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/*
* 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
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