lavc: fix support of unofficial pix_fmt extensions of jpeg
[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 #include <X11/extensions/XvMC.h>
24
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 #include "xvmc_internal.h"
34
35 /**
36  * Initialize the block field of the MpegEncContext pointer passed as
37  * parameter after making sure that the data is not corrupted.
38  * In order to implement something like direct rendering instead of decoding
39  * coefficients in s->blocks and then copying them, copy them directly
40  * into the data_blocks array provided by xvmc.
41  */
42 void ff_xvmc_init_block(MpegEncContext *s)
43 {
44     struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.f.data[2];
45     assert(render && render->xvmc_id == AV_XVMC_ID);
46
47     s->block = (DCTELEM (*)[64])(render->data_blocks + render->next_free_data_block_num * 64);
48 }
49
50 /**
51  * Fill individual block pointers, so there are no gaps in the data_block array
52  * in case not all blocks in the macroblock are coded.
53  */
54 void ff_xvmc_pack_pblocks(MpegEncContext *s, int cbp)
55 {
56     int i, j = 0;
57     const int mb_block_count = 4 + (1 << s->chroma_format);
58
59     cbp <<= 12-mb_block_count;
60     for (i = 0; i < mb_block_count; i++) {
61         if (cbp & (1 << 11))
62             s->pblocks[i] = &s->block[j++];
63         else
64             s->pblocks[i] = NULL;
65         cbp += cbp;
66     }
67 }
68
69 /**
70  * Find and store the surfaces that are used as reference frames.
71  * This function should be called for every new field and/or frame.
72  * It should be safe to call the function a few times for the same field.
73  */
74 int ff_xvmc_field_start(MpegEncContext *s, AVCodecContext *avctx)
75 {
76     struct xvmc_pix_fmt *last, *next, *render = (struct xvmc_pix_fmt*)s->current_picture.f.data[2];
77     const int mb_block_count = 4 + (1 << s->chroma_format);
78
79     assert(avctx);
80     if (!render || render->xvmc_id != AV_XVMC_ID ||
81         !render->data_blocks || !render->mv_blocks ||
82         (unsigned int)render->allocated_mv_blocks   > INT_MAX/(64*6) ||
83         (unsigned int)render->allocated_data_blocks > INT_MAX/64     ||
84         !render->p_surface) {
85         av_log(avctx, AV_LOG_ERROR,
86                "Render token doesn't look as expected.\n");
87         return -1; // make sure that this is a render packet
88     }
89
90     if (render->filled_mv_blocks_num) {
91         av_log(avctx, AV_LOG_ERROR,
92                "Rendering surface contains %i unprocessed blocks.\n",
93                render->filled_mv_blocks_num);
94         return -1;
95     }
96     if (render->allocated_mv_blocks   < 1 ||
97         render->allocated_data_blocks <  render->allocated_mv_blocks*mb_block_count ||
98         render->start_mv_blocks_num   >= render->allocated_mv_blocks                ||
99         render->next_free_data_block_num >
100                         render->allocated_data_blocks -
101                         mb_block_count*(render->allocated_mv_blocks-render->start_mv_blocks_num)) {
102         av_log(avctx, AV_LOG_ERROR,
103                "Rendering surface doesn't provide enough block structures to work with.\n");
104         return -1;
105     }
106
107     render->picture_structure = s->picture_structure;
108     render->flags             = s->first_field ? 0 : XVMC_SECOND_FIELD;
109     render->p_future_surface  = NULL;
110     render->p_past_surface    = NULL;
111
112     switch(s->pict_type) {
113         case  AV_PICTURE_TYPE_I:
114             return 0; // no prediction from other frames
115         case  AV_PICTURE_TYPE_B:
116             next = (struct xvmc_pix_fmt*)s->next_picture.f.data[2];
117             if (!next)
118                 return -1;
119             if (next->xvmc_id != AV_XVMC_ID)
120                 return -1;
121             render->p_future_surface = next->p_surface;
122             // no return here, going to set forward prediction
123         case  AV_PICTURE_TYPE_P:
124             last = (struct xvmc_pix_fmt*)s->last_picture.f.data[2];
125             if (!last)
126                 last = render; // predict second field from the first
127             if (last->xvmc_id != AV_XVMC_ID)
128                 return -1;
129             render->p_past_surface = last->p_surface;
130             return 0;
131     }
132
133 return -1;
134 }
135
136 /**
137  * Complete frame/field rendering by passing any remaining blocks.
