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implement Wav2Iaf;
include "sys.m";
include "draw.m";
include "bufio.m";
sys: Sys;
FD: import sys;
bufio: Bufio;
Iobuf: import bufio;
stderr: ref FD;
inf: ref Iobuf;
prog: string;
buff4: array of byte;
pad := array[] of { " ", " ", "", " " };
Wav2Iaf: module
{
init: fn(ctxt: ref Draw->Context, argv: list of string);
};
ioerror()
{
sys->fprint(stderr, "%s: read error: %r\n", prog);
exit;
}
shortfile(diag: string)
{
sys->fprint(stderr, "%s: short read: %s\n", prog, diag);
exit;
}
error(s: string)
{
sys->fprint(stderr, "%s: bad wave file: %s\n", prog, s);
exit;
}
get(c: int, s: string)
{
n := inf.read(buff4, c);
if (n < 0)
ioerror();
if (n != c)
shortfile("expected " + s);
}
gets(c: int, s: string) : string
{
get(c, s);
return string buff4[0:c];
}
need(s: string)
{
get(4, s);
if (string buff4 != s) {
sys->fprint(stderr, "%s: not a wave file\n", prog);
exit;
}
}
getl(s: string) : int
{
get(4, s);
return int buff4[0] + (int buff4[1] << 8) + (int buff4[2] << 16) + (int buff4[3] << 24);
}
getw(s: string) : int
{
get(2, s);
return int buff4[0] + (int buff4[1] << 8);
}
skip(n: int)
{
while (n > 0) {
inf.getc();
n--;
}
}
bufcp(s, d: ref Iobuf, n: int)
{
while (n > 0) {
b := s.getb();
if (b < 0) {
if (b == Bufio->EOF)
sys->fprint(stderr, "%s: short input file\n", prog);
else
sys->fprint(stderr, "%s: read error: %r\n", prog);
exit;
}
d.putb(byte b);
n--;
}
}
init(nil: ref Draw->Context, argv: list of string)
{
l: int;
a: string;
sys = load Sys Sys->PATH;
stderr = sys->fildes(2);
prog = hd argv;
argv = tl argv;
bufio = load Bufio Bufio->PATH;
if (bufio == nil)
sys->fprint(stderr, "%s: could not load %s: %r\n", prog, Bufio->PATH);
if (argv == nil) {
inf = bufio->fopen(sys->fildes(0), Bufio->OREAD);
if (inf == nil) {
sys->fprint(stderr, "%s: could not fopen stdin: %r\n", prog);
exit;
}
}
else if (tl argv != nil) {
sys->fprint(stderr, "usage: %s [infile]\n", prog);
exit;
}
else {
inf = bufio->open(hd argv, Sys->OREAD);
if (inf == nil) {
sys->fprint(stderr, "%s: could not open %s: %r\n", prog, hd argv);
exit;
}
}
buff4 = array[4] of byte;
need("RIFF");
getl("length");
need("WAVE");
for (;;) {
a = gets(4, "tag");
l = getl("length");
if (a == "fmt ")
break;
skip(l);
}
if (getw("format") != 1)
error("not PCM");
chans := getw("channels");
rate := getl("rate");
getl("AvgBytesPerSec");
getw("BlockAlign");
bits := getw("bits");
l -= 16;
do {
skip(l);
a = gets(4, "tag");
l = getl("length");
}
while (a != "data");
outf := bufio->fopen(sys->fildes(1), Sys->OWRITE);
if (outf == nil) {
sys->fprint(stderr, "%s: could not fopen stdout: %r\n", prog);
exit;
}
s := "rate\t" + string rate + "\n"
+ "chans\t" + string chans + "\n"
+ "bits\t" + string bits + "\n"
+ "enc\tpcm";
outf.puts(s);
outf.puts(pad[len s % 4]);
outf.puts("\n\n");
bufcp(inf, outf, l);
outf.flush();
}
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