mirror of https://github.com/VDR4Arch/vdr.git
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/*
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* imdct_kni.c
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*
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* Copyright (C) Aaron Holtzman - May 1999
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*
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* This file is part of ac3dec, a free Dolby AC-3 stream decoder.
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*
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* ac3dec is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* ac3dec is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Make; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*
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*/
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#ifdef __i386__
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#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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#include <mm_accel.h>
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#include "ac3.h"
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#include "ac3_internal.h"
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#include "downmix.h"
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#include "imdct_kni.h"
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#include "srfft.h"
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#define N 512
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/* Delay buffer for time domain interleaving */
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static float xcos_sin_sse[128 * 4] __attribute__((aligned(16)));
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extern void (*imdct_do_512) (float data[],float delay[]);
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extern void (*imdct_do_512_nol) (float data[], float delay[]);
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extern void (*fft_64p) (complex_t *);
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extern const int pm128[];
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extern float window[];
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extern complex_t buf[128];
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extern void fft_64p_kni (complex_t *);
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extern void fft_128p_kni (complex_t *);
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static void imdct_do_512_kni (float data[], float delay[]);
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static void imdct_do_512_nol_kni (float data[], float delay[]);
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int imdct_init_kni (void)
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{
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uint32_t accel = mm_accel ();
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if (accel & MM_ACCEL_X86_MMXEXT) {
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int i;
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float scale = 255.99609372;
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fprintf (stderr, "Using SSE for IMDCT\n");
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imdct_do_512 = imdct_do_512_kni;
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imdct_do_512_nol = imdct_do_512_nol_kni;
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fft_64p = fft_64p_kni;
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for (i=0; i < 128; i++) {
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float xcos_i = cos(2.0f * M_PI * (8*i+1)/(8*N)) * scale;
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float xsin_i = sin(2.0f * M_PI * (8*i+1)/(8*N)) * scale;
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xcos_sin_sse[i * 4] = xcos_i;
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xcos_sin_sse[i * 4 + 1] = -xsin_i;
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xcos_sin_sse[i * 4 + 2] = -xsin_i;
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xcos_sin_sse[i * 4 + 3] = -xcos_i;
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}
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return 0;
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} else
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return -1;
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}
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static void imdct_do_512_kni (float data[], float delay[])
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{
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imdct512_pre_ifft_twiddle_kni (pm128, buf, data, xcos_sin_sse);
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fft_128p_kni (buf);
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imdct512_post_ifft_twiddle_kni (buf, xcos_sin_sse);
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imdct512_window_delay_kni (buf, data, window, delay);
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}
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static void imdct_do_512_nol_kni (float data[], float delay[])
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{
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imdct512_pre_ifft_twiddle_kni (pm128, buf, data, xcos_sin_sse);
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fft_128p_kni (buf);
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imdct512_post_ifft_twiddle_kni (buf, xcos_sin_sse);
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imdct512_window_delay_nol_kni (buf, data, window, delay);
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}
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#endif
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