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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 "avcodec.h"
29 #include "dsputil.h"
30 #include "mathops.h"
31 #include "mpegvideo.h"
32 
33 #include "mpeg12.h"
34 #include "mpeg12data.h"
35 #include "bytestream.h"
36 #include "libavutil/log.h"
37 #include "libavutil/opt.h"
38 #include "libavutil/avassert.h"
39 #include "libavutil/timecode.h"
40 
41 static const uint8_t inv_non_linear_qscale[13] = {
42  0, 2, 4, 6, 8,
43  9,10,11,12,13,14,15,16,
44 };
45 
46 static const uint8_t svcd_scan_offset_placeholder[14] = {
47  0x10, 0x0E,
48  0x00, 0x80, 0x81,
49  0x00, 0x80, 0x81,
50  0xff, 0xff, 0xff,
51  0xff, 0xff, 0xff,
52 };
53 
54 static void mpeg1_encode_block(MpegEncContext *s,
55  DCTELEM *block,
56  int component);
57 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code); // RAL: f_code parameter added
58 
59 static uint8_t mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
60 static uint8_t fcode_tab[MAX_MV*2+1];
61 
62 static uint8_t uni_mpeg1_ac_vlc_len [64*64*2];
63 static uint8_t uni_mpeg2_ac_vlc_len [64*64*2];
64 
65 /* simple include everything table for dc, first byte is bits number next 3 are code*/
66 static uint32_t mpeg1_lum_dc_uni[512];
67 static uint32_t mpeg1_chr_dc_uni[512];
68 
69 static uint8_t mpeg1_index_run[2][64];
70 static int8_t mpeg1_max_level[2][64];
71 
72 static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
73  int i;
74 
75  for(i=0; i<128; i++){
76  int level= i-64;
77  int run;
78  if (!level)
79  continue;
80  for(run=0; run<64; run++){
81  int len, code;
82 
83  int alevel= FFABS(level);
84 
85  if (alevel > rl->max_level[0][run])
86  code= 111; /*rl->n*/
87  else
88  code= rl->index_run[0][run] + alevel - 1;
89 
90  if (code < 111 /* rl->n */) {
91  /* length of vlc and sign */
92  len= rl->table_vlc[code][1]+1;
93  } else {
94  len= rl->table_vlc[111/*rl->n*/][1]+6;
95 
96  if (alevel < 128) {
97  len += 8;
98  } else {
99  len += 16;
100  }
101  }
102 
103  uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
104  }
105  }
106 }
107 
108 
109 static int find_frame_rate_index(MpegEncContext *s){
110  int i;
111  AVRational bestq= (AVRational){0, 0};
112  AVRational ext;
113  AVRational target = av_inv_q(s->avctx->time_base);
114 
115  for(i=1;i<14;i++) {
116  if(s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL && i>=9) break;
117 
118  for (ext.num=1; ext.num <= 4; ext.num++) {
119  for (ext.den=1; ext.den <= 32; ext.den++) {
120  AVRational q = av_mul_q(ext, ff_mpeg12_frame_rate_tab[i]);
121 
122  if(s->codec_id != AV_CODEC_ID_MPEG2VIDEO && (ext.den!=1 || ext.num!=1))
123  continue;
124  if(av_gcd(ext.den, ext.num) != 1)
125  continue;
126 
127  if( bestq.num==0
128  || av_nearer_q(target, bestq, q) < 0
129  || ext.num==1 && ext.den==1 && av_nearer_q(target, bestq, q) == 0){
130  bestq = q;
131  s->frame_rate_index= i;
132  s->mpeg2_frame_rate_ext.num = ext.num;
133  s->mpeg2_frame_rate_ext.den = ext.den;
134  }
135  }
136  }
137  }
138  if(av_cmp_q(target, bestq))
139  return -1;
140  else
141  return 0;
142 }
143 
144 static av_cold int encode_init(AVCodecContext *avctx)
145 {
146  MpegEncContext *s = avctx->priv_data;
147 
148  if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && avctx->height > 2800)
149  avctx->thread_count = 1;
150 
151  if(ff_MPV_encode_init(avctx) < 0)
152  return -1;
153 
154  if(find_frame_rate_index(s) < 0){
155  if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
156  av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
157  return -1;
158  }else{
159  av_log(avctx, AV_LOG_INFO, "MPEG1/2 does not support %d/%d fps, there may be AV sync issues\n", avctx->time_base.den, avctx->time_base.num);
160  }
161  }
162 
163  if(avctx->profile == FF_PROFILE_UNKNOWN){
164  if(avctx->level != FF_LEVEL_UNKNOWN){
165  av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
166  return -1;
167  }
168  avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
169  }
170 
