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Slightly clearer code in dsp_eq_update_data.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9231 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Dan Everton 2006-03-24 14:06:30 +00:00
parent c76904be53
commit fac50d12bf
1 changed files with 12 additions and 17 deletions
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29
apps/dsp.c
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@ -589,27 +589,24 @@ static void apply_crossfeed(int32_t* src[], int count)
}
#endif
#define EQ_CUTOFF_USER2REAL(x) (0xffffffff / NATIVE_FREQUENCY * (x))
#define EQ_Q_USER2REAL(x) (((x) << 16) / 10)
#define EQ_GAIN_USER2REAL(x) (((x) << 16) / 10)
/* Synchronize the EQ filters with the global settings */
void dsp_eq_update_data(bool enabled, int band)
{
int *setting;
int gain, cutoff, q;
const int *setting;
long gain;
unsigned long cutoff, q;
dsp->eq_enabled = enabled;
/* Adjust setting pointer to the band we actually want to change */
setting = &global_settings.eq_band0_cutoff + (band * 3);
cutoff = *setting++;
q = *setting++;
gain = *setting++;
DEBUGF("cutoff %d, q %d, gain %d\n", cutoff, q, gain);
/* Convert user settings to format required by coef generator functions */
cutoff = 0xffffffff / NATIVE_FREQUENCY * (*setting++);
q = ((*setting++) << 16) / 10; /* 16.16 */
gain = ((*setting++) << 16) / 10; /* s15.16 */
/* The coef functions assume the EMAC unit is in fractional mode */
#if defined(CPU_COLDFIRE) && !defined(SIMULATOR)
/* set emac unit for dsp processing, and save old macsr, we're running in
codec thread context at this point, so can't clobber it */
@ -617,18 +614,16 @@ void dsp_eq_update_data(bool enabled, int band)
coldfire_set_macsr(EMAC_FRACTIONAL | EMAC_SATURATE | EMAC_ROUND);
#endif
/* Assume a band is disabled if the gain is zero */
if (gain == 0) {
eq_data.enabled[band] = 0;
} else {
if (band == 0)
eq_ls_coefs(EQ_CUTOFF_USER2REAL(cutoff), EQ_Q_USER2REAL(q),
EQ_GAIN_USER2REAL(gain), eq_data.filters[band].coefs);
eq_ls_coefs(cutoff, q, gain, eq_data.filters[band].coefs);
else if (band == 4)
eq_hs_coefs(EQ_CUTOFF_USER2REAL(cutoff), EQ_Q_USER2REAL(q),
EQ_GAIN_USER2REAL(gain), eq_data.filters[band].coefs);
eq_hs_coefs(cutoff, q, gain, eq_data.filters[band].coefs);
else
eq_pk_coefs(EQ_CUTOFF_USER2REAL(cutoff), EQ_Q_USER2REAL(q),
EQ_GAIN_USER2REAL(gain), eq_data.filters[band].coefs);
eq_pk_coefs(cutoff, q, gain, eq_data.filters[band].coefs);
eq_data.enabled[band] = 1;
}