/* * H263/MPEG4 backend for ffmpeg encoder and decoder * Copyright (c) 2000,2001 Fabrice Bellard * H263+ support. * Copyright (c) 2001 Juan J. Sierralta P * Copyright (c) 2002-2004 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 */ /** * @file * h263/mpeg4 codec. */ //#define DEBUG #include <limits.h> #include "dsputil.h" #include "avcodec.h" #include "mpegvideo.h" #include "h263.h" #include "h263data.h" #include "mathops.h" #include "unary.h" #include "flv.h" #include "mpeg4video.h" //#undef NDEBUG //#include <assert.h> uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3]; void ff_h263_update_motion_val(MpegEncContext * s){ const int mb_xy = s->mb_y * s->mb_stride + s->mb_x; //FIXME a lot of that is only needed for !low_delay const int wrap = s->b8_stride; const int xy = s->block_index[0]; s->current_picture.mbskip_table[mb_xy]= s->mb_skipped; if(s->mv_type != MV_TYPE_8X8){ int motion_x, motion_y; if (s->mb_intra) { motion_x = 0; motion_y = 0; } else if (s->mv_type == MV_TYPE_16X16) { motion_x = s->mv[0][0][0]; motion_y = s->mv[0][0][1]; } else /*if (s->mv_type == MV_TYPE_FIELD)*/ { int i; motion_x = s->mv[0][0][0] + s->mv[0][1][0]; motion_y = s->mv[0][0][1] + s->mv[0][1][1]; motion_x = (motion_x>>1) | (motion_x&1); for(i=0; i<2; i++){ s->p_field_mv_table[i][0][mb_xy][0]= s->mv[0][i][0]; s->p_field_mv_table[i][0][mb_xy][1]= s->mv[0][i][1]; } s->current_picture.ref_index[0][4*mb_xy ]= s->current_picture.ref_index[0][4*mb_xy + 1]= s->field_select[0][0]; s->current_picture.ref_index[0][4*mb_xy + 2]= s->current_picture.ref_index[0][4*mb_xy + 3]= s->field_select[0][1]; } /* no update if 8X8 because it has been done during parsing */ s->current_picture.motion_val[0][xy][0] = motion_x; s->current_picture.motion_val[0][xy][1] = motion_y; s->current_picture.motion_val[0][xy + 1][0] = motion_x; s->current_picture.motion_val[0][xy + 1][1] = motion_y; s->current_picture.motion_val[0][xy + wrap][0] = motion_x; s->current_picture.motion_val[0][xy + wrap][1] = motion_y; s->current_picture.motion_val[0][xy + 1 + wrap][0] = motion_x; s->current_picture.motion_val[0][xy + 1 + wrap][1] = motion_y; } if(s->encoding){ //FIXME encoding MUST be cleaned up if (s->mv_type == MV_TYPE_8X8) s->current_picture.mb_type[mb_xy]= MB_TYPE_L0 | MB_TYPE_8x8; else if(s->mb_intra) s->current_picture.mb_type[mb_xy]= MB_TYPE_INTRA; else s->current_picture.mb_type[mb_xy]= MB_TYPE_L0 | MB_TYPE_16x16; } } int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr) { int x, y, wrap, a, c, pred_dc; int16_t *dc_val; /* find prediction */ if (n < 4) { x = 2 * s->mb_x + (n & 1); y = 2 * s->mb_y + ((n & 2) >> 1); wrap = s->b8_stride; dc_val = s->dc_val[0]; } else { x = s->mb_x; y = s->mb_y; wrap = s->mb_stride; dc_val = s->dc_val[n - 4 + 1]; } /* B C * A X */ a = dc_val[(x - 1) + (y) * wrap]; c = dc_val[(x) + (y - 1) * wrap]; /* No prediction outside GOB boundary */ if(s->first_slice_line && n!