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libaf: Remove rational number implementation

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Remove the mul/cancel/gcd functions and some related code. Use ff_gcd
instead of the removed af_gcd in af_resample.c.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@24917 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
uau 2007-11-01 06:52:06 +00:00
parent 7deec05ea0
commit ab2237c15a
3 changed files with 3 additions and 59 deletions
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47
libaf/af.c
View File

@ -604,53 +604,6 @@ af_instance_t *af_control_any_rev (af_stream_t* s, int cmd, void* arg) {
return NULL;
}
/**
* \brief calculate greatest common divisior of a and b.
* \ingroup af_filter
*
* If both are 0 the result is 1.
*/
int af_gcd(register int a, register int b) {
while (b != 0) {
a %= b;
if (a == 0)
break;
b %= a;
}
// the result is either in a or b. As the other one is 0 just add them.
a += b;
if (!a)
return 1;
return a;
}
/**
* \brief cancel down a fraction f
* \param f fraction to cancel down
* \ingroup af_filter
*/
void af_frac_cancel(frac_t *f) {
int gcd = af_gcd(f->n, f->d);
f->n /= gcd;
f->d /= gcd;
}
/**
* \brief multiply out by in and store result in out.
* \param out [inout] fraction to multiply by in
* \param in [in] fraction to multiply out by
* \ingroup af_filter
*
* the resulting fraction will be cancelled down
* if in and out were.
*/
void af_frac_mul(frac_t *out, const frac_t *in) {
int gcd1 = af_gcd(out->n, in->d);
int gcd2 = af_gcd(in->n, out->d);
out->n = (out->n / gcd1) * (in->n / gcd2);
out->d = (out->d / gcd2) * (in->d / gcd1);
}
void af_help (void) {
int i = 0;
af_msg(AF_MSG_INFO, "Available audio filters:\n");

10
libaf/af.h
View File

@ -26,16 +26,6 @@ typedef struct af_data_s
int bps; // bytes per sample
} af_data_t;
// Fraction, used to calculate buffer lengths
typedef struct frac_s
{
int n; // Numerator
int d; // Denominator
} frac_t;
int af_gcd(register int a, register int b);
void af_frac_cancel(frac_t *f);
void af_frac_mul(frac_t *out, const frac_t *in);
// Flags used for defining the behavior of an audio filter
#define AF_FLAGS_REENTRANT 0x00000000

5
libaf/af_resample.c
View File

@ -13,6 +13,7 @@
#include <stdlib.h>
#include <inttypes.h>
#include "libavutil/common.h"
#include "af.h"
#include "dsp.h"
@ -189,7 +190,7 @@ static int control(struct af_instance_s* af, int cmd, void* arg)
}
// Calculate up and down sampling factors
d=af_gcd(af->data->rate,n->rate);
d=ff_gcd(af->data->rate,n->rate);
// If sloppy resampling is enabled limit the upsampling factor
if(((s->setup & FREQ_MASK) == FREQ_SLOPPY) && (af->data->rate/d > 5000)){
@ -197,7 +198,7 @@ static int control(struct af_instance_s* af, int cmd, void* arg)
int dn=n->rate/2;
int m=2;
while(af->data->rate/(d*m) > 5000){
d=af_gcd(up,dn);
d=ff_gcd(up,dn);
up/=2; dn/=2; m*=2;
}
d*=m;