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ivf: make sure it IS a proper AVC decoder configuration record

--- a/ivf.c

+++ b/ivf.c

@@ -98,13 +98,19 @@

 			if(ctx->codec.priv.sz > 0){

 				if(ctx->fmt != FmtAvc1){

-					werrstr("no idea what to do with codec private data");

+					werrstr("no idea what to do with codec private data for non-AVC1");

 					goto err;

 				}

 				x = ctx->codec.priv.data;

-				/* FIXME make sure it's actually a proper AVC decoder configuration record */

-				/* FIXME nal unit length: might not be 4 at all times */

+				if(x[0] != 1){

+					werrstr("avc config: invalid version %d", x[0]);

+					goto err;

+				}

+				if((x[4] & 3) != 3){

+					werrstr("avc config: NAL size %d not implemented", (x[4] & 3)+1);

+					goto err;

+				}

 				/* sps */

 				x[0] = 0;

 				x[1] = 0;