3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of Libav.
8 * Libav 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.
13 * Libav 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.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 #include "mpegvideo.h"
33 #include "mpeg12data.h"
34 #include "bytestream.h"
36 #include "libavutil/log.h"
37 #include "libavutil/opt.h"
39 static const uint8_t inv_non_linear_qscale[13] = {
41 9,10,11,12,13,14,15,16,
44 static const uint8_t svcd_scan_offset_placeholder[14] = {
52 static void mpeg1_encode_block(MpegEncContext *s,
55 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code); // RAL: f_code parameter added
57 static uint8_t mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
58 static uint8_t fcode_tab[MAX_MV*2+1];
60 static uint8_t uni_mpeg1_ac_vlc_len [64*64*2];
61 static uint8_t uni_mpeg2_ac_vlc_len [64*64*2];
63 /* simple include everything table for dc, first byte is bits number next 3 are code*/
64 static uint32_t mpeg1_lum_dc_uni[512];
65 static uint32_t mpeg1_chr_dc_uni[512];
67 static uint8_t mpeg1_index_run[2][64];
68 static int8_t mpeg1_max_level[2][64];
70 static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
76 for(run=0; run<64; run++){
79 int alevel= FFABS(level);
80 int sign= (level>>31)&1;
82 if (alevel > rl->max_level[0][run])
85 code= rl->index_run[0][run] + alevel - 1;
87 if (code < 111 /* rl->n */) {
88 /* store the vlc & sign at once */
89 len= rl->table_vlc[code][1]+1;
90 bits= (rl->table_vlc[code][0]<<1) + sign;
92 len= rl->table_vlc[111/*rl->n*/][1]+6;
93 bits= rl->table_vlc[111/*rl->n*/][0]<<6;
103 bits|= 0x8001 + level + 255;
105 bits|= level & 0xffff;
110 uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
116 static int find_frame_rate_index(MpegEncContext *s){
118 int64_t dmin= INT64_MAX;
122 int64_t n0= 1001LL/ff_frame_rate_tab[i].den*ff_frame_rate_tab[i].num*s->avctx->time_base.num;
123 int64_t n1= 1001LL*s->avctx->time_base.den;
124 if(s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL && i>=9) break;
129 s->frame_rate_index= i;
138 static av_cold int encode_init(AVCodecContext *avctx)
140 MpegEncContext *s = avctx->priv_data;
142 if(MPV_encode_init(avctx) < 0)
145 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
146 if (avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE)
147 s->drop_frame_timecode = 1;
148 if (avctx->flags & CODEC_FLAG_SVCD_SCAN_OFFSET)
152 if(find_frame_rate_index(s) < 0){
153 if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
154 av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
157 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);
161 if(avctx->profile == FF_PROFILE_UNKNOWN){
162 if(avctx->level != FF_LEVEL_UNKNOWN){
163 av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
166 avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
169 if(avctx->level == FF_LEVEL_UNKNOWN){
170 if(avctx->profile == 0){ /* 4:2:2 */
171 if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
172 else avctx->level = 2; /* High */
174 if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
175 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
178 if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
179 else if(avctx->width <= 1440) avctx->level = 6; /* High 1440 */
180 else avctx->level = 4; /* High */
184 if (s->drop_frame_timecode && s->frame_rate_index != 4) {
185 av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
192 static void put_header(MpegEncContext *s, int header)
194 align_put_bits(&s->pb);
195 put_bits(&s->pb, 16, header>>16);
196 put_sbits(&s->pb, 16, header);
199 /* put sequence header if needed */
200 static void mpeg1_encode_sequence_header(MpegEncContext *s)
202 unsigned int vbv_buffer_size;
206 float best_aspect_error= 1E10;
207 float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
208 int constraint_parameter_flag;
210 if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
212 if (s->current_picture.f.key_frame) {
