3 * Copyright (c) 2001 Fabrice Bellard.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 #include "mpegvideo.h"
30 //#define PRINT_FRAME_TIME
31 #ifdef PRINT_FRAME_TIME
32 static inline long long rdtsc()
35 asm volatile( "rdtsc\n\t"
38 // printf("%d\n", int(l/1000));
43 int ff_h263_decode_init(AVCodecContext *avctx)
45 MpegEncContext *s = avctx->priv_data;
48 s->out_format = FMT_H263;
50 s->width = avctx->width;
51 s->height = avctx->height;
52 s->workaround_bugs= avctx->workaround_bugs;
56 s->progressive_sequence=1;
57 s->decode_mb= ff_h263_decode_mb;
59 avctx->pix_fmt= PIX_FMT_YUV420P;
61 /* select sub codec */
62 switch(avctx->codec->id) {
67 s->time_increment_bits = 4; /* default value for broken headers */
69 s->low_delay = 0; //default, might be overriden in the vol header during header parsing
71 case CODEC_ID_MSMPEG4V1:
76 case CODEC_ID_MSMPEG4V2:
81 case CODEC_ID_MSMPEG4V3:
102 s->codec_id= avctx->codec->id;
104 /* for h263, we allocate the images after having read the header */
105 if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
106 if (MPV_common_init(s) < 0)
110 ff_msmpeg4_decode_init(s);
112 h263_decode_init_vlc(s);
117 int ff_h263_decode_end(AVCodecContext *avctx)
119 MpegEncContext *s = avctx->priv_data;
126 * retunrs the number of bytes consumed for building the current frame
128 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
129 int pos= (get_bits_count(&s->gb)+7)>>3;
132 //we would have to scan through the whole buf to handle the weird reordering ...
134 }else if(s->flags&CODEC_FLAG_TRUNCATED){
135 pos -= s->parse_context.last_index;
136 if(pos<0) pos=0; // padding is not really read so this might be -1
139 if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
140 if(pos+10>buf_size) pos=buf_size; // oops ;)
146 static int decode_slice(MpegEncContext *s){
147 const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
148 s->last_resync_gb= s->gb;
149 s->first_slice_line= 1;
151 s->resync_mb_x= s->mb_x;
152 s->resync_mb_y= s->mb_y;
154 s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
155 s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
157 if(s->partitioned_frame){
158 const int qscale= s->qscale;
160 if(s->codec_id==CODEC_ID_MPEG4){
161 if(ff_mpeg4_decode_partitions(s) < 0)
165 /* restore variables which where modified */
166 s->first_slice_line=1;
167 s->mb_x= s->resync_mb_x;
168 s->mb_y= s->resync_mb_y;
170 s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
171 s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
174 for(; s->mb_y < s->mb_height; s->mb_y++) {
175 /* per-row end of slice checks */
176 if(s->msmpeg4_version){
177 if(s->resync_mb_y + s->slice_height == s->mb_y){
178 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
184 if(s->msmpeg4_version==1){
190 ff_init_block_index(s);
191 for(; s->mb_x < s->mb_width; s->mb_x++) {
194 ff_update_block_index(s);
196 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
197 s->first_slice_line=0;
201 s->dsp.clear_blocks(s->block[0]);
203 s->mv_dir = MV_DIR_FORWARD;
204 s->mv_type = MV_TYPE_16X16;
206 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
207 ret= s->decode_mb(s, s->block);
209 MPV_decode_mb(s, s->block);
212 const int xy= s->mb_x + s->mb_y*s->mb_stride;
214 //printf("%d %d %d %06X\n", s->mb_x, s->mb_y, s->gb.size*8 - get_bits_count(&s->gb), show_bits(&s->gb, 24));
215 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
217 s->padding_bug_score--;
219 if(++s->mb_x >= s->mb_width){
221 ff_draw_horiz_band(s, s->mb_y*16, 16);
225 }else if(ret==SLICE_NOEND){
226 fprintf(stderr,"Slice mismatch at MB: %d\n", xy);
227 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
230 fprintf(stderr,"Error at MB: %d\n", xy);
231 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_ERROR|DC_ERROR|MV_ERROR)&part_mask);
237 ff_draw_horiz_band(s, s->mb_y*16, 16);
242 assert(s->mb_x==0 && s->mb_y==s->mb_height);
244 /* try to detect the padding bug */
245 if( s->codec_id==CODEC_ID_MPEG4
