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Move 2 variable declarations to inside of loop.
[FFMpeg-mirror/lagarith.git] / libavcodec / mpeg12enc.c
blob350fa4016bcb48b743295a587cae0649584332d1
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 libavcodec/mpeg12enc.c
25 * MPEG1/2 encoder
26 */
27
28 #include "avcodec.h"
29 #include "dsputil.h"
30 #include "mpegvideo.h"
31
32 #include "mpeg12.h"
33 #include "mpeg12data.h"
34 #include "bytestream.h"
35
36
37 static const uint8_t inv_non_linear_qscale[13] = {
38 0, 2, 4, 6, 8,
39 9,10,11,12,13,14,15,16,
40 };
41
42 static const uint8_t svcd_scan_offset_placeholder[14] = {
43 0x10, 0x0E,
44 0x00, 0x80, 0x81,
45 0x00, 0x80, 0x81,
46 0xff, 0xff, 0xff,
47 0xff, 0xff, 0xff,
48 };
49
50 static void mpeg1_encode_block(MpegEncContext *s,
51 DCTELEM *block,
52 int component);
53 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code); // RAL: f_code parameter added
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 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 static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
69 int i;
70
71 for(i=0; i<128; i++){
72 int level= i-64;
73 int run;
74 for(run=0; run<64; run++){
75 int len, bits, code;
76
77 int alevel= FFABS(level);
78 int sign= (level>>31)&1;
79
80 if (alevel > rl->max_level[0][run])
81 code= 111; /*rl->n*/
82 else
83 code= rl->index_run[0][run] + alevel - 1;
84
85 if (code < 111 /* rl->n */) {
86 /* store the vlc & sign at once */
87 len= rl->table_vlc[code][1]+1;
88 bits= (rl->table_vlc[code][0]<<1) + sign;
89 } else {
90 len= rl->table_vlc[111/*rl->n*/][1]+6;
91 bits= rl->table_vlc[111/*rl->n*/][0]<<6;
92
93 bits|= run;
94 if (alevel < 128) {
95 bits<<=8; len+=8;
96 bits|= level & 0xff;
97 } else {
98 bits<<=16; len+=16;
99 bits|= level & 0xff;
100 if (level < 0) {
101 bits|= 0x8001 + level + 255;
102 } else {
103 bits|= level & 0xffff;
104 }
105 }
106 }
107
108 uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
109 }
110 }
111 }
112
113
114 static int find_frame_rate_index(MpegEncContext *s){
115 int i;
116 int64_t dmin= INT64_MAX;
117 int64_t d;
118
119 for(i=1;i<14;i++) {
120 int64_t n0= 1001LL/ff_frame_rate_tab[i].den*ff_frame_rate_tab[i].num*s->avctx->time_base.num;
121 int64_t n1= 1001LL*s->avctx->time_base.den;
122 if(s->avctx->strict_std_compliance > FF_COMPLIANCE_INOFFICIAL && i>=9) break;
123
124 d = FFABS(n0 - n1);
125 if(d < dmin){
126 dmin=d;
127 s->frame_rate_index= i;
128 }
129 }
130 if(dmin)
131 return -1;
132 else
133 return 0;
134 }
135
136 static av_cold int encode_init(AVCodecContext *avctx)
137 {
138 MpegEncContext *s = avctx->priv_data;
139
140 if(MPV_encode_init(avctx) < 0)
141 return -1;
142
143 if(find_frame_rate_index(s) < 0){
144 if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
145 av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
146 return -1;
147 }else{
148 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);
149 }
150 }
151
152 if(avctx->profile == FF_PROFILE_UNKNOWN){
153 if(avctx->level != FF_LEVEL_UNKNOWN){
154 av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
155 return -1;
156 }
157 avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
158 }
159
160 if(avctx->level == FF_LEVEL_UNKNOWN){
161 if(avctx->profile == 0){ /* 4:2:2 */
162 if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
163 else avctx->level = 2; /* High */
164 }else{
165 if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
166 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
167 return -1;
168 }
169 if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
170 else if(avctx->width <= 1440) avctx->level = 6; /* High 1440 */
171 else avctx->level = 4; /* High */
172 }
173 }
174
175 if((avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE) && s->frame_rate_index != 4){
176 av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
177 return -1;
