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mpeg4videoenc.c
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1 /*
2  * MPEG4 encoder.
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "libavutil/attributes.h"
24 #include "libavutil/log.h"
25 #include "libavutil/opt.h"
26 #include "mpegvideo.h"
27 #include "h263.h"
28 #include "mpeg4video.h"
29 
30 /* The uni_DCtab_* tables below contain unified bits+length tables to encode DC
31  * differences in mpeg4. Unified in the sense that the specification specifies
32  * this encoding in several steps. */
35 static uint16_t uni_DCtab_lum_bits[512];
36 static uint16_t uni_DCtab_chrom_bits[512];
37 
38 /* Unified encoding tables for run length encoding of coefficients.
39  * Unified in the sense that the specification specifies the encoding in several steps. */
40 static uint32_t uni_mpeg4_intra_rl_bits[64 * 64 * 2 * 2];
41 static uint8_t uni_mpeg4_intra_rl_len[64 * 64 * 2 * 2];
42 static uint32_t uni_mpeg4_inter_rl_bits[64 * 64 * 2 * 2];
43 static uint8_t uni_mpeg4_inter_rl_len[64 * 64 * 2 * 2];
44 
45 //#define UNI_MPEG4_ENC_INDEX(last, run, level) ((last) * 128 + (run) * 256 + (level))
46 //#define UNI_MPEG4_ENC_INDEX(last, run, level) ((last) * 128 * 64 + (run) + (level) * 64)
47 #define UNI_MPEG4_ENC_INDEX(last, run, level) ((last) * 128 * 64 + (run) * 128 + (level))
48 
49 /* mpeg4
50  * inter
51  * max level: 24/6
52  * max run: 53/63
53  *
54  * intra
55  * max level: 53/16
56  * max run: 29/41
57  */
58 
59 /**
60  * Return the number of bits that encoding the 8x8 block in block would need.
61  * @param[in] block_last_index last index in scantable order that refers to a non zero element in block.
62  */
63 static inline int get_block_rate(MpegEncContext *s, int16_t block[64],
64  int block_last_index, uint8_t scantable[64])
65 {
66  int last = 0;
67  int j;
68  int rate = 0;
69 
70  for (j = 1; j <= block_last_index; j++) {
71  const int index = scantable[j];
72  int level = block[index];
73  if (level) {
74  level += 64;
75  if ((level & (~127)) == 0) {
76  if (j < block_last_index)
77  rate += s->intra_ac_vlc_length[UNI_AC_ENC_INDEX(j - last - 1, level)];
78  else
79  rate += s->intra_ac_vlc_last_length[UNI_AC_ENC_INDEX(j - last - 1, level)];
80  } else
81  rate += s->ac_esc_length;
82 
83  last = j;
84  }
85  }
86 
87  return rate;
88 }
89 
90 /**
91  * Restore the ac coefficients in block that have been changed by decide_ac_pred().
92  * This function also restores s->block_last_index.
93  * @param[in,out] block MB coefficients, these will be restored
94  * @param[in] dir ac prediction direction for each 8x8 block
95  * @param[out] st scantable for each 8x8 block
96  * @param[in] zigzag_last_index index referring to the last non zero coefficient in zigzag order
97  */
98 static inline void restore_ac_coeffs(MpegEncContext *s, int16_t block[6][64],
99  const int dir[6], uint8_t *st[6],
100  const int zigzag_last_index[6])
101 {
102  int i, n;
103  memcpy(s->block_last_index, zigzag_last_index, sizeof(int) * 6);
104 
105  for (n = 0; n < 6; n++) {
106  int16_t *ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
107 
108  st[n] = s->intra_scantable.permutated;
109  if (dir[n]) {
110  /* top prediction */
111  for (i = 1; i < 8; i++)
112  block[n][s->dsp.idct_permutation[i]] = ac_val[i + 8];
113  } else {
114  /* left prediction */
115  for (i = 1; i < 8; i++)
116  block[n][s->dsp.idct_permutation[i << 3]] = ac_val[i];
117  }
118  }
119 }
120 
121 /**
122  * Return the optimal value (0 or 1) for the ac_pred element for the given MB in mpeg4.
123  * This function will also update s->block_last_index and s->ac_val.
124  * @param[in,out] block MB coefficients, these will be updated if 1 is returned
125  * @param[in] dir ac prediction direction for each 8x8 block
126  * @param[out] st scantable for each 8x8 block
127  * @param[out] zigzag_last_index index referring to the last non zero coefficient in zigzag order
128  */
129 static inline int decide_ac_pred(MpegEncContext *s, int16_t block[6][64],
130  const int dir[6], uint8_t *st[6],
131  int zigzag_last_index[6])
132 {
133  int score = 0;
134  int i, n;
135  int8_t *const qscale_table = s->current_picture.qscale_table;
136 
137  memcpy(zigzag_last_index, s->block_last_index, sizeof(int) * 6);
138 
139  for (n = 0; n < 6; n++) {
140  int16_t *ac_val, *ac_val1;
141 
142  score -= get_block_rate(s, block[n], s->block_last_index[n],
144 
145  ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
146  ac_val1 = ac_val;
147  if (dir[n]) {
148  const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
149  /* top prediction */
150  ac_val -= s->block_wrap[n] * 16;
151  if (s->mb_y == 0 || s->qscale == qscale_table[xy] || n == 2 || n == 3) {
152  /* same qscale */
153  for (i = 1; i < 8; i++) {
154  const int level = block[n][s->dsp.idct_permutation[i]];
155  block[n][s->dsp.idct_permutation[i]] = level - ac_val[i + 8];
156  ac_val1[i] = block[n][s->dsp.idct_permutation[i << 3]];
157  ac_val1[i + 8] = level;
158  }
159  } else {
160  /* different qscale, we must rescale */
161  for (i = 1; i < 8; i++) {
162  const int level = block[n][s->dsp.idct_permutation[i]];
163  block[n][s->dsp.idct_permutation[i]] = level - ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
