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mpeg12enc.c
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1 /*
2  * MPEG1/2 encoder
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * Copyright (c) 2002-2004 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 /**
24  * @file
25  * MPEG1/2 encoder
26  */
27 
28 #include <stdint.h>
29 
30 #include "libavutil/attributes.h"
31 #include "libavutil/avassert.h"
32 #include "libavutil/log.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/timecode.h"
35 #include "libavutil/stereo3d.h"
36 
37 #include "avcodec.h"
38 #include "bytestream.h"
39 #include "mathops.h"
40 #include "mpeg12.h"
41 #include "mpeg12data.h"
42 #include "mpegutils.h"
43 #include "mpegvideo.h"
44 
45 
46 static const uint8_t inv_non_linear_qscale[] = {
47  0, 2, 4, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16,
48 };
49 
51  0x10, 0x0E, 0x00, 0x80, 0x81, 0x00, 0x80,
52  0x81, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
53 };
54 
55 static uint8_t mv_penalty[MAX_FCODE + 1][MAX_MV * 2 + 1];
56 static uint8_t fcode_tab[MAX_MV * 2 + 1];
57 
58 static uint8_t uni_mpeg1_ac_vlc_len[64 * 64 * 2];
59 static uint8_t uni_mpeg2_ac_vlc_len[64 * 64 * 2];
60 
61 /* simple include everything table for dc, first byte is bits
62  * number next 3 are code */
63 static uint32_t mpeg1_lum_dc_uni[512];
64 static uint32_t mpeg1_chr_dc_uni[512];
65 
66 static uint8_t mpeg1_index_run[2][64];
67 static int8_t mpeg1_max_level[2][64];
68 
69 static av_cold void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len)
70 {
71  int i;
72 
73  for (i = 0; i < 128; i++) {
74  int level = i - 64;
75  int run;
76  if (!level)
77  continue;
78  for (run = 0; run < 64; run++) {
79  int len, code;
80  int alevel = FFABS(level);
81 
82  if (alevel > rl->max_level[0][run])
83  code = 111; /* rl->n */
84  else
85  code = rl->index_run[0][run] + alevel - 1;
86 
87  if (code < 111) { /* rl->n */
88  /* length of VLC and sign */
89  len = rl->table_vlc[code][1] + 1;
90  } else {
91  len = rl->table_vlc[111 /* rl->n */][1] + 6;
92 
93  if (alevel < 128)
94  len += 8;
95  else
96  len += 16;
97  }
98 
99  uni_ac_vlc_len[UNI_AC_ENC_INDEX(run, i)] = len;
100  }
101  }
102 }
103 
105 {
106  int i;
107  AVRational bestq = (AVRational) {0, 0};
108  AVRational ext;
109  AVRational target = av_inv_q(s->avctx->time_base);
110 
111  for (i = 1; i < 14; i++) {
113  i >= 9)
114  break;
115 
116  for (ext.num=1; ext.num <= 4; ext.num++) {
117  for (ext.den=1; ext.den <= 32; ext.den++) {
119 
120  if (s->codec_id != AV_CODEC_ID_MPEG2VIDEO && (ext.den!=1 || ext.num!=1))
121  continue;
122  if (av_gcd(ext.den, ext.num) != 1)
123  continue;
124 
125  if ( bestq.num==0
126  || av_nearer_q(target, bestq, q) < 0
127  || ext.num==1 && ext.den==1 && av_nearer_q(target, bestq, q) == 0) {
128  bestq = q;
129  s->frame_rate_index = i;
130  s->mpeg2_frame_rate_ext.num = ext.num;
131  s->mpeg2_frame_rate_ext.den = ext.den;
132  }
133  }
134  }
135  }
136 
137  if (av_cmp_q(target, bestq))
138  return -1;
139  else
140  return 0;
141 }
142 
144 {
145  MpegEncContext *s = avctx->priv_data;
146 
147  if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && avctx->height > 2800)
148  avctx->thread_count = 1;
149 
150  if (ff_mpv_encode_init(avctx) < 0)
151  return -1;
152 
153  if (find_frame_rate_index(s) < 0) {
155  av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n",
156  avctx->time_base.den, avctx->time_base.num);
157  return -1;
158  } else {
159  av_log(avctx, AV_LOG_INFO,
160  "MPEG1/2 does not support %d/%d fps, there may be AV sync issues\n",
161  avctx->time_base.den, avctx->time_base.num);
162  }
163  }
164 
165  if (avctx->profile == FF_PROFILE_UNKNOWN) {
166  if (avctx->level != FF_LEVEL_UNKNOWN) {
167  av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
168  return -1;
169  }
170  /* Main or 4:2:2 */
171  avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0;
172  }
173 
174  if (avctx->level == FF_LEVEL_UNKNOWN) {
175  if (avctx->profile == 0) { /* 4:2:2 */
