note
	description: "An AUDIO_SOUND that has been loaded from an MPG file"
	author: "Louis Marchand"
	date: "Wed, 22 Feb 2017 03:42:57 +0000"
	revision: "0.3"

class 
	MPG_SOUND_FILE

create 
	make

feature {NONE} -- Initialization

	make (a_filename: READABLE_STRING_GENERAL)
			-- Initialization for Current using a_filename as filename
		require
			is_mpg_enabled: Mpg_library.is_mpg_enabled
		local
			l_pointer: POINTER
		do
			create {LINKED_LIST [READABLE_STRING_GENERAL]} titles.make
			create {LINKED_LIST [READABLE_STRING_GENERAL]} albums.make
			create {LINKED_LIST [READABLE_STRING_GENERAL]} artists.make
			create {LINKED_LIST [READABLE_STRING_GENERAL]} years.make
			create {LINKED_LIST [READABLE_STRING_GENERAL]} comments.make
			create {LINKED_LIST [READABLE_STRING_GENERAL]} genres.make
			file_ptr := {MPG_EXTERNAL}.mpg123_new (l_pointer, l_pointer)
			default_create
			filename := a_filename
			is_finished := False
		ensure
			handler_valid: not file_ptr.is_default_pointer
		end
	
feature -- Access

	generating_type: TYPE [detachable MPG_SOUND_FILE]
			-- Type of current object
			-- (type of which it is a direct instance)
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			generating_type_not_void: Result /= Void
		end

	generator: STRING_8
			-- Name of current object's generating class
			-- (base class of the type of which it is a direct instance)
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			generator_not_void: Result /= Void
			generator_not_empty: not Result.is_empty
		end

	has_error: BOOLEAN
			-- Is the library has generate an error
			-- (from GAME_ERROR_MANAGER)

	has_ressource_error: BOOLEAN
			-- Has an error occured while opening Current
			-- (from GAME_RESSOURCE)

	is_open: BOOLEAN
			-- Is Current has been properly opened
			-- (from GAME_RESSOURCE)

	last_error: READABLE_STRING_GENERAL
			-- The last error generate by the library
			-- (from GAME_ERROR_MANAGER)
		do
			if attached message as la_message then
				Result := la_message
			else
				Result := ""
			end
		end

	Mpg_library: MPG_LIBRARY_CONTROLLER
			-- Access to the MPG library internal fonctionnality
			-- (from MPG_LIBRARY_SHARED)
		once ("PROCESS")
			create Result
			if attached internal_mpg_library as la_mpg_library then
				Result := la_mpg_library
			else
				create Result
			end
		end
	
feature --Access

	album: detachable READABLE_STRING_GENERAL
			-- The media that Current is from
			-- Void if no 'album' available in Current
		require -- from  METADATA_AUDIO_SOUND
			True
		require else
			is_scanned: is_scanned
		do
			if not albums.is_empty then
				Result := albums.first
			end
		end

	albums: LIST [READABLE_STRING_GENERAL]
			-- The names of the medias that Current is from

	artist: detachable READABLE_STRING_GENERAL
			-- The name of the creator of Current
			-- Void if no 'artist' available in Current
		require -- from  METADATA_AUDIO_SOUND
			True
		require else
			is_scanned: is_scanned
		do
			if not artists.is_empty then
				Result := artists.first
			end
		end

	artists: LIST [READABLE_STRING_GENERAL]
			-- The name of every creators of Current

	bits_per_sample: INTEGER_32
			-- Get the bit resolution of one frame of Current.
		require -- from AUDIO_SOUND
			sound_is_open: is_open
		do
			Result := byte_per_buffer_sample * 8
		end

	channel_count: INTEGER_32
			-- Get the channel number of Current (1=mono, 2=stereo, etc.).
		require -- from AUDIO_SOUND
			sound_is_open: is_open
		do
			Result := channel_count_internal
		end

	close
			-- Stop the management of the stream
		require -- from AUDIO_SOUND
			sound_is_open: is_open
		local
			l_error: INTEGER_32
		do
			l_error := {MPG_EXTERNAL}.mpg123_close (file_ptr)
			is_open := False
		ensure -- from AUDIO_SOUND
			sound_is_closed: not is_open
		end

	comment: detachable READABLE_STRING_GENERAL
			-- Anything that can be add to the definition of Current
			-- Void if no 'comment' available in Current
		require -- from  METADATA_AUDIO_SOUND
			True
		require else
			is_scanned: is_scanned
		do
			if not comments.is_empty then
				Result := comments.first
			end
		end

	comments: LIST [READABLE_STRING_GENERAL]
			-- Everything that can be add to the definition of Current

	frequency: INTEGER_32
			-- Get the frequency (sample rate) of Current.
		require -- from AUDIO_SOUND
			sound_is_open: is_open
		do
			Result := frequency_internal
		end

	genre: detachable READABLE_STRING_GENERAL
			-- The conventional category of Current
			-- Void if no 'genre' available in Current
		require -- from  METADATA_AUDIO_SOUND
			True
		require else
			is_scanned: is_scanned
		do
			if not genres.is_empty then
				Result := genres.first
			end
		end

	genres: LIST [READABLE_STRING_GENERAL]
			-- Every conventional categories of Current

	is_finished: BOOLEAN
			-- Current has finished it's playback
			-- (from AUDIO_SOUND)