213 AVRational framerate= ff_frame_rate_tab[s->frame_rate_index];
215 /* mpeg1 header repeated every gop */
216 put_header(s, SEQ_START_CODE);
218 put_sbits(&s->pb, 12, s->width );
219 put_sbits(&s->pb, 12, s->height);
222 float error= aspect_ratio;
223 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
224 error-= 1.0/ff_mpeg1_aspect[i];
226 error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
230 if(error < best_aspect_error){
231 best_aspect_error= error;
232 s->aspect_ratio_info= i;
236 put_bits(&s->pb, 4, s->aspect_ratio_info);
237 put_bits(&s->pb, 4, s->frame_rate_index);
239 if(s->avctx->rc_max_rate){
240 v = (s->avctx->rc_max_rate + 399) / 400;
241 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
247 if(s->avctx->rc_buffer_size)
248 vbv_buffer_size = s->avctx->rc_buffer_size;
250 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
251 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
252 vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
254 put_sbits(&s->pb, 18, v);
255 put_bits(&s->pb, 1, 1); /* marker */
256 put_sbits(&s->pb, 10, vbv_buffer_size);
258 constraint_parameter_flag=
259 s->width <= 768 && s->height <= 576 &&
260 s->mb_width * s->mb_height <= 396 &&
261 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
262 framerate.num <= framerate.den*30 &&
263 s->avctx->me_range && s->avctx->me_range < 128 &&
264 vbv_buffer_size <= 20 &&
266 s->codec_id == CODEC_ID_MPEG1VIDEO;
268 put_bits(&s->pb, 1, constraint_parameter_flag);
270 ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
271 ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
273 if(s->codec_id == CODEC_ID_MPEG2VIDEO){
274 put_header(s, EXT_START_CODE);
275 put_bits(&s->pb, 4, 1); //seq ext
277 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
279 put_bits(&s->pb, 3, s->avctx->profile); //profile
280 put_bits(&s->pb, 4, s->avctx->level); //level
282 put_bits(&s->pb, 1, s->progressive_sequence);
283 put_bits(&s->pb, 2, s->chroma_format);
284 put_bits(&s->pb, 2, s->width >>12);
285 put_bits(&s->pb, 2, s->height>>12);
286 put_bits(&s->pb, 12, v>>18); //bitrate ext
287 put_bits(&s->pb, 1, 1); //marker
288 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
289 put_bits(&s->pb, 1, s->low_delay);
290 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
291 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
294 put_header(s, GOP_START_CODE);
295 put_bits(&s->pb, 1, s->drop_frame_timecode); /* drop frame flag */
296 /* time code : we must convert from the real frame rate to a
297 fake mpeg frame rate in case of low frame rate */
298 fps = (framerate.num + framerate.den/2)/ framerate.den;
299 time_code = s->current_picture_ptr->f.coded_picture_number + s->avctx->timecode_frame_start;
301 s->gop_picture_number = s->current_picture_ptr->f.coded_picture_number;
302 if (s->drop_frame_timecode) {
303 /* only works for NTSC 29.97 */
304 int d = time_code / 17982;
305 int m = time_code % 17982;
306 //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
307 time_code += 18 * d + 2 * ((m - 2) / 1798);
309 put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
310 put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
311 put_bits(&s->pb, 1, 1);
312 put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
313 put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
314 put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
315 put_bits(&s->pb, 1, 0); /* broken link */
319 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
321 put_bits(&s->pb, 11, 0x008);
324 put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
325 ff_mpeg12_mbAddrIncrTable[run][0]);
328 static av_always_inline void put_qscale(MpegEncContext *s)
331 assert(s->qscale>=1 && s->qscale <=12);
332 put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
334 put_bits(&s->pb, 5, s->qscale);
338 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
339 if (s->height > 2800) {
340 put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