176  if (avctx->width <= 720 && avctx->height <= 608)
177  avctx->level = 5; /* Main */
178  else
179  avctx->level = 2; /* High */
180  } else {
181  if (avctx->profile != 1 && s->chroma_format != CHROMA_420) {
182  av_log(avctx, AV_LOG_ERROR,
183  "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
184  return -1;
185  }
186  if (avctx->width <= 720 && avctx->height <= 576)
187  avctx->level = 8; /* Main */
188  else if (avctx->width <= 1440)
189  avctx->level = 6; /* High 1440 */
190  else
191  avctx->level = 4; /* High */
192  }
193  }
194 
195  if ((avctx->width & 0xFFF) == 0 && (avctx->height & 0xFFF) == 1) {
196  av_log(avctx, AV_LOG_ERROR, "Width / Height is invalid for MPEG2\n");
197  return AVERROR(EINVAL);
198  }
199 
201  if ((avctx->width & 0xFFF) == 0 || (avctx->height & 0xFFF) == 0) {
202  av_log(avctx, AV_LOG_ERROR, "Width or Height are not allowed to be multiples of 4096\n"
203  "add '-strict %d' if you want to use them anyway.\n", FF_COMPLIANCE_UNOFFICIAL);
204  return AVERROR(EINVAL);
205  }
206  }
207 
209  if (s->drop_frame_timecode)
211  if (s->drop_frame_timecode && s->frame_rate_index != 4) {
212  av_log(avctx, AV_LOG_ERROR,
213  "Drop frame time code only allowed with 1001/30000 fps\n");
214  return -1;
215  }
216 
217  if (s->tc_opt_str) {
219  int ret = av_timecode_init_from_string(&s->tc, rate, s->tc_opt_str, s);
220  if (ret < 0)
221  return ret;
224  } else {
225  s->avctx->timecode_frame_start = 0; // default is -1
226  }
227  return 0;
228 }
229 
230 static void put_header(MpegEncContext *s, int header)
231 {
233  put_bits(&s->pb, 16, header >> 16);
234  put_sbits(&s->pb, 16, header);
235 }
236 
237 /* put sequence header if needed */
239 {
240  unsigned int vbv_buffer_size, fps, v;
241  int i, constraint_parameter_flag;
242  uint64_t time_code;
243  int64_t best_aspect_error = INT64_MAX;
244  AVRational aspect_ratio = s->avctx->sample_aspect_ratio;
245 
246  if (aspect_ratio.num == 0 || aspect_ratio.den == 0)
247  aspect_ratio = (AVRational){1,1}; // pixel aspect 1.1 (VGA)
248 
249  if (s->current_picture.f->key_frame) {
251 
252  /* mpeg1 header repeated every gop */
254 
255  put_sbits(&s->pb, 12, s->width & 0xFFF);
256  put_sbits(&s->pb, 12, s->height & 0xFFF);
257 
258  for (i = 1; i < 15; i++) {
259  int64_t error = aspect_ratio.num * (1LL<<32) / aspect_ratio.den;
260  if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO || i <= 1)
261  error -= (1LL<<32) / ff_mpeg1_aspect[i];
262  else
263  error -= (1LL<<32)*ff_mpeg2_aspect[i].num * s->height / s->width / ff_mpeg2_aspect[i].den;
264 
265  error = FFABS(error);
266 
267  if (error - 2 <= best_aspect_error) {
268  best_aspect_error = error;
269  s->aspect_ratio_info = i;
270  }
271  }
272 
273  put_bits(&s->pb, 4, s->aspect_ratio_info);
274  put_bits(&s->pb, 4, s->frame_rate_index);
275 
276  if (s->avctx->rc_max_rate) {
277  v = (s->avctx->rc_max_rate + 399) / 400;
278  if (v > 0x3ffff && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
279  v = 0x3ffff;
280  } else {
281  v = 0x3FFFF;
282  }
283 
284  if (s->avctx->rc_buffer_size)
285  vbv_buffer_size = s->avctx->rc_buffer_size;
286  else
287  /* VBV calculation: Scaled so that a VCD has the proper
288  * VBV size of 40 kilobytes */
289  vbv_buffer_size = ((20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
290  vbv_buffer_size = (vbv_buffer_size + 16383) / 16384;
291 
292  put_sbits(&s->pb, 18, v);
293  put_bits(&s->pb, 1, 1); // marker
294  put_sbits(&s->pb, 10, vbv_buffer_size);
295 
296  constraint_parameter_flag =
297  s->width <= 768 &&
298  s->height <= 576 &&
299  s->mb_width * s->mb_height <= 396 &&
300  s->mb_width * s->mb_height * framerate.num <= 396 * 25 * framerate.den &&
301  framerate.num <= framerate.den * 30 &&
302  s->avctx->me_range &&
303  s->avctx->me_range < 128 &&
304  vbv_buffer_size <= 20 &&
305  v <= 1856000 / 400 &&
307 
308  put_bits(&s->pb, 1, constraint_parameter_flag);
309 
312 
313  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
314  AVFrameSideData *side_data;
315  int width = s->width;
