Add x86-optimized versions of exponent_min().

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/libavcodec/x86/ac3dsp_mmx.c b/libavcodec/x86/ac3dsp_mmx.c
new file mode 100644
index 0000000000..7ce3aa358d
--- /dev/null
+++ b/libavcodec/x86/ac3dsp_mmx.c
@@ -0,0 +1,45 @@
+/*
+ * x86-optimized AC-3 DSP utils
+ * Copyright (c) 2011 Justin Ruggles
+ *
+ * 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 "libavutil/x86_cpu.h"
+#include "dsputil_mmx.h"
+#include "libavcodec/ac3dsp.h"
+
+extern void ff_ac3_exponent_min_mmx   (uint8_t *exp, int num_reuse_blocks, int nb_coefs);
+extern void ff_ac3_exponent_min_mmxext(uint8_t *exp, int num_reuse_blocks, int nb_coefs);
+extern void ff_ac3_exponent_min_sse2  (uint8_t *exp, int num_reuse_blocks, int nb_coefs);
+
+av_cold void ff_ac3dsp_init_x86(AC3DSPContext *c)
+{
+    int mm_flags = av_get_cpu_flags();
+
+#if HAVE_YASM
+    if (mm_flags & AV_CPU_FLAG_MMX) {
+        c->ac3_exponent_min = ff_ac3_exponent_min_mmx;
+    }
+    if (mm_flags & AV_CPU_FLAG_MMX2 && HAVE_MMX2) {
+        c->ac3_exponent_min = ff_ac3_exponent_min_mmxext;
+    }
+    if (mm_flags & AV_CPU_FLAG_SSE2 && HAVE_SSE) {
+        c->ac3_exponent_min = ff_ac3_exponent_min_sse2;
+    }
+#endif
+}