	is_openable: BOOLEAN
			-- Can Current be open
		local
			l_file: RAW_FILE
		do
			create l_file.make_with_name (filename)
			Result := l_file.exists and l_file.is_readable
		end

	is_scanned: BOOLEAN
			-- Is scan has been used on Current

	is_seekable: BOOLEAN
			-- Return true if Current support the seek functionnality.
		require -- from AUDIO_SOUND
			sound_is_open: is_open
		do
			Result := True
		end

	is_signed: BOOLEAN
			-- True if the frames in the buffer are signed.
		require -- from AUDIO_SOUND
			sound_is_open: is_open
		do
			Result := resolution_index = {MPG_EXTERNAL}.mpg123_enc_signed_16
		end

	open
			-- Open Current
		require -- from GAME_RESSOURCE
			ressource_is_openable: is_openable
			ressource_is_not_open: not is_open and not has_ressource_error
		do
			open_from_file (filename)
			is_open := not has_error
			has_ressource_error := has_error
		ensure -- from GAME_RESSOURCE
			ressource_is_open: is_open or has_ressource_error
		end

	restart
			-- Restart Current to the beginning.
		require -- from AUDIO_SOUND
			sound_is_open: is_open
		local
			l_error: INTEGER_32
		do
			l_error := {MPG_EXTERNAL}.mpg123_seek (file_ptr, 0, {MPG_EXTERNAL}.seek_set)
			is_finished := False
			if l_error < 0 then
				read_mpg_error ("Cannot restart playback", l_error)
			end
		end

	sample_count: INTEGER_64
			-- The total number of frames in Current
		require -- from AUDIO_SOUND
			sound_is_open: is_open
			is_seekable: is_seekable
		local
			l_error: INTEGER_32
		do
			l_error := {MPG_EXTERNAL}.mpg123_length (file_ptr)
			if l_error < 0 then
				read_mpg_error ("Cannot seek in file", l_error)
				Result := 0
			else
				Result := l_error.to_integer_64
			end
		end

	sample_position: INTEGER_64
			-- The number of frames since the beginning of Current
		require -- from AUDIO_SOUND
			sound_is_open: is_open
			is_seekable: is_seekable
		local
			l_error: INTEGER_32
		do
			l_error := {MPG_EXTERNAL}.mpg123_tell (file_ptr)
			if l_error = {MPG_EXTERNAL}.mpg123_err then
				read_mpg_error ("Cannot get the sample position", l_error)
			end
			Result := l_error + 1.to_integer_64
		end

	sample_seek (a_frame_number: INTEGER_64)
			-- Seek at the frame a_frame_number from the beginning of Current
		require -- from AUDIO_SOUND
			sound_is_open: is_open
			is_seekable: is_seekable
			is_seek_inside: a_frame_number >= 1 and a_frame_number <= sample_count
		local
			l_error: INTEGER_32
		do
			l_error := {MPG_EXTERNAL}.mpg123_seek (file_ptr, (a_frame_number).to_integer_32 - 1, {MPG_EXTERNAL}.seek_set)
			is_finished := False
			if l_error < 0 then
				read_mpg_error ("Cannot seek in file", l_error)
			end
		end

	scan
			-- Full parsing scan of each frame in the file.
			-- Find Metadatas and optimize seek
		require
			open: is_open
			seakable: is_seekable
		local
			l_error: INTEGER_32
		do
			l_error := {MPG_EXTERNAL}.mpg123_scan (file_ptr)
			if l_error /= {MPG_EXTERNAL}.mpg123_ok then
				read_mpg_error ("Cannot scan MPG file", l_error)
			else
				is_scanned := True
				l_error := {MPG_EXTERNAL}.mpg123_meta_check (file_ptr)
				if l_error.bit_and ({MPG_EXTERNAL}.mpg123_id3_constant) /= 0 then
					manage_id3
				end
			end
		end

	time_count: INTEGER_64
			-- The total number of milliseconds in Current
			-- (from AUDIO_SOUND)
		require -- from AUDIO_SOUND
			sound_is_open: is_open
			is_seekable: is_seekable
		do
			Result := (sample_count * 1000) // frequency.to_integer_64
		end

	time_position: INTEGER_64
			-- The number of milliseconds since the beginning of Current
			-- (from AUDIO_SOUND)
		require -- from AUDIO_SOUND
			sound_is_open: is_open
			is_seekable: is_seekable
		do
			Result := ((sample_position - 1) * 1000) // frequency.to_integer_64
		end

	time_seek (a_milliseconds: INTEGER_64)
			-- Seek at a_milliseconds from the beginning of Current
			-- (from AUDIO_SOUND)
		require -- from AUDIO_SOUND
			sound_is_open: is_open
			is_seekable: is_seekable
			is_seek_inside: a_milliseconds >= 1 and a_milliseconds <= time_count
		do
			sample_seek (((a_milliseconds * frequency.to_integer_64) // 1000) + 1)
		end

	title: detachable READABLE_STRING_GENERAL
			-- The readable identifier of Current
			-- Void if no 'title' available in Current
		require -- from  METADATA_AUDIO_SOUND
			True
		require else
			is_scanned: is_scanned
		do
			if not titles.is_empty then
				Result := titles.first
			end
		end

	titles: LIST [READABLE_STRING_GENERAL]
			-- Every readable identifier of Current

	track_number: INTEGER_32
			-- The number of Current in the album
			-- 0 if no 'track_number' available in Current

