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
21 #include "mpegvideo.h"
24 #define PRINT_QP(a, b) {}
26 #define PRINT_QP(a, b) printf(a, b)
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 static int 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;
60 /* select sub codec */
61 switch(avctx->codec->id) {
66 s->time_increment_bits = 4; /* default value for broken headers */
68 s->low_delay = 0; //default, might be overriden in the vol header during header parsing
70 case CODEC_ID_MSMPEG4V1:
75 case CODEC_ID_MSMPEG4V2:
80 case CODEC_ID_MSMPEG4V3:
101 s->codec_id= avctx->codec->id;
103 /* for h263, we allocate the images after having read the header */
104 if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
105 if (MPV_common_init(s) < 0)
109 ff_msmpeg4_decode_init(s);
111 h263_decode_init_vlc(s);
116 static int h263_decode_end(AVCodecContext *avctx)
118 MpegEncContext *s = avctx->priv_data;
125 * retunrs the number of bytes consumed for building the current frame
127 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
128 int pos= (get_bits_count(&s->gb)+7)>>3;
130 if(s->divx_version>=500){
131 //we would have to scan through the whole buf to handle the weird reordering ...
133 }else if(s->flags&CODEC_FLAG_TRUNCATED){
134 pos -= s->parse_context.last_index;
135 if(pos<0) pos=0; // padding is not really read so this might be -1
138 if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
139 if(pos+10>buf_size) pos=buf_size; // oops ;)
145 static int decode_slice(MpegEncContext *s){
146 s->last_resync_gb= s->gb;
147 s->first_slice_line= 1;
149 s->resync_mb_x= s->mb_x;
150 s->resync_mb_y= s->mb_y;
152 s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
153 s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
155 if(s->partitioned_frame){
156 const int qscale= s->qscale;
158 if(s->codec_id==CODEC_ID_MPEG4){
159 if(ff_mpeg4_decode_partitions(s) < 0)
163 /* restore variables which where modified */
164 s->first_slice_line=1;
165 s->mb_x= s->resync_mb_x;
166 s->mb_y= s->resync_mb_y;
168 s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
169 s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
172 for(; s->mb_y < s->mb_height; s->mb_y++) {
173 /* per-row end of slice checks */
174 if(s->msmpeg4_version){
175 if(s->resync_mb_y + s->slice_height == s->mb_y){
176 const int xy= s->mb_x + s->mb_y*s->mb_width;
177 s->error_status_table[xy-1]|= AC_END|DC_END|MV_END;
182 if(s->msmpeg4_version==1){
188 ff_init_block_index(s);
189 for(; s->mb_x < s->mb_width; s->mb_x++) {
192 ff_update_block_index(s);
194 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
195 s->first_slice_line=0;
199 s->dsp.clear_blocks(s->block[0]);
201 s->mv_dir = MV_DIR_FORWARD;
202 s->mv_type = MV_TYPE_16X16;
204 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
205 ret= s->decode_mb(s, s->block);
207 PRINT_QP("%2d", s->qscale);
208 MPV_decode_mb(s, s->block);
211 const int xy= s->mb_x + s->mb_y*s->mb_width;
213 //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));
214 s->error_status_table[xy]|= AC_END;
215 if(!s->partitioned_frame)
216 s->error_status_table[xy]|= MV_END|DC_END;
218 s->padding_bug_score--;
220 if(++s->mb_x >= s->mb_width){
222 ff_draw_horiz_band(s);
226 }else if(ret==SLICE_NOEND){
227 fprintf(stderr,"Slice mismatch at MB: %d\n", xy);
230 fprintf(stderr,"Error at MB: %d\n", xy);
231 s->error_status_table[xy]|= AC_ERROR;
232 if(!s->partitioned_frame)
233 s->error_status_table[xy]|= DC_ERROR|MV_ERROR;
239 ff_draw_horiz_band(s);
241 PRINT_QP("%s", "\n");
246 assert(s->mb_x==0 && s->mb_y==s->mb_height);
248 /* try to detect the padding bug */
249 if( s->codec_id==CODEC_ID_MPEG4
