[SCM] libav/experimental: software yv12->rgb scaler - separated from fsdga
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 30 15:30:09 UTC 2013
The following commit has been merged in the experimental branch:
commit 31190492f9aae8a92fe589f4749a0fb678b73387
Author: Arpi <arpi at thot.banki.hu>
Date: Mon Oct 15 18:59:44 2001 +0000
software yv12->rgb scaler - separated from fsdga
Originally committed as revision 2217 to svn://svn.mplayerhq.hu/mplayer/trunk/postproc
diff --git a/postproc/swscale.c b/postproc/swscale.c
new file mode 100644
index 0000000..b761564
--- /dev/null
+++ b/postproc/swscale.c
@@ -0,0 +1,124 @@
+
+// Software scaling and colorspace conversion routines for MPlayer
+
+// temporary storage for 4 yuv lines:
+static unsigned int pix_buf_y[4][2048];
+static unsigned int pix_buf_uv[2][2048*2];
+
+// clipping helper table for C implementations:
+static unsigned char clip_table[768];
+
+// yuv->rgb conversion tables:
+static int yuvtab_2568[256];
+static int yuvtab_3343[256];
+static int yuvtab_0c92[256];
+static int yuvtab_1a1e[256];
+static int yuvtab_40cf[256];
+
+// *** bilinear scaling and yuv->rgb conversion of yv12 slices:
+// *** Note: it's called multiple times while decoding a frame, first time y==0
+// *** Designed to upscale, but may work for downscale too.
+// s_xinc = (src_width << 8) / dst_width
+// s_yinc = (src_height << 16) / dst_height
+void SwScale_YV12slice_brg24(unsigned char* srcptr[],int stride[], int y, int h,
+ unsigned char* dstptr, int dststride, int dstw, int dstbpp,
+ unsigned int s_xinc,unsigned int s_yinc){
+
+// scaling factors:
+//static int s_yinc=(vo_dga_src_height<<16)/vo_dga_vp_height;
+//static int s_xinc=(vo_dga_src_width<<8)/vo_dga_vp_width;
+
+unsigned int s_xinc2=s_xinc>>1;
+
+static int s_srcypos;
+static int s_ypos;
+static int s_last_ypos;
+
+ if(y==0){
+ s_srcypos=-2*s_yinc;
+ s_ypos=-2;
+ s_last_ypos=-2;
+ } // reset counters
+
+ while(1){
+ unsigned char *dest=dstptr+dststride*s_ypos;
+ int y0=2+(s_srcypos>>16);
+ int y1=1+(s_srcypos>>17);
+ int yalpha=(s_srcypos&0xFFFF)>>8;
+ int yalpha1=yalpha^255;
+ int uvalpha=((s_srcypos>>1)&0xFFFF)>>8;
+ int uvalpha1=uvalpha^255;
+ unsigned int *buf0=pix_buf_y[y0&3];
+ unsigned int *buf1=pix_buf_y[((y0+1)&3)];
+ unsigned int *uvbuf0=pix_buf_uv[y1&1];
+ unsigned int *uvbuf1=pix_buf_uv[(y1&1)^1];
+ int i;
+
+ if(y0>=y+h) break;
+
+ s_ypos++; s_srcypos+=s_yinc;
+
+ if(s_last_ypos!=y0){
+ unsigned char *src=srcptr[0]+(y0-y)*stride[0];
+ unsigned int xpos=0;
+ s_last_ypos=y0;
+ // *** horizontal scale Y line to temp buffer
+ // this loop should be rewritten in MMX assembly!!!!
+ for(i=0;i<dstw;i++){
+ register unsigned int xx=xpos>>8;
+ register unsigned int xalpha=xpos&0xFF;
+ buf1[i]=(src[xx]*(xalpha^255)+src[xx+1]*xalpha);
+ xpos+=s_xinc;
+ }
+ // *** horizontal scale U and V lines to temp buffer
+ if(!(y0&1)){
+ unsigned char *src1=srcptr[1]+(y1-y/2)*stride[1];
+ unsigned char *src2=srcptr[2]+(y1-y/2)*stride[2];
+ xpos=0;
+ // this loop should be rewritten in MMX assembly!!!!