246 && (s->workaround_bugs&FF_BUG_AUTODETECT)
247 && s->gb.size_in_bits - get_bits_count(&s->gb) >=0
248 && s->gb.size_in_bits - get_bits_count(&s->gb) < 48
249 // && !s->resync_marker
250 && !s->data_partitioning){
252 const int bits_count= get_bits_count(&s->gb);
253 const int bits_left = s->gb.size_in_bits - bits_count;
256 s->padding_bug_score+=16;
257 }else if(bits_left>8){
258 s->padding_bug_score++;
259 } else if(bits_left != 1){
260 int v= show_bits(&s->gb, 8);
261 v|= 0x7F >> (7-(bits_count&7));
264 s->padding_bug_score--;
266 s->padding_bug_score++;
270 // handle formats which dont have unique end markers
271 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
272 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
275 /* no markers in M$ crap */
276 if(s->msmpeg4_version && s->pict_type==I_TYPE)
279 /* buggy padding but the frame should still end approximately at the bitstream end */
280 if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
282 else if((s->workaround_bugs&FF_BUG_NO_PADDING))
283 max_extra+= 256*256*256*64;
286 fprintf(stderr, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
289 fprintf(stderr, "overreading %d bits\n", -left);
291 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
296 fprintf(stderr, "slice end not reached but screenspace end (%d left %06X)\n",
297 s->gb.size_in_bits - get_bits_count(&s->gb),
298 show_bits(&s->gb, 24));
300 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
306 * finds the end of the current frame in the bitstream.
307 * @return the position of the first byte of the next frame, or -1
309 static int mpeg4_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
310 ParseContext *pc= &s->parse_context;
314 vop_found= pc->frame_start_found;
319 for(i=0; i<buf_size; i++){
320 state= (state<<8) | buf[i];
330 for(; i<buf_size; i++){
331 state= (state<<8) | buf[i];
332 if((state&0xFFFFFF00) == 0x100){
333 pc->frame_start_found=0;
339 pc->frame_start_found= vop_found;
341 return END_NOT_FOUND;
344 static int h263_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
345 ParseContext *pc= &s->parse_context;
349 vop_found= pc->frame_start_found;
354 for(i=0; i<buf_size; i++){
355 state= (state<<8) | buf[i];
356 if(state>>(32-22) == 0x20){
365 for(; i<buf_size; i++){
366 state= (state<<8) | buf[i];
367 if(state>>(32-22) == 0x20){
368 pc->frame_start_found=0;
374 pc->frame_start_found= vop_found;
377 return END_NOT_FOUND;
380 int ff_h263_decode_frame(AVCodecContext *avctx,
381 void *data, int *data_size,
382 uint8_t *buf, int buf_size)
384 MpegEncContext *s = avctx->priv_data;
386 AVFrame *pict = data;
389 #ifdef PRINT_FRAME_TIME
390 uint64_t time= rdtsc();
393 printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
394 printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
396 s->flags= avctx->flags;
400 /* no supplementary picture */
405 if(s->flags&CODEC_FLAG_TRUNCATED){
408 if(s->codec_id==CODEC_ID_MPEG4){
409 next= mpeg4_find_frame_end(s, buf, buf_size);
410 }else if(s->codec_id==CODEC_ID_H263){
411 next= h263_find_frame_end(s, buf, buf_size);
413 fprintf(stderr, "this codec doesnt support truncated bitstreams\n");
417 if( ff_combine_frame(s, next, &buf, &buf_size) < 0 )
423 if(s->bitstream_buffer_size && buf_size<20){ //divx 5.01+ frame reorder
424 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
426 init_get_bits(&s->gb, buf, buf_size*8);
427 s->bitstream_buffer_size=0;
429 if (!s->context_initialized) {
430 if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
435 if (s->msmpeg4_version==5) {
436 ret= ff_wmv2_decode_picture_header(s);
437 } else if (s->msmpeg4_version) {
438 ret = msmpeg4_decode_picture_header(s);
439 } else if (s->h263_pred) {
440 if(s->avctx->extradata_size && s->picture_number==0){
443 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
444 ret = ff_mpeg4_decode_picture_header(s, &gb);
446 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
448 if(s->flags& CODEC_FLAG_LOW_DELAY)
450 } else if (s->h263_intel) {
