lavc decoders: work with refcounted frames.
[libav.git] / libavcodec / h263.c
1 /*
2 * H263/MPEG4 backend for encoder and decoder
3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * H263+ support.
5 * Copyright (c) 2001 Juan J. Sierralta P
6 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
7 *
8 * This file is part of Libav.
9 *
10 * Libav 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.
14 *
15 * Libav 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.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with Libav; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 /**
26 * @file
27 * h263/mpeg4 codec.
28 */
29
30 //#define DEBUG
31 #include <limits.h>
32
33 #include "avcodec.h"
34 #include "mpegvideo.h"
35 #include "h263.h"
36 #include "h263data.h"
37 #include "mathops.h"
38 #include "unary.h"
39 #include "flv.h"
40 #include "mpeg4video.h"
41
42 //#undef NDEBUG
43 //#include <assert.h>
44
45 uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
46
47
48 void ff_h263_update_motion_val(MpegEncContext * s){
49 const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
50 //FIXME a lot of that is only needed for !low_delay
51 const int wrap = s->b8_stride;
52 const int xy = s->block_index[0];
53
54 s->current_picture.mbskip_table[mb_xy] = s->mb_skipped;
55
56 if(s->mv_type != MV_TYPE_8X8){
57 int motion_x, motion_y;
58 if (s->mb_intra) {
59 motion_x = 0;
60 motion_y = 0;
61 } else if (s->mv_type == MV_TYPE_16X16) {
62 motion_x = s->mv[0][0][0];
63 motion_y = s->mv[0][0][1];
64 } else /*if (s->mv_type == MV_TYPE_FIELD)*/ {
65 int i;
66 motion_x = s->mv[0][0][0] + s->mv[0][1][0];
67 motion_y = s->mv[0][0][1] + s->mv[0][1][1];
68 motion_x = (motion_x>>1) | (motion_x&1);
69 for(i=0; i<2; i++){
70 s->p_field_mv_table[i][0][mb_xy][0]= s->mv[0][i][0];
71 s->p_field_mv_table[i][0][mb_xy][1]= s->mv[0][i][1];
72 }
73 s->current_picture.ref_index[0][4*mb_xy ] =
74 s->current_picture.ref_index[0][4*mb_xy + 1] = s->field_select[0][0];
75 s->current_picture.ref_index[0][4*mb_xy + 2] =
76 s->current_picture.ref_index[0][4*mb_xy + 3] = s->field_select[0][1];
77 }
78
79 /* no update if 8X8 because it has been done during parsing */
80 s->current_picture.motion_val[0][xy][0] = motion_x;
81 s->current_picture.motion_val[0][xy][1] = motion_y;
82 s->current_picture.motion_val[0][xy + 1][0] = motion_x;
83 s->current_picture.motion_val[0][xy + 1][1] = motion_y;
84 s->current_picture.motion_val[0][xy + wrap][0] = motion_x;
85 s->current_picture.motion_val[0][xy + wrap][1] = motion_y;
86 s->current_picture.motion_val[0][xy + 1 + wrap][0] = motion_x;
87 s->current_picture.motion_val[0][xy + 1 + wrap][1] = motion_y;
88 }
89
90 if(s->encoding){ //FIXME encoding MUST be cleaned up
91 if (s->mv_type == MV_TYPE_8X8)
92 s->current_picture.mb_type[mb_xy] = MB_TYPE_L0 | MB_TYPE_8x8;
93 else if(s->mb_intra)
94 s->current_picture.mb_type[mb_xy] = MB_TYPE_INTRA;
95 else
96 s->current_picture.mb_type[mb_xy] = MB_TYPE_L0 | MB_TYPE_16x16;
97 }
98 }
99
100 int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr)
101 {
102 int x, y, wrap, a, c, pred_dc;
103 int16_t *dc_val;
104
105 /* find prediction */
106 if (n < 4) {
107 x = 2 * s->mb_x + (n & 1);
108 y = 2 * s->mb_y + ((n & 2) >> 1);
109 wrap = s->b8_stride;
110 dc_val = s->dc_val[0];
111 } else {
112 x = s->mb_x;
113 y = s->mb_y;
114 wrap = s->mb_stride;
115 dc_val = s->dc_val[n - 4 + 1];
116 }
117 /* B C
118 * A X
119 */
120 a = dc_val[(x - 1) + (y) * wrap];
