Finally a 1st optimization patch for jpeg2000!
To start: an easy one.
The main help I need: is where and how to put the SSE optimzation in the
x86 directory.
Cheers
Nicolas
---
libavcodec/jpeg2000dec.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 55 insertions(+)
diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index aed9b2b..3b7df1e 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -28,6 +28,10 @@
#include <inttypes.h>
#include "libavutil/attributes.h"
+#ifdef __SSE__
+#include <xmmintrin.h>
+#endif
+
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "avcodec.h"
@@ -1056,6 +1060,52 @@ static const int i_ict_params[4] = {
116130
};
+static void mct_decode_sse(
+ float* restrict c0,
+ float* restrict c1,
+ float* restrict c2,
+ int n)
+{
+ int i;
+ __m128 vrv, vgu, vgv, vbu;
+ vrv = _mm_set1_ps(1.402f);
+ vgu = _mm_set1_ps(0.34413f);
+ vgv = _mm_set1_ps(0.71414f);
+ vbu = _mm_set1_ps(1.772f);
+ for (i = 0; i < (n >> 3); ++i) {
+ __m128 vy, vu, vv;
+ __m128 vr, vg, vb;
+
+ vy = _mm_load_ps(c0);
+ vu = _mm_load_ps(c1);
+ vv = _mm_load_ps(c2);
+ vr = _mm_add_ps(vy, _mm_mul_ps(vv, vrv));
+ vg = _mm_sub_ps(_mm_sub_ps(vy, _mm_mul_ps(vu, vgu)), _mm_mul_ps(vv,
vgv));
+ vb = _mm_add_ps(vy, _mm_mul_ps(vu, vbu));
+ _mm_store_ps(c0, vr);
+ _mm_store_ps(c1, vg);
+ _mm_store_ps(c2, vb);
+ c0 += 4;
+ c1 += 4;
+ c2 += 4;
+
+ vy = _mm_load_ps(c0);
+ vu = _mm_load_ps(c1);
+ vv = _mm_load_ps(c2);
+ vr = _mm_add_ps(vy, _mm_mul_ps(vv, vrv));
+ vg = _mm_sub_ps(_mm_sub_ps(vy, _mm_mul_ps(vu, vgu)), _mm_mul_ps(vv,
vgv));
+ vb = _mm_add_ps(vy, _mm_mul_ps(vu, vbu));
+ _mm_store_ps(c0, vr);
+ _mm_store_ps(c1, vg);
+ _mm_store_ps(c2, vb);
+ c0 += 4;
+ c1 += 4;
+ c2 += 4;
+ }
+ n &= 7;
+}
+
+
static void mct_decode(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
{
int i, csize = 1;
@@ -1072,6 +1122,10 @@ static void mct_decode(Jpeg2000DecoderContext *s,
Jpeg2000Tile *tile)
csize *= tile->comp[0].coord[i][1] - tile->comp[0].coord[i][0];
switch (tile->codsty[0].transform) {
case FF_DWT97:
+#ifdef __SSE__
+ mct_decode_sse(srcf[0], srcf[1], srcf[2], csize);
+#else
+
for (i = 0; i < csize; i++) {
i0f = *srcf[0] + (f_ict_params[0] * *srcf[2]);
i1f = *srcf[0] - (f_ict_params[1] * *srcf[1])
@@ -1081,6 +1135,7 @@ static void mct_decode(Jpeg2000DecoderContext *s,
Jpeg2000Tile *tile)
*srcf[1]++ = i1f;
*srcf[2]++ = i2f;
}
+#endif
break;
case FF_DWT97_INT:
for (i = 0; i < csize; i++) {
--
1.7.9.5
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