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/*
* Copyright (c) 2000,2001 Fabrice Bellard.
*
* MMI optimization by Leon van Stuivenberg
*
* 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 "libavcodec/avcodec.h"
#include "libavcodec/dsputil.h"
#include "libavcodec/mpegvideo.h"
static void dct_unquantize_h263_mmi(MpegEncContext *s,
DCTELEM *block, int n, int qscale)
{
int level=0, qmul, qadd;
int nCoeffs;
assert(s->block_last_index[n]>=0);
qadd = (qscale - 1) | 1;
qmul = qscale << 1;
if (s->mb_intra) {
if (!s->h263_aic) {
if (n < 4)
level = block[0] * s->y_dc_scale;
else
level = block[0] * s->c_dc_scale;
}else {
qadd = 0;
level = block[0];
}
nCoeffs= 63; //does not always use zigzag table
} else {
nCoeffs= s->intra_scantable.raster_end[ s->block_last_index[n] ];
}
asm volatile(
"add $14, $0, %3 \n\t"
"pcpyld $8, %0, %0 \n\t"
"pcpyh $8, $8 \n\t" //r8 = qmul
"pcpyld $9, %1, %1 \n\t"
"pcpyh $9, $9 \n\t" //r9 = qadd
".p2align 2 \n\t"
"1: \n\t"
"lq $10, 0($14) \n\t" //r10 = level
"addi $14, $14, 16 \n\t" //block+=8
"addi %2, %2, -8 \n\t"
"pcgth $11, $0, $10 \n\t" //r11 = level < 0 ? -1 : 0
"pcgth $12, $10, $0 \n\t" //r12 = level > 0 ? -1 : 0
"por $12, $11, $12 \n\t"
"pmulth $10, $10, $8 \n\t"
"paddh $13, $9, $11 \n\t"
"pxor $13, $13, $11 \n\t" //r13 = level < 0 ? -qadd : qadd
"pmfhl.uw $11 \n\t"
"pinteh $10, $11, $10 \n\t" //r10 = level * qmul
"paddh $10, $10, $13 \n\t"
"pand $10, $10, $12 \n\t"
"sq $10, -16($14) \n\t"
"bgez %2, 1b \n\t"
:: "r"(qmul), "r" (qadd), "r" (nCoeffs), "r" (block) : "$8", "$9", "$10", "$11", "$12", "$13", "$14", "memory" );
if(s->mb_intra)
block[0]= level;
}
void MPV_common_init_mmi(MpegEncContext *s)
{
s->dct_unquantize_h263_intra =
s->dct_unquantize_h263_inter = dct_unquantize_h263_mmi;
}
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