virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2025-01-24 13:56:33 +02:00
Code Issues Releases Activity

dcadsp: scan coefficients linearly instead.

Browse Source 
This change is inspired by x86 asm, where this frees a register.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Christophe Gisquet 2014-02-14 16:00:47 +00:00 committed by Michael Niedermayer
parent 5a48caa34b
commit 9ae8e23188
1 changed files with 7 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
libavcodec/dcadsp.c
View File

@ -36,22 +36,22 @@ static inline void
dca_lfe_fir(float *out, const float *in, const float *coefs,
int decifactor, float scale)
{
float *out2 = out + decifactor;
float *out2 = out + 2*decifactor-1;
const float *cf0 = coefs;
const float *cf1 = coefs + 256;
int num_coeffs = 256 / decifactor;
int j, k;
/* One decimated sample generates 2*decifactor interpolated ones */
for (k = 0; k < decifactor; k++) {
float v0 = 0.0;
float v1 = 0.0;
for (j = 0; j < 256 / decifactor; j++) {
float s = in[-j];
v0 += s * *cf0++;
v1 += s * *--cf1;
for (j = 0; j < num_coeffs; j++, cf0++) {
v0 += in[-j] * *cf0;
v1 += in[1+j-num_coeffs] * *cf0;
}
*out++ = v0 * scale;
*out2++ = v1 * scale;
*out2-- = v1 * scale;
}
}