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authorRonald S. Bultje <rsbultje@gmail.com>2012-12-15 09:46:02 -0800
committerLuca Barbato <lu_zero@gentoo.org>2012-12-20 13:40:45 +0100
commit8c53d39e7f0604127bfc96fa1182c8abe3847ac6 (patch)
tree18495cabf7f0e6d365871d3407f2534f2b80b653 /libavcodec/x86/videodsp_init.c
parenta925f723a915bc0255e2673f8817af5212131763 (diff)
downloadffmpeg-8c53d39e7f0604127bfc96fa1182c8abe3847ac6.tar.gz
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>
Diffstat (limited to 'libavcodec/x86/videodsp_init.c')
-rw-r--r--libavcodec/x86/videodsp_init.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/libavcodec/x86/videodsp_init.c b/libavcodec/x86/videodsp_init.c
new file mode 100644
index 0000000000..07a0324c69
--- /dev/null
+++ b/libavcodec/x86/videodsp_init.c
@@ -0,0 +1,119 @@
+/*
+ * 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 "config.h"
+#include "libavutil/common.h"
+#include "libavutil/cpu.h"
+#include "libavutil/mem.h"
+#include "libavutil/x86/asm.h"
+#include "libavcodec/videodsp.h"
+
+#if HAVE_YASM
+typedef void emu_edge_core_func(uint8_t *buf, const uint8_t *src,
+ x86_reg linesize, x86_reg start_y,
+ x86_reg end_y, x86_reg block_h,
+ x86_reg start_x, x86_reg end_x,
+ x86_reg block_w);
+extern emu_edge_core_func ff_emu_edge_core_mmx;
+extern emu_edge_core_func ff_emu_edge_core_sse;
+
+static av_always_inline void emulated_edge_mc(uint8_t *buf, const uint8_t *src,
+ ptrdiff_t linesize,
+ int block_w, int block_h,
+ int src_x, int src_y,
+ int w, int h,
+ emu_edge_core_func *core_fn)
+{
+ int start_y, start_x, end_y, end_x, src_y_add = 0;
+
+ if (src_y >= h) {
+ src_y_add = h - 1 - src_y;
+ src_y = h - 1;
+ } else if (src_y <= -block_h) {
+ src_y_add = 1 - block_h - src_y;
+ src_y = 1 - block_h;
+ }
+ if (src_x >= w) {
+ src += w - 1 - src_x;
+ src_x = w - 1;
+ } else if (src_x <= -block_w) {
+ src += 1 - block_w - src_x;
+ src_x = 1 - block_w;
+ }
+
+ start_y = FFMAX(0, -src_y);
+ start_x = FFMAX(0, -src_x);
+ end_y = FFMIN(block_h, h-src_y);
+ end_x = FFMIN(block_w, w-src_x);
+ assert(start_x < end_x && block_w > 0);
+ assert(start_y < end_y && block_h > 0);
+
+ // fill in the to-be-copied part plus all above/below
+ src += (src_y_add + start_y) * linesize + start_x;
+ buf += start_x;
+ core_fn(buf, src, linesize, start_y, end_y,
+ block_h, start_x, end_x, block_w);
+}
+
+#if ARCH_X86_32
+static av_noinline void emulated_edge_mc_mmx(uint8_t *buf, const uint8_t *src,
+ ptrdiff_t linesize,
+ int block_w, int block_h,
+ int src_x, int src_y, int w, int h)
+{
+ emulated_edge_mc(buf, src, linesize, block_w, block_h, src_x, src_y,
+ w, h, &ff_emu_edge_core_mmx);
+}
+#endif
+
+static av_noinline void emulated_edge_mc_sse(uint8_t *buf, const uint8_t *src,
+ ptrdiff_t linesize,
+ int block_w, int block_h,
+ int src_x, int src_y, int w, int h)
+{
+ emulated_edge_mc(buf, src, linesize, block_w, block_h, src_x, src_y,
+ w, h, &ff_emu_edge_core_sse);
+}
+#endif /* HAVE_YASM */
+
+void ff_prefetch_mmxext(uint8_t *buf, ptrdiff_t stride, int h);
+void ff_prefetch_3dnow(uint8_t *buf, ptrdiff_t stride, int h);
+
+void ff_videodsp_init_x86(VideoDSPContext *ctx, int bpc)
+{
+#if HAVE_YASM
+ int mm_flags = av_get_cpu_flags();
+
+#if ARCH_X86_32
+ if (bpc <= 8 && mm_flags & AV_CPU_FLAG_MMX) {
+ ctx->emulated_edge_mc = emulated_edge_mc_mmx;
+ }
+ if (mm_flags & AV_CPU_FLAG_3DNOW) {
+ ctx->prefetch = ff_prefetch_3dnow;
+ }
+#endif /* ARCH_X86_32 */
+ if (mm_flags & AV_CPU_FLAG_MMXEXT) {
+ ctx->prefetch = ff_prefetch_mmxext;
+ }
+ if (bpc <= 8 && mm_flags & AV_CPU_FLAG_SSE) {
+ ctx->emulated_edge_mc = emulated_edge_mc_sse;
+ }
+#endif /* HAVE_YASM */
+}