ddb154784f7fec8d55643900d9fcb46e595d8fa2
[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 #include "xvmc_internal.h"
33
34 /**
35  * Initializes the block field of the MpegEncContext pointer passed as
36  * parameter after making sure that the data is not corrupted.
37  */
38 void ff_xvmc_init_block(MpegEncContext *s)
39 {
40     struct xvmc_pixfmt_render *render = (struct xvmc_pixfmt_render*)s->current_picture.data[2];
41     assert(render && render->magic_id == AV_XVMC_RENDER_MAGIC);
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 = 0;
49     const int mb_block_count = 4 + (1 << s->chroma_format);
50
51     cbp <<= 12-mb_block_count;
52     for (i = 0; i < mb_block_count; i++) {
53         if (cbp & (1 << 11))
54             s->pblocks[i] = (short *)(&s->block[j++]);
55         else
56             s->pblocks[i] = NULL;
57         cbp+=cbp;
58     }
59 }
60
61 /**
62  * This function should be called for every new field and/or frame.
63  * It should be safe to call the function a few times for the same field.
64  */
65 int ff_xvmc_field_start(MpegEncContext*s, AVCodecContext *avctx)
66 {
67     struct xvmc_pixfmt_render *last, *next, *render = (struct xvmc_pixfmt_render*)s->current_picture.data[2];
68     const int mb_block_count = 4 + (1 << s->chroma_format);
69
70     assert(avctx);
71     if (!render || render->magic_id != AV_XVMC_RENDER_MAGIC ||
72         !render->data_blocks || !render->mv_blocks) {
73         av_log(avctx, AV_LOG_ERROR,
74                "Render token doesn't look as expected.\n");
75         return -1; // make sure that this is a render packet
76     }
77
78     if (render->filled_mv_blocks_num) {
79         av_log(avctx, AV_LOG_ERROR,
80                "Rendering surface contains %i unprocessed blocks.\n",
81                render->filled_mv_blocks_num);
82         return -1;
83     }
84     if (render->total_number_of_mv_blocks   < 1 ||
85         render->total_number_of_data_blocks < mb_block_count) {
86         av_log(avctx, AV_LOG_ERROR,
87                "Rendering surface doesn't provide enough block structures to work with.\n");
88         return -1;
89     }
90
91     render->picture_structure = s->picture_structure;
92     render->flags             = s->first_field ? 0 : XVMC_SECOND_FIELD;
93     render->p_future_surface  = NULL;
94     render->p_past_surface    = NULL;
95
96     switch(s->pict_type) {
97         case  FF_I_TYPE:
98             return 0; // no prediction from other frames
99         case  FF_B_TYPE:
100             next = (struct xvmc_pixfmt_render*)s->next_picture.data[2];
101             if (!next)
102                 return -1;
103             if (next->magic_id != AV_XVMC_RENDER_MAGIC)
104                 return -1;
105             render->p_future_surface = next->p_surface;
106             // no return here, going to set forward prediction
107         case  FF_P_TYPE:
108             last = (struct xvmc_pixfmt_render*)s->last_picture.data[2];
109             if (!last)
110                 last = render; // predict second field from the first
111             if (last->magic_id != AV_XVMC_RENDER_MAGIC)
112                 return -1;
113             render->p_past_surface = last->p_surface;
114             return 0;
115     }
116
117 return -1;
118 }
119
120 /**
121  * This function should be called for every new field and/or frame.
122  * It should be safe to call the function a few times for the same field.
