roqvideoenc.c
Go to the documentation of this file.
1 /*
2  * RoQ Video Encoder.
3  *
4  * Copyright (C) 2007 Vitor Sessak <vitor1001@gmail.com>
5  * Copyright (C) 2004-2007 Eric Lasota
6  * Based on RoQ specs (C) 2001 Tim Ferguson
7  *
8  * This file is part of Libav.
9  *
10  * Libav is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU Lesser General Public
12  * License as published by the Free Software Foundation; either
13  * version 2.1 of the License, or (at your option) any later version.
14  *
15  * Libav is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18  * Lesser General Public License for more details.
19  *
20  * You should have received a copy of the GNU Lesser General Public
21  * License along with Libav; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23  */
24 
31 /*
32  * COSTS:
33  * Level 1:
34  * SKIP - 2 bits
35  * MOTION - 2 + 8 bits
36  * CODEBOOK - 2 + 8 bits
37  * SUBDIVIDE - 2 + combined subcel cost
38  *
39  * Level 2:
40  * SKIP - 2 bits
41  * MOTION - 2 + 8 bits
42  * CODEBOOK - 2 + 8 bits
43  * SUBDIVIDE - 2 + 4*8 bits
44  *
45  * Maximum cost: 138 bits per cel
46  *
47  * Proper evaluation requires LCD fraction comparison, which requires
48  * Squared Error (SE) loss * savings increase
49  *
50  * Maximum savings increase: 136 bits
51  * Maximum SE loss without overflow: 31580641
52  * Components in 8x8 supercel: 192
53  * Maximum SE precision per component: 164482
54  * >65025, so no truncation is needed (phew)
55  */
56 
57 #include <string.h>
58 
59 #include "roqvideo.h"
60 #include "bytestream.h"
61 #include "elbg.h"
62 #include "mathops.h"
63 
64 #define CHROMA_BIAS 1
65 
70 #define MAX_CBS_4x4 255
71 
72 #define MAX_CBS_2x2 256
73 
74 /* The cast is useful when multiplying it by INT_MAX */
75 #define ROQ_LAMBDA_SCALE ((uint64_t) FF_LAMBDA_SCALE)
76 
77 /* Macroblock support functions */
78 static void unpack_roq_cell(roq_cell *cell, uint8_t u[4*3])
79 {
80  memcpy(u , cell->y, 4);
81  memset(u+4, cell->u, 4);
82  memset(u+8, cell->v, 4);
83 }
84 
85 static void unpack_roq_qcell(uint8_t cb2[], roq_qcell *qcell, uint8_t u[4*4*3])
86 {
87  int i,cp;
88  static const int offsets[4] = {0, 2, 8, 10};
89 
90  for (cp=0; cp<3; cp++)
91  for (i=0; i<4; i++) {
92  u[4*4*cp + offsets[i] ] = cb2[qcell->idx[i]*2*2*3 + 4*cp ];
93  u[4*4*cp + offsets[i]+1] = cb2[qcell->idx[i]*2*2*3 + 4*cp+1];
94  u[4*4*cp + offsets[i]+4] = cb2[qcell->idx[i]*2*2*3 + 4*cp+2];
95  u[4*4*cp + offsets[i]+5] = cb2[qcell->idx[i]*2*2*3 + 4*cp+3];
96  }
97 }
98 
99 
100 static void enlarge_roq_mb4(uint8_t base[3*16], uint8_t u[3*64])
101 {
102  int x,y,cp;
103 
104  for(cp=0; cp<3; cp++)
105  for(y=0; y<8; y++)
106  for(x=0; x<8; x++)
107  *u++ = base[(y/2)*4 + (x/2) + 16*cp];
108 }
109 
110 static inline int square(int x)
111 {
112  return x*x;
113 }
114 
115 static inline int eval_sse(uint8_t *a, uint8_t *b, int count)
116 {
117  int diff=0;
118 
119  while(count--)
120  diff += square(*b++ - *a++);
121 
122  return diff;
123 }
124 
125 // FIXME Could use DSPContext.sse, but it is not so speed critical (used
126 // just for motion estimation).
