whitespace cosmetics: consistent (more or less) K&R style
[ffmpeg.git] / libavcodec / mpegvideo_xvmc.c
1 /*
2  * XVideo Motion Compensation
3  * Copyright (c) 2003 Ivan Kalvachev
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21
22 #include <limits.h>
23
24 //avcodec include
25 #include "avcodec.h"
26 #include "dsputil.h"
27 #include "mpegvideo.h"
28
29 #undef NDEBUG
30 #include <assert.h>
31
32 //X11 includes are in libavcodec/xvmc.h
33 //by replacing it with non-X one
34 //XvMC emulation could be performed
35
36 #include "xvmc.h"
37
38 //set s->block
39 void XVMC_init_block(MpegEncContext *s)
40 {
41     struct xvmc_render_state * render;
42     render = (struct xvmc_render_state*)s->current_picture.data[2];
43     assert(render != NULL);
44     if ((render == NULL) || (render->magic != MP_XVMC_RENDER_MAGIC)) {
45         assert(0);
46         return;//make sure that this is a render packet
47     }
48     s->block =(DCTELEM *)(render->data_blocks+(render->next_free_data_block_num)*64);
49 }
50
51 void XVMC_pack_pblocks(MpegEncContext *s, int cbp)
52 {
53     int i,j;
54     const int mb_block_count = 4 + (1 << s->chroma_format);
55
56     j = 0;
57     cbp <<= 12-mb_block_count;
58     for (i = 0; i < mb_block_count; i++) {
59         if (cbp & (1<<11)) {
60             s->pblocks[i] = (short *)(&s->block[(j++)]);
61         }else{
62             s->pblocks[i] = NULL;
63         }
64         cbp+=cbp;
65     }
66 }
67
68 //These functions should be called on every new field and/or frame.
69 //They should be safe if they are called a few times for the same field!
70 int XVMC_field_start(MpegEncContext*s, AVCodecContext *avctx)
71 {
72     struct xvmc_render_state * render, * last, * next;
73
74     assert(avctx != NULL);
75
76     render = (struct xvmc_render_state*)s->current_picture.data[2];
77     assert(render != NULL);
78     if ((render == NULL) || (render->magic != MP_XVMC_RENDER_MAGIC))
79         return -1;//make sure that this is render packet
80
81     render->picture_structure = s->picture_structure;
82     render->flags = (s->first_field)? 0: XVMC_SECOND_FIELD;
83
84 //make sure that all data is drawn by XVMC_end_frame
85     assert(render->filled_mv_blocks_num==0);
86
87     render->p_future_surface = NULL;
88     render->p_past_surface = NULL;
89
90     switch(s->pict_type){
91         case  FF_I_TYPE:
92             return 0;// no prediction from other frames
93         case  FF_B_TYPE:
94             next = (struct xvmc_render_state*)s->next_picture.data[2];
95             assert(next!=NULL);
96             assert(next->state & MP_XVMC_STATE_PREDICTION);
97             if (next == NULL)
98                 return -1;
99             if (next->magic != MP_XVMC_RENDER_MAGIC)
100                 return -1;
101             render->p_future_surface = next->p_surface;
102             //no return here, going to set forward prediction
103         case  FF_P_TYPE:
104             last = (struct xvmc_render_state*)s->last_picture.data[2];
105             if (last == NULL)// && !s->first_field)
106                 last = render;//predict second field from the first
107             if (last->magic != MP_XVMC_RENDER_MAGIC)
108                 return -1;
109             assert(last->state & MP_XVMC_STATE_PREDICTION);
110             render->p_past_surface = last->p_surface;
111             return 0;
112     }
113
114 return -1;
115 }
116
117 void XVMC_field_end(MpegEncContext *s)
118 {
119     struct xvmc_render_state * render;
120     render = (struct xvmc_render_state*)s->current_picture.data[2];
121     assert(render != NULL);
122
123     if (render->filled_mv_blocks_num > 0)
124         ff_draw_horiz_band(s,0,0);
125 }
126
127 void XVMC_decode_mb(MpegEncContext *s)
128 {
129     XvMCMacroBlock * mv_block;
130     struct xvmc_render_state * render;
131     int i,cbp,blocks_per_mb;
132
133     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
134
135
136     if (s->encoding) {
137         av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
138         return;
139     }
140
141    //from MPV_decode_mb(),
142     /* update DC predictors for P macroblocks */
143     if (!s->mb_intra) {
144         s->last_dc[0] =
145         s->last_dc[1] =
146         s->last_dc[2] =  128 << s->intra_dc_precision;
147     }
148
149    //MC doesn't skip blocks
150     s->mb_skipped = 0;
151
152
153    // Do I need to export quant when I could not perform postprocessing?
