/* * 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 Libav. * * Libav 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. * * Libav 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 Libav; 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 AV_PICTURE_TYPE_I: return 16; case AV_PICTURE_TYPE_P: case AV_PICTURE_TYPE_S: return s->f_code+15; case AV_PICTURE_TYPE_B: 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; } #define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0])) #define tab_bias (tab_size/2) //used by mpeg4 and rv10 decoder void ff_mpeg4_init_direct_mv(MpegEncContext *s){ int i; for(i=0; i<tab_size; i++){ s->direct_scale_mv[0][i] = (i-tab_bias)*s->pb_time/s->pp_time; s->direct_scale_mv[1][i] = (i-tab_bias)*(s->pb_time-s->pp_time)/s->pp_time; } } static inline void ff_mpeg4_set_one_direct_mv(MpegEncContext *s, int mx, int my, int i){ int xy= s->block_index[i]; uint16_t time_pp= s->pp_time; uint16_t time_pb= s->pb_time; int p_mx, p_my; p_mx = s->next_picture.f.motion_val[0][xy][0]; if((unsigned)(p_mx + tab_bias) < tab_size){ s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias] + mx; s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx : s->direct_scale_mv[1][p_mx + tab_bias]; }else{ s->mv[0][i][0] = p_mx*time_pb/time_pp + mx; s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx : p_mx*(time_pb - time_pp)/time_pp; } p_my = s->next_picture.f.motion_val[0][xy][1]; if((unsigned)(p_my + tab_bias) < tab_size){ s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias] + my; s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my : s->direct_scale_mv[1][p_my + tab_bias]; }else{ s->mv[0][i][1] = p_my*time_pb/time_pp + my; s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my : p_my*(time_pb - time_pp)/time_pp; } } #undef tab_size #undef tab_bias /** * * @return the mb_type */ int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my){ const int mb_index= s->mb_x + s->mb_y*s->mb_stride; const int colocated_mb_type = s->next_picture.f.mb_type[mb_index]; uint16_t time_pp; uint16_t time_pb; int i; //FIXME avoid divides // try special case with shifts for 1 and 3 B-frames? if(IS_8X8(colocated_mb_type)){ s->mv_type = MV_TYPE_8X8; for(i=0; i<4; i++){ ff_mpeg4_set_one_direct_mv(s, mx, my, i); } return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_L0L1; } else if(IS_INTERLACED(colocated_mb_type)){ s->mv_type = MV_TYPE_FIELD; for(i=0; i<2; i++){ int field_select = s->next_picture.f.ref_index[0][4 * mb_index + 2 * i]; s->field_select[0][i]= field_select; s->field_select[1][i]= i; if(s->top_field_first){ time_pp= s->pp_field_time - field_select + i; time_pb= s->pb_field_time - field_select + i; }else{ time_pp= s->pp_field_time + field_select - i; time_pb= s->pb_field_time + field_select - i; } s->mv[0][i][0] = s->p_field_mv_table[i][0][mb_index][0]*time_pb/time_pp + mx; s->mv[0][i][1] = s->p_field_mv_table[i][0][mb_index][1]*time_pb/time_pp + my; s->mv[1][i][0] = mx ? s->mv[0][i][0] - s->p_field_mv_table[i][0][mb_index][0] : s->p_field_mv_table[i][0][mb_index][0]*(time_pb - time_pp)/time_pp; s->mv[1][i][1] = my ? s->mv[0][i][1] - s->p_field_mv_table[i][0][mb_index][1] : s->p_field_mv_table[i][0][mb_index][1]*(time_pb - time_pp)/time_pp; } return MB_TYPE_DIRECT2 | MB_TYPE_16x8 | MB_TYPE_L0L1 | MB_TYPE_INTERLACED; }else{ ff_mpeg4_set_one_direct_mv(s, mx, my, 0); s->mv[0][1][0] = s->mv[0][2][0] = s->mv[0][3][0] = s->mv[0][0][0]; s->mv[0][1][1] = s->mv[0][2][1] = s->mv[0][3][1] = s->mv[0][0][1]; s->mv[1][1][0] = s->mv[1][2][0] = s->mv[1][3][0] = s->mv[1][0][0]; s->mv[1][1][1] = s->mv[1][2][1] = s->mv[1][3][1] = s->mv[1][0][1]; if((s->avctx->workaround_bugs & FF_BUG_DIRECT_BLOCKSIZE) || !s->quarter_sample) s->mv_type= MV_TYPE_16X16; else s->mv_type= MV_TYPE_8X8; return MB_TYPE_DIRECT2 | MB_TYPE_16x16 | MB_TYPE_L0L1; //Note see prev line } }