250 && (s->workaround_bugs&FF_BUG_AUTODETECT)
251 && s->gb.size*8 - get_bits_count(&s->gb) >=0
252 && s->gb.size*8 - get_bits_count(&s->gb) < 48
254 && !s->data_partitioning){
256 const int bits_count= get_bits_count(&s->gb);
257 const int bits_left = s->gb.size*8 - bits_count;
259 if(bits_left==0 || bits_left>8){
260 s->padding_bug_score++;
261 } else if(bits_left != 1){
262 int v= show_bits(&s->gb, 8);
263 v|= 0x7F >> (7-(bits_count&7));
266 s->padding_bug_score--;
268 s->padding_bug_score++;
271 if(s->padding_bug_score > -2)
272 s->workaround_bugs |= FF_BUG_NO_PADDING;
274 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
277 // handle formats which dont have unique end markers
278 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
279 int left= s->gb.size*8 - get_bits_count(&s->gb);
282 /* no markers in M$ crap */
283 if(s->msmpeg4_version && s->pict_type==I_TYPE)
286 /* buggy padding but the frame should still end approximately at the bitstream end */
287 if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
289 else if((s->workaround_bugs&FF_BUG_NO_PADDING))
290 max_extra+= 256*256*256*64;
293 fprintf(stderr, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
296 fprintf(stderr, "overreading %d bits\n", -left);
298 s->error_status_table[s->mb_num-1]|= AC_END|MV_END|DC_END;
303 fprintf(stderr, "slice end not reached but screenspace end (%d left %06X)\n",
304 s->gb.size*8 - get_bits_count(&s->gb),
305 show_bits(&s->gb, 24));
310 * finds the end of the current frame in the bitstream.
311 * @return the position of the first byte of the next frame, or -1
313 static int mpeg4_find_frame_end(MpegEncContext *s, UINT8 *buf, int buf_size){
314 ParseContext *pc= &s->parse_context;
318 vop_found= pc->frame_start_found;
323 for(i=0; i<buf_size; i++){
324 state= (state<<8) | buf[i];
333 for(; i<buf_size; i++){
334 state= (state<<8) | buf[i];
335 if((state&0xFFFFFF00) == 0x100){
336 pc->frame_start_found=0;
341 pc->frame_start_found= vop_found;
346 static int h263_decode_frame(AVCodecContext *avctx,
347 void *data, int *data_size,
348 UINT8 *buf, int buf_size)
350 MpegEncContext *s = avctx->priv_data;
352 AVFrame *pict = data;
355 #ifdef PRINT_FRAME_TIME
356 uint64_t time= rdtsc();
359 printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
360 printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
362 s->flags= avctx->flags;
366 /* no supplementary picture */
371 if(s->flags&CODEC_FLAG_TRUNCATED){
373 ParseContext *pc= &s->parse_context;
375 pc->last_index= pc->index;
377 if(s->codec_id==CODEC_ID_MPEG4){
378 next= mpeg4_find_frame_end(s, buf, buf_size);
380 fprintf(stderr, "this codec doesnt support truncated bitstreams\n");
384 if(buf_size + FF_INPUT_BUFFER_PADDING_SIZE + pc->index > pc->buffer_size){
385 pc->buffer_size= buf_size + pc->index + 10*1024;
386 pc->buffer= realloc(pc->buffer, pc->buffer_size);
389 memcpy(&pc->buffer[pc->index], buf, buf_size);
390 pc->index += buf_size;
395 if(next + FF_INPUT_BUFFER_PADDING_SIZE + pc->index > pc->buffer_size){
396 pc->buffer_size= next + pc->index + 10*1024;
397 pc->buffer= realloc(pc->buffer, pc->buffer_size);
400 memcpy(&pc->buffer[pc->index], buf, next + FF_INPUT_BUFFER_PADDING_SIZE );
403 buf_size= pc->last_index + next;
409 if(s->bitstream_buffer_size && buf_size<20){ //divx 5.01+ frame reorder
410 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size);
412 init_get_bits(&s->gb, buf, buf_size);
413 s->bitstream_buffer_size=0;
415 if (!s->context_initialized) {
416 if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
421 if (s->h263_msmpeg4) {
422 ret = msmpeg4_decode_picture_header(s);
423 } else if (s->h263_pred) {
