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/*****************************************************************************
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* slicetype.c: h264 encoder library
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*****************************************************************************
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* Copyright (C) 2005 Loren Merritt
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* Authors: Loren Merritt <lorenm@u.washington.edu>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program 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
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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#include "common/common.h"
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#include "common/cpu.h"
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#include "macroblock.h"
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static void x264_lowres_context_init( x264_t *h, x264_mb_analysis_t *a )
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a->i_qp = 12; // arbitrary, but low because SATD scores are 1/4 normal
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a->i_lambda = i_qp0_cost_table[ a->i_qp ];
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x264_mb_analyse_load_costs( h, a );
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h->mb.i_me_method = X264_MIN( X264_ME_HEX, h->param.analyse.i_me_method ); // maybe dia?
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h->mb.i_subpel_refine = 4; // 3 should be enough, but not tweaking for speed now
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h->mb.b_chroma_me = 0;
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int x264_slicetype_mb_cost( x264_t *h, x264_mb_analysis_t *a,
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x264_frame_t **frames, int p0, int p1, int b,
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int dist_scale_factor )
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x264_frame_t *fref0 = frames[p0];
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x264_frame_t *fref1 = frames[p1];
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x264_frame_t *fenc = frames[b];
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const int b_bidir = (b < p1);
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const int i_mb_x = h->mb.i_mb_x;
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const int i_mb_y = h->mb.i_mb_y;
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const int i_mb_stride = h->sps->i_mb_width;
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const int i_mb_xy = i_mb_x + i_mb_y * i_mb_stride;
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const int i_stride = fenc->i_stride_lowres;
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const int i_pel_offset = 8 * ( i_mb_x + i_mb_y * i_stride );
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DECLARE_ALIGNED( uint8_t, pix1[9*FDEC_STRIDE], 8 );
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uint8_t *pix2 = pix1+8;
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int i_bcost = COST_MAX;
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h->mb.pic.p_fenc[0] = h->mb.pic.fenc_buf;
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h->mc.copy[PIXEL_8x8]( h->mb.pic.p_fenc[0], FENC_STRIDE, &fenc->lowres[0][i_pel_offset], i_stride, 8 );
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if( !p0 && !p1 && !b )
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// no need for h->mb.mv_min[]
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h->mb.mv_min_fpel[0] = -8*h->mb.i_mb_x - 4;
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h->mb.mv_max_fpel[0] = 8*( h->sps->i_mb_width - h->mb.i_mb_x - 1 ) + 4;
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h->mb.mv_min_spel[0] = 4*( h->mb.mv_min_fpel[0] - 8 );
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h->mb.mv_max_spel[0] = 4*( h->mb.mv_max_fpel[0] + 8 );
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if( h->mb.i_mb_x <= 1 )
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h->mb.mv_min_fpel[1] = -8*h->mb.i_mb_y - 4;
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h->mb.mv_max_fpel[1] = 8*( h->sps->i_mb_height - h->mb.i_mb_y - 1 ) + 4;
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h->mb.mv_min_spel[1] = 4*( h->mb.mv_min_fpel[1] - 8 );
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h->mb.mv_max_spel[1] = 4*( h->mb.mv_max_fpel[1] + 8 );
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#define LOAD_HPELS_LUMA(dst, src) \
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(dst)[0] = &(src)[0][i_pel_offset]; \
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(dst)[1] = &(src)[1][i_pel_offset]; \
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(dst)[2] = &(src)[2][i_pel_offset]; \
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(dst)[3] = &(src)[3][i_pel_offset]; \
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#define SAVE_MVS( mv0, mv1 ) \
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fenc->mv[0][i_mb_xy][0] = mv0[0]; \
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fenc->mv[0][i_mb_xy][1] = mv0[1]; \
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fenc->mv[1][i_mb_xy][0] = mv1[0]; \
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fenc->mv[1][i_mb_xy][1] = mv1[1]; \
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#define CLIP_MV( mv ) \
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mv[0] = x264_clip3( mv[0], h->mb.mv_min_spel[0], h->mb.mv_max_spel[0] ); \
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mv[1] = x264_clip3( mv[1], h->mb.mv_min_spel[1], h->mb.mv_max_spel[1] ); \
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#define TRY_BIDIR( mv0, mv1, penalty ) \
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h->mc.mc_luma( pix1, 16, m[0].p_fref, m[0].i_stride[0], \
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(mv0)[0], (mv0)[1], 8, 8 ); \
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src2 = h->mc.get_ref( pix2, &stride2, m[1].p_fref, m[1].i_stride[0], \
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(mv1)[0], (mv1)[1], 8, 8 ); \
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h->mc.avg[PIXEL_8x8]( pix1, 16, src2, stride2 ); \
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i_cost = penalty + h->pixf.mbcmp[PIXEL_8x8]( \
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m[0].p_fenc[0], FENC_STRIDE, pix1, 16 ); \
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if( i_bcost > i_cost ) \
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SAVE_MVS( mv0, mv1 ); \
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m[0].i_pixel = PIXEL_8x8;
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m[0].p_cost_mv = a->p_cost_mv;
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m[0].i_stride[0] = i_stride;
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m[0].p_fenc[0] = h->mb.pic.p_fenc[0];
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LOAD_HPELS_LUMA( m[0].p_fref, fref0->lowres );
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int16_t *mvr = fref1->mv[0][i_mb_xy];
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LOAD_HPELS_LUMA( m[1].p_fref, fref1->lowres );
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dmv[0][0] = ( mvr[0] * dist_scale_factor + 128 ) >> 8;
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dmv[0][1] = ( mvr[1] * dist_scale_factor + 128 ) >> 8;
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dmv[1][0] = dmv[0][0] - mvr[0];
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dmv[1][1] = dmv[0][1] - mvr[1];
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TRY_BIDIR( dmv[0], dmv[1], 0 );
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if( dmv[0][0] || dmv[0][1] || dmv[1][0] || dmv[1][1] )
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TRY_BIDIR( mv0, mv0, 0 );
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// if( i_bcost < 60 ) // arbitrary threshold
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i_cost_bak = i_bcost;
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for( l = 0; l < 1 + b_bidir; l++ )
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int mvc[4][2] = {{0}}, i_mvc;
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int16_t (*fenc_mv)[2] = &fenc->mv[l][i_mb_xy];
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#define MVC(mv) { mvc[i_mvc][0] = mv[0]; mvc[i_mvc][1] = mv[1]; i_mvc++; }
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MVC(fenc_mv[-i_mb_stride]);
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if( i_mb_x < h->sps->i_mb_width - 1 )
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MVC(fenc_mv[-i_mb_stride+1]);
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MVC(fenc_mv[-i_mb_stride-1]);
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m[l].mvp[0] = x264_median( mvc[0][0], mvc[1][0], mvc[2][0] );
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m[l].mvp[1] = x264_median( mvc[0][1], mvc[1][1], mvc[2][1] );
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x264_me_search( h, &m[l], mvc, i_mvc );
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m[l].cost -= 2; // remove mvcost from skip mbs
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if( m[l].mv[0] || m[l].mv[1] )
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i_bcost = X264_MIN( i_bcost, m[l].cost );
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if( b_bidir && (m[0].mv[0] || m[0].mv[1] || m[1].mv[0] || m[1].mv[1]) )
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TRY_BIDIR( m[0].mv, m[1].mv, 5 );
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if( i_bcost < i_cost_bak )
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SAVE_MVS( m[0].mv, m[1].mv );
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//FIXME intra part could be shared across multiple encodings of the frame
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if( !b_bidir ) // forbid intra-mbs in B-frames, because it's rare and not worth checking
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uint8_t *pix = &pix1[8+FDEC_STRIDE - 1];
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uint8_t *src = &fenc->lowres[0][i_pel_offset - 1];
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const int intra_penalty = 5;
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int satds[4], i_icost, b_intra;
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memcpy( pix-FDEC_STRIDE, src-i_stride, 17 );
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pix[i*FDEC_STRIDE] = src[i*i_stride];
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if( h->pixf.intra_satd_x3_8x8c && h->pixf.mbcmp[0] == h->pixf.satd[0] )
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h->pixf.intra_satd_x3_8x8c( h->mb.pic.p_fenc[0], pix, satds );
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h->predict_8x8c[I_PRED_CHROMA_P]( pix );
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satds[I_PRED_CHROMA_P] =
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h->pixf.satd[PIXEL_8x8]( pix, FDEC_STRIDE, h->mb.pic.p_fenc[0], FENC_STRIDE );
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h->predict_8x8c[i]( pix );
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satds[i] = h->pixf.mbcmp[PIXEL_8x8]( pix, FDEC_STRIDE, h->mb.pic.p_fenc[0], FENC_STRIDE );
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i_icost = X264_MIN4( satds[0], satds[1], satds[2], satds[3] );
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if( i_icost < i_bcost * 2 )
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DECLARE_ALIGNED( uint8_t, edge[33], 8 );
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x264_predict_8x8_filter( pix, edge, ALL_NEIGHBORS, ALL_NEIGHBORS );
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h->predict_8x8[i]( pix, edge );
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satd = h->pixf.mbcmp[PIXEL_8x8]( pix, FDEC_STRIDE, h->mb.pic.p_fenc[0], FENC_STRIDE );
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i_icost = X264_MIN( i_icost, satd );
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i_icost += intra_penalty;
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b_intra = i_icost < i_bcost;
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if( i_mb_x > 0 && i_mb_x < h->sps->i_mb_width - 1
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&& i_mb_y > 0 && i_mb_y < h->sps->i_mb_height - 1 )
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fenc->i_intra_mbs[b-p0] += b_intra;
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fenc->i_cost_est[0][0] += i_icost;
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int x264_slicetype_frame_cost( x264_t *h, x264_mb_analysis_t *a,
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x264_frame_t **frames, int p0, int p1, int b,
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int b_intra_penalty )
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/* Check whether we already evaluated this frame
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* If we have tried this frame as P, then we have also tried
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* the preceding frames as B. (is this still true?) */
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if( frames[b]->i_cost_est[b-p0][p1-b] >= 0 )
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i_score = frames[b]->i_cost_est[b-p0][p1-b];
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int dist_scale_factor = 128;
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int *row_satd = frames[b]->i_row_satds[b-p0][p1-b];
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/* Init MVs so that we don't have to check edge conditions when loading predictors. */
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/* FIXME: not needed every time */
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memset( frames[b]->mv[0], 0, h->sps->i_mb_height * h->sps->i_mb_width * 2*sizeof(int16_t) );
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memset( frames[b]->mv[1], 0, h->sps->i_mb_height * h->sps->i_mb_width * 2*sizeof(int16_t) );
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frames[b]->i_intra_mbs[b-p0] = 0;
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frames[b]->i_cost_est[0][0] = 0;
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dist_scale_factor = ( ((b-p0) << 8) + ((p1-p0) >> 1) ) / (p1-p0);
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/* the edge mbs seem to reduce the predictive quality of the
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* whole frame's score, but are needed for a spatial distribution. */
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if( h->param.rc.i_vbv_buffer_size )
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for( h->mb.i_mb_y = 0; h->mb.i_mb_y < h->sps->i_mb_height; h->mb.i_mb_y++ )
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row_satd[ h->mb.i_mb_y ] = 0;
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for( h->mb.i_mb_x = 0; h->mb.i_mb_x < h->sps->i_mb_width; h->mb.i_mb_x++ )
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int i_mb_cost = x264_slicetype_mb_cost( h, a, frames, p0, p1, b, dist_scale_factor );
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row_satd[ h->mb.i_mb_y ] += i_mb_cost;
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if( h->mb.i_mb_y > 0 && h->mb.i_mb_y < h->sps->i_mb_height - 1 &&
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h->mb.i_mb_x > 0 && h->mb.i_mb_x < h->sps->i_mb_width - 1 )
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i_score += i_mb_cost;
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for( h->mb.i_mb_y = 1; h->mb.i_mb_y < h->sps->i_mb_height - 1; h->mb.i_mb_y++ )
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for( h->mb.i_mb_x = 1; h->mb.i_mb_x < h->sps->i_mb_width - 1; h->mb.i_mb_x++ )
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i_score += x264_slicetype_mb_cost( h, a, frames, p0, p1, b, dist_scale_factor );
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i_score = i_score * 100 / (120 + h->param.i_bframe_bias);
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frames[b]->i_cost_est[b-p0][p1-b] = i_score;
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// fprintf( stderr, "frm %d %c(%d,%d): %6d %6d imb:%d \n", frames[b]->i_frame,
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// (p1==0?'I':b<p1?'B':'P'), b-p0, p1-b, i_score, frames[b]->i_cost_est[0][0], frames[b]->i_intra_mbs[b-p0] );
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x264_cpu_restore( h->param.cpu );
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if( b_intra_penalty )
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// arbitrary penalty for I-blocks after B-frames
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int nmb = (h->sps->i_mb_width - 2) * (h->sps->i_mb_height - 2);
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i_score += i_score * frames[b]->i_intra_mbs[b-p0] / (nmb * 8);
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static int scenecut( x264_t *h, x264_frame_t *frame, int pdist )
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int icost = frame->i_cost_est[0][0];
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int pcost = frame->i_cost_est[pdist][0];
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int i_gop_size = frame->i_frame - h->frames.i_last_idr;
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float f_thresh_max = h->param.i_scenecut_threshold / 100.0;
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/* magic numbers pulled out of thin air */
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float f_thresh_min = f_thresh_max * h->param.i_keyint_min
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/ ( h->param.i_keyint_max * 4 );
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if( h->param.i_keyint_min == h->param.i_keyint_max )
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f_thresh_min= f_thresh_max;
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if( i_gop_size < h->param.i_keyint_min / 4 )
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f_bias = f_thresh_min / 4;
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else if( i_gop_size <= h->param.i_keyint_min )
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f_bias = f_thresh_min * i_gop_size / h->param.i_keyint_min;
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f_bias = f_thresh_min
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+ ( f_thresh_max - f_thresh_min )
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* ( i_gop_size - h->param.i_keyint_min )
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/ ( h->param.i_keyint_max - h->param.i_keyint_min );
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res = pcost >= (1.0 - f_bias) * icost;
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int imb = frame->i_intra_mbs[pdist];
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int pmb = (h->sps->i_mb_width - 2) * (h->sps->i_mb_height - 2) - imb;
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x264_log( h, X264_LOG_DEBUG, "scene cut at %d Icost:%d Pcost:%d ratio:%.4f bias:%.4f gop:%d (imb:%d pmb:%d)\n",
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icost, pcost, 1. - (double)pcost / icost,
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f_bias, i_gop_size, imb, pmb );
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void x264_slicetype_analyse( x264_t *h )
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x264_mb_analysis_t a;
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x264_frame_t *frames[X264_BFRAME_MAX+3] = { NULL, };
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int i_mb_count = (h->sps->i_mb_width - 2) * (h->sps->i_mb_height - 2);
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int cost1p0, cost2p0, cost1b1, cost2p1;
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assert( h->frames.b_have_lowres );
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if( !h->frames.last_nonb )
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frames[0] = h->frames.last_nonb;
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for( j = 0; h->frames.next[j]; j++ )
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frames[j+1] = h->frames.next[j];
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keyint_limit = h->param.i_keyint_max - frames[0]->i_frame + h->frames.i_last_idr - 1;
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num_frames = X264_MIN( j, keyint_limit );
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if( num_frames == 0 )
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x264_lowres_context_init( h, &a );
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idr_frame_type = frames[1]->i_frame - h->frames.i_last_idr >= h->param.i_keyint_min ? X264_TYPE_IDR : X264_TYPE_I;
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if( num_frames == 1 )
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frames[1]->i_type = X264_TYPE_P;
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if( h->param.b_pre_scenecut )
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x264_slicetype_frame_cost( h, &a, frames, 0, 1, 1, 0 );
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if( scenecut( h, frames[1], 1 ) )
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frames[1]->i_type = idr_frame_type;
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cost2p1 = x264_slicetype_frame_cost( h, &a, frames, 0, 2, 2, 1 );
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if( frames[2]->i_intra_mbs[2] > i_mb_count / 2 )
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cost1b1 = x264_slicetype_frame_cost( h, &a, frames, 0, 2, 1, 0 );
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cost1p0 = x264_slicetype_frame_cost( h, &a, frames, 0, 1, 1, 0 );
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cost2p0 = x264_slicetype_frame_cost( h, &a, frames, 1, 2, 2, 0 );
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// fprintf( stderr, "PP: %d + %d <=> BP: %d + %d \n",
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// cost1p0, cost2p0, cost1b1, cost2p1 );
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if( cost1p0 + cost2p0 < cost1b1 + cost2p1 )
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// arbitrary and untuned
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#define INTER_THRESH 300
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#define P_SENS_BIAS (50 - h->param.i_bframe_bias)
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frames[1]->i_type = X264_TYPE_B;
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for( j = 2; j <= X264_MIN( h->param.i_bframe, num_frames-1 ); j++ )
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int pthresh = X264_MAX(INTER_THRESH - P_SENS_BIAS * (j-1), INTER_THRESH/10);
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int pcost = x264_slicetype_frame_cost( h, &a, frames, 0, j+1, j+1, 1 );
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// fprintf( stderr, "frm%d+%d: %d <=> %d, I:%d/%d \n",
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// frames[0]->i_frame, j-1, pthresh, pcost/i_mb_count,
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// frames[j+1]->i_intra_mbs[j+1], i_mb_count );
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if( pcost > pthresh*i_mb_count || frames[j+1]->i_intra_mbs[j+1] > i_mb_count/3 )
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frames[j]->i_type = X264_TYPE_P;
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frames[j]->i_type = X264_TYPE_B;
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void x264_slicetype_decide( x264_t *h )
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if( h->frames.next[0] == NULL )
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if( h->param.rc.b_stat_read )
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/* Use the frame types from the first pass */
449
for( i = 0; h->frames.next[i] != NULL; i++ )
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h->frames.next[i]->i_type =
451
x264_ratecontrol_slice_type( h, h->frames.next[i]->i_frame );
453
else if( (h->param.i_bframe && h->param.b_bframe_adaptive)
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|| h->param.b_pre_scenecut )
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x264_slicetype_analyse( h );
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for( bframes = 0;; bframes++ )
459
frm = h->frames.next[bframes];
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if( frm->i_frame - h->frames.i_last_idr >= h->param.i_keyint_max )
464
if( frm->i_type == X264_TYPE_AUTO )
465
frm->i_type = X264_TYPE_IDR;
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if( frm->i_type != X264_TYPE_IDR )
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x264_log( h, X264_LOG_WARNING, "specified frame type (%d) is not compatible with keyframe interval\n", frm->i_type );
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if( frm->i_type == X264_TYPE_IDR )
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h->frames.next[bframes]->i_type = X264_TYPE_P;
483
if( bframes == h->param.i_bframe
484
|| h->frames.next[bframes+1] == NULL )
486
if( IS_X264_TYPE_B( frm->i_type ) )
487
x264_log( h, X264_LOG_WARNING, "specified frame type is not compatible with max B-frames\n" );
488
if( frm->i_type == X264_TYPE_AUTO
489
|| IS_X264_TYPE_B( frm->i_type ) )
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frm->i_type = X264_TYPE_P;
493
if( frm->i_type != X264_TYPE_AUTO && frm->i_type != X264_TYPE_B && frm->i_type != X264_TYPE_BREF )
496
frm->i_type = X264_TYPE_B;
500
int x264_rc_analyse_slice( x264_t *h )
502
x264_mb_analysis_t a;
503
x264_frame_t *frames[X264_BFRAME_MAX+2] = { NULL, };
507
x264_lowres_context_init( h, &a );
509
if( IS_X264_TYPE_I(h->fenc->i_type) )
513
else if( X264_TYPE_P == h->fenc->i_type )
516
while( h->frames.current[p1] && IS_X264_TYPE_B( h->frames.current[p1]->i_type ) )
523
p1 = (h->fref1[0]->i_poc - h->fref0[0]->i_poc)/2;
524
b = (h->fref1[0]->i_poc - h->fenc->i_poc)/2;
525
frames[p1] = h->fref1[0];
527
frames[p0] = h->fref0[0];
530
cost = x264_slicetype_frame_cost( h, &a, frames, p0, p1, b, 0 );
531
h->fenc->i_row_satd = h->fenc->i_row_satds[b-p0][p1-b];
532
h->fdec->i_row_satd = h->fdec->i_row_satds[b-p0][p1-b];
533
h->fdec->i_satd = cost;
534
memcpy( h->fdec->i_row_satd, h->fenc->i_row_satd, h->sps->i_mb_height * sizeof(int) );