171  if(avctx->level == FF_LEVEL_UNKNOWN){
172  if(avctx->profile == 0){ /* 4:2:2 */
173  if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
174  else avctx->level = 2; /* High */
175  }else{
176  if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
177  av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
178  return -1;
179  }
180  if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
181  else if(avctx->width <= 1440) avctx->level = 6; /* High 1440 */
182  else avctx->level = 4; /* High */
183  }
184  }
185 
186  if ((avctx->width & 0xFFF) == 0 && (avctx->height & 0xFFF) == 1) {
187  av_log(avctx, AV_LOG_ERROR, "Width / Height is invalid for MPEG2\n");
188  return AVERROR(EINVAL);
189  }
190 
191  if (s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
192  if ((avctx->width & 0xFFF) == 0 || (avctx->height & 0xFFF) == 0) {
193  av_log(avctx, AV_LOG_ERROR, "Width or Height are not allowed to be multiplies of 4096\n"
194  "add '-strict %d' if you want to use them anyway.\n", FF_COMPLIANCE_UNOFFICIAL);
195  return AVERROR(EINVAL);
196  }
197  }
198 
199  s->drop_frame_timecode = s->drop_frame_timecode || !!(avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE);
200  if (s->drop_frame_timecode)
201  s->tc.flags |= AV_TIMECODE_FLAG_DROPFRAME;
202  if (s->drop_frame_timecode && s->frame_rate_index != 4) {
203  av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
204  return -1;
205  }
206 
207  if (s->tc_opt_str) {
208  AVRational rate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
209  int ret = av_timecode_init_from_string(&s->tc, rate, s->tc_opt_str, s);
210  if (ret < 0)
211  return ret;
212  s->drop_frame_timecode = !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME);
213  s->avctx->timecode_frame_start = s->tc.start;
214  } else {
215  s->avctx->timecode_frame_start = 0; // default is -1
216  }
217  return 0;
218 }
219 
220 static void put_header(MpegEncContext *s, int header)
221 {
222  avpriv_align_put_bits(&s->pb);
223  put_bits(&s->pb, 16, header>>16);
224  put_sbits(&s->pb, 16, header);
225 }
226 
227 /* put sequence header if needed */
228 static void mpeg1_encode_sequence_header(MpegEncContext *s)
229 {
230  unsigned int vbv_buffer_size;
231  unsigned int fps, v;
232  int i;
233  uint64_t time_code;
234  float best_aspect_error= 1E10;
235  float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
236  int constraint_parameter_flag;
237 
238  if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
239 
240  if (s->current_picture.f.key_frame) {
241  AVRational framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
242 
243  /* mpeg1 header repeated every gop */
244  put_header(s, SEQ_START_CODE);
245 
246  put_sbits(&s->pb, 12, s->width & 0xFFF);
247  put_sbits(&s->pb, 12, s->height & 0xFFF);
248 
249  for(i=1; i<15; i++){
250  float error= aspect_ratio;
251  if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO || i <=1)
252  error-= 1.0/ff_mpeg1_aspect[i];
253  else
254  error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
255 
256  error= FFABS(error);
257 
258  if(error < best_aspect_error){
259  best_aspect_error= error;
260  s->aspect_ratio_info= i;
261  }
262  }
263 
264  put_bits(&s->pb, 4, s->aspect_ratio_info);
265  put_bits(&s->pb, 4, s->frame_rate_index);
266 
267  if(s->avctx->rc_max_rate){
268  v = (s->avctx->rc_max_rate + 399) / 400;
269  if (v > 0x3ffff && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
270  v = 0x3ffff;
271  }else{
272  v= 0x3FFFF;
273  }
274 
275  if(s->avctx->rc_buffer_size)
276  vbv_buffer_size = s->avctx->rc_buffer_size;
277  else
278  /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
279  vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
280  vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
281 
282  put_sbits(&s->pb, 18, v);
283  put_bits(&s->pb, 1, 1); /* marker */
284  put_sbits(&s->pb, 10, vbv_buffer_size);
285 
286  constraint_parameter_flag=
287  s->width <= 768 && s->height <= 576 &&
288  s->mb_width * s->mb_height <= 396 &&
