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>

5 files changed, 68 insertions, 13 deletions

diff --git a/libavcodec/arm/Makefile b/libavcodec/arm/Makefile
index b315d8da0e..ac486f47dc 100644
--- a/libavcodec/arm/Makefile
+++ b/libavcodec/arm/Makefile
@@ -30,6 +30,8 @@ OBJS-$(CONFIG_RV30_DECODER)            += arm/rv34dsp_init_arm.o
 OBJS-$(CONFIG_RV40_DECODER)            += arm/rv34dsp_init_arm.o        \
                                           arm/rv40dsp_init_arm.o        \
 
+OBJS-$(CONFIG_VIDEODSP)                += arm/videodsp_init_arm.o       \
+
 OBJS                                   += arm/dsputil_init_arm.o        \
                                           arm/dsputil_arm.o             \
                                           arm/fft_init_arm.o            \
@@ -41,6 +43,9 @@ OBJS                                   += arm/dsputil_init_arm.o        \
 ARMV5TE-OBJS-$(CONFIG_MPEGVIDEO)       += arm/mpegvideo_armv5te.o       \
                                           arm/mpegvideo_armv5te_s.o     \
 
+ARMV5TE-OBJS-$(CONFIG_VIDEODSP)        += arm/videodsp_init_armv5te.o   \
+                                          arm/videodsp_armv5te.o        \
+
 ARMV5TE-OBJS                           += arm/dsputil_init_armv5te.o    \
                                           arm/simple_idct_armv5te.o     \
 
diff --git a/libavcodec/arm/dsputil_arm.S b/libavcodec/arm/dsputil_arm.S
index ffb6eb4b50..8504032bf4 100644
--- a/libavcodec/arm/dsputil_arm.S
+++ b/libavcodec/arm/dsputil_arm.S
@@ -22,15 +22,7 @@
 #include "config.h"
 #include "libavutil/arm/asm.S"
 
-#if HAVE_ARMV5TE_EXTERNAL
-function ff_prefetch_arm, export=1
-        subs            r2,  r2,  #1
-        pld             [r0]
-        add             r0,  r0,  r1
-        bne             ff_prefetch_arm
-        bx              lr
-endfunc
-#else
+#if !HAVE_ARMV5TE_EXTERNAL
 #define pld @
 #endif
 
diff --git a/libavcodec/arm/dsputil_init_armv5te.c b/libavcodec/arm/dsputil_init_armv5te.c
index f37ffc3e9c..17017aa17d 100644
--- a/libavcodec/arm/dsputil_init_armv5te.c
+++ b/libavcodec/arm/dsputil_init_armv5te.c
@@ -25,8 +25,6 @@ void ff_simple_idct_armv5te(DCTELEM *data);
 void ff_simple_idct_put_armv5te(uint8_t *dest, int line_size, DCTELEM *data);
 void ff_simple_idct_add_armv5te(uint8_t *dest, int line_size, DCTELEM *data);
 
-void ff_prefetch_arm(void *mem, int stride, int h);
-
 av_cold void ff_dsputil_init_armv5te(DSPContext *c, AVCodecContext *avctx)
 {
     if (avctx->bits_per_raw_sample <= 8 &&
@@ -37,6 +35,4 @@ av_cold void ff_dsputil_init_armv5te(DSPContext *c, AVCodecContext *avctx)
         c->idct                  = ff_simple_idct_armv5te;
         c->idct_permutation_type = FF_NO_IDCT_PERM;
     }
-
-    c->prefetch = ff_prefetch_arm;
 }
diff --git a/libavcodec/arm/videodsp_armv5te.S b/libavcodec/arm/videodsp_armv5te.S
new file mode 100644
index 0000000000..96e92d5a73
--- /dev/null
+++ b/libavcodec/arm/videodsp_armv5te.S
@@ -0,0 +1,33 @@
+@
+@ ARMv5te optimized DSP utils
+@ Copyright (c) 2004 AGAWA Koji <i (AT) atty (DOT) jp>
+@
+@ 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 "config.h"
+#include "libavutil/arm/asm.S"
+
+#if HAVE_ARMV5TE_EXTERNAL
+function ff_prefetch_arm, export=1
+        subs            r2,  r2,  #1
+        pld             [r0]
+        add             r0,  r0,  r1
+        bne             ff_prefetch_arm
+        bx              lr
+endfunc
+#endif
diff --git a/libavcodec/arm/videodsp_init_arm.c b/libavcodec/arm/videodsp_init_arm.c
new file mode 100644
index 0000000000..6c97b2ce5e
--- /dev/null
+++ b/libavcodec/arm/videodsp_init_arm.c
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2012 Ronald S. Bultje
+ *
+ * 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 "libavutil/arm/cpu.h"
+#include "libavcodec/videodsp.h"
+#include "videodsp_arm.h"
+
+void ff_videodsp_init_arm(VideoDSPContext *ctx, int bpc)
+{
+    int cpu_flags = av_get_cpu_flags();
+    if (have_armv5te(cpu_flags)) ff_videodsp_init_armv5te(ctx, bpc);
+}