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