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avcodec/mpeg12: Don't initialize encoder-only parts of RLTable
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1 /*
2  * MPEG-1/2 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  * MPEG-1/2 encoder
26  */
27
28 #include <stdint.h>
29
30 #include "config.h"
31 #include "libavutil/attributes.h"
32 #include "libavutil/avassert.h"
33 #include "libavutil/log.h"
34 #include "libavutil/opt.h"
35 #include "libavutil/thread.h"
36 #include "libavutil/timecode.h"
37 #include "libavutil/stereo3d.h"
38
39 #include "avcodec.h"
40 #include "bytestream.h"
41 #include "mathops.h"
42 #include "mpeg12.h"
43 #include "mpeg12data.h"
44 #include "mpegutils.h"
45 #include "mpegvideo.h"
46 #include "profiles.h"
47
48 #if CONFIG_MPEG1VIDEO_ENCODER || CONFIG_MPEG2VIDEO_ENCODER
49 static const uint8_t svcd_scan_offset_placeholder[] = {
50     0x10, 0x0E, 0x00, 0x80, 0x81, 0x00, 0x80,
51     0x81, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
52 };
53
54 static uint8_t mv_penalty[MAX_FCODE + 1][MAX_DMV * 2 + 1];
55 static uint8_t fcode_tab[MAX_MV * 2 + 1];
56
57 static uint8_t uni_mpeg1_ac_vlc_len[64 * 64 * 2];
58 static uint8_t uni_mpeg2_ac_vlc_len[64 * 64 * 2];
59
60 /* simple include everything table for dc, first byte is bits
61  * number next 3 are code */
62 static uint32_t mpeg1_lum_dc_uni[512];
63 static uint32_t mpeg1_chr_dc_uni[512];
64
65 static uint8_t mpeg1_index_run[2][64];
66 static int8_t  mpeg1_max_level[2][64];
67
68 #define A53_MAX_CC_COUNT 0x1f
69 #endif /* CONFIG_MPEG1VIDEO_ENCODER || CONFIG_MPEG2VIDEO_ENCODER */
70
71 av_cold void ff_mpeg1_init_uni_ac_vlc(const RLTable *rl, uint8_t *uni_ac_vlc_len)
72 {
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             int alevel = FFABS(level);
83
84             if (alevel > rl->max_level[0][run])
85                 code = 111;                         /* rl->n */
86             else
87                 code = rl->index_run[0][run] + alevel - 1;
88
89             if (code < 111) {                       /* rl->n */
90                 /* length of VLC and sign */
91                 len = rl->table_vlc[code][1] + 1;
92             } else {
93                 len = rl->table_vlc[111 /* rl->n */][1] + 6;
94
95                 if (alevel < 128)
96                     len += 8;
97                 else
98                     len += 16;
99             }
100
101             uni_ac_vlc_len[UNI_AC_ENC_INDEX(run, i)] = len;
102         }
103     }
104 }
105
106 #if CONFIG_MPEG1VIDEO_ENCODER || CONFIG_MPEG2VIDEO_ENCODER
107 static int find_frame_rate_index(MpegEncContext *s)
108 {
109     int i;
110     AVRational bestq = (AVRational) {0, 0};
111     AVRational ext;
112     AVRational target = av_inv_q(s->avctx->time_base);
113
114     for (i = 1; i < 14; i++) {
115         if (s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL &&
116             i >= 9)
117             break;
118
119         for (ext.num=1; ext.num <= 4; ext.num++) {
120             for (ext.den=1; ext.den <= 32; ext.den++) {
121                 AVRational q = av_mul_q(ext, ff_mpeg12_frame_rate_tab[i]);
122
123                 if (s->codec_id != AV_CODEC_ID_MPEG2VIDEO && (ext.den!=1 || ext.num!=1))
124                     continue;
125                 if (av_gcd(ext.den, ext.num) != 1)
126                     continue;
127
128                 if (    bestq.num==0
129                     || av_nearer_q(target, bestq, q) < 0
130                     || ext.num==1 && ext.den==1 && av_nearer_q(target, bestq, q) == 0) {
131                     bestq               = q;
132                     s->frame_rate_index = i;
133                     s->mpeg2_frame_rate_ext.num = ext.num;
134                     s->mpeg2_frame_rate_ext.den = ext.den;
135                 }
136             }
137         }
138     }
139
140     if (av_cmp_q(target, bestq))
141         return -1;
142     else
143         return 0;
144 }
145
146 static av_cold int encode_init(AVCodecContext *avctx)
147 {
148     int ret;
149     MpegEncContext *s = avctx->priv_data;
150
151     if ((ret = ff_mpv_encode_init(avctx)) < 0)
152         return ret;
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, "MPEG-1/2 does not support %d/%d fps\n",
157                    avctx->time_base.den, avctx->time_base.num);
158             return AVERROR(EINVAL);
159         } else {
160             av_log(avctx, AV_LOG_INFO,
161                    "MPEG-1/2 does not support %d/%d fps, there may be AV sync issues\n",
162                    avctx->time_base.den, avctx->time_base.num);
163         }
164     }
165
166     if (avctx->profile == FF_PROFILE_UNKNOWN) {
167         if (avctx->level != FF_LEVEL_UNKNOWN) {
168             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
169             return AVERROR(EINVAL);
170         }
171         /* Main or 4:2:2 */
172         avctx->profile = s->chroma_format == CHROMA_420 ? FF_PROFILE_MPEG2_MAIN : FF_PROFILE_MPEG2_422;
173     }
174
175     if (avctx->level == FF_LEVEL_UNKNOWN) {
176         if (avctx->profile == FF_PROFILE_MPEG2_422) {   /* 4:2:2 */
177             if (avctx->width <= 720 && avctx->height <= 608)
178                 avctx->level = 5;                   /* Main */
179             else
180                 avctx->level = 2;                   /* High */
181         } else {
182             if (avctx->profile != FF_PROFILE_MPEG2_HIGH && s->chroma_format != CHROMA_420) {
183                 av_log(avctx, AV_LOG_ERROR,
184                        "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
185                 return AVERROR(EINVAL);
186             }
187             if (avctx->width <= 720 && avctx->height <= 576)
188                 avctx->level = 8;                   /* Main */
189             else if (avctx->width <= 1440)
190                 avctx->level = 6;                   /* High 1440 */
191             else
192                 avctx->level = 4;                   /* High */
193         }
194     }
195
196     if ((avctx->width & 0xFFF) == 0 && (avctx->height & 0xFFF) == 1) {
197         av_log(avctx, AV_LOG_ERROR, "Width / Height is invalid for MPEG2\n");
198         return AVERROR(EINVAL);
199     }
200
201     if (s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
202         if ((avctx->width & 0xFFF) == 0 || (avctx->height & 0xFFF) == 0) {
203             av_log(avctx, AV_LOG_ERROR, "Width or Height are not allowed to be multiples of 4096\n"
204                                         "add '-strict %d' if you want to use them anyway.\n", FF_COMPLIANCE_UNOFFICIAL);
205             return AVERROR(EINVAL);
