Music.PlayFileLoopPart of Music module

Syntax   Music.PlayFileLoop ( fileName : string )

Description   The Music.PlayFileLoop procedure is used to play a file of music continuously, looping until the program is halted or the Music.PlayFileStop command is given. The file must be in one of the acceptable formats and the machine, must have the appropriate hardware.

The fileNameparameter must give the format of the file:

 WAV files "WAV:filename" or "filename.WAV"
 MP3 files "MP3:filename" or "filename.MP3"
 MIDI files "MIDI:filename" or "filename.MIDI"

The Music.PlayFileLoop procedure is used to provide continuous background music for a program. When called, the music starts playing, and the procedure returns immediately.

Details   Unlike Music.PlayFile, the Music.PlayFileLoop procedure does not have to be called in a separate process. However, the music will not stop playing (nor will a program that calls this procedure terminate) until Music.PlayFileStop is called.

Example   This program continuously plays the music in the file "branden3.wav" while drawing ovals on the screen.

        Music.PlayFileLoop ("branden3.wav")
        var x, y, clr : int
            x := Rand.Int (0, maxx)
            y := Rand.Int (0, maxy)
            clr := Rand.Int (0, maxcolor)
            Draw.FillOval (x, y, 30, 30, clr)
            exit when hasch
        end loop

Details   To play a sound file requires that the computer be equipped with a sound card and speakers.

Details   The Turing 4.1 software can play files in the following audio formats: WAVE (.wav) files, MIDI files (.midi or .mid), and MP3 files (.mp3). In general, MIDI files are the most efficient and thus are the preferred form for longer music pieces like background music. WAVE files can record anything, not just music, so are often used for sound effects.

Details   The Turing 4.1 software can also play music on a compact disk. Toplay the complete contents of the compact disk, the filename is “cd”. To play a single track from a compact disk, the filename is “cd:[track number]”.

        Music.PlayFileLoop ("cd")       % Play the entire CD
        Music.PlayFileLoop ("cd:3")     % Play the third track on the CD
Details   On the PC, different formats of music can play simultaneously. This means that a program might use a MIDI file as a background soundtrack and then use WAVE files for individual sound effects. The sound effects would not interfere with the background music. Playing a second music file with the same format as an already playing piece immediately halts the first piece and starts the second. This can be used to stop a single type of music by playing a short silent piece of music.

Example   This program bounces a maple leaf around the screen with background music and a sound effect when the maple leaf hits an edge. When the user presses any key, the program immediately exits.

        const STAR_SIZE : int := 80
        var pic, x, y, dx, dy : int
        % Get the original picture
        Draw.FillStar (3, 3, STAR_SIZE - 3, STAR_SIZE - 3, brightred)
        pic := Pic.New (0, 0, STAR_SIZE, STAR_SIZE)
        % Set the initial location and direction of movement
        x := Rand.Int (0, maxx - STAR_SIZE)
        y := Rand.Int (0, maxy - STAR_SIZE)
        dx := 1
        dy := 1
        Music.PlayFileLoop ("background.mid") % Start background music playing
            if x + dx < 0 or x + dx > maxx - STAR_SIZE then
                dx := -dx
                Music.PlayFileReturn ("boing.wav")
            end if
            if y + dy < 0 or y + dy > maxy - STAR_SIZE then
                dy := -dy
                Music.PlayFileReturn ("boing.wav")
            end if
            x += dx
            y += dy
            Pic.Draw (pic, x, y, picCopy)
            exit when hasch
            Time.Delay (5)
        end loop
        % Stop the background music.

See also   Music.PlayFileStop to halt a music file that is current playing.

Status   Exported qualified.

This means that you can only call the function by calling Music.PlayFileLoop, not by calling PlayFileLoop.