mpeg - interface to the mpeg device driver

include "draw.m"; 
import Display, Image, Rect: Draw;
include "mpeg.m";
mpeg:= load Mpeg Mpeg->PATH;

Mpeg: module
{
  PATH:   con "/dis/lib/mpeg.dis";
  play:     fn(d:       ref Display,
               w:       ref Image,
               dopaint: int,
               r:       Rect,
               file:    string,
               notify:  chan of string)   : string;
  ctl:      fn(msg: string)               : int;
  keycolor: fn(d: ref Display)            : ref Image;
};

Description

This module has a primitive interface to the mpeg device driver.

play

play:     fn(d:       ref Display,
             w:       ref Image,
             dopaint: int,
             r:       Rect,
             file:    string,
             notify:  chan of string): string;

## returns empty string or error message.

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 returns the status on the notify channel when the movie completes.

ctl

ctl: fn(msg: string): int;

## returns length of msg written to mpegctl; -1 on error.

The ctl function writes msg, the string given as an argument, to the MPEG control interface /dev/mpegctl.

keycolor

keycolor: fn(d: ref Display): ref Image;

This function uses the Display specified by d to create a single-pixel, replicated off screen Image of color Chroma (16r05).

Files

/dev/mpeg

/dev/mpegctl

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