2 * XVideo Motion Compensation
3 * Copyright (c) 2003 Ivan Kalvachev
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include <X11/extensions/XvMC.h>
26 #include "mpegutils.h"
27 #include "mpegvideo.h"
33 #include "xvmc_internal.h"
39 * Initialize the block field of the MpegEncContext pointer passed as
40 * parameter after making sure that the data is not corrupted.
41 * In order to implement something like direct rendering instead of decoding
42 * coefficients in s->blocks and then copying them, copy them directly
43 * into the data_blocks array provided by xvmc.
45 void ff_xvmc_init_block(MpegEncContext *s)
47 struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.f->data[2];
48 assert(render && render->xvmc_id == AV_XVMC_ID);
50 s->block = (int16_t (*)[64])(render->data_blocks + render->next_free_data_block_num * 64);
54 * Fill individual block pointers, so there are no gaps in the data_block array
55 * in case not all blocks in the macroblock are coded.
57 void ff_xvmc_pack_pblocks(MpegEncContext *s, int cbp)
60 const int mb_block_count = 4 + (1 << s->chroma_format);
62 cbp <<= 12-mb_block_count;
63 for (i = 0; i < mb_block_count; i++) {
65 s->pblocks[i] = &s->block[j++];
73 * Find and store the surfaces that are used as reference frames.
74 * This function should be called for every new field and/or frame.
75 * It should be safe to call the function a few times for the same field.
77 int ff_xvmc_field_start(MpegEncContext *s, AVCodecContext *avctx)
79 struct xvmc_pix_fmt *last, *next, *render = (struct xvmc_pix_fmt*)s->current_picture.f->data[2];
80 const int mb_block_count = 4 + (1 << s->chroma_format);
83 if (!render || render->xvmc_id != AV_XVMC_ID ||
84 !render->data_blocks || !render->mv_blocks ||
85 (unsigned int)render->allocated_mv_blocks > INT_MAX/(64*6) ||
86 (unsigned int)render->allocated_data_blocks > INT_MAX/64 ||
88 av_log(avctx, AV_LOG_ERROR,
89 "Render token doesn't look as expected.\n");
90 return -1; // make sure that this is a render packet
93 if (render->filled_mv_blocks_num) {
94 av_log(avctx, AV_LOG_ERROR,
95 "Rendering surface contains %i unprocessed blocks.\n",
96 render->filled_mv_blocks_num);
99 if (render->allocated_mv_blocks < 1 ||
100 render->allocated_data_blocks < render->allocated_mv_blocks*mb_block_count ||
101 render->start_mv_blocks_num >= render->allocated_mv_blocks ||
102 render->next_free_data_block_num >
103 render->allocated_data_blocks -
104 mb_block_count*(render->allocated_mv_blocks-render->start_mv_blocks_num)) {
105 av_log(avctx, AV_LOG_ERROR,
106 "Rendering surface doesn't provide enough block structures to work with.\n");
110 render->picture_structure = s->picture_structure;
111 render->flags = s->first_field ? 0 : XVMC_SECOND_FIELD;
112 render->p_future_surface = NULL;
113 render->p_past_surface = NULL;
115 switch(s->pict_type) {
116 case AV_PICTURE_TYPE_I:
117 return 0; // no prediction from other frames
118 case AV_PICTURE_TYPE_B:
119 next = (struct xvmc_pix_fmt*)s->next_picture.f->data[2];
122 if (next->xvmc_id != AV_XVMC_ID)
124 render->p_future_surface = next->p_surface;
125 // no return here, going to set forward prediction
126 case AV_PICTURE_TYPE_P:
127 last = (struct xvmc_pix_fmt*)s->last_picture.f->data[2];
129 last = render; // predict second field from the first
130 if (last->xvmc_id != AV_XVMC_ID)
132 render->p_past_surface = last->p_surface;
140 * Complete frame/field rendering by passing any remaining blocks.
141 * Normally ff_draw_horiz_band() is called for each slice, however,
142 * some leftover blocks, for example from error_resilience(), may remain.
143 * It should be safe to call the function a few times for the same field.
145 void ff_xvmc_field_end(MpegEncContext *s)
147 struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.f->data[2];
150 if (render->filled_mv_blocks_num > 0)
151 ff_mpeg_draw_horiz_band(s, 0, 0);
155 * Synthesize the data needed by XvMC to render one macroblock of data.
156 * Fill all relevant fields, if necessary do IDCT.
158 void ff_xvmc_decode_mb(MpegEncContext *s)
160 XvMCMacroBlock *mv_block;
161 struct xvmc_pix_fmt *render;
162 int i, cbp, blocks_per_mb;
164 const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
168 av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
172 // from ff_mpv_decode_mb(), update DC predictors for P macroblocks
176 s->last_dc[2] = 128 << s->intra_dc_precision;
179 // MC doesn't skip blocks
183 // Do I need to export quant when I could not perform postprocessing?
184 // Anyway, it doesn't hurt.
