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Simplify rms()

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Originally committed as revision 13276 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2008-05-24 09:19:21 +00:00
parent c2c237a0d5
commit 0853393979
1 changed files with 8 additions and 14 deletions
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22
libavcodec/ra144.c
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@ -181,30 +181,24 @@ static void final(const short *i1, const short *i2,
static unsigned int rms(const int *data, int f)
{
const int *c;
int x;
unsigned int res;
int b;
unsigned int res = 0x10000;
int b = 0;
c = data;
b = 0;
res = 0x10000;
for (x=0; x<10; x++) {
res = (((0x1000000 - (*c) * (*c)) >> 12) * res) >> 12;
res = (((0x1000000 - (*data) * (*data)) >> 12) * res) >> 12;
if (res == 0)
return 0;
if (res <= 0x3fff) {
while (res <= 0x3fff) {
b++;
res <<= 2;
}
} else {
if (res > 0x10000)
return 0; /* We're screwed, might as well go out with a bang. :P */
while (res <= 0x3fff) {
b++;
res <<= 2;
}
c++;
data++;
}
if (res > 0)