121 c = dc_val[(x) + (y - 1) * wrap];
122
123 /* No prediction outside GOB boundary */
124 if(s->first_slice_line && n!=3){
125 if(n!=2) c= 1024;
126 if(n!=1 && s->mb_x == s->resync_mb_x) a= 1024;
127 }
128 /* just DC prediction */
129 if (a != 1024 && c != 1024)
130 pred_dc = (a + c) >> 1;
131 else if (a != 1024)
132 pred_dc = a;
133 else
134 pred_dc = c;
135
136 /* we assume pred is positive */
137 *dc_val_ptr = &dc_val[x + y * wrap];
138 return pred_dc;
139 }
140
141 void ff_h263_loop_filter(MpegEncContext * s){
142 int qp_c;
143 const int linesize = s->linesize;
144 const int uvlinesize= s->uvlinesize;
145 const int xy = s->mb_y * s->mb_stride + s->mb_x;
146 uint8_t *dest_y = s->dest[0];
147 uint8_t *dest_cb= s->dest[1];
148 uint8_t *dest_cr= s->dest[2];
149
150 // if(s->pict_type==AV_PICTURE_TYPE_B && !s->readable) return;
151
152 /*
153 Diag Top
154 Left Center
155 */
156 if (!IS_SKIP(s->current_picture.mb_type[xy])) {
157 qp_c= s->qscale;
158 s->dsp.h263_v_loop_filter(dest_y+8*linesize , linesize, qp_c);
159 s->dsp.h263_v_loop_filter(dest_y+8*linesize+8, linesize, qp_c);
160 }else
161 qp_c= 0;
162
163 if(s->mb_y){
164 int qp_dt, qp_tt, qp_tc;
165
166 if (IS_SKIP(s->current_picture.mb_type[xy - s->mb_stride]))
167 qp_tt=0;
168 else
169 qp_tt = s->current_picture.qscale_table[xy - s->mb_stride];
170
171 if(qp_c)
172 qp_tc= qp_c;
173 else
174 qp_tc= qp_tt;
175
176 if(qp_tc){
177 const int chroma_qp= s->chroma_qscale_table[qp_tc];
178 s->dsp.h263_v_loop_filter(dest_y , linesize, qp_tc);
179 s->dsp.h263_v_loop_filter(dest_y+8, linesize, qp_tc);
180
181 s->dsp.h263_v_loop_filter(dest_cb , uvlinesize, chroma_qp);
182 s->dsp.h263_v_loop_filter(dest_cr , uvlinesize, chroma_qp);
183 }
184
185 if(qp_tt)
186 s->dsp.h263_h_loop_filter(dest_y-8*linesize+8 , linesize, qp_tt);
187
188 if(s->mb_x){
189 if (qp_tt || IS_SKIP(s->current_picture.mb_type[xy - 1 - s->mb_stride]))
190 qp_dt= qp_tt;
191 else
192 qp_dt = s->current_picture.qscale_table[xy - 1 - s->mb_stride];
193
194 if(qp_dt){
195 const int chroma_qp= s->chroma_qscale_table[qp_dt];
196 s->dsp.h263_h_loop_filter(dest_y -8*linesize , linesize, qp_dt);
197 s->dsp.h263_h_loop_filter(dest_cb-8*uvlinesize, uvlinesize, chroma_qp);
198 s->dsp.h263_h_loop_filter(dest_cr-8*uvlinesize, uvlinesize, chroma_qp);
199 }
200 }
201 }
202
203 if(qp_c){
204 s->dsp.h263_h_loop_filter(dest_y +8, linesize, qp_c);
205 if(s->mb_y + 1 == s->mb_height)
206 s->dsp.h263_h_loop_filter(dest_y+8*linesize+8, linesize, qp_c);
207 }
208
209 if(s->mb_x){
210 int qp_lc;
211 if (qp_c || IS_SKIP(s->current_picture.mb_type[xy - 1]))
212 qp_lc= qp_c;
213 else
214 qp_lc = s->current_picture.qscale_table[xy - 1];
215
216 if(qp_lc){
217 s->dsp.h263_h_loop_filter(dest_y, linesize, qp_lc);
218 if(s->mb_y + 1 == s->mb_height){
219 const int chroma_qp= s->chroma_qscale_table[qp_lc];
220 s->dsp.h263_h_loop_filter(dest_y +8* linesize, linesize, qp_lc);
221 s->dsp.h263_h_loop_filter(dest_cb , uvlinesize, chroma_qp);
222 s->dsp.h263_h_loop_filter(dest_cr , uvlinesize, chroma_qp);
223 }
224 }
225 }
226 }
227
228 void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n)
229 {
230 int x, y, wrap, a, c, pred_dc, scale, i;
231 int16_t *dc_val, *ac_val, *ac_val1;
232
233 /* find prediction */
234 if (n < 4) {
235 x = 2 * s->mb_x + (n & 1);
236 y = 2 * s->mb_y + (n>> 1);
237 wrap = s->b8_stride;
238 dc_val = s->dc_val[0];
239 ac_val = s->ac_val[0][0];
240 scale = s->y_dc_scale;
241 } else {
