Move bfin specific code to its subdir.

Originally committed as revision 29079 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale

2 files changed, 699 insertions, 0 deletions

diff --git a/libswscale/bfin/internal_bfin.S b/libswscale/bfin/internal_bfin.S
new file mode 100644
index 0000000000..fb7bda7e12
--- /dev/null
+++ b/libswscale/bfin/internal_bfin.S
@@ -0,0 +1,606 @@
+/*
+ * Copyright (C) 2007 Marc Hoffman <marc.hoffman@analog.com>
+ *                    April 20, 2007
+ *
+ * Blackfin video color space converter operations
+ * convert I420 YV12 to RGB in various formats
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+/*
+YUV420 to RGB565 conversion. This routine takes a YUV 420 planar macroblock
+and converts it to RGB565. R:5 bits, G:6 bits, B:5 bits.. packed into shorts.
+
+
+The following calculation is used for the conversion:
+
+  r = clipz((y-oy)*cy  + crv*(v-128))
+  g = clipz((y-oy)*cy  + cgv*(v-128) + cgu*(u-128))
+  b = clipz((y-oy)*cy  + cbu*(u-128))
+
+y,u,v are prescaled by a factor of 4 i.e. left-shifted to gain precision.
+
+
+New factorization to eliminate the truncation error which was
+occurring due to the byteop3p.
+
+
+1) Use the bytop16m to subtract quad bytes we use this in U8 this
+ then so the offsets need to be renormalized to 8bits.
+
+2) Scale operands up by a factor of 4 not 8 because Blackfin
+   multiplies include a shift.
+
+3) Compute into the accumulators cy*yx0, cy*yx1.
+
+4) Compute each of the linear equations:
+     r = clipz((y - oy) * cy  + crv * (v - 128))
+
+     g = clipz((y - oy) * cy  + cgv * (v - 128) + cgu * (u - 128))
+
+     b = clipz((y - oy) * cy  + cbu * (u - 128))
+
+   Reuse of the accumulators requires that we actually multiply
+   twice once with addition and the second time with a subtraction.
+
+   Because of this we need to compute the equations in the order R B
+   then G saving the writes for B in the case of 24/32 bit color
+   formats.
+
+   API: yuv2rgb_kind (uint8_t *Y, uint8_t *U, uint8_t *V, int *out,
+                      int dW, uint32_t *coeffs);
+
+       A          B
+       ---        ---
+       i2 = cb    i3 = cr
+       i1 = coeff i0 = y
+
+Where coeffs have the following layout in memory.
+
+uint32_t oy,oc,zero,cy,crv,rmask,cbu,bmask,cgu,cgv;
+
+coeffs is a pointer to oy.
+
+The {rgb} masks are only utilized by the 565 packing algorithm. Note the data
+replication is used to simplify the internal algorithms for the dual Mac
+architecture of BlackFin.
+
+All routines are exported with _ff_bfin_ as a symbol prefix.
+
+Rough performance gain compared against -O3:
+
+2779809/1484290 187.28%
+
+which translates to ~33c/pel to ~57c/pel for the reference vs 17.5
+c/pel for the optimized implementations. Not sure why there is such a
+huge variation on the reference codes on Blackfin I guess it must have
+to do with the memory system.
