2 * H263/MPEG4 backend for encoder and decoder
3 * Copyright (c) 2000,2001 Fabrice Bellard
5 * Copyright (c) 2001 Juan J. Sierralta P
6 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
8 * This file is part of FFmpeg.
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
35 #include "mpegvideo.h"
41 #include "mpeg4video.h"
46 uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
49 void ff_h263_update_motion_val(MpegEncContext * s){
50 const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
51 //FIXME a lot of that is only needed for !low_delay
52 const int wrap = s->b8_stride;
53 const int xy = s->block_index[0];
55 s->current_picture.f.mbskip_table[mb_xy] = s->mb_skipped;
57 if(s->mv_type != MV_TYPE_8X8){
58 int motion_x, motion_y;
62 } else if (s->mv_type == MV_TYPE_16X16) {
63 motion_x = s->mv[0][0][0];
64 motion_y = s->mv[0][0][1];
65 } else /*if (s->mv_type == MV_TYPE_FIELD)*/ {
67 motion_x = s->mv[0][0][0] + s->mv[0][1][0];
68 motion_y = s->mv[0][0][1] + s->mv[0][1][1];
69 motion_x = (motion_x>>1) | (motion_x&1);
71 s->p_field_mv_table[i][0][mb_xy][0]= s->mv[0][i][0];
72 s->p_field_mv_table[i][0][mb_xy][1]= s->mv[0][i][1];
74 s->current_picture.f.ref_index[0][4*mb_xy ] =
75 s->current_picture.f.ref_index[0][4*mb_xy + 1] = s->field_select[0][0];
76 s->current_picture.f.ref_index[0][4*mb_xy + 2] =
77 s->current_picture.f.ref_index[0][4*mb_xy + 3] = s->field_select[0][1];
80 /* no update if 8X8 because it has been done during parsing */
81 s->current_picture.f.motion_val[0][xy][0] = motion_x;
82 s->current_picture.f.motion_val[0][xy][1] = motion_y;
83 s->current_picture.f.motion_val[0][xy + 1][0] = motion_x;
84 s->current_picture.f.motion_val[0][xy + 1][1] = motion_y;
85 s->current_picture.f.motion_val[0][xy + wrap][0] = motion_x;
86 s->current_picture.f.motion_val[0][xy + wrap][1] = motion_y;
87 s->current_picture.f.motion_val[0][xy + 1 + wrap][0] = motion_x;
88 s->current_picture.f.motion_val[0][xy + 1 + wrap][1] = motion_y;
91 if(s->encoding){ //FIXME encoding MUST be cleaned up
92 if (s->mv_type == MV_TYPE_8X8)
93 s->current_picture.f.mb_type[mb_xy] = MB_TYPE_L0 | MB_TYPE_8x8;
95 s->current_picture.f.mb_type[mb_xy] = MB_TYPE_INTRA;
97 s->current_picture.f.mb_type[mb_xy] = MB_TYPE_L0 | MB_TYPE_16x16;
101 int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr)
103 int x, y, wrap, a, c, pred_dc;
106 /* find prediction */
108 x = 2 * s->mb_x + (n & 1);
109 y = 2 * s->mb_y + ((n & 2) >> 1);
111 dc_val = s->dc_val[0];
116 dc_val = s->dc_val[n - 4 + 1];
121 a = dc_val[(x - 1) + (y) * wrap];
122 c = dc_val[(x) + (y - 1) * wrap];
124 /* No prediction outside GOB boundary */
125 if(s->first_slice_line && n!=3){
127 if(n!=1 && s->mb_x == s->resync_mb_x) a= 1024;
129 /* just DC prediction */
130 if (a != 1024 && c != 1024)
131 pred_dc = (a + c) >> 1;
137 /* we assume pred is positive */
138 *dc_val_ptr = &dc_val[x + y * wrap];
142 void ff_h263_loop_filter(MpegEncContext * s){
144 const int linesize = s->linesize;
145 const int uvlinesize= s->uvlinesize;
146 const int xy = s->mb_y * s->mb_stride + s->mb_x;
147 uint8_t *dest_y = s->dest[0];
148 uint8_t *dest_cb= s->dest[1];
149 uint8_t *dest_cr= s->dest[2];
151 // if(s->pict_type==AV_PICTURE_TYPE_B && !s->readable) return;
157 if (!IS_SKIP(s->current_picture.f.mb_type[xy])) {
159 s->dsp.h263_v_loop_filter(dest_y+8*linesize , linesize, qp_c);
160 s->dsp.h263_v_loop_filter(dest_y+8*linesize+8, linesize, qp_c);
165 int qp_dt, qp_tt, qp_tc;
167 if (IS_SKIP(s->current_picture.f.mb_type[xy - s->mb_stride]))
170 qp_tt = s->current_picture.f.qscale_table[xy - s->mb_stride];
178 const int chroma_qp= s->chroma_qscale_table[qp_tc];
179 s->dsp.h263_v_loop_filter(dest_y , linesize, qp_tc);
180 s->dsp.h263_v_loop_filter(dest_y+8, linesize, qp_tc);
182 s->dsp.h263_v_loop_filter(dest_cb , uvlinesize, chroma_qp);
