lavc: introduce VideoDSPContext

Move some functions from dsputil. The idea is that videodsp contains
functions that are useful for a large and varied set of video decoders.
Currently, it contains emulated_edge_mc() and prefetch().

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/libavcodec/ppc/videodsp_ppc.c b/libavcodec/ppc/videodsp_ppc.c
new file mode 100644
index 0000000000..1865b198b0
--- /dev/null
+++ b/libavcodec/ppc/videodsp_ppc.c
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2003-2004 Romain Dolbeau
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavcodec/videodsp.h"
+
+static void prefetch_ppc(uint8_t *mem, ptrdiff_t stride, int h)
+{
+    register const uint8_t *p = mem;
+    do {
+        __asm__ volatile ("dcbt 0,%0" : : "r" (p));
+        p += stride;
+    } while(--h);
+}
+
+void ff_videodsp_init_ppc(VideoDSPContext *ctx, int bpc)
+{
+    ctx->prefetch = prefetch_ppc;
+}