424 if(s->avctx->extradata_size && s->picture_number==0){
427 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size);
428 ret = ff_mpeg4_decode_picture_header(s, &gb);
430 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
432 if(s->flags& CODEC_FLAG_LOW_DELAY)
434 } else if (s->h263_intel) {
435 ret = intel_h263_decode_picture_header(s);
437 ret = h263_decode_picture_header(s);
439 avctx->has_b_frames= !s->low_delay;
441 if(s->workaround_bugs&FF_BUG_AUTODETECT){
442 if(s->avctx->fourcc == ff_get_fourcc("XVIX"))
443 s->workaround_bugs|= FF_BUG_XVID_ILACE;
445 if(s->avctx->fourcc == ff_get_fourcc("MP4S"))
446 s->workaround_bugs|= FF_BUG_AC_VLC;
448 if(s->avctx->fourcc == ff_get_fourcc("M4S2"))
449 s->workaround_bugs|= FF_BUG_AC_VLC;
451 if(s->avctx->fourcc == ff_get_fourcc("UMP4")){
452 s->workaround_bugs|= FF_BUG_UMP4;
453 s->workaround_bugs|= FF_BUG_AC_VLC;
457 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
460 if(s->avctx->fourcc == ff_get_fourcc("XVID") && s->xvid_build==0)
461 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
463 if(s->avctx->fourcc == ff_get_fourcc("XVID") && s->xvid_build==0)
464 s->padding_bug_score= 256*256*256*64;
466 if(s->xvid_build && s->xvid_build<=1)
467 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
469 //printf("padding_bug_score: %d\n", s->padding_bug_score);
471 if(s->divx_version==500)
472 s->workaround_bugs|= FF_BUG_NO_PADDING;
474 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
475 * lets hope this at least works
477 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
478 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
479 s->workaround_bugs|= FF_BUG_NO_PADDING;
481 if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
482 s->workaround_bugs|= FF_BUG_NO_PADDING;
487 #if 0 // dump bits per frame / qp / complexity
490 if(!f) f=fopen("rate_qp_cplx.txt", "w");
491 fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
495 /* After H263 & mpeg4 header decode we have the height, width,*/
496 /* and other parameters. So then we could init the picture */
497 /* FIXME: By the way H263 decoder is evolving it should have */
498 /* an H263EncContext */
499 if(s->aspected_height)
500 new_aspect= s->aspected_width*s->width / (float)(s->height*s->aspected_height);
504 if ( s->width != avctx->width || s->height != avctx->height
505 || ABS(new_aspect - avctx->aspect_ratio) > 0.001) {
506 /* H.263 could change picture size any time */
508 s->context_initialized=0;
510 if (!s->context_initialized) {
511 avctx->width = s->width;
512 avctx->height = s->height;
513 avctx->aspect_ratio= new_aspect;
518 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
519 s->gob_index = ff_h263_get_gob_height(s);
521 if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
522 /* skip if the header was thrashed */
524 fprintf(stderr, "header damaged\n");
529 s->current_picture.pict_type= s->pict_type;
530 s->current_picture.key_frame= s->pict_type == I_TYPE;
532 /* skip b frames if we dont have reference frames */
533 if(s->last_picture.data[0]==NULL && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
534 /* skip b frames if we are in a hurry */
535 if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
536 /* skip everything if we are in a hurry>=5 */
537 if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
539 if(s->next_p_frame_damaged){
540 if(s->pict_type==B_TYPE)
541 return get_consumed_bytes(s, buf_size);
543 s->next_p_frame_damaged=0;
546 if(MPV_frame_start(s, avctx) < 0)
550 printf("qscale=%d\n", s->qscale);
553 if(s->error_resilience)
554 memset(s->error_status_table, MV_ERROR|AC_ERROR|DC_ERROR|VP_START|AC_END|DC_END|MV_END, s->mb_num*sizeof(UINT8));