183 s->dsp.h263_v_loop_filter(dest_cr , uvlinesize, chroma_qp);
187 s->dsp.h263_h_loop_filter(dest_y-8*linesize+8 , linesize, qp_tt);
190 if (qp_tt || IS_SKIP(s->current_picture.f.mb_type[xy - 1 - s->mb_stride]))
193 qp_dt = s->current_picture.f.qscale_table[xy - 1 - s->mb_stride];
196 const int chroma_qp= s->chroma_qscale_table[qp_dt];
197 s->dsp.h263_h_loop_filter(dest_y -8*linesize , linesize, qp_dt);
198 s->dsp.h263_h_loop_filter(dest_cb-8*uvlinesize, uvlinesize, chroma_qp);
199 s->dsp.h263_h_loop_filter(dest_cr-8*uvlinesize, uvlinesize, chroma_qp);
205 s->dsp.h263_h_loop_filter(dest_y +8, linesize, qp_c);
206 if(s->mb_y + 1 == s->mb_height)
207 s->dsp.h263_h_loop_filter(dest_y+8*linesize+8, linesize, qp_c);
212 if (qp_c || IS_SKIP(s->current_picture.f.mb_type[xy - 1]))
215 qp_lc = s->current_picture.f.qscale_table[xy - 1];
218 s->dsp.h263_h_loop_filter(dest_y, linesize, qp_lc);
219 if(s->mb_y + 1 == s->mb_height){
220 const int chroma_qp= s->chroma_qscale_table[qp_lc];
221 s->dsp.h263_h_loop_filter(dest_y +8* linesize, linesize, qp_lc);
222 s->dsp.h263_h_loop_filter(dest_cb , uvlinesize, chroma_qp);
223 s->dsp.h263_h_loop_filter(dest_cr , uvlinesize, chroma_qp);
229 void ff_h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n)
231 int x, y, wrap, a, c, pred_dc, scale, i;
232 int16_t *dc_val, *ac_val, *ac_val1;
234 /* find prediction */
236 x = 2 * s->mb_x + (n & 1);
237 y = 2 * s->mb_y + (n>> 1);
239 dc_val = s->dc_val[0];
240 ac_val = s->ac_val[0][0];
241 scale = s->y_dc_scale;
246 dc_val = s->dc_val[n - 4 + 1];
247 ac_val = s->ac_val[n - 4 + 1][0];
248 scale = s->c_dc_scale;
251 ac_val += ((y) * wrap + (x)) * 16;
257 a = dc_val[(x - 1) + (y) * wrap];
258 c = dc_val[(x) + (y - 1) * wrap];
260 /* No prediction outside GOB boundary */
261 if(s->first_slice_line && n!=3){
263 if(n!=1 && s->mb_x == s->resync_mb_x) a= 1024;
268 if (s->h263_aic_dir) {
269 /* left prediction */
273 block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
282 block[s->dsp.idct_permutation[i ]] += ac_val[i + 8];
288 /* just DC prediction */
289 if (a != 1024 && c != 1024)
290 pred_dc = (a + c) >> 1;
297 /* we assume pred is positive */
298 block[0]=block[0]*scale + pred_dc;
305 /* Update AC/DC tables */
306 dc_val[(x) + (y) * wrap] = block[0];
310 ac_val1[i ] = block[s->dsp.idct_permutation[i<<3]];
313 ac_val1[8 + i] = block[s->dsp.idct_permutation[i ]];
316 int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,
320 int16_t *A, *B, *C, (*mot_val)[2];
321 static const int off[4]= {2, 1, 1, -1};
324 mot_val = s->current_picture.f.motion_val[dir] + s->block_index[block];
327 /* special case for first (slice) line */
328 if (s->first_slice_line && block<3) {
329 // we can't just change some MVs to simulate that as we need them for the B frames (and ME)
330 // and if we ever support non rectangular objects than we need to do a few ifs here anyway :(
331 if(block==0){ //most common case
332 if(s->mb_x == s->resync_mb_x){ //rare
334 }else if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare
335 C = mot_val[off[block] - wrap];
340 *px = mid_pred(A[0], 0, C[0]);
341 *py = mid_pred(A[1], 0, C[1]);
348 if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare
349 C = mot_val[off[block] - wrap];
350 *px = mid_pred(A[0], 0, C[0]);
351 *py = mid_pred(A[1], 0, C[1]);
357 B = mot_val[ - wrap];
358 C = mot_val[off[block] - wrap];
359 if(s->mb_x == s->resync_mb_x) //rare
362 *px = mid_pred(A[0], B[0], C[0]);
363 *py = mid_pred(A[1], B[1], C[1]);
366 B = mot_val[ - wrap];
367 C = mot_val[off[block] - wrap];
368 *px = mid_pred(A[0], B[0], C[0]);
369 *py = mid_pred(A[1], B[1], C[1]);
376 * Get the GOB height based on picture height.
378 int ff_h263_get_gob_height(MpegEncContext *s){
379 if (s->height <= 400)
381 else if (s->height <= 800)