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ffmpeg / libavcodec / ps2 / mpegvideo_mmi.c @ 2912e87a

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