2007-12-22 19:11:54 +00:00
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/*
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* resample.c
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* Copyright (C) 2004 Romain Dolbeau <romain@dolbeau.org>
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*
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* This file is part of a52dec, a free ATSC A-52 stream decoder.
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* See http://liba52.sourceforge.net/ for updates.
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*
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* File added for use with MPlayer and not part of original a52dec.
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*
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* a52dec 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 of the License, or
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* (at your option) any later version.
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*
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* a52dec 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 this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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2004-01-25 18:29:11 +00:00
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2007-12-11 20:16:00 +00:00
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#ifdef HAVE_ALTIVEC_H
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2004-01-25 18:29:11 +00:00
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#include <altivec.h>
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#endif
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const vector signed int magic = {0x43c00000,0x43c00000,0x43c00000,0x43c00000};
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static inline vector signed short convert16_altivec(vector signed int v1, vector signed int v2)
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{
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register vector signed short result;
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v1 = vec_subs(v1, magic);
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v2 = vec_subs(v2, magic);
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result = vec_packs(v1, v2);
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return result;
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}
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2007-11-11 20:58:02 +00:00
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static void unaligned_store(vector signed short value, int off, int16_t *dst)
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{
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register vector unsigned char align = vec_lvsr(0, dst),
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mask = vec_lvsl(0, dst);
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register vector signed short t0,t1, edges;
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t0 = vec_ld(0+off, dst);
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t1 = vec_ld(15+off, dst);
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edges = vec_perm(t1 ,t0, mask);
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t1 = vec_perm(value, edges, align);
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t0 = vec_perm(edges, value, align);
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vec_st(t1, 15+off, dst);
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vec_st(t0, 0+off, dst);
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}
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2004-01-25 18:29:11 +00:00
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static int a52_resample_STEREO_to_2_altivec(float * _f, int16_t * s16){
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#if 0
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int i;
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int32_t * f = (int32_t *) _f;
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for (i = 0; i < 256; i++) {
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s16[2*i] = convert (f[i]);
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s16[2*i+1] = convert (f[i+256]);
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}
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return 2*256;
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#else
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int i = 0;
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int32_t * f = (int32_t *) _f;
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register vector signed int f0, f4, f256, f260;
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register vector signed short reven, rodd, r0, r1;
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for (i = 0; i < 256; i+= 8) {
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f0 = vec_ld(0, f);
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f4 = vec_ld(16, f);
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f256 = vec_ld(1024, f);
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f260 = vec_ld(1040, f);
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reven = convert16_altivec(f0, f4);
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rodd = convert16_altivec(f256, f260);
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r0 = vec_mergeh(reven, rodd);
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r1 = vec_mergel(reven, rodd);
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2007-11-11 20:58:02 +00:00
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// FIXME can be merged to spare some I/O
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unaligned_store(r0, 0, s16);
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unaligned_store(r1, 16, s16);
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2004-01-25 18:29:11 +00:00
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f += 8;
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s16 += 16;
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}
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return(2*256);
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#endif
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}
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static void* a52_resample_altivec(int flags, int ch){
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fprintf(stderr, "Checking for AltiVec resampler : 0x%08x, %d\n", flags, ch);
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switch (flags) {
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case A52_CHANNEL:
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case A52_STEREO:
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case A52_DOLBY:
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if(ch==2) return a52_resample_STEREO_to_2_altivec;
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break;
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default:
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fprintf(stderr, "Unsupported flags: 0x%08x (%d channels)\n", flags, ch);
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break;
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}
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return NULL;
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}
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