341 put_bits(&s->pb, 3, s->mb_y >> 7); /* slice_vertical_position_extension */
343 put_header(s, SLICE_MIN_START_CODE + s->mb_y);
346 put_bits(&s->pb, 1, 0); /* slice extra information */
349 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
351 mpeg1_encode_sequence_header(s);
353 /* mpeg1 picture header */
354 put_header(s, PICTURE_START_CODE);
355 /* temporal reference */
357 // RAL: s->picture_number instead of s->fake_picture_number
358 put_bits(&s->pb, 10, (s->picture_number -
359 s->gop_picture_number) & 0x3ff);
360 put_bits(&s->pb, 3, s->pict_type);
362 s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
363 put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
365 // RAL: Forward f_code also needed for B frames
366 if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
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->f_code); /* forward_f_code */
371 put_bits(&s->pb, 3, 7); /* forward_f_code */
374 // RAL: Backward f_code necessary for B frames
375 if (s->pict_type == AV_PICTURE_TYPE_B) {
376 put_bits(&s->pb, 1, 0); /* half pel coordinates */
377 if(s->codec_id == CODEC_ID_MPEG1VIDEO)
378 put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
380 put_bits(&s->pb, 3, 7); /* backward_f_code */
383 put_bits(&s->pb, 1, 0); /* extra bit picture */
385 s->frame_pred_frame_dct = 1;
386 if(s->codec_id == CODEC_ID_MPEG2VIDEO){
387 put_header(s, EXT_START_CODE);
388 put_bits(&s->pb, 4, 8); //pic ext
389 if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
390 put_bits(&s->pb, 4, s->f_code);
391 put_bits(&s->pb, 4, s->f_code);
393 put_bits(&s->pb, 8, 255);
395 if (s->pict_type == AV_PICTURE_TYPE_B) {
396 put_bits(&s->pb, 4, s->b_code);
397 put_bits(&s->pb, 4, s->b_code);
399 put_bits(&s->pb, 8, 255);
401 put_bits(&s->pb, 2, s->intra_dc_precision);
403 assert(s->picture_structure == PICT_FRAME);
404 put_bits(&s->pb, 2, s->picture_structure);
405 if (s->progressive_sequence) {
406 put_bits(&s->pb, 1, 0); /* no repeat */
408 put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
410 /* XXX: optimize the generation of this flag with entropy
412 s->frame_pred_frame_dct = s->progressive_sequence;
414 put_bits(&s->pb, 1, s->frame_pred_frame_dct);
415 put_bits(&s->pb, 1, s->concealment_motion_vectors);
416 put_bits(&s->pb, 1, s->q_scale_type);
417 put_bits(&s->pb, 1, s->intra_vlc_format);
418 put_bits(&s->pb, 1, s->alternate_scan);
419 put_bits(&s->pb, 1, s->repeat_first_field);
420 s->progressive_frame = s->progressive_sequence;
421 put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
422 put_bits(&s->pb, 1, s->progressive_frame);
423 put_bits(&s->pb, 1, 0); //composite_display_flag
425 if (s->scan_offset) {
428 put_header(s, USER_START_CODE);
429 for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
430 put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
435 ff_mpeg1_encode_slice_header(s);
438 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
439 int has_mv, int field_motion)
441 put_bits(&s->pb, n, bits);
442 if (!s->frame_pred_frame_dct) {
444 put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
445 put_bits(&s->pb, 1, s->interlaced_dct);
449 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
450 DCTELEM block[6][64],
451 int motion_x, int motion_y,
455 const int mb_x = s->mb_x;
456 const int mb_y = s->mb_y;
457 const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
461 for(i=0;i<mb_block_count;i++) {
462 if (s->block_last_index[i] >= 0)
463 cbp |= 1 << (mb_block_count - 1 - i);
466 if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
467 (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
468 ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
469 (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) |
470 ((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))) {
472 s->qscale -= s->dquant;
476 if(s->pict_type == AV_PICTURE_TYPE_P){
477 s->last_mv[0][1][0]= s->last_mv[0][0][0]=
478 s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
