whitespace cosmetics: Correctly indent all comments.
[libav.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(),
135 /* update DC predictors for P macroblocks */
136 if (!s->mb_intra) {
137 s->last_dc[0] =
138 s->last_dc[1] =
139 s->last_dc[2] = 128 << s->intra_dc_precision;
140 }
141
142 //MC doesn't skip blocks
143 s->mb_skipped = 0;
144
145
146 // Do I need to export quant when I could not perform postprocessing?
147 // Anyway, it doesn't hurt.
148 s->current_picture.qscale_table[mb_xy] = s->qscale;
149
150 //START OF XVMC specific code
151 render = (struct xvmc_render_state*)s->current_picture.data[2];
152 assert(render);
153 assert(render->magic==AV_XVMC_RENDER_MAGIC);
154 assert(render->mv_blocks);
155
156 //take the next free macroblock
157 mv_block = &render->mv_blocks[render->start_mv_blocks_num +
158 render->filled_mv_blocks_num ];
159
160 mv_block->x = s->mb_x;
161 mv_block->y = s->mb_y;
162 mv_block->dct_type = s->interlaced_dct;//XVMC_DCT_TYPE_FRAME/FIELD;
163 if (s->mb_intra) {
164 mv_block->macroblock_type = XVMC_MB_TYPE_INTRA;//no MC, all done
165 } else {
166 mv_block->macroblock_type = XVMC_MB_TYPE_PATTERN;
167
168 if (s->mv_dir & MV_DIR_FORWARD) {
169 mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_FORWARD;
170 //pmv[n][dir][xy]=mv[dir][n][xy]
171 mv_block->PMV[0][0][0] = s->mv[0][0][0];
172 mv_block->PMV[0][0][1] = s->mv[0][0][1];
173 mv_block->PMV[1][0][0] = s->mv[0][1][0];
174 mv_block->PMV[1][0][1] = s->mv[0][1][1];
175 }
176 if (s->mv_dir & MV_DIR_BACKWARD) {
177 mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_BACKWARD;
178 mv_block->PMV[0][1][0] = s->mv[1][0][0];
179 mv_block->PMV[0][1][1] = s->mv[1][0][1];
180 mv_block->PMV[1][1][0] = s->mv[1][1][0];
181 mv_block->PMV[1][1][1] = s->mv[1][1][1];
182 }
183
184 switch(s->mv_type){
185 case MV_TYPE_16X16:
186 mv_block->motion_type = XVMC_PREDICTION_FRAME;
187 break;
188 case MV_TYPE_16X8:
189 mv_block->motion_type = XVMC_PREDICTION_16x8;
190 break;
191 case MV_TYPE_FIELD:
192 mv_block->motion_type = XVMC_PREDICTION_FIELD;
193 if (s->picture_structure == PICT_FRAME) {
194 mv_block->PMV[0][0][1] <<= 1;
195 mv_block->PMV[1][0][1] <<= 1;
196 mv_block->PMV[0][1][1] <<= 1;
197 mv_block->PMV[1][1][1] <<= 1;
198 }
199 break;
200 case MV_TYPE_DMV:
201 mv_block->motion_type = XVMC_PREDICTION_DUAL_PRIME;
202 if (s->picture_structure == PICT_FRAME) {
203
204 mv_block->PMV[0][0][0] = s->mv[0][0][0];//top from top
205 mv_block->PMV[0][0][1] = s->mv[0][0][1]<<1;
206
207 mv_block->PMV[0][1][0] = s->mv[0][0][0];//bottom from bottom
208 mv_block->PMV[0][1][1] = s->mv[0][0][1]<<1;
209
210 mv_block->PMV[1][0][0] = s->mv[0][2][0];//dmv00, top from bottom
211 mv_block->PMV[1][0][1] = s->mv[0][2][1]<<1;//dmv01
212
213 mv_block->PMV[1][1][0] = s->mv[0][3][0];//dmv10, bottom from top
214 mv_block->PMV[1][1][1] = s->mv[0][3][1]<<1;//dmv11
215
216 } else {
217 mv_block->PMV[0][1][0] = s->mv[0][2][0];//dmv00
218 mv_block->PMV[0][1][1] = s->mv[0][2][1];//dmv01
219 }
220 break;
221 default:
222 assert(0);
223 }
224
225 mv_block->motion_vertical_field_select = 0;
226
227 //set correct field references
228 if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) {
229 mv_block->motion_vertical_field_select |= s->field_select[0][0];
230 mv_block->motion_vertical_field_select |= s->field_select[1][0]<<1;
231 mv_block->motion_vertical_field_select |= s->field_select[0][1]<<2;
232 mv_block->motion_vertical_field_select |= s->field_select[1][1]<<3;
233 }
234 }//!intra
235 //time to handle data blocks;
236 mv_block->index = render->next_free_data_block_num;
237
238 blocks_per_mb = 6;
239 if (s->chroma_format >= 2) {
240 blocks_per_mb = 4 + (1 << s->chroma_format);
241 }
242
243 // calculate cbp
244 cbp = 0;
245 for (i = 0; i < blocks_per_mb; i++) {
246 cbp += cbp;
247 if (s->block_last_index[i] >= 0)
248 cbp++;
249 }
250
251 if (s->flags & CODEC_FLAG_GRAY) {
252 if (s->mb_intra) {//intra frames are always full chroma block
253 for (i = 4; i < blocks_per_mb; i++) {
254 memset(s->pblocks[i],0,sizeof(short)*8*8);//so we need to clear them
255 if (!render->unsigned_intra)
256 s->pblocks[i][0] = 1 << 10;
257 }
258 } else {
259 cbp &= 0xf << (blocks_per_mb - 4);
260 blocks_per_mb = 4;//luminance blocks only
261 }
262 }
263 mv_block->coded_block_pattern = cbp;
264 if (cbp == 0)
265 mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN;
266
267 for (i = 0; i < blocks_per_mb; i++) {
268 if (s->block_last_index[i] >= 0) {
269 // I do not have unsigned_intra MOCO to test, hope it is OK.
270 if (s->mb_intra && (render->idct || !render->idct && !render->unsigned_intra))
271 s->pblocks[i][0] -= 1 << 10;
272 if (!render->idct) {
273 s->dsp.idct(s->pblocks[i]);
274 /*It is unclear if MC hardware requires pixel diff values to be in
275 range [-255;255]. TODO cliping if such hardware is ever found.
276 As of now it would only be unnecessery slowdown. */
277 }
278 //copy blocks only if the codec doesn't support pblocks reordering
279 if (s->avctx->xvmc_acceleration == 1) {
280 memcpy(&render->data_blocks[render->next_free_data_block_num*64],
281 s->pblocks[i],sizeof(short)*8*8);
282 }
283 render->next_free_data_block_num++;
284 }
285 }
286 render->filled_mv_blocks_num++;
287
288 assert(render->filled_mv_blocks_num <= render->total_number_of_mv_blocks);
289 assert(render->next_free_data_block_num <= render->total_number_of_data_blocks);
290
291
292 if (render->filled_mv_blocks_num >= render->total_number_of_mv_blocks)
293 ff_draw_horiz_band(s,0,0);
294 }