164  ac_val1[i] = block[n][s->dsp.idct_permutation[i << 3]];
165  ac_val1[i + 8] = level;
166  }
167  }
168  st[n] = s->intra_h_scantable.permutated;
169  } else {
170  const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
171  /* left prediction */
172  ac_val -= 16;
173  if (s->mb_x == 0 || s->qscale == qscale_table[xy] || n == 1 || n == 3) {
174  /* same qscale */
175  for (i = 1; i < 8; i++) {
176  const int level = block[n][s->dsp.idct_permutation[i << 3]];
177  block[n][s->dsp.idct_permutation[i << 3]] = level - ac_val[i];
178  ac_val1[i] = level;
179  ac_val1[i + 8] = block[n][s->dsp.idct_permutation[i]];
180  }
181  } else {
182  /* different qscale, we must rescale */
183  for (i = 1; i < 8; i++) {
184  const int level = block[n][s->dsp.idct_permutation[i << 3]];
185  block[n][s->dsp.idct_permutation[i << 3]] = level - ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
186  ac_val1[i] = level;
187  ac_val1[i + 8] = block[n][s->dsp.idct_permutation[i]];
188  }
189  }
190  st[n] = s->intra_v_scantable.permutated;
191  }
192 
193  for (i = 63; i > 0; i--) // FIXME optimize
194  if (block[n][st[n][i]])
195  break;
196  s->block_last_index[n] = i;
197 
198  score += get_block_rate(s, block[n], s->block_last_index[n], st[n]);
199  }
200 
201  if (score < 0) {
202  return 1;
203  } else {
204  restore_ac_coeffs(s, block, dir, st, zigzag_last_index);
205  return 0;
206  }
207 }
208 
209 /**
210  * modify mb_type & qscale so that encoding is actually possible in mpeg4
211  */
213 {
214  int i;
215  int8_t *const qscale_table = s->current_picture.qscale_table;
216 
218 
219  if (s->pict_type == AV_PICTURE_TYPE_B) {
220  int odd = 0;
221  /* ok, come on, this isn't funny anymore, there's more code for
222  * handling this mpeg4 mess than for the actual adaptive quantization */
223 
224  for (i = 0; i < s->mb_num; i++) {
225  int mb_xy = s->mb_index2xy[i];
226  odd += qscale_table[mb_xy] & 1;
227  }
228 
229  if (2 * odd > s->mb_num)
230  odd = 1;
231  else
232  odd = 0;
233 
234  for (i = 0; i < s->mb_num; i++) {
235  int mb_xy = s->mb_index2xy[i];
236  if ((qscale_table[mb_xy] & 1) != odd)
237  qscale_table[mb_xy]++;
238  if (qscale_table[mb_xy] > 31)
239  qscale_table[mb_xy] = 31;
240  }
241 
242  for (i = 1; i < s->mb_num; i++) {
243  int mb_xy = s->mb_index2xy[i];
244  if (qscale_table[mb_xy] != qscale_table[s->mb_index2xy[i - 1]] &&
245  (s->mb_type[mb_xy] & CANDIDATE_MB_TYPE_DIRECT)) {
246  s->mb_type[mb_xy] |= CANDIDATE_MB_TYPE_BIDIR;
247  }
248  }
249  }
250 }
251 
252 /**
253  * Encode the dc value.
254  * @param n block index (0-3 are luma, 4-5 are chroma)
255  */
256 static inline void mpeg4_encode_dc(PutBitContext *s, int level, int n)
257 {
258 #if 1
259  /* DC will overflow if level is outside the [-255,255] range. */
260  level += 256;
261  if (n < 4) {
262  /* luminance */
263  put_bits(s, uni_DCtab_lum_len[level], uni_DCtab_lum_bits[level]);
264  } else {
265  /* chrominance */
267  }
268 #else
269  int size, v;
270  /* find number of bits */
271  size = 0;
272  v = abs(level);
273  while (v) {
274  v >>= 1;
275  size++;
276  }
277 
278  if (n < 4) {
279  /* luminance */
280  put_bits(&s->pb, ff_mpeg4_DCtab_lum[size][1], ff_mpeg4_DCtab_lum[size][0]);
281  } else {
282  /* chrominance */
283  put_bits(&s->pb, ff_mpeg4_DCtab_chrom[size][1], ff_mpeg4_DCtab_chrom[size][0]);
284  }
285 
286  /* encode remaining bits */
287  if (size > 0) {
288  if (level < 0)
289  level = (-level) ^ ((1 << size) - 1);
290  put_bits(&s->pb, size, level);
291  if (size > 8)
292  put_bits(&s->pb, 1, 1);
293  }
294 #endif
295 }
296 
297 static inline int mpeg4_get_dc_length(int level, int n)
298 {
299  if (n < 4)
300  return uni_DCtab_lum_len[level + 256];
301  else
302  return uni_DCtab_chrom_len[level + 256];
303 }
304 
305 /**
306  * Encode an 8x8 block.
307  * @param n block index (0-3 are luma, 4-5 are chroma)
308  */
309 static inline void mpeg4_encode_block(MpegEncContext *s,
310  int16_t *block, int n, int intra_dc,
311  uint8_t *scan_table, PutBitContext *dc_pb,
312  PutBitContext *ac_pb)
313 {
314  int i, last_non_zero;
315  uint32_t *bits_tab;
316  uint8_t *len_tab;
317  const int last_index = s->block_last_index[n];
318 
319  if (s->mb_intra) { // Note gcc (3.2.1 at least) will optimize this away
320  /* mpeg4 based DC predictor */
321  mpeg4_encode_dc(dc_pb, intra_dc, n);
322  if (last_index < 1)
323  return;
324  i = 1;
325  bits_tab = uni_mpeg4_intra_rl_bits;
326  len_tab = uni_mpeg4_intra_rl_len;
327  } else {
328  if (last_index < 0)
329  return;
330  i = 0;
331  bits_tab = uni_mpeg4_inter_rl_bits;
332  len_tab = uni_mpeg4_inter_rl_len;
333  }
334 
335  /* AC coefs */
336  last_non_zero = i - 1;
337  for (; i < last_index; i++) {
338  int level = block[scan_table[i]];
339  if (level) {
340  int run = i - last_non_zero - 1;
341  level += 64;
342  if ((level & (~127)) == 0) {
343  const int index = UNI_MPEG4_ENC_INDEX(0, run, level);
344  put_bits(ac_pb, len_tab[index], bits_tab[index]);
345  } else { // ESC3
346  put_bits(ac_pb,
347  7 + 2 + 1 + 6 + 1 + 12 + 1,
348  (3 << 23) + (3 << 21) + (0 << 20) + (run << 14) +
349  (1 << 13) + (((level - 64) & 0xfff) << 1) + 1);