	year: detachable READABLE_STRING_GENERAL
			-- The creation's date of Current
			-- Void if no 'date' available in Current
		require -- from  METADATA_AUDIO_SOUND
			True
		require else
			is_scanned: is_scanned
		do
			if not years.is_empty then
				Result := years.first
			end
		end

	years: LIST [READABLE_STRING_GENERAL]
			-- The creation's years of Current
	
feature -- Comparison

	frozen deep_equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void
			-- or attached to isomorphic object structures?
			-- (from ANY)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.is_deep_equal (b)
			end
		ensure -- from ANY
			instance_free: class
			shallow_implies_deep: standard_equal (a, b) implies Result
			both_or_none_void: (a = Void) implies (Result = (b = Void))
			same_type: (Result and (a /= Void)) implies (b /= Void and then a.same_type (b))
			symmetric: Result implies deep_equal (b, a)
		end

	frozen equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void or attached
			-- to objects considered equal?
			-- (from ANY)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.is_equal (b)
			end
		ensure -- from ANY
			instance_free: class
			definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.is_equal (b))
		end

	frozen is_deep_equal alias "≡≡≡" (other: MPG_SOUND_FILE): BOOLEAN
			-- Are Current and other attached to isomorphic object structures?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			shallow_implies_deep: standard_is_equal (other) implies Result
			same_type: Result implies same_type (other)
			symmetric: Result implies other.is_deep_equal (Current)
		end

	is_equal (other: MPG_SOUND_FILE): BOOLEAN
			-- Is other attached to an object considered
			-- equal to current object?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			symmetric: Result implies other ~ Current
			consistent: standard_is_equal (other) implies Result
		end

	frozen standard_equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void or attached to
			-- field-by-field identical objects of the same type?
			-- Always uses default object comparison criterion.
			-- (from ANY)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.standard_is_equal (b)
			end
		ensure -- from ANY
			instance_free: class
			definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.standard_is_equal (b))
		end

	frozen standard_is_equal alias "≜" (other: MPG_SOUND_FILE): BOOLEAN
			-- Is other attached to an object of the same type
			-- as current object, and field-by-field identical to it?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			same_type: Result implies same_type (other)
			symmetric: Result implies other.standard_is_equal (Current)
		end
	
feature -- Status report

	conforms_to (other: ANY): BOOLEAN
			-- Does type of current object conform to type
			-- of other (as per Eiffel: The Language, chapter 13)?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		end

	same_type (other: ANY): BOOLEAN
			-- Is type of current object identical to type of other?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			definition: Result = (conforms_to (other) and other.conforms_to (Current))
		end
	
feature {NONE} -- Status report

	is_in_final_collect: BOOLEAN
			-- Is GC currently performing final collection
			-- after execution of current program?
			-- Safe to use in dispose.
			-- (from DISPOSABLE)
		external
			"C inline use %"eif_memory.h%""
		alias
			"return eif_is_in_final_collect;"
		end
	
feature -- Duplication

	frozen clone (other: detachable ANY): like other
		obsolete "Use `twin' instead. [2017-05-31]"
			-- Void if other is void; otherwise new object
			-- equal to other
			--
			-- For non-void other, clone calls copy;
			-- to change copying/cloning semantics, redefine copy.
			-- (from ANY)
		do
			if other /= Void then
				Result := other.twin
			end
		ensure -- from ANY
			instance_free: class
			equal: Result ~ other
		end

	copy (other: MPG_SOUND_FILE)
			-- Update current object using fields of object attached
			-- to other, so as to yield equal objects.
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
			type_identity: same_type (other)
		external
			"built_in"
		ensure -- from ANY
			is_equal: Current ~ other
		end

	frozen deep_clone (other: detachable ANY): like other
		obsolete "Use `deep_twin' instead. [2017-05-31]"
			-- Void if other is void: otherwise, new object structure
			-- recursively duplicated from the one attached to other
			-- (from ANY)
		do
			if other /= Void then
				Result := other.deep_twin
			end
		ensure -- from ANY
			instance_free: class
			deep_equal: deep_equal (other, Result)
		end

	frozen deep_copy (other: MPG_SOUND_FILE)
			-- Effect equivalent to that of:
			--		copy (other . deep_twin)
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		do
			copy (other.deep_twin)
		ensure -- from ANY
			deep_equal: deep_equal (Current, other)
		end

	frozen deep_twin: MPG_SOUND_FILE
			-- New object structure recursively duplicated from Current.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			deep_twin_not_void: Result /= Void
			deep_equal: deep_equal (Current, Result)
		end

	frozen standard_clone (other: detachable ANY): like other
		obsolete "Use `standard_twin' instead. [2017-05-31]"
			-- Void if other is void; otherwise new object
			-- field-by-field identical to other.
			-- Always uses default copying semantics.
			-- (from ANY)
		do
			if other /= Void then
				Result := other.standard_twin
			end
		ensure -- from ANY
			instance_free: class
			equal: standard_equal (Result, other)
		end

	frozen standard_copy (other: MPG_SOUND_FILE)
			-- Copy every field of other onto corresponding field
			-- of current object.
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
			type_identity: same_type (other)
		external
			"built_in"
		ensure -- from ANY
			is_standard_equal: standard_is_equal (other)
		end

	frozen standard_twin: MPG_SOUND_FILE
			-- New object field-by-field identical to other.
			-- Always uses default copying semantics.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			standard_twin_not_void: Result /= Void
			equal: standard_equal (Result, Current)
		end