316  int height = s->height;
317  int use_seq_disp_ext;
318 
320  put_bits(&s->pb, 4, 1); // seq ext
321 
322  put_bits(&s->pb, 1, s->avctx->profile == 0); // escx 1 for 4:2:2 profile
323 
324  put_bits(&s->pb, 3, s->avctx->profile); // profile
325  put_bits(&s->pb, 4, s->avctx->level); // level
326 
327  put_bits(&s->pb, 1, s->progressive_sequence);
328  put_bits(&s->pb, 2, s->chroma_format);
329  put_bits(&s->pb, 2, s->width >> 12);
330  put_bits(&s->pb, 2, s->height >> 12);
331  put_bits(&s->pb, 12, v >> 18); // bitrate ext
332  put_bits(&s->pb, 1, 1); // marker
333  put_bits(&s->pb, 8, vbv_buffer_size >> 10); // vbv buffer ext
334  put_bits(&s->pb, 1, s->low_delay);
335  put_bits(&s->pb, 2, s->mpeg2_frame_rate_ext.num-1); // frame_rate_ext_n
336  put_bits(&s->pb, 5, s->mpeg2_frame_rate_ext.den-1); // frame_rate_ext_d
337 
339  if (side_data) {
340  AVPanScan *pan_scan = (AVPanScan *)side_data->data;
341  if (pan_scan->width && pan_scan->height) {
342  width = pan_scan->width >> 4;
343  height = pan_scan->height >> 4;
344  }
345  }
346 
347  use_seq_disp_ext = (width != s->width ||
348  height != s->height ||
352 
353  if (s->seq_disp_ext == 1 || (s->seq_disp_ext == -1 && use_seq_disp_ext)) {
355  put_bits(&s->pb, 4, 2); // sequence display extension
356  put_bits(&s->pb, 3, 0); // video_format: 0 is components
357  put_bits(&s->pb, 1, 1); // colour_description
358  put_bits(&s->pb, 8, s->avctx->color_primaries); // colour_primaries
359  put_bits(&s->pb, 8, s->avctx->color_trc); // transfer_characteristics
360  put_bits(&s->pb, 8, s->avctx->colorspace); // matrix_coefficients
361  put_bits(&s->pb, 14, width); // display_horizontal_size
362  put_bits(&s->pb, 1, 1); // marker_bit
363  put_bits(&s->pb, 14, height); // display_vertical_size
364  put_bits(&s->pb, 3, 0); // remaining 3 bits are zero padding
365  }
366  }
367 
369  put_bits(&s->pb, 1, s->drop_frame_timecode); // drop frame flag
370  /* time code: we must convert from the real frame rate to a
371  * fake MPEG frame rate in case of low frame rate */
372  fps = (framerate.num + framerate.den / 2) / framerate.den;
373  time_code = s->current_picture_ptr->f->coded_picture_number +
375 
377 
379  if (s->drop_frame_timecode)
380  time_code = av_timecode_adjust_ntsc_framenum2(time_code, fps);
381 
382  put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
383  put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
384  put_bits(&s->pb, 1, 1);
385  put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
386  put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
387  put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP) || s->intra_only || !s->gop_picture_number);
388  put_bits(&s->pb, 1, 0); // broken link
389  }
390 }
391 
392 static inline void encode_mb_skip_run(MpegEncContext *s, int run)
393 {
394  while (run >= 33) {
395  put_bits(&s->pb, 11, 0x008);
396  run -= 33;
397  }
399  ff_mpeg12_mbAddrIncrTable[run][0]);
400 }
401 
403 {
404  if (s->q_scale_type) {
405  av_assert2(s->qscale >= 1 && s->qscale <= 12);
407  } else {
408  put_bits(&s->pb, 5, s->qscale);
409  }
410 }
411 
413 {
414  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->height > 2800) {
415  put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
416  /* slice_vertical_position_extension */
417  put_bits(&s->pb, 3, s->mb_y >> 7);
418  } else {
420  }
421  put_qscale(s);
422  /* slice extra information */
423  put_bits(&s->pb, 1, 0);
424 }
425 
427 {
428  AVFrameSideData *side_data;
430 
431  /* mpeg1 picture header */
433  /* temporal reference */
434 
435  // RAL: s->picture_number instead of s->fake_picture_number
436  put_bits(&s->pb, 10,
437  (s->picture_number - s->gop_picture_number) & 0x3ff);
438  put_bits(&s->pb, 3, s->pict_type);
439 
440  s->vbv_delay_ptr = s->pb.buf + put_bits_count(&s->pb) / 8;
441  put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
442 
443  // RAL: Forward f_code also needed for B-frames
444  if (s->pict_type == AV_PICTURE_TYPE_P ||
446  put_bits(&s->pb, 1, 0); /* half pel coordinates */