138  * Normally ff_draw_horiz_band() is called for each slice, however,
139  * some leftover blocks, for example from error_resilience(), may remain.
140  * It should be safe to call the function a few times for the same field.
141  */
142 void ff_xvmc_field_end(MpegEncContext *s)
143 {
144     struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.f.data[2];
145     assert(render);
146
147     if (render->filled_mv_blocks_num > 0)
148         ff_draw_horiz_band(s, 0, 0);
149 }
150
151 /**
152  * Synthesize the data needed by XvMC to render one macroblock of data.
153  * Fill all relevant fields, if necessary do IDCT.
154  */
155 void ff_xvmc_decode_mb(MpegEncContext *s)
156 {
157     XvMCMacroBlock *mv_block;
158     struct xvmc_pix_fmt *render;
159     int i, cbp, blocks_per_mb;
160
161     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
162
163
164     if (s->encoding) {
165         av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
166         return;
167     }
168
169     // from MPV_decode_mb(), update DC predictors for P macroblocks
170     if (!s->mb_intra) {
171         s->last_dc[0] =
172         s->last_dc[1] =
173         s->last_dc[2] =  128 << s->intra_dc_precision;
174     }
175
176     // MC doesn't skip blocks
177     s->mb_skipped = 0;
178
179
180     // Do I need to export quant when I could not perform postprocessing?
181     // Anyway, it doesn't hurt.
182     s->current_picture.f.qscale_table[mb_xy] = s->qscale;
183
184     // start of XVMC-specific code
185     render = (struct xvmc_pix_fmt*)s->current_picture.f.data[2];
186     assert(render);
187     assert(render->xvmc_id == AV_XVMC_ID);
188     assert(render->mv_blocks);
189
190     // take the next free macroblock
191     mv_block = &render->mv_blocks[render->start_mv_blocks_num +
192                                   render->filled_mv_blocks_num];
193
194     mv_block->x        = s->mb_x;
195     mv_block->y        = s->mb_y;
196     mv_block->dct_type = s->interlaced_dct; // XVMC_DCT_TYPE_FRAME/FIELD;
197     if (s->mb_intra) {
198         mv_block->macroblock_type = XVMC_MB_TYPE_INTRA; // no MC, all done
199     } else {
200         mv_block->macroblock_type = XVMC_MB_TYPE_PATTERN;
201
202         if (s->mv_dir & MV_DIR_FORWARD) {
203             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_FORWARD;
204             // PMV[n][dir][xy] = mv[dir][n][xy]
205             mv_block->PMV[0][0][0] = s->mv[0][0][0];
206             mv_block->PMV[0][0][1] = s->mv[0][0][1];
207             mv_block->PMV[1][0][0] = s->mv[0][1][0];
208             mv_block->PMV[1][0][1] = s->mv[0][1][1];
209         }
210         if (s->mv_dir & MV_DIR_BACKWARD) {
211             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_BACKWARD;
212             mv_block->PMV[0][1][0] = s->mv[1][0][0];
213             mv_block->PMV[0][1][1] = s->mv[1][0][1];
214             mv_block->PMV[1][1][0] = s->mv[1][1][0];
215             mv_block->PMV[1][1][1] = s->mv[1][1][1];
216         }
217
218         switch(s->mv_type) {
219             case  MV_TYPE_16X16:
220                 mv_block->motion_type = XVMC_PREDICTION_FRAME;
221                 break;
222             case  MV_TYPE_16X8:
223                 mv_block->motion_type = XVMC_PREDICTION_16x8;
224                 break;
225             case  MV_TYPE_FIELD:
226                 mv_block->motion_type = XVMC_PREDICTION_FIELD;
227                 if (s->picture_structure == PICT_FRAME) {
228                     mv_block->PMV[0][0][1] <<= 1;
229                     mv_block->PMV[1][0][1] <<= 1;
230                     mv_block->PMV[0][1][1] <<= 1;
231                     mv_block->PMV[1][1][1] <<= 1;
232                 }
233                 break;
234             case  MV_TYPE_DMV:
235                 mv_block->motion_type = XVMC_PREDICTION_DUAL_PRIME;
236                 if (s->picture_structure == PICT_FRAME) {
237
238                     mv_block->PMV[0][0][0] = s->mv[0][0][0];      // top from top
239                     mv_block->PMV[0][0][1] = s->mv[0][0][1] << 1;
240