	frozen twin: MPG_SOUND_FILE
			-- New object equal to Current
			-- twin calls copy; to change copying/twinning semantics, redefine copy.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			twin_not_void: Result /= Void
			is_equal: Result ~ Current
		end
	
feature -- Basic operations

	frozen as_attached: attached MPG_SOUND_FILE
		obsolete "Remove calls to this feature. [2017-05-31]"
			-- Attached version of Current.
			-- (Can be used during transitional period to convert
			-- non-void-safe classes to void-safe ones.)
			-- (from ANY)
		do
			Result := Current
		end

	frozen default: detachable MPG_SOUND_FILE
			-- Default value of object's type
			-- (from ANY)
		do
		end

	frozen default_pointer: POINTER
			-- Default value of type POINTER
			-- (Avoid the need to write p.default for
			-- some p of type POINTER.)
			-- (from ANY)
		do
		ensure -- from ANY
			instance_free: class
		end

	default_rescue
			-- Process exception for routines with no Rescue clause.
			-- (Default: do nothing.)
			-- (from ANY)
		do
		end

	frozen do_nothing
			-- Execute a null action.
			-- (from ANY)
		do
		ensure -- from ANY
			instance_free: class
		end
	
feature {NONE} -- Implementation

	clear_error
			-- Remove error pending in Current
			-- (from GAME_ERROR_MANAGER)
		do
			has_error := False
		ensure -- from GAME_ERROR_MANAGER
			no_error: not has_error
		end

	disable_print_on_error
			-- Desactive the print_on_error functionnality.
			-- (from GAME_ERROR_MANAGER)
		do
			Print_on_error_internal.put (False)
		end

	enable_print_on_error
			-- Active the print_on_error functionnality.
			-- (from GAME_ERROR_MANAGER)
		do
			Print_on_error_internal.put (True)
		end

	get_id3_v1_string (a_pointer: POINTER; a_size: INTEGER_32): READABLE_STRING_GENERAL
			-- Extract the (not necessary null terminated) C string pointed by a_pointer of lenght a_size
		require
			pointer_not_null: not a_pointer.is_default_pointer
		local
			l_managed_pointer: MANAGED_POINTER
			l_c_string: C_STRING
		do
			create l_managed_pointer.make (a_size + 1);
			l_managed_pointer.item.memory_copy (a_pointer, a_size);
			l_managed_pointer.put_natural_8 (0, a_size)
			create l_c_string.make_shared_from_pointer (l_managed_pointer.item)
			Result := l_c_string.string
		end