448  put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
449  else
450  put_bits(&s->pb, 3, 7); /* forward_f_code */
451  }
452 
453  // RAL: Backward f_code necessary for B-frames
454  if (s->pict_type == AV_PICTURE_TYPE_B) {
455  put_bits(&s->pb, 1, 0); /* half pel coordinates */
457  put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
458  else
459  put_bits(&s->pb, 3, 7); /* backward_f_code */
460  }
461 
462  put_bits(&s->pb, 1, 0); /* extra bit picture */
463 
464  s->frame_pred_frame_dct = 1;
465  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
467  put_bits(&s->pb, 4, 8); /* pic ext */
468  if (s->pict_type == AV_PICTURE_TYPE_P ||
470  put_bits(&s->pb, 4, s->f_code);
471  put_bits(&s->pb, 4, s->f_code);
472  } else {
473  put_bits(&s->pb, 8, 255);
474  }
475  if (s->pict_type == AV_PICTURE_TYPE_B) {
476  put_bits(&s->pb, 4, s->b_code);
477  put_bits(&s->pb, 4, s->b_code);
478  } else {
479  put_bits(&s->pb, 8, 255);
480  }
481  put_bits(&s->pb, 2, s->intra_dc_precision);
482 
484  put_bits(&s->pb, 2, s->picture_structure);
485  if (s->progressive_sequence)
486  put_bits(&s->pb, 1, 0); /* no repeat */
487  else
489  /* XXX: optimize the generation of this flag with entropy measures */
491 
492  put_bits(&s->pb, 1, s->frame_pred_frame_dct);
494  put_bits(&s->pb, 1, s->q_scale_type);
495  put_bits(&s->pb, 1, s->intra_vlc_format);
496  put_bits(&s->pb, 1, s->alternate_scan);
497  put_bits(&s->pb, 1, s->repeat_first_field);
499  /* chroma_420_type */
500  put_bits(&s->pb, 1, s->chroma_format ==
501  CHROMA_420 ? s->progressive_frame : 0);
502  put_bits(&s->pb, 1, s->progressive_frame);
503  put_bits(&s->pb, 1, 0); /* composite_display_flag */
504  }
505  if (s->scan_offset) {
506  int i;
507 
509  for (i = 0; i < sizeof(svcd_scan_offset_placeholder); i++)
511  }
514  if (side_data) {
515  AVStereo3D *stereo = (AVStereo3D *)side_data->data;
516  uint8_t fpa_type;
517 
518  switch (stereo->type) {
520  fpa_type = 0x03;
521  break;
523  fpa_type = 0x04;
524  break;
525  case AV_STEREO3D_2D:
526  fpa_type = 0x08;
527  break;
529  fpa_type = 0x23;
530  break;
531  default:
532  fpa_type = 0;
533  break;
534  }
535 
536  if (fpa_type != 0) {
538  put_bits(&s->pb, 8, 'J'); // S3D_video_format_signaling_identifier
539  put_bits(&s->pb, 8, 'P');
540  put_bits(&s->pb, 8, '3');
541  put_bits(&s->pb, 8, 'D');
542  put_bits(&s->pb, 8, 0x03); // S3D_video_format_length
543 
544  put_bits(&s->pb, 1, 1); // reserved_bit
545  put_bits(&s->pb, 7, fpa_type); // S3D_video_format_type
546  put_bits(&s->pb, 8, 0x04); // reserved_data[0]
547  put_bits(&s->pb, 8, 0xFF); // reserved_data[1]
548  }
549  }
550 
551  s->mb_y = 0;
553 }
554 
555 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
556  int has_mv, int field_motion)
557 {
558  put_bits(&s->pb, n, bits);
559  if (!s->frame_pred_frame_dct) {
560  if (has_mv)
561  /* motion_type: frame/field */
562  put_bits(&s->pb, 2, 2 - field_motion);
563  put_bits(&s->pb, 1, s->interlaced_dct);
564  }
565 }
566 
567 // RAL: Parameter added: f_or_b_code
568 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
569 {
570  if (val == 0) {
571  /* zero vector */
572  put_bits(&s->pb,
575  } else {
576  int code, sign, bits;
577  int bit_size = f_or_b_code - 1;
578  int range = 1 << bit_size;
579  /* modulo encoding */
580  val = sign_extend(val, 5 + bit_size);
581 
582  if (val >= 0) {
583  val--;
584  code = (val >> bit_size) + 1;
585  bits = val & (range - 1);
586  sign = 0;
587  } else {
588  val = -val;
589  val--;
590  code = (val >> bit_size) + 1;
591  bits = val & (range - 1);
592  sign = 1;
593  }
594 
595  av_assert2(code > 0 && code <= 16);
596 
597  put_bits(&s->pb,
600 
601  put_bits(&s->pb, 1, sign);
602  if (bit_size > 0)
603  put_bits(&s->pb, bit_size, bits);
604  }
605 }
606 
607 static inline void encode_dc(MpegEncContext *s, int diff, int component)
608 {
609  unsigned int diff_u = diff + 255;
610  if (diff_u >= 511) {
611  int index;
612 
613  if (diff < 0) {
614  index = av_log2_16bit(-2 * diff);
615  diff--;