178 }
179
180 return 0;
181 }
182
183 static void put_header(MpegEncContext *s, int header)
184 {
185 align_put_bits(&s->pb);
186 put_bits(&s->pb, 16, header>>16);
187 put_sbits(&s->pb, 16, header);
188 }
189
190 /* put sequence header if needed */
191 static void mpeg1_encode_sequence_header(MpegEncContext *s)
192 {
193 unsigned int vbv_buffer_size;
194 unsigned int fps, v;
195 int i;
196 uint64_t time_code;
197 float best_aspect_error= 1E10;
198 float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
199 int constraint_parameter_flag;
200
201 if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
202
203 if (s->current_picture.key_frame) {
204 AVRational framerate= ff_frame_rate_tab[s->frame_rate_index];
205
206 /* mpeg1 header repeated every gop */
207 put_header(s, SEQ_START_CODE);
208
209 put_sbits(&s->pb, 12, s->width );
210 put_sbits(&s->pb, 12, s->height);
211
212 for(i=1; i<15; i++){
213 float error= aspect_ratio;
214 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
215 error-= 1.0/ff_mpeg1_aspect[i];
216 else
217 error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
218
219 error= FFABS(error);
220
221 if(error < best_aspect_error){
222 best_aspect_error= error;
223 s->aspect_ratio_info= i;
224 }
225 }
226
227 put_bits(&s->pb, 4, s->aspect_ratio_info);
228 put_bits(&s->pb, 4, s->frame_rate_index);
229
230 if(s->avctx->rc_max_rate){
231 v = (s->avctx->rc_max_rate + 399) / 400;
232 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
233 v = 0x3ffff;
234 }else{
235 v= 0x3FFFF;
236 }
237
238 if(s->avctx->rc_buffer_size)
239 vbv_buffer_size = s->avctx->rc_buffer_size;
240 else
241 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
242 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
243 vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
244
245 put_sbits(&s->pb, 18, v);
246 put_bits(&s->pb, 1, 1); /* marker */
247 put_sbits(&s->pb, 10, vbv_buffer_size);
248
249 constraint_parameter_flag=
250 s->width <= 768 && s->height <= 576 &&
251 s->mb_width * s->mb_height <= 396 &&
252 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
253 framerate.num <= framerate.den*30 &&
254 s->avctx->me_range && s->avctx->me_range < 128 &&
255 vbv_buffer_size <= 20 &&
256 v <= 1856000/400 &&
257 s->codec_id == CODEC_ID_MPEG1VIDEO;
258
259 put_bits(&s->pb, 1, constraint_parameter_flag);
260
261 ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
262 ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
263
264 if(s->codec_id == CODEC_ID_MPEG2VIDEO){
265 put_header(s, EXT_START_CODE);
266 put_bits(&s->pb, 4, 1); //seq ext
267
268 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
269
270 put_bits(&s->pb, 3, s->avctx->profile); //profile
271 put_bits(&s->pb, 4, s->avctx->level); //level
272
273 put_bits(&s->pb, 1, s->progressive_sequence);
274 put_bits(&s->pb, 2, s->chroma_format);
275 put_bits(&s->pb, 2, s->width >>12);
276 put_bits(&s->pb, 2, s->height>>12);
277 put_bits(&s->pb, 12, v>>18); //bitrate ext
278 put_bits(&s->pb, 1, 1); //marker
279 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
280 put_bits(&s->pb, 1, s->low_delay);
281 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
282 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
283 }
284
285 put_header(s, GOP_START_CODE);
286 put_bits(&s->pb, 1, !!(s->avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE)); /* drop frame flag */
287 /* time code : we must convert from the real frame rate to a
288 fake mpeg frame rate in case of low frame rate */
289 fps = (framerate.num + framerate.den/2)/ framerate.den;
290 time_code = s->current_picture_ptr->coded_picture_number + s->avctx->timecode_frame_start;
291
292 s->gop_picture_number = s->current_picture_ptr->coded_picture_number;
293 if (s->avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE) {
294 /* only works for NTSC 29.97 */
295 int d = time_code / 17982;