	id3_v1_genre_string (a_number: INTEGER_32): detachable READABLE_STRING_GENERAL
			-- Map the ID3v1 genre ID a_number to it's text representation
		do
			if a_number = 0 then
				Result := "Blues"
			elseif a_number = 1 then
				Result := "Classic Rock"
			elseif a_number = 2 then
				Result := "Country"
			elseif a_number = 3 then
				Result := "Dance"
			elseif a_number = 4 then
				Result := "Disco"
			elseif a_number = 5 then
				Result := "Funk"
			elseif a_number = 6 then
				Result := "Grunge"
			elseif a_number = 7 then
				Result := "Hip-Hop"
			elseif a_number = 8 then
				Result := "Jazz"
			elseif a_number = 9 then
				Result := "Metal"
			elseif a_number = 10 then
				Result := "New Age"
			elseif a_number = 11 then
				Result := "Oldies"
			elseif a_number = 12 then
				Result := "Other"
			elseif a_number = 13 then
				Result := "Pop"
			elseif a_number = 14 then
				Result := "R&B"
			elseif a_number = 15 then
				Result := "Rap"
			elseif a_number = 16 then
				Result := "Reggae"
			elseif a_number = 17 then
				Result := "Rock"
			elseif a_number = 18 then
				Result := "Techno"
			elseif a_number = 19 then
				Result := "Industrial"
			elseif a_number = 20 then
				Result := "Alternative"
			elseif a_number = 21 then
				Result := "Ska"
			elseif a_number = 22 then
				Result := "Death Metal"
			elseif a_number = 23 then
				Result := "Pranks"
			elseif a_number = 24 then
				Result := "Soundtrack"
			elseif a_number = 25 then
				Result := "Euro-Techno"
			elseif a_number = 26 then
				Result := "Ambient"
			elseif a_number = 27 then
				Result := "Trip-Hop"
			elseif a_number = 28 then
				Result := "Vocal"
			elseif a_number = 29 then
				Result := "Jazz+Funk"
			elseif a_number = 30 then
				Result := "Fusion"
			elseif a_number = 31 then
				Result := "Trance"
			elseif a_number = 32 then
				Result := "Classical"
			elseif a_number = 33 then
				Result := "Instrumental"
			elseif a_number = 34 then
				Result := "Acid"
			elseif a_number = 35 then
				Result := "House"
			elseif a_number = 36 then
				Result := "Game"
			elseif a_number = 37 then
				Result := "Sound Clip"
			elseif a_number = 38 then
				Result := "Gospel"
			elseif a_number = 39 then
				Result := "Noise"
			elseif a_number = 40 then
				Result := "Alternative Rock"
			elseif a_number = 41 then
				Result := "Bass"
			elseif a_number = 42 then
				Result := "Soul"
			elseif a_number = 43 then
				Result := "Punk"
			elseif a_number = 44 then
				Result := "Space"
			elseif a_number = 45 then
				Result := "Meditative"
			elseif a_number = 46 then
				Result := "Instrumental Pop"
			elseif a_number = 47 then
				Result := "Instrumental Rock"
			elseif a_number = 48 then
				Result := "Ethnic"
			elseif a_number = 49 then
				Result := "Gothic"
			elseif a_number = 50 then
				Result := "Darkwave"
			elseif a_number = 51 then
				Result := "Techno-Industrial"
			elseif a_number = 52 then
				Result := "Electronic"
			elseif a_number = 53 then
				Result := "Pop-Folk"
			elseif a_number = 54 then
				Result := "Eurodance"
			elseif a_number = 55 then
				Result := "Dream"
			elseif a_number = 56 then
				Result := "Southern Rock"
			elseif a_number = 57 then
				Result := "Comedy"
			elseif a_number = 58 then
				Result := "Cult"
			elseif a_number = 59 then
				Result := "Gangsta"
			elseif a_number = 60 then
				Result := "Top 40"
			elseif a_number = 61 then
				Result := "Christian Rap"
			elseif a_number = 62 then
				Result := "Pop/Funk"
			elseif a_number = 63 then
				Result := "Jungle"
			elseif a_number = 64 then
				Result := "Native US"
			elseif a_number = 65 then
				Result := "Cabaret"
			elseif a_number = 66 then
				Result := "New Wave"
			elseif a_number = 67 then
				Result := "Psychadelic"
			elseif a_number = 68 then
				Result := "Rave"
			elseif a_number = 69 then
				Result := "Showtunes"
			elseif a_number = 70 then
				Result := "Trailer"
			elseif a_number = 71 then
				Result := "Lo-Fi"
			elseif a_number = 72 then
				Result := "Tribal"
			elseif a_number = 73 then
				Result := "Acid Punk"
			elseif a_number = 74 then
				Result := "Acid Jazz"
			elseif a_number = 75 then
				Result := "Polka"
			elseif a_number = 76 then
				Result := "Retro"
			elseif a_number = 77 then
				Result := "Musical"
			elseif a_number = 78 then
				Result := "Rock & Roll"
			elseif a_number = 79 then
				Result := "Hard Rock"
			elseif a_number = 80 then
				Result := "Folk"
			elseif a_number = 81 then
				Result := "Folk-Rock"
			elseif a_number = 82 then
				Result := "National Folk"
			elseif a_number = 83 then
				Result := "Swing"
			elseif a_number = 84 then
				Result := "Fast Fusion"
			elseif a_number = 85 then
				Result := "Bebob"
			elseif a_number = 86 then
				Result := "Latin"
			elseif a_number = 87 then
				Result := "Revival"
			elseif a_number = 88 then
				Result := "Celtic"
			elseif a_number = 89 then
				Result := "Bluegrass"
			elseif a_number = 90 then
				Result := "Avantgarde"
			elseif a_number = 91 then
				Result := "Gothic Rock"
			elseif a_number = 92 then
				Result := "Progressive Rock"
			elseif a_number = 93 then
				Result := "Psychedelic Rock"
			elseif a_number = 94 then
				Result := "Symphonic Rock"
			elseif a_number = 95 then
				Result := "Slow Rock"
			elseif a_number = 96 then
				Result := "Big Band"
			elseif a_number = 97 then
				Result := "Chorus"
			elseif a_number = 98 then
				Result := "Easy Listening"
			elseif a_number = 99 then
				Result := "Acoustic"
			elseif a_number = 100 then
				Result := "Humour"
			elseif a_number = 101 then
				Result := "Speech"
			elseif a_number = 102 then
				Result := "Chanson"
			elseif a_number = 103 then
				Result := "Opera"
			elseif a_number = 104 then
				Result := "Chamber Music"
			elseif a_number = 105 then
				Result := "Sonata"
			elseif a_number = 106 then
				Result := "Symphony"
			elseif a_number = 107 then
				Result := "Booty Bass"
			elseif a_number = 108 then
				Result := "Primus"
			elseif a_number = 109 then
				Result := "Porn Groove"
			elseif a_number = 110 then
				Result := "Satire"
			elseif a_number = 111 then
				Result := "Slow Jam"
			elseif a_number = 112 then
				Result := "Club"
			elseif a_number = 113 then
				Result := "Tango"
			elseif a_number = 114 then
				Result := "Samba"
			elseif a_number = 115 then
				Result := "Folklore"
			elseif a_number = 116 then
				Result := "Ballad"
			elseif a_number = 117 then
				Result := "Power Ballad"
			elseif a_number = 118 then
				Result := "Rhytmic Soul"
			elseif a_number = 119 then
				Result := "Freestyle"
			elseif a_number = 120 then
				Result := "Duet"
			elseif a_number = 121 then
				Result := "Punk Rock"
			elseif a_number = 122 then
				Result := "Drum Solo"
			elseif a_number = 123 then
				Result := "Acapella"
			elseif a_number = 124 then
				Result := "Euro-House"
			elseif a_number = 125 then
				Result := "Dance Hall"
			elseif a_number = 126 then
				Result := "Goa"
			elseif a_number = 127 then
				Result := "Drum & Bass"
			elseif a_number = 128 then
				Result := "Club-House"
			elseif a_number = 129 then
				Result := "Hardcore"
			elseif a_number = 130 then
				Result := "Terror"
			elseif a_number = 131 then
				Result := "Indie"
			elseif a_number = 132 then
				Result := "BritPop"
			elseif a_number = 133 then
				Result := "Negerpunk"
			elseif a_number = 134 then
				Result := "Polsk Punk"
			elseif a_number = 135 then
				Result := "Beat"
			elseif a_number = 136 then
				Result := "Christian Gangsta"
			elseif a_number = 137 then
				Result := "Heavy Metal"
			elseif a_number = 138 then
				Result := "Black Metal"
			elseif a_number = 139 then
				Result := "Crossover"
			elseif a_number = 140 then
				Result := "Contemporary C"
			elseif a_number = 141 then
				Result := "Christian Rock"
			elseif a_number = 142 then
				Result := "Merengue"
			elseif a_number = 143 then
				Result := "Salsa"
			elseif a_number = 144 then
				Result := "Thrash Metal"
			elseif a_number = 145 then
				Result := "Anime"
			elseif a_number = 146 then
				Result := "JPop"
			elseif a_number = 147 then
				Result := "SynthPop"
			end
		end