289  s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
290  framerate.num <= framerate.den*30 &&
291  s->avctx->me_range && s->avctx->me_range < 128 &&
292  vbv_buffer_size <= 20 &&
293  v <= 1856000/400 &&
294  s->codec_id == AV_CODEC_ID_MPEG1VIDEO;
295 
296  put_bits(&s->pb, 1, constraint_parameter_flag);
297 
298  ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
299  ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
300 
301  if(s->codec_id == AV_CODEC_ID_MPEG2VIDEO){
302  put_header(s, EXT_START_CODE);
303  put_bits(&s->pb, 4, 1); //seq ext
304 
305  put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
306 
307  put_bits(&s->pb, 3, s->avctx->profile); //profile
308  put_bits(&s->pb, 4, s->avctx->level); //level
309 
310  put_bits(&s->pb, 1, s->progressive_sequence);
311  put_bits(&s->pb, 2, s->chroma_format);
312  put_bits(&s->pb, 2, s->width >>12);
313  put_bits(&s->pb, 2, s->height>>12);
314  put_bits(&s->pb, 12, v>>18); //bitrate ext
315  put_bits(&s->pb, 1, 1); //marker
316  put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
317  put_bits(&s->pb, 1, s->low_delay);
318  put_bits(&s->pb, 2, s->mpeg2_frame_rate_ext.num-1); // frame_rate_ext_n
319  put_bits(&s->pb, 5, s->mpeg2_frame_rate_ext.den-1); // frame_rate_ext_d
320  }
321 
322  put_header(s, GOP_START_CODE);
323  put_bits(&s->pb, 1, s->drop_frame_timecode); /* drop frame flag */
324  /* time code : we must convert from the real frame rate to a
325  fake mpeg frame rate in case of low frame rate */
326  fps = (framerate.num + framerate.den/2)/ framerate.den;
327  time_code = s->current_picture_ptr->f.coded_picture_number + s->avctx->timecode_frame_start;
328 
329  s->gop_picture_number = s->current_picture_ptr->f.coded_picture_number;
330  av_assert0(s->drop_frame_timecode == !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME));
331  if (s->drop_frame_timecode)
332  time_code = av_timecode_adjust_ntsc_framenum2(time_code, fps);
333  put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
334  put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
335  put_bits(&s->pb, 1, 1);
336  put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
337  put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
338  put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
339  put_bits(&s->pb, 1, 0); /* broken link */
340  }
341 }
342 
343 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
344  while (run >= 33) {
345  put_bits(&s->pb, 11, 0x008);
346  run -= 33;
347  }
348  put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
349  ff_mpeg12_mbAddrIncrTable[run][0]);
350 }
351 
352 static av_always_inline void put_qscale(MpegEncContext *s)
353 {
354  if(s->q_scale_type){
355  av_assert2(s->qscale>=1 && s->qscale <=12);
356  put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
357  }else{
358  put_bits(&s->pb, 5, s->qscale);
359  }
360 }
361 
362 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
363  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->height > 2800) {
364  put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
365  put_bits(&s->pb, 3, s->mb_y >> 7); /* slice_vertical_position_extension */
366  } else {
367  put_header(s, SLICE_MIN_START_CODE + s->mb_y);
368  }
369  put_qscale(s);
370  put_bits(&s->pb, 1, 0); /* slice extra information */
371 }
372 
373 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
374 {
375  mpeg1_encode_sequence_header(s);
376 
377  /* mpeg1 picture header */
378  put_header(s, PICTURE_START_CODE);
379  /* temporal reference */
380 
381  // RAL: s->picture_number instead of s->fake_picture_number
382  put_bits(&s->pb, 10, (s->picture_number -
383  s->gop_picture_number) & 0x3ff);
384  put_bits(&s->pb, 3, s->pict_type);
385 
386  s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
387  put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
388 
389  // RAL: Forward f_code also needed for B frames
390  if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
