centralize and fixup example sources install targets

This follows suit with aeb036e in qtbase.

Change-Id: Ie8580d0a1f38ab9858b0e44c9f99bdc552a1752a
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: hjk <qthjk@ovi.com>

examples/multimedia/spectrum/3rdparty/fftreal/FFTRealFixLen.hpp

@@ -0,0 +1,322 @@
+/*****************************************************************************
+
+        FFTRealFixLen.hpp
+        Copyright (c) 2005 Laurent de Soras
+
+--- Legal stuff ---
+
+This library 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.
+
+This library 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 this library; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+*Tab=3***********************************************************************/
+
+
+
+#if defined (FFTRealFixLen_CURRENT_CODEHEADER)
+	#error Recursive inclusion of FFTRealFixLen code header.
+#endif
+#define	FFTRealFixLen_CURRENT_CODEHEADER
+
+#if ! defined (FFTRealFixLen_CODEHEADER_INCLUDED)
+#define	FFTRealFixLen_CODEHEADER_INCLUDED
+
+
+
+/*\\\ INCLUDE FILES \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
+
+#include	"def.h"
+#include	"FFTRealPassDirect.h"
+#include	"FFTRealPassInverse.h"
+#include	"FFTRealSelect.h"
+
+#include	<cassert>
+#include	<cmath>
+
+namespace std { }
+
+
+
+/*\\\ PUBLIC \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
+
+
+
+template <int LL2>
+FFTRealFixLen <LL2>::FFTRealFixLen ()
+:	_buffer (FFT_LEN)
+,	_br_data (BR_ARR_SIZE)
+,	_trigo_data (TRIGO_TABLE_ARR_SIZE)
+,	_trigo_osc ()
+{
+	build_br_lut ();
+	build_trigo_lut ();
+	build_trigo_osc ();
+}
+
+
+
+template <int LL2>
+long	FFTRealFixLen <LL2>::get_length () const
+{
+	return (FFT_LEN);
+}
+
+
+
+// General case
+template <int LL2>
+void	FFTRealFixLen <LL2>::do_fft (DataType f [], const DataType x [])
+{
+	assert (f != 0);
+	assert (x != 0);
+	assert (x != f);
+	assert (FFT_LEN_L2 >= 3);
+
+	// Do the transform in several passes
+	const DataType	*	cos_ptr = &_trigo_data [0];
+	const long *	br_ptr = &_br_data [0];
+
+	FFTRealPassDirect <FFT_LEN_L2 - 1>::process (
+		FFT_LEN,
+		f,
+		&_buffer [0],
+		x,
+		cos_ptr,
+		TRIGO_TABLE_ARR_SIZE,
+		br_ptr,
+		&_trigo_osc [0]
+	);
+}
+
+// 4-point FFT
+template <>
+void	FFTRealFixLen <2>::do_fft (DataType f [], const DataType x [])
+{
+	assert (f != 0);
+	assert (x != 0);
+	assert (x != f);
+
+	f [1] = x [0] - x [2];
+	f [3] = x [1] - x [3];
+
+	const DataType	b_0 = x [0] + x [2];
+	const DataType	b_2 = x [1] + x [3];
+	
+	f [0] = b_0 + b_2;
+	f [2] = b_0 - b_2;
+}
+
+// 2-point FFT
+template <>
+void	FFTRealFixLen <1>::do_fft (DataType f [], const DataType x [])
+{
+	assert (f != 0);
+	assert (x != 0);
+	assert (x != f);
+
+	f [0] = x [0] + x [1];
+	f [1] = x [0] - x [1];
+}
+
+// 1-point FFT
+template <>
+void	FFTRealFixLen <0>::do_fft (DataType f [], const DataType x [])
+{
+	assert (f != 0);
+	assert (x != 0);
+
+	f [0] = x [0];
+}
+
+
+
+// General case
+template <int LL2>
+void	FFTRealFixLen <LL2>::do_ifft (const DataType f [], DataType x [])
+{
+	assert (f != 0);
+	assert (x != 0);
+	assert (x != f);