616  } else {
617  index = av_log2_16bit(2 * diff);
618  }
619  if (component == 0)
620  put_bits(&s->pb,
621  ff_mpeg12_vlc_dc_lum_bits[index] + index,
622  (ff_mpeg12_vlc_dc_lum_code[index] << index) +
623  (diff & ((1 << index) - 1)));
624  else
625  put_bits(&s->pb,
626  ff_mpeg12_vlc_dc_chroma_bits[index] + index,
627  (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
628  (diff & ((1 << index) - 1)));
629  } else {
630  if (component == 0)
631  put_bits(&s->pb,
632  mpeg1_lum_dc_uni[diff + 255] & 0xFF,
633  mpeg1_lum_dc_uni[diff + 255] >> 8);
634  else
635  put_bits(&s->pb,
636  mpeg1_chr_dc_uni[diff + 255] & 0xFF,
637  mpeg1_chr_dc_uni[diff + 255] >> 8);
638  }
639 }
640 
641 static void mpeg1_encode_block(MpegEncContext *s, int16_t *block, int n)
642 {
643  int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
644  int code, component;
645  const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
646 
647  last_index = s->block_last_index[n];
648 
649  /* DC coef */
650  if (s->mb_intra) {
651  component = (n <= 3 ? 0 : (n & 1) + 1);
652  dc = block[0]; /* overflow is impossible */
653  diff = dc - s->last_dc[component];
654  encode_dc(s, diff, component);
655  s->last_dc[component] = dc;
656  i = 1;
657  if (s->intra_vlc_format)
658  table_vlc = ff_rl_mpeg2.table_vlc;
659  } else {
660  /* encode the first coefficient: needs to be done here because
661  * it is handled slightly differently */
662  level = block[0];
663  if (abs(level) == 1) {
664  code = ((uint32_t)level >> 31); /* the sign bit */
665  put_bits(&s->pb, 2, code | 0x02);
666  i = 1;
667  } else {
668  i = 0;
669  last_non_zero = -1;
670  goto next_coef;
671  }
672  }
673 
674  /* now quantify & encode AC coefs */
675  last_non_zero = i - 1;
676 
677  for (; i <= last_index; i++) {
678  j = s->intra_scantable.permutated[i];
679  level = block[j];
680 
681 next_coef:
682  /* encode using VLC */
683  if (level != 0) {
684  run = i - last_non_zero - 1;
685 
686  alevel = level;
687  MASK_ABS(sign, alevel);
688  sign &= 1;
689 
690  if (alevel <= mpeg1_max_level[0][run]) {
691  code = mpeg1_index_run[0][run] + alevel - 1;
692  /* store the VLC & sign at once */
693  put_bits(&s->pb, table_vlc[code][1] + 1,
694  (table_vlc[code][0] << 1) + sign);
695  } else {
696  /* escape seems to be pretty rare <5% so I do not optimize it */
697  put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
698  /* escape: only clip in this case */
699  put_bits(&s->pb, 6, run);
700  if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
701  if (alevel < 128) {
702  put_sbits(&s->pb, 8, level);
703  } else {
704  if (level < 0)
705  put_bits(&s->pb, 16, 0x8001 + level + 255);
706  else
707  put_sbits(&s->pb, 16, level);
708  }
709  } else {
710  put_sbits(&s->pb, 12, level);
711  }
712  }
713  last_non_zero = i;
714  }
715  }
716  /* end of block */
717  put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
718 }
719 
721  int16_t block[8][64],
722  int motion_x, int motion_y,
723  int mb_block_count)
724 {
725  int i, cbp;
726  const int mb_x = s->mb_x;
727  const int mb_y = s->mb_y;
728  const int first_mb = mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
729 
730  /* compute cbp */
731  cbp = 0;
732  for (i = 0; i < mb_block_count; i++)
733  if (s->block_last_index[i] >= 0)
734  cbp |= 1 << (mb_block_count - 1 - i);
735 
736  if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
737  (mb_x != s->mb_width - 1 ||
738  (mb_y != s->end_mb_y - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&
739  ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
740  (s->pict_type == AV_PICTURE_TYPE_B && s->mv_dir == s->last_mv_dir &&
741  (((s->mv_dir & MV_DIR_FORWARD)
742  ? ((s->mv[0][0][0] - s->last_mv[0][0][0]) |
743  (s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
744  ((s->mv_dir & MV_DIR_BACKWARD)
745  ? ((s->mv[1][0][0] - s->last_mv[1][0][0]) |
746  (s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
747  s->mb_skip_run++;
748  s->qscale -= s->dquant;
749  s->skip_count++;
