Remove some useless parentheses.
[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 #include "xvmc.h"
33
34 //set s->block
35 void ff_xvmc_init_block(MpegEncContext *s)
36 {
37     struct xvmc_render_state * render;
38     render = (struct xvmc_render_state*)s->current_picture.data[2];
39     assert(render);
40     if (!render || render->magic != AV_XVMC_RENDER_MAGIC) {
41         assert(0);
42         return;//make sure that this is a render packet
43     }
44     s->block = (DCTELEM *)(render->data_blocks + render->next_free_data_block_num * 64);
45 }
46
47 void ff_xvmc_pack_pblocks(MpegEncContext *s, int cbp)
48 {
49     int i,j;
50     const int mb_block_count = 4 + (1 << s->chroma_format);
51
52     j = 0;
53     cbp <<= 12-mb_block_count;
54     for (i = 0; i < mb_block_count; i++) {
55         if (cbp & (1<<11)) {
56             s->pblocks[i] = (short *)(&s->block[j++]);
57         }else{
58             s->pblocks[i] = NULL;
59         }
60         cbp+=cbp;
61     }
62 }
63
64 //These functions should be called on every new field and/or frame.
65 //They should be safe if they are called a few times for the same field!
66 int ff_xvmc_field_start(MpegEncContext*s, AVCodecContext *avctx)
67 {
68     struct xvmc_render_state * render, * last, * next;
69
70     assert(avctx);
71
72     render = (struct xvmc_render_state*)s->current_picture.data[2];
73     assert(render);
74     if (!render || render->magic != AV_XVMC_RENDER_MAGIC)
75         return -1;//make sure that this is render packet
76
77     render->picture_structure = s->picture_structure;
78     render->flags             = s->first_field ? 0 : XVMC_SECOND_FIELD;
79
80 //make sure that all data is drawn by XVMC_end_frame
81     assert(render->filled_mv_blocks_num == 0);
82
83     render->p_future_surface = NULL;
84     render->p_past_surface   = NULL;
85
86     switch(s->pict_type){
87         case  FF_I_TYPE:
88             return 0;// no prediction from other frames
89         case  FF_B_TYPE:
90             next = (struct xvmc_render_state*)s->next_picture.data[2];
91             assert(next);
92             if (!next)
93                 return -1;
94             if (next->magic != AV_XVMC_RENDER_MAGIC)
95                 return -1;
96             render->p_future_surface = next->p_surface;
97             //no return here, going to set forward prediction
98         case  FF_P_TYPE:
99             last = (struct xvmc_render_state*)s->last_picture.data[2];
100             if (!last)// && !s->first_field)
101                 last = render;//predict second field from the first
102             if (last->magic != AV_XVMC_RENDER_MAGIC)
103                 return -1;
104             render->p_past_surface = last->p_surface;
105             return 0;
106     }
107
108 return -1;
109 }
110
111 void ff_xvmc_field_end(MpegEncContext *s)
112 {
113     struct xvmc_render_state * render;
114     render = (struct xvmc_render_state*)s->current_picture.data[2];
115     assert(render);
116
117     if (render->filled_mv_blocks_num > 0)
118         ff_draw_horiz_band(s,0,0);
119 }
120
121 void ff_xvmc_decode_mb(MpegEncContext *s)
122 {
123     XvMCMacroBlock * mv_block;
124     struct xvmc_render_state * render;
125     int i,cbp,blocks_per_mb;
126
127     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
128
129
130     if (s->encoding) {
131         av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
132         return;
133     }
134
135    //from MPV_decode_mb(),
136     /* update DC predictors for P macroblocks */
137     if (!s->mb_intra) {
138         s->last_dc[0] =
139         s->last_dc[1] =
140         s->last_dc[2] =  128 << s->intra_dc_precision;
141     }
142
143    //MC doesn't skip blocks
144     s->mb_skipped = 0;
145
146
147    // Do I need to export quant when I could not perform postprocessing?
148    // Anyway, it doesn't hurt.
