The relevent extract of the iso 13818-2 about the value of the syntaxical
element top_field_first of the Picture Coding Extension is:
"top_field_first -- The meaning of this element depends upon picture_structure,
progressive_sequence and repeat_first_field.
[...]
In a field picture top_field_first shall have the value '0', and the only field
output by the decoding process is the decoded field picture."
Originally committed as revision 24853 to svn://svn.ffmpeg.org/ffmpeg/trunk
return -1;
s->current_picture_ptr= pic;
- s->current_picture_ptr->top_field_first= s->top_field_first; //FIXME use only the vars from current_pic
+ //FIXME use only the vars from current_pic
+ if(s->codec_id == CODEC_ID_MPEG1VIDEO || s->codec_id == CODEC_ID_MPEG2VIDEO) {
+ if(s->picture_structure == PICT_FRAME)
+ s->current_picture_ptr->top_field_first= s->top_field_first;
+ else
+ s->current_picture_ptr->top_field_first= (s->picture_structure == PICT_TOP_FIELD) == s->first_field;
+ } else
+ s->current_picture_ptr->top_field_first= s->top_field_first;
s->current_picture_ptr->interlaced_frame= !s->progressive_frame && !s->progressive_sequence;
}