750  s->misc_bits++;
751  s->last_bits++;
752  if (s->pict_type == AV_PICTURE_TYPE_P) {
753  s->last_mv[0][0][0] =
754  s->last_mv[0][0][1] =
755  s->last_mv[0][1][0] =
756  s->last_mv[0][1][1] = 0;
757  }
758  } else {
759  if (first_mb) {
760  av_assert0(s->mb_skip_run == 0);
761  encode_mb_skip_run(s, s->mb_x);
762  } else {
764  }
765 
766  if (s->pict_type == AV_PICTURE_TYPE_I) {
767  if (s->dquant && cbp) {
768  /* macroblock_type: macroblock_quant = 1 */
769  put_mb_modes(s, 2, 1, 0, 0);
770  put_qscale(s);
771  } else {
772  /* macroblock_type: macroblock_quant = 0 */
773  put_mb_modes(s, 1, 1, 0, 0);
774  s->qscale -= s->dquant;
775  }
776  s->misc_bits += get_bits_diff(s);
777  s->i_count++;
778  } else if (s->mb_intra) {
779  if (s->dquant && cbp) {
780  put_mb_modes(s, 6, 0x01, 0, 0);
781  put_qscale(s);
782  } else {
783  put_mb_modes(s, 5, 0x03, 0, 0);
784  s->qscale -= s->dquant;
785  }
786  s->misc_bits += get_bits_diff(s);
787  s->i_count++;
788  memset(s->last_mv, 0, sizeof(s->last_mv));
789  } else if (s->pict_type == AV_PICTURE_TYPE_P) {
790  if (s->mv_type == MV_TYPE_16X16) {
791  if (cbp != 0) {
792  if ((motion_x | motion_y) == 0) {
793  if (s->dquant) {
794  /* macroblock_pattern & quant */
795  put_mb_modes(s, 5, 1, 0, 0);
796  put_qscale(s);
797  } else {
798  /* macroblock_pattern only */
799  put_mb_modes(s, 2, 1, 0, 0);
800  }
801  s->misc_bits += get_bits_diff(s);
802  } else {
803  if (s->dquant) {
804  put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
805  put_qscale(s);
806  } else {
807  put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
808  }
809  s->misc_bits += get_bits_diff(s);
810  // RAL: f_code parameter added
812  motion_x - s->last_mv[0][0][0],
813  s->f_code);
814  // RAL: f_code parameter added
816  motion_y - s->last_mv[0][0][1],
817  s->f_code);
818  s->mv_bits += get_bits_diff(s);
819  }
820  } else {
821  put_bits(&s->pb, 3, 1); /* motion only */
822  if (!s->frame_pred_frame_dct)
823  put_bits(&s->pb, 2, 2); /* motion_type: frame */
824  s->misc_bits += get_bits_diff(s);
825  // RAL: f_code parameter added
827  motion_x - s->last_mv[0][0][0],
828  s->f_code);
829  // RAL: f_code parameter added
831  motion_y - s->last_mv[0][0][1],
832  s->f_code);
833  s->qscale -= s->dquant;
834  s->mv_bits += get_bits_diff(s);
835  }
836  s->last_mv[0][1][0] = s->last_mv[0][0][0] = motion_x;
837  s->last_mv[0][1][1] = s->last_mv[0][0][1] = motion_y;
838  } else {
840 
841  if (cbp) {
842  if (s->dquant) {
843  put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
844  put_qscale(s);
845  } else {
846  put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
847  }
848  } else {
849  put_bits(&s->pb, 3, 1); /* motion only */
850  put_bits(&s->pb, 2, 1); /* motion_type: field */
851  s->qscale -= s->dquant;
852  }
853  s->misc_bits += get_bits_diff(s);
854  for (i = 0; i < 2; i++) {
855  put_bits(&s->pb, 1, s->field_select[0][i]);
857  s->mv[0][i][0] - s->last_mv[0][i][0],
858  s->f_code);
860  s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
861  s->f_code);
862  s->last_mv[0][i][0] = s->mv[0][i][0];
863  s->last_mv[0][i][1] = 2 * s->mv[0][i][1];
864  }
865  s->mv_bits += get_bits_diff(s);
866  }
867  if (cbp) {
868  if (s->chroma_y_shift) {
869  put_bits(&s->pb,
870  ff_mpeg12_mbPatTable[cbp][1],
871  ff_mpeg12_mbPatTable[cbp][0]);
872  } else {
873  put_bits(&s->pb,
874  ff_mpeg12_mbPatTable[cbp >> 2][1],
875  ff_mpeg12_mbPatTable[cbp >> 2][0]);
876  put_sbits(&s->pb, 2, cbp);
877  }
878  }
879  s->f_count++;
880  } else {
881  if (s->mv_type == MV_TYPE_16X16) {
882  if (cbp) { // With coded bloc pattern
883  if (s->dquant) {
884  if (s->mv_dir == MV_DIR_FORWARD)
885  put_mb_modes(s, 6, 3, 1, 0);
886  else
887  put_mb_modes(s, 8 - s->mv_dir, 2, 1, 0);
888  put_qscale(s);
889  } else {
890  put_mb_modes(s, 5 - s->mv_dir, 3, 1, 0);
891  }
892  } else { // No coded bloc pattern
893  put_bits(&s->pb, 5 - s->mv_dir, 2);
894  if (!s->frame_pred_frame_dct)
895  put_bits(&s->pb, 2, 2); /* motion_type: frame */