127 static int block_sse(uint8_t **buf1, uint8_t **buf2, int x1, int y1, int x2,
128  int y2, int *stride1, int *stride2, int size)
129 {
130  int i, k;
131  int sse=0;
132 
133  for (k=0; k<3; k++) {
134  int bias = (k ? CHROMA_BIAS : 4);
135  for (i=0; i<size; i++)
136  sse += bias*eval_sse(buf1[k] + (y1+i)*stride1[k] + x1,
137  buf2[k] + (y2+i)*stride2[k] + x2, size);
138  }
139 
140  return sse;
141 }
142 
143 static int eval_motion_dist(RoqContext *enc, int x, int y, motion_vect vect,
144  int size)
145 {
146  int mx=vect.d[0];
147  int my=vect.d[1];
148 
149  if (mx < -7 || mx > 7)
150  return INT_MAX;
151 
152  if (my < -7 || my > 7)
153  return INT_MAX;
154 
155  mx += x;
156  my += y;
157 
158  if ((unsigned) mx > enc->width-size || (unsigned) my > enc->height-size)
159  return INT_MAX;
160 
161  return block_sse(enc->frame_to_enc->data, enc->last_frame->data, x, y,
162  mx, my,
164  size);
165 }
166 
170 static inline int squared_diff_macroblock(uint8_t a[], uint8_t b[], int size)
171 {
172  int cp, sdiff=0;
173 
174  for(cp=0;cp<3;cp++) {
175  int bias = (cp ? CHROMA_BIAS : 4);
176  sdiff += bias*eval_sse(a, b, size*size);
177  a += size*size;
178  b += size*size;
179  }
180 
181  return sdiff;
182 }
183 
184 typedef struct
185 {
186  int eval_dist[4];
189 
190  int subCels[4];
192  int cbEntry;
194 
195 typedef struct
196 {
197  int eval_dist[4];
199 
200  SubcelEvaluation subCels[4];
201 
203  int cbEntry;
204 
205  int sourceX, sourceY;
206 } CelEvaluation;
207 
208 typedef struct
209 {
210  int numCB4;
211  int numCB2;
212  int usedCB2[MAX_CBS_2x2];
213  int usedCB4[MAX_CBS_4x4];
214  uint8_t unpacked_cb2[MAX_CBS_2x2*2*2*3];
215  uint8_t unpacked_cb4[MAX_CBS_4x4*4*4*3];
216  uint8_t unpacked_cb4_enlarged[MAX_CBS_4x4*8*8*3];
217 } RoqCodebooks;
218 
222 typedef struct RoqTempData
223 {
225 
230 
232 
233  int numCB4;
234  int numCB2;
235 
237 
239  int used_option[4];
240 } RoqTempdata;
241 
245 static void create_cel_evals(RoqContext *enc, RoqTempdata *tempData)
246 {
247  int n=0, x, y, i;
248 
249  tempData->cel_evals = av_malloc(enc->width*enc->height/64 * sizeof(CelEvaluation));
250 
251  /* Map to the ROQ quadtree order */
252  for (y=0; y<enc->height; y+=16)
253  for (x=0; x<enc->width; x+=16)
254  for(i=0; i<4; i++) {
255  tempData->cel_evals[n ].sourceX = x + (i&1)*8;
256  tempData->cel_evals[n++].sourceY = y + (i&2)*4;
257  }
258 }
259 
263 static void get_frame_mb(AVFrame *frame, int x, int y, uint8_t mb[], int dim)
264 {
265  int i, j, cp;
266 
267  for (cp=0; cp<3; cp++) {
268  int stride = frame->linesize[cp];
269  for (i=0; i<dim; i++)
270  for (j=0; j<dim; j++)
271  *mb++ = frame->data[cp][(y+i)*stride + x + j];
272  }
273 }
274 
278 static int index_mb(uint8_t cluster[], uint8_t cb[], int numCB,
279  int *outIndex, int dim)
280 {
281  int i, lDiff = INT_MAX, pick=0;
282 
283  /* Diff against the others */
284  for (i=0; i<numCB; i++) {
285  int diff = squared_diff_macroblock(cluster, cb + i*dim*dim*3, dim);
286  if (diff < lDiff) {
287  lDiff = diff;
288  pick = i;
289  }
290  }
291 
292  *outIndex = pick;
293  return lDiff;
294 }
295 
296 #define EVAL_MOTION(MOTION) \
297  do { \
298  diff = eval_motion_dist(enc, j, i, MOTION, blocksize); \
299  \
300  if (diff < lowestdiff) { \
301  lowestdiff = diff; \
302  bestpick = MOTION; \
303  } \
304  } while(0)
305 
306 static void motion_search(RoqContext *enc, int blocksize)
307 {
308  static const motion_vect offsets[8] = {
309  {{ 0,-1}},
310  {{ 0, 1}},
311  {{-1, 0}},
312  {{ 1, 0}},
313  {{-1, 1}},
314  {{ 1,-1}},
315  {{-1,-1}},
316  {{ 1, 1}},
317  };
318 