241                     mv_block->PMV[0][1][0] = s->mv[0][0][0];      // bottom from bottom
242                     mv_block->PMV[0][1][1] = s->mv[0][0][1] << 1;
243
244                     mv_block->PMV[1][0][0] = s->mv[0][2][0];      // dmv00, top from bottom
245                     mv_block->PMV[1][0][1] = s->mv[0][2][1] << 1; // dmv01
246
247                     mv_block->PMV[1][1][0] = s->mv[0][3][0];      // dmv10, bottom from top
248                     mv_block->PMV[1][1][1] = s->mv[0][3][1] << 1; // dmv11
249
250                 } else {
251                     mv_block->PMV[0][1][0] = s->mv[0][2][0];      // dmv00
252                     mv_block->PMV[0][1][1] = s->mv[0][2][1];      // dmv01
253                 }
254                 break;
255             default:
256                 assert(0);
257         }
258
259         mv_block->motion_vertical_field_select = 0;
260
261         // set correct field references
262         if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) {
263             mv_block->motion_vertical_field_select |= s->field_select[0][0];
264             mv_block->motion_vertical_field_select |= s->field_select[1][0] << 1;
265             mv_block->motion_vertical_field_select |= s->field_select[0][1] << 2;
266             mv_block->motion_vertical_field_select |= s->field_select[1][1] << 3;
267         }
268     } // !intra
269     // time to handle data blocks
270     mv_block->index = render->next_free_data_block_num;
271
272     blocks_per_mb = 6;
273     if (s->chroma_format >= 2) {
274         blocks_per_mb = 4 + (1 << s->chroma_format);
275     }
276
277     // calculate cbp
278     cbp = 0;
279     for (i = 0; i < blocks_per_mb; i++) {
280         cbp += cbp;
281         if (s->block_last_index[i] >= 0)
282             cbp++;
283     }
284
285     if (s->flags & CODEC_FLAG_GRAY) {
286         if (s->mb_intra) {                                   // intra frames are always full chroma blocks
287             for (i = 4; i < blocks_per_mb; i++) {
288                 memset(s->pblocks[i], 0, sizeof(*s->pblocks[i]));  // so we need to clear them
289                 if (!render->unsigned_intra)
290                     *s->pblocks[i][0] = 1 << 10;
291             }
292         } else {
293             cbp &= 0xf << (blocks_per_mb - 4);
294             blocks_per_mb = 4;                               // luminance blocks only
295         }
296     }
297     mv_block->coded_block_pattern = cbp;
298     if (cbp == 0)
299         mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN;
300
301     for (i = 0; i < blocks_per_mb; i++) {
302         if (s->block_last_index[i] >= 0) {
303             // I do not have unsigned_intra MOCO to test, hope it is OK.
304             if (s->mb_intra && (render->idct || !render->unsigned_intra))
305                 *s->pblocks[i][0] -= 1 << 10;
306             if (!render->idct) {
307                 s->dsp.idct(*s->pblocks[i]);
308                 /* It is unclear if MC hardware requires pixel diff values to be
309                  * in the range [-255;255]. TODO: Clipping if such hardware is
310                  * ever found. As of now it would only be an unnecessary
311                  * slowdown. */
312             }
313             // copy blocks only if the codec doesn't support pblocks reordering
314             if (s->avctx->xvmc_acceleration == 1) {
315                 memcpy(&render->data_blocks[render->next_free_data_block_num*64],
316                        s->pblocks[i], sizeof(*s->pblocks[i]));
317             }
318             render->next_free_data_block_num++;
319         }
320     }
321     render->filled_mv_blocks_num++;
322
323     assert(render->filled_mv_blocks_num     <= render->allocated_mv_blocks);
324     assert(render->next_free_data_block_num <= render->allocated_data_blocks);
325     /* The above conditions should not be able to fail as long as this function
326      * is used and the following 'if ()' automatically calls a callback to free
327      * blocks. */
328
329
330     if (render->filled_mv_blocks_num == render->allocated_mv_blocks)
331         ff_draw_horiz_band(s, 0, 0);
332 }