From 9ae8e23188fc2e533eea74757c9060557941d3d9 Mon Sep 17 00:00:00 2001 From: Christophe Gisquet Date: Fri, 14 Feb 2014 16:00:47 +0000 Subject: dcadsp: scan coefficients linearly instead. This change is inspired by x86 asm, where this frees a register. Signed-off-by: Michael Niedermayer --- libavcodec/dcadsp.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/libavcodec/dcadsp.c b/libavcodec/dcadsp.c index b14c4350ef..65df2798ed 100644 --- a/libavcodec/dcadsp.c +++ b/libavcodec/dcadsp.c @@ -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; } } -- cgit v1.2.3