Altivec unscaled YV12 -> packed YUV patch by (Romain Dolbeau <dolbeau at irisa dot fr>)

Originally committed as revision 12769 to svn://svn.mplayerhq.hu/mplayer/trunk/postproc

postproc/swscale.c

@@ -1909,6 +1909,18 @@ SwsContext *sws_getContext(int srcW, int srcH, int origSrcFormat, int dstW, int
 			}
 		}
 
+#ifdef HAVE_ALTIVEC
+		if ((c->flags & SWS_CPU_CAPS_ALTIVEC) &&
+		    ((srcFormat == IMGFMT_YV12 && 
+		      (dstFormat == IMGFMT_YUY2 || dstFormat == IMGFMT_UYVY)))) {
+		  // unscaled YV12 -> packed YUV, we want speed
+		  if (dstFormat == IMGFMT_YUY2)
+		    c->swScale= yv12toyuy2_unscaled_altivec;
+		  else
+		    c->swScale= yv12touyvy_unscaled_altivec;
+		}
+#endif
+
 		/* simple copy */
 		if(   srcFormat == dstFormat
 		   || (isPlanarYUV(srcFormat) && isGray(dstFormat))

postproc/swscale_altivec_template.c

@@ -383,3 +383,150 @@ static inline void hScale_altivec_real(int16_t *dst, int dstW, uint8_t *src, int
     }
   }
 }
+
+static inline int yv12toyuy2_unscaled_altivec(SwsContext *c, uint8_t* src[], int srcStride[], int srcSliceY,
+     int srcSliceH, uint8_t* dstParam[], int dstStride_a[]) {
+  uint8_t *dst=dstParam[0] + dstStride_a[0]*srcSliceY;
+  // yv12toyuy2( src[0],src[1],src[2],dst,c->srcW,srcSliceH,srcStride[0],srcStride[1],dstStride[0] );
+  uint8_t *ysrc = src[0];
+  uint8_t *usrc = src[1];
+  uint8_t *vsrc = src[2];
+  const int width = c->srcW;
+  const int height = srcSliceH;
+  const int lumStride = srcStride[0];
+  const int chromStride = srcStride[1];
+  const int dstStride = dstStride_a[0];
+  const vector unsigned char yperm = vec_lvsl(0, ysrc);
+  const int vertLumPerChroma = 2;  
+  register unsigned int y;
+
+  /* this code assume:
+
+  1) dst is 16 bytes-aligned
+  2) dstStride is a multiple of 16
+  3) width is a multiple of 16
+  4) lum&chrom stride are multiple of 8
+  */
+  
+  for(y=0; y<height; y++)
+    {
+      int i;
+      for (i = 0; i < width - 31; i+= 32) {
+	const unsigned int j = i >> 1;
+	vector unsigned char v_yA = vec_ld(i, ysrc);
+	vector unsigned char v_yB = vec_ld(i + 16, ysrc);
+	vector unsigned char v_yC = vec_ld(i + 32, ysrc);
+	vector unsigned char v_y1 = vec_perm(v_yA, v_yB, yperm);
+	vector unsigned char v_y2 = vec_perm(v_yB, v_yC, yperm);
+	vector unsigned char v_uA = vec_ld(j, usrc);
+	vector unsigned char v_uB = vec_ld(j + 16, usrc);
+	vector unsigned char v_u = vec_perm(v_uA, v_uB, vec_lvsl(j, usrc));
+	vector unsigned char v_vA = vec_ld(j, vsrc);
+	vector unsigned char v_vB = vec_ld(j + 16, vsrc);
+	vector unsigned char v_v = vec_perm(v_vA, v_vB, vec_lvsl(j, vsrc));
+	vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
+	vector unsigned char v_uv_b = vec_mergel(v_u, v_v);
+	vector unsigned char v_yuy2_0 = vec_mergeh(v_y1, v_uv_a);
+	vector unsigned char v_yuy2_1 = vec_mergel(v_y1, v_uv_a);
+	vector unsigned char v_yuy2_2 = vec_mergeh(v_y2, v_uv_b);
+	vector unsigned char v_yuy2_3 = vec_mergel(v_y2, v_uv_b);
+	vec_st(v_yuy2_0, (i << 1), dst);
+	vec_st(v_yuy2_1, (i << 1) + 16, dst);
+	vec_st(v_yuy2_2, (i << 1) + 32, dst);
+	vec_st(v_yuy2_3, (i << 1) + 48, dst);
+      }
+      if (i < width) {
+	const unsigned int j = i >> 1;
+	vector unsigned char v_y1 = vec_ld(i, ysrc);
+	vector unsigned char v_u = vec_ld(j, usrc);
+	vector unsigned char v_v = vec_ld(j, vsrc);