+*/
+
+#define mL3 .text
+#ifdef __FDPIC__
+#define mL1 .l1.text
+#else
+#define mL1 mL3
+#endif
+#define MEM mL1
+
+#define DEFUN(fname,where,interface) \
+        .section where;              \
+        .global _ff_bfin_ ## fname;  \
+        .type _ff_bfin_ ## fname, STT_FUNC; \
+        .align 8;                    \
+        _ff_bfin_ ## fname
+
+#define DEFUN_END(fname) \
+        .size _ff_bfin_ ## fname, . - _ff_bfin_ ## fname
+
+
+.text
+
+#define COEFF_LEN        11*4
+#define COEFF_REL_CY_OFF 4*4
+
+#define ARG_OUT   20
+#define ARG_W     24
+#define ARG_COEFF 28
+
+DEFUN(yuv2rgb565_line,MEM,
+   (uint8_t *Y, uint8_t *U, uint8_t *V, int *out, int dW, uint32_t *coeffs)):
+        link 0;
+        [--sp] = (r7:4);
+        p1 = [fp+ARG_OUT];
+        r3 = [fp+ARG_W];
+
+        i0 = r0;
+        i2 = r1;
+        i3 = r2;
+
+        r0 = [fp+ARG_COEFF];
+        i1 = r0;
+        b1 = i1;
+        l1 = COEFF_LEN;
+        m0 = COEFF_REL_CY_OFF;
+        p0 = r3;
+
+        r0   = [i0++];         // 2Y
+        r1.l = w[i2++];        // 2u
+        r1.h = w[i3++];        // 2v
+        p0 = p0>>2;
+
+        lsetup (.L0565, .L1565) lc0 = p0;
+
+        /*
+           uint32_t oy,oc,zero,cy,crv,rmask,cbu,bmask,cgu,cgv
+           r0 -- used to load 4ys
+           r1 -- used to load 2us,2vs
+           r4 -- y3,y2
+           r5 -- y1,y0
+           r6 -- u1,u0
+           r7 -- v1,v0
+        */
+                                                              r2=[i1++]; // oy
+.L0565:
+        /*
+        rrrrrrrr gggggggg bbbbbbbb
+         5432109876543210
+                    bbbbb >>3
+              gggggggg    <<3
+         rrrrrrrr         <<8
+         rrrrrggggggbbbbb
+        */
+        (r4,r5) = byteop16m (r1:0, r3:2)                   || r3=[i1++]; // oc
+        (r7,r6) = byteop16m (r1:0, r3:2) (r);
+        r5 = r5 << 2 (v);                                                // y1,y0
+        r4 = r4 << 2 (v);                                                // y3,y2
+        r6 = r6 << 2 (v)                                   || r0=[i1++]; // u1,u0, r0=zero
+        r7 = r7 << 2 (v)                                   || r1=[i1++]; // v1,v0  r1=cy
+        /* Y' = y*cy */
+        a1 = r1.h*r5.h, a0 = r1.l*r5.l                     || r1=[i1++]; // crv
+
+        /* R = Y+ crv*(Cr-128) */
+        r2.h = (a1 += r1.h*r7.l), r2.l = (a0 += r1.l*r7.l);
+                a1 -= r1.h*r7.l,          a0 -= r1.l*r7.l  || r5=[i1++]; // rmask
+        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cbu
+        r2 = r2 >> 3 (v);
+        r3 = r2 & r5;
+
+        /* B = Y+ cbu*(Cb-128) */
+        r2.h = (a1 += r1.h*r6.l), r2.l = (a0 += r1.l*r6.l);
+                a1 -= r1.h*r6.l,          a0 -= r1.l*r6.l  || r5=[i1++]; // bmask
+        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cgu
+        r2 = r2 << 8 (v);
+        r2 = r2 & r5;
+        r3 = r3 | r2;
+
+        /* G = Y+ cgu*(Cb-128)+cgv*(Cr-128) */
+                a1 += r1.h*r6.l,          a0 += r1.l*r6.l  || r1=[i1++]; // cgv
+        r2.h = (a1 += r1.h*r7.l), r2.l = (a0 += r1.l*r7.l);
+        r2 = byteop3p(r3:2, r1:0)(LO)                      || r5=[i1++m0]; // gmask
+        r2 = r2 << 3 (v);
+        r2 = r2 & r5;
+        r3 = r3 | r2;
+        [p1++]=r3                                          || r1=[i1++]; // cy
+