206         }
207     }
208
209     s->drop_frame_timecode = s->drop_frame_timecode || !!(avctx->flags2 & AV_CODEC_FLAG2_DROP_FRAME_TIMECODE);
210     if (s->drop_frame_timecode)
211         s->tc.flags |= AV_TIMECODE_FLAG_DROPFRAME;
212     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
213         av_log(avctx, AV_LOG_ERROR,
214                "Drop frame time code only allowed with 1001/30000 fps\n");
215         return AVERROR(EINVAL);
216     }
217
218 #if FF_API_PRIVATE_OPT
219 FF_DISABLE_DEPRECATION_WARNINGS
220     if (avctx->timecode_frame_start)
221         s->timecode_frame_start = avctx->timecode_frame_start;
222 FF_ENABLE_DEPRECATION_WARNINGS
223 #endif
224
225     if (s->tc_opt_str) {
226         AVRational rate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
227         int ret = av_timecode_init_from_string(&s->tc, rate, s->tc_opt_str, s);
228         if (ret < 0)
229             return ret;
230         s->drop_frame_timecode = !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME);
231         s->timecode_frame_start = s->tc.start;
232     } else {
233         s->timecode_frame_start = 0; // default is -1
234     }
235
236     return 0;
237 }
238
239 static void put_header(MpegEncContext *s, int header)
240 {
241     align_put_bits(&s->pb);
242     put_bits(&s->pb, 16, header >> 16);
243     put_sbits(&s->pb, 16, header);
244 }
245
246 /* put sequence header if needed */
247 static void mpeg1_encode_sequence_header(MpegEncContext *s)
248 {
249     unsigned int vbv_buffer_size, fps, v;
250     int i, constraint_parameter_flag;
251     uint64_t time_code;
252     int64_t best_aspect_error = INT64_MAX;
253     AVRational aspect_ratio = s->avctx->sample_aspect_ratio;
254
255     if (aspect_ratio.num == 0 || aspect_ratio.den == 0)
256         aspect_ratio = (AVRational){1,1};             // pixel aspect 1.1 (VGA)
257
258     if (s->current_picture.f->key_frame) {
259         AVRational framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
260
261         /* MPEG-1 header repeated every GOP */
262         put_header(s, SEQ_START_CODE);
263
264         put_sbits(&s->pb, 12, s->width  & 0xFFF);
265         put_sbits(&s->pb, 12, s->height & 0xFFF);
266
267         for (i = 1; i < 15; i++) {
268             int64_t error = aspect_ratio.num * (1LL<<32) / aspect_ratio.den;
269             if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO || i <= 1)
270                 error -= (1LL<<32) / ff_mpeg1_aspect[i];
271             else
272                 error -= (1LL<<32)*ff_mpeg2_aspect[i].num * s->height / s->width / ff_mpeg2_aspect[i].den;
273
274             error = FFABS(error);
275
276             if (error - 2 <= best_aspect_error) {
277                 best_aspect_error    = error;
278                 s->aspect_ratio_info = i;
279             }
280         }
281
282         put_bits(&s->pb, 4, s->aspect_ratio_info);
283         put_bits(&s->pb, 4, s->frame_rate_index);
284
285         if (s->avctx->rc_max_rate) {
286             v = (s->avctx->rc_max_rate + 399) / 400;
287             if (v > 0x3ffff && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
288                 v = 0x3ffff;
289         } else {
290             v = 0x3FFFF;
291         }
292
293         if (s->avctx->rc_buffer_size)
294             vbv_buffer_size = s->avctx->rc_buffer_size;
295         else
296             /* VBV calculation: Scaled so that a VCD has the proper
297              * VBV size of 40 kilobytes */
298             vbv_buffer_size = ((20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
299         vbv_buffer_size = (vbv_buffer_size + 16383) / 16384;
300
301         put_sbits(&s->pb, 18, v);
302         put_bits(&s->pb, 1, 1);         // marker
303         put_sbits(&s->pb, 10, vbv_buffer_size);
304
305         constraint_parameter_flag =
306             s->width  <= 768                                    &&
307             s->height <= 576                                    &&
308             s->mb_width * s->mb_height                 <= 396   &&
309             s->mb_width * s->mb_height * framerate.num <= 396 * 25 * framerate.den &&
310             framerate.num <= framerate.den * 30                 &&
311             s->avctx->me_range                                  &&
312             s->avctx->me_range < 128                            &&
313             vbv_buffer_size <= 20                               &&
314             v <= 1856000 / 400                                  &&
315             s->codec_id == AV_CODEC_ID_MPEG1VIDEO;
316
317         put_bits(&s->pb, 1, constraint_parameter_flag);
318
319         ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
320         ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
321
322         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
323             AVFrameSideData *side_data;
324             int width = s->width;
325             int height = s->height;
326             int use_seq_disp_ext;
327
328             put_header(s, EXT_START_CODE);
329             put_bits(&s->pb, 4, 1);                 // seq ext
330
331             put_bits(&s->pb, 1, s->avctx->profile == FF_PROFILE_MPEG2_422); // escx 1 for 4:2:2 profile
332
333             put_bits(&s->pb, 3, s->avctx->profile); // profile
334             put_bits(&s->pb, 4, s->avctx->level);   // level
335
336             put_bits(&s->pb, 1, s->progressive_sequence);
337             put_bits(&s->pb, 2, s->chroma_format);
338             put_bits(&s->pb, 2, s->width  >> 12);
339             put_bits(&s->pb, 2, s->height >> 12);
340             put_bits(&s->pb, 12, v >> 18);          // bitrate ext
341             put_bits(&s->pb, 1, 1);                 // marker
342             put_bits(&s->pb, 8, vbv_buffer_size >> 10); // vbv buffer ext
343             put_bits(&s->pb, 1, s->low_delay);
344             put_bits(&s->pb, 2, s->mpeg2_frame_rate_ext.num-1); // frame_rate_ext_n
345             put_bits(&s->pb, 5, s->mpeg2_frame_rate_ext.den-1); // frame_rate_ext_d
346
347             side_data = av_frame_get_side_data(s->current_picture_ptr->f, AV_FRAME_DATA_PANSCAN);
348             if (side_data) {
349                 AVPanScan *pan_scan = (AVPanScan *)side_data->data;
350                 if (pan_scan->width && pan_scan->height) {
351                     width = pan_scan->width >> 4;
352                     height = pan_scan->height >> 4;
353                 }
354             }
355
356             use_seq_disp_ext = (width != s->width ||
357                                 height != s->height ||
358                                 s->avctx->color_primaries != AVCOL_PRI_UNSPECIFIED ||