350  }
351  last_non_zero = i;
352  }
353  }
354  /* if (i <= last_index) */ {
355  int level = block[scan_table[i]];
356  int run = i - last_non_zero - 1;
357  level += 64;
358  if ((level & (~127)) == 0) {
359  const int index = UNI_MPEG4_ENC_INDEX(1, run, level);
360  put_bits(ac_pb, len_tab[index], bits_tab[index]);
361  } else { // ESC3
362  put_bits(ac_pb,
363  7 + 2 + 1 + 6 + 1 + 12 + 1,
364  (3 << 23) + (3 << 21) + (1 << 20) + (run << 14) +
365  (1 << 13) + (((level - 64) & 0xfff) << 1) + 1);
366  }
367  }
368 }
369 
371  int16_t *block, int n,
372  int intra_dc, uint8_t *scan_table)
373 {
374  int i, last_non_zero;
375  uint8_t *len_tab;
376  const int last_index = s->block_last_index[n];
377  int len = 0;
378 
379  if (s->mb_intra) { // Note gcc (3.2.1 at least) will optimize this away
380  /* mpeg4 based DC predictor */
381  len += mpeg4_get_dc_length(intra_dc, n);
382  if (last_index < 1)
383  return len;
384  i = 1;
385  len_tab = uni_mpeg4_intra_rl_len;
386  } else {
387  if (last_index < 0)
388  return 0;
389  i = 0;
390  len_tab = uni_mpeg4_inter_rl_len;
391  }
392 
393  /* AC coefs */
394  last_non_zero = i - 1;
395  for (; i < last_index; i++) {
396  int level = block[scan_table[i]];
397  if (level) {
398  int run = i - last_non_zero - 1;
399  level += 64;
400  if ((level & (~127)) == 0) {
401  const int index = UNI_MPEG4_ENC_INDEX(0, run, level);
402  len += len_tab[index];
403  } else { // ESC3
404  len += 7 + 2 + 1 + 6 + 1 + 12 + 1;
405  }
406  last_non_zero = i;
407  }
408  }
409  /* if (i <= last_index) */ {
410  int level = block[scan_table[i]];
411  int run = i - last_non_zero - 1;
412  level += 64;
413  if ((level & (~127)) == 0) {
414  const int index = UNI_MPEG4_ENC_INDEX(1, run, level);
415  len += len_tab[index];
416  } else { // ESC3
417  len += 7 + 2 + 1 + 6 + 1 + 12 + 1;
418  }
419  }
420 
421  return len;
422 }
423 
424 static inline void mpeg4_encode_blocks(MpegEncContext *s, int16_t block[6][64],
425  int intra_dc[6], uint8_t **scan_table,
426  PutBitContext *dc_pb,
427  PutBitContext *ac_pb)
428 {
429  int i;
430 
431  if (scan_table) {
432  if (s->flags2 & CODEC_FLAG2_NO_OUTPUT) {
433  for (i = 0; i < 6; i++)
434  skip_put_bits(&s->pb,
435  mpeg4_get_block_length(s, block[i], i,
436  intra_dc[i], scan_table[i]));
437  } else {
438  /* encode each block */
439  for (i = 0; i < 6; i++)
440  mpeg4_encode_block(s, block[i], i,
441  intra_dc[i], scan_table[i], dc_pb, ac_pb);
442  }
443  } else {
444  if (s->flags2 & CODEC_FLAG2_NO_OUTPUT) {
445  for (i = 0; i < 6; i++)
446  skip_put_bits(&s->pb,
447  mpeg4_get_block_length(s, block[i], i, 0,
449  } else {
450  /* encode each block */
451  for (i = 0; i < 6; i++)
452  mpeg4_encode_block(s, block[i], i, 0,
453  s->intra_scantable.permutated, dc_pb, ac_pb);
454  }
455  }
456 }
457 
458 static inline int get_b_cbp(MpegEncContext *s, int16_t block[6][64],
459  int motion_x, int motion_y, int mb_type)
460 {
461  int cbp = 0, i;
462 
463  if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) {
464  int score = 0;
465  const int lambda = s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
466 
467  for (i = 0; i < 6; i++) {
468  if (s->coded_score[i] < 0) {
469  score += s->coded_score[i];
470  cbp |= 1 << (5 - i);
471  }
472  }
473 
474  if (cbp) {
475  int zero_score = -6;
476  if ((motion_x | motion_y | s->dquant | mb_type) == 0)
477  zero_score -= 4; // 2 * MV + mb_type + cbp bit
478 
479  zero_score *= lambda;
480  if (zero_score <= score)
481  cbp = 0;
482  }
483 
484  for (i = 0; i < 6; i++) {
485  if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i)) & 1) == 0) {
486  s->block_last_index[i] = -1;
487  s->dsp.clear_block(s->block[i]);
488  }
489  }
490  } else {
491  for (i = 0; i < 6; i++) {
492  if (s->block_last_index[i] >= 0)
493  cbp |= 1 << (5 - i);
494  }
495  }
496  return cbp;
497 }
498 
499 // FIXME this is duplicated to h263.c
500 static const int dquant_code[5] = { 1, 0, 9, 2, 3 };
501 
502 void ff_mpeg4_encode_mb(MpegEncContext *s, int16_t block[6][64],
503  int motion_x, int motion_y)
504 {
505  int cbpc, cbpy, pred_x, pred_y;
506  PutBitContext *const pb2 = s->data_partitioning ? &s->pb2 : &s->pb;
507  PutBitContext *const tex_pb = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B ? &s->tex_pb : &s->pb;
508  PutBitContext *const dc_pb = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_I ? &s->pb2 : &s->pb;
509  const int interleaved_stats = (s->flags & CODEC_FLAG_PASS1) && !s->data_partitioning ? 1 : 0;
510 
511  if (!s->mb_intra) {
512  int i, cbp;
513 
514  if (s->pict_type == AV_PICTURE_TYPE_B) {
515  /* convert from mv_dir to type */
516  static const int mb_type_table[8] = { -1, 3, 2, 1, -1, -1, -1, 0 };
517  int mb_type = mb_type_table[s->mv_dir];
518 
519  if (s->mb_x == 0) {
520  for (i = 0; i < 2; i++)
521  s->last_mv[i][0][0] =
522  s->last_mv[i][0][1] =
523  s->last_mv[i][1][0] =
524  s->last_mv[i][1][1] = 0;
525  }
526 
527  av_assert2(s->dquant >= -2 && s->dquant <= 2);
528  av_assert2((s->dquant & 1) == 0);
529  av_assert2(mb_type >= 0);
530 
531  /* nothing to do if this MB was skipped in the next P Frame */
532  if (s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]) { // FIXME avoid DCT & ...
