another (last?) round of K&R whitespace cosmetics
[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 #include "avcodec.h"
25 #include "dsputil.h"
26 #include "mpegvideo.h"
27
28 #undef NDEBUG
29 #include <assert.h>
30
31 #include "xvmc.h"
32
33 //set s->block
34 void ff_xvmc_init_block(MpegEncContext *s)
35 {
36     struct xvmc_render_state *render;
37     render = (struct xvmc_render_state*)s->current_picture.data[2];
38     assert(render);
39     if (!render || render->magic != AV_XVMC_RENDER_MAGIC) {
40         assert(0);
41         return; // make sure that this is a render packet
42     }
43     s->block = (DCTELEM *)(render->data_blocks + render->next_free_data_block_num * 64);
44 }
45
46 void ff_xvmc_pack_pblocks(MpegEncContext *s, int cbp)
47 {
48     int i, j;
49     const int mb_block_count = 4 + (1 << s->chroma_format);
50
51     j = 0;
52     cbp <<= 12-mb_block_count;
53     for (i = 0; i < mb_block_count; i++) {
54         if (cbp & (1 << 11))
55             s->pblocks[i] = (short *)(&s->block[j++]);
56         else
57             s->pblocks[i] = NULL;
58         cbp+=cbp;
59     }
60 }
61
62 // These functions should be called on every new field and/or frame.
63 // They should be safe if they are called a few times for the same field!
64 int ff_xvmc_field_start(MpegEncContext*s, AVCodecContext *avctx)
65 {
66     struct xvmc_render_state *render, *last, *next;
67
68     assert(avctx);
69
70     render = (struct xvmc_render_state*)s->current_picture.data[2];
71     assert(render);
72     if (!render || render->magic != AV_XVMC_RENDER_MAGIC)
73         return -1; // make sure that this is a render packet
74
75     render->picture_structure = s->picture_structure;
76     render->flags             = s->first_field ? 0 : XVMC_SECOND_FIELD;
77
78     assert(render->filled_mv_blocks_num == 0);
79
80     render->p_future_surface = NULL;
81     render->p_past_surface   = NULL;
82
83     switch(s->pict_type) {
84         case  FF_I_TYPE:
85             return 0; // no prediction from other frames
86         case  FF_B_TYPE:
87             next = (struct xvmc_render_state*)s->next_picture.data[2];
88             assert(next);
89             if (!next)
90                 return -1;
91             if (next->magic != AV_XVMC_RENDER_MAGIC)
92                 return -1;
93             render->p_future_surface = next->p_surface;
94             // no return here, going to set forward prediction
95         case  FF_P_TYPE:
96             last = (struct xvmc_render_state*)s->last_picture.data[2];
97             if (!last)
98                 last = render; // predict second field from the first
99             if (last->magic != AV_XVMC_RENDER_MAGIC)
100                 return -1;
101             render->p_past_surface = last->p_surface;
102             return 0;
103     }
104
105 return -1;
106 }
107
108 void ff_xvmc_field_end(MpegEncContext *s)
109 {
110     struct xvmc_render_state *render;
111     render = (struct xvmc_render_state*)s->current_picture.data[2];
112     assert(render);
113
114     if (render->filled_mv_blocks_num > 0)
115         ff_draw_horiz_band(s, 0, 0);
116 }
117
118 void ff_xvmc_decode_mb(MpegEncContext *s)
119 {
120     XvMCMacroBlock *mv_block;
121     struct xvmc_render_state *render;
122     int i, cbp, blocks_per_mb;
123
124     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
125
126
127     if (s->encoding) {
128         av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
129         return;
130     }
131
132     // from MPV_decode_mb(), update DC predictors for P macroblocks
133     if (!s->mb_intra) {
134         s->last_dc[0] =
135         s->last_dc[1] =
136         s->last_dc[2] =  128 << s->intra_dc_precision;
137     }
138
139     // MC doesn't skip blocks
140     s->mb_skipped = 0;
141
142
143     // Do I need to export quant when I could not perform postprocessing?
144     // Anyway, it doesn't hurt.