359                                 s->avctx->color_trc != AVCOL_TRC_UNSPECIFIED ||
360                                 s->avctx->colorspace != AVCOL_SPC_UNSPECIFIED ||
361                                 s->video_format != VIDEO_FORMAT_UNSPECIFIED);
362
363             if (s->seq_disp_ext == 1 || (s->seq_disp_ext == -1 && use_seq_disp_ext)) {
364                 put_header(s, EXT_START_CODE);
365                 put_bits(&s->pb, 4, 2);                         // sequence display extension
366                 put_bits(&s->pb, 3, s->video_format);           // video_format
367                 put_bits(&s->pb, 1, 1);                         // colour_description
368                 put_bits(&s->pb, 8, s->avctx->color_primaries); // colour_primaries
369                 put_bits(&s->pb, 8, s->avctx->color_trc);       // transfer_characteristics
370                 put_bits(&s->pb, 8, s->avctx->colorspace);      // matrix_coefficients
371                 put_bits(&s->pb, 14, width);                    // display_horizontal_size
372                 put_bits(&s->pb, 1, 1);                         // marker_bit
373                 put_bits(&s->pb, 14, height);                   // display_vertical_size
374                 put_bits(&s->pb, 3, 0);                         // remaining 3 bits are zero padding
375             }
376         }
377
378         put_header(s, GOP_START_CODE);
379         put_bits(&s->pb, 1, s->drop_frame_timecode);    // drop frame flag
380         /* time code: we must convert from the real frame rate to a
381          * fake MPEG frame rate in case of low frame rate */
382         fps       = (framerate.num + framerate.den / 2) / framerate.den;
383         time_code = s->current_picture_ptr->f->coded_picture_number +
384                     s->timecode_frame_start;
385
386         s->gop_picture_number = s->current_picture_ptr->f->coded_picture_number;
387
388         av_assert0(s->drop_frame_timecode == !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME));
389         if (s->drop_frame_timecode)
390             time_code = av_timecode_adjust_ntsc_framenum2(time_code, fps);
391
392         put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
393         put_bits(&s->pb, 6, (uint32_t)((time_code / (fps *   60)) % 60));
394         put_bits(&s->pb, 1, 1);
395         put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
396         put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
397         put_bits(&s->pb, 1, !!(s->avctx->flags & AV_CODEC_FLAG_CLOSED_GOP) || s->intra_only || !s->gop_picture_number);
398         put_bits(&s->pb, 1, 0);                     // broken link
399     }
400 }
401
402 static inline void encode_mb_skip_run(MpegEncContext *s, int run)
403 {
404     while (run >= 33) {
405         put_bits(&s->pb, 11, 0x008);
406         run -= 33;
407     }
408     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
409              ff_mpeg12_mbAddrIncrTable[run][0]);
410 }
411
412 static av_always_inline void put_qscale(MpegEncContext *s)
413 {
414     put_bits(&s->pb, 5, s->qscale);
415 }
416
417 void ff_mpeg1_encode_slice_header(MpegEncContext *s)
418 {
419     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->height > 2800) {
420         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
421         /* slice_vertical_position_extension */
422         put_bits(&s->pb, 3, s->mb_y >> 7);
423     } else {
424         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
425     }
426     put_qscale(s);
427     /* slice extra information */
428     put_bits(&s->pb, 1, 0);
429 }
430
431 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
432 {
433     AVFrameSideData *side_data;
434     mpeg1_encode_sequence_header(s);
435
436     /* MPEG-1 picture header */
437     put_header(s, PICTURE_START_CODE);
438     /* temporal reference */
439
440     // RAL: s->picture_number instead of s->fake_picture_number
441     put_bits(&s->pb, 10,
442              (s->picture_number - s->gop_picture_number) & 0x3ff);
443     put_bits(&s->pb, 3, s->pict_type);
444
445     s->vbv_delay_ptr = s->pb.buf + put_bits_count(&s->pb) / 8;
446     put_bits(&s->pb, 16, 0xFFFF);               /* vbv_delay */
447
448     // RAL: Forward f_code also needed for B-frames
449     if (s->pict_type == AV_PICTURE_TYPE_P ||
450         s->pict_type == AV_PICTURE_TYPE_B) {
451         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */
452         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
453             put_bits(&s->pb, 3, s->f_code);     /* forward_f_code */
454         else
455             put_bits(&s->pb, 3, 7);             /* forward_f_code */
456     }
457
458     // RAL: Backward f_code necessary for B-frames
459     if (s->pict_type == AV_PICTURE_TYPE_B) {
460         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */
461         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
462             put_bits(&s->pb, 3, s->b_code);     /* backward_f_code */
463         else
464             put_bits(&s->pb, 3, 7);             /* backward_f_code */
465     }
466
467     put_bits(&s->pb, 1, 0);                     /* extra bit picture */
468
469     s->frame_pred_frame_dct = 1;
470     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
471         put_header(s, EXT_START_CODE);
472         put_bits(&s->pb, 4, 8);                 /* pic ext */
473         if (s->pict_type == AV_PICTURE_TYPE_P ||
474             s->pict_type == AV_PICTURE_TYPE_B) {
475             put_bits(&s->pb, 4, s->f_code);
476             put_bits(&s->pb, 4, s->f_code);
477         } else {
478             put_bits(&s->pb, 8, 255);
479         }
480         if (s->pict_type == AV_PICTURE_TYPE_B) {
481             put_bits(&s->pb, 4, s->b_code);
482             put_bits(&s->pb, 4, s->b_code);
483         } else {
484             put_bits(&s->pb, 8, 255);
485         }
486         put_bits(&s->pb, 2, s->intra_dc_precision);
487
488         av_assert0(s->picture_structure == PICT_FRAME);
489         put_bits(&s->pb, 2, s->picture_structure);
490         if (s->progressive_sequence)
491             put_bits(&s->pb, 1, 0);             /* no repeat */
492         else
493             put_bits(&s->pb, 1, s->current_picture_ptr->f->top_field_first);
494         /* XXX: optimize the generation of this flag with entropy measures */
495         s->frame_pred_frame_dct = s->progressive_sequence;
496
497         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
498         put_bits(&s->pb, 1, s->concealment_motion_vectors);
499         put_bits(&s->pb, 1, s->q_scale_type);
