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/*
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 * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
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 * Copyright (c) 2003-2010 Michael Niedermayer <michaelni@gmx.at>
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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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/**
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 * @file
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 * H.264 / AVC / MPEG4 part10 DSP functions.
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 * @author Michael Niedermayer <michaelni@gmx.at>
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 */
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#include <stdint.h>
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#include "avcodec.h"
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#include "h264dsp.h"
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#define op_scale1(x)  block[x] = av_clip_uint8( (block[x]*weight + offset) >> log2_denom )
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#define op_scale2(x)  dst[x] = av_clip_uint8( (src[x]*weights + dst[x]*weightd + offset) >> (log2_denom+1))
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#define H264_WEIGHT(W,H) \
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static void weight_h264_pixels ## W ## x ## H ## _c(uint8_t *block, int stride, int log2_denom, int weight, int offset){ \
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    int y; \
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    offset <<= log2_denom; \
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    if(log2_denom) offset += 1<<(log2_denom-1); \
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    for(y=0; y<H; y++, block += stride){ \
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        op_scale1(0); \
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        op_scale1(1); \
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        if(W==2) continue; \
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        op_scale1(2); \
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        op_scale1(3); \
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        if(W==4) continue; \
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        op_scale1(4); \
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        op_scale1(5); \
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        op_scale1(6); \
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        op_scale1(7); \
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        if(W==8) continue; \
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        op_scale1(8); \
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        op_scale1(9); \
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        op_scale1(10); \
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        op_scale1(11); \
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        op_scale1(12); \
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        op_scale1(13); \
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        op_scale1(14); \
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        op_scale1(15); \
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    } \
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} \
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static void biweight_h264_pixels ## W ## x ## H ## _c(uint8_t *dst, uint8_t *src, int stride, int log2_denom, int weightd, int weights, int offset){ \
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    int y; \
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    offset = ((offset + 1) | 1) << log2_denom; \
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    for(y=0; y<H; y++, dst += stride, src += stride){ \
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        op_scale2(0); \
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        op_scale2(1); \
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        if(W==2) continue; \
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        op_scale2(2); \
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        op_scale2(3); \
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        if(W==4) continue; \
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        op_scale2(4); \
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        op_scale2(5); \
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        op_scale2(6); \
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        op_scale2(7); \
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        if(W==8) continue; \
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        op_scale2(8); \
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        op_scale2(9); \
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        op_scale2(10); \
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        op_scale2(11); \
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        op_scale2(12); \
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        op_scale2(13); \
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        op_scale2(14); \
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        op_scale2(15); \
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    } \
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}
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H264_WEIGHT(16,16)
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H264_WEIGHT(16,8)
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H264_WEIGHT(8,16)
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H264_WEIGHT(8,8)
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H264_WEIGHT(8,4)
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H264_WEIGHT(4,8)
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H264_WEIGHT(4,4)
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H264_WEIGHT(4,2)
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H264_WEIGHT(2,4)
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H264_WEIGHT(2,2)
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#undef op_scale1
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#undef op_scale2
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#undef H264_WEIGHT
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static av_always_inline av_flatten void h264_loop_filter_luma_c(uint8_t *pix, int xstride, int ystride, int alpha, int beta, int8_t *tc0)
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{
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    int i, d;
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    for( i = 0; i < 4; i++ ) {
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        if( tc0[i] < 0 ) {
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            pix += 4*ystride;
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            continue;
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        }
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        for( d = 0; d < 4; d++ ) {
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            const int p0 = pix[-1*xstride];
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            const int p1 = pix[-2*xstride];
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            const int p2 = pix[-3*xstride];
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            const int q0 = pix[0];
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            const int q1 = pix[1*xstride];
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            const int q2 = pix[2*xstride];
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            if( FFABS( p0 - q0 ) < alpha &&
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                FFABS( p1 - p0 ) < beta &&
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                FFABS( q1 - q0 ) < beta ) {
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                int tc = tc0[i];
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                int i_delta;
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                if( FFABS( p2 - p0 ) < beta ) {
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                    if(tc0[i])
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                    pix[-2*xstride] = p1 + av_clip( (( p2 + ( ( p0 + q0 + 1 ) >> 1 ) ) >> 1) - p1, -tc0[i], tc0[i] );