+ for(i=0;i<dstw;i++){
+ register unsigned int xx=xpos>>8;
+ register unsigned int xalpha=xpos&0xFF;
+ uvbuf1[i]=(src1[xx]*(xalpha^255)+src1[xx+1]*xalpha);
+ uvbuf1[i+2048]=(src2[xx]*(xalpha^255)+src2[xx+1]*xalpha);
+ xpos+=s_xinc2;
+ }
+ }
+ if(!y0) continue;
+ }
+
+ // this loop should be rewritten in MMX assembly!!!!
+ // Note1: this code can be resticted to n*8 (or n*16) width lines to simplify optimization...
+ // Note2: instead of using lookup tabs, mmx version could do the multiply...
+ // Note3: maybe we should make separated 15/16, 24 and 32bpp version of this:
+ for(i=0;i<dstw;i++){
+ // vertical linear interpolation && yuv2rgb in a single step:
+ int Y=yuvtab_2568[((buf0[i]*yalpha1+buf1[i]*yalpha)>>16)];
+ int U=((uvbuf0[i]*uvalpha1+uvbuf1[i]*uvalpha)>>16);
+ int V=((uvbuf0[i+2048]*uvalpha1+uvbuf1[i+2048]*uvalpha)>>16);
+ dest[0]=clip_table[((Y + yuvtab_3343[U]) >>13)];
+ dest[1]=clip_table[((Y + yuvtab_0c92[V] + yuvtab_1a1e[U]) >>13)];
+ dest[2]=clip_table[((Y + yuvtab_40cf[V]) >>13)];
+ dest+=dstbpp;
+ }
+
+ }
+
+}
+
+
+void SwScale_Init(){
+ // generating tables:
+ int i;
+ for(i=0;i<256;i++){
+ clip_table[i]=0;
+ clip_table[i+256]=i;
+ clip_table[i+512]=255;
+ yuvtab_2568[i]=(0x2568*(i-16))+(256<<13);
+ yuvtab_3343[i]=0x3343*(i-128);
+ yuvtab_0c92[i]=-0x0c92*(i-128);
+ yuvtab_1a1e[i]=-0x1a1e*(i-128);
+ yuvtab_40cf[i]=0x40cf*(i-128);
+ }
+
+}
diff --git a/postproc/swscale_template.c b/postproc/swscale_template.c
new file mode 100644
index 0000000..b761564
--- /dev/null
+++ b/postproc/swscale_template.c
@@ -0,0 +1,124 @@
+
+// Software scaling and colorspace conversion routines for MPlayer
+
+// temporary storage for 4 yuv lines:
+static unsigned int pix_buf_y[4][2048];
+static unsigned int pix_buf_uv[2][2048*2];
+
+// clipping helper table for C implementations:
+static unsigned char clip_table[768];
+
+// yuv->rgb conversion tables:
+static int yuvtab_2568[256];
+static int yuvtab_3343[256];
+static int yuvtab_0c92[256];
+static int yuvtab_1a1e[256];
+static int yuvtab_40cf[256];
+
+// *** bilinear scaling and yuv->rgb conversion of yv12 slices:
+// *** Note: it's called multiple times while decoding a frame, first time y==0
+// *** Designed to upscale, but may work for downscale too.
