1 files changed, 51 insertions, 0 deletions
diff --git a/libavcodec/x86/mdct_init.c b/libavcodec/x86/mdct_init.c
new file mode 100644
index 0000000000..db642d863d
--- /dev/null
+++ b/libavcodec/x86/mdct_init.c
@@ -0,0 +1,51 @@
+/*
+ * 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/attributes.h"
+#include "libavutil/cpu.h"
+#include "libavutil/x86/cpu.h"
+
+#include "mdct.h"
+
+av_cold void ff_mdct_init_x86(FFTContext *s)
+{
+    int cpu_flags = av_get_cpu_flags();
+
+#if ARCH_X86_32
+    if (EXTERNAL_AMD3DNOW(cpu_flags)) {
+        s->imdct_calc = ff_imdct_calc_3dnow;
+        s->imdct_half = ff_imdct_half_3dnow;
+    }
+
+    if (EXTERNAL_AMD3DNOWEXT(cpu_flags)) {
+        s->imdct_calc = ff_imdct_calc_3dnowext;
+        s->imdct_half = ff_imdct_half_3dnowext;
+    }
+#endif /* ARCH_X86_32 */
+
+    if (EXTERNAL_SSE(cpu_flags)) {
+        s->imdct_calc  = ff_imdct_calc_sse;
+        s->imdct_half  = ff_imdct_half_sse;
+    }
+
+    if (EXTERNAL_AVX_FAST(cpu_flags) && s->nbits >= 5) {
+        s->imdct_half      = ff_imdct_half_avx;
+    }
+}