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                    tc++;
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                }
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                if( FFABS( q2 - q0 ) < beta ) {
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                    if(tc0[i])
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                    pix[   xstride] = q1 + av_clip( (( q2 + ( ( p0 + q0 + 1 ) >> 1 ) ) >> 1) - q1, -tc0[i], tc0[i] );
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                    tc++;
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                }
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                i_delta = av_clip( (((q0 - p0 ) << 2) + (p1 - q1) + 4) >> 3, -tc, tc );
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                pix[-xstride] = av_clip_uint8( p0 + i_delta );    /* p0' */
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                pix[0]        = av_clip_uint8( q0 - i_delta );    /* q0' */
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            }
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            pix += ystride;
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        }
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    }
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}
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static void h264_v_loop_filter_luma_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)
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{
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    h264_loop_filter_luma_c(pix, stride, 1, alpha, beta, tc0);
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}
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static void h264_h_loop_filter_luma_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)
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{
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    h264_loop_filter_luma_c(pix, 1, stride, alpha, beta, tc0);
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}
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static av_always_inline av_flatten void h264_loop_filter_luma_intra_c(uint8_t *pix, int xstride, int ystride, int alpha, int beta)
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{
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    int d;
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    for( d = 0; d < 16; d++ ) {
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        const int p2 = pix[-3*xstride];
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        const int p1 = pix[-2*xstride];
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        const int p0 = pix[-1*xstride];
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        const int q0 = pix[ 0*xstride];
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        const int q1 = pix[ 1*xstride];
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        const int q2 = pix[ 2*xstride];
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        if( FFABS( p0 - q0 ) < alpha &&
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            FFABS( p1 - p0 ) < beta &&
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            FFABS( q1 - q0 ) < beta ) {
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            if(FFABS( p0 - q0 ) < (( alpha >> 2 ) + 2 )){
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                if( FFABS( p2 - p0 ) < beta)
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                {
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                    const int p3 = pix[-4*xstride];
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                    /* p0', p1', p2' */
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                    pix[-1*xstride] = ( p2 + 2*p1 + 2*p0 + 2*q0 + q1 + 4 ) >> 3;
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                    pix[-2*xstride] = ( p2 + p1 + p0 + q0 + 2 ) >> 2;
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                    pix[-3*xstride] = ( 2*p3 + 3*p2 + p1 + p0 + q0 + 4 ) >> 3;
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                } else {
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                    /* p0' */
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                    pix[-1*xstride] = ( 2*p1 + p0 + q1 + 2 ) >> 2;
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                }
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                if( FFABS( q2 - q0 ) < beta)
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                {
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                    const int q3 = pix[3*xstride];
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                    /* q0', q1', q2' */
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                    pix[0*xstride] = ( p1 + 2*p0 + 2*q0 + 2*q1 + q2 + 4 ) >> 3;
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                    pix[1*xstride] = ( p0 + q0 + q1 + q2 + 2 ) >> 2;
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                    pix[2*xstride] = ( 2*q3 + 3*q2 + q1 + q0 + p0 + 4 ) >> 3;
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                } else {
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                    /* q0' */
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                    pix[0*xstride] = ( 2*q1 + q0 + p1 + 2 ) >> 2;
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                }
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            }else{
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                /* p0', q0' */
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                pix[-1*xstride] = ( 2*p1 + p0 + q1 + 2 ) >> 2;
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                pix[ 0*xstride] = ( 2*q1 + q0 + p1 + 2 ) >> 2;
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            }
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        }
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        pix += ystride;
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    }
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}
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static void h264_v_loop_filter_luma_intra_c(uint8_t *pix, int stride, int alpha, int beta)
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{
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    h264_loop_filter_luma_intra_c(pix, stride, 1, alpha, beta);
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}
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static void h264_h_loop_filter_luma_intra_c(uint8_t *pix, int stride, int alpha, int beta)
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{
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    h264_loop_filter_luma_intra_c(pix, 1, stride, alpha, beta);
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}
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static av_always_inline av_flatten void h264_loop_filter_chroma_c(uint8_t *pix, int xstride, int ystride, int alpha, int beta, int8_t *tc0)
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{
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    int i, d;
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    for( i = 0; i < 4; i++ ) {
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        const int tc = tc0[i];
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        if( tc <= 0 ) {
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            pix += 2*ystride;
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            continue;
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        }
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        for( d = 0; d < 2; d++ ) {
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            const int p0 = pix[-1*xstride];
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            const int p1 = pix[-2*xstride];
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            const int q0 = pix[0];
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            const int q1 = pix[1*xstride];
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            if( FFABS( p0 - q0 ) < alpha &&
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                FFABS( p1 - p0 ) < beta &&
