2 * XVideo Motion Compensation
3 * Copyright (c) 2003 Ivan Kalvachev
5 * This file is part of FFmpeg.
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.
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.
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
23 #include <X11/extensions/XvMC.h>
26 #include "mpegvideo.h"
32 #include "xvmc_internal.h"
38 * Initialize the block field of the MpegEncContext pointer passed as
39 * parameter after making sure that the data is not corrupted.
40 * In order to implement something like direct rendering instead of decoding
41 * coefficients in s->blocks and then copying them, copy them directly
42 * into the data_blocks array provided by xvmc.
44 void ff_xvmc_init_block(MpegEncContext *s)
46 struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.f.data[2];
47 assert(render && render->xvmc_id == AV_XVMC_ID);
49 s->block = (int16_t (*)[64])(render->data_blocks + render->next_free_data_block_num * 64);
53 * Fill individual block pointers, so there are no gaps in the data_block array
54 * in case not all blocks in the macroblock are coded.
56 void ff_xvmc_pack_pblocks(MpegEncContext *s, int cbp)
59 const int mb_block_count = 4 + (1 << s->chroma_format);
61 cbp <<= 12-mb_block_count;
62 for (i = 0; i < mb_block_count; i++) {
64 s->pblocks[i] = &s->block[j++];
72 * Find and store the surfaces that are used as reference frames.
73 * This function should be called for every new field and/or frame.
74 * It should be safe to call the function a few times for the same field.
76 int ff_xvmc_field_start(MpegEncContext *s, AVCodecContext *avctx)
78 struct xvmc_pix_fmt *last, *next, *render = (struct xvmc_pix_fmt*)s->current_picture.f.data[2];
79 const int mb_block_count = 4 + (1 << s->chroma_format);
82 if (!render || render->xvmc_id != AV_XVMC_ID ||
83 !render->data_blocks || !render->mv_blocks ||
84 (unsigned int)render->allocated_mv_blocks > INT_MAX/(64*6) ||
85 (unsigned int)render->allocated_data_blocks > INT_MAX/64 ||
87 av_log(avctx, AV_LOG_ERROR,
88 "Render token doesn't look as expected.\n");
89 return -1; // make sure that this is a render packet
92 if (render->filled_mv_blocks_num) {
93 av_log(avctx, AV_LOG_ERROR,
94 "Rendering surface contains %i unprocessed blocks.\n",
95 render->filled_mv_blocks_num);
98 if (render->allocated_mv_blocks < 1 ||
99 render->allocated_data_blocks < render->allocated_mv_blocks*mb_block_count ||
100 render->start_mv_blocks_num >= render->allocated_mv_blocks ||
101 render->next_free_data_block_num >
102 render->allocated_data_blocks -
103 mb_block_count*(render->allocated_mv_blocks-render->start_mv_blocks_num)) {
104 av_log(avctx, AV_LOG_ERROR,
105 "Rendering surface doesn't provide enough block structures to work with.\n");
109 render->picture_structure = s->picture_structure;
110 render->flags = s->first_field ? 0 : XVMC_SECOND_FIELD;
111 render->p_future_surface = NULL;
112 render->p_past_surface = NULL;
114 switch(s->pict_type) {
115 case AV_PICTURE_TYPE_I:
116 return 0; // no prediction from other frames
117 case AV_PICTURE_TYPE_B:
118 next = (struct xvmc_pix_fmt*)s->next_picture.f.data[2];
121 if (next->xvmc_id != AV_XVMC_ID)
123 render->p_future_surface = next->p_surface;
124 // no return here, going to set forward prediction
125 case AV_PICTURE_TYPE_P:
126 last = (struct xvmc_pix_fmt*)s->last_picture.f.data[2];
128 last = render; // predict second field from the first
129 if (last->xvmc_id != AV_XVMC_ID)
131 render->p_past_surface = last->p_surface;
139 * Complete frame/field rendering by passing any remaining blocks.
140 * Normally ff_draw_horiz_band() is called for each slice, however,
141 * some leftover blocks, for example from error_resilience(), may remain.
142 * It should be safe to call the function a few times for the same field.
144 void ff_xvmc_field_end(MpegEncContext *s)
146 struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.f.data[2];
149 if (render->filled_mv_blocks_num > 0)
150 ff_mpeg_draw_horiz_band(s, 0, 0);
154 * Synthesize the data needed by XvMC to render one macroblock of data.
155 * Fill all relevant fields, if necessary do IDCT.
157 void ff_xvmc_decode_mb(MpegEncContext *s)
159 XvMCMacroBlock *mv_block;
160 struct xvmc_pix_fmt *render;
161 int i, cbp, blocks_per_mb;
163 const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
167 av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
171 // from MPV_decode_mb(), update DC predictors for P macroblocks
175 s->last_dc[2] = 128 << s->intra_dc_precision;
178 // MC doesn't skip blocks
182 // Do I need to export quant when I could not perform postprocessing?
183 // Anyway, it doesn't hurt.
