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svq1enc.c
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1 /*
2  * SVQ1 Encoder
3  * Copyright (C) 2004 Mike Melanson <melanson@pcisys.net>
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 /**
23  * @file
24  * Sorenson Vector Quantizer #1 (SVQ1) video codec.
25  * For more information of the SVQ1 algorithm, visit:
26  * http://www.pcisys.net/~melanson/codecs/
27  */
28 
29 #include "avcodec.h"
30 #include "mpegvideo.h"
31 #include "h263.h"
32 #include "internal.h"
33 #include "libavutil/avassert.h"
34 #include "svq1.h"
35 #include "svq1enc_cb.h"
36 
37 
38 typedef struct SVQ1Context {
39  /* FIXME: Needed for motion estimation, should not be used for anything
40  * else, the idea is to make the motion estimation eventually independent
41  * of MpegEncContext, so this will be removed then. */
50 
51  /* why ooh why this sick breadth first order,
52  * everything is slower and more complex */
54 
57 
58  /* Y plane block dimensions */
61 
62  /* U & V plane (C planes) block dimensions */
65 
66  uint16_t *mb_type;
67  uint32_t *dummy;
68  int16_t (*motion_val8[3])[2];
69  int16_t (*motion_val16[3])[2];
70 
71  int64_t rd_total;
72 
74 } SVQ1Context;
75 
76 static void svq1_write_header(SVQ1Context *s, int frame_type)
77 {
78  int i;
79 
80  /* frame code */
81  put_bits(&s->pb, 22, 0x20);
82 
83  /* temporal reference (sure hope this is a "don't care") */
84  put_bits(&s->pb, 8, 0x00);
85 
86  /* frame type */
87  put_bits(&s->pb, 2, frame_type - 1);
88 
89  if (frame_type == AV_PICTURE_TYPE_I) {
90  /* no checksum since frame code is 0x20 */
91  /* no embedded string either */
92  /* output 5 unknown bits (2 + 2 + 1) */
93  put_bits(&s->pb, 5, 2); /* 2 needed by quicktime decoder */
94 
97  s->frame_width, s->frame_height);
98  put_bits(&s->pb, 3, i);
99 
100  if (i == 7) {
101  put_bits(&s->pb, 12, s->frame_width);
102  put_bits(&s->pb, 12, s->frame_height);
103  }
104  }
105 
106  /* no checksum or extra data (next 2 bits get 0) */
107  put_bits(&s->pb, 2, 0);
108 }
109 
110 #define QUALITY_THRESHOLD 100
111 #define THRESHOLD_MULTIPLIER 0.6
112 
113 static int encode_block(SVQ1Context *s, uint8_t *src, uint8_t *ref,
114  uint8_t *decoded, int stride, int level,
115  int threshold, int lambda, int intra)
116 {
117  int count, y, x, i, j, split, best_mean, best_score, best_count;
118  int best_vector[6];
119  int block_sum[7] = { 0, 0, 0, 0, 0, 0 };
120  int w = 2 << (level + 2 >> 1);
121  int h = 2 << (level + 1 >> 1);
122  int size = w * h;
123  int16_t block[7][256];
124  const int8_t *codebook_sum, *codebook;
125  const uint16_t(*mean_vlc)[2];
126  const uint8_t(*multistage_vlc)[2];
127 
128  best_score = 0;
129  // FIXME: Optimize, this does not need to be done multiple times.