319  int diff, lowestdiff, oldbest;
320  int off[3];
321  motion_vect bestpick = {{0,0}};
322  int i, j, k, offset;
323 
324  motion_vect *last_motion;
325  motion_vect *this_motion;
326  motion_vect vect, vect2;
327 
328  int max=(enc->width/blocksize)*enc->height/blocksize;
329 
330  if (blocksize == 4) {
331  last_motion = enc->last_motion4;
332  this_motion = enc->this_motion4;
333  } else {
334  last_motion = enc->last_motion8;
335  this_motion = enc->this_motion8;
336  }
337 
338  for (i=0; i<enc->height; i+=blocksize)
339  for (j=0; j<enc->width; j+=blocksize) {
340  lowestdiff = eval_motion_dist(enc, j, i, (motion_vect) {{0,0}},
341  blocksize);
342  bestpick.d[0] = 0;
343  bestpick.d[1] = 0;
344 
345  if (blocksize == 4)
346  EVAL_MOTION(enc->this_motion8[(i/8)*(enc->width/8) + j/8]);
347 
348  offset = (i/blocksize)*enc->width/blocksize + j/blocksize;
349  if (offset < max && offset >= 0)
350  EVAL_MOTION(last_motion[offset]);
351 
352  offset++;
353  if (offset < max && offset >= 0)
354  EVAL_MOTION(last_motion[offset]);
355 
356  offset = (i/blocksize + 1)*enc->width/blocksize + j/blocksize;
357  if (offset < max && offset >= 0)
358  EVAL_MOTION(last_motion[offset]);
359 
360  off[0]= (i/blocksize)*enc->width/blocksize + j/blocksize - 1;
361  off[1]= off[0] - enc->width/blocksize + 1;
362  off[2]= off[1] + 1;
363 
364  if (i) {
365 
366  for(k=0; k<2; k++)
367  vect.d[k]= mid_pred(this_motion[off[0]].d[k],
368  this_motion[off[1]].d[k],
369  this_motion[off[2]].d[k]);
370 
371  EVAL_MOTION(vect);
372  for(k=0; k<3; k++)
373  EVAL_MOTION(this_motion[off[k]]);
374  } else if(j)
375  EVAL_MOTION(this_motion[off[0]]);
376 
377  vect = bestpick;
378 
379  oldbest = -1;
380  while (oldbest != lowestdiff) {
381  oldbest = lowestdiff;
382  for (k=0; k<8; k++) {
383  vect2 = vect;
384  vect2.d[0] += offsets[k].d[0];
385  vect2.d[1] += offsets[k].d[1];
386  EVAL_MOTION(vect2);
387  }
388  vect = bestpick;
389  }
390  offset = (i/blocksize)*enc->width/blocksize + j/blocksize;
391  this_motion[offset] = bestpick;
392  }
393 }
394 
398 static void gather_data_for_subcel(SubcelEvaluation *subcel, int x,
399  int y, RoqContext *enc, RoqTempdata *tempData)
400 {
401  uint8_t mb4[4*4*3];
402  uint8_t mb2[2*2*3];
403  int cluster_index;
404  int i, best_dist;
405 
406  static const int bitsUsed[4] = {2, 10, 10, 34};
407 
408  if (enc->framesSinceKeyframe >= 1) {
409  subcel->motion = enc->this_motion4[y*enc->width/16 + x/4];
410 
411  subcel->eval_dist[RoQ_ID_FCC] =
412  eval_motion_dist(enc, x, y,
413  enc->this_motion4[y*enc->width/16 + x/4], 4);
414  } else
415  subcel->eval_dist[RoQ_ID_FCC] = INT_MAX;
416 
417  if (enc->framesSinceKeyframe >= 2)
419  enc->current_frame->data, x,
420  y, x, y,
421  enc->frame_to_enc->linesize,
422  enc->current_frame->linesize,
423  4);
424  else
425  subcel->eval_dist[RoQ_ID_MOT] = INT_MAX;
426 
427  cluster_index = y*enc->width/16 + x/4;
428 
429  get_frame_mb(enc->frame_to_enc, x, y, mb4, 4);
430 
431  subcel->eval_dist[RoQ_ID_SLD] = index_mb(mb4,
432  tempData->codebooks.unpacked_cb4,
433  tempData->codebooks.numCB4,
434  &subcel->cbEntry, 4);
435 
436  subcel->eval_dist[RoQ_ID_CCC] = 0;
437 
438  for(i=0;i<4;i++) {
439  subcel->subCels[i] = tempData->closest_cb2[cluster_index*4+i];
440 
441  get_frame_mb(enc->frame_to_enc, x+2*(i&1),
442  y+(i&2), mb2, 2);
443 
444  subcel->eval_dist[RoQ_ID_CCC] +=
445  squared_diff_macroblock(tempData->codebooks.unpacked_cb2 + subcel->subCels[i]*2*2*3, mb2, 2);
446  }
447 
448  best_dist = INT_MAX;
449  for (i=0; i<4; i++)
450  if (ROQ_LAMBDA_SCALE*subcel->eval_dist[i] + enc->lambda*bitsUsed[i] <
