mpeg - interface to the mpeg device driver
include "draw.m"; import Display, Image, Rect: Draw;
mpeg:= load Mpeg Mpeg->PATH;
PATH: con "/dis/lib/mpeg.dis";
play: fn(d: ref Display,
w: ref Image,
notify: chan of string) : string;
ctl: fn(msg: string) : int;
keycolor: fn(d: ref Display) : ref Image;
This module has a primitive interface to the mpeg device driver.
play (d, w, dopaint, r, file, notify)
The play function plays the specified MPEG file (file) in rectangle r within window w on display d. The dopaint flag specifies whether, before playing the movie, to paint the rectangle with the chroma key color of the device.
The notify argument is a channel upon which to receive errors and status. If notify is nil, play runs synchronously, returning the empty string ("") when the movie completes or a description of any error. If notify is not nil, play spawns an asynchronous process to play the movie and returns the empty string immediately; the process will return status on the notify channel when the movie completes.
The ctl function writes msg, the string given as an argument, to the MPEG control interface /dev/mpegctl.
This function uses the Display specified by d to create an Image an single-pixel, replicated off screen Image of color Chroma (16r05).
Copyright © 1996,Lucent Technologies, Inc. All rights