296 int m = time_code % 17982;
297 //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
298 time_code += 18 * d + 2 * ((m - 2) / 1798);
299 }
300 put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
301 put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
302 put_bits(&s->pb, 1, 1);
303 put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
304 put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
305 put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
306 put_bits(&s->pb, 1, 0); /* broken link */
307 }
308 }
309
310 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
311 while (run >= 33) {
312 put_bits(&s->pb, 11, 0x008);
313 run -= 33;
314 }
315 put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
316 ff_mpeg12_mbAddrIncrTable[run][0]);
317 }
318
319 static av_always_inline void put_qscale(MpegEncContext *s)
320 {
321 if(s->q_scale_type){
322 assert(s->qscale>=1 && s->qscale <=12);
323 put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
324 }else{
325 put_bits(&s->pb, 5, s->qscale);
326 }
327 }
328
329 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
330 if (s->height > 2800) {
331 put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
332 put_bits(&s->pb, 3, s->mb_y >> 7); /* slice_vertical_position_extension */
333 } else {
334 put_header(s, SLICE_MIN_START_CODE + s->mb_y);
335 }
336 put_qscale(s);
337 put_bits(&s->pb, 1, 0); /* slice extra information */
338 }
339
340 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
341 {
342 mpeg1_encode_sequence_header(s);
343
344 /* mpeg1 picture header */
345 put_header(s, PICTURE_START_CODE);
346 /* temporal reference */
347
348 // RAL: s->picture_number instead of s->fake_picture_number
349 put_bits(&s->pb, 10, (s->picture_number -
350 s->gop_picture_number) & 0x3ff);
351 put_bits(&s->pb, 3, s->pict_type);
352
353 s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
354 put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
355
356 // RAL: Forward f_code also needed for B frames
357 if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
358 put_bits(&s->pb, 1, 0); /* half pel coordinates */
359 if(s->codec_id == CODEC_ID_MPEG1VIDEO)
360 put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
361 else
362 put_bits(&s->pb, 3, 7); /* forward_f_code */
363 }
364
365 // RAL: Backward f_code necessary for B frames
366 if (s->pict_type == FF_B_TYPE) {
367 put_bits(&s->pb, 1, 0); /* half pel coordinates */
368 if(s->codec_id == CODEC_ID_MPEG1VIDEO)
369 put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
370 else
371 put_bits(&s->pb, 3, 7); /* backward_f_code */
372 }
373
374 put_bits(&s->pb, 1, 0); /* extra bit picture */
375
376 s->frame_pred_frame_dct = 1;
377 if(s->codec_id == CODEC_ID_MPEG2VIDEO){
378 put_header(s, EXT_START_CODE);
379 put_bits(&s->pb, 4, 8); //pic ext
380 if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
381 put_bits(&s->pb, 4, s->f_code);
382 put_bits(&s->pb, 4, s->f_code);
383 }else{
384 put_bits(&s->pb, 8, 255);
385 }
386 if (s->pict_type == FF_B_TYPE) {
387 put_bits(&s->pb, 4, s->b_code);
388 put_bits(&s->pb, 4, s->b_code);
389 }else{
390 put_bits(&s->pb, 8, 255);
391 }
392 put_bits(&s->pb, 2, s->intra_dc_precision);
393
394 assert(s->picture_structure == PICT_FRAME);
395 put_bits(&s->pb, 2, s->picture_structure);
396 if (s->progressive_sequence) {
397 put_bits(&s->pb, 1, 0); /* no repeat */
398 } else {
399 put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
400 }
401 /* XXX: optimize the generation of this flag with entropy
402 measures */
403 s->frame_pred_frame_dct = s->progressive_sequence;
404
405 put_bits(&s->pb, 1, s->frame_pred_frame_dct);
406 put_bits(&s->pb, 1, s->concealment_motion_vectors);
407 put_bits(&s->pb, 1, s->q_scale_type);
408 put_bits(&s->pb, 1, s->intra_vlc_format);
409 put_bits(&s->pb, 1, s->alternate_scan);
410 put_bits(&s->pb, 1, s->repeat_first_field);
