static int y4m_parse_tags()

in libvmaf/tools/y4m_input.c [78:137]

• 53 lines of code
• 23 McCabe index (conditional complexity)

static int y4m_parse_tags(y4m_input *_y4m,char *_tags){
  int   got_w;
  int   got_h;
  int   got_fps;
  int   got_interlace;
  int   got_par;
  int   got_chroma;
  char *p;
  char *q;
  got_w=got_h=got_fps=got_interlace=got_par=got_chroma=0;
  for(p=_tags;;p=q){
    /*Skip any leading spaces.*/
    while(*p==' ')p++;
    /*If that's all we have, stop.*/
    if(p[0]=='\0')break;
    /*Find the end of this tag.*/
    for(q=p+1;*q!='\0'&&*q!=' ';q++);
    /*Process the tag.*/
    switch(p[0]){
      case 'W':{
        if(sscanf(p+1,"%d",&_y4m->pic_w)!=1)return -1;
        got_w=1;
      }break;
      case 'H':{
        if(sscanf(p+1,"%d",&_y4m->pic_h)!=1)return -1;
        got_h=1;
      }break;
      case 'F':{
        if(sscanf(p+1,"%d:%d",&_y4m->fps_n,&_y4m->fps_d)!=2){
          return -1;
        }
        got_fps=1;
      }break;
      case 'I':{
        _y4m->interlace=p[1];
        got_interlace=1;
      }break;
      case 'A':{
        if(sscanf(p+1,"%d:%d",&_y4m->par_n,&_y4m->par_d)!=2){
          return -1;
        }
        got_par=1;
      }break;
      case 'C':{
        if(q-p>16)return -1;
        memcpy(_y4m->chroma_type,p+1,q-p-1);
        _y4m->chroma_type[q-p-1]='\0';
        got_chroma=1;
      }break;
      /*Ignore unknown tags.*/
    }
  }
  if(!got_w||!got_h||!got_fps)return -1;
  if(!got_interlace)_y4m->interlace='?';
  if(!got_par)_y4m->par_n=_y4m->par_d=0;
  /*Chroma-type is not specified in older files, e.g., those generated by
     mplayer.*/
  if(!got_chroma)strcpy(_y4m->chroma_type,"420");
  return 0;
}