154    // Anyway, it doesn't hurt.
155     s->current_picture.qscale_table[mb_xy] = s->qscale;
156
157 //START OF XVMC specific code
158     render = (struct xvmc_render_state*)s->current_picture.data[2];
159     assert(render!=NULL);
160     assert(render->magic==MP_XVMC_RENDER_MAGIC);
161     assert(render->mv_blocks);
162
163     //take the next free macroblock
164     mv_block = &render->mv_blocks[render->start_mv_blocks_num +
165                                   render->filled_mv_blocks_num ];
166
167     mv_block->x = s->mb_x;
168     mv_block->y = s->mb_y;
169     mv_block->dct_type = s->interlaced_dct;//XVMC_DCT_TYPE_FRAME/FIELD;
170     if (s->mb_intra){
171         mv_block->macroblock_type = XVMC_MB_TYPE_INTRA;//no MC, all done
172     }else{
173         mv_block->macroblock_type = XVMC_MB_TYPE_PATTERN;
174
175         if (s->mv_dir & MV_DIR_FORWARD) {
176             mv_block->macroblock_type|= XVMC_MB_TYPE_MOTION_FORWARD;
177             //pmv[n][dir][xy]=mv[dir][n][xy]
178             mv_block->PMV[0][0][0] = s->mv[0][0][0];
179             mv_block->PMV[0][0][1] = s->mv[0][0][1];
180             mv_block->PMV[1][0][0] = s->mv[0][1][0];
181             mv_block->PMV[1][0][1] = s->mv[0][1][1];
182         }
183         if (s->mv_dir & MV_DIR_BACKWARD) {
184             mv_block->macroblock_type|=XVMC_MB_TYPE_MOTION_BACKWARD;
185             mv_block->PMV[0][1][0] = s->mv[1][0][0];
186             mv_block->PMV[0][1][1] = s->mv[1][0][1];
187             mv_block->PMV[1][1][0] = s->mv[1][1][0];
188             mv_block->PMV[1][1][1] = s->mv[1][1][1];
189         }
190
191         switch(s->mv_type){
192             case  MV_TYPE_16X16:
193                 mv_block->motion_type = XVMC_PREDICTION_FRAME;
194                 break;
195             case  MV_TYPE_16X8:
196                 mv_block->motion_type = XVMC_PREDICTION_16x8;
197                 break;
198             case  MV_TYPE_FIELD:
199                 mv_block->motion_type = XVMC_PREDICTION_FIELD;
200                 if (s->picture_structure == PICT_FRAME) {
201                     mv_block->PMV[0][0][1] <<= 1;
202                     mv_block->PMV[1][0][1] <<= 1;
203                     mv_block->PMV[0][1][1] <<= 1;
204                     mv_block->PMV[1][1][1] <<= 1;
205                 }
206                 break;
207             case  MV_TYPE_DMV:
208                 mv_block->motion_type = XVMC_PREDICTION_DUAL_PRIME;
209                 if (s->picture_structure == PICT_FRAME) {
210
211                     mv_block->PMV[0][0][0] = s->mv[0][0][0];//top from top
212                     mv_block->PMV[0][0][1] = s->mv[0][0][1]<<1;
213
214                     mv_block->PMV[0][1][0] = s->mv[0][0][0];//bottom from bottom
215                     mv_block->PMV[0][1][1] = s->mv[0][0][1]<<1;
216
217                     mv_block->PMV[1][0][0] = s->mv[0][2][0];//dmv00, top from bottom
218                     mv_block->PMV[1][0][1] = s->mv[0][2][1]<<1;//dmv01
219
220                     mv_block->PMV[1][1][0] = s->mv[0][3][0];//dmv10, bottom from top
221                     mv_block->PMV[1][1][1] = s->mv[0][3][1]<<1;//dmv11
222
223                 }else{
