mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/*
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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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "dsputil.h"
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#include "mpegvideo.h"
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#include "avcodec.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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