391  put_bits(&s->pb, 1, 0); /* half pel coordinates */
392  if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
393  put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
394  else
395  put_bits(&s->pb, 3, 7); /* forward_f_code */
396  }
397 
398  // RAL: Backward f_code necessary for B frames
399  if (s->pict_type == AV_PICTURE_TYPE_B) {
400  put_bits(&s->pb, 1, 0); /* half pel coordinates */
401  if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
402  put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
403  else
404  put_bits(&s->pb, 3, 7); /* backward_f_code */
405  }
406 
407  put_bits(&s->pb, 1, 0); /* extra bit picture */
408 
409  s->frame_pred_frame_dct = 1;
410  if(s->codec_id == AV_CODEC_ID_MPEG2VIDEO){
411  put_header(s, EXT_START_CODE);
412  put_bits(&s->pb, 4, 8); //pic ext
413  if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
414  put_bits(&s->pb, 4, s->f_code);
415  put_bits(&s->pb, 4, s->f_code);
416  }else{
417  put_bits(&s->pb, 8, 255);
418  }
419  if (s->pict_type == AV_PICTURE_TYPE_B) {
420  put_bits(&s->pb, 4, s->b_code);
421  put_bits(&s->pb, 4, s->b_code);
422  }else{
423  put_bits(&s->pb, 8, 255);
424  }
425  put_bits(&s->pb, 2, s->intra_dc_precision);
426 
427  av_assert0(s->picture_structure == PICT_FRAME);
428  put_bits(&s->pb, 2, s->picture_structure);
429  if (s->progressive_sequence) {
430  put_bits(&s->pb, 1, 0); /* no repeat */
431  } else {
432  put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
433  }
434  /* XXX: optimize the generation of this flag with entropy
435  measures */
436  s->frame_pred_frame_dct = s->progressive_sequence;
437 
438  put_bits(&s->pb, 1, s->frame_pred_frame_dct);
439  put_bits(&s->pb, 1, s->concealment_motion_vectors);
440  put_bits(&s->pb, 1, s->q_scale_type);
441  put_bits(&s->pb, 1, s->intra_vlc_format);
442  put_bits(&s->pb, 1, s->alternate_scan);
443  put_bits(&s->pb, 1, s->repeat_first_field);
444  s->progressive_frame = s->progressive_sequence;
445  put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
446  put_bits(&s->pb, 1, s->progressive_frame);
447  put_bits(&s->pb, 1, 0); //composite_display_flag
448  }
449  if (s->scan_offset) {
450  int i;
451 
452  put_header(s, USER_START_CODE);
453  for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
454  put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
455  }
456  }
457 
458  s->mb_y=0;
459  ff_mpeg1_encode_slice_header(s);
460 }
461 
462 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
463  int has_mv, int field_motion)
464 {
465  put_bits(&s->pb, n, bits);
466  if (!s->frame_pred_frame_dct) {
467  if (has_mv)
468  put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
469  put_bits(&s->pb, 1, s->interlaced_dct);
470  }
471 }
472 
473 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
474  DCTELEM block[6][64],
475  int motion_x, int motion_y,
476  int mb_block_count)
477 {
478  int i, cbp;
479  const int mb_x = s->mb_x;
480  const int mb_y = s->mb_y;
481  const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
482 
483  /* compute cbp */
484  cbp = 0;
485  for(i=0;i<mb_block_count;i++) {
486  if (s->block_last_index[i] >= 0)
487  cbp |= 1 << (mb_block_count - 1 - i);
488  }
489 
490  if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
491  (mb_x != s->mb_width - 1 || (mb_y != s->end_mb_y - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&
492  ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
493  (s->pict_type == AV_PICTURE_TYPE_B && s->mv_dir == s->last_mv_dir && (((s->mv_dir & MV_DIR_FORWARD) ? ((s->mv[0][0][0] - s->last_mv[0][0][0])|(s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
494  ((s->mv_dir & MV_DIR_BACKWARD) ? ((s->mv[1][0][0] - s->last_mv[1][0][0])|(s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
495  s->mb_skip_run++;
496  s->qscale -= s->dquant;
497  s->skip_count++;
498  s->misc_bits++;
499  s->last_bits++;
500  if(s->pict_type == AV_PICTURE_TYPE_P){
501  s->last_mv[0][1][0]= s->last_mv[0][0][0]=