130  if (intra) {
131  codebook_sum = svq1_intra_codebook_sum[level];
132  codebook = ff_svq1_intra_codebooks[level];
133  mean_vlc = ff_svq1_intra_mean_vlc;
134  multistage_vlc = ff_svq1_intra_multistage_vlc[level];
135  for (y = 0; y < h; y++) {
136  for (x = 0; x < w; x++) {
137  int v = src[x + y * stride];
138  block[0][x + w * y] = v;
139  best_score += v * v;
140  block_sum[0] += v;
141  }
142  }
143  } else {
144  codebook_sum = svq1_inter_codebook_sum[level];
145  codebook = ff_svq1_inter_codebooks[level];
146  mean_vlc = ff_svq1_inter_mean_vlc + 256;
147  multistage_vlc = ff_svq1_inter_multistage_vlc[level];
148  for (y = 0; y < h; y++) {
149  for (x = 0; x < w; x++) {
150  int v = src[x + y * stride] - ref[x + y * stride];
151  block[0][x + w * y] = v;
152  best_score += v * v;
153  block_sum[0] += v;
154  }
155  }
156  }
157 
158  best_count = 0;
159  best_score -= (int)((unsigned)block_sum[0] * block_sum[0] >> (level + 3));
160  best_mean = block_sum[0] + (size >> 1) >> (level + 3);
161 
162  if (level < 4) {
163  for (count = 1; count < 7; count++) {
164  int best_vector_score = INT_MAX;
165  int best_vector_sum = -999, best_vector_mean = -999;
166  const int stage = count - 1;
167  const int8_t *vector;
168 
169  for (i = 0; i < 16; i++) {
170  int sum = codebook_sum[stage * 16 + i];
171  int sqr, diff, score;
172 
173  vector = codebook + stage * size * 16 + i * size;
174  sqr = s->dsp.ssd_int8_vs_int16(vector, block[stage], size);
175  diff = block_sum[stage] - sum;
176  score = sqr - (diff * (int64_t)diff >> (level + 3)); // FIXME: 64bit slooow
177  if (score < best_vector_score) {
178  int mean = diff + (size >> 1) >> (level + 3);
179  av_assert2(mean > -300 && mean < 300);
180  mean = av_clip(mean, intra ? 0 : -256, 255);
181  best_vector_score = score;
182  best_vector[stage] = i;
183  best_vector_sum = sum;
184  best_vector_mean = mean;
185  }
186  }
187  av_assert0(best_vector_mean != -999);
188  vector = codebook + stage * size * 16 + best_vector[stage] * size;
189  for (j = 0; j < size; j++)
190  block[stage + 1][j] = block[stage][j] - vector[j];
191  block_sum[stage + 1] = block_sum[stage] - best_vector_sum;
192  best_vector_score += lambda *
193  (+1 + 4 * count +
194  multistage_vlc[1 + count][1]
195  + mean_vlc[best_vector_mean][1]);
196 
197  if (best_vector_score < best_score) {
198  best_score = best_vector_score;
199  best_count = count;
200  best_mean = best_vector_mean;
201  }
202  }
203  }
204 
205  split = 0;
206  if (best_score > threshold && level) {
207  int score = 0;
208  int offset = level & 1 ? stride * h / 2 : w / 2;
209  PutBitContext backup[6];
210 
211  for (i = level - 1; i >= 0; i--)
212  backup[i] = s->reorder_pb[i];
213  score += encode_block(s, src, ref, decoded, stride, level - 1,
214  threshold >> 1, lambda, intra);
215  score += encode_block(s, src + offset, ref + offset, decoded + offset,
216  stride, level - 1, threshold >> 1, lambda, intra);
217  score += lambda;
218 
