iOS implementation of app::audio using AVAudioPlayer

Redefined classes

redef abstract class PlayableAudio

ios :: audio $ PlayableAudio

Abstraction of a playable Audio

All class definitions

redef abstract class PlayableAudio

ios :: audio $ PlayableAudio

Abstraction of a playable Audio
package_diagram ios::audio audio app::audio audio ios::audio->app::audio ios::assets assets ios::audio->ios::assets app::app_base app_base app::audio->app::app_base cocoa cocoa ios::assets->cocoa app::assets assets ios::assets->app::assets ...>app::app_base ...cocoa ... ...cocoa->cocoa ...>app::assets a_star-m a_star-m a_star-m->ios::audio


module abstract_collection

core :: abstract_collection

Abstract collection classes and services.
module abstract_text

core :: abstract_text

Abstract class for manipulation of sequences of characters
module app_base

app :: app_base

Base of the app.nit framework, defines App
module app_kit

cocoa :: app_kit

The Application Kit provides services to create GUI
module array

core :: array

This module introduces the standard array structure.
module assets

app :: assets

Portable services to load resources from the assets folder
module bitset

core :: bitset

Services to handle BitSet
module bytes

core :: bytes

Services for byte streams and arrays
module circular_array

core :: circular_array

Efficient data structure to access both end of the sequence.
module cocoa

cocoa :: cocoa

Cocoa API, the development layer of OS X
module codec_base

core :: codec_base

Base for codecs to use with streams
module codecs

core :: codecs

Group module for all codec-related manipulations
module collection

core :: collection

This module define several collection classes.
module core

core :: core

Standard classes and methods used by default by Nit programs and libraries.
module environ

core :: environ

Access to the environment variables of the process
module error

core :: error

Standard error-management infrastructure.
module exec

core :: exec

Invocation and management of operating system sub-processes.
module file

core :: file

File manipulations (create, read, write, etc.)
module fixed_ints

core :: fixed_ints

Basic integers of fixed-precision
module fixed_ints_text

core :: fixed_ints_text

Text services to complement fixed_ints
module flat

core :: flat

All the array-based text representations
module foundation

cocoa :: foundation

The Foundation Kit provides basic Objective-C classes and structures
module gc

core :: gc

Access to the Nit internal garbage collection mechanism
module hash_collection

core :: hash_collection

Introduce HashMap and HashSet.
module iso8859_1

core :: iso8859_1

Codec for ISO8859-1 I/O
module kernel

core :: kernel

Most basic classes and methods.
module list

core :: list

This module handle double linked lists
module math

core :: math

Mathematical operations
module native

core :: native

Native structures for text and bytes
module numeric

core :: numeric

Advanced services for Numeric types
module protocol

core :: protocol

module queue

core :: queue

Queuing data structures and wrappers
module range

core :: range

Module for range of discrete objects.
module re

core :: re

Regular expression support for all services based on Pattern
module ropes

core :: ropes

Tree-based representation of a String.
module sorter

core :: sorter

This module contains classes used to compare things and sorts arrays.
module stream

core :: stream

Input and output streams of characters
module text

core :: text

All the classes and methods related to the manipulation of text entities
module time

core :: time

Management of time and dates
module union_find

core :: union_find

union–find algorithm using an efficient disjoint-set data structure
module utf8

core :: utf8

Codec for UTF-8 I/O


module assets

ios :: assets

Implementation of app::assets
module audio

app :: audio

Services to load and play Sound and Music from the assets folder


module a_star-m


# iOS implementation of `app::audio` using `AVAudioPlayer`
module audio

import app::audio
intrude import ios::assets

in "ObjC Header" `{
	#import <AVFoundation/AVFoundation.h>

redef class PlayableAudio

	redef var error = null

	private var native: nullable AVAudioPlayer is lazy do

		# Find file
		var ns_path = ("assets"/path).to_nsstring
		var url_in_bundle = asset_url(ns_path)
		if url_in_bundle.address_is_null then
			self.error = new Error("Sound at '{path}' not found")
			return null

		var player = new AVAudioPlayer.contents_of(url_in_bundle)
		# TODO set delegate to get further errors
		if player.address_is_null then
			self.error = new Error("Sound at '{path}' failed to load")
			return null


		return player

	redef fun load do native # For lazy loading

	redef fun play
		var native = native
		if native != null then native.play_and_repare_async

	# Free native resources
	fun destroy
		var native = native
		if native != null then native.release

# Audio player playing audio from a file or from memory
private extern class AVAudioPlayer in "ObjC" `{ AVAudioPlayer *`}
	super NSObject

	new contents_of(url: NSObject) in "ObjC" `{
		NSError *error;
		AVAudioPlayer *a = [[AVAudioPlayer alloc] initWithContentsOfURL:(NSURL*)url error:&error];
		if (error != nil) {
			NSLog(@"Failed to load sound: %@", [error localizedDescription]);
			return NULL;

		return (__bridge AVAudioPlayer*)CFBridgingRetain(a);

	fun play in "ObjC" `{ [self play]; `}

	fun prepare_to_play in "ObjC" `{ [self prepareToPlay]; `}

	fun play_and_repare_async in "ObjC" `{
		dispatch_queue_t q = dispatch_get_global_queue(QOS_CLASS_USER_INTERACTIVE, 0);
		dispatch_async(q, ^{
			[self play];
			[self prepareToPlay];

	fun release in "ObjC" `{ CFBridgingRelease((__bridge void*)self); `}