184 s->current_picture.qscale_table[mb_xy] = s->qscale;
186 // start of XVMC-specific code
187 render = (struct xvmc_pix_fmt*)s->current_picture.f.data[2];
189 assert(render->xvmc_id == AV_XVMC_ID);
190 assert(render->mv_blocks);
192 // take the next free macroblock
193 mv_block = &render->mv_blocks[render->start_mv_blocks_num +
194 render->filled_mv_blocks_num];
196 mv_block->x = s->mb_x;
197 mv_block->y = s->mb_y;
198 mv_block->dct_type = s->interlaced_dct; // XVMC_DCT_TYPE_FRAME/FIELD;
200 mv_block->macroblock_type = XVMC_MB_TYPE_INTRA; // no MC, all done
202 mv_block->macroblock_type = XVMC_MB_TYPE_PATTERN;
204 if (s->mv_dir & MV_DIR_FORWARD) {
205 mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_FORWARD;
206 // PMV[n][dir][xy] = mv[dir][n][xy]
207 mv_block->PMV[0][0][0] = s->mv[0][0][0];
208 mv_block->PMV[0][0][1] = s->mv[0][0][1];
209 mv_block->PMV[1][0][0] = s->mv[0][1][0];
210 mv_block->PMV[1][0][1] = s->mv[0][1][1];
212 if (s->mv_dir & MV_DIR_BACKWARD) {
213 mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_BACKWARD;
214 mv_block->PMV[0][1][0] = s->mv[1][0][0];
215 mv_block->PMV[0][1][1] = s->mv[1][0][1];
216 mv_block->PMV[1][1][0] = s->mv[1][1][0];
217 mv_block->PMV[1][1][1] = s->mv[1][1][1];
222 mv_block->motion_type = XVMC_PREDICTION_FRAME;
225 mv_block->motion_type = XVMC_PREDICTION_16x8;
228 mv_block->motion_type = XVMC_PREDICTION_FIELD;
229 if (s->picture_structure == PICT_FRAME) {
230 mv_block->PMV[0][0][1] <<= 1;
231 mv_block->PMV[1][0][1] <<= 1;
232 mv_block->PMV[0][1][1] <<= 1;
233 mv_block->PMV[1][1][1] <<= 1;
237 mv_block->motion_type = XVMC_PREDICTION_DUAL_PRIME;
238 if (s->picture_structure == PICT_FRAME) {
240 mv_block->PMV[0][0][0] = s->mv[0][0][0]; // top from top
241 mv_block->PMV[0][0][1] = s->mv[0][0][1] << 1;
243 mv_block->PMV[0][1][0] = s->mv[0][0][0]; // bottom from bottom
244 mv_block->PMV[0][1][1] = s->mv[0][0][1] << 1;
246 mv_block->PMV[1][0][0] = s->mv[0][2][0]; // dmv00, top from bottom
247 mv_block->PMV[1][0][1] = s->mv[0][2][1] << 1; // dmv01
249 mv_block->PMV[1][1][0] = s->mv[0][3][0]; // dmv10, bottom from top
250 mv_block->PMV[1][1][1] = s->mv[0][3][1] << 1; // dmv11
253 mv_block->PMV[0][1][0] = s->mv[0][2][0]; // dmv00
254 mv_block->PMV[0][1][1] = s->mv[0][2][1]; // dmv01
261 mv_block->motion_vertical_field_select = 0;
263 // set correct field references
264 if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) {
265 mv_block->motion_vertical_field_select |= s->field_select[0][0];
266 mv_block->motion_vertical_field_select |= s->field_select[1][0] << 1;
267 mv_block->motion_vertical_field_select |= s->field_select[0][1] << 2;
268 mv_block->motion_vertical_field_select |= s->field_select[1][1] << 3;
271 // time to handle data blocks
272 mv_block->index = render->next_free_data_block_num;
275 if (s->chroma_format >= 2) {
276 blocks_per_mb = 4 + (1 << s->chroma_format);
281 for (i = 0; i < blocks_per_mb; i++) {
283 if (s->block_last_index[i] >= 0)
287 if (s->flags & CODEC_FLAG_GRAY) {
288 if (s->mb_intra) { // intra frames are always full chroma blocks
289 for (i = 4; i < blocks_per_mb; i++) {
290 memset(s->pblocks[i], 0, sizeof(*s->pblocks[i])); // so we need to clear them
291 if (!render->unsigned_intra)
292 *s->pblocks[i][0] = 1 << 10;
295 cbp &= 0xf << (blocks_per_mb - 4);
296 blocks_per_mb = 4; // luminance blocks only
299 mv_block->coded_block_pattern = cbp;
301 mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN;
303 for (i = 0; i < blocks_per_mb; i++) {
304 if (s->block_last_index[i] >= 0) {
305 // I do not have unsigned_intra MOCO to test, hope it is OK.
306 if (s->mb_intra && (render->idct || !render->unsigned_intra))
307 *s->pblocks[i][0] -= 1 << 10;
309 s->dsp.idct(*s->pblocks[i]);
310 /* It is unclear if MC hardware requires pixel diff values to be
311 * in the range [-255;255]. TODO: Clipping if such hardware is
312 * ever found. As of now it would only be an unnecessary
315 // copy blocks only if the codec doesn't support pblocks reordering
316 if (s->avctx->xvmc_acceleration == 1) {
317 memcpy(&render->data_blocks[render->next_free_data_block_num*64],
318 s->pblocks[i], sizeof(*s->pblocks[i]));
320 render->next_free_data_block_num++;
323 render->filled_mv_blocks_num++;
325 assert(render->filled_mv_blocks_num <= render->allocated_mv_blocks);
326 assert(render->next_free_data_block_num <= render->allocated_data_blocks);
327 /* The above conditions should not be able to fail as long as this function
328 * is used and the following 'if ()' automatically calls a callback to free
332 if (render->filled_mv_blocks_num == render->allocated_mv_blocks)
333 ff_mpeg_draw_horiz_band(s, 0, 0);
336 #endif /* FF_API_XVMC */