502  s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
503  }
504  } else {
505  if(first_mb){
506  av_assert0(s->mb_skip_run == 0);
507  encode_mb_skip_run(s, s->mb_x);
508  }else{
509  encode_mb_skip_run(s, s->mb_skip_run);
510  }
511 
512  if (s->pict_type == AV_PICTURE_TYPE_I) {
513  if(s->dquant && cbp){
514  put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
515  put_qscale(s);
516  }else{
517  put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
518  s->qscale -= s->dquant;
519  }
520  s->misc_bits+= get_bits_diff(s);
521  s->i_count++;
522  } else if (s->mb_intra) {
523  if(s->dquant && cbp){
524  put_mb_modes(s, 6, 0x01, 0, 0);
525  put_qscale(s);
526  }else{
527  put_mb_modes(s, 5, 0x03, 0, 0);
528  s->qscale -= s->dquant;
529  }
530  s->misc_bits+= get_bits_diff(s);
531  s->i_count++;
532  memset(s->last_mv, 0, sizeof(s->last_mv));
533  } else if (s->pict_type == AV_PICTURE_TYPE_P) {
534  if(s->mv_type == MV_TYPE_16X16){
535  if (cbp != 0) {
536  if ((motion_x|motion_y) == 0) {
537  if(s->dquant){
538  put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
539  put_qscale(s);
540  }else{
541  put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
542  }
543  s->misc_bits+= get_bits_diff(s);
544  } else {
545  if(s->dquant){
546  put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
547  put_qscale(s);
548  }else{
549  put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
550  }
551  s->misc_bits+= get_bits_diff(s);
552  mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
553  mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
554  s->mv_bits+= get_bits_diff(s);
555  }
556  } else {
557  put_bits(&s->pb, 3, 1); /* motion only */
558  if (!s->frame_pred_frame_dct)
559  put_bits(&s->pb, 2, 2); /* motion_type: frame */
560  s->misc_bits+= get_bits_diff(s);
561  mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
562  mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
563  s->qscale -= s->dquant;
564  s->mv_bits+= get_bits_diff(s);
565  }
566  s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
567  s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
568  }else{
569  av_assert2(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
570 
571  if (cbp) {
572  if(s->dquant){
573  put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
574  put_qscale(s);
575  }else{
576  put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
577  }
578  } else {
579  put_bits(&s->pb, 3, 1); /* motion only */
580  put_bits(&s->pb, 2, 1); /* motion_type: field */
581  s->qscale -= s->dquant;
582  }
583  s->misc_bits+= get_bits_diff(s);
584  for(i=0; i<2; i++){
585  put_bits(&s->pb, 1, s->field_select[0][i]);
586  mpeg1_encode_motion(s, s->mv[0][i][0] - s->last_mv[0][i][0] , s->f_code);
587  mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
588  s->last_mv[0][i][0]= s->mv[0][i][0];
589  s->last_mv[0][i][1]= 2*s->mv[0][i][1];
590  }
591  s->mv_bits+= get_bits_diff(s);
592  }
593  if(cbp) {
594  if (s->chroma_y_shift) {
595  put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
596  } else {
597  put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
598  put_sbits(&s->pb, 2, cbp);
599  }
600  }
601  s->f_count++;
602  } else{
603  if(s->mv_type == MV_TYPE_16X16){
604  if (cbp){ // With coded bloc pattern
605  if (s->dquant) {
606  if(s->mv_dir == MV_DIR_FORWARD)
607  put_mb_modes(s, 6, 3, 1, 0);
608  else
609  put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
610  put_qscale(s);
611  } else {
612  put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
613  }
614  }else{ // No coded bloc pattern
615  put_bits(&s->pb, 5-s->mv_dir, 2);
616  if (!s->frame_pred_frame_dct)
617  put_bits(&s->pb, 2, 2); /* motion_type: frame */
618  s->qscale -= s->dquant;
619  }
620  s->misc_bits += get_bits_diff(s);
621  if (s->mv_dir&MV_DIR_FORWARD){
622  mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
623  mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
624  s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