411 s->progressive_frame = s->progressive_sequence;
412 put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
413 put_bits(&s->pb, 1, s->progressive_frame);
414 put_bits(&s->pb, 1, 0); //composite_display_flag
415 }
416 if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
417 int i;
418
419 put_header(s, USER_START_CODE);
420 for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
421 put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
422 }
423 }
424
425 s->mb_y=0;
426 ff_mpeg1_encode_slice_header(s);
427 }
428
429 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
430 int has_mv, int field_motion)
431 {
432 put_bits(&s->pb, n, bits);
433 if (!s->frame_pred_frame_dct) {
434 if (has_mv)
435 put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
436 put_bits(&s->pb, 1, s->interlaced_dct);
437 }
438 }
439
440 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
441 DCTELEM block[6][64],
442 int motion_x, int motion_y,
443 int mb_block_count)
444 {
445 int i, cbp;
446 const int mb_x = s->mb_x;
447 const int mb_y = s->mb_y;
448 const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
449
450 /* compute cbp */
451 cbp = 0;
452 for(i=0;i<mb_block_count;i++) {
453 if (s->block_last_index[i] >= 0)
454 cbp |= 1 << (mb_block_count - 1 - i);
455 }
456
457 if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
458 (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
459 ((s->pict_type == FF_P_TYPE && (motion_x | motion_y) == 0) ||
460 (s->pict_type == FF_B_TYPE && 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) |
461 ((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))) {
462 s->mb_skip_run++;
463 s->qscale -= s->dquant;
464 s->skip_count++;
465 s->misc_bits++;
466 s->last_bits++;
467 if(s->pict_type == FF_P_TYPE){
468 s->last_mv[0][1][0]= s->last_mv[0][0][0]=
469 s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
470 }
471 } else {
472 if(first_mb){
473 assert(s->mb_skip_run == 0);
474 encode_mb_skip_run(s, s->mb_x);
475 }else{
476 encode_mb_skip_run(s, s->mb_skip_run);
477 }
478
479 if (s->pict_type == FF_I_TYPE) {
480 if(s->dquant && cbp){
481 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
482 put_qscale(s);
483 }else{
484 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
485 s->qscale -= s->dquant;
486 }
487 s->misc_bits+= get_bits_diff(s);
488 s->i_count++;
489 } else if (s->mb_intra) {
490 if(s->dquant && cbp){
491 put_mb_modes(s, 6, 0x01, 0, 0);
492 put_qscale(s);
493 }else{
494 put_mb_modes(s, 5, 0x03, 0, 0);
495 s->qscale -= s->dquant;
496 }
497 s->misc_bits+= get_bits_diff(s);
498 s->i_count++;
499 memset(s->last_mv, 0, sizeof(s->last_mv));
500 } else if (s->pict_type == FF_P_TYPE) {
501 if(s->mv_type == MV_TYPE_16X16){
502 if (cbp != 0) {
503 if ((motion_x|motion_y) == 0) {
504 if(s->dquant){
505 put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
506 put_qscale(s);
507 }else{
508 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
509 }
510 s->misc_bits+= get_bits_diff(s);
511 } else {
512 if(s->dquant){
513 put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
514 put_qscale(s);
515 }else{
516 put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
517 }
518 s->misc_bits+= get_bits_diff(s);
519 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
520 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
521 s->mv_bits+= get_bits_diff(s);
522 }
523 } else {
524 put_bits(&s->pb, 3, 1); /* motion only */
525 if (!s->frame_pred_frame_dct)
526 put_bits(&s->pb, 2, 2); /* motion_type: frame */
527 s->misc_bits+= get_bits_diff(s);
528 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
529 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
530 s->qscale -= s->dquant;
531 s->mv_bits+= get_bits_diff(s);
532 }
533 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
534 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
535 }else{