123  */
124 void ff_xvmc_field_end(MpegEncContext *s)
125 {
126     struct xvmc_pixfmt_render *render = (struct xvmc_pixfmt_render*)s->current_picture.data[2];
127     assert(render);
128
129     if (render->filled_mv_blocks_num > 0)
130         ff_draw_horiz_band(s, 0, 0);
131 }
132
133 void ff_xvmc_decode_mb(MpegEncContext *s)
134 {
135     XvMCMacroBlock *mv_block;
136     struct xvmc_pixfmt_render *render;
137     int i, cbp, blocks_per_mb;
138
139     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
140
141
142     if (s->encoding) {
143         av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
144         return;
145     }
146
147     // from MPV_decode_mb(), update DC predictors for P macroblocks
148     if (!s->mb_intra) {
149         s->last_dc[0] =
150         s->last_dc[1] =
151         s->last_dc[2] =  128 << s->intra_dc_precision;
152     }
153
154     // MC doesn't skip blocks
155     s->mb_skipped = 0;
156
157
158     // Do I need to export quant when I could not perform postprocessing?
159     // Anyway, it doesn't hurt.
160     s->current_picture.qscale_table[mb_xy] = s->qscale;
161
162     // start of XVMC-specific code
163     render = (struct xvmc_pixfmt_render*)s->current_picture.data[2];
164     assert(render);
165     assert(render->magic_id == AV_XVMC_RENDER_MAGIC);
166     assert(render->mv_blocks);
167
168     // take the next free macroblock
169     mv_block = &render->mv_blocks[render->start_mv_blocks_num +
170                                   render->filled_mv_blocks_num];
171
172     mv_block->x        = s->mb_x;
173     mv_block->y        = s->mb_y;
174     mv_block->dct_type = s->interlaced_dct; // XVMC_DCT_TYPE_FRAME/FIELD;
175     if (s->mb_intra) {
176         mv_block->macroblock_type = XVMC_MB_TYPE_INTRA; // no MC, all done
177     } else {
178         mv_block->macroblock_type = XVMC_MB_TYPE_PATTERN;
179
180         if (s->mv_dir & MV_DIR_FORWARD) {
181             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_FORWARD;
182             // PMV[n][dir][xy] = mv[dir][n][xy]
183             mv_block->PMV[0][0][0] = s->mv[0][0][0];
184             mv_block->PMV[0][0][1] = s->mv[0][0][1];
185             mv_block->PMV[1][0][0] = s->mv[0][1][0];
186             mv_block->PMV[1][0][1] = s->mv[0][1][1];
187         }
188         if (s->mv_dir & MV_DIR_BACKWARD) {
189             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_BACKWARD;
190             mv_block->PMV[0][1][0] = s->mv[1][0][0];
191             mv_block->PMV[0][1][1] = s->mv[1][0][1];
192             mv_block->PMV[1][1][0] = s->mv[1][1][0];
193             mv_block->PMV[1][1][1] = s->mv[1][1][1];
194         }
195
196         switch(s->mv_type) {
197             case  MV_TYPE_16X16:
198                 mv_block->motion_type = XVMC_PREDICTION_FRAME;
199                 break;
200             case  MV_TYPE_16X8:
201                 mv_block->motion_type = XVMC_PREDICTION_16x8;
202                 break;
203             case  MV_TYPE_FIELD:
204                 mv_block->motion_type = XVMC_PREDICTION_FIELD;
205                 if (s->picture_structure == PICT_FRAME) {
206                     mv_block->PMV[0][0][1] <<= 1;
207                     mv_block->PMV[1][0][1] <<= 1;
208                     mv_block->PMV[0][1][1] <<= 1;
209                     mv_block->PMV[1][1][1] <<= 1;
210                 }
211                 break;
212             case  MV_TYPE_DMV:
213                 mv_block->motion_type = XVMC_PREDICTION_DUAL_PRIME;
214                 if (s->picture_structure == PICT_FRAME) {
215
216                     mv_block->PMV[0][0][0] = s->mv[0][0][0];      // top from top
217                     mv_block->PMV[0][0][1] = s->mv[0][0][1] << 1;
218
219                     mv_block->PMV[0][1][0] = s->mv[0][0][0];      // bottom from bottom
220                     mv_block->PMV[0][1][1] = s->mv[0][0][1] << 1;
221
222                     mv_block->PMV[1][0][0] = s->mv[0][2][0];      // dmv00, top from bottom
