| /* |
| * H263/MPEG4 backend for 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 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 |
| */ |
| |
| /** |
| * @file |
| * h263/mpeg4 codec. |
| */ |
| |
| #include <limits.h> |
| |
| #include "avcodec.h" |
| #include "mpegvideo.h" |
| #include "h263.h" |
| #include "h263data.h" |
| #include "mathops.h" |
| #include "mpegutils.h" |
| #include "unary.h" |
| #include "flv.h" |
| #include "mpeg4video.h" |
| |
| |
| 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 ff_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==AV_PICTURE_TYPE_B && !s->readable) return; |
| |
| /* |
| Diag Top |
| Left Center |
| */ |
| if (!IS_SKIP(s->current_picture.mb_type[xy])) { |
| qp_c= s->qscale; |
| s->h263dsp.h263_v_loop_filter(dest_y + 8 * linesize, linesize, qp_c); |
| s->h263dsp.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->h263dsp.h263_v_loop_filter(dest_y, linesize, qp_tc); |
| s->h263dsp.h263_v_loop_filter(dest_y + 8, linesize, qp_tc); |
| |
| s->h263dsp.h263_v_loop_filter(dest_cb, uvlinesize, chroma_qp); |
| s->h263dsp.h263_v_loop_filter(dest_cr, uvlinesize, chroma_qp); |
| } |
| |
| if(qp_tt) |
| s->h263dsp.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->h263dsp.h263_h_loop_filter(dest_y - 8 * linesize, linesize, qp_dt); |
| s->h263dsp.h263_h_loop_filter(dest_cb - 8 * uvlinesize, uvlinesize, chroma_qp); |
| s->h263dsp.h263_h_loop_filter(dest_cr - 8 * uvlinesize, uvlinesize, chroma_qp); |
| } |
| } |
| } |
| |
| if(qp_c){ |
| s->h263dsp.h263_h_loop_filter(dest_y + 8, linesize, qp_c); |
| if(s->mb_y + 1 == s->mb_height) |
| s->h263dsp.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->h263dsp.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->h263dsp.h263_h_loop_filter(dest_y + 8 * linesize, linesize, qp_lc); |
| s->h263dsp.h263_h_loop_filter(dest_cb, uvlinesize, chroma_qp); |
| s->h263dsp.h263_h_loop_filter(dest_cr, uvlinesize, chroma_qp); |
| } |
| } |
| } |
| } |
| |
| void ff_h263_pred_acdc(MpegEncContext * s, int16_t *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->idsp.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->idsp.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->idsp.idct_permutation[i << 3]]; |
| /* top copy */ |
| for(i=1;i<8;i++) |
| ac_val1[8 + i] = block[s->idsp.idct_permutation[i]]; |
| } |
| |
| int16_t *ff_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; |
| } |
