fix some exploitable overflows (#994, #997)
static s32 SVC_ReadNal_header_extension(GF_BitStream *bs, SVC_NALUHeader *NalHeader)
{
	gf_bs_read_int(bs, 1); //reserved_one_bits
	NalHeader->idr_pic_flag = gf_bs_read_int(bs, 1); //idr_flag
	NalHeader->priority_id = gf_bs_read_int(bs, 6); //priority_id
	gf_bs_read_int(bs, 1); //no_inter_layer_pred_flag
	NalHeader->dependency_id = gf_bs_read_int(bs, 3); //DependencyId
	NalHeader->quality_id = gf_bs_read_int(bs, 4); //quality_id
	NalHeader->temporal_id = gf_bs_read_int(bs, 3); //temporal_id
	gf_bs_read_int(bs, 1); //use_ref_base_pic_flag
	gf_bs_read_int(bs, 1); //discardable_flag
	gf_bs_read_int(bs, 1); //output_flag
	gf_bs_read_int(bs, 2); //reserved_three_2bits
	return 1;
}

static s32 SVC_ReadNal_header_extension(GF_BitStream *bs, SVC_NALUHeader *NalHeader)
{
	gf_bs_read_int(bs, 1); //reserved_one_bits
	NalHeader->idr_pic_flag = gf_bs_read_int(bs, 1); //idr_flag
	NalHeader->priority_id = gf_bs_read_int(bs, 6); //priority_id
	gf_bs_read_int(bs, 1); //no_inter_layer_pred_flag
	NalHeader->dependency_id = gf_bs_read_int(bs, 3); //DependencyId
	NalHeader->quality_id = gf_bs_read_int(bs, 4); //quality_id
	NalHeader->temporal_id = gf_bs_read_int(bs, 3); //temporal_id
	gf_bs_read_int(bs, 1); //use_ref_base_pic_flag
	gf_bs_read_int(bs, 1); //discardable_flag
	gf_bs_read_int(bs, 1); //output_flag
	gf_bs_read_int(bs, 2); //reserved_three_2bits
	return 1;
}