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                FFABS( q1 - q0 ) < beta ) {
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                int delta = av_clip( (((q0 - p0 ) << 2) + (p1 - q1) + 4) >> 3, -tc, tc );
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                pix[-xstride] = av_clip_uint8( p0 + delta );    /* p0' */
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                pix[0]        = av_clip_uint8( q0 - delta );    /* q0' */
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            }
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            pix += ystride;
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        }
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    }
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}
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static void h264_v_loop_filter_chroma_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)
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{
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    h264_loop_filter_chroma_c(pix, stride, 1, alpha, beta, tc0);
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}
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static void h264_h_loop_filter_chroma_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)
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{
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    h264_loop_filter_chroma_c(pix, 1, stride, alpha, beta, tc0);
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}
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static av_always_inline av_flatten void h264_loop_filter_chroma_intra_c(uint8_t *pix, int xstride, int ystride, int alpha, int beta)
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{
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    int d;
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    for( d = 0; d < 8; d++ ) {
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        const int p0 = pix[-1*xstride];
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        const int p1 = pix[-2*xstride];
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        const int q0 = pix[0];
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        const int q1 = pix[1*xstride];
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        if( FFABS( p0 - q0 ) < alpha &&
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            FFABS( p1 - p0 ) < beta &&
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            FFABS( q1 - q0 ) < beta ) {
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            pix[-xstride] = ( 2*p1 + p0 + q1 + 2 ) >> 2;   /* p0' */
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            pix[0]        = ( 2*q1 + q0 + p1 + 2 ) >> 2;   /* q0' */
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        }
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        pix += ystride;
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    }
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}
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static void h264_v_loop_filter_chroma_intra_c(uint8_t *pix, int stride, int alpha, int beta)
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{
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    h264_loop_filter_chroma_intra_c(pix, stride, 1, alpha, beta);
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}
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static void h264_h_loop_filter_chroma_intra_c(uint8_t *pix, int stride, int alpha, int beta)
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{
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    h264_loop_filter_chroma_intra_c(pix, 1, stride, alpha, beta);
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}
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void ff_h264dsp_init(H264DSPContext *c)
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{
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    c->h264_idct_add= ff_h264_idct_add_c;
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    c->h264_idct8_add= ff_h264_idct8_add_c;
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    c->h264_idct_dc_add= ff_h264_idct_dc_add_c;
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    c->h264_idct8_dc_add= ff_h264_idct8_dc_add_c;
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    c->h264_idct_add16     = ff_h264_idct_add16_c;
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    c->h264_idct8_add4     = ff_h264_idct8_add4_c;
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    c->h264_idct_add8      = ff_h264_idct_add8_c;
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    c->h264_idct_add16intra= ff_h264_idct_add16intra_c;
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    c->h264_luma_dc_dequant_idct= ff_h264_luma_dc_dequant_idct_c;
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    c->weight_h264_pixels_tab[0]= weight_h264_pixels16x16_c;
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    c->weight_h264_pixels_tab[1]= weight_h264_pixels16x8_c;
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    c->weight_h264_pixels_tab[2]= weight_h264_pixels8x16_c;
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    c->weight_h264_pixels_tab[3]= weight_h264_pixels8x8_c;
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    c->weight_h264_pixels_tab[4]= weight_h264_pixels8x4_c;
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    c->weight_h264_pixels_tab[5]= weight_h264_pixels4x8_c;
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    c->weight_h264_pixels_tab[6]= weight_h264_pixels4x4_c;
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    c->weight_h264_pixels_tab[7]= weight_h264_pixels4x2_c;
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    c->weight_h264_pixels_tab[8]= weight_h264_pixels2x4_c;
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    c->weight_h264_pixels_tab[9]= weight_h264_pixels2x2_c;
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    c->biweight_h264_pixels_tab[0]= biweight_h264_pixels16x16_c;
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    c->biweight_h264_pixels_tab[1]= biweight_h264_pixels16x8_c;
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    c->biweight_h264_pixels_tab[2]= biweight_h264_pixels8x16_c;
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    c->biweight_h264_pixels_tab[3]= biweight_h264_pixels8x8_c;
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    c->biweight_h264_pixels_tab[4]= biweight_h264_pixels8x4_c;
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    c->biweight_h264_pixels_tab[5]= biweight_h264_pixels4x8_c;
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    c->biweight_h264_pixels_tab[6]= biweight_h264_pixels4x4_c;
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    c->biweight_h264_pixels_tab[7]= biweight_h264_pixels4x2_c;
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    c->biweight_h264_pixels_tab[8]= biweight_h264_pixels2x4_c;
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    c->biweight_h264_pixels_tab[9]= biweight_h264_pixels2x2_c;
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    c->h264_v_loop_filter_luma= h264_v_loop_filter_luma_c;
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    c->h264_h_loop_filter_luma= h264_h_loop_filter_luma_c;
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    c->h264_v_loop_filter_luma_intra= h264_v_loop_filter_luma_intra_c;
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    c->h264_h_loop_filter_luma_intra= h264_h_loop_filter_luma_intra_c;
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    c->h264_v_loop_filter_chroma= h264_v_loop_filter_chroma_c;
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    c->h264_h_loop_filter_chroma= h264_h_loop_filter_chroma_c;
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    c->h264_v_loop_filter_chroma_intra= h264_v_loop_filter_chroma_intra_c;
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    c->h264_h_loop_filter_chroma_intra= h264_h_loop_filter_chroma_intra_c;
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    c->h264_loop_filter_strength= NULL;
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    if (ARCH_ARM) ff_h264dsp_init_arm(c);
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    if (HAVE_ALTIVEC) ff_h264dsp_init_ppc(c);
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    if (HAVE_MMX) ff_h264dsp_init_x86(c);
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}