242 x = s->mb_x;
243 y = s->mb_y;
244 wrap = s->mb_stride;
245 dc_val = s->dc_val[n - 4 + 1];
246 ac_val = s->ac_val[n - 4 + 1][0];
247 scale = s->c_dc_scale;
248 }
249
250 ac_val += ((y) * wrap + (x)) * 16;
251 ac_val1 = ac_val;
252
253 /* B C
254 * A X
255 */
256 a = dc_val[(x - 1) + (y) * wrap];
257 c = dc_val[(x) + (y - 1) * wrap];
258
259 /* No prediction outside GOB boundary */
260 if(s->first_slice_line && n!=3){
261 if(n!=2) c= 1024;
262 if(n!=1 && s->mb_x == s->resync_mb_x) a= 1024;
263 }
264
265 if (s->ac_pred) {
266 pred_dc = 1024;
267 if (s->h263_aic_dir) {
268 /* left prediction */
269 if (a != 1024) {
270 ac_val -= 16;
271 for(i=1;i<8;i++) {
272 block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
273 }
274 pred_dc = a;
275 }
276 } else {
277 /* top prediction */
278 if (c != 1024) {
279 ac_val -= 16 * wrap;
280 for(i=1;i<8;i++) {
281 block[s->dsp.idct_permutation[i ]] += ac_val[i + 8];
282 }
283 pred_dc = c;
284 }
285 }
286 } else {
287 /* just DC prediction */
288 if (a != 1024 && c != 1024)
289 pred_dc = (a + c) >> 1;
290 else if (a != 1024)
291 pred_dc = a;
292 else
293 pred_dc = c;
294 }
295
296 /* we assume pred is positive */
297 block[0]=block[0]*scale + pred_dc;
298
299 if (block[0] < 0)
300 block[0] = 0;
301 else
302 block[0] |= 1;
303
304 /* Update AC/DC tables */
305 dc_val[(x) + (y) * wrap] = block[0];
306
307 /* left copy */
308 for(i=1;i<8;i++)
309 ac_val1[i ] = block[s->dsp.idct_permutation[i<<3]];
310 /* top copy */
311 for(i=1;i<8;i++)
312 ac_val1[8 + i] = block[s->dsp.idct_permutation[i ]];
313 }
314
315 int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,
316 int *px, int *py)
317 {
318 int wrap;
319 int16_t *A, *B, *C, (*mot_val)[2];
320 static const int off[4]= {2, 1, 1, -1};
321
322 wrap = s->b8_stride;
323 mot_val = s->current_picture.motion_val[dir] + s->block_index[block];
324
325 A = mot_val[ - 1];
326 /* special case for first (slice) line */
327 if (s->first_slice_line && block<3) {
328 // we can't just change some MVs to simulate that as we need them for the B frames (and ME)
329 // and if we ever support non rectangular objects than we need to do a few ifs here anyway :(
330 if(block==0){ //most common case
331 if(s->mb_x == s->resync_mb_x){ //rare
332 *px= *py = 0;
333 }else if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare
334 C = mot_val[off[block] - wrap];
335 if(s->mb_x==0){
336 *px = C[0];
337 *py = C[1];
338 }else{
339 *px = mid_pred(A[0], 0, C[0]);
340 *py = mid_pred(A[1], 0, C[1]);
341 }
342 }else{
343 *px = A[0];
344 *py = A[1];
345 }
346 }else if(block==1){
347 if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare
348 C = mot_val[off[block] - wrap];
349 *px = mid_pred(A[0], 0, C[0]);
350 *py = mid_pred(A[1], 0, C[1]);
351 }else{
352 *px = A[0];
353 *py = A[1];
354 }
355 }else{ /* block==2*/
356 B = mot_val[ - wrap];
357 C = mot_val[off[block] - wrap];
358 if(s->mb_x == s->resync_mb_x) //rare
359 A[0]=A[1]=0;
360
361 *px = mid_pred(A[0], B[0], C[0]);
362 *py = mid_pred(A[1], B[1], C[1]);
363 }
364 } else {
365 B = mot_val[ - wrap];
366 C = mot_val[off[block] - wrap];
367 *px = mid_pred(A[0], B[0], C[0]);
368 *py = mid_pred(A[1], B[1], C[1]);
369 }
370 return *mot_val;
371 }
372
373
374 /**
375 * Get the GOB height based on picture height.
376 */
377 int ff_h263_get_gob_height(MpegEncContext *s){
378 if (s->height <= 400)
379 return 1;
380 else if (s->height <= 800)
381 return 2;
382 else
383 return 4;
384 }