=3){ if(n!=2) c= 1024; if(n!=1 && s->mb_x == s->resync_mb_x) a= 1024; } /* just DC prediction */ if (a != 1024 && c != 1024) pred_dc = (a + c) >> 1; else if (a != 1024) pred_dc = a; else pred_dc = c; /* we assume pred is positive */ *dc_val_ptr = &dc_val[x + y * wrap]; return pred_dc; } void ff_h263_loop_filter(MpegEncContext * s){ int qp_c; const int linesize = s->linesize; const int uvlinesize= s->uvlinesize; const int xy = s->mb_y * s->mb_stride + s->mb_x; uint8_t *dest_y = s->dest[0]; uint8_t *dest_cb= s->dest[1]; uint8_t *dest_cr= s->dest[2]; // if(s->pict_type==FF_B_TYPE && !s->readable) return; /* Diag Top Left Center */ if(!IS_SKIP(s->current_picture.mb_type[xy])){ qp_c= s->qscale; s->dsp.h263_v_loop_filter(dest_y+8*linesize , linesize, qp_c); s->dsp.h263_v_loop_filter(dest_y+8*linesize+8, linesize, qp_c); }else qp_c= 0; if(s->mb_y){ int qp_dt, qp_tt, qp_tc; if(IS_SKIP(s->current_picture.mb_type[xy-s->mb_stride])) qp_tt=0; else qp_tt= s->current_picture.qscale_table[xy-s->mb_stride]; if(qp_c) qp_tc= qp_c; else qp_tc= qp_tt; if(qp_tc){ const int chroma_qp= s->chroma_qscale_table[qp_tc]; s->dsp.h263_v_loop_filter(dest_y , linesize, qp_tc); s->dsp.h263_v_loop_filter(dest_y+8, linesize, qp_tc); s->dsp.h263_v_loop_filter(dest_cb , uvlinesize, chroma_qp); s->dsp.h263_v_loop_filter(dest_cr , uvlinesize, chroma_qp); } if(qp_tt) s->dsp.h263_h_loop_filter(dest_y-8*linesize+8 , linesize, qp_tt); if(s->mb_x){ if(qp_tt || IS_SKIP(s->current_picture.mb_type[xy-1-s->mb_stride])) qp_dt= qp_tt; else qp_dt= s->current_picture.qscale_table[xy-1-s->mb_stride]; if(qp_dt){ const int chroma_qp= s->chroma_qscale_table[qp_dt]; s->dsp.h263_h_loop_filter(dest_y -8*linesize , linesize, qp_dt); s->dsp.h263_h_loop_filter(dest_cb-8*uvlinesize, uvlinesize, chroma_qp); s->dsp.h263_h_loop_filter(dest_cr-8*uvlinesize, uvlinesize, chroma_qp); } } } if(qp_c){ s->dsp.h263_h_loop_filter(dest_y +8, linesize, qp_c); if(s->mb_y + 1 == s->mb_height) s->dsp.h263_h_loop_filter(dest_y+8*linesize+8, linesize, qp_c); } if(s->mb_x){ int qp_lc; if(qp_c || IS_SKIP(s->current_picture.mb_type[xy-1])) qp_lc= qp_c; else qp_lc= s->current_picture.qscale_table[xy-1]; if(qp_lc){ s->dsp.h263_h_loop_filter(dest_y, linesize, qp_lc); if(s->mb_y + 1 == s->mb_height){ const int chroma_qp= s->chroma_qscale_table[qp_lc]; s->dsp.h263_h_loop_filter(dest_y +8* linesize, linesize, qp_lc); s->dsp.h263_h_loop_filter(dest_cb , uvlinesize, chroma_qp); s->dsp.h263_h_loop_filter(dest_cr , uvlinesize, chroma_qp); } } } } void h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n) { int x, y, wrap, a, c, pred_dc, scale, i; int16_t *dc_val, *ac_val, *ac_val1; /* find prediction */ if (n < 4) { x = 2 * s->mb_x + (n & 1); y = 2 * s->mb_y + (n>> 1); wrap = s->b8_stride; dc_val = s->dc_val[0]; ac_val = s->ac_val[0][0]; scale = s->y_dc_scale; } else { x = s->mb_x; y = s->mb_y; wrap = s->mb_stride; dc_val = s->dc_val[n - 4 + 1]; ac_val = s->ac_val[n - 4 + 1][0]; scale = s->c_dc_scale; } ac_val += ((y) * wrap + (x)) * 16; ac_val1 = ac_val; /* B C * A X */ a = dc_val[(x - 1) + (y) * wrap]; c = dc_val[(x) + (y - 1) * wrap]; /* No prediction outside GOB boundary */ if(s->first_slice_line && n!