219  if (score < best_score) {
220  best_score = score;
221  split = 1;
222  } else {
223  for (i = level - 1; i >= 0; i--)
224  s->reorder_pb[i] = backup[i];
225  }
226  }
227  if (level > 0)
228  put_bits(&s->reorder_pb[level], 1, split);
229 
230  if (!split) {
231  av_assert1(best_mean >= 0 && best_mean < 256 || !intra);
232  av_assert1(best_mean >= -256 && best_mean < 256);
233  av_assert1(best_count >= 0 && best_count < 7);
234  av_assert1(level < 4 || best_count == 0);
235 
236  /* output the encoding */
237  put_bits(&s->reorder_pb[level],
238  multistage_vlc[1 + best_count][1],
239  multistage_vlc[1 + best_count][0]);
240  put_bits(&s->reorder_pb[level], mean_vlc[best_mean][1],
241  mean_vlc[best_mean][0]);
242 
243  for (i = 0; i < best_count; i++) {
244  av_assert2(best_vector[i] >= 0 && best_vector[i] < 16);
245  put_bits(&s->reorder_pb[level], 4, best_vector[i]);
246  }
247 
248  for (y = 0; y < h; y++)
249  for (x = 0; x < w; x++)
250  decoded[x + y * stride] = src[x + y * stride] -
251  block[best_count][x + w * y] +
252  best_mean;
253  }
254 
255  return best_score;
256 }
257 
258 static int svq1_encode_plane(SVQ1Context *s, int plane,
259  unsigned char *src_plane,
260  unsigned char *ref_plane,
261  unsigned char *decoded_plane,
262  int width, int height, int src_stride, int stride)
263 {
264  int x, y;
265  int i;
266  int block_width, block_height;
267  int level;
268  int threshold[6];
269  uint8_t *src = s->scratchbuf + stride * 16;
270  const int lambda = (s->picture.quality * s->picture.quality) >>
271  (2 * FF_LAMBDA_SHIFT);
272 
273  /* figure out the acceptable level thresholds in advance */
274  threshold[5] = QUALITY_THRESHOLD;
275  for (level = 4; level >= 0; level--)
276  threshold[level] = threshold[level + 1] * THRESHOLD_MULTIPLIER;
277 
278  block_width = (width + 15) / 16;
279  block_height = (height + 15) / 16;
280 
281  if (s->picture.pict_type == AV_PICTURE_TYPE_P) {
282  s->m.avctx = s->avctx;
284  s->m.last_picture_ptr = &s->m.last_picture;
285  s->m.last_picture.f.data[0] = ref_plane;
286  s->m.linesize =
287  s->m.last_picture.f.linesize[0] =
288  s->m.new_picture.f.linesize[0] =
290  s->m.width = width;
291  s->m.height = height;
292  s->m.mb_width = block_width;
293  s->m.mb_height = block_height;
294  s->m.mb_stride = s->m.mb_width + 1;
295  s->m.b8_stride = 2 * s->m.mb_width + 1;
296  s->m.f_code = 1;
297  s->m.pict_type = s->picture.pict_type;
298  s->m.me_method = s->avctx->me_method;
299  s->m.me.scene_change_score = 0;
300  s->m.flags = s->avctx->flags;
301  // s->m.out_format = FMT_H263;
302  // s->m.unrestricted_mv = 1;
303  s->m.lambda = s->picture.quality;
304  s->m.qscale = s->m.lambda * 139 +
305  FF_LAMBDA_SCALE * 64 >>
306  FF_LAMBDA_SHIFT + 7;
307  s->m.lambda2 = s->m.lambda * s->m.lambda +
308  FF_LAMBDA_SCALE / 2 >>
310 
311  if (!s->motion_val8[plane]) {
312  s->motion_val8[plane] = av_mallocz((s->m.b8_stride *
313  block_height * 2 + 2) *
314  2 * sizeof(int16_t));