+	assert (FFT_LEN_L2 >= 3);
+
+	// Do the transform in several passes
+	DataType *		s_ptr =
+		FFTRealSelect <FFT_LEN_L2 & 1>::sel_bin (&_buffer [0], x);
+	DataType *		d_ptr =
+		FFTRealSelect <FFT_LEN_L2 & 1>::sel_bin (x, &_buffer [0]);
+	const DataType	*	cos_ptr = &_trigo_data [0];
+	const long *	br_ptr = &_br_data [0];
+
+	FFTRealPassInverse <FFT_LEN_L2 - 1>::process (
+		FFT_LEN,
+		d_ptr,
+		s_ptr,
+		f,
+		cos_ptr,
+		TRIGO_TABLE_ARR_SIZE,
+		br_ptr,
+		&_trigo_osc [0]
+	);
+}
+
+// 4-point IFFT
+template <>
+void	FFTRealFixLen <2>::do_ifft (const DataType f [], DataType x [])
+{
+	assert (f != 0);
+	assert (x != 0);
+	assert (x != f);
+
+	const DataType	b_0 = f [0] + f [2];
+	const DataType	b_2 = f [0] - f [2];
+
+	x [0] = b_0 + f [1] * 2;
+	x [2] = b_0 - f [1] * 2;
+	x [1] = b_2 + f [3] * 2;
+	x [3] = b_2 - f [3] * 2;
+}
+
+// 2-point IFFT
+template <>
+void	FFTRealFixLen <1>::do_ifft (const DataType f [], DataType x [])
+{
+	assert (f != 0);
+	assert (x != 0);
+	assert (x != f);
+
+	x [0] = f [0] + f [1];
+	x [1] = f [0] - f [1];
+}
+
+// 1-point IFFT
+template <>
+void	FFTRealFixLen <0>::do_ifft (const DataType f [], DataType x [])
+{
+	assert (f != 0);
+	assert (x != 0);
+	assert (x != f);
+
+	x [0] = f [0];
+}
+
+
+
+
+template <int LL2>
+void	FFTRealFixLen <LL2>::rescale (DataType x []) const
+{
+	assert (x != 0);
+
+	const DataType	mul = DataType (1.0 / FFT_LEN);
+
+	if (FFT_LEN < 4)
+	{
+		long				i = FFT_LEN - 1;
+		do
+		{
+			x [i] *= mul;
+			--i;
+		}
+		while (i >= 0);
+	}
+
+	else
+	{
+		assert ((FFT_LEN & 3) == 0);
+
+		// Could be optimized with SIMD instruction sets (needs alignment check)
+		long				i = FFT_LEN - 4;
+		do
+		{
+			x [i + 0] *= mul;
+			x [i + 1] *= mul;
+			x [i + 2] *= mul;
+			x [i + 3] *= mul;
+			i -= 4;
+		}
+		while (i >= 0);
+	}
+}
+
+
+
+/*\\\ PROTECTED \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
+
+
+
+/*\\\ PRIVATE \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
+
+
+
+template <int LL2>
+void	FFTRealFixLen <LL2>::build_br_lut ()
+{
+	_br_data [0] = 0;
+	for (long cnt = 1; cnt < BR_ARR_SIZE; ++cnt)
+	{
+		long				index = cnt << 2;
+		long				br_index = 0;
+
+		int				bit_cnt = FFT_LEN_L2;
+		do
+		{
+			br_index <<= 1;
+			br_index += (index & 1);
+			index >>= 1;
+
+			-- bit_cnt;
+		}
+		while (bit_cnt > 0);
+
+		_br_data [cnt] = br_index;
+	}
+}
+
+
+
+template <int LL2>
+void	FFTRealFixLen <LL2>::build_trigo_lut ()
+{
+	const double	mul = (0.5 * PI) / TRIGO_TABLE_ARR_SIZE;
+	for (long i = 0; i < TRIGO_TABLE_ARR_SIZE; ++ i)
+	{
+		using namespace std;
+
+		_trigo_data [i] = DataType (cos (i * mul));
+	}
+}
+
+
+
+template <int LL2>
+void	FFTRealFixLen <LL2>::build_trigo_osc ()
+{
+	for (int i = 0; i < NBR_TRIGO_OSC; ++i)
+	{
+		OscType &		osc = _trigo_osc [i];
+
+		const long		len = static_cast <long> (TRIGO_TABLE_ARR_SIZE) << (i + 1);
+		const double	mul = (0.5 * PI) / len;
+		osc.set_step (mul);
+	}
+}
+
+
+
+#endif	// FFTRealFixLen_CODEHEADER_INCLUDED
+
+#undef FFTRealFixLen_CURRENT_CODEHEADER
+
+
+
+/*\\\ EOF \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/