mirror of https://git.ffmpeg.org/ffmpeg.git
89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
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/*
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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 program 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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* This program 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., 675 Mass Ave, Cambridge, MA 02139, 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,
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DCTELEM *block, int n, int qscale)
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{
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int i, level;
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UINT64 qmul, qadd;
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if (s->mb_intra) {
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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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/* Catch up to aligned point. */
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qmul = s->qscale << 1;
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qadd = (s->qscale - 1) | 1;
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for (i = 1; i < 4; ++i) {
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level = block[i];
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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[i] = level;
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}
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}
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block += 4;
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i = 60 / 4;
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} else {
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i = zigzag_end[s->block_last_index[n]] / 4;
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}
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qmul = s->qscale << 1;
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qadd = WORD_VEC((qscale - 1) | 1);
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do {
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UINT64 levels, negmask, zeromask, corr;
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levels = ldq(block);
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if (levels == 0)
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continue;
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zeromask = cmpbge(0, levels);
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zeromask &= zeromask >> 1;
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/* Negate all negative words. */
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negmask = maxsw4(levels, WORD_VEC(0xffff)); /* negative -> ffff (-1) */
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negmask = minsw4(negmask, 0); /* positive -> 0000 (0) */
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corr = negmask & WORD_VEC(0x0001); /* twos-complement correction */
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levels ^= negmask;
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levels += corr;
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levels = levels * qmul;
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levels += zap(qadd, zeromask);
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/* Re-negate negative words. */
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levels -= corr;
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levels ^= negmask;
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stq(levels, block);
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} while (block += 4, --i);
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}
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void MPV_common_init_axp(MpegEncContext *s)
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{
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if (amask(AMASK_MVI) == 0) {
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if (s->out_format == FMT_H263)
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s->dct_unquantize = dct_unquantize_h263_axp;
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}
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}
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