315  s->motion_val16[plane] = av_mallocz((s->m.mb_stride *
316  (block_height + 2) + 1) *
317  2 * sizeof(int16_t));
318  }
319 
320  s->m.mb_type = s->mb_type;
321 
322  // dummies, to avoid segfaults
324  s->m.current_picture.mb_var = (uint16_t *)s->dummy;
325  s->m.current_picture.mc_mb_var = (uint16_t *)s->dummy;
326  s->m.current_picture.f.mb_type = s->dummy;
327 
328  s->m.current_picture.f.motion_val[0] = s->motion_val8[plane] + 2;
329  s->m.p_mv_table = s->motion_val16[plane] +
330  s->m.mb_stride + 1;
331  s->m.dsp = s->dsp; // move
332  ff_init_me(&s->m);
333 
334  s->m.me.dia_size = s->avctx->dia_size;
335  s->m.first_slice_line = 1;
336  for (y = 0; y < block_height; y++) {
337  s->m.new_picture.f.data[0] = src - y * 16 * stride; // ugly
338  s->m.mb_y = y;
339 
340  for (i = 0; i < 16 && i + 16 * y < height; i++) {
341  memcpy(&src[i * stride], &src_plane[(i + 16 * y) * src_stride],
342  width);
343  for (x = width; x < 16 * block_width; x++)
344  src[i * stride + x] = src[i * stride + x - 1];
345  }
346  for (; i < 16 && i + 16 * y < 16 * block_height; i++)
347  memcpy(&src[i * stride], &src[(i - 1) * stride],
348  16 * block_width);
349 
350  for (x = 0; x < block_width; x++) {
351  s->m.mb_x = x;
352  ff_init_block_index(&s->m);
354 
355  ff_estimate_p_frame_motion(&s->m, x, y);
356  }
357  s->m.first_slice_line = 0;
358  }
359 
360  ff_fix_long_p_mvs(&s->m);
361  ff_fix_long_mvs(&s->m, NULL, 0, s->m.p_mv_table, s->m.f_code,
363  }
364 
365  s->m.first_slice_line = 1;
366  for (y = 0; y < block_height; y++) {
367  for (i = 0; i < 16 && i + 16 * y < height; i++) {
368  memcpy(&src[i * stride], &src_plane[(i + 16 * y) * src_stride],
369  width);
370  for (x = width; x < 16 * block_width; x++)
371  src[i * stride + x] = src[i * stride + x - 1];
372  }
373  for (; i < 16 && i + 16 * y < 16 * block_height; i++)
374  memcpy(&src[i * stride], &src[(i - 1) * stride], 16 * block_width);
375 
376  s->m.mb_y = y;
377  for (x = 0; x < block_width; x++) {
378  uint8_t reorder_buffer[3][6][7 * 32];
379  int count[3][6];
380  int offset = y * 16 * stride + x * 16;
381  uint8_t *decoded = decoded_plane + offset;
382  uint8_t *ref = ref_plane + offset;
383  int score[4] = { 0, 0, 0, 0 }, best;
384  uint8_t *temp = s->scratchbuf;
385 
386  if (s->pb.buf_end - s->pb.buf -
387  (put_bits_count(&s->pb) >> 3) < 3000) { // FIXME: check size
388  av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
389  return -1;
390  }
391 
392  s->m.mb_x = x;
393  ff_init_block_index(&s->m);
395 
396  if (s->picture.pict_type == AV_PICTURE_TYPE_I ||
397  (s->m.mb_type[x + y * s->m.mb_stride] &
399  for (i = 0; i < 6; i++)
400  init_put_bits(&s->reorder_pb[i], reorder_buffer[0][i],
401  7 * 32);
402  if (s->picture.pict_type == AV_PICTURE_TYPE_P) {
404  put_bits(&s->reorder_pb[5], vlc[1], vlc[0]);
405  score[0] = vlc[1] * lambda;
406  }
407  score[0] += encode_block(s, src + 16 * x, NULL, temp, stride,
408  5, 64, lambda, 1);
409  for (i = 0; i < 6; i++) {
410  count[0][i] = put_bits_count(&s->reorder_pb[i]);