533  s->skip_count++;
534  s->mv[0][0][0] =
535  s->mv[0][0][1] =
536  s->mv[1][0][0] =
537  s->mv[1][0][1] = 0;
538  s->mv_dir = MV_DIR_FORWARD; // doesn't matter
539  s->qscale -= s->dquant;
540 // s->mb_skipped = 1;
541 
542  return;
543  }
544 
545  cbp = get_b_cbp(s, block, motion_x, motion_y, mb_type);
546 
547  if ((cbp | motion_x | motion_y | mb_type) == 0) {
548  /* direct MB with MV={0,0} */
549  av_assert2(s->dquant == 0);
550 
551  put_bits(&s->pb, 1, 1); /* mb not coded modb1=1 */
552 
553  if (interleaved_stats) {
554  s->misc_bits++;
555  s->last_bits++;
556  }
557  s->skip_count++;
558  return;
559  }
560 
561  put_bits(&s->pb, 1, 0); /* mb coded modb1=0 */
562  put_bits(&s->pb, 1, cbp ? 0 : 1); /* modb2 */ // FIXME merge
563  put_bits(&s->pb, mb_type + 1, 1); // this table is so simple that we don't need it :)
564  if (cbp)
565  put_bits(&s->pb, 6, cbp);
566 
567  if (cbp && mb_type) {
568  if (s->dquant)
569  put_bits(&s->pb, 2, (s->dquant >> 2) + 3);
570  else
571  put_bits(&s->pb, 1, 0);
572  } else
573  s->qscale -= s->dquant;
574 
575  if (!s->progressive_sequence) {
576  if (cbp)
577  put_bits(&s->pb, 1, s->interlaced_dct);
578  if (mb_type) // not direct mode
579  put_bits(&s->pb, 1, s->mv_type == MV_TYPE_FIELD);
580  }
581 
582  if (interleaved_stats)
583  s->misc_bits += get_bits_diff(s);
584 
585  if (!mb_type) {
587  ff_h263_encode_motion_vector(s, motion_x, motion_y, 1);
588  s->b_count++;
589  s->f_count++;
590  } else {
591  av_assert2(mb_type > 0 && mb_type < 4);
592  if (s->mv_type != MV_TYPE_FIELD) {
593  if (s->mv_dir & MV_DIR_FORWARD) {
595  s->mv[0][0][0] - s->last_mv[0][0][0],
596  s->mv[0][0][1] - s->last_mv[0][0][1],
597  s->f_code);
598  s->last_mv[0][0][0] =
599  s->last_mv[0][1][0] = s->mv[0][0][0];
600  s->last_mv[0][0][1] =
601  s->last_mv[0][1][1] = s->mv[0][0][1];
602  s->f_count++;
603  }
604  if (s->mv_dir & MV_DIR_BACKWARD) {
606  s->mv[1][0][0] - s->last_mv[1][0][0],
607  s->mv[1][0][1] - s->last_mv[1][0][1],
608  s->b_code);
609  s->last_mv[1][0][0] =
610  s->last_mv[1][1][0] = s->mv[1][0][0];
611  s->last_mv[1][0][1] =
612  s->last_mv[1][1][1] = s->mv[1][0][1];
613  s->b_count++;
614  }
615  } else {
616  if (s->mv_dir & MV_DIR_FORWARD) {
617  put_bits(&s->pb, 1, s->field_select[0][0]);
618  put_bits(&s->pb, 1, s->field_select[0][1]);
619  }
620  if (s->mv_dir & MV_DIR_BACKWARD) {
621  put_bits(&s->pb, 1, s->field_select[1][0]);
622  put_bits(&s->pb, 1, s->field_select[1][1]);
623  }
624  if (s->mv_dir & MV_DIR_FORWARD) {
625  for (i = 0; i < 2; i++) {
627  s->mv[0][i][0] - s->last_mv[0][i][0],
628  s->mv[0][i][1] - s->last_mv[0][i][1] / 2,
629  s->f_code);
630  s->last_mv[0][i][0] = s->mv[0][i][0];
631  s->last_mv[0][i][1] = s->mv[0][i][1] * 2;
632  }
633  s->f_count++;
634  }
635  if (s->mv_dir & MV_DIR_BACKWARD) {
636  for (i = 0; i < 2; i++) {
638  s->mv[1][i][0] - s->last_mv[1][i][0],
639  s->mv[1][i][1] - s->last_mv[1][i][1] / 2,
640  s->b_code);
641  s->last_mv[1][i][0] = s->mv[1][i][0];
642  s->last_mv[1][i][1] = s->mv[1][i][1] * 2;
643  }
644  s->b_count++;
645  }
646  }
647  }
648 
649  if (interleaved_stats)
650  s->mv_bits += get_bits_diff(s);
651 
652  mpeg4_encode_blocks(s, block, NULL, NULL, NULL, &s->pb);
653 
654  if (interleaved_stats)
655  s->p_tex_bits += get_bits_diff(s);
656  } else { /* s->pict_type==AV_PICTURE_TYPE_B */
657  cbp = get_p_cbp(s, block, motion_x, motion_y);
658 
659  if ((cbp | motion_x | motion_y | s->dquant) == 0 &&
660  s->mv_type == MV_TYPE_16X16) {
661  /* check if the B frames can skip it too, as we must skip it
662  * if we skip here why didn't they just compress
663  * the skip-mb bits instead of reusing them ?! */
664  if (s->max_b_frames > 0) {
665  int i;
666  int x, y, offset;
667  uint8_t *p_pic;
668 
669  x = s->mb_x * 16;
670  y = s->mb_y * 16;
671 
672  offset = x + y * s->linesize;
673  p_pic = s->new_picture.f.data[0] + offset;
674 
675  s->mb_skipped = 1;
676  for (i = 0; i < s->max_b_frames; i++) {
677  uint8_t *b_pic;
678  int diff;
679  Picture *pic = s->reordered_input_picture[i + 1];
680 
681  if (!pic || pic->f.pict_type != AV_PICTURE_TYPE_B)
682  break;
683 
684  b_pic = pic->f.data[0] + offset;
685  if (!pic->shared)
686  b_pic += INPLACE_OFFSET;
687 
688  if (x + 16 > s->width || y + 16 > s->height) {
689  int x1, y1;
690  int xe = FFMIN(16, s->width - x);
691  int ye = FFMIN(16, s->height - y);
692  diff = 0;
693  for (y1 = 0; y1 < ye; y1++) {
694  for (x1 = 0; x1 < xe; x1++) {
695  diff += FFABS(p_pic[x1 + y1 * s->linesize] - b_pic[x1 + y1 * s->linesize]);
696  }
697  }
698  diff = diff * 256 / (xe * ye);
699  } else {
700  diff = s->dsp.sad[0](NULL, p_pic, b_pic, s->linesize, 16);
701  }
702  if (diff > s->qscale * 70) { // FIXME check that 70 is optimal
703  s->mb_skipped = 0;
704  break;
705  }
706  }
707  } else
708  s->mb_skipped = 1;
709 
