1 files changed, 103 insertions, 0 deletions
diff --git a/ac3dec/imdct_kni.c b/ac3dec/imdct_kni.c
new file mode 100644
index 00000000..b44547a9
--- /dev/null
+++ b/ac3dec/imdct_kni.c
@@ -0,0 +1,103 @@
+/* 
+ *  imdct_kni.c
+ *
+ *	Copyright (C) Aaron Holtzman - May 1999
+ *
+ *  This file is part of ac3dec, a free Dolby AC-3 stream decoder.
+ *	
+ *  ac3dec is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *   
+ *  ac3dec 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 General Public License for more details.
+ *   
+ *  You should have received a copy of the GNU General Public License
+ *  along with GNU Make; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
+ *
+ *
+ */
+
+#ifdef __i386__
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include <mm_accel.h>
+#include "ac3.h"
+#include "ac3_internal.h"
+
+#include "downmix.h"
+#include "imdct_kni.h"
+#include "srfft.h"
+
+#define N 512
+
+/* Delay buffer for time domain interleaving */
+static float xcos_sin_sse[128 * 4] __attribute__((aligned(16)));
+
+extern void (*imdct_do_512) (float data[],float delay[]);
+extern void (*imdct_do_512_nol) (float data[], float delay[]);
+extern void (*fft_64p) (complex_t *);
+
+extern const int pm128[];
+extern float window[];
+extern complex_t buf[128];
+
+extern void fft_64p_kni (complex_t *);
+extern void fft_128p_kni (complex_t *);
+
+static void imdct_do_512_kni (float data[], float delay[]);
+static void imdct_do_512_nol_kni (float data[], float delay[]);
+
+
+int imdct_init_kni (void)
+{
+	uint32_t accel = mm_accel ();
+
+	if (accel & MM_ACCEL_X86_MMXEXT) {
+		int i;
+		float scale = 255.99609372;
+
+		fprintf (stderr, "Using SSE for IMDCT\n");
+		imdct_do_512 = imdct_do_512_kni;
+		imdct_do_512_nol = imdct_do_512_nol_kni;
+		fft_64p = fft_64p_kni;
+
+		for (i=0; i < 128; i++) {
+			float xcos_i = cos(2.0f * M_PI * (8*i+1)/(8*N)) * scale;
+                       	float xsin_i = sin(2.0f * M_PI * (8*i+1)/(8*N)) * scale;
+                       	xcos_sin_sse[i * 4] = xcos_i;
+                       	xcos_sin_sse[i * 4 + 1] = -xsin_i;
+                       	xcos_sin_sse[i * 4 + 2] = -xsin_i;
+                       	xcos_sin_sse[i * 4 + 3] = -xcos_i;
+               	}
+
+		return 0;
+	} else
+		return -1;
+}
+
+
+static void imdct_do_512_kni (float data[], float delay[])
+{
+	imdct512_pre_ifft_twiddle_kni (pm128, buf, data, xcos_sin_sse);
+	fft_128p_kni (buf);
+	imdct512_post_ifft_twiddle_kni (buf, xcos_sin_sse);
+	imdct512_window_delay_kni (buf, data, window, delay);
+}
+
+
+static void imdct_do_512_nol_kni (float data[], float delay[])
+{
+	imdct512_pre_ifft_twiddle_kni (pm128, buf, data, xcos_sin_sse);  
+	fft_128p_kni (buf);
+	imdct512_post_ifft_twiddle_kni (buf, xcos_sin_sse);
+	imdct512_window_delay_nol_kni (buf, data, window, delay);
+}
+
+#endif