451  best_dist) {
452  subcel->best_coding = i;
453  subcel->best_bit_use = bitsUsed[i];
454  best_dist = ROQ_LAMBDA_SCALE*subcel->eval_dist[i] +
455  enc->lambda*bitsUsed[i];
456  }
457 }
458 
463  RoqTempdata *tempData)
464 {
465  uint8_t mb8[8*8*3];
466  int index = cel->sourceY*enc->width/64 + cel->sourceX/8;
467  int i, j, best_dist, divide_bit_use;
468 
469  int bitsUsed[4] = {2, 10, 10, 0};
470 
471  if (enc->framesSinceKeyframe >= 1) {
472  cel->motion = enc->this_motion8[index];
473 
474  cel->eval_dist[RoQ_ID_FCC] =
475  eval_motion_dist(enc, cel->sourceX, cel->sourceY,
476  enc->this_motion8[index], 8);
477  } else
478  cel->eval_dist[RoQ_ID_FCC] = INT_MAX;
479 
480  if (enc->framesSinceKeyframe >= 2)
482  enc->current_frame->data,
483  cel->sourceX, cel->sourceY,
484  cel->sourceX, cel->sourceY,
485  enc->frame_to_enc->linesize,
486  enc->current_frame->linesize,8);
487  else
488  cel->eval_dist[RoQ_ID_MOT] = INT_MAX;
489 
490  get_frame_mb(enc->frame_to_enc, cel->sourceX, cel->sourceY, mb8, 8);
491 
492  cel->eval_dist[RoQ_ID_SLD] =
494  tempData->codebooks.numCB4, &cel->cbEntry, 8);
495 
496  gather_data_for_subcel(cel->subCels + 0, cel->sourceX+0, cel->sourceY+0, enc, tempData);
497  gather_data_for_subcel(cel->subCels + 1, cel->sourceX+4, cel->sourceY+0, enc, tempData);
498  gather_data_for_subcel(cel->subCels + 2, cel->sourceX+0, cel->sourceY+4, enc, tempData);
499  gather_data_for_subcel(cel->subCels + 3, cel->sourceX+4, cel->sourceY+4, enc, tempData);
500 
501  cel->eval_dist[RoQ_ID_CCC] = 0;
502  divide_bit_use = 0;
503  for (i=0; i<4; i++) {
504  cel->eval_dist[RoQ_ID_CCC] +=
505  cel->subCels[i].eval_dist[cel->subCels[i].best_coding];
506  divide_bit_use += cel->subCels[i].best_bit_use;
507  }
508 
509  best_dist = INT_MAX;
510  bitsUsed[3] = 2 + divide_bit_use;
511 
512  for (i=0; i<4; i++)
513  if (ROQ_LAMBDA_SCALE*cel->eval_dist[i] + enc->lambda*bitsUsed[i] <
514  best_dist) {
515  cel->best_coding = i;
516  best_dist = ROQ_LAMBDA_SCALE*cel->eval_dist[i] +
517  enc->lambda*bitsUsed[i];
518  }
519 
520  tempData->used_option[cel->best_coding]++;
521  tempData->mainChunkSize += bitsUsed[cel->best_coding];
522 
523  if (cel->best_coding == RoQ_ID_SLD)
524  tempData->codebooks.usedCB4[cel->cbEntry]++;
525 
526  if (cel->best_coding == RoQ_ID_CCC)
527  for (i=0; i<4; i++) {
528  if (cel->subCels[i].best_coding == RoQ_ID_SLD)
529  tempData->codebooks.usedCB4[cel->subCels[i].cbEntry]++;
530  else if (cel->subCels[i].best_coding == RoQ_ID_CCC)
531  for (j=0; j<4; j++)
532  tempData->codebooks.usedCB2[cel->subCels[i].subCels[j]]++;
533  }
534 }
535 
536 static void remap_codebooks(RoqContext *enc, RoqTempdata *tempData)
537 {
538  int i, j, idx=0;
539 
540  /* Make remaps for the final codebook usage */
541  for (i=0; i<MAX_CBS_4x4; i++) {
542  if (tempData->codebooks.usedCB4[i]) {
543  tempData->i2f4[i] = idx;
544  tempData->f2i4[idx] = i;
545  for (j=0; j<4; j++)
546  tempData->codebooks.usedCB2[enc->cb4x4[i].idx[j]]++;
547  idx++;
548  }
549  }
550 
551  tempData->numCB4 = idx;
552 
553  idx = 0;
554  for (i=0; i<MAX_CBS_2x2; i++) {
555  if (tempData->codebooks.usedCB2[i]) {
556  tempData->i2f2[i] = idx;
557  tempData->f2i2[idx] = i;
558  idx++;
559  }
560  }
561  tempData->numCB2 = idx;
562 
563 }
564 
568 static void write_codebooks(RoqContext *enc, RoqTempdata *tempData)
569 {
570  int i, j;
571  uint8_t **outp= &enc->out_buf;
572 
573  if (tempData->numCB2) {
574  bytestream_put_le16(outp, RoQ_QUAD_CODEBOOK);
575  bytestream_put_le32(outp, tempData->numCB2*6 + tempData->numCB4*4);
576  bytestream_put_byte(outp, tempData->numCB4);