+        /* Y' = y*cy */
+
+        a1 = r1.h*r4.h, a0 = r1.l*r4.l                     || r1=[i1++]; // crv
+
+        /* R = Y+ crv*(Cr-128) */
+        r2.h = (a1 += r1.h*r7.h), r2.l = (a0 += r1.l*r7.h);
+                a1 -= r1.h*r7.h,          a0 -= r1.l*r7.h  || r5=[i1++]; // rmask
+        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cbu
+        r2 = r2 >> 3 (v);
+        r3 = r2 & r5;
+
+        /* B = Y+ cbu*(Cb-128) */
+        r2.h = (a1 += r1.h*r6.h), r2.l = (a0 += r1.l*r6.h);
+                a1 -= r1.h*r6.h,          a0 -= r1.l*r6.h  || r5=[i1++]; // bmask
+        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cgu
+        r2 = r2 << 8 (v);
+        r2 = r2 & r5;
+        r3 = r3 | r2;
+
+        /* G = Y+ cgu*(Cb-128)+cgv*(Cr-128) */
+                a1 += r1.h*r6.h,          a0 += r1.l*r6.h  || r1=[i1++]; // cgv
+        r2.h = (a1 += r1.h*r7.h), r2.l = (a0 += r1.l*r7.h) || r5=[i1++]; // gmask
+        r2 = byteop3p(r3:2, r1:0)(LO)                      || r0   =  [i0++];        // 2Y
+        r2 = r2 << 3 (v)                                   || r1.l = w[i2++];        // 2u
+        r2 = r2 & r5;
+        r3 = r3 | r2;
+        [p1++]=r3                                          || r1.h = w[i3++];        // 2v
+.L1565:                                                       r2=[i1++]; // oy
+
+        l1 = 0;
+
+        (r7:4) = [sp++];
+        unlink;
+        rts;
+DEFUN_END(yuv2rgb565_line)
+
+DEFUN(yuv2rgb555_line,MEM,
+   (uint8_t *Y, uint8_t *U, uint8_t *V, int *out, int dW, uint32_t *coeffs)):
+        link 0;
+        [--sp] = (r7:4);
+        p1 = [fp+ARG_OUT];
+        r3 = [fp+ARG_W];
+
+        i0 = r0;
+        i2 = r1;
+        i3 = r2;
+
+        r0 = [fp+ARG_COEFF];
+        i1 = r0;
+        b1 = i1;
+        l1 = COEFF_LEN;
+        m0 = COEFF_REL_CY_OFF;
+        p0 = r3;
+
+        r0   = [i0++];         // 2Y
+        r1.l = w[i2++];        // 2u
+        r1.h = w[i3++];        // 2v
+        p0 = p0>>2;
+
+        lsetup (.L0555, .L1555) lc0 = p0;
+
+        /*
+           uint32_t oy,oc,zero,cy,crv,rmask,cbu,bmask,cgu,cgv
+           r0 -- used to load 4ys
+           r1 -- used to load 2us,2vs
+           r4 -- y3,y2
+           r5 -- y1,y0
+           r6 -- u1,u0
+           r7 -- v1,v0
+        */
+                                                              r2=[i1++]; // oy
+.L0555:
+        /*
+        rrrrrrrr gggggggg bbbbbbbb
+         5432109876543210
+                    bbbbb >>3
+               gggggggg   <<2
+          rrrrrrrr        <<7
+         xrrrrrgggggbbbbb
+        */
+
+        (r4,r5) = byteop16m (r1:0, r3:2)                   || r3=[i1++]; // oc
+        (r7,r6) = byteop16m (r1:0, r3:2) (r);
+        r5 = r5 << 2 (v);                                                // y1,y0
+        r4 = r4 << 2 (v);                                                // y3,y2
+        r6 = r6 << 2 (v)                                   || r0=[i1++]; // u1,u0, r0=zero
+        r7 = r7 << 2 (v)                                   || r1=[i1++]; // v1,v0  r1=cy
+        /* Y' = y*cy */
+        a1 = r1.h*r5.h, a0 = r1.l*r5.l                     || r1=[i1++]; // crv
+
+        /* R = Y+ crv*(Cr-128) */
+        r2.h = (a1 += r1.h*r7.l), r2.l = (a0 += r1.l*r7.l);
+                a1 -= r1.h*r7.l,          a0 -= r1.l*r7.l  || r5=[i1++]; // rmask
