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equalizer: Use floating point arithmetic internally for the int16 mode

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By using int32 arithmetic we will introduce distortions as the
IIR filter is very sensitive to rounding errors. Fixes bug #580214.
This commit is contained in:
Ghislain 'Aus' Lacroix 2009-05-28 12:39:46 +02:00 committed by Sebastian Dröge
parent 0c61b20ac6
commit 9507cdc84c
1 changed files with 6 additions and 6 deletions
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12
gst/equalizer/gstiirequalizer.c
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@ -392,9 +392,9 @@ setup_filter (GstIirEqualizer * equ, GstIirEqualizerBand * band)
gain = arg_to_scale (band->gain);
if (band->freq / GST_AUDIO_FILTER (equ)->format.rate > 0.5)
if (band->freq / GST_AUDIO_FILTER (equ)->format.rate >= 0.5)
omega = M_PI;
else if (band->freq < 0.0)
else if (band->freq <= 0.0)
omega = 0.0;
else
omega = 2.0 * M_PI * (band->freq / GST_AUDIO_FILTER (equ)->format.rate);
@ -557,9 +557,9 @@ one_step_ ## TYPE (GstIirEqualizerBand *filter, \
SecondOrderHistory ## TYPE *history, BIG_TYPE input) \
{ \
/* calculate output */ \
BIG_TYPE output = floor (filter->a0 * input + \
BIG_TYPE output = filter->a0 * input + \
filter->a1 * history->x1 + filter->a2 * history->x2 + \
filter->b1 * history->y1 + filter->b2 * history->y2 + 0.5); \
filter->b1 * history->y1 + filter->b2 * history->y2; \
/* update history */ \
history->y2 = history->y1; \
history->y1 = output; \
@ -591,7 +591,7 @@ guint size, guint channels) \
history++; \
} \
cur = CLAMP (cur, MIN_VAL, MAX_VAL); \
*((TYPE *) data) = (TYPE) cur; \
*((TYPE *) data) = (TYPE) floor (cur); \
data += sizeof (TYPE); \
} \
} \
@ -647,7 +647,7 @@ guint size, guint channels) \
} \
}
CREATE_OPTIMIZED_FUNCTIONS_INT (gint16, gint32, -32768, 32767);
CREATE_OPTIMIZED_FUNCTIONS_INT (gint16, gfloat, -32768.0, 32767.0);
CREATE_OPTIMIZED_FUNCTIONS (gfloat);
CREATE_OPTIMIZED_FUNCTIONS (gdouble);