577  bytestream_put_byte(outp, tempData->numCB2);
578 
579  for (i=0; i<tempData->numCB2; i++) {
580  bytestream_put_buffer(outp, enc->cb2x2[tempData->f2i2[i]].y, 4);
581  bytestream_put_byte(outp, enc->cb2x2[tempData->f2i2[i]].u);
582  bytestream_put_byte(outp, enc->cb2x2[tempData->f2i2[i]].v);
583  }
584 
585  for (i=0; i<tempData->numCB4; i++)
586  for (j=0; j<4; j++)
587  bytestream_put_byte(outp, tempData->i2f2[enc->cb4x4[tempData->f2i4[i]].idx[j]]);
588 
589  }
590 }
591 
592 static inline uint8_t motion_arg(motion_vect mot)
593 {
594  uint8_t ax = 8 - ((uint8_t) mot.d[0]);
595  uint8_t ay = 8 - ((uint8_t) mot.d[1]);
596  return ((ax&15)<<4) | (ay&15);
597 }
598 
599 typedef struct
600 {
603  uint8_t argumentSpool[64];
604  uint8_t *args;
605  uint8_t **pout;
606 } CodingSpool;
607 
608 /* NOTE: Typecodes must be spooled AFTER arguments!! */
609 static void write_typecode(CodingSpool *s, uint8_t type)
610 {
611  s->typeSpool |= (type & 3) << (14 - s->typeSpoolLength);
612  s->typeSpoolLength += 2;
613  if (s->typeSpoolLength == 16) {
614  bytestream_put_le16(s->pout, s->typeSpool);
616  s->args - s->argumentSpool);
617  s->typeSpoolLength = 0;
618  s->typeSpool = 0;
619  s->args = s->argumentSpool;
620  }
621 }
622 
623 static void reconstruct_and_encode_image(RoqContext *enc, RoqTempdata *tempData, int w, int h, int numBlocks)
624 {
625  int i, j, k;
626  int x, y;
627  int subX, subY;
628  int dist=0;
629 
630  roq_qcell *qcell;
631  CelEvaluation *eval;
632 
633  CodingSpool spool;
634 
635  spool.typeSpool=0;
636  spool.typeSpoolLength=0;
637  spool.args = spool.argumentSpool;
638  spool.pout = &enc->out_buf;
639 
640  if (tempData->used_option[RoQ_ID_CCC]%2)
641  tempData->mainChunkSize+=8; //FIXME
642 
643  /* Write the video chunk header */
644  bytestream_put_le16(&enc->out_buf, RoQ_QUAD_VQ);
645  bytestream_put_le32(&enc->out_buf, tempData->mainChunkSize/8);
646  bytestream_put_byte(&enc->out_buf, 0x0);
647  bytestream_put_byte(&enc->out_buf, 0x0);
648 
649  for (i=0; i<numBlocks; i++) {
650  eval = tempData->cel_evals + i;
651 
652  x = eval->sourceX;
653  y = eval->sourceY;
654  dist += eval->eval_dist[eval->best_coding];
655 
656  switch (eval->best_coding) {
657  case RoQ_ID_MOT:
658  write_typecode(&spool, RoQ_ID_MOT);
659  break;
660 
661  case RoQ_ID_FCC:
662  bytestream_put_byte(&spool.args, motion_arg(eval->motion));
663 
664  write_typecode(&spool, RoQ_ID_FCC);
665  ff_apply_motion_8x8(enc, x, y,
666  eval->motion.d[0], eval->motion.d[1]);
667  break;
668 
669  case RoQ_ID_SLD:
670  bytestream_put_byte(&spool.args, tempData->i2f4[eval->cbEntry]);
671  write_typecode(&spool, RoQ_ID_SLD);
672 
673  qcell = enc->cb4x4 + eval->cbEntry;
674  ff_apply_vector_4x4(enc, x , y , enc->cb2x2 + qcell->idx[0]);
675  ff_apply_vector_4x4(enc, x+4, y , enc->cb2x2 + qcell->idx[1]);
676  ff_apply_vector_4x4(enc, x , y+4, enc->cb2x2 + qcell->idx[2]);
677  ff_apply_vector_4x4(enc, x+4, y+4, enc->cb2x2 + qcell->idx[3]);
678  break;
679 
680  case RoQ_ID_CCC:
681  write_typecode(&spool, RoQ_ID_CCC);
682 
683  for (j=0; j<4; j++) {
684  subX = x + 4*(j&1);
685  subY = y + 2*(j&2);
686 
687  switch(eval->subCels[j].best_coding) {
688  case RoQ_ID_MOT:
689  break;
690 
691  case RoQ_ID_FCC:
692  bytestream_put_byte(&spool.args,
693  motion_arg(eval->subCels[j].motion));
694 
695  ff_apply_motion_4x4(enc, subX, subY,
696  eval->subCels[j].motion.d[0],
697  eval->subCels[j].motion.d[1]);
698  break;
699 
700  case RoQ_ID_SLD:
701  bytestream_put_byte(&spool.args,
702  tempData->i2f4[eval->subCels[j].cbEntry]);
703 