536 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
537
538 if (cbp) {
539 if(s->dquant){
540 put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
541 put_qscale(s);
542 }else{
543 put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
544 }
545 } else {
546 put_bits(&s->pb, 3, 1); /* motion only */
547 put_bits(&s->pb, 2, 1); /* motion_type: field */
548 s->qscale -= s->dquant;
549 }
550 s->misc_bits+= get_bits_diff(s);
551 for(i=0; i<2; i++){
552 put_bits(&s->pb, 1, s->field_select[0][i]);
553 mpeg1_encode_motion(s, s->mv[0][i][0] - s->last_mv[0][i][0] , s->f_code);
554 mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
555 s->last_mv[0][i][0]= s->mv[0][i][0];
556 s->last_mv[0][i][1]= 2*s->mv[0][i][1];
557 }
558 s->mv_bits+= get_bits_diff(s);
559 }
560 if(cbp) {
561 if (s->chroma_y_shift) {
562 put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
563 } else {
564 put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
565 put_sbits(&s->pb, 2, cbp);
566 }
567 }
568 s->f_count++;
569 } else{
570 if(s->mv_type == MV_TYPE_16X16){
571 if (cbp){ // With coded bloc pattern
572 if (s->dquant) {
573 if(s->mv_dir == MV_DIR_FORWARD)
574 put_mb_modes(s, 6, 3, 1, 0);
575 else
576 put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
577 put_qscale(s);
578 } else {
579 put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
580 }
581 }else{ // No coded bloc pattern
582 put_bits(&s->pb, 5-s->mv_dir, 2);
583 if (!s->frame_pred_frame_dct)
584 put_bits(&s->pb, 2, 2); /* motion_type: frame */
585 s->qscale -= s->dquant;
586 }
587 s->misc_bits += get_bits_diff(s);
588 if (s->mv_dir&MV_DIR_FORWARD){
589 mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
590 mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
591 s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
592 s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
593 s->f_count++;
594 }
595 if (s->mv_dir&MV_DIR_BACKWARD){
596 mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
597 mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
598 s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
599 s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
600 s->b_count++;
601 }
602 }else{
603 assert(s->mv_type == MV_TYPE_FIELD);
604 assert(!s->frame_pred_frame_dct);
605 if (cbp){ // With coded bloc pattern
606 if (s->dquant) {
607 if(s->mv_dir == MV_DIR_FORWARD)
608 put_mb_modes(s, 6, 3, 1, 1);
609 else
610 put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
611 put_qscale(s);
612 } else {
613 put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
614 }
615 }else{ // No coded bloc pattern
616 put_bits(&s->pb, 5-s->mv_dir, 2);
617 put_bits(&s->pb, 2, 1); /* motion_type: field */
618 s->qscale -= s->dquant;
619 }
620 s->misc_bits += get_bits_diff(s);
621 if (s->mv_dir&MV_DIR_FORWARD){
622 for(i=0; i<2; i++){
623 put_bits(&s->pb, 1, s->field_select[0][i]);
624 mpeg1_encode_motion(s, s->mv[0][i][0] - s->last_mv[0][i][0] , s->f_code);
625 mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
626 s->last_mv[0][i][0]= s->mv[0][i][0];
627 s->last_mv[0][i][1]= 2*s->mv[0][i][1];
628 }
629 s->f_count++;
630 }
631 if (s->mv_dir&MV_DIR_BACKWARD){
632 for(i=0; i<2; i++){
633 put_bits(&s->pb, 1, s->field_select[1][i]);
634 mpeg1_encode_motion(s, s->mv[1][i][0] - s->last_mv[1][i][0] , s->b_code);
635 mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
636 s->last_mv[1][i][0]= s->mv[1][i][0];
637 s->last_mv[1][i][1]= 2*s->mv[1][i][1];
638 }
639 s->b_count++;
640 }
641 }
642 s->mv_bits += get_bits_diff(s);
643 if(cbp) {
644 if (s->chroma_y_shift) {
645 put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
646 } else {
647 put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
648 put_sbits(&s->pb, 2, cbp);
649 }
650 }
651 }
652 for(i=0;i<mb_block_count;i++) {
653 if (cbp & (1 << (mb_block_count - 1 - i))) {
654 mpeg1_encode_block(s, block[i], i);