710  if (s->mb_skipped == 1) {
711  /* skip macroblock */
712  put_bits(&s->pb, 1, 1);
713 
714  if (interleaved_stats) {
715  s->misc_bits++;
716  s->last_bits++;
717  }
718  s->skip_count++;
719 
720  return;
721  }
722  }
723 
724  put_bits(&s->pb, 1, 0); /* mb coded */
725  cbpc = cbp & 3;
726  cbpy = cbp >> 2;
727  cbpy ^= 0xf;
728  if (s->mv_type == MV_TYPE_16X16) {
729  if (s->dquant)
730  cbpc += 8;
731  put_bits(&s->pb,
734 
735  put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
736  if (s->dquant)
737  put_bits(pb2, 2, dquant_code[s->dquant + 2]);
738 
739  if (!s->progressive_sequence) {
740  if (cbp)
741  put_bits(pb2, 1, s->interlaced_dct);
742  put_bits(pb2, 1, 0);
743  }
744 
745  if (interleaved_stats)
746  s->misc_bits += get_bits_diff(s);
747 
748  /* motion vectors: 16x16 mode */
749  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
750 
752  motion_x - pred_x,
753  motion_y - pred_y,
754  s->f_code);
755  } else if (s->mv_type == MV_TYPE_FIELD) {
756  if (s->dquant)
757  cbpc += 8;
758  put_bits(&s->pb,
761 
762  put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
763  if (s->dquant)
764  put_bits(pb2, 2, dquant_code[s->dquant + 2]);
765 
767  if (cbp)
768  put_bits(pb2, 1, s->interlaced_dct);
769  put_bits(pb2, 1, 1);
770 
771  if (interleaved_stats)
772  s->misc_bits += get_bits_diff(s);
773 
774  /* motion vectors: 16x8 interlaced mode */
775  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
776  pred_y /= 2;
777 
778  put_bits(&s->pb, 1, s->field_select[0][0]);
779  put_bits(&s->pb, 1, s->field_select[0][1]);
780 
782  s->mv[0][0][0] - pred_x,
783  s->mv[0][0][1] - pred_y,
784  s->f_code);
786  s->mv[0][1][0] - pred_x,
787  s->mv[0][1][1] - pred_y,
788  s->f_code);
789  } else {
791  put_bits(&s->pb,
792  ff_h263_inter_MCBPC_bits[cbpc + 16],
793  ff_h263_inter_MCBPC_code[cbpc + 16]);
794  put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
795 
796  if (!s->progressive_sequence && cbp)
797  put_bits(pb2, 1, s->interlaced_dct);
798 
799  if (interleaved_stats)
800  s->misc_bits += get_bits_diff(s);
801 
802  for (i = 0; i < 4; i++) {
803  /* motion vectors: 8x8 mode*/
804  ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
805 
807  s->current_picture.motion_val[0][s->block_index[i]][0] - pred_x,
808  s->current_picture.motion_val[0][s->block_index[i]][1] - pred_y,
809  s->f_code);
810  }
811  }
812 
813  if (interleaved_stats)
814  s->mv_bits += get_bits_diff(s);
815 
816  mpeg4_encode_blocks(s, block, NULL, NULL, NULL, tex_pb);
817 
818  if (interleaved_stats)
819  s->p_tex_bits += get_bits_diff(s);
820 
821  s->f_count++;
822  }
823  } else {
824  int cbp;
825  int dc_diff[6]; // dc values with the dc prediction subtracted
826  int dir[6]; // prediction direction
827  int zigzag_last_index[6];
828  uint8_t *scan_table[6];
829  int i;
830 
831  for (i = 0; i < 6; i++)
832  dc_diff[i] = ff_mpeg4_pred_dc(s, i, block[i][0], &dir[i], 1);
833 
834  if (s->flags & CODEC_FLAG_AC_PRED) {
835  s->ac_pred = decide_ac_pred(s, block, dir, scan_table, zigzag_last_index);
836  } else {
837  for (i = 0; i < 6; i++)
838  scan_table[i] = s->intra_scantable.permutated;
839  }
840 
841  /* compute cbp */
842  cbp = 0;
843  for (i = 0; i < 6; i++)
844  if (s->block_last_index[i] >= 1)
845  cbp |= 1 << (5 - i);
846 
847  cbpc = cbp & 3;
848  if (s->pict_type == AV_PICTURE_TYPE_I) {
849  if (s->dquant)
850  cbpc += 4;
851  put_bits(&s->pb,
854  } else {
855  if (s->dquant)
856  cbpc += 8;
857  put_bits(&s->pb, 1, 0); /* mb coded */
858  put_bits(&s->pb,
859  ff_h263_inter_MCBPC_bits[cbpc + 4],
860  ff_h263_inter_MCBPC_code[cbpc + 4]);
861  }
862  put_bits(pb2, 1, s->ac_pred);
863  cbpy = cbp >> 2;
864  put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
865  if (s->dquant)
866  put_bits(dc_pb, 2, dquant_code[s->dquant + 2]);
867 
868  if (!s->progressive_sequence)
869  put_bits(dc_pb, 1, s->interlaced_dct);
870 
871  if (interleaved_stats)
872  s->misc_bits += get_bits_diff(s);
873 
874  mpeg4_encode_blocks(s, block, dc_diff, scan_table, dc_pb, tex_pb);
875 
876  if (interleaved_stats)
877  s->i_tex_bits += get_bits_diff(s);
878  s->i_count++;
879 
880  /* restore ac coeffs & last_index stuff
881  * if we messed them up with the prediction */
882  if (s->ac_pred)
883  restore_ac_coeffs(s, block, dir, scan_table, zigzag_last_index);
884  }
885 }
886 
887 /**
888  * add mpeg4 stuffing bits (01...1)
889  */
891 {
892  int length;
893  put_bits(pbc, 1, 0);
894  length = (-put_bits_count(pbc)) & 7;
895  if (length)
896  put_bits(pbc, length, (1 << length) - 1);
897 }
898 
899 /* must be called before writing the header */
901 {
902  if (s->pict_type == AV_PICTURE_TYPE_B) {
904  } else {
905  s->last_time_base = s->time_base;
906  s->time_base = FFUDIV(s->time, s->avctx->time_base.den);
907  }
908 }
909 
911 {
912  int hours, minutes, seconds;