	internal_mpg_library: detachable MPG_LIBRARY_CONTROLLER
			-- Assign to this attribute prior to use Mpg_library to inject a specific MPG_LIBRARY_CONTROLLER singleton.
			-- (from MPG_LIBRARY_SHARED)

	manage_id3
			-- Get every ID3 metadatas from Current
		require
			is_open: is_open
			is_scanned: is_scanned
		local
			l_v1, l_v2: POINTER
			l_error: INTEGER_32
		do
			l_error := {MPG_EXTERNAL}.mpg123_id3 (file_ptr, $l_v1.to_pointer, $l_v2.to_pointer)
			if l_error /= {MPG_EXTERNAL}.mpg123_ok then
				read_mpg_error ("Cannot retreive ID3 metadata.", l_error)
			else
				track_number := -1
				if not l_v2.is_default_pointer then
					manage_id3_v2 (l_v2)
				end
				if not l_v1.is_default_pointer then
					manage_id3_v1 (l_v1)
				end
				if track_number = -1 then
					track_number := 0
				end
			end
		end

	manage_id3_v1 (a_pointer: POINTER)
			-- Get every ID3v1 metadatas from Current
		require
			pointer_not_null: not a_pointer.is_default_pointer
		local
			l_pointer: POINTER
		do
			if titles.is_empty then
				l_pointer := {MPG_EXTERNAL}.get_mpg123_id3v1_struct_title (a_pointer)
				if not l_pointer.is_default_pointer then
					titles.extend (get_id3_v1_string (l_pointer, {MPG_EXTERNAL}.sizeof_mpg123_id3v1_title))
				end
			end
			if artists.is_empty then
				l_pointer := {MPG_EXTERNAL}.get_mpg123_id3v1_struct_artist (a_pointer)
				if not l_pointer.is_default_pointer then
					artists.extend (get_id3_v1_string (l_pointer, {MPG_EXTERNAL}.sizeof_mpg123_id3v1_artist))
				end
			end
			if albums.is_empty then
				l_pointer := {MPG_EXTERNAL}.get_mpg123_id3v1_struct_album (a_pointer)
				if not l_pointer.is_default_pointer then
					albums.extend (get_id3_v1_string (l_pointer, {MPG_EXTERNAL}.sizeof_mpg123_id3v1_album))
				end
			end
			if years.is_empty then
				l_pointer := {MPG_EXTERNAL}.get_mpg123_id3v1_struct_year (a_pointer)
				if not l_pointer.is_default_pointer then
					years.extend (get_id3_v1_string (l_pointer, {MPG_EXTERNAL}.sizeof_mpg123_id3v1_year))
				end
			end
			set_comments_from_id3_v1 (a_pointer)
			if genres.is_empty and attached id3_v1_genre_string ({MPG_EXTERNAL}.get_mpg123_id3v1_struct_genre (a_pointer).to_integer_32) as la_genre then
				genres.extend (la_genre)
			end
		end

	manage_id3_v2 (a_pointer: POINTER)
			-- Get every ID3v2 metadatas from Current
		require
			pointer_not_null: not a_pointer.is_default_pointer
		do
			manage_id3_v2_strings ({MPG_EXTERNAL}.get_mpg123_id3v2_struct_title (a_pointer), titles)
			manage_id3_v2_strings ({MPG_EXTERNAL}.get_mpg123_id3v2_struct_artist (a_pointer), artists)
			manage_id3_v2_strings ({MPG_EXTERNAL}.get_mpg123_id3v2_struct_album (a_pointer), albums)
			manage_id3_v2_strings ({MPG_EXTERNAL}.get_mpg123_id3v2_struct_year (a_pointer), years)
			manage_id3_v2_strings ({MPG_EXTERNAL}.get_mpg123_id3v2_struct_genre (a_pointer), genres)
			manage_id3_v2_strings ({MPG_EXTERNAL}.get_mpg123_id3v2_struct_comment (a_pointer), comments)
		end

	manage_id3_v2_string (a_string: STRING_32; a_list: LIST [READABLE_STRING_GENERAL])
			-- Put every individual lines of a_string in a_list
		local
			l_n_split, l_r_split: LIST [STRING_32]
		do
			l_n_split := a_string.split ({CHARACTER_32}'%N')
			across
				l_n_split as la_n_split
			loop
				l_r_split := la_n_split.item.split ({CHARACTER_32}'%R')
				across
					l_r_split as la_r_split
				loop
					if not la_r_split.item.is_empty then
						a_list.extend (la_r_split.item)
					end
				end
			end
		end

