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