625  s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
626  s->f_count++;
627  }
628  if (s->mv_dir&MV_DIR_BACKWARD){
629  mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
630  mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
631  s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
632  s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
633  s->b_count++;
634  }
635  }else{
636  av_assert2(s->mv_type == MV_TYPE_FIELD);
637  av_assert2(!s->frame_pred_frame_dct);
638  if (cbp){ // With coded bloc pattern
639  if (s->dquant) {
640  if(s->mv_dir == MV_DIR_FORWARD)
641  put_mb_modes(s, 6, 3, 1, 1);
642  else
643  put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
644  put_qscale(s);
645  } else {
646  put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
647  }
648  }else{ // No coded bloc pattern
649  put_bits(&s->pb, 5-s->mv_dir, 2);
650  put_bits(&s->pb, 2, 1); /* motion_type: field */
651  s->qscale -= s->dquant;
652  }
653  s->misc_bits += get_bits_diff(s);
654  if (s->mv_dir&MV_DIR_FORWARD){
655  for(i=0; i<2; i++){
656  put_bits(&s->pb, 1, s->field_select[0][i]);
657  mpeg1_encode_motion(s, s->mv[0][i][0] - s->last_mv[0][i][0] , s->f_code);
658  mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
659  s->last_mv[0][i][0]= s->mv[0][i][0];
660  s->last_mv[0][i][1]= 2*s->mv[0][i][1];
661  }
662  s->f_count++;
663  }
664  if (s->mv_dir&MV_DIR_BACKWARD){
665  for(i=0; i<2; i++){
666  put_bits(&s->pb, 1, s->field_select[1][i]);
667  mpeg1_encode_motion(s, s->mv[1][i][0] - s->last_mv[1][i][0] , s->b_code);
668  mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
669  s->last_mv[1][i][0]= s->mv[1][i][0];
670  s->last_mv[1][i][1]= 2*s->mv[1][i][1];
671  }
672  s->b_count++;
673  }
674  }
675  s->mv_bits += get_bits_diff(s);
676  if(cbp) {
677  if (s->chroma_y_shift) {
678  put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
679  } else {
680  put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
681  put_sbits(&s->pb, 2, cbp);
682  }
683  }
684  }
685  for(i=0;i<mb_block_count;i++) {
686  if (cbp & (1 << (mb_block_count - 1 - i))) {
687  mpeg1_encode_block(s, block[i], i);
688  }
689  }
690  s->mb_skip_run = 0;
691  if(s->mb_intra)
692  s->i_tex_bits+= get_bits_diff(s);
693  else
694  s->p_tex_bits+= get_bits_diff(s);
695  }
696 }
697 
698 void ff_mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
699 {
700  if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
701  else mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
702 }
703 
704 // RAL: Parameter added: f_or_b_code
705 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
706 {
707  if (val == 0) {
708  /* zero vector */
709  put_bits(&s->pb,
710  ff_mpeg12_mbMotionVectorTable[0][1],
711  ff_mpeg12_mbMotionVectorTable[0][0]);
712  } else {
713  int code, sign, bits;
714  int bit_size = f_or_b_code - 1;
715  int range = 1 << bit_size;
716  /* modulo encoding */
717  val = sign_extend(val, 5 + bit_size);
718 
719  if (val >= 0) {
720  val--;
721  code = (val >> bit_size) + 1;
722  bits = val & (range - 1);
723  sign = 0;
724  } else {
725  val = -val;
726  val--;
727  code = (val >> bit_size) + 1;
728  bits = val & (range - 1);
729  sign = 1;
730  }
731 
732  av_assert2(code > 0 && code <= 16);
733 
734  put_bits(&s->pb,
735  ff_mpeg12_mbMotionVectorTable[code][1],
736  ff_mpeg12_mbMotionVectorTable[code][0]);
737 
738  put_bits(&s->pb, 1, sign);
739  if (bit_size > 0) {
740  put_bits(&s->pb, bit_size, bits);
741  }
742  }
743 }
744 
745 void ff_mpeg1_encode_init(MpegEncContext *s)
746 {
747  static int done=0;
748 
749  ff_mpeg12_common_init(s);
750 
751  if(!done){
752  int f_code;
753  int mv;
754  int i;
755 
756  done=1;
757  ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
758  ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
759 
760  for(i=0; i<64; i++)
761  {
762  mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
763  mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
764  }