+	vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
+	vector unsigned char v_yuy2_0 = vec_mergeh(v_y1, v_uv_a);
+	vector unsigned char v_yuy2_1 = vec_mergel(v_y1, v_uv_a);
+	vec_st(v_yuy2_0, (i << 1), dst);
+	vec_st(v_yuy2_1, (i << 1) + 16, dst);
+      }
+      if((y&(vertLumPerChroma-1))==(vertLumPerChroma-1) )
+	{
+	  usrc += chromStride;
+	  vsrc += chromStride;
+	}
+      ysrc += lumStride;
+      dst += dstStride;
+    }
+  
+  return srcSliceH;
+}
+
+static inline int yv12touyvy_unscaled_altivec(SwsContext *c, uint8_t* src[], int srcStride[], int srcSliceY,
+     int srcSliceH, uint8_t* dstParam[], int dstStride_a[]) {
+  uint8_t *dst=dstParam[0] + dstStride_a[0]*srcSliceY;
+  // yv12toyuy2( src[0],src[1],src[2],dst,c->srcW,srcSliceH,srcStride[0],srcStride[1],dstStride[0] );
+  uint8_t *ysrc = src[0];
+  uint8_t *usrc = src[1];
+  uint8_t *vsrc = src[2];
+  const int width = c->srcW;
+  const int height = srcSliceH;
+  const int lumStride = srcStride[0];
+  const int chromStride = srcStride[1];
+  const int dstStride = dstStride_a[0];
+  const int vertLumPerChroma = 2;
+  const vector unsigned char yperm = vec_lvsl(0, ysrc);
+  register unsigned int y;
+
+  /* this code assume:
+
+  1) dst is 16 bytes-aligned
+  2) dstStride is a multiple of 16
+  3) width is a multiple of 16
+  4) lum&chrom stride are multiple of 8
+  */
+  
+  for(y=0; y<height; y++)
+    {
+      int i;
+      for (i = 0; i < width - 31; i+= 32) {
+	const unsigned int j = i >> 1;
+	vector unsigned char v_yA = vec_ld(i, ysrc);
+	vector unsigned char v_yB = vec_ld(i + 16, ysrc);
+	vector unsigned char v_yC = vec_ld(i + 32, ysrc);
+	vector unsigned char v_y1 = vec_perm(v_yA, v_yB, yperm);
+	vector unsigned char v_y2 = vec_perm(v_yB, v_yC, yperm);
+	vector unsigned char v_uA = vec_ld(j, usrc);
+	vector unsigned char v_uB = vec_ld(j + 16, usrc);
+	vector unsigned char v_u = vec_perm(v_uA, v_uB, vec_lvsl(j, usrc));
+	vector unsigned char v_vA = vec_ld(j, vsrc);
+	vector unsigned char v_vB = vec_ld(j + 16, vsrc);
+	vector unsigned char v_v = vec_perm(v_vA, v_vB, vec_lvsl(j, vsrc));
+	vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
+	vector unsigned char v_uv_b = vec_mergel(v_u, v_v);
+	vector unsigned char v_uyvy_0 = vec_mergeh(v_uv_a, v_y1);
+	vector unsigned char v_uyvy_1 = vec_mergel(v_uv_a, v_y1);
+	vector unsigned char v_uyvy_2 = vec_mergeh(v_uv_b, v_y2);
+	vector unsigned char v_uyvy_3 = vec_mergel(v_uv_b, v_y2);
+	vec_st(v_uyvy_0, (i << 1), dst);
+	vec_st(v_uyvy_1, (i << 1) + 16, dst);
+	vec_st(v_uyvy_2, (i << 1) + 32, dst);
+	vec_st(v_uyvy_3, (i << 1) + 48, dst);
+      }
+      if (i < width) {
+	const unsigned int j = i >> 1;
+	vector unsigned char v_y1 = vec_ld(i, ysrc);
+	vector unsigned char v_u = vec_ld(j, usrc);
+	vector unsigned char v_v = vec_ld(j, vsrc);
+	vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
+	vector unsigned char v_uyvy_0 = vec_mergeh(v_uv_a, v_y1);
+	vector unsigned char v_uyvy_1 = vec_mergel(v_uv_a, v_y1);
+	vec_st(v_uyvy_0, (i << 1), dst);
+	vec_st(v_uyvy_1, (i << 1) + 16, dst);
+      }
+      if((y&(vertLumPerChroma-1))==(vertLumPerChroma-1) )
+	{
+	  usrc += chromStride;
+	  vsrc += chromStride;
+	}
+      ysrc += lumStride;
+      dst += dstStride;
+    }
+  return srcSliceH;
+}