/* * Alpha optimized DSP utils * Copyright (c) 2002 Falk Hueffner <falk@debian.org> * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavcodec/dsputil.h" #include "libavcodec/mpegvideo.h" #include "asm.h" static void dct_unquantize_h263_axp(DCTELEM *block, int n_coeffs, uint64_t qscale, uint64_t qadd) { uint64_t qmul = qscale << 1; uint64_t correction = WORD_VEC(qmul * 255 >> 8); int i; qadd = WORD_VEC(qadd); for(i = 0; i <= n_coeffs; block += 4, i += 4) { uint64_t levels, negmask, zeros, add, sub; levels = ldq(block); if (levels == 0) continue; #ifdef __alpha_max__ /* I don't think the speed difference justifies runtime detection. */ negmask = maxsw4(levels, -1); /* negative -> ffff (-1) */ negmask = minsw4(negmask, 0); /* positive -> 0000 (0) */ #else negmask = cmpbge(WORD_VEC(0x7fff), levels); negmask &= (negmask >> 1) | (1 << 7); negmask = zap(-1, negmask); #endif zeros = cmpbge(0, levels); zeros &= zeros >> 1; /* zeros |= zeros << 1 is not needed since qadd <= 255, so zapping the lower byte suffices. */ levels *= qmul; levels -= correction & (negmask << 16); add = qadd & ~negmask; sub = qadd & negmask; /* Set qadd to 0 for levels == 0. */ add = zap(add, zeros); levels += add; levels -= sub; stq(levels, block); } } static void dct_unquantize_h263_intra_axp(MpegEncContext *s, DCTELEM *block, int n, int qscale) { int n_coeffs; uint64_t qadd; DCTELEM block0 = block[0]; if (!s->h263_aic) { if (n < 4) block0 *= s->y_dc_scale; else block0 *= s->c_dc_scale; qadd = (qscale - 1) | 1; } else { qadd = 0; } if(s->ac_pred) n_coeffs = 63; else n_coeffs = s->inter_scantable.raster_end[s->block_last_index[n]]; dct_unquantize_h263_axp(block, n_coeffs, qscale, qadd); block[0] = block0; } static void dct_unquantize_h263_inter_axp(MpegEncContext *s, DCTELEM *block, int n, int qscale) { int n_coeffs = s->inter_scantable.raster_end[s->block_last_index[n]]; dct_unquantize_h263_axp(block, n_coeffs, qscale, (qscale - 1) | 1); } void MPV_common_init_axp(MpegEncContext *s) { s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_axp; s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_axp; }