896  s->qscale -= s->dquant;
897  }
898  s->misc_bits += get_bits_diff(s);
899  if (s->mv_dir & MV_DIR_FORWARD) {
901  s->mv[0][0][0] - s->last_mv[0][0][0],
902  s->f_code);
904  s->mv[0][0][1] - s->last_mv[0][0][1],
905  s->f_code);
906  s->last_mv[0][0][0] =
907  s->last_mv[0][1][0] = s->mv[0][0][0];
908  s->last_mv[0][0][1] =
909  s->last_mv[0][1][1] = s->mv[0][0][1];
910  s->f_count++;
911  }
912  if (s->mv_dir & MV_DIR_BACKWARD) {
914  s->mv[1][0][0] - s->last_mv[1][0][0],
915  s->b_code);
917  s->mv[1][0][1] - s->last_mv[1][0][1],
918  s->b_code);
919  s->last_mv[1][0][0] =
920  s->last_mv[1][1][0] = s->mv[1][0][0];
921  s->last_mv[1][0][1] =
922  s->last_mv[1][1][1] = s->mv[1][0][1];
923  s->b_count++;
924  }
925  } else {
928  if (cbp) { // With coded bloc pattern
929  if (s->dquant) {
930  if (s->mv_dir == MV_DIR_FORWARD)
931  put_mb_modes(s, 6, 3, 1, 1);
932  else
933  put_mb_modes(s, 8 - s->mv_dir, 2, 1, 1);
934  put_qscale(s);
935  } else {
936  put_mb_modes(s, 5 - s->mv_dir, 3, 1, 1);
937  }
938  } else { // No coded bloc pattern
939  put_bits(&s->pb, 5 - s->mv_dir, 2);
940  put_bits(&s->pb, 2, 1); /* motion_type: field */
941  s->qscale -= s->dquant;
942  }
943  s->misc_bits += get_bits_diff(s);
944  if (s->mv_dir & MV_DIR_FORWARD) {
945  for (i = 0; i < 2; i++) {
946  put_bits(&s->pb, 1, s->field_select[0][i]);
948  s->mv[0][i][0] - s->last_mv[0][i][0],
949  s->f_code);
951  s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
952  s->f_code);
953  s->last_mv[0][i][0] = s->mv[0][i][0];
954  s->last_mv[0][i][1] = s->mv[0][i][1] * 2;
955  }
956  s->f_count++;
957  }
958  if (s->mv_dir & MV_DIR_BACKWARD) {
959  for (i = 0; i < 2; i++) {
960  put_bits(&s->pb, 1, s->field_select[1][i]);
962  s->mv[1][i][0] - s->last_mv[1][i][0],
963  s->b_code);
965  s->mv[1][i][1] - (s->last_mv[1][i][1] >> 1),
966  s->b_code);
967  s->last_mv[1][i][0] = s->mv[1][i][0];
968  s->last_mv[1][i][1] = s->mv[1][i][1] * 2;
969  }
970  s->b_count++;
971  }
972  }
973  s->mv_bits += get_bits_diff(s);
974  if (cbp) {
975  if (s->chroma_y_shift) {
976  put_bits(&s->pb,
977  ff_mpeg12_mbPatTable[cbp][1],
978  ff_mpeg12_mbPatTable[cbp][0]);
979  } else {
980  put_bits(&s->pb,
981  ff_mpeg12_mbPatTable[cbp >> 2][1],
982  ff_mpeg12_mbPatTable[cbp >> 2][0]);
983  put_sbits(&s->pb, 2, cbp);
984  }
985  }
986  }
987  for (i = 0; i < mb_block_count; i++)
988  if (cbp & (1 << (mb_block_count - 1 - i)))
989  mpeg1_encode_block(s, block[i], i);
990  s->mb_skip_run = 0;
991  if (s->mb_intra)
992  s->i_tex_bits += get_bits_diff(s);
993  else
994  s->p_tex_bits += get_bits_diff(s);
995  }
996 }
997 
998 void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64],
999  int motion_x, int motion_y)
1000 {
1001  if (s->chroma_format == CHROMA_420)
1002  mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
1003  else
1004  mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
1005 }
1006 
1008 {
1009  static int done = 0;
1010 
1012 
1013  if (!done) {
1014  int f_code;
1015  int mv;
1016  int i;
1017 
1018  done = 1;
1021 
1022  for (i = 0; i < 64; i++) {
1023  mpeg1_max_level[0][i] = ff_rl_mpeg1.max_level[0][i];
1024  mpeg1_index_run[0][i] = ff_rl_mpeg1.index_run[0][i];
1025  }
1026 
1028  if (s->intra_vlc_format)
1030 
1031  /* build unified dc encoding tables */
1032  for (i = -255; i < 256; i++) {
1033  int adiff, index;
1034  int bits, code;
1035  int diff = i;
1036 
1037  adiff = FFABS(diff);
1038  if (diff < 0)
1039  diff--;
1040  index = av_log2(2 * adiff);
1041 
1043  code = (ff_mpeg12_vlc_dc_lum_code[index] << index) +
1044  (diff & ((1 << index) - 1));
1045  mpeg1_lum_dc_uni[i + 255] = bits + (code << 8);
1046 
1049  (diff & ((1 << index) - 1));
1050  mpeg1_chr_dc_uni[i + 255] = bits + (code << 8);
1051  }
1052 
1053  for (f_code = 1; f_code <= MAX_FCODE; f_code++)
1054  for (mv = -MAX_MV; mv <= MAX_MV; mv++) {
1055  int len;
1056 
1057  if (mv == 0) {
1058  len = ff_mpeg12_mbMotionVectorTable[0][1];
1059  } else {
1060  int val, bit_size, code;
1061 
1062  bit_size = f_code - 1;
1063 
1064  val = mv;
