative approach to filter by track rating.
Can somebody give me a tip?
thanks
UPDATE: This is my code to solve this:
allMedia = [MPMediaQuery songsQuery];
//MPMediaPropertyPredicate *mpp1 = [MPMediaPropertyPredicate predicateWithValue:#"2" forProperty:MPMediaItemPropertyRating comparisonType:MPMediaPredicateComparisonEqualTo];
//MPMediaPropertyPredicate *mpp2 = [MPMediaPropertyPredicate predicateWithValue:#"Pop" forProperty:MPMediaItemPropertyGenre comparisonType:MPMediaPredicateComparisonContains];
//[allMedia addFilterPredicate:mpp1];
//[allMedia addFilterPredicate:mpp2];
//[myPlayer setQueueWithQuery:allMedia];
NSArray *itemsFromGenericQuery = [allMedia items];
NSMutableArray *mArray = [[NSMutableArray alloc] init];
int i = 0;
int j=0;
NSLog(#"itemCount: %d",[itemsFromGenericQuery count]);
float playsQuery = sliderPlays.value;
if(playsQuery == 20){playsQuery = 10000;}
NSLog(#"sliderRating.value %f sliderPlays.value %.1f", [sliderRating value], playsQuery);
while(i++ < 1000){
int trackNumber = arc4random() % [itemsFromGenericQuery count];
MPMediaItem *song = [itemsFromGenericQuery objectAtIndex:trackNumber];
NSString *artistName = [song valueForProperty: MPMediaItemPropertyArtist];
NSString *title = [song valueForProperty: MPMediaItemPropertyTitle];
NSString *rating = [song valueForKey:MPMediaItemPropertyRating];
double lengh = [[song valueForProperty:MPMediaItemPropertyPlaybackDuration] doubleValue];
NSNumber *playCount = [song valueForKey:MPMediaItemPropertyPlayCount];
if ([rating intValue] >= sliderRating.value && [playCount intValue] <= playsQuery) {
if(j++ > 50){break;}
NSLog (#"tracknumber: %d j: %d artistName: %# title: %# lengh: %.1f rating: %# playcount: %d",trackNumber, j, artistName, title, lengh, rating, [playCount intValue]);
[mArray addObject:song];
}
if(i++ > 1000)break;
}
MPMediaItemCollection *itemCol = [[MPMediaItemCollection alloc] initWithItems:mArray];
[myPlayer setQueueWithItemCollection:itemCol];
[myPlayer setShuffleMode: MPMusicShuffleModeSongs];
[myPlayer setRepeatMode: MPMusicRepeatModeNone];
MPMediaItemPropertyRating is a user-defined property, and according to the Apple docs:
User-defined properties cannot be used to build media property predicates.
One way to get around this would be to initially iterate over all the songs, store the ratings in a database (or something else) and sort the data from there.