913  int64_t time;
914 
915  put_bits(&s->pb, 16, 0);
916  put_bits(&s->pb, 16, GOP_STARTCODE);
917 
918  time = s->current_picture_ptr->f.pts;
919  if (s->reordered_input_picture[1])
920  time = FFMIN(time, s->reordered_input_picture[1]->f.pts);
921  time = time * s->avctx->time_base.num;
922  s->last_time_base = FFUDIV(time, s->avctx->time_base.den);
923 
924  seconds = FFUDIV(time, s->avctx->time_base.den);
925  minutes = FFUDIV(seconds, 60); seconds = FFUMOD(seconds, 60);
926  hours = FFUDIV(minutes, 60); minutes = FFUMOD(minutes, 60);
927  hours = FFUMOD(hours , 24);
928 
929  put_bits(&s->pb, 5, hours);
930  put_bits(&s->pb, 6, minutes);
931  put_bits(&s->pb, 1, 1);
932  put_bits(&s->pb, 6, seconds);
933 
934  put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
935  put_bits(&s->pb, 1, 0); // broken link == NO
936 
937  ff_mpeg4_stuffing(&s->pb);
938 }
939 
941 {
942  int profile_and_level_indication;
943  int vo_ver_id;
944 
945  if (s->avctx->profile != FF_PROFILE_UNKNOWN) {
946  profile_and_level_indication = s->avctx->profile << 4;
947  } else if (s->max_b_frames || s->quarter_sample) {
948  profile_and_level_indication = 0xF0; // adv simple
949  } else {
950  profile_and_level_indication = 0x00; // simple
951  }
952 
953  if (s->avctx->level != FF_LEVEL_UNKNOWN)
954  profile_and_level_indication |= s->avctx->level;
955  else
956  profile_and_level_indication |= 1; // level 1
957 
958  if (profile_and_level_indication >> 4 == 0xF)
959  vo_ver_id = 5;
960  else
961  vo_ver_id = 1;
962 
963  // FIXME levels
964 
965  put_bits(&s->pb, 16, 0);
966  put_bits(&s->pb, 16, VOS_STARTCODE);
967 
968  put_bits(&s->pb, 8, profile_and_level_indication);
969 
970  put_bits(&s->pb, 16, 0);
971  put_bits(&s->pb, 16, VISUAL_OBJ_STARTCODE);
972 
973  put_bits(&s->pb, 1, 1);
974  put_bits(&s->pb, 4, vo_ver_id);
975  put_bits(&s->pb, 3, 1); // priority
976 
977  put_bits(&s->pb, 4, 1); // visual obj type== video obj
978 
979  put_bits(&s->pb, 1, 0); // video signal type == no clue // FIXME
980 
981  ff_mpeg4_stuffing(&s->pb);
982 }
983 
985  int vo_number,
986  int vol_number)
987 {
988  int vo_ver_id;
989 
990  if (!CONFIG_MPEG4_ENCODER)
991  return;
992 
993  if (s->max_b_frames || s->quarter_sample) {
994  vo_ver_id = 5;
996  } else {
997  vo_ver_id = 1;
998  s->vo_type = SIMPLE_VO_TYPE;
999  }
1000 
1001  put_bits(&s->pb, 16, 0);
1002  put_bits(&s->pb, 16, 0x100 + vo_number); /* video obj */
1003  put_bits(&s->pb, 16, 0);
1004  put_bits(&s->pb, 16, 0x120 + vol_number); /* video obj layer */
1005 
1006  put_bits(&s->pb, 1, 0); /* random access vol */
1007  put_bits(&s->pb, 8, s->vo_type); /* video obj type indication */
1008  if (s->workaround_bugs & FF_BUG_MS) {
1009  put_bits(&s->pb, 1, 0); /* is obj layer id= no */
1010  } else {
1011  put_bits(&s->pb, 1, 1); /* is obj layer id= yes */
1012  put_bits(&s->pb, 4, vo_ver_id); /* is obj layer ver id */
1013  put_bits(&s->pb, 3, 1); /* is obj layer priority */
1014  }
1015 
1017 
1018  put_bits(&s->pb, 4, s->aspect_ratio_info); /* aspect ratio info */
1022  put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.num);
1023  put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.den);
1024  }
1025 
1026  if (s->workaround_bugs & FF_BUG_MS) {
1027  put_bits(&s->pb, 1, 0); /* vol control parameters= no @@@ */
1028  } else {
1029  put_bits(&s->pb, 1, 1); /* vol control parameters= yes */
1030  put_bits(&s->pb, 2, 1); /* chroma format YUV 420/YV12 */
1031  put_bits(&s->pb, 1, s->low_delay);
1032  put_bits(&s->pb, 1, 0); /* vbv parameters= no */
1033  }
1034 
1035  put_bits(&s->pb, 2, RECT_SHAPE); /* vol shape= rectangle */
1036  put_bits(&s->pb, 1, 1); /* marker bit */
1037 
1038  put_bits(&s->pb, 16, s->avctx->time_base.den);
1039  if (s->time_increment_bits < 1)
1040  s->time_increment_bits = 1;
1041  put_bits(&s->pb, 1, 1); /* marker bit */
1042  put_bits(&s->pb, 1, 0); /* fixed vop rate=no */
1043  put_bits(&s->pb, 1, 1); /* marker bit */
1044  put_bits(&s->pb, 13, s->width); /* vol width */
1045  put_bits(&s->pb, 1, 1); /* marker bit */
1046  put_bits(&s->pb, 13, s->height); /* vol height */
1047  put_bits(&s->pb, 1, 1); /* marker bit */
1048  put_bits(&s->pb, 1, s->progressive_sequence ? 0 : 1);
1049  put_bits(&s->pb, 1, 1); /* obmc disable */
1050  if (vo_ver_id == 1)
1051  put_bits(&s->pb, 1, 0); /* sprite enable */
1052  else
1053  put_bits(&s->pb, 2, 0); /* sprite enable */
1054 
1055  put_bits(&s->pb, 1, 0); /* not 8 bit == false */
1056  put_bits(&s->pb, 1, s->mpeg_quant); /* quant type= (0=h263 style)*/
1057 
1058  if (s->mpeg_quant) {
1061  }
1062 
1063  if (vo_ver_id != 1)
1064  put_bits(&s->pb, 1, s->quarter_sample);
1065  put_bits(&s->pb, 1, 1); /* complexity estimation disable */
1066  put_bits(&s->pb, 1, s->rtp_mode ? 0 : 1); /* resync marker disable */
1067  put_bits(&s->pb, 1, s->data_partitioning ? 1 : 0);