=3){ if(n!=2) c= 1024; if(n!=1 && s->mb_x == s->resync_mb_x) a= 1024; } if (s->ac_pred) { pred_dc = 1024; if (s->h263_aic_dir) { /* left prediction */ if (a != 1024) { ac_val -= 16; for(i=1;i<8;i++) { block[s->dsp.idct_permutation[i<<3]] += ac_val[i]; } pred_dc = a; } } else { /* top prediction */ if (c != 1024) { ac_val -= 16 * wrap; for(i=1;i<8;i++) { block[s->dsp.idct_permutation[i ]] += ac_val[i + 8]; } pred_dc = c; } } } else { /* just DC prediction */ if (a != 1024 && c != 1024) pred_dc = (a + c) >> 1; else if (a != 1024) pred_dc = a; else pred_dc = c; } /* we assume pred is positive */ block[0]=block[0]*scale + pred_dc; if (block[0] < 0) block[0] = 0; else block[0] |= 1; /* Update AC/DC tables */ dc_val[(x) + (y) * wrap] = block[0]; /* left copy */ for(i=1;i<8;i++) ac_val1[i ] = block[s->dsp.idct_permutation[i<<3]]; /* top copy */ for(i=1;i<8;i++) ac_val1[8 + i] = block[s->dsp.idct_permutation[i ]]; } int16_t *h263_pred_motion(MpegEncContext * s, int block, int dir, int *px, int *py) { int wrap; int16_t *A, *B, *C, (*mot_val)[2]; static const int off[4]= {2, 1, 1, -1}; wrap = s->b8_stride; mot_val = s->current_picture.motion_val[dir] + s->block_index[block]; A = mot_val[ - 1]; /* special case for first (slice) line */ if (s->first_slice_line && block<3) { // we can't just change some MVs to simulate that as we need them for the B frames (and ME) // and if we ever support non rectangular objects than we need to do a few ifs here anyway :( if(block==0){ //most common case if(s->mb_x == s->resync_mb_x){ //rare *px= *py = 0; }else if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare C = mot_val[off[block] - wrap]; if(s->mb_x==0){ *px = C[0]; *py = C[1]; }else{ *px = mid_pred(A[0], 0, C[0]); *py = mid_pred(A[1], 0, C[1]); } }else{ *px = A[0]; *py = A[1]; } }else if(block==1){ if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare C = mot_val[off[block] - wrap]; *px = mid_pred(A[0], 0, C[0]); *py = mid_pred(A[1], 0, C[1]); }else{ *px = A[0]; *py = A[1]; } }else{ /* block==2*/ B = mot_val[ - wrap]; C = mot_val[off[block] - wrap]; if(s->mb_x == s->resync_mb_x) //rare A[0]=A[1]=0; *px = mid_pred(A[0], B[0], C[0]); *py = mid_pred(A[1], B[1], C[1]); } } else { B = mot_val[ - wrap]; C = mot_val[off[block] - wrap]; *px = mid_pred(A[0], B[0], C[0]); *py = mid_pred(A[1], B[1], C[1]); } return *mot_val; } /** * Get the GOB height based on picture height. */ int ff_h263_get_gob_height(MpegEncContext *s){ if (s->height <= 400) return 1; else if (s->height <= 800) return 2; else return 4; }