223                     mv_block->PMV[1][0][1] = s->mv[0][2][1] << 1; // dmv01
224
225                     mv_block->PMV[1][1][0] = s->mv[0][3][0];      // dmv10, bottom from top
226                     mv_block->PMV[1][1][1] = s->mv[0][3][1] << 1; // dmv11
227
228                 } else {
229                     mv_block->PMV[0][1][0] = s->mv[0][2][0];      // dmv00
230                     mv_block->PMV[0][1][1] = s->mv[0][2][1];      // dmv01
231                 }
232                 break;
233             default:
234                 assert(0);
235         }
236
237         mv_block->motion_vertical_field_select = 0;
238
239         // set correct field references
240         if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) {
241             mv_block->motion_vertical_field_select |= s->field_select[0][0];
242             mv_block->motion_vertical_field_select |= s->field_select[1][0] << 1;
243             mv_block->motion_vertical_field_select |= s->field_select[0][1] << 2;
244             mv_block->motion_vertical_field_select |= s->field_select[1][1] << 3;
245         }
246     } // !intra
247     // time to handle data blocks
248     mv_block->index = render->next_free_data_block_num;
249
250     blocks_per_mb = 6;
251     if (s->chroma_format >= 2) {
252         blocks_per_mb = 4 + (1 << s->chroma_format);
253     }
254
255     // calculate cbp
256     cbp = 0;
257     for (i = 0; i < blocks_per_mb; i++) {
258         cbp += cbp;
259         if (s->block_last_index[i] >= 0)
260             cbp++;
261     }
262
263     if (s->flags & CODEC_FLAG_GRAY) {
264         if (s->mb_intra) {                                   // intra frames are always full chroma blocks
265             for (i = 4; i < blocks_per_mb; i++) {
266                 memset(s->pblocks[i], 0, sizeof(short)*64);  // so we need to clear them
267                 if (!render->unsigned_intra)
268                     s->pblocks[i][0] = 1 << 10;
269             }
270         } else {
271             cbp &= 0xf << (blocks_per_mb - 4);
272             blocks_per_mb = 4;                               // luminance blocks only
273         }
274     }
275     mv_block->coded_block_pattern = cbp;
276     if (cbp == 0)
277         mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN;
278
279     for (i = 0; i < blocks_per_mb; i++) {
280         if (s->block_last_index[i] >= 0) {
281             // I do not have unsigned_intra MOCO to test, hope it is OK.
282             if (s->mb_intra && (render->idct || (!render->idct && !render->unsigned_intra)))
283                 s->pblocks[i][0] -= 1 << 10;
284             if (!render->idct) {
285                 s->dsp.idct(s->pblocks[i]);
286                 /* It is unclear if MC hardware requires pixel diff values to be
287                  * in the range [-255;255]. TODO: Clipping if such hardware is
288                  * ever found. As of now it would only be an unnecessary
289                  * slowdown. */
290             }
291             // copy blocks only if the codec doesn't support pblocks reordering
292             if (s->avctx->xvmc_acceleration == 1) {
293                 memcpy(&render->data_blocks[render->next_free_data_block_num*64],
294                        s->pblocks[i], sizeof(short)*64);
295             }
296             render->next_free_data_block_num++;
297         }
298     }
299     render->filled_mv_blocks_num++;
300
301     assert(render->filled_mv_blocks_num     <= render->total_number_of_mv_blocks);
302     assert(render->next_free_data_block_num <= render->total_number_of_data_blocks);
303     /* The above conditions should not be able to fail as long as this function
304      * is used and the following 'if ()' automatically calls a callback to free
305      * blocks. */
306
307
308     if (render->filled_mv_blocks_num == render->total_number_of_mv_blocks)
309         ff_draw_horiz_band(s, 0, 0);
310 }