655 }
656 }
657 s->mb_skip_run = 0;
658 if(s->mb_intra)
659 s->i_tex_bits+= get_bits_diff(s);
660 else
661 s->p_tex_bits+= get_bits_diff(s);
662 }
663 }
664
665 void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
666 {
667 if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
668 else mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
669 }
670
671 // RAL: Parameter added: f_or_b_code
672 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
673 {
674 if (val == 0) {
675 /* zero vector */
676 put_bits(&s->pb,
677 ff_mpeg12_mbMotionVectorTable[0][1],
678 ff_mpeg12_mbMotionVectorTable[0][0]);
679 } else {
680 int code, sign, bits;
681 int bit_size = f_or_b_code - 1;
682 int range = 1 << bit_size;
683 /* modulo encoding */
684 int l= INT_BIT - 5 - bit_size;
685 val= (val<<l)>>l;
686
687 if (val >= 0) {
688 val--;
689 code = (val >> bit_size) + 1;
690 bits = val & (range - 1);
691 sign = 0;
692 } else {
693 val = -val;
694 val--;
695 code = (val >> bit_size) + 1;
696 bits = val & (range - 1);
697 sign = 1;
698 }
699
700 assert(code > 0 && code <= 16);
701
702 put_bits(&s->pb,
703 ff_mpeg12_mbMotionVectorTable[code][1],
704 ff_mpeg12_mbMotionVectorTable[code][0]);
705
706 put_bits(&s->pb, 1, sign);
707 if (bit_size > 0) {
708 put_bits(&s->pb, bit_size, bits);
709 }
710 }
711 }
712
713 void ff_mpeg1_encode_init(MpegEncContext *s)
714 {
715 static int done=0;
716
717 ff_mpeg12_common_init(s);
718
719 if(!done){
720 int f_code;
721 int mv;
722 int i;
723
724 done=1;
725 init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
726 init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
727
728 for(i=0; i<64; i++)
729 {
730 mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
731 mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
732 }
733
734 init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
735 if(s->intra_vlc_format)
736 init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
737
738 /* build unified dc encoding tables */
739 for(i=-255; i<256; i++)
740 {
741 int adiff, index;
742 int bits, code;
743 int diff=i;
744
745 adiff = FFABS(diff);
746 if(diff<0) diff--;
747 index = av_log2(2*adiff);
748
749 bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
750 code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
751 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
752
753 bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
754 code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
755 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
756 }
757
758 for(f_code=1; f_code<=MAX_FCODE; f_code++){
759 for(mv=-MAX_MV; mv<=MAX_MV; mv++){
760 int len;
761
762 if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
763 else{
764 int val, bit_size, range, code;
765
766 bit_size = f_code - 1;
767 range = 1 << bit_size;
768
769 val=mv;
770 if (val < 0)
771 val = -val;
772 val--;
773 code = (val >> bit_size) + 1;
774 if(code<17){
775 len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
776 }else{
777 len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
778 }
779 }
780
781 mv_penalty[f_code][mv+MAX_MV]= len;
782 }
783 }
784
785
786 for(f_code=MAX_FCODE; f_code>0; f_code--){
787 for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
788 fcode_tab[mv+MAX_MV]= f_code;
789 }
790 }
791 }
792 s->me.mv_penalty= mv_penalty;
793 s->fcode_tab= fcode_tab;
794 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
795 s->min_qcoeff=-255;
796 s->max_qcoeff= 255;
797 }else{
798 s->min_qcoeff=-2047;
799 s->max_qcoeff= 2047;
800 }
801 if (s->intra_vlc_format) {
802 s->intra_ac_vlc_length=
803 s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
804 } else {
805 s->intra_ac_vlc_length=
806 s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
807 }
808 s->inter_ac_vlc_length=
809 s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
810 }
811