1068  if (s->data_partitioning)
1069  put_bits(&s->pb, 1, 0); /* no rvlc */
1070 
1071  if (vo_ver_id != 1) {
1072  put_bits(&s->pb, 1, 0); /* newpred */
1073  put_bits(&s->pb, 1, 0); /* reduced res vop */
1074  }
1075  put_bits(&s->pb, 1, 0); /* scalability */
1076 
1077  ff_mpeg4_stuffing(&s->pb);
1078 
1079  /* user data */
1080  if (!(s->flags & CODEC_FLAG_BITEXACT)) {
1081  put_bits(&s->pb, 16, 0);
1082  put_bits(&s->pb, 16, 0x1B2); /* user_data */
1084  }
1085 }
1086 
1087 /* write mpeg4 VOP header */
1089 {
1090  int time_incr;
1091  int time_div, time_mod;
1092 
1093  if (s->pict_type == AV_PICTURE_TYPE_I) {
1094  if (!(s->flags & CODEC_FLAG_GLOBAL_HEADER)) {
1095  if (s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT) // HACK, the reference sw is buggy
1097  if (s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT || picture_number == 0) // HACK, the reference sw is buggy
1098  mpeg4_encode_vol_header(s, 0, 0);
1099  }
1100  if (!(s->workaround_bugs & FF_BUG_MS))
1102  }
1103 
1105 
1106  put_bits(&s->pb, 16, 0); /* vop header */
1107  put_bits(&s->pb, 16, VOP_STARTCODE); /* vop header */
1108  put_bits(&s->pb, 2, s->pict_type - 1); /* pict type: I = 0 , P = 1 */
1109 
1110  time_div = FFUDIV(s->time, s->avctx->time_base.den);
1111  time_mod = FFUMOD(s->time, s->avctx->time_base.den);
1112  time_incr = time_div - s->last_time_base;
1113  av_assert0(time_incr >= 0);
1114  while (time_incr--)
1115  put_bits(&s->pb, 1, 1);
1116 
1117  put_bits(&s->pb, 1, 0);
1118 
1119  put_bits(&s->pb, 1, 1); /* marker */
1120  put_bits(&s->pb, s->time_increment_bits, time_mod); /* time increment */
1121  put_bits(&s->pb, 1, 1); /* marker */
1122  put_bits(&s->pb, 1, 1); /* vop coded */
1123  if (s->pict_type == AV_PICTURE_TYPE_P) {
1124  put_bits(&s->pb, 1, s->no_rounding); /* rounding type */
1125  }
1126  put_bits(&s->pb, 3, 0); /* intra dc VLC threshold */
1127  if (!s->progressive_sequence) {
1129  put_bits(&s->pb, 1, s->alternate_scan);
1130  }
1131  // FIXME sprite stuff
1132 
1133  put_bits(&s->pb, 5, s->qscale);
1134 
1135  if (s->pict_type != AV_PICTURE_TYPE_I)
1136  put_bits(&s->pb, 3, s->f_code); /* fcode_for */
1137  if (s->pict_type == AV_PICTURE_TYPE_B)
1138  put_bits(&s->pb, 3, s->b_code); /* fcode_back */
1139 }
1140 
1141 static av_cold void init_uni_dc_tab(void)
1142 {
1143  int level, uni_code, uni_len;
1144 
1145  for (level = -256; level < 256; level++) {
1146  int size, v, l;
1147  /* find number of bits */
1148  size = 0;
1149  v = abs(level);
1150  while (v) {
1151  v >>= 1;
1152  size++;
1153  }
1154 
1155  if (level < 0)
1156  l = (-level) ^ ((1 << size) - 1);
1157  else
1158  l = level;
1159 
1160  /* luminance */
1161  uni_code = ff_mpeg4_DCtab_lum[size][0];
1162  uni_len = ff_mpeg4_DCtab_lum[size][1];
1163 
1164  if (size > 0) {
1165  uni_code <<= size;
1166  uni_code |= l;
1167  uni_len += size;
1168  if (size > 8) {
1169  uni_code <<= 1;
1170  uni_code |= 1;
1171  uni_len++;
1172  }
1173  }
1174  uni_DCtab_lum_bits[level + 256] = uni_code;
1175  uni_DCtab_lum_len[level + 256] = uni_len;
1176 
1177  /* chrominance */
1178  uni_code = ff_mpeg4_DCtab_chrom[size][0];
1179  uni_len = ff_mpeg4_DCtab_chrom[size][1];
1180 
1181  if (size > 0) {
1182  uni_code <<= size;
1183  uni_code |= l;
1184  uni_len += size;
1185  if (size > 8) {
1186  uni_code <<= 1;
1187  uni_code |= 1;
1188  uni_len++;
1189  }
1190  }
1191  uni_DCtab_chrom_bits[level + 256] = uni_code;
1192  uni_DCtab_chrom_len[level + 256] = uni_len;
1193  }
1194 }
1195 
1196 static av_cold void init_uni_mpeg4_rl_tab(RLTable *rl, uint32_t *bits_tab,
1197  uint8_t *len_tab)
1198 {
1199  int slevel, run, last;
1200 
1201  av_assert0(MAX_LEVEL >= 64);
1202  av_assert0(MAX_RUN >= 63);
1203 
1204  for (slevel = -64; slevel < 64; slevel++) {
1205  if (slevel == 0)
1206  continue;
1207  for (run = 0; run < 64; run++) {
1208  for (last = 0; last <= 1; last++) {
1209  const int index = UNI_MPEG4_ENC_INDEX(last, run, slevel + 64);
1210  int level = slevel < 0 ? -slevel : slevel;
1211  int sign = slevel < 0 ? 1 : 0;
1212  int bits, len, code;
1213  int level1, run1;
1214 
1215  len_tab[index] = 100;
1216 
1217  /* ESC0 */
1218  code = get_rl_index(rl, last, run, level);
1219  bits = rl->table_vlc[code][0];
1220  len = rl->table_vlc[code][1];
1221  bits = bits * 2 + sign;
1222  len++;
1223 
1224  if (code != rl->n && len < len_tab[index]) {
1225  bits_tab[index] = bits;
1226  len_tab[index] = len;
1227  }
1228  /* ESC1 */
1229  bits = rl->table_vlc[rl->n][0];
1230  len = rl->table_vlc[rl->n][1];
1231  bits = bits * 2;
1232  len++; // esc1
1233  level1 = level - rl->max_level[last][run];
1234  if (level1 > 0) {
1235  code = get_rl_index(rl, last, run, level1);
1236  bits <<= rl->table_vlc[code][1];
1237  len += rl->table_vlc[code][1];
1238  bits += rl->table_vlc[code][0];
1239  bits = bits * 2 + sign;
1240  len++;
