switch to walken's libac3 and minor bugfixes

CVS patchset: 83
CVS date: 2001/05/26 15:07:18

1 files changed, 143 insertions, 0 deletions

diff --git a/src/libac3/imdct_mlib.c b/src/libac3/imdct_mlib.c
new file mode 100644
index 000000000..eca0139ee
--- /dev/null
+++ b/src/libac3/imdct_mlib.c
@@ -0,0 +1,143 @@
+/* 
+ *  imdct_mlib.c
+ *  Copyright (C) 2001 Håkan Hjort <d95hjort@dtek.chalmers.se>
+ *
+ *  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. 
+ */
+
+
+#include "config.h"
+
+#ifdef LIBAC3_MLIB
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+
+#include <mlib_types.h>
+#include <mlib_status.h>
+#include <mlib_signal.h>
+
+
+extern float imdct_window[];
+
+void
+imdct_do_512_mlib(float data[], float delay[])
+{
+	float *buf_real;
+	float *buf_imag;
+	float *data_ptr;
+	float *delay_ptr;
+	float *window_ptr;
+	float tmp[256] __attribute__ ((__aligned__ (16)));
+	int i;
+	
+	memcpy(tmp, data, 256 * sizeof(float));
+	if(mlib_SignalIMDCT_F32(tmp) != MLIB_SUCCESS) {
+	  fprintf(stderr, "mediaLib failure\n");
+	  exit(-1);
+	}
+  
+	buf_real = tmp;
+	buf_imag = tmp + 128;
+	data_ptr = data;
+	delay_ptr = delay;
+	window_ptr = imdct_window;
+
+	/* Window and convert to real valued signal */
+	for(i=0; i< 64; i++) 
+	{ 
+		*data_ptr++ = 2.0f * (-buf_imag[64+i]   * *window_ptr++ + *delay_ptr++); 
+		*data_ptr++ = 2.0f * ( buf_real[64-i-1] * *window_ptr++ + *delay_ptr++); 
+	}
+
+	for(i=0; i< 64; i++) 
+	{ 
+		*data_ptr++ = 2.0f * (-buf_real[i]       * *window_ptr++ + *delay_ptr++); 
+		*data_ptr++ = 2.0f * ( buf_imag[128-i-1] * *window_ptr++ + *delay_ptr++); 
+	}
+	
+	/* The trailing edge of the window goes into the delay line */
+	delay_ptr = delay;
+
+	for(i=0; i< 64; i++) 
+	{ 
+		*delay_ptr++ = -buf_real[64+i]   * *--window_ptr; 
+		*delay_ptr++ =  buf_imag[64-i-1] * *--window_ptr; 
+	}
+
+	for(i=0; i<64; i++) 
+	{
+		*delay_ptr++ =  buf_imag[i]       * *--window_ptr; 
+		*delay_ptr++ = -buf_real[128-i-1] * *--window_ptr; 
+	}
+}
+
+void
+imdct_do_256_mlib(float data[], float delay[])
+{
+	float *buf1_real, *buf1_imag;
+	float *buf2_real, *buf2_imag;
+	float *data_ptr;
+	float *delay_ptr;
+	float *window_ptr;
+	float tmp[256] __attribute__ ((__aligned__ (16)));
+	int i;
+	
+	memcpy(tmp, data, 256 * sizeof(float));
+	if(mlib_SignalIMDCT_F32(tmp) != MLIB_SUCCESS) {
+	  fprintf(stderr, "mediaLib failure\n");
+	  exit(-1);
+	}
+  
+	buf1_real = tmp;
+	buf1_imag = tmp + 64;
+	buf2_real = tmp + 128;
+	buf2_imag = tmp + 128 + 64;
+	data_ptr = data;
+	delay_ptr = delay;
+	window_ptr = imdct_window;
+
+	/* Window and convert to real valued signal */
+	for(i=0; i< 64; i++) 
+	{
+		*data_ptr++ = 2.0f * (-buf1_imag[i]      * *window_ptr++ + *delay_ptr++);
+		*data_ptr++ = 2.0f * ( buf1_real[64-i-1] * *window_ptr++ + *delay_ptr++);
+	}
+
+	for(i=0; i< 64; i++) 
+	{
+		*data_ptr++ = 2.0f * (-buf1_real[i]      * *window_ptr++ + *delay_ptr++);
+		*data_ptr++ = 2.0f * ( buf1_imag[64-i-1] * *window_ptr++ + *delay_ptr++);
+	}
+	
+	delay_ptr = delay;
+
+	for(i=0; i< 64; i++) 
+	{
+		*delay_ptr++ = -buf2_real[i]      * *--window_ptr;
+		*delay_ptr++ =  buf2_imag[64-i-1] * *--window_ptr;
+	}
+
+	for(i=0; i< 64; i++) 
+	{
+		*delay_ptr++ =  buf2_imag[i]      * *--window_ptr;
+		*delay_ptr++ = -buf2_real[64-i-1] * *--window_ptr;
+	}
+}
+
+#endif