blackfin optimized vp3 transform and infastructure for idct

Originally committed as revision 10667 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -426,10 +426,12 @@ OBJS-$(HAVE_ALTIVEC)                   += $(ALTIVEC-OBJS-yes)       \
 
 OBJS-$(ARCH_BFIN)                      += bfin/dsputil_bfin.o \
                                           bfin/mpegvideo_bfin.o \
+                                          bfin/vp3_bfin.o \
 
 ASM_OBJS-$(ARCH_BFIN)                  += bfin/pixels_bfin.o \
                                           bfin/fdct_bfin.o   \
                                           bfin/idct_bfin.o   \
+                                          bfin/vp3_idct_bfin.o   \
 
 EXTRALIBS := -L$(BUILD_ROOT)/libavutil -lavutil$(BUILDSUF) $(EXTRALIBS)
 

libavcodec/bfin/dsputil_bfin.c

@@ -31,6 +31,9 @@ int off;
 
 extern void ff_bfin_idct (DCTELEM *block) attribute_l1_text;
 extern void ff_bfin_fdct (DCTELEM *block) attribute_l1_text;
+extern void ff_bfin_vp3_idct (DCTELEM *block);
+extern void ff_bfin_vp3_idct_put (uint8_t *dest, int line_size, DCTELEM *block);
+extern void ff_bfin_vp3_idct_add (uint8_t *dest, int line_size, DCTELEM *block);
 extern void ff_bfin_add_pixels_clamped (DCTELEM *block, uint8_t *dest, int line_size) attribute_l1_text;
 extern void ff_bfin_put_pixels_clamped (DCTELEM *block, uint8_t *dest, int line_size) attribute_l1_text;
 extern void ff_bfin_diff_pixels (DCTELEM *block, uint8_t *s1, uint8_t *s2, int stride)  attribute_l1_text;
@@ -292,7 +295,11 @@ void dsputil_init_bfin( DSPContext* c, AVCodecContext *avctx )
 
     c->idct_permutation_type = FF_NO_IDCT_PERM;
     c->fdct                  = ff_bfin_fdct;
-    if (avctx->idct_algo!=FF_IDCT_VP3) {
+    if (avctx->idct_algo==FF_IDCT_VP3) {
+        c->idct               = ff_bfin_vp3_idct;
+        c->idct_add           = ff_bfin_vp3_idct_add;
+        c->idct_put           = ff_bfin_vp3_idct_put;
+    } else {
         c->idct               = ff_bfin_idct;
         c->idct_add           = bfin_idct_add;
         c->idct_put           = bfin_idct_put;

libavcodec/bfin/vp3_bfin.c

+/*
+ * This file is part of FFmpeg.
+ * Copyright (C) 2007 Marc Hoffman <marc.hoffman@analog.com>
+ *
+ * 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 "avcodec.h"
+#include "dsputil.h"
+#include "dsputil_bfin.h"
+
+extern void ff_bfin_vp3_idct (DCTELEM *block) attribute_l1_text;
+extern void ff_bfin_idct (DCTELEM *block) attribute_l1_text;
+extern void ff_bfin_add_pixels_clamped (DCTELEM *block, uint8_t *dest, int line_size) attribute_l1_text;
+extern void ff_bfin_put_pixels_clamped (DCTELEM *block, uint8_t *dest, int line_size) attribute_l1_text;
+
+/* Intra iDCT offset 128 */
+void ff_bfin_vp3_idct_put (uint8_t *dest, int line_size, DCTELEM *block)
+{
+    uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
+    int i,j;
+
+    ff_bfin_vp3_idct (block);
+
+    for (i=0;i<8;i++)
+        for (j=0;j<8;j++)
+            dest[line_size*i+j]=cm[128+block[i*8+j]];
+}
+
+/* Inter iDCT */
+void ff_bfin_vp3_idct_add (uint8_t *dest, int line_size, DCTELEM *block)
+{
+    ff_bfin_vp3_idct (block);
+    ff_bfin_add_pixels_clamped (block, dest, line_size);
+}
+
+