500         put_bits(&s->pb, 1, s->intra_vlc_format);
501         put_bits(&s->pb, 1, s->alternate_scan);
502         put_bits(&s->pb, 1, s->repeat_first_field);
503         s->progressive_frame = s->progressive_sequence;
504         /* chroma_420_type */
505         put_bits(&s->pb, 1, s->chroma_format ==
506                             CHROMA_420 ? s->progressive_frame : 0);
507         put_bits(&s->pb, 1, s->progressive_frame);
508         put_bits(&s->pb, 1, 0);                 /* composite_display_flag */
509     }
510     if (s->scan_offset) {
511         int i;
512
513         put_header(s, USER_START_CODE);
514         for (i = 0; i < sizeof(svcd_scan_offset_placeholder); i++)
515             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
516     }
517     side_data = av_frame_get_side_data(s->current_picture_ptr->f,
518                                        AV_FRAME_DATA_STEREO3D);
519     if (side_data) {
520         AVStereo3D *stereo = (AVStereo3D *)side_data->data;
521         uint8_t fpa_type;
522
523         switch (stereo->type) {
524         case AV_STEREO3D_SIDEBYSIDE:
525             fpa_type = 0x03;
526             break;
527         case AV_STEREO3D_TOPBOTTOM:
528             fpa_type = 0x04;
529             break;
530         case AV_STEREO3D_2D:
531             fpa_type = 0x08;
532             break;
533         case AV_STEREO3D_SIDEBYSIDE_QUINCUNX:
534             fpa_type = 0x23;
535             break;
536         default:
537             fpa_type = 0;
538             break;
539         }
540
541         if (fpa_type != 0) {
542             put_header(s, USER_START_CODE);
543             put_bits(&s->pb, 8, 'J');   // S3D_video_format_signaling_identifier
544             put_bits(&s->pb, 8, 'P');
545             put_bits(&s->pb, 8, '3');
546             put_bits(&s->pb, 8, 'D');
547             put_bits(&s->pb, 8, 0x03);  // S3D_video_format_length
548
549             put_bits(&s->pb, 1, 1);     // reserved_bit
550             put_bits(&s->pb, 7, fpa_type); // S3D_video_format_type
551             put_bits(&s->pb, 8, 0x04);  // reserved_data[0]
552             put_bits(&s->pb, 8, 0xFF);  // reserved_data[1]
553         }
554     }
555
556     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->a53_cc) {
557         side_data = av_frame_get_side_data(s->current_picture_ptr->f,
558             AV_FRAME_DATA_A53_CC);
559         if (side_data) {
560             if (side_data->size <= A53_MAX_CC_COUNT * 3 && side_data->size % 3 == 0) {
561                 int i = 0;
562
563                 put_header (s, USER_START_CODE);
564
565                 put_bits(&s->pb, 8, 'G');                   // user_identifier
566                 put_bits(&s->pb, 8, 'A');
567                 put_bits(&s->pb, 8, '9');
568                 put_bits(&s->pb, 8, '4');
569                 put_bits(&s->pb, 8, 3);                     // user_data_type_code
570                 put_bits(&s->pb, 8,
571                     (side_data->size / 3 & A53_MAX_CC_COUNT) | 0x40); // flags, cc_count
572                 put_bits(&s->pb, 8, 0xff);                  // em_data
573
574                 for (i = 0; i < side_data->size; i++)
575                     put_bits(&s->pb, 8, side_data->data[i]);
576
577                 put_bits(&s->pb, 8, 0xff);                  // marker_bits
578             } else {
579                 av_log(s->avctx, AV_LOG_WARNING,
580                     "Warning Closed Caption size (%d) can not exceed 93 bytes "
581                     "and must be a multiple of 3\n", side_data->size);
582             }
583         }
584     }
585
586     s->mb_y = 0;
587     ff_mpeg1_encode_slice_header(s);
588 }
589
590 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
591                                 int has_mv, int field_motion)
592 {
593     put_bits(&s->pb, n, bits);
594     if (!s->frame_pred_frame_dct) {
595         if (has_mv)
596             /* motion_type: frame/field */
597             put_bits(&s->pb, 2, 2 - field_motion);
598         put_bits(&s->pb, 1, s->interlaced_dct);
599     }
600 }
601
602 // RAL: Parameter added: f_or_b_code
603 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
604 {
605     if (val == 0) {
606         /* zero vector */
607         put_bits(&s->pb,
608                  ff_mpeg12_mbMotionVectorTable[0][1],
609                  ff_mpeg12_mbMotionVectorTable[0][0]);
610     } else {
611         int code, sign, bits;
612         int bit_size = f_or_b_code - 1;
613         int range    = 1 << bit_size;
614         /* modulo encoding */
615         val = sign_extend(val, 5 + bit_size);
616
617         if (val >= 0) {
618             val--;
619             code = (val >> bit_size) + 1;
620             bits = val & (range - 1);
621             sign = 0;
622         } else {
623             val = -val;
624             val--;
625             code = (val >> bit_size) + 1;
626             bits = val & (range - 1);
627             sign = 1;
628         }
629
630         av_assert2(code > 0 && code <= 16);
631
632         put_bits(&s->pb,
633                  ff_mpeg12_mbMotionVectorTable[code][1],
634                  ff_mpeg12_mbMotionVectorTable[code][0]);
635
636         put_bits(&s->pb, 1, sign);
637         if (bit_size > 0)
638             put_bits(&s->pb, bit_size, bits);
639     }
640 }
641
642 static inline void encode_dc(MpegEncContext *s, int diff, int component)
643 {
644     unsigned int diff_u = diff + 255;
645     if (diff_u >= 511) {
646         int index;
647
648         if (diff < 0) {
649             index = av_log2_16bit(-2 * diff);
650             diff--;
651         } else {
652             index = av_log2_16bit(2 * diff);
653         }
654         if (component == 0)
655             put_bits(&s->pb,
656                      ff_mpeg12_vlc_dc_lum_bits[index] + index,
657                      (ff_mpeg12_vlc_dc_lum_code[index] << index) +
658                      av_mod_uintp2(diff, index));
659         else
660             put_bits(&s->pb,
661                      ff_mpeg12_vlc_dc_chroma_bits[index] + index,
662                      (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
663                      av_mod_uintp2(diff, index));
664     } else {
665         if (component == 0)
666             put_bits(&s->pb,
667                      mpeg1_lum_dc_uni[diff + 255] & 0xFF,
668                      mpeg1_lum_dc_uni[diff + 255] >> 8);
669         else
670             put_bits(&s->pb,
671                      mpeg1_chr_dc_uni[diff + 255] & 0xFF,
672                      mpeg1_chr_dc_uni[diff + 255] >> 8);
673     }
674 }
675