556 /* decode each macroblock */
560 s->block_wrap[3]= s->mb_width*2 + 2;
562 s->block_wrap[5]= s->mb_width + 2;
567 s->error_status_table[0]|= VP_START;
568 while(s->mb_y<s->mb_height && s->gb.size*8 - get_bits_count(&s->gb)>16){
569 if(s->msmpeg4_version){
570 if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0)
573 if(ff_h263_resync(s)<0)
577 if(s->msmpeg4_version!=4 && s->h263_pred)
578 ff_mpeg4_clean_buffers(s);
582 s->error_status_table[s->resync_mb_x + s->resync_mb_y*s->mb_width]|= VP_START;
585 if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
586 if(msmpeg4_decode_ext_header(s, buf_size) < 0){
587 s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
590 /* divx 5.01+ bistream reorder stuff */
591 if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_version>=500){
592 int current_pos= get_bits_count(&s->gb)>>3;
594 if( buf_size - current_pos > 5
595 && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
597 int startcode_found=0;
598 for(i=current_pos; i<buf_size-3; i++){
599 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
605 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
606 s->bitstream_buffer_size= buf_size - current_pos;
611 if(s->error_resilience){
612 int error=0, num_end_markers=0;
613 for(i=0; i<s->mb_num; i++){
614 int status= s->error_status_table[i];
616 if(i%s->mb_width == 0) printf("\n");
617 printf("%2X ", status);
619 if(status==0) continue;
621 if(status&(DC_ERROR|AC_ERROR|MV_ERROR))
635 if(num_end_markers || error){
636 fprintf(stderr, "concealing errors\n");
637 //printf("type:%d\n", s->pict_type);
638 ff_error_resilience(s);
643 #if 0 //dirty show MVs, we should export the MV tables and write a filter to show them
647 for(mb_y=0; mb_y<s->mb_height; mb_y++){
650 for(mb_x=0; mb_x<s->mb_width; mb_x++){
652 uint8_t *ptr= s->last_picture.data[0];
653 int xy= 1 + mb_x*2 + (mb_y*2 + 1)*(s->mb_width*2 + 2);
654 int mx= (s->motion_val[xy][0]>>1) + x;
655 int my= (s->motion_val[xy][1]>>1) + y;
661 if(mx>=s->width) mx= s->width -1;
662 if(my>=s->height) my= s->height-1;
664 if(ABS(my-y) > max) max= ABS(my-y);
665 /* the ugliest linedrawing routine ... */
666 for(i=0; i<max; i++){
667 int x1= x + (mx-x)*i/max;
668 int y1= y + (my-y)*i/max;
669 ptr[y1*s->linesize + x1]+=100;
671 ptr[y*s->linesize + x]+=100;
672 s->mbskip_table[mb_x + mb_y*s->mb_width]=0;
678 if(s->pict_type==B_TYPE || s->low_delay){
679 *pict= *(AVFrame*)&s->current_picture;
681 *pict= *(AVFrame*)&s->last_picture;
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.data[0] || s->low_delay)
690 *data_size = sizeof(AVFrame);
691 #ifdef PRINT_FRAME_TIME
692 printf("%Ld\n", rdtsc()-time);
694 return get_consumed_bytes(s, buf_size);
697 AVCodec mpeg4_decoder = {
701 sizeof(MpegEncContext),
706 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
709 AVCodec h263_decoder = {
713 sizeof(MpegEncContext),
718 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
721 AVCodec msmpeg4v1_decoder = {
725 sizeof(MpegEncContext),
730 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
733 AVCodec msmpeg4v2_decoder = {
737 sizeof(MpegEncContext),
742 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
745 AVCodec msmpeg4v3_decoder = {
749 sizeof(MpegEncContext),
754 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
757 AVCodec wmv1_decoder = {
761 sizeof(MpegEncContext),
766 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
769 AVCodec wmv2_decoder = {
773 sizeof(MpegEncContext),
778 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
781 AVCodec h263i_decoder = {
785 sizeof(MpegEncContext),
790 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,