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/*
* resample.c
* Copyright (C) 2004 Romain Dolbeau <romain@dolbeau.org>
*
* This file is part of a52dec, a free ATSC A-52 stream decoder.
* See http://liba52.sourceforge.net/ for updates.
*
* File added for use with MPlayer and not part of original a52dec.
*
* a52dec 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 of the License, or
* (at your option) any later version.
*
* a52dec 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_ALTIVEC_H
#include <altivec.h>
#endif
const vector signed int magic = {0x43c00000,0x43c00000,0x43c00000,0x43c00000};
static inline vector signed short convert16_altivec(vector signed int v1, vector signed int v2)
{
register vector signed short result;
v1 = vec_subs(v1, magic);
v2 = vec_subs(v2, magic);
result = vec_packs(v1, v2);
return result;
}
static void unaligned_store(vector signed short value, int off, int16_t *dst)
{
register vector unsigned char align = vec_lvsr(0, dst),
mask = vec_lvsl(0, dst);
register vector signed short t0,t1, edges;
t0 = vec_ld(0+off, dst);
t1 = vec_ld(15+off, dst);
edges = vec_perm(t1 ,t0, mask);
t1 = vec_perm(value, edges, align);
t0 = vec_perm(edges, value, align);
vec_st(t1, 15+off, dst);
vec_st(t0, 0+off, dst);
}
static int a52_resample_STEREO_to_2_altivec(float * _f, int16_t * s16){
#if 0
int i;
int32_t * f = (int32_t *) _f;
for (i = 0; i < 256; i++) {
s16[2*i] = convert (f[i]);
s16[2*i+1] = convert (f[i+256]);
}
return 2*256;
#else
int i = 0;
int32_t * f = (int32_t *) _f;
register vector signed int f0, f4, f256, f260;
register vector signed short reven, rodd, r0, r1;
for (i = 0; i < 256; i+= 8) {
f0 = vec_ld(0, f);
f4 = vec_ld(16, f);
f256 = vec_ld(1024, f);
f260 = vec_ld(1040, f);
reven = convert16_altivec(f0, f4);
rodd = convert16_altivec(f256, f260);
r0 = vec_mergeh(reven, rodd);
r1 = vec_mergel(reven, rodd);
// FIXME can be merged to spare some I/O
unaligned_store(r0, 0, s16);
unaligned_store(r1, 16, s16);
f += 8;
s16 += 16;
}
return(2*256);
#endif
}
static void* a52_resample_altivec(int flags, int ch){
fprintf(stderr, "Checking for AltiVec resampler : 0x%08x, %d\n", flags, ch);
switch (flags) {
case A52_CHANNEL:
case A52_STEREO:
case A52_DOLBY:
if(ch==2) return a52_resample_STEREO_to_2_altivec;
break;
default:
fprintf(stderr, "Unsupported flags: 0x%08x (%d channels)\n", flags, ch);
break;
}
return NULL;
}
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