+        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cbu
+        r2 = r2 >> 3 (v);
+        r3 = r2 & r5;
+
+        /* B = Y+ cbu*(Cb-128) */
+        r2.h = (a1 += r1.h*r6.l), r2.l = (a0 += r1.l*r6.l);
+                a1 -= r1.h*r6.l,          a0 -= r1.l*r6.l  || r5=[i1++]; // bmask
+        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cgu
+        r2 = r2 << 7 (v);
+        r2 = r2 & r5;
+        r3 = r3 | r2;
+
+        /* G = Y+ cgu*(Cb-128)+cgv*(Cr-128) */
+                a1 += r1.h*r6.l,          a0 += r1.l*r6.l  || r1=[i1++]; // cgv
+        r2.h = (a1 += r1.h*r7.l), r2.l = (a0 += r1.l*r7.l);
+        r2 = byteop3p(r3:2, r1:0)(LO)                      || r5=[i1++m0]; // gmask
+        r2 = r2 << 2 (v);
+        r2 = r2 & r5;
+        r3 = r3 | r2;
+        [p1++]=r3                                          || r1=[i1++]; // cy
+
+        /* Y' = y*cy */
+
+        a1 = r1.h*r4.h, a0 = r1.l*r4.l                     || r1=[i1++]; // crv
+
+        /* R = Y+ crv*(Cr-128) */
+        r2.h = (a1 += r1.h*r7.h), r2.l = (a0 += r1.l*r7.h);
+                a1 -= r1.h*r7.h,          a0 -= r1.l*r7.h  || r5=[i1++]; // rmask
+        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cbu
+        r2 = r2 >> 3 (v);
+        r3 = r2 & r5;
+
+        /* B = Y+ cbu*(Cb-128) */
+        r2.h = (a1 += r1.h*r6.h), r2.l = (a0 += r1.l*r6.h);
+                a1 -= r1.h*r6.h,          a0 -= r1.l*r6.h  || r5=[i1++]; // bmask
+        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cgu
+        r2 = r2 << 7 (v);
+        r2 = r2 & r5;
+        r3 = r3 | r2;
+
+        /* G = Y+ cgu*(Cb-128)+cgv*(Cr-128) */
+                a1 += r1.h*r6.h,          a0 += r1.l*r6.h  || r1=[i1++]; // cgv
+        r2.h = (a1 += r1.h*r7.h), r2.l = (a0 += r1.l*r7.h) || r5=[i1++]; // gmask
+        r2 = byteop3p(r3:2, r1:0)(LO)                      || r0=[i0++];     // 4Y
+        r2 = r2 << 2 (v)                                   || r1.l=w[i2++];  // 2u
+        r2 = r2 & r5;
+        r3 = r3 | r2;
+        [p1++]=r3                                          || r1.h=w[i3++]; // 2v
+
+.L1555:                                                       r2=[i1++]; // oy
+
+        l1 = 0;
+
+        (r7:4) = [sp++];
+        unlink;
+        rts;
+DEFUN_END(yuv2rgb555_line)
+
+DEFUN(yuv2rgb24_line,MEM,
+   (uint8_t *Y, uint8_t *U, uint8_t *V, int *out, int dW, uint32_t *coeffs)):
+        link 0;
+        [--sp] = (r7:4);
+        p1 = [fp+ARG_OUT];
+        r3 = [fp+ARG_W];
+        p2 = p1;
+        p2 += 3;
+
+        i0 = r0;
+        i2 = r1;
+        i3 = r2;
+
+        r0 = [fp+ARG_COEFF]; // coeff buffer
+        i1 = r0;
+        b1 = i1;
+        l1 = COEFF_LEN;
+        m0 = COEFF_REL_CY_OFF;
+        p0 = r3;
+
+        r0   = [i0++];         // 2Y
+        r1.l = w[i2++];        // 2u
+        r1.h = w[i3++];        // 2v
+        p0 = p0>>2;
+
+        lsetup (.L0888, .L1888) lc0 = p0;
+
+        /*
+           uint32_t oy,oc,zero,cy,crv,rmask,cbu,bmask,cgu,cgv
+           r0 -- used to load 4ys
+           r1 -- used to load 2us,2vs
+           r4 -- y3,y2
+           r5 -- y1,y0
+           r6 -- u1,u0
+           r7 -- v1,v0
+        */
+                                                              r2=[i1++]; // oy
+.L0888:
+        (r4,r5) = byteop16m (r1:0, r3:2)                   || r3=[i1++]; // oc
