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/libavcodec/mpegvideo_xvmc.c

http://github.com/FFmpeg/FFmpeg
C | 376 lines | 263 code | 47 blank | 66 comment | 53 complexity | 964ee8ed28a6dcebc7b38ef652eaf311 MD5 | raw file
  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 "mpegutils.h"
 27#include "mpegvideo.h"
 28
 29#undef NDEBUG
 30#include <assert.h>
 31
 32#include "xvmc.h"
 33#include "xvmc_internal.h"
 34#include "version.h"
 35
 36/**
 37 * Initialize the block field of the MpegEncContext pointer passed as
 38 * parameter after making sure that the data is not corrupted.
 39 * In order to implement something like direct rendering instead of decoding
 40 * coefficients in s->blocks and then copying them, copy them directly
 41 * into the data_blocks array provided by xvmc.
 42 */
 43void ff_xvmc_init_block(MpegEncContext *s)
 44{
 45    struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.f->data[2];
 46    assert(render && render->xvmc_id == AV_XVMC_ID);
 47
 48    s->block = (int16_t (*)[64])(render->data_blocks + render->next_free_data_block_num * 64);
 49}
 50
 51static void exchange_uv(MpegEncContext *s)
 52{
 53    int16_t (*tmp)[64];
 54
 55    tmp           = s->pblocks[4];
 56    s->pblocks[4] = s->pblocks[5];
 57    s->pblocks[5] = tmp;
 58}
 59
 60/**
 61 * Fill individual block pointers, so there are no gaps in the data_block array
 62 * in case not all blocks in the macroblock are coded.
 63 */
 64void ff_xvmc_pack_pblocks(MpegEncContext *s, int cbp)
 65{
 66    int i, j = 0;
 67    const int mb_block_count = 4 + (1 << s->chroma_format);
 68
 69    cbp <<= 12-mb_block_count;
 70    for (i = 0; i < mb_block_count; i++) {
 71        if (cbp & (1 << 11))
 72            s->pblocks[i] = &s->block[j++];
 73        else
 74            s->pblocks[i] = NULL;
 75        cbp += cbp;
 76    }
 77    if (s->swap_uv) {
 78        exchange_uv(s);
 79    }
 80}
 81
 82/**
 83 * Find and store the surfaces that are used as reference frames.
 84 * This function should be called for every new field and/or frame.
 85 * It should be safe to call the function a few times for the same field.
 86 */
 87static int ff_xvmc_field_start(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
 88{
 89    struct MpegEncContext *s = avctx->priv_data;
 90    struct xvmc_pix_fmt *last, *next, *render = (struct xvmc_pix_fmt*)s->current_picture.f->data[2];
 91    const int mb_block_count = 4 + (1 << s->chroma_format);
 92
 93    assert(avctx);
 94    if (!render || render->xvmc_id != AV_XVMC_ID ||
 95        !render->data_blocks || !render->mv_blocks ||
 96        (unsigned int)render->allocated_mv_blocks   > INT_MAX/(64*6) ||
 97        (unsigned int)render->allocated_data_blocks > INT_MAX/64     ||
 98        !render->p_surface) {
 99        av_log(avctx, AV_LOG_ERROR,
100               "Render token doesn't look as expected.\n");
101        return -1; // make sure that this is a render packet
102    }
103
104    if (render->filled_mv_blocks_num) {
105        av_log(avctx, AV_LOG_ERROR,
106               "Rendering surface contains %i unprocessed blocks.\n",
107               render->filled_mv_blocks_num);
108        return -1;
109    }
110    if (render->allocated_mv_blocks   < 1 ||
111        render->allocated_data_blocks <  render->allocated_mv_blocks*mb_block_count ||
112        render->start_mv_blocks_num   >= render->allocated_mv_blocks                ||
113        render->next_free_data_block_num >
114                        render->allocated_data_blocks -
115                        mb_block_count*(render->allocated_mv_blocks-render->start_mv_blocks_num)) {
116        av_log(avctx, AV_LOG_ERROR,
117               "Rendering surface doesn't provide enough block structures to work with.\n");
118        return -1;
119    }
120
121    render->picture_structure = s->picture_structure;
122    render->flags             = s->first_field ? 0 : XVMC_SECOND_FIELD;
123    render->p_future_surface  = NULL;
124    render->p_past_surface    = NULL;
125
126    switch(s->pict_type) {
127        case  AV_PICTURE_TYPE_I:
128            return 0; // no prediction from other frames
129        case  AV_PICTURE_TYPE_B:
130            next = (struct xvmc_pix_fmt*)s->next_picture.f->data[2];
131            if (!next)
132                return -1;
133            if (next->xvmc_id != AV_XVMC_ID)
134                return -1;
135            render->p_future_surface = next->p_surface;
136            // no return here, going to set forward prediction
137        case  AV_PICTURE_TYPE_P:
138            last = (struct xvmc_pix_fmt*)s->last_picture.f->data[2];
139            if (!last)
140                last = render; // predict second field from the first
141            if (last->xvmc_id != AV_XVMC_ID)
142                return -1;
143            render->p_past_surface = last->p_surface;
144            return 0;
145    }
146
147return -1;
148}
149
150/**
151 * Complete frame/field rendering by passing any remaining blocks.