482 assert(s->mb_skip_run == 0);
483 encode_mb_skip_run(s, s->mb_x);
485 encode_mb_skip_run(s, s->mb_skip_run);
488 if (s->pict_type == AV_PICTURE_TYPE_I) {
489 if(s->dquant && cbp){
490 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
493 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
494 s->qscale -= s->dquant;
496 s->misc_bits+= get_bits_diff(s);
498 } else if (s->mb_intra) {
499 if(s->dquant && cbp){
500 put_mb_modes(s, 6, 0x01, 0, 0);
503 put_mb_modes(s, 5, 0x03, 0, 0);
504 s->qscale -= s->dquant;
506 s->misc_bits+= get_bits_diff(s);
508 memset(s->last_mv, 0, sizeof(s->last_mv));
509 } else if (s->pict_type == AV_PICTURE_TYPE_P) {
510 if(s->mv_type == MV_TYPE_16X16){
512 if ((motion_x|motion_y) == 0) {
514 put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
517 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
519 s->misc_bits+= get_bits_diff(s);
522 put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
525 put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
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->mv_bits+= get_bits_diff(s);
533 put_bits(&s->pb, 3, 1); /* motion only */
534 if (!s->frame_pred_frame_dct)
535 put_bits(&s->pb, 2, 2); /* motion_type: frame */
536 s->misc_bits+= get_bits_diff(s);
537 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
538 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
539 s->qscale -= s->dquant;
540 s->mv_bits+= get_bits_diff(s);
542 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
543 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
545 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
549 put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
552 put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
555 put_bits(&s->pb, 3, 1); /* motion only */
556 put_bits(&s->pb, 2, 1); /* motion_type: field */
557 s->qscale -= s->dquant;
559 s->misc_bits+= get_bits_diff(s);
561 put_bits(&s->pb, 1, s->field_select[0][i]);
562 mpeg1_encode_motion(s, s->mv[0][i][0] - s->last_mv[0][i][0] , s->f_code);
563 mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
564 s->last_mv[0][i][0]= s->mv[0][i][0];
565 s->last_mv[0][i][1]= 2*s->mv[0][i][1];
567 s->mv_bits+= get_bits_diff(s);
570 if (s->chroma_y_shift) {
571 put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
573 put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
574 put_sbits(&s->pb, 2, cbp);
579 if(s->mv_type == MV_TYPE_16X16){
580 if (cbp){ // With coded bloc pattern
582 if(s->mv_dir == MV_DIR_FORWARD)
583 put_mb_modes(s, 6, 3, 1, 0);
585 put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
588 put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
590 }else{ // No coded bloc pattern
591 put_bits(&s->pb, 5-s->mv_dir, 2);
592 if (!s->frame_pred_frame_dct)
593 put_bits(&s->pb, 2, 2); /* motion_type: frame */
594 s->qscale -= s->dquant;
596 s->misc_bits += get_bits_diff(s);
597 if (s->mv_dir&MV_DIR_FORWARD){
598 mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
599 mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
600 s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
601 s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
604 if (s->mv_dir&MV_DIR_BACKWARD){
605 mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
606 mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
607 s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
608 s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
612 assert(s->mv_type == MV_TYPE_FIELD);
613 assert(!s->frame_pred_frame_dct);
614 if (cbp){ // With coded bloc pattern
616 if(s->mv_dir == MV_DIR_FORWARD)
617 put_mb_modes(s, 6, 3, 1, 1);
619 put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
622 put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
624 }else{ // No coded bloc pattern
625 put_bits(&s->pb, 5-s->mv_dir, 2);
626 put_bits(&s->pb, 2, 1); /* motion_type: field */
627 s->qscale -= s->dquant;
629 s->misc_bits += get_bits_diff(s);
630 if (s->mv_dir&MV_DIR_FORWARD){