812 static inline void encode_dc(MpegEncContext *s, int diff, int component)
813 {
814 if(((unsigned) (diff+255)) >= 511){
815 int index;
816
817 if(diff<0){
818 index= av_log2_16bit(-2*diff);
819 diff--;
820 }else{
821 index= av_log2_16bit(2*diff);
822 }
823 if (component == 0) {
824 put_bits(
825 &s->pb,
826 ff_mpeg12_vlc_dc_lum_bits[index] + index,
827 (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
828 }else{
829 put_bits(
830 &s->pb,
831 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
832 (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
833 }
834 }else{
835 if (component == 0) {
836 put_bits(
837 &s->pb,
838 mpeg1_lum_dc_uni[diff+255]&0xFF,
839 mpeg1_lum_dc_uni[diff+255]>>8);
840 } else {
841 put_bits(
842 &s->pb,
843 mpeg1_chr_dc_uni[diff+255]&0xFF,
844 mpeg1_chr_dc_uni[diff+255]>>8);
845 }
846 }
847 }
848
849 static void mpeg1_encode_block(MpegEncContext *s,
850 DCTELEM *block,
851 int n)
852 {
853 int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
854 int code, component;
855 const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
856
857 last_index = s->block_last_index[n];
858
859 /* DC coef */
860 if (s->mb_intra) {
861 component = (n <= 3 ? 0 : (n&1) + 1);
862 dc = block[0]; /* overflow is impossible */
863 diff = dc - s->last_dc[component];
864 encode_dc(s, diff, component);
865 s->last_dc[component] = dc;
866 i = 1;
867 if (s->intra_vlc_format)
868 table_vlc = ff_rl_mpeg2.table_vlc;
869 } else {
870 /* encode the first coefficient : needs to be done here because
871 it is handled slightly differently */
872 level = block[0];
873 if (abs(level) == 1) {
874 code = ((uint32_t)level >> 31); /* the sign bit */
875 put_bits(&s->pb, 2, code | 0x02);
876 i = 1;
877 } else {
878 i = 0;
879 last_non_zero = -1;
880 goto next_coef;
881 }
882 }
883
884 /* now quantify & encode AC coefs */
885 last_non_zero = i - 1;
886
887 for(;i<=last_index;i++) {
888 j = s->intra_scantable.permutated[i];
889 level = block[j];
890 next_coef:
891 #if 0
892 if (level != 0)
893 dprintf(s->avctx, "level[%d]=%d\n", i, level);
894 #endif
895 /* encode using VLC */
896 if (level != 0) {
897 run = i - last_non_zero - 1;
898
899 alevel= level;
900 MASK_ABS(sign, alevel)
901 sign&=1;
902
903 if (alevel <= mpeg1_max_level[0][run]){
904 code= mpeg1_index_run[0][run] + alevel - 1;
905 /* store the vlc & sign at once */
906 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
907 } else {
908 /* escape seems to be pretty rare <5% so I do not optimize it */
909 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
910 /* escape: only clip in this case */
911 put_bits(&s->pb, 6, run);
912 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
913 if (alevel < 128) {
914 put_sbits(&s->pb, 8, level);
915 } else {
916 if (level < 0) {
917 put_bits(&s->pb, 16, 0x8001 + level + 255);
918 } else {
919 put_sbits(&s->pb, 16, level);
920 }
921 }
922 }else{
923 put_sbits(&s->pb, 12, level);
924 }
925 }
926 last_non_zero = i;
927 }
928 }
929 /* end of block */
930 put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
931 }
932
933 AVCodec mpeg1video_encoder = {
934 "mpeg1video",
935 CODEC_TYPE_VIDEO,
936 CODEC_ID_MPEG1VIDEO,
937 sizeof(MpegEncContext),
938 encode_init,
939 MPV_encode_picture,
940 MPV_encode_end,
941 .supported_framerates= ff_frame_rate_tab+1,
942 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
943 .capabilities= CODEC_CAP_DELAY,
944 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
945 };
946
947 AVCodec mpeg2video_encoder = {
948 "mpeg2video",
949 CODEC_TYPE_VIDEO,
950 CODEC_ID_MPEG2VIDEO,
951 sizeof(MpegEncContext),
952 encode_init,
953 MPV_encode_picture,
954 MPV_encode_end,
955 .supported_framerates= ff_frame_rate_tab+1,
956 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_NONE},
957 .capabilities= CODEC_CAP_DELAY,
958 .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
959 };
ffmpeg Lagarith lossless decoder