	manage_id3_v2_strings (a_pointer: POINTER; a_list: LIST [READABLE_STRING_GENERAL])
			-- Extract every C string pointed by a_pointer and put then in a_list
		local
			l_string_start: BOOLEAN
			l_managed_pointer: MANAGED_POINTER
			l_count, l_index: INTEGER_32
			l_utf_converter: UTF_CONVERTER
		do
			if not a_pointer.is_default_pointer then
				create l_utf_converter
				create l_managed_pointer.share_from_pointer ({MPG_EXTERNAL}.get_mpg123_string_struct_p (a_pointer), {MPG_EXTERNAL}.get_mpg123_string_struct_fill (a_pointer))
				from
					l_index := 0
					l_string_start := False
				until
					l_index >= l_managed_pointer.count
				loop
					if not l_string_start and l_managed_pointer.read_natural_8 (l_index) /= 0 then
						manage_id3_v2_string (l_utf_converter.utf_8_0_subpointer_to_escaped_string_32 (l_managed_pointer, l_index, l_managed_pointer.count - 1, True), a_list)
						l_string_start := True
					end
					if l_managed_pointer.read_natural_8 (l_index) = 0 then
						l_string_start := False
					end
					l_index := l_index + 1
				end
			end
		end

	message: detachable READABLE_STRING_GENERAL
			-- The specific message for the last error
			-- (from GAME_ERROR_MANAGER)

	open_from_file (a_filename: READABLE_STRING_GENERAL)
			-- open Current using a_filename
		local
			l_filename_c: C_STRING
			l_error: INTEGER_32
			l_converter: UTF_CONVERTER
		do
			create l_converter
			create l_filename_c.make (l_converter.string_32_to_utf_8_string_8 (filename.to_string_32))
			l_error := {MPG_EXTERNAL}.mpg123_open (file_ptr, l_filename_c.item)
			if l_error /= {MPG_EXTERNAL}.mpg123_ok then
				read_mpg_error ({STRING_32}"Cannot open file " + a_filename.as_string_32, l_error)
			else
				l_error := {MPG_EXTERNAL}.mpg123_getformat (file_ptr, $frequency_internal.to_pointer, $channel_count_internal.to_pointer, $resolution_index.to_pointer)
				if l_error /= {MPG_EXTERNAL}.mpg123_ok then
					read_mpg_error ({STRING_32}"Cannot get audio format from " + a_filename.as_string_32, l_error)
				else
					l_error := {MPG_EXTERNAL}.mpg123_format_none (file_ptr)
					if l_error /= {MPG_EXTERNAL}.mpg123_ok then
						read_mpg_error ({STRING_32}"Cannot get audio format from " + a_filename.as_string_32, l_error)
					else
						l_error := {MPG_EXTERNAL}.mpg123_format (file_ptr, frequency_internal, channel_count_internal, resolution_index)
						read_mpg_error ({STRING_32}"Cannot get audio format from " + a_filename.as_string_32, l_error)
					end
				end
			end
		end

	print_on_error: BOOLEAN
			-- When an error occured, the library will print
			-- informations about the error on the error console
			-- output (default is True).
			-- (from GAME_ERROR_MANAGER)
		do
			Result := Print_on_error_internal.item
		end

	Print_on_error_internal: CELL [BOOLEAN]
			-- True when an error occured,
			-- The library will print it right away.
			-- (from GAME_ERROR_MANAGER)
		once ("PROCESS")
			create Result.put (True)
		end

	put_error (a_general_message, a_specific_error: READABLE_STRING_GENERAL)
			-- Create an error using a_general_error for the debug information
			-- and a_specific_error for the lasting information
			-- (from GAME_ERROR_MANAGER)
		local
			l_converter: UTF_CONVERTER
		do
			message := a_specific_error
			has_error := True
			if Print_on_error_internal.item then
				if a_general_message.is_valid_as_string_8 then
					Io.Error.put_string (a_general_message.to_string_8 + "%N")
				else
					create l_converter;
					Io.Error.put_string (l_converter.string_32_to_utf_8_string_8 (a_general_message.to_string_32) + "%N")
				end
				if a_specific_error.is_valid_as_string_8 then
					Io.Error.put_string (a_specific_error.to_string_8 + "%N")
				else
					create l_converter;
					Io.Error.put_string (l_converter.string_32_to_utf_8_string_8 (a_specific_error.to_string_32) + "%N")
				end
			end
		ensure -- from GAME_ERROR_MANAGER
				has_error
		end

	read_mpg_error (a_message: READABLE_STRING_GENERAL; a_code: INTEGER_32)
			-- Read an error message from the internal library using the error code a_code
			-- and using a general error message a_message
		do
			Precursor (a_message, a_code)
			has_ressource_error := has_error
		end

	set_comments_from_id3_v1 (a_pointer: POINTER)
			-- Extract the ID3v1 comment (including track_number) from Current
		require
			pointer_not_null: not a_pointer.is_default_pointer
		local
			l_pointer: POINTER
			l_managed_pointer: MANAGED_POINTER
			l_count: INTEGER_32
		do
			l_count := {MPG_EXTERNAL}.sizeof_mpg123_id3v1_comment
			l_pointer := {MPG_EXTERNAL}.get_mpg123_id3v1_struct_comment (a_pointer)
			if not l_pointer.is_default_pointer then
				create l_managed_pointer.share_from_pointer (l_pointer, l_count)
				if l_managed_pointer.read_natural_8 (l_count - 2) = 0 then
					if track_number = -1 then
						track_number := l_managed_pointer.read_natural_8 (l_count - 1).to_integer_32
					end
					l_count := l_count - 2
				end
				if comments.is_empty then
					comments.extend (get_id3_v1_string (l_managed_pointer.item, l_count))
				end
			end
		end