632 put_bits(&s->pb, 1, s->field_select[0][i]);
633 mpeg1_encode_motion(s, s->mv[0][i][0] - s->last_mv[0][i][0] , s->f_code);
634 mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
635 s->last_mv[0][i][0]= s->mv[0][i][0];
636 s->last_mv[0][i][1]= 2*s->mv[0][i][1];
640 if (s->mv_dir&MV_DIR_BACKWARD){
642 put_bits(&s->pb, 1, s->field_select[1][i]);
643 mpeg1_encode_motion(s, s->mv[1][i][0] - s->last_mv[1][i][0] , s->b_code);
644 mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
645 s->last_mv[1][i][0]= s->mv[1][i][0];
646 s->last_mv[1][i][1]= 2*s->mv[1][i][1];
651 s->mv_bits += get_bits_diff(s);
653 if (s->chroma_y_shift) {
654 put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
656 put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
657 put_sbits(&s->pb, 2, cbp);
661 for(i=0;i<mb_block_count;i++) {
662 if (cbp & (1 << (mb_block_count - 1 - i))) {
663 mpeg1_encode_block(s, block[i], i);
668 s->i_tex_bits+= get_bits_diff(s);
670 s->p_tex_bits+= get_bits_diff(s);
674 void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
676 if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
677 else mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
680 // RAL: Parameter added: f_or_b_code
681 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
686 ff_mpeg12_mbMotionVectorTable[0][1],
687 ff_mpeg12_mbMotionVectorTable[0][0]);
689 int code, sign, bits;
690 int bit_size = f_or_b_code - 1;
691 int range = 1 << bit_size;
692 /* modulo encoding */
693 int l= INT_BIT - 5 - bit_size;
698 code = (val >> bit_size) + 1;
699 bits = val & (range - 1);
704 code = (val >> bit_size) + 1;
705 bits = val & (range - 1);
709 assert(code > 0 && code <= 16);
712 ff_mpeg12_mbMotionVectorTable[code][1],
713 ff_mpeg12_mbMotionVectorTable[code][0]);
715 put_bits(&s->pb, 1, sign);
717 put_bits(&s->pb, bit_size, bits);
722 void ff_mpeg1_encode_init(MpegEncContext *s)
726 ff_mpeg12_common_init(s);
734 init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
735 init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
739 mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
740 mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
743 init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
744 if(s->intra_vlc_format)
745 init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
747 /* build unified dc encoding tables */
748 for(i=-255; i<256; i++)
756 index = av_log2(2*adiff);
758 bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
759 code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
760 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
762 bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
763 code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
764 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
767 for(f_code=1; f_code<=MAX_FCODE; f_code++){
768 for(mv=-MAX_MV; mv<=MAX_MV; mv++){
771 if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
773 int val, bit_size, code;
775 bit_size = f_code - 1;
781 code = (val >> bit_size) + 1;
783 len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
785 len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
789 mv_penalty[f_code][mv+MAX_MV]= len;
794 for(f_code=MAX_FCODE; f_code>0; f_code--){
795 for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
796 fcode_tab[mv+MAX_MV]= f_code;
800 s->me.mv_penalty= mv_penalty;
801 s->fcode_tab= fcode_tab;
802 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
809 if (s->intra_vlc_format) {
810 s->intra_ac_vlc_length=
811 s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
813 s->intra_ac_vlc_length=
814 s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
816 s->inter_ac_vlc_length=
817 s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
820 static inline void encode_dc(MpegEncContext *s, int diff, int component)
822 if(((unsigned) (diff+255)) >= 511){
826 index= av_log2_16bit(-2*diff);
829 index= av_log2_16bit(2*diff);
831 if (component == 0) {
834 ff_mpeg12_vlc_dc_lum_bits[index] + index,