145     s->current_picture.qscale_table[mb_xy] = s->qscale;
146
147     // start of XVMC-specific code
148     render = (struct xvmc_render_state*)s->current_picture.data[2];
149     assert(render);
150     assert(render->magic == AV_XVMC_RENDER_MAGIC);
151     assert(render->mv_blocks);
152
153     // take the next free macroblock
154     mv_block = &render->mv_blocks[render->start_mv_blocks_num +
155                                   render->filled_mv_blocks_num ];
156
157     mv_block->x        = s->mb_x;
158     mv_block->y        = s->mb_y;
159     mv_block->dct_type = s->interlaced_dct; // XVMC_DCT_TYPE_FRAME/FIELD;
160     if (s->mb_intra) {
161         mv_block->macroblock_type = XVMC_MB_TYPE_INTRA; // no MC, all done
162     } else {
163         mv_block->macroblock_type = XVMC_MB_TYPE_PATTERN;
164
165         if (s->mv_dir & MV_DIR_FORWARD) {
166             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_FORWARD;
167             // PMV[n][dir][xy] = mv[dir][n][xy]
168             mv_block->PMV[0][0][0] = s->mv[0][0][0];
169             mv_block->PMV[0][0][1] = s->mv[0][0][1];
170             mv_block->PMV[1][0][0] = s->mv[0][1][0];
171             mv_block->PMV[1][0][1] = s->mv[0][1][1];
172         }
173         if (s->mv_dir & MV_DIR_BACKWARD) {
174             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_BACKWARD;
175             mv_block->PMV[0][1][0] = s->mv[1][0][0];
176             mv_block->PMV[0][1][1] = s->mv[1][0][1];
177             mv_block->PMV[1][1][0] = s->mv[1][1][0];
178             mv_block->PMV[1][1][1] = s->mv[1][1][1];
179         }
180
181         switch(s->mv_type) {
182             case  MV_TYPE_16X16:
183                 mv_block->motion_type = XVMC_PREDICTION_FRAME;
184                 break;
185             case  MV_TYPE_16X8:
186                 mv_block->motion_type = XVMC_PREDICTION_16x8;
187                 break;
188             case  MV_TYPE_FIELD:
189                 mv_block->motion_type = XVMC_PREDICTION_FIELD;
190                 if (s->picture_structure == PICT_FRAME) {
191                     mv_block->PMV[0][0][1] <<= 1;
192                     mv_block->PMV[1][0][1] <<= 1;
193                     mv_block->PMV[0][1][1] <<= 1;
194                     mv_block->PMV[1][1][1] <<= 1;
195                 }
196                 break;
197             case  MV_TYPE_DMV:
198                 mv_block->motion_type = XVMC_PREDICTION_DUAL_PRIME;
199                 if (s->picture_structure == PICT_FRAME) {
200
201                     mv_block->PMV[0][0][0] = s->mv[0][0][0];      // top from top
202                     mv_block->PMV[0][0][1] = s->mv[0][0][1] << 1;
203
204                     mv_block->PMV[0][1][0] = s->mv[0][0][0];      // bottom from bottom
205                     mv_block->PMV[0][1][1] = s->mv[0][0][1] << 1;
206
207                     mv_block->PMV[1][0][0] = s->mv[0][2][0];      // dmv00, top from bottom
208                     mv_block->PMV[1][0][1] = s->mv[0][2][1] << 1; // dmv01
209
210                     mv_block->PMV[1][1][0] = s->mv[0][3][0];      // dmv10, bottom from top
211                     mv_block->PMV[1][1][1] = s->mv[0][3][1] << 1; // dmv11
212
213                 } else {
214                     mv_block->PMV[0][1][0] = s->mv[0][2][0];      // dmv00
215                     mv_block->PMV[0][1][1] = s->mv[0][2][1];      // dmv01
216                 }
217                 break;
218             default:
219                 assert(0);
220         }
221
222         mv_block->motion_vertical_field_select = 0;
223
224         // set correct field references
225         if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) {
226             mv_block->motion_vertical_field_select |= s->field_select[0][0];
227             mv_block->motion_vertical_field_select |= s->field_select[1][0] << 1;
228             mv_block->motion_vertical_field_select |= s->field_select[0][1] << 2;
229             mv_block->motion_vertical_field_select |= s->field_select[1][1] << 3;
230         }
231     } // !intra
232     // time to handle data blocks
233     mv_block->index = render->next_free_data_block_num;
234
235     blocks_per_mb = 6;
236     if (s->chroma_format >= 2) {
237         blocks_per_mb = 4 + (1 << s->chroma_format);
238     }
239
240     // calculate cbp
241     cbp = 0;
242     for (i = 0; i < blocks_per_mb; i++) {
243         cbp += cbp;
244         if (s->block_last_index[i] >= 0)
245             cbp++;
246     }
247
248     if (s->flags & CODEC_FLAG_GRAY) {
249         if (s->mb_intra) {                                   // intra frames are always full chroma blocks
250             for (i = 4; i < blocks_per_mb; i++) {
251                 memset(s->pblocks[i], 0, sizeof(short)*8*8); // so we need to clear them
252                 if (!render->unsigned_intra)
253                     s->pblocks[i][0] = 1 << 10;
254             }
255         } else {
256             cbp &= 0xf << (blocks_per_mb - 4);
257             blocks_per_mb = 4;                               // luminance blocks only
258         }
259     }
260     mv_block->coded_block_pattern = cbp;
261     if (cbp == 0)
262         mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN;
263
264     for (i = 0; i < blocks_per_mb; i++) {
265         if (s->block_last_index[i] >= 0) {
266             // I do not have unsigned_intra MOCO to test, hope it is OK.
267             if (s->mb_intra && (render->idct || (!render->idct && !render->unsigned_intra)))
268                 s->pblocks[i][0] -= 1 << 10;
269             if (!render->idct) {
270                 s->dsp.idct(s->pblocks[i]);
271                 /* It is unclear if MC hardware requires pixel diff values to be
272                  * in the range [-255;255]. TODO: Clipping if such hardware is
273                  * ever found. As of now it would only be an unnecessary
274                  * slowdown. */
275             }
276             // copy blocks only if the codec doesn't support pblocks reordering
277             if (s->avctx->xvmc_acceleration == 1) {
278                 memcpy(&render->data_blocks[render->next_free_data_block_num*64],
279                        s->pblocks[i], sizeof(short)*8*8);
280             }
281             render->next_free_data_block_num++;
282         }
283     }
284     render->filled_mv_blocks_num++;
285
286     assert(render->filled_mv_blocks_num     <= render->total_number_of_mv_blocks);
287     assert(render->next_free_data_block_num <= render->total_number_of_data_blocks);
288
289
290     if (render->filled_mv_blocks_num >= render->total_number_of_mv_blocks)
291         ff_draw_horiz_band(s, 0, 0);
292 }