676 static void mpeg1_encode_block(MpegEncContext *s, int16_t *block, int n)
677 {
678     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
679     int code, component;
680     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
681
682     last_index = s->block_last_index[n];
683
684     /* DC coef */
685     if (s->mb_intra) {
686         component = (n <= 3 ? 0 : (n & 1) + 1);
687         dc        = block[0];                   /* overflow is impossible */
688         diff      = dc - s->last_dc[component];
689         encode_dc(s, diff, component);
690         s->last_dc[component] = dc;
691         i = 1;
692         if (s->intra_vlc_format)
693             table_vlc = ff_rl_mpeg2.table_vlc;
694     } else {
695         /* encode the first coefficient: needs to be done here because
696          * it is handled slightly differently */
697         level = block[0];
698         if (abs(level) == 1) {
699             code = ((uint32_t)level >> 31);     /* the sign bit */
700             put_bits(&s->pb, 2, code | 0x02);
701             i = 1;
702         } else {
703             i             = 0;
704             last_non_zero = -1;
705             goto next_coef;
706         }
707     }
708
709     /* now quantify & encode AC coefs */
710     last_non_zero = i - 1;
711
712     for (; i <= last_index; i++) {
713         j     = s->intra_scantable.permutated[i];
714         level = block[j];
715
716 next_coef:
717         /* encode using VLC */
718         if (level != 0) {
719             run = i - last_non_zero - 1;
720
721             alevel = level;
722             MASK_ABS(sign, alevel);
723             sign &= 1;
724
725             if (alevel <= mpeg1_max_level[0][run]) {
726                 code = mpeg1_index_run[0][run] + alevel - 1;
727                 /* store the VLC & sign at once */
728                 put_bits(&s->pb, table_vlc[code][1] + 1,
729                          (table_vlc[code][0] << 1) + sign);
730             } else {
731                 /* escape seems to be pretty rare <5% so I do not optimize it */
732                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
733                 /* escape: only clip in this case */
734                 put_bits(&s->pb, 6, run);
735                 if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
736                     if (alevel < 128) {
737                         put_sbits(&s->pb, 8, level);
738                     } else {
739                         if (level < 0)
740                             put_bits(&s->pb, 16, 0x8001 + level + 255);
741                         else
742                             put_sbits(&s->pb, 16, level);
743                     }
744                 } else {
745                     put_sbits(&s->pb, 12, level);
746                 }
747             }
748             last_non_zero = i;
749         }
750     }
751     /* end of block */
752     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
753 }
754
755 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
756                                                       int16_t block[8][64],
757                                                       int motion_x, int motion_y,
758                                                       int mb_block_count)
759 {
760     int i, cbp;
761     const int mb_x     = s->mb_x;
762     const int mb_y     = s->mb_y;
763     const int first_mb = mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
764
765     /* compute cbp */
766     cbp = 0;
767     for (i = 0; i < mb_block_count; i++)
768         if (s->block_last_index[i] >= 0)
769             cbp |= 1 << (mb_block_count - 1 - i);
770
771     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
772         (mb_x != s->mb_width - 1 ||
773          (mb_y != s->end_mb_y - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&
774         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
775          (s->pict_type == AV_PICTURE_TYPE_B && s->mv_dir == s->last_mv_dir &&
776           (((s->mv_dir & MV_DIR_FORWARD)
777             ? ((s->mv[0][0][0] - s->last_mv[0][0][0]) |
778                (s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
779            ((s->mv_dir & MV_DIR_BACKWARD)
780             ? ((s->mv[1][0][0] - s->last_mv[1][0][0]) |
781                (s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
782         s->mb_skip_run++;
783         s->qscale -= s->dquant;
784         s->skip_count++;
785         s->misc_bits++;
786         s->last_bits++;
787         if (s->pict_type == AV_PICTURE_TYPE_P) {
788             s->last_mv[0][0][0] =
789             s->last_mv[0][0][1] =
790             s->last_mv[0][1][0] =
791             s->last_mv[0][1][1] = 0;
792         }
793     } else {
794         if (first_mb) {
795             av_assert0(s->mb_skip_run == 0);
796             encode_mb_skip_run(s, s->mb_x);
797         } else {
798             encode_mb_skip_run(s, s->mb_skip_run);
799         }
800
801         if (s->pict_type == AV_PICTURE_TYPE_I) {
802             if (s->dquant && cbp) {
803                 /* macroblock_type: macroblock_quant = 1 */
804                 put_mb_modes(s, 2, 1, 0, 0);
805                 put_qscale(s);
806             } else {
807                 /* macroblock_type: macroblock_quant = 0 */
808                 put_mb_modes(s, 1, 1, 0, 0);
809                 s->qscale -= s->dquant;
810             }
811             s->misc_bits += get_bits_diff(s);
812             s->i_count++;
813         } else if (s->mb_intra) {
814             if (s->dquant && cbp) {
815                 put_mb_modes(s, 6, 0x01, 0, 0);
816                 put_qscale(s);
817             } else {
818                 put_mb_modes(s, 5, 0x03, 0, 0);
819                 s->qscale -= s->dquant;
820             }
821             s->misc_bits += get_bits_diff(s);
822             s->i_count++;
823             memset(s->last_mv, 0, sizeof(s->last_mv));
824         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
825             if (s->mv_type == MV_TYPE_16X16) {
826                 if (cbp != 0) {
827                     if ((motion_x | motion_y) == 0) {
828                         if (s->dquant) {
829                             /* macroblock_pattern & quant */
830                             put_mb_modes(s, 5, 1, 0, 0);
831                             put_qscale(s);
832                         } else {
833                             /* macroblock_pattern only */
834                             put_mb_modes(s, 2, 1, 0, 0);
835                         }
836                         s->misc_bits += get_bits_diff(s);
837                     } else {
