forked from KolibriOS/kolibrios
131 lines
4.2 KiB
C
131 lines
4.2 KiB
C
/*
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* Copyright (c) 2002 Dieter Shirley
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*
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* dct_unquantize_h263_altivec:
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* Copyright (c) 2003 Romain Dolbeau <romain@dolbeau.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include "config.h"
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#include "libavutil/attributes.h"
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#include "libavutil/cpu.h"
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#include "libavutil/ppc/types_altivec.h"
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#include "libavutil/ppc/util_altivec.h"
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#include "libavcodec/mpegvideo.h"
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#include "dsputil_altivec.h"
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#if HAVE_ALTIVEC
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/* AltiVec version of dct_unquantize_h263
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this code assumes `block' is 16 bytes-aligned */
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static void dct_unquantize_h263_altivec(MpegEncContext *s,
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int16_t *block, int n, int qscale)
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{
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int i, level, qmul, qadd;
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int nCoeffs;
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assert(s->block_last_index[n]>=0);
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qadd = (qscale - 1) | 1;
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qmul = qscale << 1;
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if (s->mb_intra) {
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if (!s->h263_aic) {
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if (n < 4)
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block[0] = block[0] * s->y_dc_scale;
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else
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block[0] = block[0] * s->c_dc_scale;
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}else
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qadd = 0;
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i = 1;
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nCoeffs= 63; //does not always use zigzag table
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} else {
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i = 0;
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nCoeffs= s->intra_scantable.raster_end[ s->block_last_index[n] ];
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}
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{
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register const vector signed short vczero = (const vector signed short)vec_splat_s16(0);
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DECLARE_ALIGNED(16, short, qmul8) = qmul;
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DECLARE_ALIGNED(16, short, qadd8) = qadd;
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register vector signed short blockv, qmulv, qaddv, nqaddv, temp1;
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register vector bool short blockv_null, blockv_neg;
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register short backup_0 = block[0];
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register int j = 0;
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qmulv = vec_splat((vec_s16)vec_lde(0, &qmul8), 0);
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qaddv = vec_splat((vec_s16)vec_lde(0, &qadd8), 0);
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nqaddv = vec_sub(vczero, qaddv);
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// vectorize all the 16 bytes-aligned blocks
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// of 8 elements
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for(; (j + 7) <= nCoeffs ; j+=8) {
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blockv = vec_ld(j << 1, block);
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blockv_neg = vec_cmplt(blockv, vczero);
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blockv_null = vec_cmpeq(blockv, vczero);
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// choose between +qadd or -qadd as the third operand
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temp1 = vec_sel(qaddv, nqaddv, blockv_neg);
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// multiply & add (block{i,i+7} * qmul [+-] qadd)
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temp1 = vec_mladd(blockv, qmulv, temp1);
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// put 0 where block[{i,i+7} used to have 0
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blockv = vec_sel(temp1, blockv, blockv_null);
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vec_st(blockv, j << 1, block);
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}
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// if nCoeffs isn't a multiple of 8, finish the job
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// using good old scalar units.
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// (we could do it using a truncated vector,
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// but I'm not sure it's worth the hassle)
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for(; j <= nCoeffs ; j++) {
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level = block[j];
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if (level) {
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if (level < 0) {
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level = level * qmul - qadd;
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} else {
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level = level * qmul + qadd;
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}
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block[j] = level;
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}
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}
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if (i == 1) {
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// cheat. this avoid special-casing the first iteration
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block[0] = backup_0;
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}
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}
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}
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#endif /* HAVE_ALTIVEC */
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av_cold void ff_MPV_common_init_ppc(MpegEncContext *s)
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{
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#if HAVE_ALTIVEC
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if (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC))
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return;
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if ((s->avctx->dct_algo == FF_DCT_AUTO) ||
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(s->avctx->dct_algo == FF_DCT_ALTIVEC)) {
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s->dct_unquantize_h263_intra = dct_unquantize_h263_altivec;
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s->dct_unquantize_h263_inter = dct_unquantize_h263_altivec;
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}
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#endif /* HAVE_ALTIVEC */
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}
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