98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
/*
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* Alpha optimized DSP utils
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* Copyright (c) 2002 Falk Hueffner <falk@debian.org>
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; 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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#include "asm.h"
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#include "../dsputil.h"
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#include "../mpegvideo.h"
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extern UINT8 zigzag_end[64];
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static void dct_unquantize_h263_axp(MpegEncContext *s, DCTELEM *block,
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int n, int qscale)
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{
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int i, n_coeffs;
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uint64_t qmul, qadd;
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uint64_t correction;
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DCTELEM *orig_block = block;
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DCTELEM block0;
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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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block0 = block[0] * s->y_dc_scale;
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else
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block0 = block[0] * s->c_dc_scale;
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}
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n_coeffs = 64; // does not always use zigzag table
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} else {
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n_coeffs = zigzag_end[s->block_last_index[n]];
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}
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qmul = qscale << 1;
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qadd = WORD_VEC((qscale - 1) | 1);
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/* This mask kills spill from negative subwords to the next subword. */
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correction = WORD_VEC((qmul - 1) + 1); /* multiplication / addition */
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for(i = 0; i < n_coeffs; block += 4, i += 4) {
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uint64_t levels, negmask, zeros, add;
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levels = ldq(block);
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if (levels == 0)
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continue;
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#ifdef __alpha_max__
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/* I don't think the speed difference justifies runtime
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detection. */
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ASM_ACCEPT_MVI;
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negmask = maxsw4(levels, -1); /* negative -> ffff (-1) */
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negmask = minsw4(negmask, 0); /* positive -> 0000 (0) */
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#else
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negmask = cmpbge(WORD_VEC(0x7fff), levels);
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negmask &= (negmask >> 1) | (1 << 7);
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negmask = zap(-1, negmask);
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#endif
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zeros = cmpbge(0, levels);
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zeros &= zeros >> 1;
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/* zeros |= zeros << 1 is not needed since qadd <= 255, so
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zapping the lower byte suffices. */
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levels *= qmul;
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levels -= correction & (negmask << 16);
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/* Negate qadd for negative levels. */
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add = qadd ^ negmask;
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add += WORD_VEC(0x0001) & negmask;
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/* Set qadd to 0 for levels == 0. */
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add = zap(add, zeros);
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levels += add;
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stq(levels, block);
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}
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if (s->mb_intra && !s->h263_aic)
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orig_block[0] = block0;
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}
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void MPV_common_init_axp(MpegEncContext *s)
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{
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s->dct_unquantize_h263 = dct_unquantize_h263_axp;
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}
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