765 
766  init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
767  if(s->intra_vlc_format)
768  init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
769 
770  /* build unified dc encoding tables */
771  for(i=-255; i<256; i++)
772  {
773  int adiff, index;
774  int bits, code;
775  int diff=i;
776 
777  adiff = FFABS(diff);
778  if(diff<0) diff--;
779  index = av_log2(2*adiff);
780 
781  bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
782  code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
783  mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
784 
785  bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
786  code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
787  mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
788  }
789 
790  for(f_code=1; f_code<=MAX_FCODE; f_code++){
791  for(mv=-MAX_MV; mv<=MAX_MV; mv++){
792  int len;
793 
794  if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
795  else{
796  int val, bit_size, code;
797 
798  bit_size = f_code - 1;
799 
800  val=mv;
801  if (val < 0)
802  val = -val;
803  val--;
804  code = (val >> bit_size) + 1;
805  if(code<17){
806  len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
807  }else{
808  len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
809  }
810  }
811 
812  mv_penalty[f_code][mv+MAX_MV]= len;
813  }
814  }
815 
816 
817  for(f_code=MAX_FCODE; f_code>0; f_code--){
818  for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
819  fcode_tab[mv+MAX_MV]= f_code;
820  }
821  }
822  }
823  s->me.mv_penalty= mv_penalty;
824  s->fcode_tab= fcode_tab;
825  if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO){
826  s->min_qcoeff=-255;
827  s->max_qcoeff= 255;
828  }else{
829  s->min_qcoeff=-2047;
830  s->max_qcoeff= 2047;
831  }
832  if (s->intra_vlc_format) {
833  s->intra_ac_vlc_length=
834  s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
835  } else {
836  s->intra_ac_vlc_length=
837  s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
838  }
839  s->inter_ac_vlc_length=
840  s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
841 }
842 
843 static inline void encode_dc(MpegEncContext *s, int diff, int component)
844 {
845  if(((unsigned) (diff+255)) >= 511){
846  int index;
847 
848  if(diff<0){
849  index= av_log2_16bit(-2*diff);
850  diff--;
851  }else{
852  index= av_log2_16bit(2*diff);
853  }
854  if (component == 0) {
855  put_bits(
856  &s->pb,
857  ff_mpeg12_vlc_dc_lum_bits[index] + index,
858  (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
859  }else{
860  put_bits(
861  &s->pb,
862  ff_mpeg12_vlc_dc_chroma_bits[index] + index,
863  (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
864  }
865  }else{
866  if (component == 0) {
867  put_bits(
868  &s->pb,
869  mpeg1_lum_dc_uni[diff+255]&0xFF,
870  mpeg1_lum_dc_uni[diff+255]>>8);
871  } else {
872  put_bits(
873  &s->pb,
874  mpeg1_chr_dc_uni[diff+255]&0xFF,
875  mpeg1_chr_dc_uni[diff+255]>>8);
876  }
877  }
878 }
879 
880 static void mpeg1_encode_block(MpegEncContext *s,
881  DCTELEM *block,
882  int n)
883 {
884  int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
885  int code, component;
886  const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
887 
888  last_index = s->block_last_index[n];
889 
890  /* DC coef */
891  if (s->mb_intra) {
892  component = (n <= 3 ? 0 : (n&1) + 1);
893  dc = block[0]; /* overflow is impossible */
894  diff = dc - s->last_dc[component];
895  encode_dc(s, diff, component);
896  s->last_dc[component] = dc;
897  i = 1;
898  if (s->intra_vlc_format)
899  table_vlc = ff_rl_mpeg2.table_vlc;
900  } else {
901  /* encode the first coefficient : needs to be done here because
902  it is handled slightly differently */
903  level = block[0];
904  if (abs(level) == 1) {
905  code = ((uint32_t)level >> 31); /* the sign bit */
906  put_bits(&s->pb, 2, code | 0x02);
907  i = 1;
908  } else {
909  i = 0;
910  last_non_zero = -1;
911  goto next_coef;
912  }
913  }
914 
915  /* now quantify & encode AC coefs */