835 (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
839 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
840 (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
843 if (component == 0) {
846 mpeg1_lum_dc_uni[diff+255]&0xFF,
847 mpeg1_lum_dc_uni[diff+255]>>8);
851 mpeg1_chr_dc_uni[diff+255]&0xFF,
852 mpeg1_chr_dc_uni[diff+255]>>8);
857 static void mpeg1_encode_block(MpegEncContext *s,
861 int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
863 const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
865 last_index = s->block_last_index[n];
869 component = (n <= 3 ? 0 : (n&1) + 1);
870 dc = block[0]; /* overflow is impossible */
871 diff = dc - s->last_dc[component];
872 encode_dc(s, diff, component);
873 s->last_dc[component] = dc;
875 if (s->intra_vlc_format)
876 table_vlc = ff_rl_mpeg2.table_vlc;
878 /* encode the first coefficient : needs to be done here because
879 it is handled slightly differently */
881 if (abs(level) == 1) {
882 code = ((uint32_t)level >> 31); /* the sign bit */
883 put_bits(&s->pb, 2, code | 0x02);
892 /* now quantify & encode AC coefs */
893 last_non_zero = i - 1;
895 for(;i<=last_index;i++) {
896 j = s->intra_scantable.permutated[i];
899 /* encode using VLC */
901 run = i - last_non_zero - 1;
904 MASK_ABS(sign, alevel)
907 if (alevel <= mpeg1_max_level[0][run]){
908 code= mpeg1_index_run[0][run] + alevel - 1;
909 /* store the vlc & sign at once */
910 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
912 /* escape seems to be pretty rare <5% so I do not optimize it */
913 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
914 /* escape: only clip in this case */
915 put_bits(&s->pb, 6, run);
916 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
918 put_sbits(&s->pb, 8, level);
921 put_bits(&s->pb, 16, 0x8001 + level + 255);
923 put_sbits(&s->pb, 16, level);
927 put_sbits(&s->pb, 12, level);
934 put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
937 #define OFFSET(x) offsetof(MpegEncContext, x)
938 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
940 { "intra_vlc", "Use MPEG-2 intra VLC table.", OFFSET(intra_vlc_format), FF_OPT_TYPE_INT, { 0 }, 0, 1, VE },\
941 { "drop_frame_timecode", "Timecode is in drop frame format.", OFFSET(drop_frame_timecode), FF_OPT_TYPE_INT, { 0 }, 0, 1, VE}, \
942 { "scan_offset", "Reserve space for SVCD scan offset user data.", OFFSET(scan_offset), FF_OPT_TYPE_INT, { 0 }, 0, 1, VE },
944 static const AVOption mpeg1_options[] = {
949 static const AVOption mpeg2_options[] = {
951 { "non_linear_quant", "Use nonlinear quantizer.", OFFSET(q_scale_type), FF_OPT_TYPE_INT, { 0 }, 0, 1, VE },
952 { "alternate_scan", "Enable alternate scantable.", OFFSET(alternate_scan), FF_OPT_TYPE_INT, { 0 }, 0, 1, VE },
956 #define mpeg12_class(x)\
957 static const AVClass mpeg## x ##_class = {\
958 .class_name = "mpeg" #x "video encoder",\
959 .item_name = av_default_item_name,\
960 .option = mpeg## x ##_options,\
961 .version = LIBAVUTIL_VERSION_INT,\
967 AVCodec ff_mpeg1video_encoder = {
968 .name = "mpeg1video",
969 .type = AVMEDIA_TYPE_VIDEO,
970 .id = CODEC_ID_MPEG1VIDEO,
971 .priv_data_size = sizeof(MpegEncContext),
973 .encode = MPV_encode_picture,
974 .close = MPV_encode_end,
975 .supported_framerates= ff_frame_rate_tab+1,
976 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
977 .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
978 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
979 .priv_class = &mpeg1_class,
982 AVCodec ff_mpeg2video_encoder = {
983 .name = "mpeg2video",
984 .type = AVMEDIA_TYPE_VIDEO,
985 .id = CODEC_ID_MPEG2VIDEO,
986 .priv_data_size = sizeof(MpegEncContext),
988 .encode = MPV_encode_picture,
989 .close = MPV_encode_end,
990 .supported_framerates= ff_frame_rate_tab+1,
991 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_NONE},
992 .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
993 .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
994 .priv_class = &mpeg2_class,