411  flush_put_bits(&s->reorder_pb[i]);
412  }
413  } else
414  score[0] = INT_MAX;
415 
416  best = 0;
417 
418  if (s->picture.pict_type == AV_PICTURE_TYPE_P) {
420  int mx, my, pred_x, pred_y, dxy;
421  int16_t *motion_ptr;
422 
423  motion_ptr = ff_h263_pred_motion(&s->m, 0, 0, &pred_x, &pred_y);
424  if (s->m.mb_type[x + y * s->m.mb_stride] &
426  for (i = 0; i < 6; i++)
427  init_put_bits(&s->reorder_pb[i], reorder_buffer[1][i],
428  7 * 32);
429 
430  put_bits(&s->reorder_pb[5], vlc[1], vlc[0]);
431 
432  s->m.pb = s->reorder_pb[5];
433  mx = motion_ptr[0];
434  my = motion_ptr[1];
435  av_assert1(mx >= -32 && mx <= 31);
436  av_assert1(my >= -32 && my <= 31);
437  av_assert1(pred_x >= -32 && pred_x <= 31);
438  av_assert1(pred_y >= -32 && pred_y <= 31);
439  ff_h263_encode_motion(&s->m, mx - pred_x, 1);
440  ff_h263_encode_motion(&s->m, my - pred_y, 1);
441  s->reorder_pb[5] = s->m.pb;
442  score[1] += lambda * put_bits_count(&s->reorder_pb[5]);
443 
444  dxy = (mx & 1) + 2 * (my & 1);
445 
446  s->dsp.put_pixels_tab[0][dxy](temp + 16,
447  ref + (mx >> 1) +
448  stride * (my >> 1),
449  stride, 16);
450 
451  score[1] += encode_block(s, src + 16 * x, temp + 16,
452  decoded, stride, 5, 64, lambda, 0);
453  best = score[1] <= score[0];
454 
456  score[2] = s->dsp.sse[0](NULL, src + 16 * x, ref,
457  stride, 16);
458  score[2] += vlc[1] * lambda;
459  if (score[2] < score[best] && mx == 0 && my == 0) {
460  best = 2;
461  s->dsp.put_pixels_tab[0][0](decoded, ref, stride, 16);
462  for (i = 0; i < 6; i++)
463  count[2][i] = 0;
464  put_bits(&s->pb, vlc[1], vlc[0]);
465  }
466  }
467 
468  if (best == 1) {
469  for (i = 0; i < 6; i++) {
470  count[1][i] = put_bits_count(&s->reorder_pb[i]);
471  flush_put_bits(&s->reorder_pb[i]);
472  }
473  } else {
474  motion_ptr[0] =
475  motion_ptr[1] =
476  motion_ptr[2] =
477  motion_ptr[3] =
478  motion_ptr[0 + 2 * s->m.b8_stride] =
479  motion_ptr[1 + 2 * s->m.b8_stride] =
480  motion_ptr[2 + 2 * s->m.b8_stride] =
481  motion_ptr[3 + 2 * s->m.b8_stride] = 0;
482  }
483  }
484 
485  s->rd_total += score[best];
486 
487  for (i = 5; i >= 0; i--)
488  avpriv_copy_bits(&s->pb, reorder_buffer[best][i],
489  count[best][i]);
490  if (best == 0)
491  s->dsp.put_pixels_tab[0][0](decoded, temp, stride, 16);
492  }
493  s->m.first_slice_line = 0;
494  }
495  return 0;
496 }
497 
499 {
500  SVQ1Context *const s = avctx->priv_data;
501 
502  ff_dsputil_init(&s->dsp, avctx);
503  avctx->coded_frame = &s->picture;
504 
505  s->frame_width = avctx->width;
506  s->frame_height = avctx->height;
507 
508  s->y_block_width = (s->frame_width + 15) / 16;
509  s->y_block_height = (s->frame_height + 15) / 16;
510 
511  s->c_block_width = (s->frame_width / 4 + 15) / 16;
512  s->c_block_height = (s->frame_height / 4 + 15) / 16;
513 
514  s->avctx = avctx;
515  s->m.avctx = avctx;
517  s->m.me.temp =
518  s->m.me.scratchpad = av_mallocz((avctx->width + 64) *
519  2 * 16 * 2 * sizeof(uint8_t));