152 * Normally ff_draw_horiz_band() is called for each slice, however,
153 * some leftover blocks, for example from error_resilience(), may remain.
154 * It should be safe to call the function a few times for the same field.
155 */
156static int ff_xvmc_field_end(AVCodecContext *avctx)
157{
158    struct MpegEncContext *s = avctx->priv_data;
159    struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.f->data[2];
160    assert(render);
161
162    if (render->filled_mv_blocks_num > 0)
163        ff_mpeg_draw_horiz_band(s, 0, 0);
164    return 0;
165}
166
167/**
168 * Synthesize the data needed by XvMC to render one macroblock of data.
169 * Fill all relevant fields, if necessary do IDCT.
170 */
171static void ff_xvmc_decode_mb(struct MpegEncContext *s)
172{
173    XvMCMacroBlock *mv_block;
174    struct xvmc_pix_fmt *render;
175    int i, cbp, blocks_per_mb;
176
177    const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
178
179
180    if (s->encoding) {
181        av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
182        return;
183    }
184
185    // from ff_mpv_reconstruct_mb(), update DC predictors for P macroblocks
186    if (!s->mb_intra) {
187        s->last_dc[0] =
188        s->last_dc[1] =
189        s->last_dc[2] =  128 << s->intra_dc_precision;
190    }
191
192    // MC doesn't skip blocks
193    s->mb_skipped = 0;
194
195
196    // Do I need to export quant when I could not perform postprocessing?
197    // Anyway, it doesn't hurt.
198    s->current_picture.qscale_table[mb_xy] = s->qscale;
199
200    // start of XVMC-specific code
201    render = (struct xvmc_pix_fmt*)s->current_picture.f->data[2];
202    assert(render);
203    assert(render->xvmc_id == AV_XVMC_ID);
204    assert(render->mv_blocks);
205
206    // take the next free macroblock
207    mv_block = &render->mv_blocks[render->start_mv_blocks_num +
208                                  render->filled_mv_blocks_num];
209
210    mv_block->x        = s->mb_x;
211    mv_block->y        = s->mb_y;
212    mv_block->dct_type = s->interlaced_dct; // XVMC_DCT_TYPE_FRAME/FIELD;
213    if (s->mb_intra) {
214        mv_block->macroblock_type = XVMC_MB_TYPE_INTRA; // no MC, all done
215    } else {
216        mv_block->macroblock_type = XVMC_MB_TYPE_PATTERN;
217
218        if (s->mv_dir & MV_DIR_FORWARD) {
219            mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_FORWARD;
220            // PMV[n][dir][xy] = mv[dir][n][xy]
221            mv_block->PMV[0][0][0] = s->mv[0][0][0];
222            mv_block->PMV[0][0][1] = s->mv[0][0][1];
223            mv_block->PMV[1][0][0] = s->mv[0][1][0];
224            mv_block->PMV[1][0][1] = s->mv[0][1][1];
225        }
226        if (s->mv_dir & MV_DIR_BACKWARD) {
227            mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_BACKWARD;
228            mv_block->PMV[0][1][0] = s->mv[1][0][0];
229            mv_block->PMV[0][1][1] = s->mv[1][0][1];
230            mv_block->PMV[1][1][0] = s->mv[1][1][0];
231            mv_block->PMV[1][1][1] = s->mv[1][1][1];
232        }
233
234        switch(s->mv_type) {
235            case  MV_TYPE_16X16:
236                mv_block->motion_type = XVMC_PREDICTION_FRAME;
237                break;
238            case  MV_TYPE_16X8:
239                mv_block->motion_type = XVMC_PREDICTION_16x8;
240                break;
241            case  MV_TYPE_FIELD:
242                mv_block->motion_type = XVMC_PREDICTION_FIELD;
243                if (s->picture_structure == PICT_FRAME) {
244                    mv_block->PMV[0][0][1] <<= 1;
245                    mv_block->PMV[1][0][1] <<= 1;
246                    mv_block->PMV[0][1][1] <<= 1;
247                    mv_block->PMV[1][1][1] <<= 1;
248                }
249                break;
250            case  MV_TYPE_DMV:
251                mv_block->motion_type = XVMC_PREDICTION_DUAL_PRIME;
252                if (s->picture_structure == PICT_FRAME) {
253
254                    mv_block->PMV[0][0][0] = s->mv[0][0][0];      // top from top
255                    mv_block->PMV[0][0][1] = s->mv[0][0][1] << 1;
256
257                    mv_block->PMV[0][1][0] = s->mv[0][0][0];      // bottom from bottom
258                    mv_block->PMV[0][1][1] = s->mv[0][0][1] << 1;
259
260                    mv_block->PMV[1][0][0] = s->mv[0][2][0];      // dmv00, top from bottom
261                    mv_block->PMV[1][0][1] = s->mv[0][2][1] << 1; // dmv01
262
263                    mv_block->PMV[1][1][0] = s->mv[0][3][0];      // dmv10, bottom from top