185 s->current_picture.qscale_table[mb_xy] = s->qscale;
187 // start of XVMC-specific code
188 render = (struct xvmc_pix_fmt*)s->current_picture.f->data[2];
190 assert(render->xvmc_id == AV_XVMC_ID);
191 assert(render->mv_blocks);
193 // take the next free macroblock
194 mv_block = &render->mv_blocks[render->start_mv_blocks_num +
195 render->filled_mv_blocks_num];
197 mv_block->x = s->mb_x;
198 mv_block->y = s->mb_y;
199 mv_block->dct_type = s->interlaced_dct; // XVMC_DCT_TYPE_FRAME/FIELD;
201 mv_block->macroblock_type = XVMC_MB_TYPE_INTRA; // no MC, all done
203 mv_block->macroblock_type = XVMC_MB_TYPE_PATTERN;
205 if (s->mv_dir & MV_DIR_FORWARD) {
206 mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_FORWARD;
207 // PMV[n][dir][xy] = mv[dir][n][xy]
208 mv_block->PMV[0][0][0] = s->mv[0][0][0];
209 mv_block->PMV[0][0][1] = s->mv[0][0][1];
210 mv_block->PMV[1][0][0] = s->mv[0][1][0];
211 mv_block->PMV[1][0][1] = s->mv[0][1][1];
213 if (s->mv_dir & MV_DIR_BACKWARD) {
214 mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_BACKWARD;
215 mv_block->PMV[0][1][0] = s->mv[1][0][0];
216 mv_block->PMV[0][1][1] = s->mv[1][0][1];
217 mv_block->PMV[1][1][0] = s->mv[1][1][0];
218 mv_block->PMV[1][1][1] = s->mv[1][1][1];
223 mv_block->motion_type = XVMC_PREDICTION_FRAME;
226 mv_block->motion_type = XVMC_PREDICTION_16x8;
229 mv_block->motion_type = XVMC_PREDICTION_FIELD;
230 if (s->picture_structure == PICT_FRAME) {
231 mv_block->PMV[0][0][1] <<= 1;
232 mv_block->PMV[1][0][1] <<= 1;
233 mv_block->PMV[0][1][1] <<= 1;
234 mv_block->PMV[1][1][1] <<= 1;
238 mv_block->motion_type = XVMC_PREDICTION_DUAL_PRIME;
239 if (s->picture_structure == PICT_FRAME) {
241 mv_block->PMV[0][0][0] = s->mv[0][0][0]; // top from top
242 mv_block->PMV[0][0][1] = s->mv[0][0][1] << 1;
244 mv_block->PMV[0][1][0] = s->mv[0][0][0]; // bottom from bottom
245 mv_block->PMV[0][1][1] = s->mv[0][0][1] << 1;
247 mv_block->PMV[1][0][0] = s->mv[0][2][0]; // dmv00, top from bottom
248 mv_block->PMV[1][0][1] = s->mv[0][2][1] << 1; // dmv01
250 mv_block->PMV[1][1][0] = s->mv[0][3][0]; // dmv10, bottom from top
251 mv_block->PMV[1][1][1] = s->mv[0][3][1] << 1; // dmv11
254 mv_block->PMV[0][1][0] = s->mv[0][2][0]; // dmv00
255 mv_block->PMV[0][1][1] = s->mv[0][2][1]; // dmv01
262 mv_block->motion_vertical_field_select = 0;
264 // set correct field references
265 if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) {
266 mv_block->motion_vertical_field_select |= s->field_select[0][0];
267 mv_block->motion_vertical_field_select |= s->field_select[1][0] << 1;
268 mv_block->motion_vertical_field_select |= s->field_select[0][1] << 2;
269 mv_block->motion_vertical_field_select |= s->field_select[1][1] << 3;
272 // time to handle data blocks
273 mv_block->index = render->next_free_data_block_num;
276 if (s->chroma_format >= 2) {
277 blocks_per_mb = 4 + (1 << s->chroma_format);
282 for (i = 0; i < blocks_per_mb; i++) {
284 if (s->block_last_index[i] >= 0)
288 if (s->avctx->flags & AV_CODEC_FLAG_GRAY) {
289 if (s->mb_intra) { // intra frames are always full chroma blocks
290 for (i = 4; i < blocks_per_mb; i++) {
291 memset(s->pblocks[i], 0, sizeof(*s->pblocks[i])); // so we need to clear them
292 if (!render->unsigned_intra)
293 *s->pblocks[i][0] = 1 << 10;
296 cbp &= 0xf << (blocks_per_mb - 4);
297 blocks_per_mb = 4; // luminance blocks only
300 mv_block->coded_block_pattern = cbp;
302 mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN;
304 for (i = 0; i < blocks_per_mb; i++) {
305 if (s->block_last_index[i] >= 0) {
306 // I do not have unsigned_intra MOCO to test, hope it is OK.
307 if (s->mb_intra && (render->idct || !render->unsigned_intra))
308 *s->pblocks[i][0] -= 1 << 10;
310 s->idsp.idct(*s->pblocks[i]);
311 /* It is unclear if MC hardware requires pixel diff values to be
312 * in the range [-255;255]. TODO: Clipping if such hardware is
313 * ever found. As of now it would only be an unnecessary
316 // copy blocks only if the codec doesn't support pblocks reordering
317 if (s->avctx->xvmc_acceleration == 1) {
318 memcpy(&render->data_blocks[render->next_free_data_block_num*64],
319 s->pblocks[i], sizeof(*s->pblocks[i]));
321 render->next_free_data_block_num++;
324 render->filled_mv_blocks_num++;
326 assert(render->filled_mv_blocks_num <= render->allocated_mv_blocks);
327 assert(render->next_free_data_block_num <= render->allocated_data_blocks);
328 /* The above conditions should not be able to fail as long as this function
329 * is used and the following 'if ()' automatically calls a callback to free
333 if (render->filled_mv_blocks_num == render->allocated_mv_blocks)
334 ff_mpeg_draw_horiz_band(s, 0, 0);
337 #endif /* FF_API_XVMC */