520  s->m.me.map = av_mallocz(ME_MAP_SIZE * sizeof(uint32_t));
521  s->m.me.score_map = av_mallocz(ME_MAP_SIZE * sizeof(uint32_t));
522  s->mb_type = av_mallocz((s->y_block_width + 1) *
523  s->y_block_height * sizeof(int16_t));
524  s->dummy = av_mallocz((s->y_block_width + 1) *
525  s->y_block_height * sizeof(int32_t));
526  ff_h263_encode_init(&s->m); // mv_penalty
527 
528  return 0;
529 }
530 
532  const AVFrame *pict, int *got_packet)
533 {
534  SVQ1Context *const s = avctx->priv_data;
535  AVFrame *const p = &s->picture;
536  AVFrame temp;
537  int i, ret;
538 
539  if ((ret = ff_alloc_packet2(avctx, pkt, s->y_block_width * s->y_block_height *
541  return ret;
542 
543  if (avctx->pix_fmt != AV_PIX_FMT_YUV410P) {
544  av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
545  return -1;
546  }
547 
548  if (!s->current_picture.data[0]) {
549  if ((ret = ff_get_buffer(avctx, &s->current_picture))< 0 ||
550  (ret = ff_get_buffer(avctx, &s->last_picture)) < 0) {
551  return ret;
552  }
553  s->scratchbuf = av_malloc(s->current_picture.linesize[0] * 16 * 2);
554  }
555 
556  temp = s->current_picture;
558  s->last_picture = temp;
559 
560  init_put_bits(&s->pb, pkt->data, pkt->size);
561 
562  *p = *pict;
563  p->pict_type = avctx->gop_size && avctx->frame_number % avctx->gop_size ?
566 
568  for (i = 0; i < 3; i++)
569  if (svq1_encode_plane(s, i,
570  s->picture.data[i],
571  s->last_picture.data[i],
572  s->current_picture.data[i],
573  s->frame_width / (i ? 4 : 1),
574  s->frame_height / (i ? 4 : 1),
575  s->picture.linesize[i],
576  s->current_picture.linesize[i]) < 0)
577  return -1;
578 
579  // avpriv_align_put_bits(&s->pb);
580  while (put_bits_count(&s->pb) & 31)
581  put_bits(&s->pb, 1, 0);
582 
583  flush_put_bits(&s->pb);
584 
585  pkt->size = put_bits_count(&s->pb) / 8;
586  if (p->pict_type == AV_PICTURE_TYPE_I)
587  pkt->flags |= AV_PKT_FLAG_KEY;
588  *got_packet = 1;
589 
590  return 0;
591 }
592 
594 {
595  SVQ1Context *const s = avctx->priv_data;
596  int i;
597 
598  av_log(avctx, AV_LOG_DEBUG, "RD: %f\n",
599  s->rd_total / (double)(avctx->width * avctx->height *
600  avctx->frame_number));
601 
602  av_freep(&s->m.me.scratchpad);
603  av_freep(&s->m.me.map);
604  av_freep(&s->m.me.score_map);
605  av_freep(&s->mb_type);
606  av_freep(&s->dummy);
607  av_freep(&s->scratchbuf);
608 
609  for (i = 0; i < 3; i++) {
610  av_freep(&s->motion_val8[i]);
611  av_freep(&s->motion_val16[i]);
612  }
613  if(s->current_picture.data[0])
614  avctx->release_buffer(avctx, &s->current_picture);
615  if(s->last_picture.data[0])
616  avctx->release_buffer(avctx, &s->last_picture);
617 
618  return 0;
619 }
620 
622  .name = "svq1",
623  .type = AVMEDIA_TYPE_VIDEO,
624  .id = AV_CODEC_ID_SVQ1,
625  .priv_data_size = sizeof(SVQ1Context),
627  .encode2 = svq1_encode_frame,
629  .pix_fmts = (const enum PixelFormat[]) { AV_PIX_FMT_YUV410P,
630  AV_PIX_FMT_NONE },
631  .long_name = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1"),
632 };