224                     mv_block->PMV[0][1][0] = s->mv[0][2][0];//dmv00
225                     mv_block->PMV[0][1][1] = s->mv[0][2][1];//dmv01
226                 }
227                 break;
228             default:
229                 assert(0);
230         }
231
232         mv_block->motion_vertical_field_select = 0;
233
234 //set correct field references
235         if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) {
236             if (s->field_select[0][0])
237                 mv_block->motion_vertical_field_select |= 1;
238             if (s->field_select[1][0])
239                 mv_block->motion_vertical_field_select |= 2;
240             if (s->field_select[0][1])
241                 mv_block->motion_vertical_field_select |= 4;
242             if (s->field_select[1][1])
243                 mv_block->motion_vertical_field_select |= 8;
244         }
245     }//!intra
246 //time to handle data blocks;
247     mv_block->index = render->next_free_data_block_num;
248
249     blocks_per_mb = 6;
250     if (s->chroma_format >= 2) {
251         blocks_per_mb = 4 + (1 << (s->chroma_format));
252     }
253
254 //  calculate cbp
255     cbp = 0;
256     for (i = 0; i < blocks_per_mb; i++) {
257         cbp+= cbp;
258         if (s->block_last_index[i] >= 0)
259             cbp++;
260     }
261
262     if (s->flags & CODEC_FLAG_GRAY) {
263         if (s->mb_intra){//intra frames are always full chroma block
264             for (i = 4; i < blocks_per_mb; i++) {
265                 memset(s->pblocks[i],0,sizeof(short)*8*8);//so we need to clear them
266                 if (!render->unsigned_intra)
267                     s->pblocks[i][0] = 1 << 10;
268             }
269         }else{
270             cbp &= 0xf << (blocks_per_mb - 4);
271             blocks_per_mb = 4;//luminance blocks only
272         }
273     }
274     mv_block->coded_block_pattern = cbp;
275     if (cbp == 0)
276         mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN;
277
278     for (i = 0; i < blocks_per_mb; i++) {
279         if (s->block_last_index[i] >= 0) {
280             // I do not have unsigned_intra MOCO to test, hope it is OK.
281             if ((s->mb_intra) && (render->idct || (!render->idct && !render->unsigned_intra)))
282                 s->pblocks[i][0] -= 1 << 10;
283             if (!render->idct) {
284                 s->dsp.idct(s->pblocks[i]);
285                 //!!TODO!clip!!!
286             }
287 //copy blocks only if the codec doesn't support pblocks reordering
288             if (s->avctx->xvmc_acceleration == 1) {
289                 memcpy(&render->data_blocks[(render->next_free_data_block_num)*64],
290                        s->pblocks[i],sizeof(short)*8*8);
291             }
292             render->next_free_data_block_num++;
293         }
294     }
295     render->filled_mv_blocks_num++;
296
297     assert(render->filled_mv_blocks_num <= render->total_number_of_mv_blocks);
298     assert(render->next_free_data_block_num <= render->total_number_of_data_blocks);
299
300
301     if (render->filled_mv_blocks_num >= render->total_number_of_mv_blocks)
302         ff_draw_horiz_band(s,0,0);
303 }