451 ret = intel_h263_decode_picture_header(s);
453 ret = h263_decode_picture_header(s);
455 avctx->has_b_frames= !s->low_delay;
457 if(s->workaround_bugs&FF_BUG_AUTODETECT){
458 if(s->padding_bug_score > -2 && !s->data_partitioning && !s->resync_marker)
459 s->workaround_bugs |= FF_BUG_NO_PADDING;
461 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
463 if(s->avctx->codec_tag == ff_get_fourcc("XVIX"))
464 s->workaround_bugs|= FF_BUG_XVID_ILACE;
466 if(s->avctx->codec_tag == ff_get_fourcc("MP4S"))
467 s->workaround_bugs|= FF_BUG_AC_VLC;
469 if(s->avctx->codec_tag == ff_get_fourcc("M4S2"))
470 s->workaround_bugs|= FF_BUG_AC_VLC;
472 if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
473 s->workaround_bugs|= FF_BUG_UMP4;
474 s->workaround_bugs|= FF_BUG_AC_VLC;
478 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
481 if(s->divx_version>502){
482 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
485 if(s->avctx->codec_tag == ff_get_fourcc("XVID") && s->xvid_build==0)
486 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
488 if(s->avctx->codec_tag == ff_get_fourcc("XVID") && s->xvid_build==0)
489 s->padding_bug_score= 256*256*256*64;
491 if(s->xvid_build && s->xvid_build<=3)
492 s->padding_bug_score= 256*256*256*64;
494 if(s->xvid_build && s->xvid_build<=1)
495 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
497 #define SET_QPEL_FUNC(postfix1, postfix2) \
498 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
499 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
500 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
502 if(s->lavc_build && s->lavc_build<4653)
503 s->workaround_bugs|= FF_BUG_STD_QPEL;
505 if(s->lavc_build && s->lavc_build<4655)
506 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
509 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
510 //printf("padding_bug_score: %d\n", s->padding_bug_score);
511 if(s->divx_version==501 && s->divx_build==20020416)
512 s->padding_bug_score= 256*256*256*64;
514 if(s->divx_version>=500){
515 s->workaround_bugs|= FF_BUG_EDGE;
519 if(s->divx_version==500)
520 s->padding_bug_score= 256*256*256*64;
522 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
523 * lets hope this at least works
525 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
526 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
527 s->workaround_bugs|= FF_BUG_NO_PADDING;
529 if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
530 s->workaround_bugs|= FF_BUG_NO_PADDING;
534 if(s->workaround_bugs& FF_BUG_STD_QPEL){
535 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
536 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
537 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
538 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
539 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
540 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
542 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
543 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
544 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
545 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
546 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
547 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
550 #if 0 // dump bits per frame / qp / complexity
553 if(!f) f=fopen("rate_qp_cplx.txt", "w");
554 fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
558 /* After H263 & mpeg4 header decode we have the height, width,*/
559 /* and other parameters. So then we could init the picture */
560 /* FIXME: By the way H263 decoder is evolving it should have */
561 /* an H263EncContext */
562 if(s->aspected_height)
563 new_aspect= s->aspected_width*s->width / (float)(s->height*s->aspected_height);
567 if ( s->width != avctx->width || s->height != avctx->height
568 || ABS(new_aspect - avctx->aspect_ratio) > 0.001) {
569 /* H.263 could change picture size any time */
572 if (!s->context_initialized) {
573 avctx->width = s->width;
574 avctx->height = s->height;
575 avctx->aspect_ratio= new_aspect;