264                    mv_block->PMV[1][1][1] = s->mv[0][3][1] << 1; // dmv11
265
266                } else {
267                    mv_block->PMV[0][1][0] = s->mv[0][2][0];      // dmv00
268                    mv_block->PMV[0][1][1] = s->mv[0][2][1];      // dmv01
269                }
270                break;
271            default:
272                assert(0);
273        }
274
275        mv_block->motion_vertical_field_select = 0;
276
277        // set correct field references
278        if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) {
279            mv_block->motion_vertical_field_select |= s->field_select[0][0];
280            mv_block->motion_vertical_field_select |= s->field_select[1][0] << 1;
281            mv_block->motion_vertical_field_select |= s->field_select[0][1] << 2;
282            mv_block->motion_vertical_field_select |= s->field_select[1][1] << 3;
283        }
284    } // !intra
285    // time to handle data blocks
286    mv_block->index = render->next_free_data_block_num;
287
288    blocks_per_mb = 6;
289    if (s->chroma_format >= 2) {
290        blocks_per_mb = 4 + (1 << s->chroma_format);
291    }
292
293    // calculate cbp
294    cbp = 0;
295    for (i = 0; i < blocks_per_mb; i++) {
296        cbp += cbp;
297        if (s->block_last_index[i] >= 0)
298            cbp++;
299    }
300
301    if (s->avctx->flags & AV_CODEC_FLAG_GRAY) {
302        if (s->mb_intra) {                                   // intra frames are always full chroma blocks
303            for (i = 4; i < blocks_per_mb; i++) {
304                memset(s->pblocks[i], 0, sizeof(*s->pblocks[i]));  // so we need to clear them
305                if (!render->unsigned_intra)
306                    *s->pblocks[i][0] = 1 << 10;
307            }
308        } else {
309            cbp &= 0xf << (blocks_per_mb - 4);
310            blocks_per_mb = 4;                               // luminance blocks only
311        }
312    }
313    mv_block->coded_block_pattern = cbp;
314    if (cbp == 0)
315        mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN;
316
317    for (i = 0; i < blocks_per_mb; i++) {
318        if (s->block_last_index[i] >= 0) {
319            // I do not have unsigned_intra MOCO to test, hope it is OK.
320            if (s->mb_intra && (render->idct || !render->unsigned_intra))
321                *s->pblocks[i][0] -= 1 << 10;
322            if (!render->idct) {
323                s->idsp.idct(*s->pblocks[i]);
324                /* It is unclear if MC hardware requires pixel diff values to be
325                 * in the range [-255;255]. TODO: Clipping if such hardware is
326                 * ever found. As of now it would only be an unnecessary
327                 * slowdown. */
328            }
329            // copy blocks only if the codec doesn't support pblocks reordering
330            if (!s->pack_pblocks) {
331                memcpy(&render->data_blocks[render->next_free_data_block_num*64],
332                       s->pblocks[i], sizeof(*s->pblocks[i]));
333            }
334            render->next_free_data_block_num++;
335        }
336    }
337    render->filled_mv_blocks_num++;
338
339    assert(render->filled_mv_blocks_num     <= render->allocated_mv_blocks);
340    assert(render->next_free_data_block_num <= render->allocated_data_blocks);
341    /* The above conditions should not be able to fail as long as this function
342     * is used and the following 'if ()' automatically calls a callback to free
343     * blocks. */
344
345
346    if (render->filled_mv_blocks_num == render->allocated_mv_blocks)
347        ff_mpeg_draw_horiz_band(s, 0, 0);
348}
349
350#if CONFIG_MPEG1_XVMC_HWACCEL
351const AVHWAccel ff_mpeg1_xvmc_hwaccel = {
352    .name           = "mpeg1_xvmc",
353    .type           = AVMEDIA_TYPE_VIDEO,
354    .id             = AV_CODEC_ID_MPEG1VIDEO,
355    .pix_fmt        = AV_PIX_FMT_XVMC,
356    .start_frame    = ff_xvmc_field_start,
357    .end_frame      = ff_xvmc_field_end,
358    .decode_slice   = NULL,
359    .decode_mb      = ff_xvmc_decode_mb,
360    .priv_data_size = 0,
361};
362#endif
363
364#if CONFIG_MPEG2_XVMC_HWACCEL
365const AVHWAccel ff_mpeg2_xvmc_hwaccel = {
366    .name           = "mpeg2_xvmc",
367    .type           = AVMEDIA_TYPE_VIDEO,
368    .id             = AV_CODEC_ID_MPEG2VIDEO,
369    .pix_fmt        = AV_PIX_FMT_XVMC,
370    .start_frame    = ff_xvmc_field_start,
371    .end_frame      = ff_xvmc_field_end,
372    .decode_slice   = NULL,
373    .decode_mb      = ff_xvmc_decode_mb,
374    .priv_data_size = 0,
375};
376#endif