704  qcell = enc->cb4x4 + eval->subCels[j].cbEntry;
705 
706  ff_apply_vector_2x2(enc, subX , subY ,
707  enc->cb2x2 + qcell->idx[0]);
708  ff_apply_vector_2x2(enc, subX+2, subY ,
709  enc->cb2x2 + qcell->idx[1]);
710  ff_apply_vector_2x2(enc, subX , subY+2,
711  enc->cb2x2 + qcell->idx[2]);
712  ff_apply_vector_2x2(enc, subX+2, subY+2,
713  enc->cb2x2 + qcell->idx[3]);
714  break;
715 
716  case RoQ_ID_CCC:
717  for (k=0; k<4; k++) {
718  int cb_idx = eval->subCels[j].subCels[k];
719  bytestream_put_byte(&spool.args,
720  tempData->i2f2[cb_idx]);
721 
722  ff_apply_vector_2x2(enc, subX + 2*(k&1), subY + (k&2),
723  enc->cb2x2 + cb_idx);
724  }
725  break;
726  }
727  write_typecode(&spool, eval->subCels[j].best_coding);
728  }
729  break;
730  }
731  }
732 
733  /* Flush the remainder of the argument/type spool */
734  while (spool.typeSpoolLength)
735  write_typecode(&spool, 0x0);
736 
737 #if 0
738  uint8_t *fdata[3] = {enc->frame_to_enc->data[0],
739  enc->frame_to_enc->data[1],
740  enc->frame_to_enc->data[2]};
741  uint8_t *cdata[3] = {enc->current_frame->data[0],
742  enc->current_frame->data[1],
743  enc->current_frame->data[2]};
744  av_log(enc->avctx, AV_LOG_ERROR, "Expected distortion: %i Actual: %i\n",
745  dist,
746  block_sse(fdata, cdata, 0, 0, 0, 0,
747  enc->frame_to_enc->linesize,
748  enc->current_frame->linesize,
749  enc->width)); //WARNING: Square dimensions implied...
750 #endif
751 }
752 
753 
757 static inline void frame_block_to_cell(uint8_t *block, uint8_t **data,
758  int top, int left, int *stride)
759 {
760  int i, j, u=0, v=0;
761 
762  for (i=0; i<2; i++)
763  for (j=0; j<2; j++) {
764  int x = (top+i)*stride[0] + left + j;
765  *block++ = data[0][x];
766  x = (top+i)*stride[1] + left + j;
767  u += data[1][x];
768  v += data[2][x];
769  }
770 
771  *block++ = (u+2)/4;
772  *block++ = (v+2)/4;
773 }
774 
778 static void create_clusters(AVFrame *frame, int w, int h, uint8_t *yuvClusters)
779 {
780  int i, j, k, l;
781 
782  for (i=0; i<h; i+=4)
783  for (j=0; j<w; j+=4) {
784  for (k=0; k < 2; k++)
785  for (l=0; l < 2; l++)
786  frame_block_to_cell(yuvClusters + (l + 2*k)*6, frame->data,
787  i+2*k, j+2*l, frame->linesize);
788  yuvClusters += 24;
789  }
790 }
791 
792 static void generate_codebook(RoqContext *enc, RoqTempdata *tempdata,
793  int *points, int inputCount, roq_cell *results,
794  int size, int cbsize)
795 {
796  int i, j, k;
797  int c_size = size*size/4;
798  int *buf;
799  int *codebook = av_malloc(6*c_size*cbsize*sizeof(int));
800  int *closest_cb;
801 
802  if (size == 4)
803  closest_cb = av_malloc(6*c_size*inputCount*sizeof(int));
804  else
805  closest_cb = tempdata->closest_cb2;
806 
807  ff_init_elbg(points, 6*c_size, inputCount, codebook, cbsize, 1, closest_cb, &enc->randctx);
808  ff_do_elbg(points, 6*c_size, inputCount, codebook, cbsize, 1, closest_cb, &enc->randctx);
809 
810  if (size == 4)
811  av_free(closest_cb);
812 
813  buf = codebook;
814  for (i=0; i<cbsize; i++)
815  for (k=0; k<c_size; k++) {
816  for(j=0; j<4; j++)
817  results->y[j] = *buf++;
818 
819  results->u = (*buf++ + CHROMA_BIAS/2)/CHROMA_BIAS;
820  results->v = (*buf++ + CHROMA_BIAS/2)/CHROMA_BIAS;
821  results++;
822  }
823 
824  av_free(codebook);
825 }
826 
827 static void generate_new_codebooks(RoqContext *enc, RoqTempdata *tempData)
828 {
829  int i,j;
830  RoqCodebooks *codebooks = &tempData->codebooks;
831  int max = enc->width*enc->height/16;
832  uint8_t mb2[3*4];
833  roq_cell *results4 = av_malloc(sizeof(roq_cell)*MAX_CBS_4x4*4);
834  uint8_t *yuvClusters=av_malloc(sizeof(int)*max*6*4);
835  int *points = av_malloc(max*6*4*sizeof(int));