+        (r7,r6) = byteop16m (r1:0, r3:2) (r);
+        r5 = r5 << 2 (v);               // y1,y0
+        r4 = r4 << 2 (v);               // y3,y2
+        r6 = r6 << 2 (v) || r0=[i1++];  // u1,u0, r0=zero
+        r7 = r7 << 2 (v) || r1=[i1++];  // v1,v0  r1=cy
+
+        /* Y' = y*cy */
+        a1 = r1.h*r5.h, a0 = r1.l*r5.l                     || r1=[i1++]; // crv
+
+        /* R = Y+ crv*(Cr-128) */
+        r2.h = (a1 += r1.h*r7.l), r2.l = (a0 += r1.l*r7.l);
+                a1 -= r1.h*r7.l,          a0 -= r1.l*r7.l  || r5=[i1++]; // rmask
+        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cbu
+        r2=r2>>16 || B[p1++]=r2;
+                     B[p2++]=r2;
+
+        /* B = Y+ cbu*(Cb-128) */
+        r2.h = (a1 += r1.h*r6.l), r2.l = (a0 += r1.l*r6.l);
+                a1 -= r1.h*r6.l,          a0 -= r1.l*r6.l  || r5=[i1++]; // bmask
+        r3 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cgu
+
+        /* G = Y+ cgu*(Cb-128)+cgv*(Cr-128) */
+                a1 += r1.h*r6.l,          a0 += r1.l*r6.l  || r1=[i1++]; // cgv
+        r2.h = (a1 += r1.h*r7.l), r2.l = (a0 += r1.l*r7.l);
+        r2 = byteop3p(r3:2, r1:0)(LO)                      || r5=[i1++m0]; // gmask, oy,cy,zero
+
+        r2=r2>>16 || B[p1++]=r2;
+                     B[p2++]=r2;
+
+        r3=r3>>16 || B[p1++]=r3;
+                     B[p2++]=r3                            || r1=[i1++]; // cy
+
+        p1+=3;
+        p2+=3;
+        /* Y' = y*cy */
+        a1 = r1.h*r4.h, a0 = r1.l*r4.l                     || r1=[i1++]; // crv
+
+        /* R = Y+ crv*(Cr-128) */
+        r2.h = (a1 += r1.h*r7.h), r2.l = (a0 += r1.l*r7.h);
+                a1 -= r1.h*r7.h,          a0 -= r1.l*r7.h  || r5=[i1++]; // rmask
+        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cbu
+        r2=r2>>16 || B[p1++]=r2;
+        B[p2++]=r2;
+
+        /* B = Y+ cbu*(Cb-128) */
+        r2.h = (a1 += r1.h*r6.h), r2.l = (a0 += r1.l*r6.h);
+                a1 -= r1.h*r6.h,          a0 -= r1.l*r6.h  || r5=[i1++]; // bmask
+        r3 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cgu
+
+        /* G = Y+ cgu*(Cb-128)+cgv*(Cr-128) */
+                a1 += r1.h*r6.h,          a0 += r1.l*r6.h  || r1=[i1++]; // cgv
+        r2.h = (a1 += r1.h*r7.h), r2.l = (a0 += r1.l*r7.h);
+        r2 = byteop3p(r3:2, r1:0)(LO)                      || r5=[i1++]; // gmask
+        r2=r2>>16 || B[p1++]=r2 || r0 = [i0++];    // 4y
+                     B[p2++]=r2 || r1.l = w[i2++]; // 2u
+        r3=r3>>16 || B[p1++]=r3 || r1.h = w[i3++]; // 2v
+                     B[p2++]=r3 || r2=[i1++];      // oy
+
+        p1+=3;
+.L1888: p2+=3;
+
+        l1 = 0;
+
+        (r7:4) = [sp++];
+        unlink;
+        rts;
+DEFUN_END(yuv2rgb24_line)
+
+
+
+#define ARG_vdst        20
+#define ARG_width       24
+#define ARG_height      28
+#define ARG_lumStride   32
+#define ARG_chromStride 36
+#define ARG_srcStride   40
+
+DEFUN(uyvytoyv12, mL3,  (const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
+                         long width, long height,
+                         long lumStride, long chromStride, long srcStride)):
+        link 0;
+        [--sp] = (r7:4,p5:4);
+
+        p0 = r1;       // Y top even
+
+        i2 = r2; // *u
+        r2 = [fp + ARG_vdst];
+        i3 = r2; // *v
+
+        r1 = [fp + ARG_srcStride];
+        r2 = r0 + r1;