838                         if (s->dquant) {
839                             put_mb_modes(s, 5, 2, 1, 0);    /* motion + cbp */
840                             put_qscale(s);
841                         } else {
842                             put_mb_modes(s, 1, 1, 1, 0);    /* motion + cbp */
843                         }
844                         s->misc_bits += get_bits_diff(s);
845                         // RAL: f_code parameter added
846                         mpeg1_encode_motion(s,
847                                             motion_x - s->last_mv[0][0][0],
848                                             s->f_code);
849                         // RAL: f_code parameter added
850                         mpeg1_encode_motion(s,
851                                             motion_y - s->last_mv[0][0][1],
852                                             s->f_code);
853                         s->mv_bits += get_bits_diff(s);
854                     }
855                 } else {
856                     put_bits(&s->pb, 3, 1);         /* motion only */
857                     if (!s->frame_pred_frame_dct)
858                         put_bits(&s->pb, 2, 2);     /* motion_type: frame */
859                     s->misc_bits += get_bits_diff(s);
860                     // RAL: f_code parameter added
861                     mpeg1_encode_motion(s,
862                                         motion_x - s->last_mv[0][0][0],
863                                         s->f_code);
864                     // RAL: f_code parameter added
865                     mpeg1_encode_motion(s,
866                                         motion_y - s->last_mv[0][0][1],
867                                         s->f_code);
868                     s->qscale  -= s->dquant;
869                     s->mv_bits += get_bits_diff(s);
870                 }
871                 s->last_mv[0][1][0] = s->last_mv[0][0][0] = motion_x;
872                 s->last_mv[0][1][1] = s->last_mv[0][0][1] = motion_y;
873             } else {
874                 av_assert2(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
875
876                 if (cbp) {
877                     if (s->dquant) {
878                         put_mb_modes(s, 5, 2, 1, 1);    /* motion + cbp */
879                         put_qscale(s);
880                     } else {
881                         put_mb_modes(s, 1, 1, 1, 1);    /* motion + cbp */
882                     }
883                 } else {
884                     put_bits(&s->pb, 3, 1);             /* motion only */
885                     put_bits(&s->pb, 2, 1);             /* motion_type: field */
886                     s->qscale -= s->dquant;
887                 }
888                 s->misc_bits += get_bits_diff(s);
889                 for (i = 0; i < 2; i++) {
890                     put_bits(&s->pb, 1, s->field_select[0][i]);
891                     mpeg1_encode_motion(s,
892                                         s->mv[0][i][0] - s->last_mv[0][i][0],
893                                         s->f_code);
894                     mpeg1_encode_motion(s,
895                                         s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
896                                         s->f_code);
897                     s->last_mv[0][i][0] = s->mv[0][i][0];
898                     s->last_mv[0][i][1] = 2 * s->mv[0][i][1];
899                 }
900                 s->mv_bits += get_bits_diff(s);
901             }
902             if (cbp) {
903                 if (s->chroma_y_shift) {
904                     put_bits(&s->pb,
905                              ff_mpeg12_mbPatTable[cbp][1],
906                              ff_mpeg12_mbPatTable[cbp][0]);
907                 } else {
908                     put_bits(&s->pb,
909                              ff_mpeg12_mbPatTable[cbp >> 2][1],
910                              ff_mpeg12_mbPatTable[cbp >> 2][0]);
911                     put_sbits(&s->pb, 2, cbp);
912                 }
913             }
914             s->f_count++;
915         } else {
916             if (s->mv_type == MV_TYPE_16X16) {
917                 if (cbp) {                      // With coded bloc pattern
918                     if (s->dquant) {
919                         if (s->mv_dir == MV_DIR_FORWARD)
920                             put_mb_modes(s, 6, 3, 1, 0);
921                         else
922                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 0);
923                         put_qscale(s);
924                     } else {
925                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 0);
926                     }
927                 } else {                        // No coded bloc pattern
928                     put_bits(&s->pb, 5 - s->mv_dir, 2);
929                     if (!s->frame_pred_frame_dct)
930                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
931                     s->qscale -= s->dquant;
932                 }
933                 s->misc_bits += get_bits_diff(s);
934                 if (s->mv_dir & MV_DIR_FORWARD) {
935                     mpeg1_encode_motion(s,
936                                         s->mv[0][0][0] - s->last_mv[0][0][0],
937                                         s->f_code);
938                     mpeg1_encode_motion(s,
939                                         s->mv[0][0][1] - s->last_mv[0][0][1],
940                                         s->f_code);
941                     s->last_mv[0][0][0] =
942                     s->last_mv[0][1][0] = s->mv[0][0][0];
943                     s->last_mv[0][0][1] =
944                     s->last_mv[0][1][1] = s->mv[0][0][1];
945                     s->f_count++;
946                 }
947                 if (s->mv_dir & MV_DIR_BACKWARD) {
948                     mpeg1_encode_motion(s,
949                                         s->mv[1][0][0] - s->last_mv[1][0][0],
950                                         s->b_code);
951                     mpeg1_encode_motion(s,
952                                         s->mv[1][0][1] - s->last_mv[1][0][1],
953                                         s->b_code);
954                     s->last_mv[1][0][0] =
955                     s->last_mv[1][1][0] = s->mv[1][0][0];
956                     s->last_mv[1][0][1] =
957                     s->last_mv[1][1][1] = s->mv[1][0][1];
958                     s->b_count++;
959                 }
960             } else {
961                 av_assert2(s->mv_type == MV_TYPE_FIELD);
962                 av_assert2(!s->frame_pred_frame_dct);
963                 if (cbp) {                      // With coded bloc pattern
