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utils: move common correction code in a macro

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This commit is contained in:
Wim Taymans 2009-08-28 12:19:34 +02:00
parent 378594e520
commit 2b66b29355
1 changed files with 16 additions and 28 deletions
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44
gst/gstutils.c
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@ -349,6 +349,18 @@ gst_util_div96_32 (guint64 c1, guint64 c0, guint32 denom)
return ((c1 / denom) << 32) + (c0 / denom); return ((c1 / denom) << 32) + (c0 / denom);
} }
/* add correction with carry */
#define CORRECT(c0,c1,val) \
if (val) { \
if (G_MAXUINT64 - c0.ll < val) { \
if (G_UNLIKELY (c1.ll == G_MAXUINT64)) \
/* overflow */ \
return G_MAXUINT64; \
c1.ll++; \
} \
c0.ll += val; \
}
static guint64 static guint64
gst_util_uint64_scale_uint64_unchecked (guint64 val, guint64 num, gst_util_uint64_scale_uint64_unchecked (guint64 val, guint64 num,
guint64 denom, GstRoundingMode mode) guint64 denom, GstRoundingMode mode)
@ -362,24 +374,12 @@ gst_util_uint64_scale_uint64_unchecked (guint64 val, guint64 num,
switch (mode) { switch (mode) {
case GST_ROUND_TONEAREST: case GST_ROUND_TONEAREST:
/* add 1/2 the denominator to the numerator with carry */ /* add 1/2 the denominator to the numerator with carry */
if (G_MAXUINT64 - c0.ll < denom / 2) { CORRECT (c0, c1, denom / 2);
if (G_UNLIKELY (c1.ll == G_MAXUINT64))
/* overflow */
return G_MAXUINT64;
c1.ll++;
}
c0.ll += denom / 2;
break; break;
case GST_ROUND_UP: case GST_ROUND_UP:
/* add denominator - 1 to the numerator with carry */ /* add denominator - 1 to the numerator with carry */
if (G_MAXUINT64 - c0.ll < denom - 1) { CORRECT (c0, c1, denom - 1);
if (G_UNLIKELY (c1.ll == G_MAXUINT64))
/* overflow */
return G_MAXUINT64;
c1.ll++;
}
c0.ll += denom - 1;
break; break;
case GST_ROUND_DOWN: case GST_ROUND_DOWN:
@ -408,24 +408,12 @@ gst_util_uint64_scale_uint32_unchecked (guint64 val, guint32 num,
switch (mode) { switch (mode) {
case GST_ROUND_TONEAREST: case GST_ROUND_TONEAREST:
/* add 1/2 the denominator to the numerator with carry */ /* add 1/2 the denominator to the numerator with carry */
if (G_MAXUINT64 - c0.ll < denom / 2) { CORRECT (c0, c1, denom / 2);
if (G_UNLIKELY (c1.ll == G_MAXUINT64))
/* overflow */
return G_MAXUINT64;
c1.ll++;
}
c0.ll += denom / 2;
break; break;
case GST_ROUND_UP: case GST_ROUND_UP:
/* add denominator - 1 to the numerator with carry */ /* add denominator - 1 to the numerator with carry */
if (G_MAXUINT64 - c0.ll < denom - 1) { CORRECT (c0, c1, denom - 1);
if (G_UNLIKELY (c1.ll == G_MAXUINT64))
/* overflow */
return G_MAXUINT64;
c1.ll++;
}
c0.ll += denom - 1;
break; break;
case GST_ROUND_DOWN: case GST_ROUND_DOWN: