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https://git.videolan.org/git/ffmpeg.git
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73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
/*
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* MPEG4 decoder / encoder common code.
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* Copyright (c) 2000,2001 Fabrice Bellard
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* Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
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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 "mpegvideo.h"
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#include "mpeg4video.h"
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#include "mpeg4data.h"
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uint8_t ff_mpeg4_static_rl_table_store[3][2][2*MAX_RUN + MAX_LEVEL + 3];
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int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s){
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switch(s->pict_type){
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case FF_I_TYPE:
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return 16;
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case FF_P_TYPE:
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case FF_S_TYPE:
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return s->f_code+15;
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case FF_B_TYPE:
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return FFMAX3(s->f_code, s->b_code, 2) + 15;
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default:
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return -1;
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}
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}
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void ff_mpeg4_clean_buffers(MpegEncContext *s)
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{
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int c_wrap, c_xy, l_wrap, l_xy;
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l_wrap= s->b8_stride;
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l_xy= (2*s->mb_y-1)*l_wrap + s->mb_x*2 - 1;
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c_wrap= s->mb_stride;
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c_xy= (s->mb_y-1)*c_wrap + s->mb_x - 1;
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#if 0
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/* clean DC */
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memsetw(s->dc_val[0] + l_xy, 1024, l_wrap*2+1);
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memsetw(s->dc_val[1] + c_xy, 1024, c_wrap+1);
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memsetw(s->dc_val[2] + c_xy, 1024, c_wrap+1);
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#endif
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/* clean AC */
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memset(s->ac_val[0] + l_xy, 0, (l_wrap*2+1)*16*sizeof(int16_t));
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memset(s->ac_val[1] + c_xy, 0, (c_wrap +1)*16*sizeof(int16_t));
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memset(s->ac_val[2] + c_xy, 0, (c_wrap +1)*16*sizeof(int16_t));
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/* clean MV */
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// we can't clear the MVs as they might be needed by a b frame
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// memset(s->motion_val + l_xy, 0, (l_wrap*2+1)*2*sizeof(int16_t));
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// memset(s->motion_val, 0, 2*sizeof(int16_t)*(2 + s->mb_width*2)*(2 + s->mb_height*2));
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s->last_mv[0][0][0]=
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s->last_mv[0][0][1]=
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s->last_mv[1][0][0]=
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s->last_mv[1][0][1]= 0;
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}
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