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Simplify final() 

Originally committed as revision 13277 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2008-05-24 09:20:09 +00:00
parent 0853393979
commit 2279dd9e41
1 changed files with 12 additions and 17 deletions
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29
libavcodec/ra144.c
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@ -145,38 +145,33 @@ static void add_wav(int n, int f, int m1, int m2, int m3, const short *s1,
static void final(const short *i1, const short *i2,
void *out, int *statbuf, int len)
{
int x, sum, i;
int buffer[10];
short *ptr;
short *ptr2;
int x, i;
unsigned short int work[50];
short *ptr = work;
memcpy(work, statbuf,20);
memcpy(work + 10, i2, len * 2);
for(i=0; i<10; i++)
buffer[9-i] = i1[i];
for (i=0; i<len; i++) {
int sum = 0;
ptr2 = (ptr = work) + len;
for(x=0; x<10; x++)
sum += i1[9-x] * ptr[x];
while (ptr < ptr2) {
for(sum=0, x=0; x<=9; x++)
sum += buffer[x] * (ptr[x]);
sum >>= 12;
sum = sum >> 12;
x = ptr[10] - sum;
if (x<-32768 || x>32767) {
if (ptr[10] - sum < -32768 || ptr[10] - sum > 32767) {
memset(out, 0, len * 2);
memset(statbuf, 0, 20);
return;
}
ptr[10] = x;
ptr[10] -= sum;
ptr++;
}
memcpy(out, ptr+10 - len, len * 2);
memcpy(statbuf, ptr, 20);
memcpy(out, work+10, len * 2);
memcpy(statbuf, work + 40, 20);
}
static unsigned int rms(const int *data, int f)