	set_print_on_error (a_value: BOOLEAN)
			-- Assign to print_on_error the value of a_value
			-- (from GAME_ERROR_MANAGER)
		do
			if a_value then
				enable_print_on_error
			else
				disable_print_on_error
			end
		ensure -- from GAME_ERROR_MANAGER
			is_assign: print_on_error ~ a_value
		end
	
feature -- Implementation

	dispose
			-- Action to be executed just before garbage collection
			-- reclaims an object.
			-- Effect it in descendants to perform specific dispose
			-- actions. Those actions should only take care of freeing
			-- external resources; they should not perform remote calls
			-- on other objects since these may also be dead and reclaimed.
		local
			error: INTEGER_32
		do
			if is_open then
				close
			end
			{MPG_EXTERNAL}.mpg123_delete (file_ptr)
		end
	
feature {AUDIO_SOURCE}{AUDIO_SOURCE} 

	byte_per_buffer_sample: INTEGER_32
			-- The number of byte for one frame of Current.
		require -- from AUDIO_SOUND
			sound_is_open: is_open
		do
			if resolution_index = {MPG_EXTERNAL}.mpg123_enc_ulaw_8 then
				Result := 1
			elseif resolution_index = {MPG_EXTERNAL}.mpg123_enc_signed_16 then
				Result := 2
			end
		end

	fill_buffer (a_buffer: POINTER; a_max_length: INTEGER_32)
			-- Fill the next data samples in a_buffer (no more than a_max_length byte)
			-- The actual number of byte placed in a_buffer will be available in last_buffer_size
			-- Warning: side effect on a_buffer
		require -- from AUDIO_SOUND
			sound_is_open: is_open
		local
			l_size, l_error: INTEGER_32
		do
			l_error := {MPG_EXTERNAL}.mpg123_read (file_ptr, a_buffer, a_max_length, $l_size.to_pointer)
			read_mpg_error ("Cannot read stream", l_error)
			last_buffer_size := l_size
			if last_buffer_size = 0 then
				is_finished := True
			end
		end
	
feature {AUDIO_SOURCE} 

	last_buffer_size: INTEGER_32
			-- The size of the last buffer filled by fill_buffer
			-- (from AUDIO_SOUND)
	
feature {NONE} -- Implementation - Variables

	channel_count_internal: INTEGER_32
			-- The value of the channel_count attributes

	file_ptr: POINTER
			-- C pointer to the sound file handle

	filename: READABLE_STRING_GENERAL
			-- The name of the file containing the audio data

	frequency_internal: INTEGER_32
			-- The value of the frequency attributes

	resolution_index: INTEGER_32
			-- Index to differenciate between signed 16 bits samples and unsigned 8 bits samples.
	
feature {NONE} -- Initialisation

	default_create
			-- Initialization of Current
			-- (from GAME_RESSOURCE)
		require -- from  ANY
			True
		do
			is_open := False
			has_ressource_error := False
		end
	
feature -- Output

	Io: STD_FILES
			-- Handle to standard file setup
			-- (from ANY)
		once
			create Result;
			Result.set_output_default
		ensure -- from ANY
			instance_free: class
			io_not_void: Result /= Void
		end

	out: STRING_8
			-- New string containing terse printable representation
			-- of current object
			-- (from ANY)
		do
			Result := tagged_out
		ensure -- from ANY
			out_not_void: Result /= Void
		end

	print (o: detachable ANY)
			-- Write terse external representation of o
			-- on standard output.
			-- (from ANY)
		local
			s: READABLE_STRING_8
		do
			if attached o then
				s := o.out
				if attached {READABLE_STRING_32} s as s32 then
					Io.put_string_32 (s32)
				elseif attached {READABLE_STRING_8} s as s8 then
					Io.put_string (s8)
				else
					Io.put_string_32 (s.as_string_32)
				end
			end
		ensure -- from ANY
			instance_free: class
		end

	frozen tagged_out: STRING_8
			-- New string containing terse printable representation
			-- of current object
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			tagged_out_not_void: Result /= Void
		end
	
feature -- Platform

	Operating_environment: OPERATING_ENVIRONMENT
			-- Objects available from the operating system
			-- (from ANY)
		once
			create Result
		ensure -- from ANY
			instance_free: class
			operating_environment_not_void: Result /= Void
		end
	
feature {NONE} -- Retrieval

	frozen internal_correct_mismatch
			-- Called from runtime to perform a proper dynamic dispatch on correct_mismatch
			-- from MISMATCH_CORRECTOR.
			-- (from ANY)
		local
			l_msg: STRING_32
			l_exc: EXCEPTIONS
		do
			if attached {MISMATCH_CORRECTOR} Current as l_corrector then
				l_corrector.correct_mismatch
			else
				create l_msg.make_from_string ("Mismatch: ".as_string_32)
				create l_exc;
				l_msg.append (generating_type.name_32);
				l_exc.raise_retrieval_exception (l_msg)
			end
		end
	
invariant
		-- from AUDIO_SOUND
	errors_valid: has_error ~ has_ressource_error

		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

end -- class MPG_SOUND_FILE

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