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Added lin2lin, findmax, findfactor and fintfit routines

This commit is contained in:
Jack Jansen 1993-02-17 14:21:09 +00:00
parent 22e44cd0b5
commit dd8a6eac57
1 changed files with 51 additions and 10 deletions
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61
Modules/audioop.c
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@ -270,6 +270,46 @@ audioop_rms(self, args)
return newintobject(val);
}
static object *
audioop_rms2(self, args)
object *self;
object *args;
{
signed char *cp1, *cp2;
int len1, len2, size, val1, val2;
int i;
float sum_squares = 0.0;
if ( !getargs(args, "(s#s#i)", &cp1, &len1, &cp2, &len2, &size) )
return 0;
if ( size != 1 && size != 2 && size != 4 ) {
err_setstr(AudioopError, "Size should be 1, 2 or 4");
return 0;
}
if ( len1 != len2 ) {
err_setstr(AudioopError, "Samples should be same size");
return 0;
}
for ( i=0; i<len1; i+= size) {
if ( size == 1 ) {
val1 = (int)*CHARP(cp1, i);
val2 = (int)*CHARP(cp2, i);
} else if ( size == 2 ) {
val1 = (int)*SHORTP(cp1, i);
val2 = (int)*SHORTP(cp2, i);
} else if ( size == 4 ) {
val1 = (int)*LONGP(cp1, i);
val2 = (int)*LONGP(cp2, i);
}
sum_squares += (float)val1*(float)val2;
}
if ( len1 == 0 )
val1 = 0;
else
val1 = (int)sqrt(sum_squares / (float)(len1/size));
return newintobject(val1);
}
static object *
audioop_avgpp(self, args)
object *self;
@ -731,6 +771,11 @@ audioop_lin2adpcm3(self, args)
return 0;
}
str = newsizedstringobject(NULL, len/size);
if ( str == 0 )
return 0;
ncp = (signed char *)getstringvalue(str);
/* Decode state, should have (value, step) */
if ( state == None ) {
/* First time, it seems. Set defaults */
@ -739,11 +784,6 @@ audioop_lin2adpcm3(self, args)
} else if ( !getargs(state, "(ii)", &valprev, &step) )
return 0;
str = newsizedstringobject(NULL, len/size);
if ( str == 0 )
return 0;
ncp = (signed char *)getstringvalue(str);
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);
@ -861,6 +901,11 @@ audioop_lin2adpcm(self, args)
return 0;
}
str = newsizedstringobject(NULL, len/(size*2));
if ( str == 0 )
return 0;
ncp = (signed char *)getstringvalue(str);
/* Decode state, should have (value, step) */
if ( state == None ) {
/* First time, it seems. Set defaults */
@ -870,11 +915,6 @@ audioop_lin2adpcm(self, args)
} else if ( !getargs(state, "(ii)", &valpred, &index) )
return 0;
str = newsizedstringobject(NULL, len/(size*2));
if ( str == 0 )
return 0;
ncp = (signed char *)getstringvalue(str);
step = stepsizeTable[index];
bufferstep = 1;
@ -1048,6 +1088,7 @@ static struct methodlist audioop_methods[] = {
{ "maxpp", audioop_maxpp },
{ "avgpp", audioop_avgpp },
{ "rms", audioop_rms },
{ "rms2", audioop_rms2 },
{ "cross", audioop_cross },
{ "mul", audioop_mul },
{ "add", audioop_add },