1241 
1242  if (code != rl->n && len < len_tab[index]) {
1243  bits_tab[index] = bits;
1244  len_tab[index] = len;
1245  }
1246  }
1247  /* ESC2 */
1248  bits = rl->table_vlc[rl->n][0];
1249  len = rl->table_vlc[rl->n][1];
1250  bits = bits * 4 + 2;
1251  len += 2; // esc2
1252  run1 = run - rl->max_run[last][level] - 1;
1253  if (run1 >= 0) {
1254  code = get_rl_index(rl, last, run1, level);
1255  bits <<= rl->table_vlc[code][1];
1256  len += rl->table_vlc[code][1];
1257  bits += rl->table_vlc[code][0];
1258  bits = bits * 2 + sign;
1259  len++;
1260 
1261  if (code != rl->n && len < len_tab[index]) {
1262  bits_tab[index] = bits;
1263  len_tab[index] = len;
1264  }
1265  }
1266  /* ESC3 */
1267  bits = rl->table_vlc[rl->n][0];
1268  len = rl->table_vlc[rl->n][1];
1269  bits = bits * 4 + 3;
1270  len += 2; // esc3
1271  bits = bits * 2 + last;
1272  len++;
1273  bits = bits * 64 + run;
1274  len += 6;
1275  bits = bits * 2 + 1;
1276  len++; // marker
1277  bits = bits * 4096 + (slevel & 0xfff);
1278  len += 12;
1279  bits = bits * 2 + 1;
1280  len++; // marker
1281 
1282  if (len < len_tab[index]) {
1283  bits_tab[index] = bits;
1284  len_tab[index] = len;
1285  }
1286  }
1287  }
1288  }
1289 }
1290 
1292 {
1293  MpegEncContext *s = avctx->priv_data;
1294  int ret;
1295  static int done = 0;
1296 
1297  if (avctx->width >= (1<<13) || avctx->height >= (1<<13)) {
1298  av_log(avctx, AV_LOG_ERROR, "dimensions too large for MPEG-4\n");
1299  return AVERROR(EINVAL);
1300  }
1301 
1302  if ((ret = ff_MPV_encode_init(avctx)) < 0)
1303  return ret;
1304 
1305  if (!done) {
1306  done = 1;
1307 
1308  init_uni_dc_tab();
1309 
1311 
1314  }
1315 
1316  s->min_qcoeff = -2048;
1317  s->max_qcoeff = 2047;
1323  s->ac_esc_length = 7 + 2 + 1 + 6 + 1 + 12 + 1;
1326 
1327  if (s->flags & CODEC_FLAG_GLOBAL_HEADER) {
1328  s->avctx->extradata = av_malloc(1024);
1329  init_put_bits(&s->pb, s->avctx->extradata, 1024);
1330 
1331  if (!(s->workaround_bugs & FF_BUG_MS))
1333  mpeg4_encode_vol_header(s, 0, 0);
1334 
1335 // ff_mpeg4_stuffing(&s->pb); ?
1336  flush_put_bits(&s->pb);
1337  s->avctx->extradata_size = (put_bits_count(&s->pb) + 7) >> 3;
1338  }
1339  return 0;
1340 }
1341 
1343 {
1344  uint8_t *start = put_bits_ptr(&s->pb);
1345  uint8_t *end = s->pb.buf_end;
1346  int size = end - start;
1347  int pb_size = (((intptr_t)start + size / 3) & (~3)) - (intptr_t)start;
1348  int tex_size = (size - 2 * pb_size) & (~3);
1349 
1350  set_put_bits_buffer_size(&s->pb, pb_size);
1351  init_put_bits(&s->tex_pb, start + pb_size, tex_size);
1352  init_put_bits(&s->pb2, start + pb_size + tex_size, pb_size);
1353 }
1354 
1356 {
1357  const int pb2_len = put_bits_count(&s->pb2);
1358  const int tex_pb_len = put_bits_count(&s->tex_pb);
1359  const int bits = put_bits_count(&s->pb);
1360 
1361  if (s->pict_type == AV_PICTURE_TYPE_I) {
1362  put_bits(&s->pb, 19, DC_MARKER);
1363  s->misc_bits += 19 + pb2_len + bits - s->last_bits;
1364  s->i_tex_bits += tex_pb_len;
1365  } else {
1366  put_bits(&s->pb, 17, MOTION_MARKER);
1367  s->misc_bits += 17 + pb2_len;
1368  s->mv_bits += bits - s->last_bits;
1369  s->p_tex_bits += tex_pb_len;
1370  }
1371 
1372  flush_put_bits(&s->pb2);
1373  flush_put_bits(&s->tex_pb);
1374 
1375  set_put_bits_buffer_size(&s->pb, s->pb2.buf_end - s->pb.buf);
1376  avpriv_copy_bits(&s->pb, s->pb2.buf, pb2_len);
1377  avpriv_copy_bits(&s->pb, s->tex_pb.buf, tex_pb_len);
1378  s->last_bits = put_bits_count(&s->pb);
1379 }
1380 
1382 {
1383  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
1384 
1386  put_bits(&s->pb, 1, 1);
1387 
1388  put_bits(&s->pb, mb_num_bits, s->mb_x + s->mb_y * s->mb_width);
1389  put_bits(&s->pb, s->quant_precision, s->qscale);
1390  put_bits(&s->pb, 1, 0); /* no HEC */
1391 }
1392 
1393 #define OFFSET(x) offsetof(MpegEncContext, x)
1394 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
1395 static const AVOption options[] = {
1396  { "data_partitioning", "Use data partitioning.", OFFSET(data_partitioning), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1397  { "alternate_scan", "Enable alternate scantable.", OFFSET(alternate_scan), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1399  { NULL },
1400 };
1401 
1402 static const AVClass mpeg4enc_class = {
1403  .class_name = "MPEG4 encoder",
1404  .item_name = av_default_item_name,
1405  .option = options,
1406  .version = LIBAVUTIL_VERSION_INT,
1407 };
1408 
1410  .name = "mpeg4",
1411  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
1412  .type = AVMEDIA_TYPE_VIDEO,
1413  .id = AV_CODEC_ID_MPEG4,
1414  .priv_data_size = sizeof(MpegEncContext),
1415  .init = encode_init,
1416  .encode2 = ff_MPV_encode_picture,
1418  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
1419  .capabilities = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1420  .priv_class = &mpeg4enc_class,
1421 };