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