916  last_non_zero = i - 1;
917 
918  for(;i<=last_index;i++) {
919  j = s->intra_scantable.permutated[i];
920  level = block[j];
921  next_coef:
922  /* encode using VLC */
923  if (level != 0) {
924  run = i - last_non_zero - 1;
925 
926  alevel= level;
927  MASK_ABS(sign, alevel);
928  sign&=1;
929 
930  if (alevel <= mpeg1_max_level[0][run]){
931  code= mpeg1_index_run[0][run] + alevel - 1;
932  /* store the vlc & sign at once */
933  put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
934  } else {
935  /* escape seems to be pretty rare <5% so I do not optimize it */
936  put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
937  /* escape: only clip in this case */
938  put_bits(&s->pb, 6, run);
939  if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO){
940  if (alevel < 128) {
941  put_sbits(&s->pb, 8, level);
942  } else {
943  if (level < 0) {
944  put_bits(&s->pb, 16, 0x8001 + level + 255);
945  } else {
946  put_sbits(&s->pb, 16, level);
947  }
948  }
949  }else{
950  put_sbits(&s->pb, 12, level);
951  }
952  }
953  last_non_zero = i;
954  }
955  }
956  /* end of block */
957  put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
958 }
959 
960 #define OFFSET(x) offsetof(MpegEncContext, x)
961 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
962 #define COMMON_OPTS\
963  { "gop_timecode", "MPEG GOP Timecode in hh:mm:ss[:;.]ff format", OFFSET(tc_opt_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, VE },\
964  { "intra_vlc", "Use MPEG-2 intra VLC table.", OFFSET(intra_vlc_format), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },\
965  { "drop_frame_timecode", "Timecode is in drop frame format.", OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE}, \
966  { "scan_offset", "Reserve space for SVCD scan offset user data.", OFFSET(scan_offset), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
967 
968 static const AVOption mpeg1_options[] = {
969  COMMON_OPTS
970  FF_MPV_COMMON_OPTS
971  { NULL },
972 };
973 
974 static const AVOption mpeg2_options[] = {
975  COMMON_OPTS
976  { "non_linear_quant", "Use nonlinear quantizer.", OFFSET(q_scale_type), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
977  { "alternate_scan", "Enable alternate scantable.", OFFSET(alternate_scan), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
978  FF_MPV_COMMON_OPTS
979  { NULL },
980 };
981 
982 #define mpeg12_class(x)\
983 static const AVClass mpeg## x ##_class = {\
984  .class_name = "mpeg" #x "video encoder",\
985  .item_name = av_default_item_name,\
986  .option = mpeg## x ##_options,\
987  .version = LIBAVUTIL_VERSION_INT,\
988 };
989 
990 mpeg12_class(1)
991 mpeg12_class(2)
992 
993 AVCodec ff_mpeg1video_encoder = {
994  .name = "mpeg1video",
995  .type = AVMEDIA_TYPE_VIDEO,
996  .id = AV_CODEC_ID_MPEG1VIDEO,
997  .priv_data_size = sizeof(MpegEncContext),
998  .init = encode_init,
999  .encode2 = ff_MPV_encode_picture,
1000  .close = ff_MPV_encode_end,
1001  .supported_framerates = ff_mpeg12_frame_rate_tab + 1,
1002  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P,
1003  AV_PIX_FMT_NONE },
1004  .capabilities = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1005  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
1006  .priv_class = &mpeg1_class,
1007 };
1008 
1009 AVCodec ff_mpeg2video_encoder = {
1010  .name = "mpeg2video",
1011  .type = AVMEDIA_TYPE_VIDEO,
1012  .id = AV_CODEC_ID_MPEG2VIDEO,
1013  .priv_data_size = sizeof(MpegEncContext),
1014  .init = encode_init,
1015  .encode2 = ff_MPV_encode_picture,
1016  .close = ff_MPV_encode_end,
1017  .supported_framerates = ff_mpeg2_frame_rate_tab,
1018  .pix_fmts = (const enum AVPixelFormat[]){
1019  AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE
1020  },
1021  .capabilities = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1022  .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
1023  .priv_class = &mpeg2_class,
1024 };
Generated on Sat May 25 2013 03:58:37 for FFmpeg by   doxygen 1.8.2