+// s_xinc = (src_width << 8) / dst_width
+// s_yinc = (src_height << 16) / dst_height
+void SwScale_YV12slice_brg24(unsigned char* srcptr[],int stride[], int y, int h,
+ unsigned char* dstptr, int dststride, int dstw, int dstbpp,
+ unsigned int s_xinc,unsigned int s_yinc){
+
+// scaling factors:
+//static int s_yinc=(vo_dga_src_height<<16)/vo_dga_vp_height;
+//static int s_xinc=(vo_dga_src_width<<8)/vo_dga_vp_width;
+
+unsigned int s_xinc2=s_xinc>>1;
+
+static int s_srcypos;
+static int s_ypos;
+static int s_last_ypos;
+
+ if(y==0){
+ s_srcypos=-2*s_yinc;
+ s_ypos=-2;
+ s_last_ypos=-2;
+ } // reset counters
+
+ while(1){
+ unsigned char *dest=dstptr+dststride*s_ypos;
+ int y0=2+(s_srcypos>>16);
+ int y1=1+(s_srcypos>>17);
+ int yalpha=(s_srcypos&0xFFFF)>>8;
+ int yalpha1=yalpha^255;
+ int uvalpha=((s_srcypos>>1)&0xFFFF)>>8;
+ int uvalpha1=uvalpha^255;
+ unsigned int *buf0=pix_buf_y[y0&3];
+ unsigned int *buf1=pix_buf_y[((y0+1)&3)];
+ unsigned int *uvbuf0=pix_buf_uv[y1&1];
+ unsigned int *uvbuf1=pix_buf_uv[(y1&1)^1];
+ int i;
+
+ if(y0>=y+h) break;
+
+ s_ypos++; s_srcypos+=s_yinc;
+
+ if(s_last_ypos!=y0){
+ unsigned char *src=srcptr[0]+(y0-y)*stride[0];
+ unsigned int xpos=0;
+ s_last_ypos=y0;
+ // *** horizontal scale Y line to temp buffer
+ // this loop should be rewritten in MMX assembly!!!!
+ for(i=0;i<dstw;i++){
+ register unsigned int xx=xpos>>8;
+ register unsigned int xalpha=xpos&0xFF;
+ buf1[i]=(src[xx]*(xalpha^255)+src[xx+1]*xalpha);
+ xpos+=s_xinc;
+ }
+ // *** horizontal scale U and V lines to temp buffer
+ if(!(y0&1)){
+ unsigned char *src1=srcptr[1]+(y1-y/2)*stride[1];
+ unsigned char *src2=srcptr[2]+(y1-y/2)*stride[2];
+ xpos=0;
+ // this loop should be rewritten in MMX assembly!!!!
+ for(i=0;i<dstw;i++){
+ register unsigned int xx=xpos>>8;
+ register unsigned int xalpha=xpos&0xFF;
+ uvbuf1[i]=(src1[xx]*(xalpha^255)+src1[xx+1]*xalpha);
+ uvbuf1[i+2048]=(src2[xx]*(xalpha^255)+src2[xx+1]*xalpha);
+ xpos+=s_xinc2;
+ }
+ }
+ if(!y0) continue;
+ }
+
+ // this loop should be rewritten in MMX assembly!!!!
+ // Note1: this code can be resticted to n*8 (or n*16) width lines to simplify optimization...
+ // Note2: instead of using lookup tabs, mmx version could do the multiply...
+ // Note3: maybe we should make separated 15/16, 24 and 32bpp version of this:
+ for(i=0;i<dstw;i++){
+ // vertical linear interpolation && yuv2rgb in a single step:
+ int Y=yuvtab_2568[((buf0[i]*yalpha1+buf1[i]*yalpha)>>16)];
+ int U=((uvbuf0[i]*uvalpha1+uvbuf1[i]*uvalpha)>>16);
+ int V=((uvbuf0[i+2048]*uvalpha1+uvbuf1[i+2048]*uvalpha)>>16);
+ dest[0]=clip_table[((Y + yuvtab_3343[U]) >>13)];
+ dest[1]=clip_table[((Y + yuvtab_0c92[V] + yuvtab_1a1e[U]) >>13)];
+ dest[2]=clip_table[((Y + yuvtab_40cf[V]) >>13)];
+ dest+=dstbpp;
+ }
+
+ }
+
+}
+
+
+void SwScale_Init(){
+ // generating tables:
+ int i;
+ for(i=0;i<256;i++){
+ clip_table[i]=0;
+ clip_table[i+256]=i;
+ clip_table[i+512]=255;
+ yuvtab_2568[i]=(0x2568*(i-16))+(256<<13);
+ yuvtab_3343[i]=0x3343*(i-128);
+ yuvtab_0c92[i]=-0x0c92*(i-128);
+ yuvtab_1a1e[i]=-0x1a1e*(i-128);
+ yuvtab_40cf[i]=0x40cf*(i-128);
+ }
+
+}
--
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