964                     if (s->dquant) {
965                         if (s->mv_dir == MV_DIR_FORWARD)
966                             put_mb_modes(s, 6, 3, 1, 1);
967                         else
968                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 1);
969                         put_qscale(s);
970                     } else {
971                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 1);
972                     }
973                 } else {                        // No coded bloc pattern
974                     put_bits(&s->pb, 5 - s->mv_dir, 2);
975                     put_bits(&s->pb, 2, 1);     /* motion_type: field */
976                     s->qscale -= s->dquant;
977                 }
978                 s->misc_bits += get_bits_diff(s);
979                 if (s->mv_dir & MV_DIR_FORWARD) {
980                     for (i = 0; i < 2; i++) {
981                         put_bits(&s->pb, 1, s->field_select[0][i]);
982                         mpeg1_encode_motion(s,
983                                             s->mv[0][i][0] - s->last_mv[0][i][0],
984                                             s->f_code);
985                         mpeg1_encode_motion(s,
986                                             s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
987                                             s->f_code);
988                         s->last_mv[0][i][0] = s->mv[0][i][0];
989                         s->last_mv[0][i][1] = s->mv[0][i][1] * 2;
990                     }
991                     s->f_count++;
992                 }
993                 if (s->mv_dir & MV_DIR_BACKWARD) {
994                     for (i = 0; i < 2; i++) {
995                         put_bits(&s->pb, 1, s->field_select[1][i]);
996                         mpeg1_encode_motion(s,
997                                             s->mv[1][i][0] - s->last_mv[1][i][0],
998                                             s->b_code);
999                         mpeg1_encode_motion(s,
1000                                             s->mv[1][i][1] - (s->last_mv[1][i][1] >> 1),
1001                                             s->b_code);
1002                         s->last_mv[1][i][0] = s->mv[1][i][0];
1003                         s->last_mv[1][i][1] = s->mv[1][i][1] * 2;
1004                     }
1005                     s->b_count++;
1006                 }
1007             }
1008             s->mv_bits += get_bits_diff(s);
1009             if (cbp) {
1010                 if (s->chroma_y_shift) {
1011                     put_bits(&s->pb,
1012                              ff_mpeg12_mbPatTable[cbp][1],
1013                              ff_mpeg12_mbPatTable[cbp][0]);
1014                 } else {
1015                     put_bits(&s->pb,
1016                              ff_mpeg12_mbPatTable[cbp >> 2][1],
1017                              ff_mpeg12_mbPatTable[cbp >> 2][0]);
1018                     put_sbits(&s->pb, 2, cbp);
1019                 }
1020             }
1021         }
1022         for (i = 0; i < mb_block_count; i++)
1023             if (cbp & (1 << (mb_block_count - 1 - i)))
1024                 mpeg1_encode_block(s, block[i], i);
1025         s->mb_skip_run = 0;
1026         if (s->mb_intra)
1027             s->i_tex_bits += get_bits_diff(s);
1028         else
1029             s->p_tex_bits += get_bits_diff(s);
1030     }
1031 }
1032
1033 void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64],
1034                         int motion_x, int motion_y)
1035 {
1036     if (s->chroma_format == CHROMA_420)
1037         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
1038     else
1039         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
1040 }
1041
1042 static av_cold void mpeg12_encode_init_static(void)
1043 {
1044     static uint8_t mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
1045
1046     ff_rl_init(&ff_rl_mpeg1, mpeg12_static_rl_table_store[0]);
1047     ff_rl_init(&ff_rl_mpeg2, mpeg12_static_rl_table_store[1]);
1048
1049     for (int i = 0; i < 64; i++) {
1050         mpeg1_max_level[0][i] = ff_rl_mpeg1.max_level[0][i];
1051         mpeg1_index_run[0][i] = ff_rl_mpeg1.index_run[0][i];
1052     }
1053
1054     ff_mpeg1_init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
1055     ff_mpeg1_init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
1056
1057     /* build unified dc encoding tables */
1058     for (int i = -255; i < 256; i++) {
1059         int adiff, index;
1060         int bits, code;
1061         int diff = i;
1062
1063         adiff = FFABS(diff);
1064         if (diff < 0)
1065             diff--;
1066         index = av_log2(2 * adiff);
1067
1068         bits = ff_mpeg12_vlc_dc_lum_bits[index] + index;
1069         code = (ff_mpeg12_vlc_dc_lum_code[index] << index) +
1070                av_mod_uintp2(diff, index);
1071         mpeg1_lum_dc_uni[i + 255] = bits + (code << 8);
1072
1073         bits = ff_mpeg12_vlc_dc_chroma_bits[index] + index;
1074         code = (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
1075                av_mod_uintp2(diff, index);
1076         mpeg1_chr_dc_uni[i + 255] = bits + (code << 8);
1077     }
1078
1079     for (int f_code = 1; f_code <= MAX_FCODE; f_code++)
1080         for (int mv = -MAX_DMV; mv <= MAX_DMV; mv++) {
1081             int len;
1082
1083             if (mv == 0) {
1084                 len = ff_mpeg12_mbMotionVectorTable[0][1];
1085             } else {
1086                 int val, bit_size, code;
1087
1088                 bit_size = f_code - 1;
1089
1090                 val = mv;
1091                 if (val < 0)
1092                     val = -val;
1093                 val--;
1094                 code = (val >> bit_size) + 1;
1095                 if (code < 17)
1096                     len = ff_mpeg12_mbMotionVectorTable[code][1] +
1097                           1 + bit_size;
1098                 else
1099                     len = ff_mpeg12_mbMotionVectorTable[16][1] +
1100                           2 + bit_size;
1101             }
1102
1103             mv_penalty[f_code][mv + MAX_DMV] = len;
1104         }
1105
1106
1107     for (int f_code = MAX_FCODE; f_code > 0; f_code--)
1108         for (int mv = -(8 << f_code); mv < (8 << f_code); mv++)
1109             fcode_tab[mv + MAX_MV] = f_code;
1110 }
1111
1112 av_cold void ff_mpeg1_encode_init(MpegEncContext *s)
1113 {
1114     static AVOnce init_static_once = AV_ONCE_INIT;
1115
1116     ff_mpeg12_common_init(s);
1117
1118     s->me.mv_penalty = mv_penalty;
1119     s->fcode_tab     = fcode_tab;
