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Added audioop.reverse() which reverses an audio sample

This commit is contained in:
Jack Jansen 1993-02-23 13:39:57 +00:00
parent 36d330bf36
commit 337b20e23e
1 changed files with 40 additions and 0 deletions
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40
Modules/audioop.c
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@ -821,6 +821,45 @@ audioop_bias(self, args)
return rv;
}
static object *
audioop_reverse(self, args)
object *self;
object *args;
{
signed char *cp;
unsigned char *ncp;
int len, size, val;
object *rv;
int i, j;
if ( !getargs(args, "(s#i)",
&cp, &len, &size) )
return 0;
if ( size != 1 && size != 2 && size != 4 ) {
err_setstr(AudioopError, "Size should be 1, 2 or 4");
return 0;
}
rv = newsizedstringobject(NULL, len);
if ( rv == 0 )
return 0;
ncp = (unsigned char *)getstringvalue(rv);
for ( i=0; i < len; i += size ) {
if ( size == 1 ) val = ((int)*CHARP(cp, i)) << 8;
else if ( size == 2 ) val = (int)*SHORTP(cp, i);
else if ( size == 4 ) val = ((int)*LONGP(cp, i)) >> 16;
j = len - i - size;
if ( size == 1 ) *CHARP(ncp, j) = (signed char)(val >> 8);
else if ( size == 2 ) *SHORTP(ncp, j) = (short)(val);
else if ( size == 4 ) *LONGP(ncp, j) = (long)(val<<16);
}
return rv;
}
static object *
audioop_lin2lin(self, args)
object *self;
@ -1286,6 +1325,7 @@ static struct methodlist audioop_methods[] = {
{ "tomono", audioop_tomono },
{ "tostereo", audioop_tostereo },
{ "getsample", audioop_getsample },
{ "reverse", audioop_reverse },
{ 0, 0 }
};