/* * Copyright (c) 2002 Dieter Shirley * * dct_unquantize_h263_altivec: * Copyright (c) 2003 Romain Dolbeau <romain@dolbeau.org> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <stdlib.h> #include <stdio.h> #include "config.h" #include "libavutil/attributes.h" #include "libavutil/cpu.h" #include "libavutil/ppc/cpu.h" #include "libavutil/ppc/util_altivec.h" #include "libavcodec/mpegvideo.h" #if HAVE_ALTIVEC /* AltiVec version of dct_unquantize_h263 this code assumes `block' is 16 bytes-aligned */ static void dct_unquantize_h263_altivec(MpegEncContext *s, int16_t *block, int n, int qscale) { int i, level, qmul, qadd; int nCoeffs; qadd = (qscale - 1) | 1; qmul = qscale << 1; if (s->mb_intra) { if (!s->h263_aic) { if (n < 4) block[0] = block[0] * s->y_dc_scale; else block[0] = block[0] * s->c_dc_scale; }else qadd = 0; i = 1; nCoeffs= 63; //does not always use zigzag table } else { i = 0; av_assert2(s->block_last_index[n]>=0); nCoeffs= s->intra_scantable.raster_end[ s->block_last_index[n] ]; } { register const vector signed short vczero = (const vector signed short)vec_splat_s16(0); DECLARE_ALIGNED(16, short, qmul8) = qmul; DECLARE_ALIGNED(16, short, qadd8) = qadd; register vector signed short blockv, qmulv, qaddv, nqaddv, temp1; register vector bool short blockv_null, blockv_neg; register short backup_0 = block[0]; register int j = 0; qmulv = vec_splat((vec_s16)vec_lde(0, &qmul8), 0); qaddv = vec_splat((vec_s16)vec_lde(0, &qadd8), 0); nqaddv = vec_sub(vczero, qaddv); // vectorize all the 16 bytes-aligned blocks // of 8 elements for(; (j + 7) <= nCoeffs ; j+=8) { blockv = vec_ld(j << 1, block); blockv_neg = vec_cmplt(blockv, vczero); blockv_null = vec_cmpeq(blockv, vczero); // choose between +qadd or -qadd as the third operand temp1 = vec_sel(qaddv, nqaddv, blockv_neg); // multiply & add (block{i,i+7} * qmul [+-] qadd) temp1 = vec_mladd(blockv, qmulv, temp1); // put 0 where block[{i,i+7} used to have 0 blockv = vec_sel(temp1, blockv, blockv_null); vec_st(blockv, j << 1, block); } // if nCoeffs isn't a multiple of 8, finish the job // using good old scalar units. // (we could do it using a truncated vector, // but I'm not sure it's worth the hassle) for(; j <= nCoeffs ; j++) { level = block[j]; if (level) { if (level < 0) { level = level * qmul - qadd; } else { level = level * qmul + qadd; } block[j] = level; } } if (i == 1) { // cheat. this avoid special-casing the first iteration block[0] = backup_0; } } } #endif /* HAVE_ALTIVEC */ av_cold void ff_mpv_common_init_ppc(MpegEncContext *s) { #if HAVE_ALTIVEC if (!PPC_ALTIVEC(av_get_cpu_flags())) return; if ((s->avctx->dct_algo == FF_DCT_AUTO) || (s->avctx->dct_algo == FF_DCT_ALTIVEC)) { s->dct_unquantize_h263_intra = dct_unquantize_h263_altivec; s->dct_unquantize_h263_inter = dct_unquantize_h263_altivec; } #endif /* HAVE_ALTIVEC */ }