+        r1 += -8;  // i0,i1 is pre read need to correct
+        m0 = r1;
+
+        i0 = r0;  // uyvy_T even
+        i1 = r2;  // uyvy_B odd
+
+        p2 = [fp + ARG_lumStride];
+        p1 = p0 + p2;  // Y bot odd
+
+        p5 = [fp + ARG_width];
+        p4 = [fp + ARG_height];
+        r0 = p5;
+        p4 = p4 >> 1;
+        p5 = p5 >> 2;
+
+        r2 = [fp + ARG_chromStride];
+        r0 = r0 >> 1;
+        r2 = r2 - r0;
+        m1 = r2;
+
+        /*   I0,I1 - src input line pointers
+         *   p0,p1 - luma output line pointers
+         *   I2    - dstU
+         *   I3    - dstV
+         */
+
+        lsetup (0f, 1f) lc1 = p4;   // H/2
+0:        r0 = [i0++] || r2 = [i1++];
+          r1 = [i0++] || r3 = [i1++];
+          r4 = byteop1p(r1:0, r3:2);
+          r5 = byteop1p(r1:0, r3:2) (r);
+          lsetup (2f, 3f) lc0 = p5; // W/4
+2:          r0 = r0 >> 8(v);
+            r1 = r1 >> 8(v);
+            r2 = r2 >> 8(v);
+            r3 = r3 >> 8(v);
+            r0 = bytepack(r0, r1);
+            r2 = bytepack(r2, r3)         ||  [p0++] = r0;    // yyyy
+            r6 = pack(r5.l, r4.l)         ||  [p1++] = r2;    // yyyy
+            r7 = pack(r5.h, r4.h)         ||  r0 = [i0++] || r2 = [i1++];
+            r6 = bytepack(r6, r7)         ||  r1 = [i0++] || r3 = [i1++];
+            r4 = byteop1p(r1:0, r3:2)     ||  w[i2++] = r6.l; // uu
+3:          r5 = byteop1p(r1:0, r3:2) (r) ||  w[i3++] = r6.h; // vv
+
+          i0 += m0;
+          i1 += m0;
+          i2 += m1;
+          i3 += m1;
+          p0 = p0 + p2;
+1:        p1 = p1 + p2;
+
+        (r7:4,p5:4) = [sp++];
+        unlink;
+        rts;
+DEFUN_END(uyvytoyv12)
+
+DEFUN(yuyvtoyv12, mL3,  (const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
+                         long width, long height,
+                         long lumStride, long chromStride, long srcStride)):
+        link 0;
+        [--sp] = (r7:4,p5:4);
+
+        p0 = r1;       // Y top even
+
+        i2 = r2; // *u
+        r2 = [fp + ARG_vdst];
+        i3 = r2; // *v
+
+        r1 = [fp + ARG_srcStride];
+        r2 = r0 + r1;
+        r1 += -8;  // i0,i1 is pre read need to correct
+        m0 = r1;
+
+        i0 = r0;  // uyvy_T even
+        i1 = r2;  // uyvy_B odd
+
+        p2 = [fp + ARG_lumStride];
+        p1 = p0 + p2;  // Y bot odd
+
+        p5 = [fp + ARG_width];
+        p4 = [fp + ARG_height];
+        r0 = p5;
+        p4 = p4 >> 1;
+        p5 = p5 >> 2;
+
+        r2 = [fp + ARG_chromStride];
+        r0 = r0 >> 1;
+        r2 = r2 - r0;
+        m1 = r2;
+
+        /*   I0,I1 - src input line pointers
+         *   p0,p1 - luma output line pointers
+         *   I2    - dstU
+         *   I3    - dstV
+         */
+
+        lsetup (0f, 1f) lc1 = p4;   // H/2
+0:        r0 = [i0++] || r2 = [i1++];
+          r1 = [i0++] || r3 = [i1++];
+          r4 = bytepack(r0, r1);
+          r5 = bytepack(r2, r3);
+          lsetup (2f, 3f) lc0 = p5; // W/4
+2:          r0 = r0 >> 8(v) || [p0++] = r4;  // yyyy-even
+            r1 = r1 >> 8(v) || [p1++] = r5;  // yyyy-odd
+            r2 = r2 >> 8(v);
+            r3 = r3 >> 8(v);
+            r4 = byteop1p(r1:0, r3:2);
+            r5 = byteop1p(r1:0, r3:2) (r);
+            r6 = pack(r5.l, r4.l);
+            r7 = pack(r5.h, r4.h)         ||  r0 = [i0++] || r2 = [i1++];