149     s->current_picture.qscale_table[mb_xy] = s->qscale;
150
151 //START OF XVMC specific code
152     render = (struct xvmc_render_state*)s->current_picture.data[2];
153     assert(render);
154     assert(render->magic==AV_XVMC_RENDER_MAGIC);
155     assert(render->mv_blocks);
156
157     //take the next free macroblock
158     mv_block = &render->mv_blocks[render->start_mv_blocks_num +
159                                   render->filled_mv_blocks_num ];
160
161     mv_block->x        = s->mb_x;
162     mv_block->y        = s->mb_y;
163     mv_block->dct_type = s->interlaced_dct;//XVMC_DCT_TYPE_FRAME/FIELD;
164     if (s->mb_intra){
165         mv_block->macroblock_type = XVMC_MB_TYPE_INTRA;//no MC, all done
166     }else{
167         mv_block->macroblock_type = XVMC_MB_TYPE_PATTERN;
168
169         if (s->mv_dir & MV_DIR_FORWARD) {
170             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_FORWARD;
171             //pmv[n][dir][xy]=mv[dir][n][xy]
172             mv_block->PMV[0][0][0] = s->mv[0][0][0];
173             mv_block->PMV[0][0][1] = s->mv[0][0][1];
174             mv_block->PMV[1][0][0] = s->mv[0][1][0];
175             mv_block->PMV[1][0][1] = s->mv[0][1][1];
176         }
177         if (s->mv_dir & MV_DIR_BACKWARD) {
178             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_BACKWARD;
179             mv_block->PMV[0][1][0] = s->mv[1][0][0];
180             mv_block->PMV[0][1][1] = s->mv[1][0][1];
181             mv_block->PMV[1][1][0] = s->mv[1][1][0];
182             mv_block->PMV[1][1][1] = s->mv[1][1][1];
183         }
184
185         switch(s->mv_type){
186             case  MV_TYPE_16X16:
187                 mv_block->motion_type = XVMC_PREDICTION_FRAME;
188                 break;
189             case  MV_TYPE_16X8:
190                 mv_block->motion_type = XVMC_PREDICTION_16x8;
191                 break;
192             case  MV_TYPE_FIELD:
193                 mv_block->motion_type = XVMC_PREDICTION_FIELD;
194                 if (s->picture_structure == PICT_FRAME) {
195                     mv_block->PMV[0][0][1] <<= 1;
196                     mv_block->PMV[1][0][1] <<= 1;
197                     mv_block->PMV[0][1][1] <<= 1;
198                     mv_block->PMV[1][1][1] <<= 1;
199                 }
200                 break;
201             case  MV_TYPE_DMV:
202                 mv_block->motion_type = XVMC_PREDICTION_DUAL_PRIME;
203                 if (s->picture_structure == PICT_FRAME) {
204
205                     mv_block->PMV[0][0][0] = s->mv[0][0][0];//top from top
206                     mv_block->PMV[0][0][1] = s->mv[0][0][1]<<1;
207
208                     mv_block->PMV[0][1][0] = s->mv[0][0][0];//bottom from bottom
209                     mv_block->PMV[0][1][1] = s->mv[0][0][1]<<1;
210
211                     mv_block->PMV[1][0][0] = s->mv[0][2][0];//dmv00, top from bottom
212                     mv_block->PMV[1][0][1] = s->mv[0][2][1]<<1;//dmv01
213
214                     mv_block->PMV[1][1][0] = s->mv[0][3][0];//dmv10, bottom from top
215                     mv_block->PMV[1][1][1] = s->mv[0][3][1]<<1;//dmv11
216
217                 }else{
218                     mv_block->PMV[0][1][0] = s->mv[0][2][0];//dmv00
219                     mv_block->PMV[0][1][1] = s->mv[0][2][1];//dmv01
220                 }
221                 break;
222             default:
223                 assert(0);
224         }
225
226         mv_block->motion_vertical_field_select = 0;
227
228 //set correct field references
229         if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) {
230             if (s->field_select[0][0])
231                 mv_block->motion_vertical_field_select |= 1;
232             if (s->field_select[1][0])
233                 mv_block->motion_vertical_field_select |= 2;
234             if (s->field_select[0][1])
235                 mv_block->motion_vertical_field_select |= 4;
236             if (s->field_select[1][1])
237                 mv_block->motion_vertical_field_select |= 8;
238         }
239     }//!intra
240 //time to handle data blocks;
241     mv_block->index = render->next_free_data_block_num;
242
243     blocks_per_mb = 6;
244     if (s->chroma_format >= 2) {
245         blocks_per_mb = 4 + (1 << s->chroma_format);
246     }
247
248 //  calculate cbp
249     cbp = 0;
250     for (i = 0; i < blocks_per_mb; i++) {
251         cbp += cbp;
252         if (s->block_last_index[i] >= 0)
253             cbp++;
254     }
255
256     if (s->flags & CODEC_FLAG_GRAY) {
257         if (s->mb_intra){//intra frames are always full chroma block
258             for (i = 4; i < blocks_per_mb; i++) {
259                 memset(s->pblocks[i],0,sizeof(short)*8*8);//so we need to clear them
260                 if (!render->unsigned_intra)
261                     s->pblocks[i][0] = 1 << 10;
262             }
263         }else{
264             cbp &= 0xf << (blocks_per_mb - 4);
265             blocks_per_mb = 4;//luminance blocks only
266         }
267     }
268     mv_block->coded_block_pattern = cbp;
269     if (cbp == 0)
270         mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN;
271
272     for (i = 0; i < blocks_per_mb; i++) {
273         if (s->block_last_index[i] >= 0) {
274             // I do not have unsigned_intra MOCO to test, hope it is OK.
275             if ((s->mb_intra) && (render->idct || (!render->idct && !render->unsigned_intra)))
276                 s->pblocks[i][0] -= 1 << 10;
277             if (!render->idct) {
278                 s->dsp.idct(s->pblocks[i]);
279                 //!!TODO!clip!!!
280             }
281 //copy blocks only if the codec doesn't support pblocks reordering
282             if (s->avctx->xvmc_acceleration == 1) {
283                 memcpy(&render->data_blocks[render->next_free_data_block_num*64],
284                        s->pblocks[i],sizeof(short)*8*8);
285             }
286             render->next_free_data_block_num++;
287         }
288     }
289     render->filled_mv_blocks_num++;
290
291     assert(render->filled_mv_blocks_num     <= render->total_number_of_mv_blocks);
292     assert(render->next_free_data_block_num <= render->total_number_of_data_blocks);
293
294
295     if (render->filled_mv_blocks_num >= render->total_number_of_mv_blocks)
296         ff_draw_horiz_band(s,0,0);
297 }