580 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
581 s->gob_index = ff_h263_get_gob_height(s);
583 if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
584 /* skip if the header was thrashed */
586 fprintf(stderr, "header damaged\n");
591 s->current_picture.pict_type= s->pict_type;
592 s->current_picture.key_frame= s->pict_type == I_TYPE;
594 /* skip b frames if we dont have reference frames */
595 if(s->last_picture_ptr==NULL && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
596 /* skip b frames if we are in a hurry */
597 if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
598 /* skip everything if we are in a hurry>=5 */
599 if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
601 if(s->next_p_frame_damaged){
602 if(s->pict_type==B_TYPE)
603 return get_consumed_bytes(s, buf_size);
605 s->next_p_frame_damaged=0;
608 if(MPV_frame_start(s, avctx) < 0)
612 printf("qscale=%d\n", s->qscale);
615 ff_er_frame_start(s);
617 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
618 //which isnt available before MPV_frame_start()
619 if (s->msmpeg4_version==5){
620 if(ff_wmv2_decode_secondary_picture_header(s) < 0)
624 /* decode each macroblock */
629 while(s->mb_y<s->mb_height){
630 if(s->msmpeg4_version){
631 if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
634 if(ff_h263_resync(s)<0)
638 if(s->msmpeg4_version<4 && s->h263_pred)
639 ff_mpeg4_clean_buffers(s);
644 if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
645 if(msmpeg4_decode_ext_header(s, buf_size) < 0){
646 s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
649 /* divx 5.01+ bistream reorder stuff */
650 if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
651 int current_pos= get_bits_count(&s->gb)>>3;
653 if( buf_size - current_pos > 5
654 && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
656 int startcode_found=0;
657 for(i=current_pos; i<buf_size-3; i++){
658 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
664 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
665 s->bitstream_buffer_size= buf_size - current_pos;
674 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
675 assert(s->current_picture.pict_type == s->pict_type);
676 if(s->pict_type==B_TYPE || s->low_delay){
677 *pict= *(AVFrame*)&s->current_picture;
678 ff_print_debug_info(s, s->current_picture_ptr);
680 *pict= *(AVFrame*)&s->last_picture;
681 ff_print_debug_info(s, s->last_picture_ptr);
684 /* Return the Picture timestamp as the frame number */
685 /* we substract 1 because it is added on utils.c */
686 avctx->frame_number = s->picture_number - 1;
688 /* dont output the last pic after seeking */
689 if(s->last_picture_ptr || s->low_delay)
690 *data_size = sizeof(AVFrame);
691 #ifdef PRINT_FRAME_TIME
692 printf("%Ld\n", rdtsc()-time);
695 return get_consumed_bytes(s, buf_size);
698 static const AVOption mpeg4_decoptions[] =
700 AVOPTION_SUB(avoptions_workaround_bug),
704 AVCodec mpeg4_decoder = {
708 sizeof(MpegEncContext),
712 ff_h263_decode_frame,
713 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
714 .options = mpeg4_decoptions,
717 AVCodec h263_decoder = {
721 sizeof(MpegEncContext),
725 ff_h263_decode_frame,
726 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
729 AVCodec msmpeg4v1_decoder = {
733 sizeof(MpegEncContext),
737 ff_h263_decode_frame,
738 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
742 AVCodec msmpeg4v2_decoder = {
746 sizeof(MpegEncContext),
750 ff_h263_decode_frame,
751 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
755 AVCodec msmpeg4v3_decoder = {
759 sizeof(MpegEncContext),
763 ff_h263_decode_frame,
764 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
765 .options = mpeg4_decoptions,
768 AVCodec wmv1_decoder = {
772 sizeof(MpegEncContext),
776 ff_h263_decode_frame,
777 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
781 AVCodec h263i_decoder = {
785 sizeof(MpegEncContext),
789 ff_h263_decode_frame,
790 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,