TDAudioPlayer is a library for playing streams from HTTP or NSInputStream sources. It's initial motivation came from the need to stream audio over NSInputStreams in a MultiPeer Connectivity application and evolved to support HTTP streams as well.

Installation

To install with CocoaPods, add this to your Podfile

pod 'TDAudioPlayer'

and then run this in your shell:

pod install

Supported Versions

TDAudioPlayer is written and tested in XCode 5 using iOS 7; however, I believe it would work in iOS 6 just fine. I will change the podspec once it has been tested in iOS 6.

How To Use

Quick Play

To play audio from a HTTP or NSInputStream source, use the TDAudioPlayer singleton class to load the source into the player and then play the audio.

NSURL *url = [NSURL urlFromString:@"http://web.url/to/my/audio/file"];
[[TDAudioPlayer sharedAudioPlayer] loadAudioFromURL:url];
[[TDAudioPlayer sharedAudioPlayer] play];

or

NSInputStream *stream = [self myMethodThatGetsAnInputStream];
[[TDAudioPlayer sharedAudioPlayer] loadAudioFromStream:stream];
[[TDAudioPlayer sharedAudioPlayer] play];

When using the audio player singleton [TDAudioPlayer sharedAudioPlayer] the Audio Session will be properly configured to keep your audio playing when the app is backgrounded or the device is locked. It can also send the currently playing song info to the Now Playing Media Info on your device which will allow you to see what's playing on your lock screen.

Set Now Playing Media Info

To view the info of the currently playing audio, create an instance of the TDAudioMetaInfo class and set as many of the properties as you can:

• title The title of the track, song, or audio piece
• artist The name of the composing artist
• albumArtSmall A URL string to the low res album art image
• albumArtLarge A URL string to the high res album art image
• duration The number of seconds of audio in the stream

Then pass this meta info along with the source to the [TDAudioPlayer sharedAudioPlayer] load method.

TDAudioMetaInfo *meta = [[TDAudioMetaInfo alloc] init];
meta.title = @"Title of the Track";
meta.artist = @"Artist Name";
meta.albumArtSmall = @"http://www.some-address.com/track_id/low_res_image.png";
meta.albumArtLarge = @"http://www.some-address.com/track_id/high_res_image.png";
meta.duration = @356;

then

NSURL *url = [NSURL urlFromString:@"http://web.url/to/my/audio/file"];
[[TDAudioPlayer sharedAudioPlayer] loadAudioFromURL:url withMetaData:meta];
[[TDAudioPlayer sharedAudioPlayer] play];

or

NSInputStream *stream = [self myMethodThatGetsAnInputStream];
[[TDAudioPlayer sharedAudioPlayer] loadAudioFromStream:stream withMetaData:meta];
[[TDAudioPlayer sharedAudioPlayer] play];

Use the following methods to control the audio player.

[[TDAudioPlayer sharedAudioPlayer] play];
[[TDAudioPlayer sharedAudioPlayer] pause];
[[TDAudioPlayer sharedAudioPlayer] stop];

Lower level

You can use the lower level class, TDAudioInputStreamer, to play audio without using the Audio Session or Now Playing Media Info features.

NSURL *url = [NSURL urlFromString:@"http://web.url/to/my/audio/file"];
TDAudioInputStreamer *streamer = [[TDAudioInputStreamer alloc] initWithURL:url];

To start playing audio, call start. Then use the following methods to control the audio flow.

[streamer start];
[streamer pause];
[streamer resume];
[streamer stop];

Notifications

When using the TDAudioPlayer singleton class, it will post notifications at certain points of audio playback.

• TDAudioPlayerDidChangeAudioNotification Posts when a new audio stream is loaded into the player.
• TDAudioPlayerDidPauseNotification Posts when the audio player pause action is executed.
• TDAudioPlayerDidPlayNotification Posts when the audio player play action is executed.
• TDAudioPlayerDidStopNotification Posts when the audio player stop action is executed.
• TDAudioStreamDidStartPlayingNotification Posts when the audio starts playing.
• TDAudioStreamDidFinishPlayingNotification Posts when the audio has finished playing.

If you are using the lower level class TDAudioInputStreamer, only the last 2 notifications will ever be posted. (TDAudioStreamDidStartPlayingNotification and TDAudioStreamDidFinishPlayingNotification)

There are two more notifications that are useful for implementing a playlist in you application. These notifications become available if you implement the Lock Screen and Remote Audio Controls in the next section.

• TDAudioPlayerNextTrackRequestNotification Posts when the user touches next on the lock screen or remote device.
• TDAudioPlayerPreviousTrackRequestNotification Posts when the user touches previous on the lock screen or remote device.

Listen for these notifications in your playlist class and load the next or previous audio stream into the TDAudioPlayer.

Lock Screen and Remote Audio Controls

To receive audio control events from the lock screen or from a remote device, you have to turn on the event listening and then pass the events to the TDAudioPlayer singleton event handler. You can see an example of this in the demo's App Delegate.

Add this method call to your App Delegate's application:didFinishLaunchingWithOptions: method to start receiving remote control events.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // your custom startup code

    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    return YES;
}

Then add the converse method call to your App Delegate's applicationWillTerminate: method to stop receiving events.

- (void)applicationWillTerminate:(UIApplication *)application
{
    [[UIApplication sharedApplication] endReceivingRemoteControlEvents];
}

Finally, capture the remote control events and pass them along to [TDAudioPlayer sharedAudioPlayer] or write your own logic.

- (void)remoteControlReceivedWithEvent:(UIEvent *)event
{
    [[TDAudioPlayer sharedAudioPlayer] handleRemoteControlEvent:event];
}

Demos

There are a few demos you can look at to get started. There is an example on how to quickly play a single file and use the lower level class in the TDSingleStreamViewController. Look at TDMultiStreamViewController and its associated classes for an example of implementing a playlist.

This library is used in Console.fm. Check out this project for another great example.

Credits

This library was written by Anthony(Tony) DiPasquale while referencing Apple's provided sample code and Matt Gallagher's AudioStreamer project.

License

TDAudioPlayer is Copyright (c) 2013 Anthony DiPasquale. It is free software, and may be redistributed under the terms specified in the LICENSE file.