836  int bias;
837 
838  /* Subsample YUV data */
839  create_clusters(enc->frame_to_enc, enc->width, enc->height, yuvClusters);
840 
841  /* Cast to integer and apply chroma bias */
842  for (i=0; i<max*24; i++) {
843  bias = ((i%6)<4) ? 1 : CHROMA_BIAS;
844  points[i] = bias*yuvClusters[i];
845  }
846 
847  /* Create 4x4 codebooks */
848  generate_codebook(enc, tempData, points, max, results4, 4, MAX_CBS_4x4);
849 
850  codebooks->numCB4 = MAX_CBS_4x4;
851 
852  tempData->closest_cb2 = av_malloc(max*4*sizeof(int));
853 
854  /* Create 2x2 codebooks */
855  generate_codebook(enc, tempData, points, max*4, enc->cb2x2, 2, MAX_CBS_2x2);
856 
857  codebooks->numCB2 = MAX_CBS_2x2;
858 
859  /* Unpack 2x2 codebook clusters */
860  for (i=0; i<codebooks->numCB2; i++)
861  unpack_roq_cell(enc->cb2x2 + i, codebooks->unpacked_cb2 + i*2*2*3);
862 
863  /* Index all 4x4 entries to the 2x2 entries, unpack, and enlarge */
864  for (i=0; i<codebooks->numCB4; i++) {
865  for (j=0; j<4; j++) {
866  unpack_roq_cell(&results4[4*i + j], mb2);
867  index_mb(mb2, codebooks->unpacked_cb2, codebooks->numCB2,
868  &enc->cb4x4[i].idx[j], 2);
869  }
870  unpack_roq_qcell(codebooks->unpacked_cb2, enc->cb4x4 + i,
871  codebooks->unpacked_cb4 + i*4*4*3);
872  enlarge_roq_mb4(codebooks->unpacked_cb4 + i*4*4*3,
873  codebooks->unpacked_cb4_enlarged + i*8*8*3);
874  }
875 
876  av_free(yuvClusters);
877  av_free(points);
878  av_free(results4);
879 }
880 
881 static void roq_encode_video(RoqContext *enc)
882 {
883  RoqTempdata *tempData = enc->tmpData;
884  int i;
885 
886  memset(tempData, 0, sizeof(*tempData));
887 
888  create_cel_evals(enc, tempData);
889 
890  generate_new_codebooks(enc, tempData);
891 
892  if (enc->framesSinceKeyframe >= 1) {
893  motion_search(enc, 8);
894  motion_search(enc, 4);
895  }
896 
897  retry_encode:
898  for (i=0; i<enc->width*enc->height/64; i++)
899  gather_data_for_cel(tempData->cel_evals + i, enc, tempData);
900 
901  /* Quake 3 can't handle chunks bigger than 65535 bytes */
902  if (tempData->mainChunkSize/8 > 65535) {
903  av_log(enc->avctx, AV_LOG_ERROR,
904  "Warning, generated a frame too big (%d > 65535), "
905  "try using a smaller qscale value.\n",
906  tempData->mainChunkSize/8);
907  enc->lambda *= 1.5;
908  tempData->mainChunkSize = 0;
909  memset(tempData->used_option, 0, sizeof(tempData->used_option));
910  memset(tempData->codebooks.usedCB4, 0,
911  sizeof(tempData->codebooks.usedCB4));
912  memset(tempData->codebooks.usedCB2, 0,
913  sizeof(tempData->codebooks.usedCB2));
914 
915  goto retry_encode;
916  }
917 
918  remap_codebooks(enc, tempData);
919 
920  write_codebooks(enc, tempData);
921 
922  reconstruct_and_encode_image(enc, tempData, enc->width, enc->height,
923  enc->width*enc->height/64);
924 
925  enc->avctx->coded_frame = enc->current_frame;
926 
927  /* Rotate frame history */
928  FFSWAP(AVFrame *, enc->current_frame, enc->last_frame);
931 
932  av_free(tempData->cel_evals);
933  av_free(tempData->closest_cb2);
934 
935  enc->framesSinceKeyframe++;
936 }
937 
938 static int roq_encode_init(AVCodecContext *avctx)
939 {
940  RoqContext *enc = avctx->priv_data;
941 
942  av_lfg_init(&enc->randctx, 1);
943 
944  enc->framesSinceKeyframe = 0;
945  if ((avctx->width & 0xf) || (avctx->height & 0xf)) {
946  av_log(avctx, AV_LOG_ERROR, "Dimensions must be divisible by 16\n");
947  return -1;
948  }
949 
950  if (((avctx->width)&(avctx->width-1))||((avctx->height)&(avctx->height-1)))
951  av_log(avctx, AV_LOG_ERROR, "Warning: dimensions not power of two\n");
952 
953  enc->width = avctx->width;
954  enc->height = avctx->height;