+            r6 = bytepack(r6, r7)         ||  r1 = [i0++] || r3 = [i1++];
+            r4 = bytepack(r0, r1)         ||  w[i2++] = r6.l; // uu
+3:          r5 = bytepack(r2, r3)         ||  w[i3++] = r6.h; // vv
+
+          i0 += m0;
+          i1 += m0;
+          i2 += m1;
+          i3 += m1;
+          p0 = p0 + p2;
+1:        p1 = p1 + p2;
+
+        (r7:4,p5:4) = [sp++];
+        unlink;
+        rts;
+DEFUN_END(yuyvtoyv12)
diff --git a/libswscale/bfin/swscale_bfin.c b/libswscale/bfin/swscale_bfin.c
new file mode 100644
index 0000000000..2ad81d847d
--- /dev/null
+++ b/libswscale/bfin/swscale_bfin.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2007 Marc Hoffman <marc.hoffman@analog.com>
+ *
+ * Blackfin software video scaler operations
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <inttypes.h>
+#include <assert.h>
+#include "config.h"
+#include <unistd.h>
+#include "libswscale/rgb2rgb.h"
+#include "libswscale/swscale.h"
+#include "libswscale/swscale_internal.h"
+
+#ifdef __FDPIC__
+#define L1CODE __attribute__ ((l1_text))
+#else
+#define L1CODE
+#endif
+
+int ff_bfin_uyvytoyv12(const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
+                       long width, long height,
+                       long lumStride, long chromStride, long srcStride) L1CODE;
+
+int ff_bfin_yuyvtoyv12(const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
+                       long width, long height,
+                       long lumStride, long chromStride, long srcStride) L1CODE;
+
+static int uyvytoyv12_unscaled(SwsContext *c, uint8_t* src[], int srcStride[], int srcSliceY,
+                               int srcSliceH, uint8_t* dst[], int dstStride[])
+{
+    uint8_t *dsty = dst[0] + dstStride[0]*srcSliceY;
+    uint8_t *dstu = dst[1] + dstStride[1]*srcSliceY/2;
+    uint8_t *dstv = dst[2] + dstStride[2]*srcSliceY/2;
+    uint8_t *ip   = src[0] + srcStride[0]*srcSliceY;
+    int w         = dstStride[0];
+
+    ff_bfin_uyvytoyv12(ip, dsty, dstu, dstv, w, srcSliceH,
+                       dstStride[0], dstStride[1], srcStride[0]);
+
+    return srcSliceH;
+}
+
+static int yuyvtoyv12_unscaled(SwsContext *c, uint8_t* src[], int srcStride[], int srcSliceY,
+                               int srcSliceH, uint8_t* dst[], int dstStride[])
+{
+    uint8_t *dsty = dst[0] + dstStride[0]*srcSliceY;
+    uint8_t *dstu = dst[1] + dstStride[1]*srcSliceY/2;
+    uint8_t *dstv = dst[2] + dstStride[2]*srcSliceY/2;
+    uint8_t *ip   = src[0] + srcStride[0]*srcSliceY;
+    int w         = dstStride[0];
+
+    ff_bfin_yuyvtoyv12(ip, dsty, dstu, dstv, w, srcSliceH,
+                       dstStride[0], dstStride[1], srcStride[0]);
+
+    return srcSliceH;
+}
+
+
+void ff_bfin_get_unscaled_swscale(SwsContext *c)
+{
+    SwsFunc swScale = c->swScale;
+    if (c->flags & SWS_CPU_CAPS_BFIN)
+        if (c->dstFormat == PIX_FMT_YUV420P)
+            if (c->srcFormat == PIX_FMT_UYVY422) {
+                av_log (NULL, AV_LOG_VERBOSE, "selecting Blackfin optimized uyvytoyv12_unscaled\n");
+                c->swScale = uyvytoyv12_unscaled;
+            }
+        if (c->dstFormat == PIX_FMT_YUV420P)
+            if (c->srcFormat == PIX_FMT_YUYV422) {
+                av_log (NULL, AV_LOG_VERBOSE, "selecting Blackfin optimized yuyvtoyv12_unscaled\n");
+                c->swScale = yuyvtoyv12_unscaled;
+            }
+}