adding Blackfin swscale_bfin infrastructure, and the first swscale routine uyvy to yv12 video resampler

Originally committed as revision 23604 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale

libswscale/swscale_bfin.c

@@ -0,0 +1,66 @@
+/*
+ * 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"
+#ifdef HAVE_MALLOC_H
+#include <malloc.h>
+#endif
+#include <unistd.h>
+#include "rgb2rgb.h"
+#include "swscale.h"
+#include "swscale_internal.h"
+
+
+extern 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) __attribute__ ((l1_text));
+
+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;
+}
+
+
+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;
+            }
+}