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https://github.com/FFmpeg/FFmpeg.git
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111 lines
3.2 KiB
C
111 lines
3.2 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 file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "libavcodec/dsputil.h"
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#include "libavcodec/mpegvideo.h"
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#include "asm.h"
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static void dct_unquantize_h263_axp(DCTELEM *block, int n_coeffs,
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uint64_t qscale, uint64_t qadd)
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{
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uint64_t qmul = qscale << 1;
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uint64_t correction = WORD_VEC(qmul * 255 >> 8);
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int i;
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qadd = WORD_VEC(qadd);
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for(i = 0; i <= n_coeffs; block += 4, i += 4) {
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uint64_t levels, negmask, zeros, add, sub;
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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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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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add = qadd & ~negmask;
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sub = qadd & 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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levels -= sub;
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stq(levels, block);
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}
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}
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static void dct_unquantize_h263_intra_axp(MpegEncContext *s, DCTELEM *block,
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int n, int qscale)
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{
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int n_coeffs;
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uint64_t qadd;
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DCTELEM block0 = block[0];
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if (!s->h263_aic) {
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if (n < 4)
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block0 *= s->y_dc_scale;
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else
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block0 *= s->c_dc_scale;
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qadd = (qscale - 1) | 1;
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} else {
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qadd = 0;
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}
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if(s->ac_pred)
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n_coeffs = 63;
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else
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n_coeffs = s->inter_scantable.raster_end[s->block_last_index[n]];
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dct_unquantize_h263_axp(block, n_coeffs, qscale, qadd);
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block[0] = block0;
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}
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static void dct_unquantize_h263_inter_axp(MpegEncContext *s, DCTELEM *block,
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int n, int qscale)
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{
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int n_coeffs = s->inter_scantable.raster_end[s->block_last_index[n]];
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dct_unquantize_h263_axp(block, n_coeffs, qscale, (qscale - 1) | 1);
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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_intra = dct_unquantize_h263_intra_axp;
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s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_axp;
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}
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