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/*
* MPEG4 decoder / encoder common code.
* Copyright (c) 2000,2001 Fabrice Bellard
* Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "mpegvideo.h"
#include "mpeg4video.h"
#include "mpeg4data.h"
uint8_t ff_mpeg4_static_rl_table_store[3][2][2*MAX_RUN + MAX_LEVEL + 3];
int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s){
switch(s->pict_type){
case FF_I_TYPE:
return 16;
case FF_P_TYPE:
case FF_S_TYPE:
return s->f_code+15;
case FF_B_TYPE:
return FFMAX3(s->f_code, s->b_code, 2) + 15;
default:
return -1;
}
}
void ff_mpeg4_clean_buffers(MpegEncContext *s)
{
int c_wrap, c_xy, l_wrap, l_xy;
l_wrap= s->b8_stride;
l_xy= (2*s->mb_y-1)*l_wrap + s->mb_x*2 - 1;
c_wrap= s->mb_stride;
c_xy= (s->mb_y-1)*c_wrap + s->mb_x - 1;
#if 0
/* clean DC */
memsetw(s->dc_val[0] + l_xy, 1024, l_wrap*2+1);
memsetw(s->dc_val[1] + c_xy, 1024, c_wrap+1);
memsetw(s->dc_val[2] + c_xy, 1024, c_wrap+1);
#endif
/* clean AC */
memset(s->ac_val[0] + l_xy, 0, (l_wrap*2+1)*16*sizeof(int16_t));
memset(s->ac_val[1] + c_xy, 0, (c_wrap +1)*16*sizeof(int16_t));
memset(s->ac_val[2] + c_xy, 0, (c_wrap +1)*16*sizeof(int16_t));
/* clean MV */
// we can't clear the MVs as they might be needed by a b frame
// memset(s->motion_val + l_xy, 0, (l_wrap*2+1)*2*sizeof(int16_t));
// memset(s->motion_val, 0, 2*sizeof(int16_t)*(2 + s->mb_width*2)*(2 + s->mb_height*2));
s->last_mv[0][0][0]=
s->last_mv[0][0][1]=
s->last_mv[1][0][0]=
s->last_mv[1][0][1]= 0;
}
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