ref: f5cc6fbe3a7bcf8bdb002c646ddd519014afafd2
dir: /module/riff.m/
#
# Microsoft Resource Interchange File Format
# with AVI support
#
Riff: module
{
PATH: con "/dis/lib/riff.dis";
DEFBUF: con 8192;
BI_RGB: con 0;
BI_RLE8: con 1;
BI_RLE4: con 2;
BI_BITFEILD: con 3;
RGB: adt
{
r: int;
g: int;
b: int;
};
Binfosize: con 10*4;
Bitmapinfo: adt # Windows bitmap info structure
{
width: int; # width in pixels
height: int; # height in pixels
planes: int; # planes of output device (must be 1)
bitcount: int; # bits per pixel
compression: int; # coding BI_RGB... or IV32 for indeo
sizeimage: int; # size in bytes of image
xpelpermeter: int; # resolution in pixels per meter
ypelpermeter: int;
clrused: int; # colors used
clrimportant: int; # how fixed is the map
cmap: array of RGB; # color map
};
AVImainhdr: con 14*4;
AVIhdr: adt
{
usecperframe: int;
bytesec: int;
flag: int;
frames: int;
initframes: int;
streams: int;
bufsize: int;
width: int;
height: int;
};
AVIstreamhdr: con 2*4 + 10*4;
AVIstream: adt
{
# Stream Header information
stype: string;
handler: string;
flags: int;
priority: int;
initframes: int;
scale: int;
rate: int;
start: int;
length: int;
bufsize: int;
quality: int;
samplesz: int;
# Stream Format information (decoder specific)
fmt: array of byte;
binfo: ref Bitmapinfo;
fmt2binfo: fn(a: self ref AVIstream): string;
};
# Riff descriptor
RD: adt
{
fd: ref sys->FD; # descriptor of RIFF file
buf: array of byte; # buffer
nbyte: int; # bytes remaining
ptr: int; # buffer pointer
gethdr: fn(r: self ref RD): (string, int);
readn: fn(r: self ref RD, b: array of byte, l: int): int;
check4: fn(r: self ref RD, code: string): string;
avihdr: fn(r: self ref RD): (ref AVIhdr, string);
streaminfo: fn(r: self ref RD): (ref AVIstream, string);
skip: fn(r: self ref RD, size: int): int;
};
init: fn();
open: fn(file: string): (ref RD, string);
};