1065  if (val < 0)
1066  val = -val;
1067  val--;
1068  code = (val >> bit_size) + 1;
1069  if (code < 17)
1070  len = ff_mpeg12_mbMotionVectorTable[code][1] +
1071  1 + bit_size;
1072  else
1073  len = ff_mpeg12_mbMotionVectorTable[16][1] +
1074  2 + bit_size;
1075  }
1076 
1077  mv_penalty[f_code][mv + MAX_MV] = len;
1078  }
1079 
1080 
1081  for (f_code = MAX_FCODE; f_code > 0; f_code--)
1082  for (mv = -(8 << f_code); mv < (8 << f_code); mv++)
1083  fcode_tab[mv + MAX_MV] = f_code;
1084  }
1085  s->me.mv_penalty = mv_penalty;
1086  s->fcode_tab = fcode_tab;
1087  if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1088  s->min_qcoeff = -255;
1089  s->max_qcoeff = 255;
1090  } else {
1091  s->min_qcoeff = -2047;
1092  s->max_qcoeff = 2047;
1093  }
1094  if (s->intra_vlc_format) {
1095  s->intra_ac_vlc_length =
1097  } else {
1098  s->intra_ac_vlc_length =
1100  }
1101  s->inter_ac_vlc_length =
1103 }
1104 
1105 #define OFFSET(x) offsetof(MpegEncContext, x)
1106 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
1107 #define COMMON_OPTS \
1108  { "gop_timecode", "MPEG GOP Timecode in hh:mm:ss[:;.]ff format", \
1109  OFFSET(tc_opt_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, VE },\
1110  { "intra_vlc", "Use MPEG-2 intra VLC table.", \
1111  OFFSET(intra_vlc_format), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE }, \
1112  { "drop_frame_timecode", "Timecode is in drop frame format.", \
1113  OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE }, \
1114  { "scan_offset", "Reserve space for SVCD scan offset user data.", \
1115  OFFSET(scan_offset), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1116 
1117 static const AVOption mpeg1_options[] = {
1118  COMMON_OPTS
1120  { NULL },
1121 };
1122 
1123 static const AVOption mpeg2_options[] = {
1124  COMMON_OPTS
1125  { "non_linear_quant", "Use nonlinear quantizer.", OFFSET(q_scale_type), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1126  { "alternate_scan", "Enable alternate scantable.", OFFSET(alternate_scan), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1127  { "seq_disp_ext", "Write sequence_display_extension blocks.", OFFSET(seq_disp_ext), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE, "seq_disp_ext" },
1128  { "auto", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = -1}, 0, 0, VE, "seq_disp_ext" },
1129  { "never", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 0, VE, "seq_disp_ext" },
1130  { "always", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, VE, "seq_disp_ext" },
1132  { NULL },
1133 };
1134 
1135 #define mpeg12_class(x) \
1136 static const AVClass mpeg ## x ## _class = { \
1137  .class_name = "mpeg" # x "video encoder", \
1138  .item_name = av_default_item_name, \
1139  .option = mpeg ## x ## _options, \
1140  .version = LIBAVUTIL_VERSION_INT, \
1141 };
1142 
1144 mpeg12_class(2)
1145 
1146 AVCodec ff_mpeg1video_encoder = {
1147  .name = "mpeg1video",
1148  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
1149  .type = AVMEDIA_TYPE_VIDEO,
1150  .id = AV_CODEC_ID_MPEG1VIDEO,
1151  .priv_data_size = sizeof(MpegEncContext),
1152  .init = encode_init,
1153  .encode2 = ff_mpv_encode_picture,
1154  .close = ff_mpv_encode_end,
1155  .supported_framerates = ff_mpeg12_frame_rate_tab + 1,
1156  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1157  AV_PIX_FMT_NONE },
1158  .capabilities = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1159  .priv_class = &mpeg1_class,
1160 };
1161 
1163  .name = "mpeg2video",
1164  .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
1165  .type = AVMEDIA_TYPE_VIDEO,
1166  .id = AV_CODEC_ID_MPEG2VIDEO,
1167  .priv_data_size = sizeof(MpegEncContext),
1168  .init = encode_init,
1169  .encode2 = ff_mpv_encode_picture,
1170  .close = ff_mpv_encode_end,
1171  .supported_framerates = ff_mpeg2_frame_rate_tab,
1172  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1174  AV_PIX_FMT_NONE },
1175  .capabilities = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1176  .priv_class = &mpeg2_class,
1177 };