+#endif
+
+#if CONFIG_H264_DEMUXER
+static int h264_probe(AVProbeData *p)
+{
+ uint32_t code= -1;
+ int sps=0, pps=0, idr=0, res=0, sli=0;
+ int i;
+
+ for(i=0; i<p->buf_size; i++){
+ code = (code<<8) + p->buf[i];
+ if ((code & 0xffffff00) == 0x100) {
+ int ref_idc= (code>>5)&3;
+ int type = code & 0x1F;
+ static const int8_t ref_zero[32]={
+ 2, 0, 0, 0, 0,-1, 1,-1,
+ -1, 1, 1, 1, 1,-1, 2, 2,
+ 2, 2, 2, 0, 2, 2, 2, 2,
+ 2, 2, 2, 2, 2, 2, 2, 2
+ };
+
+ if(code & 0x80) //forbidden bit
+ return 0;
+
+ if(ref_zero[type] == 1 && ref_idc)
+ return 0;
+ if(ref_zero[type] ==-1 && !ref_idc)
+ return 0;
+ if(ref_zero[type] == 2)
+ res++;
+
+ switch(type){
+ case 1: sli++; break;
+ case 5: idr++; break;
+ case 7:
+ if(p->buf[i+2]&0x0F)
+ return 0;
+ sps++;
+ break;
+ case 8: pps++; break;
+ }
+ }
+ }
+ if(sps && pps && (idr||sli>3) && res<(sps+pps+idr))
+ return AVPROBE_SCORE_MAX/2+1; // +1 for .mpg
+ return 0;
+}
+#endif