955 
956  enc->framesSinceKeyframe = 0;
957  enc->first_frame = 1;
958 
959  enc->last_frame = &enc->frames[0];
960  enc->current_frame = &enc->frames[1];
961 
962  enc->tmpData = av_malloc(sizeof(RoqTempdata));
963 
964  enc->this_motion4 =
965  av_mallocz((enc->width*enc->height/16)*sizeof(motion_vect));
966 
967  enc->last_motion4 =
968  av_malloc ((enc->width*enc->height/16)*sizeof(motion_vect));
969 
970  enc->this_motion8 =
971  av_mallocz((enc->width*enc->height/64)*sizeof(motion_vect));
972 
973  enc->last_motion8 =
974  av_malloc ((enc->width*enc->height/64)*sizeof(motion_vect));
975 
976  return 0;
977 }
978 
980 {
981  /* ROQ info chunk */
982  bytestream_put_le16(&enc->out_buf, RoQ_INFO);
983 
984  /* Size: 8 bytes */
985  bytestream_put_le32(&enc->out_buf, 8);
986 
987  /* Unused argument */
988  bytestream_put_byte(&enc->out_buf, 0x00);
989  bytestream_put_byte(&enc->out_buf, 0x00);
990 
991  /* Width */
992  bytestream_put_le16(&enc->out_buf, enc->width);
993 
994  /* Height */
995  bytestream_put_le16(&enc->out_buf, enc->height);
996 
997  /* Unused in Quake 3, mimics the output of the real encoder */
998  bytestream_put_byte(&enc->out_buf, 0x08);
999  bytestream_put_byte(&enc->out_buf, 0x00);
1000  bytestream_put_byte(&enc->out_buf, 0x04);
1001  bytestream_put_byte(&enc->out_buf, 0x00);
1002 }
1003 
1004 static int roq_encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data)
1005 {
1006  RoqContext *enc = avctx->priv_data;
1007  AVFrame *frame= data;
1008  uint8_t *buf_start = buf;
1009 
1010  enc->out_buf = buf;
1011  enc->avctx = avctx;
1012 
1013  enc->frame_to_enc = frame;
1014 
1015  if (frame->quality)
1016  enc->lambda = frame->quality - 1;
1017  else
1018  enc->lambda = 2*ROQ_LAMBDA_SCALE;
1019 
1020  /* 138 bits max per 8x8 block +
1021  * 256 codebooks*(6 bytes 2x2 + 4 bytes 4x4) + 8 bytes frame header */
1022  if (((enc->width*enc->height/64)*138+7)/8 + 256*(6+4) + 8 > buf_size) {
1023  av_log(avctx, AV_LOG_ERROR, " RoQ: Output buffer too small!\n");
1024  return -1;
1025  }
1026 
1027  /* Check for I frame */
1028  if (enc->framesSinceKeyframe == avctx->gop_size)
1029  enc->framesSinceKeyframe = 0;
1030 
1031  if (enc->first_frame) {
1032  /* Alloc memory for the reconstruction data (we must know the stride
1033  for that) */
1034  if (avctx->get_buffer(avctx, enc->current_frame) ||
1035  avctx->get_buffer(avctx, enc->last_frame)) {
1036  av_log(avctx, AV_LOG_ERROR, " RoQ: get_buffer() failed\n");
1037  return -1;
1038  }
1039 
1040  /* Before the first video frame, write a "video info" chunk */
1042 
1043  enc->first_frame = 0;
1044  }
1045 
1046  /* Encode the actual frame */
1047  roq_encode_video(enc);
1048 
1049  return enc->out_buf - buf_start;
1050 }
1051 
1052 static int roq_encode_end(AVCodecContext *avctx)
1053 {
1054  RoqContext *enc = avctx->priv_data;
1055 
1056  avctx->release_buffer(avctx, enc->last_frame);
1057  avctx->release_buffer(avctx, enc->current_frame);
1058 
1059  av_free(enc->tmpData);
1060  av_free(enc->this_motion4);
1061  av_free(enc->last_motion4);
1062  av_free(enc->this_motion8);
1063  av_free(enc->last_motion8);
1064 
1065  return 0;
1066 }
1067 
1069  .name = "roqvideo",
1070  .type = AVMEDIA_TYPE_VIDEO,
1071  .id = CODEC_ID_ROQ,
1072  .priv_data_size = sizeof(RoqContext),
1073  .init = roq_encode_init,
1074  .encode = roq_encode_frame,
1075  .close = roq_encode_end,
1076  .supported_framerates = (const AVRational[]){{30,1}, {0,0}},
1077  .pix_fmts = (const enum PixelFormat[]){PIX_FMT_YUV444P, PIX_FMT_NONE},
1078  .long_name = NULL_IF_CONFIG_SMALL("id RoQ video"),
1079 };