1120     if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1121         s->min_qcoeff = -255;
1122         s->max_qcoeff = 255;
1123     } else {
1124         s->min_qcoeff = -2047;
1125         s->max_qcoeff = 2047;
1126     }
1127     if (s->intra_vlc_format) {
1128         s->intra_ac_vlc_length      =
1129         s->intra_ac_vlc_last_length = uni_mpeg2_ac_vlc_len;
1130     } else {
1131         s->intra_ac_vlc_length      =
1132         s->intra_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
1133     }
1134     s->inter_ac_vlc_length      =
1135     s->inter_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
1136
1137     ff_thread_once(&init_static_once, mpeg12_encode_init_static);
1138 }
1139
1140 #define OFFSET(x) offsetof(MpegEncContext, x)
1141 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
1142 #define COMMON_OPTS                                                           \
1143     { "gop_timecode",        "MPEG GOP Timecode in hh:mm:ss[:;.]ff format. Overrides timecode_frame_start.",   \
1144       OFFSET(tc_opt_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, VE },\
1145     { "drop_frame_timecode", "Timecode is in drop frame format.",             \
1146       OFFSET(drop_frame_timecode), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE }, \
1147     { "scan_offset",         "Reserve space for SVCD scan offset user data.", \
1148       OFFSET(scan_offset),         AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE }, \
1149     { "timecode_frame_start", "GOP timecode frame start number, in non-drop-frame format", \
1150       OFFSET(timecode_frame_start), AV_OPT_TYPE_INT64, {.i64 = -1 }, -1, INT64_MAX, VE}, \
1151
1152 static const AVOption mpeg1_options[] = {
1153     COMMON_OPTS
1154     FF_MPV_COMMON_OPTS
1155     { NULL },
1156 };
1157
1158 static const AVOption mpeg2_options[] = {
1159     COMMON_OPTS
1160     { "intra_vlc",        "Use MPEG-2 intra VLC table.",
1161       OFFSET(intra_vlc_format),    AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
1162     { "non_linear_quant", "Use nonlinear quantizer.",    OFFSET(q_scale_type),   AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
1163     { "alternate_scan",   "Enable alternate scantable.", OFFSET(alternate_scan), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
1164     { "seq_disp_ext",     "Write sequence_display_extension blocks.", OFFSET(seq_disp_ext), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE, "seq_disp_ext" },
1165     {     "auto",   NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = -1},  0, 0, VE, "seq_disp_ext" },
1166     {     "never",  NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = 0 },  0, 0, VE, "seq_disp_ext" },
1167     {     "always", NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = 1 },  0, 0, VE, "seq_disp_ext" },
1168     { "video_format",     "Video_format in the sequence_display_extension indicating the source of the video.", OFFSET(video_format), AV_OPT_TYPE_INT, { .i64 = VIDEO_FORMAT_UNSPECIFIED }, 0, 7, VE, "video_format" },
1169     {     "component",    NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = VIDEO_FORMAT_COMPONENT  },  0, 0, VE, "video_format" },
1170     {     "pal",          NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = VIDEO_FORMAT_PAL        },  0, 0, VE, "video_format" },
1171     {     "ntsc",         NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = VIDEO_FORMAT_NTSC       },  0, 0, VE, "video_format" },
1172     {     "secam",        NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = VIDEO_FORMAT_SECAM      },  0, 0, VE, "video_format" },
1173     {     "mac",          NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = VIDEO_FORMAT_MAC        },  0, 0, VE, "video_format" },
1174     {     "unspecified",  NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = VIDEO_FORMAT_UNSPECIFIED},  0, 0, VE, "video_format" },
1175 #define LEVEL(name, value) name, NULL, 0, AV_OPT_TYPE_CONST, { .i64 = value }, 0, 0, VE, "avctx.level"
1176     { LEVEL("high",     4) },
1177     { LEVEL("high1440", 6) },
1178     { LEVEL("main",     8) },
1179     { LEVEL("low",     10) },
1180 #undef LEVEL
1181     FF_MPV_COMMON_OPTS
1182     FF_MPEG2_PROFILE_OPTS
1183     { NULL },
1184 };
1185
1186 #define mpeg12_class(x)                                 \
1187 static const AVClass mpeg ## x ## _class = {            \
1188     .class_name = "mpeg" # x "video encoder",           \
1189     .item_name  = av_default_item_name,                 \
1190     .option     = mpeg ## x ## _options,                \
1191     .version    = LIBAVUTIL_VERSION_INT,                \
1192 };
1193
1194 mpeg12_class(1)
1195 mpeg12_class(2)
1196
1197 AVCodec ff_mpeg1video_encoder = {
1198     .name                 = "mpeg1video",
1199     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
1200     .type                 = AVMEDIA_TYPE_VIDEO,
1201     .id                   = AV_CODEC_ID_MPEG1VIDEO,
1202     .priv_data_size       = sizeof(MpegEncContext),
1203     .init                 = encode_init,
1204     .encode2              = ff_mpv_encode_picture,
1205     .close                = ff_mpv_encode_end,
1206     .supported_framerates = ff_mpeg12_frame_rate_tab + 1,
1207     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1208                                                            AV_PIX_FMT_NONE },
1209     .capabilities         = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
1210     .caps_internal        = FF_CODEC_CAP_INIT_CLEANUP,
1211     .priv_class           = &mpeg1_class,
1212 };
1213
1214 AVCodec ff_mpeg2video_encoder = {
1215     .name                 = "mpeg2video",
1216     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
1217     .type                 = AVMEDIA_TYPE_VIDEO,
1218     .id                   = AV_CODEC_ID_MPEG2VIDEO,
1219     .priv_data_size       = sizeof(MpegEncContext),
1220     .init                 = encode_init,
1221     .encode2              = ff_mpv_encode_picture,
1222     .close                = ff_mpv_encode_end,
1223     .supported_framerates = ff_mpeg2_frame_rate_tab,
1224     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1225                                                            AV_PIX_FMT_YUV422P,
1226                                                            AV_PIX_FMT_NONE },
1227     .capabilities         = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
1228     .caps_internal        = FF_CODEC_CAP_INIT_CLEANUP,
1229     .priv_class           = &mpeg2_class,
1230 };
1231 #endif /* CONFIG_MPEG1VIDEO_ENCODER || CONFIG_MPEG2VIDEO_ENCODER */